20240806IPC to Staff 31(b) Attachment 2 RFB Contruction - Addendums - Combined.pdf

Oxbow Hatchery Renovation Construction Project
2021 Construction-RFP
The purpose of Question and Answer Document is to provide a response to the questions that were received as part of this request for bid.
Below are the questions and answers in response to an inquiry submitted via PowerAdvocate.
Please acknowledge receipt of this Question and Answer Document as part of your Proposal. Failure to do so may subject respondent to is qualification.You can acknowledge receipt in your proposal cover letter and or within the proposal itself.
Question# Date Reference Question Response Response Addendum#
Submitted Date
3/10 C 5,Note 3 states that all piping under slabs shall be encased
per the standard details.Shall this include process piping only and Encase all piping,domestic and process,under the building slabs.Process and drain
1 Feb-23-2021 Scope not domestic plumbing?Does this include the piping under the Mar-12-2021 2
p g. p p g piping under the raceways shall also be encased.
raceways?
10 C 5,calls for 300/GC-5 at each well location.It appears that Only two well vaults(Detail 300/GC-5)are required.The well casings are existing,
2 Feb-23-2021 Scope there are only 2ea and not 3ea as indicated,please confirm.Please Mar-12-2021 but will require a new flange be welded onto the top for connection as shown in the 2
confirm each well casing is existing. detail.
3 Feb-23-2021 Scope 10 C 5,please provide a specification and detail for the sewer lift Mar-12-2021 See Specification 11076 provided in the Bid Documents 2
station.
Route each section of 4-in.perforated drain pipe(along each section of retaining
4 Feb-23-2021 Scope Mar-12-2021 wall)to a single low-point and discharge the collected water through a tee that 2
passes through the retaining wall,directly to the down-slope side.Cover the end of
10 C 8,where do the perforated drain tiles between retaining walls drain drain pipe with filter fabric secured with stainless steel band.
to?
Special Conditions,Item 2b,will the Building Permit and Floodplain IPC is currently working with Baker County to procure the Floodplain Development
Development be ready to be pulled immediately following the bid? Permit. Contractor will be responsible for prcureing and paying for the building
5 Feb-23-2021 Special Conditions Mar-12-2021 permits,electrical,mechanical and other permits required for building the project. 2
fl the contractor responsible for paying the building permit and (Note:IPC is also responsible for the 404 permit,FERC Clearance and Cultural
oodplain development permit fees?
Clearance,which are ongoing.)
6 Feb-23-2021 Schdule of Values Where in the schedule of values do we include the irrigation tank Mar-12-2021 See Updated Schedule of Values 2
replacement
Has preliminary approval of the 404-permit been achieved?Can No approval has bee achieved for the 404 permit. The US Army Corps of Engineers
any comments by the AHJ be provided to the Contract for bidding? will the be governing agency and it is anticipated that we will be required to
7 Feb-23-2021 Permits Mar-12-2021 2
maintain 401 Water Quality Certification requirements and work in specified work
windows for sensitive species considerations.
Are as-builts of the existing facilities available?
8 Feb-23-2021 Scope Feb-26-2021 Yes.Attached to adendum Ol. 1
The specifications require mock-ups of major equipment like the
crowders and incubators prior to releasing them to fabrication. This The mock-ups are required for all equipment listed in Specification 01345,Section
9 Feb-23-2021 Schedule will likely make the lead times exceed the needed delivery dates. Is Mar-12-2021 3.2.The Contractor shall plan their schedule accordingly to meet the mandatory 2
it acceptable to forego the mockups if the duration extends past milestones provided.
mandatory milestones?
Both.The units will be visually inspected for quality(clean welds,no scaling or
10 Feb-23-2021 Schedule If full scale mockups are required,is the expectation to achieve a Mar-12-2021 rusting,proper coatings,acceptable tolerances,etc.).The mockups will also be 2
visual inspection or an operational inspection? operationally tested as required by Specification 01345,Section 1.2 H 1 and 2.
Has the building permit and flood plain permit applications been Building Permit will be the responsibility of the contractor. IPC will provide the
11 Feb-23-2021 Permits submitted? Mar-12-2021 2
Floodplain Development Permit once it has been obtained.
Will the demo(scrap)metals that Idaho Power wants retained be
12 Feb-23-2021 Recycling shipped back to the Franklin storage yard by Idaho Power? Mar-12-2021 IPC will provide the container and shipping to and from Oxbow and the recycle yard. 2
13 Feb-23-2021 Scope Who is responsible for providing and paying for Programing? Mar-12-2021 Contractor will be responsible for providing and paying for all programming. 2
P P P 9 P Y 9 P 9 9�

14 Feb-23-2021 What SCADA software should the Contractor include in their bid? Mar-12-2021 Wonderware(now Aveva) 2
60 A 1.1,Incubation Room 110 calls for Keynote 1 on the ceiling,
acrylic finish over fiber reinforced stucco over%"cement board,is Yes,this is the correct ceiling finish for the Incubation Room.The ceiling shall be
15 Feb-23-2021 Scope this the correct ceiling finish for this room?If so,how shall it be Mar-12-2021 finished to within''/:"of all penetrating items,and the gap shall be filled with a 2
finished at the support pipe header rack penetrations? sealant that matches the finish and provide 100%vaporproof barrier.
The mechanical drawings have several fabricated steel pipe callouts
(many on Sheet 30 M 1 and 2).,of which call out Group(1)for pipe
material,which per the Piping Material Schedule on Sheet GM2
defines(1)as Steel pipe,with fusion bonded epoxy lined and Material type 1(SCH 40 steel)was intended for all piping at the aeration tower,
coated.Is the intention to have fusion bonded epoxy on these furnished with an epoxy lining and coating.Material type 4 is AWWA fabricated
16 Feb-14-2021 Scope/Drawings systems?Should Group(4)be specified for the steel piping?Group Mar-12-2021 2
steel pipe with a LifeLast DuraShield lining and coating per Specification 15063,
(4)includes the typical coating/lining for these types of systems. Section 2.11',and is not intended for use at the aeration tower.
Please confirm pipe type callouts on mechanical drawings for
fabricated steel piping are accurate and as intended.
Plan sheet 30 M 2 references routing 6 each F(formalin)lines.
Please provide more information.Where do they originate,where/ A single 6-in.diameter SCH 40 PVC conduit pipe is routed from the formalin room in
how do they terminate? the sorting and spawning building(50 M 14)to the aeration tower.Within that
17 Feb-14-2021 Scope Mar-12-2021 conduit pipe,a length of%-in.diameter vinyl tubing shall run from the formalin 2
room to each of the corresponding six raceway distribution boxes at the aeration
tower.One tube should be secured to the interior of each raceway distribution box.
Plan sheet 40 M 2 reference the TT(transfer tubes)please provide a
detail of the concrete wall penetrations for the transfer tubes at the Details for the transfer tube penetration on the west side of the structure are
east and west sides of the structure. provided in Section A/40 M 2 and Detail 1/40 M 3.On the east side of the structure,
18 Feb-14-2021 Scope Mar-12-2021 the transfer tubes that deliver fish to each raceway should be directly cast into the 2
raceway walls as called for on 50 M 3.Additional details have also been provided for
the transfer tube penetrations through the masonry Sorting and Spawning Building
and the truck transfer tube piping in the attached drawings.
Please provide a detail of how the river intake pump manifolds The pump-can includes an integral sole plate at the top that shall be mounted to
terminate at the top?Is the pump a flanged connection to the pump
can?Or,is the pump bolted to an equipment pad? cast-in-place anchors(size provided by the pump manufacturer)in the concrete
equipment pad located on top of the intake pump station deck as shown on 20 M 1.
19 Feb-14-2021 Scope Mar-12-2021 The connection between the pump discharge head base plate and pump can/sole 2
plate shall be achieved by a flanged connection with tapped holes in the sole plate.
Final design and details to be submitted by equipment manufacturer for approval by
engineer.
The 24"SW pump discharge is steel,and the yard pipe for the 24"
SW is C-900.Where is the transition from material types and how is The transition shall occur just upstream of the 45°Elbow at coordinate Al(See
20 Feb-14-2021 Scope this transition made? Mar-12-2021 sheet 10 C 6).Use a restrained sleeve coupling adaptor to transition from plain end 2
steel to C900/905.
Detail 213/GC-2 is missing from the plan set,it was referenced on
sheet 10 C 5.Please provide detail. The detail is meant to reference a Cleanout to Grade(COTG).The detail is included
21 Feb-26-2021 Scope/Drawings Mar-12-2021 here for reference.On 10 C 6,change the detail callout"242/GC-3"to reference the 2
new COTG detail"213/GC-2".
Sheet 10 S 4 is missing from the plan set,it was referenced on The reference should refer to the new dorm building foundation.Change the
22 Feb-26-2021 Scope/Drawings sheet 10 C 1.Please provide missing sheet or provide a different Mar-12-2021 2
call out. reference to Sheet 10 S 3.
Drawing 10 C 8 note#3 States place riprap along the toe of the
retaining wall along the Snake River and Pine Creek as shown.There Riprap should be placed at a minimum of 3'deep and extend 6'from the face of the
23 Feb-26-2021 Scope/Drawings does not appear to be any detail showing riprap along the retaining Mar-12-2021 retaining wall along the Snake River and Pine Creek.Riprap is not needed along the 2
wall,and there is not specification for riprap.Please provide details southern retaining wall(Sections A through D).Modify Specification 02200 as
for riprap placement. described in the SPECIFICATION section attached.

Specification 02200 2.1 Re-use of on-site materials,states that there
is a substantial quantity of material near Brownlee Reservoir that
may be used in the construction of permanent features.
a.Please provide gradation,proctor and moisture content test
reports.If reports are not available should bidders assume the IPC has dicovered a discrepancy about the material at the toe of Brownlee Dam.
material is acceptable for bidding purposes.If acceptable,for which Originally,IPC suggested that this material could be used for 3/4"road mix.
24 Feb-26-2021 Scope/Specifications specified material types will it be acceptable? Mar-12-2021 Currently,IPC is waiting for verification about access and hauling requirements and 2
restrictions due to other projects at Brownlee Dam. As such,bidders shall assume
b.Is there an existing access road to the materials at Brownlee the material in question at the toe of Brownlee is not available for this project.
Reservoir that is suitable for trucking and equipment to load out the
materials and haul to the job site?Where is the access road
located?
Refer to specification section 03310 2.9 B.3.Fly Ash.Is the 25%fly The specified fly ash quantity was done to control the potential for ASR.If the batch
ash requirement considered to be a maximum replacement plant has familiarity with a proposed mix design,and recent testing data on the
percentage?Will mix designs with less than 25%fly ash be aggregate source to confirm that the aggregate is not reactive(meets section 03310
25 Feb-26-2021 Scope/Specifications considered for the project? Mar-12-2021 3.1.13.3),less than 25%fly ash will be considered.If an alternative mix design is 2
proposed,the Contractor should submit a list of ITO projects where the exact mix
design has been approved and used,and aggregate test results from within the last
2 years.
Refer to specification section 03310 3.1 B.2.Shrinkage Limitation.
Does this specification section apply to all concrete placed on the
26 Feb-26-2021 Scope/Specifications project,or is it specifically required for hydraulic structures? Mar-12-2021 This limitation applies to all concrete placed on the project. 2
Is water for site work and dust control to be made available to the
27 Feb-26-2021 Site contractor from an onsite source by Idaho Power? Mar-12-2021 Yes.There is currently a truck fill station on site that is available for use. 2
Should it be assumed that detail C244/GC-4 applies to the 36"Drain Yes—Detail C244/GC-4 should be followed for the outfall of the 36"drain line,no
28 Mar-01-2021 Scope line that extends to the Snake River?Is there supposed to be a grate Mar-12-2021 backflow valve or screen is required.The detail also applies to the 12"storm drain 2
or a backflow valve at the discharge end of the pipe? outfall.See the SPECIFICATION section below for riprap details.
Will you accept a Chief Pre-Engineered Steel Building for the
29 Mar-01-2021 Scope raceway structure? Mar-12-2021 If the other requirements of Specification 13121 can be met,this manufacturer is 2
acceptable.
What is the final finish floor elevation for the Airburst BLDG?
30 Mar-01-2021 Scope Mar-12-2021 1,704.70'per 10 C 4. 2
Workstation Desk in lobby 101 H38292LNS has drawers on one side
31 Mar-01-2021 Scope — Mar-12-2021 Yes. 2
is this correct?
Office desk#102 H38L66NSL is not a HON part number. The 66" Model should be H38L6630NSL,as noted in the finish schedule.This model includes
32 Mar-01-2021 Scope desk and return—is the return on the left or right side? Is the return Mar-12-2021 2
g the base desk with a right return.
The HON spec for the office chairs is W40. Are you really asking for
33 Mar-01-2021 Scope WP40 which is a black vinyl chair? Mar-12-2021 Yes,please change the model number to HIWM2.A.H.M.WP40.T.5B. 2
Is Idaho Power providing and asbestos and lead paint survey for
34 Mar-01-2021 Scope demolition of the existing hatchery building or it the responsibility Mar-12-2021 Yes. A Report is being generated currently. Preliminary results show 2
of the contractor to provide as part of their bid?
Will Idaho Power be moving all contents from the existing hatchery IPC will make arrangements to remove and store most contents from the existing
building? hatchery building for later use. Contractor is required to remove retain and reuse
35 Mar-01-2021 Scope Mar-12-2021 2
the existing incubation equipment that is to be transferred to the new Hatchery
Building

Does the pre-engineered steel building structure over the new Specification 13121,Section 2.3.A call out"Roof Liner Panel",which is referring to
36 Mar-01-2021 Scope raceway get a liner panel under the entire roof? Mar-12-2021 the standing seam metal roof.The entire roof of the pre-engineered building shall 2
be covered with standing seam metal panels.
Is the contractor installing the pre-engineered steel building require
37 Mar-01-2021 Scope to hire and independent inspector for testing the structure? Mar-12-2021 Yes,per the requirements of Specification 13121,Section 2.6.A. 2
Overhead power that is currently over the existing Chinook
raceways are not shown to be demolished and relocated on sheet Mar-12-2021 IPC is currently working on relocating the overhead power line that is over the 2
38 Mar-02-2021 Scope 10E2.It appears this line will have to be relocated to construct the Chinook Raceways. It is planned that this will be done in in April.
new Adult Holding Facility.
The drawings indicate a 4"grout pad on top of the East Raceway The finished floor of the cross crowder channel shall be a 4"grout layer as shown in
39 Mar-02-2021 Scope slab.Please confirm if 4"of grout is to be placed on top of the entire Mar-12-2021 Detail 1/40 S 4.This is to allow for adequate drainage with precision contouring that 2
length and width of the East Raceway slab would be difficult with a mass concrete placement.
In reviewing the Historical Utility Site Plan provided in addendum
#1,the overhead power to be demolished that runs to the
northwest corner of the existing holding ponds suggests this is the IPC will have this power relocated to a temporary underground feed. Power must
40 Mar-02-2021 Scope power supply to the existing crowders.Is the contractor to relocate Mar-12-2021 2
this power supply to the existing crowder and aeration pumps?If be maintained Burring construction.
we are to supply power to existing crowder and pumps,when is this
work to be done and what route should be taken
Fiber optic/Phone lines are indicated to run under the new Hatchery If sequencing does not allow for utility routing shown. Contractor will have the
41 Mar-02-2021 Scope Building to the existing Hatchery Building.Are these to remain in the Mar-12-2021 2
current location option to rerout the utilities in question.
In volume 1 sheet GI 5 the Crowder network diagram shows several Drawing GI 5 provides a general network diagram for crowder communications.The
items such as PLC,VSDs and network switch in each panel. I volume Contractor is responsbile for determining,furnishing,and testing the equipment
2 sheet 40 110 the typical panel layout does not itemize any of necessary to achieve a fully functional system based on this diagram.
42 Mar-02-2021 Scope those items in the Bill of Materials. It appears that information is Mar-24-2021 3
missing from the Bill of Materials for those panels. Do you have any As stated in specification 11425,the crowder drawings and specifications are
additional information about those panels and what needs conceptual in nature,and a single systems integrator shall be responsible for
quoted completing final design,fabrication,and testing of the crowders and associated
systems to show that they meet the stated design requirements.
The Air Burst Control Panel is existing and shall be connected to'INT-RIO'
There are two panels that are listed in Volume 1 on sheet GI 4,Air DISTRIBUTED 1/0 PANEL as shown on GI 4.On 20 12,change"(E)Chiller Control
Burst Control Panel in Area 20 and Chiller Control Panel in Area 60 Panel"to"(E)Air Burst Control Panel".
43 Mar-02-2021 Scope Mar-24-2021 3
that are not listed in any other drawings. Do we need to provide a The Chiller Control Panel shall be furnished as part of a packaged system from the
bid for these panels? chiller manufacturer.It is new and shall be part of the Contractor's bid.As shown on
GI 4,connect the Chiller Control Panel to'OXB-CCP'CONTROL PANEL.
There are some additional items on the Process Network diagram
(Vol 15heet GI 4)that are not detailed in any layout drawings. Do Network Diagram shows basic infrastructure for CCTV and LAN.VFD's are shown in
44 Mar-02-2021 Scope you have more information on the following-CCTV Control Mar-24-2021 3
Station/DVR(Area 50),8 VFDs(Area 50),Local Access Network their respective areas on Electrical and Controls plans and Division 16 Specifications.
Patch Panel at TTB(Area 60),6 VFDs(Area 60)

After a review of the contract documents it is still unclear whether
IPC will directly contract or execute the SCADA programming or if it
is to be sub-contracted under the contractor scope of work.Per Contractor to provide programming for all systems and shall be included in the
Exhibit C—Special Conditions SC-2 General Scope of Work A and B it instruments and controls package that is identified in each Area of the SOV. If
45 Mar-03-2021 Scope is not identified.Per Division 13 spec section 13440 1.1 D 1-5 it is Mar-12-2021 Contractor would prefer to show the entire SCADA programming as a stand alone 2
still vague if the PROGRAMMER is a sub to the general or to the item,it can be shown as an additional line item. Please indicate as such in the
owner.Furthermore,it is not identified as a special line item in the narrative.
schedule of values.Is the SCADA programming under the owner's
supply and only for us to coordinate and schedule with?
Reference:Drawing 50-M-2&50-M-9,Question:Drawing 50-M-2
indicates that the SW supply from the aeration tower to the fish lift The SW pipe that delivers water to the false weir should be an 8"diameter pipe.The
system false weir is to be a 6"pipe whereas 50-M-9 Plan and pipe is run in C900 from the tee(Coordinate C3 on 10 C 5)to the sleeve coupling
46 Mar-03-2021 Scope Mar-24-2021 3
Section A indicate this pipe to be an 8"304 stainless line.Please upstream of the valve vault on 50 M 2 where it will transition to stainless steel(pipe
confirm the correct sizing and material type/transitions from the type 7)with a sleeve coupling adaptor.
valve vault to the false weir connection.
Sheet 10 C 8 shows retaining wall details for the site perimeter.
Detail A and B call out 12"thick 4"-6"quarry spalls up the face of The Quarry Spalls are called out due to the local availability. These are intended to
47 Mar-04-2021 Scope Mar-12-2021 provide drainage.If Contractor would like to propose an alternative to the detail 2
the wall.Is this correct or should this material be a smaller gradation shown,please indicate as such in the narrative.
drain rock?
Reference Plan Sheet 50 M 8-the lodaphor system states pipe type The pipe type was inteded to be Polyvinylidene Fluoride(PVDF),SCH 80 with Heat
48 Mar-04-2021 Scope of LLDPE,system 17,which does not appear to be in the pipe Mar-24-2021 fused fittings and stainless valves.Stainless Steel piping and fittings are an 3
schedule.Would Stainless Steel pipe,fittings and valves be acceptable alternative for this system.
acceptable for this system.
Reference plan sheet 50 M 2,in the 9'L x 5'vault there is reference See Question 46 for the answer to the pipe size question.
to a 6"BFV,V-40.2 This does not match the valve schedule.Plan
sheet 50 M 9 has this SW line as 8".Which is correct?The 12"BFV Section A on 50 M 9 shows the 12"pipe terminating at the inside face of wall.This
49 Mar-04-2021 Scope in the vault is numbered V-40.1,this does not match the valve Mar-24-2021 pipe and any other pipes that penetrate concrete walls shall have a seep ring as shown
schedule?The 12"SW from the vault terminates at the fish lifting shown on detail M203 sheet GM-5.
system,50 M 9.How does the 12"SW terminate at the fish lifting The valves are mis-tabled on G4 and 50M2.The valves should reference V-50.31 and
station? V-50.32 in the valve schedule on GM-3.Change V-50.32 to an 8"diameter valve.
In the adult raceways the 12"TT pipe spans 10'.What is expected The pipes will be directly cast into the walls of the raceways at each end and free
50 Mar-24-2021 3
for pipe supports if any? span the 10'dimension.No additional pipe supports are required.

PIlease provide existing facility as-built or record drawings and
indicate year that the existing facility was completed include any
modifications or remodel work.
51 Mar-09-2021 Scope/Drawings a.®lease provide existing bottom of slab elevation for the Mar-12-2021 See Addendum 01 2
following:
i.Abandoned Raceways
nZall Chinook Raceways
iii.Adult Holding Ponds
52 Mar-09-2021 Scope/Specifications Will the'PROGRAMMER'as defined in Spec Section 13440 be Mar-12-2021 Contractor shall provide the programmer 2
contracted by the OWNER?
Will the dormitory resident(s)be living in the dorm while it is moved
53 Mar-09-2021 Scope for foundation work?Will we need to temporarily connect septic, Mar-24-2021 No,The dorm will re emptied by ro or y prior to moving. No temporary utilities 2
or housing will be required to be providedd b by contractor.
power,and water,or provide an alternate temporary facility?
Will equipment,materials,and trailers be moved from the
54 Mar-09-2021 Materials/Equipment contractor staging area on the south side of the project prior to Mar-12-2021 Possibly. IPC will accommodate some material relocation from the laydown area, 2
however there is not currently a plan to relocate the items in question.
construction start?
As per GC-33.3,hazardous materials were brought up at the site
visit,is IPC aware of any known hazardous materials,such as
asbestos or lead on the project site?
55 Mar-09-2021 Hazmat Mar-24-2021 Please see report from Industrial Hygiene Resources 3
a. Oregon state law requires a demolition permit for all structures,
has IPC procured the demolition permit?The demolition permit
requires an asbestos survey and,if built before 1978,a lead survey,
have these been performed?
Per SC-14 salvage bins will be provided by IPC for the miscellaneous
56 Mar-09-2021 Recycling/Salvage steel demolition.Will hauling of these bins to and from Franklin Mar-12-2021 IPC will provide dump bins(-20 cubic yards)as necessary for misc.steel demo. 2
Road be performed by IPC or the contractor? Please provide These bins will be dropped on site at Oxbow Hatchery and picked up by IPC.
dimensions of these bins to properly estimate the steel demolition.
Sheet 10 C 8,Note 3 references placing rip rap along Snake River Riprap should be placed at a minimum of 3'deep and extend 6'from the face of the
57 Mar-09-2021 Scope and Pine Creek'as shown',please identify where the rip rap detail is Mar-12-2021 retaining wall along the Snake River and Pine Creek.Riprap is not needed along the 2
located.Also,please provide detail showing replacement of rip rap southern retaining wall(Sections A through D).Modify Specification 02200 as
with native fill at southern side and the extents of placement. described in the SPECIFICATION section attached.

Media provider Jaeger Tri-Packs are not available in I%"size for the
Surface Water Aerator,this was discontinued 10 years ago
58 Mar-09-2021 Scope according to a supplier. The options are 1",2"and 3%"offered by Mar-24-2021 2"Jaeger Tri-Pack media is acceptable for the surface water bulk aerator. 3
Jaeger.Please specify which size for the Surface Water Aerator
media.
Reference plan sheets 10 C 6 and 20 M 1-4.The SS CA line is called
59 Mar-09-2021 Scope out as 4"and 6"on various plan sheets.Is the line only 4",or does it Mar-24-2021 The SS CA line shall be 4"everywhere.The callout on Section A/20M4 shall be 4". 3
change somewhere?
Sheet GC-3,Detail C240 and Detail C241 show catch basin and The catch basin may be precast and meet meet the size and elevations provided on
manhole details.Would it be acceptable to provide precast storm the drawings.Precast structures will be reviewed at shop drawing time.
60 Mar-09-2021 Scope structures?In addition,the manholes are designated as 96" Mar-24-2021 3
Diameter,which appears very large for the size of pipe penetrations A 72"diameter manhole is allowable at MH-3,6 and 7.A 96"diameter manhole is
at each manhole.Please advise if manhole size of 96"is correct and required at the other locations due to the multiple penetrations and hole sizes at
typical for all manhole locations. those manholes
61 Mar-09-2021 Scope Reference plan sheets 10 C 5 and 60 M 5,where does the 4" Mar-12-2021 Pumped ground water is supplied by existing wells#1 and #2,which feed to the 2
Pumped Ground Water originate?Out of the Hatchery Building? aeration tower.
Reference plan sheet 10 C 5,the 2"PW(plant water)calls for pipe
62 Mar-09-2021 Scope system(21).The pipe schedule has system 21 as double contained Mar-12-2021 PW is potable water that is fed from the domestic well. Double walled pipe is called 2
fusion pipe,Asahi Chem Prolock,butt fusion.Please advise if this out due to the potable water line being within the same areas of process water.
pipe material is intended for the 2"plant water buried piping.
Plan sheet 10 C-5 references detail C-300 on GC-5,and Says typical
63 Mar-09-2021 Scope of 3.We find only 2 water wells with manhole..If there is a third Mar-12-2021 There are 3 wells o ground
d water wells.(including the domestic well). However the detail only 2
well and manhole,where is it located? applies to the two groun
Addendum 1 includes a specification for drilled piles.Will driven
64 Mar-09-2021 Scope a contractor would like to propose en alternative to the drilled piles,please indicate
p piles be acceptable as originally specified if preferred by the Mar-12-2021 as such in an alternative for value engineering. 2
Contractor?
Overhead power that is currently over the existing Chinook
65 Mar-10-2021 Scope raceways are not shown to be demolished and relocated on sheet Mar-12-2021 IPC is currently working on relocating this overhead powerline. 2
10E2.It appears this line will have to be relocated to construct the
new Adult Holding Facility.
66 Mar-10-2021 Scope Can the roof panels for the raceway structure be changed to 16" Mar-12-2021 Please provide as an alternative for value engineering. 2
wide-24 ga?

01660-3.3-C requires that a leakage test is passed prior to the 14-
All pipes shall be leak tested per the requirements outlined in the fluid service
67 Mar-10-2021 Scope day continuous run test.Please provide the requirements of leak Mar-24-2021 schedule on GM-2.To complete the table,GWP,SWP and TT piping shall have a 3
testing.What structures require leak testing?What is the leak type"(A)"leakage allowance,and the TT piping shall be tested per Note 6.
testing method and duration? yp g p p g
03310-3.17 requires wet curing for concrete that buried or
backfilled.Is it acceptable to chemical cure all the walls and slabs
instead of wet curing?Due to the time of year when some of this Alternatives to wet curing will be considered based on time of year and temperature.
68 Mar-10-2021 Scope Mar-12-2021 Curing compounds will be considered for certain applications that do not expose a 2
concrete work is taking place,wet curing may cause the concrete to biohazard to the fish culture.
freeze.Can curing compound remain on the exposed concrete or is
to be blasted off?
01345-3.2-A.1 requires a mock-up for each internal and external
69 Mar-10-2021 Scope wall type for all buildings.Can the mock-ups be foregone for Mar-12-2021 Contractor shall plan on mock-ups as specified. Alternatives will be considered on a 2
product samples?The difficulty for preparing over 10ea case by case basis.
independent mock-ups seems erroneous.
01345-3.2-2&3 requires'complete functional testing'for the
The requirement for complete functional testing of the mockups shall remain as
crowder mock-ups prior to fabricating the rest of the units.To specified.This test shall demonstrate that the mockups meet all specified
perform a complete functional test of the crowders,the LCP's,VFD's
and PLC's need to setup,installed and tested as well as the requirements,including foward and reverse travel,up and down fence movement,
70 Mar-10-2021 Scope programming software for running through all of the commands. Mar-24-2021 and fully functional onboard power and controls.The functionality described in 3
11425 paragraph 2.5.G,items 3 through 5 is not required for initial mockup testing,
Setting up temporary provisions for this mock-up test would be time as these items require wireless communication with the hatchery's main SCADA
consuming and expensive.Can the mock-up requirement be
reduced to a visual inspection only? system.
The diffuser box shown on 4056 may be cast-in-place with a waterstop along the
10/S-6 calls for'Precast Diffuser Boxes',can this box be cast-in- slab/wall interface.Reinforcing shall follow the standard details provided in the
71 Mar-10-2021 Scope place?If so,should there be PVC bulb waterstop between the Mar-24-2021 general details and shall be reviewed by the Engineer with the shop drawings.The 3
slab/wall intersection?What is the piping penetration detail at the supply and drain pipes at the invert of the diffuser box terminate at the inside face
bottom of these boxes? of concrete and shall include a seep ring through the slab as shown on Drawing
40M4.
a.See plans and instrument schedules
Flowmeters:
a.MCompact or remote transmitter? b.Sensor to transmitter lengths vary,field verify prior to ordering.
72 Mar-10-2021 Scope b.Dlf remote,what is the cable length from sensor to transmitter? Mar-24-2021 3
c.DElectrode material?316 ss,Hastelloy C c.See Specification 13441,Section 2.2 C
d.OLiner material?PTFE,Natural rubber,polyurethane
e.DOutput?4-20 mA,ethernet IP d.Natural rubber liner
e.Sensor output per Specification 13441,Section 2.2 E
Raceway Gate Actuators: a)See 40M5 Note 1
73 Mar-10-2021 Scope a.M/hat is the torque requirement? Mar-24-2021 b)See 40M5 Note 3 3
b.What is the stem dimension?
c.@ there a mounting pad?
c)The actuator shall be mounted to the concrete raceway as shown on 40M5.
Raceway Level Transmitters:
a.mhe model that was listed by the engineer is being phased out by The programming methods are acceptable provided they can be integrated into the
74 Mar-10-2021 Scope the manufacturer and is being replaced with a new unit.It uses Mar-24-2021 3
different programming methods.We need to get approval from the overall SCADA system as intended.
engineer to use the newer technology.

The cross crowder channel runs north and south along the east side of the new
75 Mar-10-2021 Scope In Area 50,how many cross crowder channels are there? Mar-12-2021 Adult Holding facility. This channel terminates at the interface with Area 50 at the 2
False Wier and EA basket.
There appears to be 6 raceways and 1 cross crowder channel in the
76 Mar-10-2021 Scope General Design Schematic(Vol 1,Sheet G-4)But on the Crowder Mar-12-2021 There are two cross crowder channel crowders due to the need to isolate the fish in 2
Network Diagram there are panels for 6 raceways and 2 cross both the upstream and downsteam directions within the cross crowding channel.
crowder channels(Vol 1,Sheet GI 5)
There are also some additional items on the Process Network
Diagram(Vol 1,Sheet GI 4)that are not detailed in any layout
drawings.Do you have more information on the following Network Diagram shows basic infrastructure for CCTV and LAN.VFD's are shown in
77 Mar-10-2021 Scope a.®CTV Control Station/DVR(Area 50) Mar-24-2021 3
b.8 VFDs(Area 50) their respective areas on Electrical and Controls plans and Division 16 Specifications.
c.Ilocal Access Network Patch Panel at TTB(area 60)
d.®VFDs(Area 60)
14.)Eor the Managers Zone Panel,Dorm Zone Panel and the Shop
78 Mar-10-2021 Scope and Storage Panel?These do not have a BOM,just a few notes on Mar-24-2021 SCADA Software And Hardware,Item 2,Sheet GI 4 specifies the requirements. 3
Sheet GI 4.We need more information on what is to be included.
On the MOXA—AWK-3131A Industrial wireless client-We need a
79 Mar-10-2021 Scope part number or more details on the external antennas,and the Mar-24-2021 These items are to be provided by the IT installer. 3
cables that are to be included.
It appears that information is missing from the Bill of Material for
the following panels
80 Mar-10-2021 Scope a.Eh volume 1 sheet GI 5,the Crowder Network Diagram shows Mar-24-2021 See answer to question 42. 3
several items such as a PLC,VSDs and network switch in each panel.
b.1h Volume 2 sheet 40110,the Typical Crowder Panel Layout does
not itemize any of those items in the Bill of Materials.
There are two panels that are listed in Volume 1 on sheet GI 4,Air
Burst Control Panel(in Area 20)and Chiller Control Panel(Area 60)
81 Mar-10-2021 Scope Mar-24-2021 See answer to question 43. 3
that are not listed in any of the other drawings,can you provide
more information on these panels?
It appears that the restroom,kiosk,and shade structures do not
have any fixtures,furnishings or equipment,is that correct?
82 Mar-10-2021 Scope Mar-12-2021 Yes,this is correct. 2
a.mhere are no plumbing or electrical services to any of these
structures,is that correct?
Theexisting adult holding ponds n matly 10 F1.Fenn with•12"thick
How deep is the existing Adult Holding Facility? •nFmm�.F n .nFn enn.n eF. nF minnn ti Vxn n not provided-
Based on
83 Mar-10-2021 Scope a.�ow thick is the concrete? Mar-24-2021 rn nnn .n � 3
historical drawings,the existing Adult Holding Ponds are approximately 8'deep but
b.®an you provide a structural as-built? will need to be Feld verified.The concrete is 8"thick.

The Ghmn ok raceways are approximately 6 N deep.Thee rete floors aFe
. The fall chinook
raceway start depth is 4.83'.The end depth is 5.33'and the outlet box is 7.33'deep
from the top of wall.The concrete wall thickness varies from 8"to 12".The footing
How deep are the existing raceways scheduled to be demolished? thickness is 12".
84 Mar-10-2021 Scope a.®ow thick is the concrete? Mar-24-2021 2 3
b2an you provide a structural as-built? The Abandoned raceways have a start depth of 4'and an end depth of about 4.34'.
The outlet box is 5.34'deep from the top of wall.The wall thickness is 7 5/8".The
footing thickens is 8".
All dimensions shall be Feld verified.
85 Mar-10-2021 Scope Is the use of slag allowed instead of fly ash? Mar-24-2021 Yes,the use of slag is allowed,provided the proposed mix design and test results 3
are acceptable to the Engineer.
One local concrete supplier is not in the Snake River drainage and as
a result the do not have any alkali Silica reactivity issues,however
86 Mar-10-2021 Scope the short test for ASR almost always shows a false positive test Mar-24-2021 No,the ASR and shrinkage spec can't be removed. 3
result. Can the ASR section be removed as it is impossible for them
to meet the shrinkage spec and the ASR on a remote location that is
2 hours from the batch plant.
Retarder with delayed set may be acceptable,subject to adequate testing,this must
With an addition of Delvo stabilizer as a dosage that results in a 3 include an early test slab placement.The test slab shall be placed at a location
87 Mar-10-2021 Scope hour delayed set,can the spec be changed to a 3 hour from plant to Mar-24-2021 determined by the Engineer. 3
pour versus a 90 minute spec? If the results are found to be satisfactory,the test slab may be integrated into the
project based on Engineer's discretion.
The field shrinkage test that is listed in the specs is a lab test only
88 Mar-10-2021 Scope and is not accurate per the concrete supplier and is not accurate Mar-24-2021 Shrinkage testing is not required for field cure specimens.The shrinkage limitations 3
with a field cure specimen. Can this spec be removed? shall only be verified for trial batch,following requirements of ASTM C157.
Raceway Gate Actuators
89 Mar-10-2021 Scope a.%/hat is the torque requirement? Mar-24-2021 See answer to question 73. 3
b.What is the stem dimension?
c.B there a mounting pad?
Raceway Level Transmitters—The model that was listed by the
engineer is being phased out by the manufacture and is being
90 Mar-10-2021 Scope replaced with a new unit. It used different programming methods. Mar-24-2021 See answer to question 74. 3
We need to get approval from the engineer to use the newer
technology.
In area 60,the chiller room gas monitoring system EF-x1000-T a.Refer to Mechanical drawings for duct sizes
(sheet GI 3)
91 Mar-10-2021 Scope a.What is the size of the duct? Mar-24-2021 b.0-10V 3
b.B it analog or BACnet,RS-485,or Modbus?
c.B analog,is single or dual output needed? c.Single output
92 Mar-10-2021 Scope Are you providing revised plan sheets to reflect the plan changes Mar-24-2021 Updates will be provided in the Conformed Documents for construction. 3
listed in Addendum 01?

Refer to Sanitary Sewer Lift Station Specification 11076,What is the The wet well material shall be concrete or fiberglass.Other materials may be
93 Mar-10-2021 Scope required wet well material?Is concrete acceptable? Mar-24-2021 reviewed during the submittal review process. 3
Sheet GI5 indicates that each Crowder Control Panel is to include a
Platform VFD,Crowder VFD,PLC,Network Switch,and Radio.The
95 Mar-10-2021 Scope Crowder Control Panel Design on sheet 40110 does not include any Mar-24-2021 See answer to question 42. 3
of these devices.Please clarify the design intent for these control
panels.
P&ID sheet G-4 near the Adult Holding Raceways displays V-40.1&
40.2 as motor operated valves with sizes to be unclear,assume 12" V 40.1-V 40.12 shown on GM-3 and 40 M 2 are correct and reference the 4"
butterfly. Sheet 40-1-1&GI-3 for the instrumentation schedule isolation valves on the spray nozzle system.
concur with sheet G-4. However sheet GM-3 for the Valve Schedule
displays valves 40.1&40.12 as 4"butterfly valves and V 40.2 On G-4,GI-3,40 11,and 50 M 2 V-40.1 and V-40.2 shall be changed to V-50.31 and
96 Mar-10-2021 Scope Mar-24-2021 3
through 40.11 as 6"butterfly valves all with 2"manual operator V-50.32 respectfully.See answer to question 49 for final sizes.
nuts. Sheet 40-M-2 Raceway Plan and Details show valves 40.1-
40.12 as 4"butterfly valves without indication of manual or motor Further,on Sheet 50M9,the three 4"diameter buried butterfly valves should
operator. Please clarify the valve sizes and operators for valves 40.1 reference V-50.33,V-50.34,and V-50.35 in the valve schedule.
through 40.12
Area 50(Sheet 50 1 20)—SB-LCP panel—AVEVA—tcnd2U-19ac-LN2C
—Intouch panel PC:compact 19"has been discontinued. The
97 3/12//2021 Scope following are two option. Please advise. Mar-24-2021 Option A with equivalent size touchscreen. 3
a.A PC with a wonderware license
b.01odicon touchscreen(may not be able to get bigger than 15")
98 Mar-12-2021 Scope 2.13 the new intake structure in the exact same location as the Mar-12-2021 The new structure is in the same general location as the old structure. The new 2
existing structure?Are the piles in the exact same locations? piles are not in the same location as the old piles,
The type G aggregate underneath the asphalt is not defined in the
99 Mar-12-2021 Scope Mar-24-2021 See Specification 02513 Section 2.1 Aggregate Base. 3
specifications.Please provide a gradation for this aggregate.
The specifications require an AISC certification for steel
100 Mar-12-2021 Scope/Specifications manufacturers.Can this certification be waived for metal Mar-24-2021 No,the certification can't be waived. 3
fabrications?

The Protective Coatings Spec lists epoxy in Mud Room walls and
101 Mar-12-2021 Scope/Specifications concrete floors,and the room finish schedule list this as penetrating Mar-24-2021 The finish schedule provided on GA-9 is correct for all areas. 3
sealer. Can you confirm which is correct?
102 Mar-12-2012 Scope What areas are to receive penetrating concrete sealer and is there a Mar-24-2021 Penetrating concrete sealer shall be used where noted on the GA-9 finish schedule. 3
manufacture/product specified? Sikagard 740 W or similar can be used as penetrant sealer.
Facts/References:.Sheet G-4 for the P&ID shows valves V 60.9 as an
unknown size near the chiller(assumed in the chiller room),V 60.10
as a 6"butterfly assumed in the Incubation Room,and V 60.11 as a valves thou V-60.3 AND V-60.52 as shown
are 4"diameter isolation and check
8"butterfly assumed in the Incubation Room. •Sheet G-4 also valves around P-60.1 and P-60.2 as shown on 60M4.
shows V 60.10 as being installed on a 6"CGW line where other V-60.4 and V-60.9 are 4"isolation valves on the heat excanger as shown on GH8.
places it is called as an 8"such as sheet 60-M-2.•In contradiction to
103 Mar-12-2021 Scope G-4,Sheet 60-M-2 Section C shows valves V 60.9 as a 6"butterfly Mar-24-2021 V-60.8 is a 4"valve located in the chiller room,just above key note 7 on 60M5. 3
valve and V 60.10 as an 8"butterfly valve in the Incubation Room. V
60.11 is not shown on this sheet.•Sheet GM-3 Valve Schedule lists
V 60.9 as an unknown size butterfly valve in the chiller room,V V-60.10 and V-60.11 are meant to be the isolation/control valves for the chilled and
V 60. as a 6"butterfly in the Incubation Room,and chiller
room,
as V 8" ambient ground water piping.V-60.10 is a 6"diameter valve on the CGW line,and V-
butterfly in the Incubation Room. Please clarify the valve this. is a 8"diameter valve on the GW line.Change the callouts on 60M2 to reflect
locations,sizes,and system installations for valves 60.1 through this.
60.11
Facts/References:-Sheet 60-M-5 Chiller Plan shows 6 pumps(P 60.1
thru 60.6).•Sheet GM-3 Pump Schedule only lists P 60.1&P 60.2 for All pumps shown on GH-8 are required.Schedules for P-60.3 thru P-60.6 are
104 Mar-12-2021 Scope Mar-24-2021 3
the chiller,no other pumps which is contradiction to sheet 60-M-5. provided on GH5.
Please clarify the number of pumps for the chiller system.
Sheet 10E4 is a single line diagram for the Area 10 equipment.Can The single line diagram on 10 E 4 shows electric panels for the entire hatchery,not
105 Mar-12-2021 Scope Mar-24-2021 3
similar single line diagrams be provided for the rest of the facility? just Area 10.See sheet GE 4 for panel schedules.

Sheets 50118 and 50119 provide detailed VFD wiring diagrams for
BRAIL-50.1-VFD,FHT-50.1-VFD,MHT-50.1-VFD,and FBE-50.1-VFD.
Can motor sizes and similar wiring diagrams be provided for the
following VFDs:
•P-10.1&P10.2 VFDs Drawing GM-3 provides sizes for all motors in question.The crowder motors and
106 Mar-12-2021 Scope •P-10.1&P10.2 VFDs Mar-24-2021 VFD details shall be provided by the crowder system integrator/manufacturer.For 3
•Crowder 1-6 Platform VFDs the remaining VFDs,see specification 16265 for VFD wiring and requirements.
•Crowder 1-6 Crowder VFDs
•Cross Crowder 1-2 Platform VFD
s•Cross Crowder 1-2 Crowder VFD
s•P-50.1,P50.2,P50.3&P50.4 VFDs
•P-60.1&P60.2 VFDs
107 Mar-12-2021 Scope Please provide water elevation and flow historical data at or nearby Mar-24-2021 See Addendum 03-Attachment 04-HEC RAS Model 3
the Oxbow intake structure.
At the site visit,the Idaho Power Representative stated that the
108 Mar-12-2021 Permits permit for river intake construction had not yet been approved. Mar-12-2021 Permit will be provided to contractor upon reciept. IPC is in the pre-application 2
phase.
What is the status of the permit?
At the site visit,the Idaho Power Representative stated that the
permit for river intake construction had not yet been approved.Will IPC has not yet finalized the permit for this work. It is IPC's intent to apply for the
109 Mar-12-2021 Permits the permit allow the contractor to install a cofferdam or place Mar-12-2021 permit after the contractor has been selected and the permit application can be 2
temporary fill material into the river below the ordinary high water adjusted based on the needs of the contractors.
line?
Read Section III Requirements&Clarifications,D.Performanceand/or Payment
110 Mar-16-2021 Bonds Is IPC requiring bid bonds for the Oxbow RFB? Mar-16-2021 Bonds of the RFP document and Section 19 of the Project Construction Agreement 3
(last paragraph)

Refer to specification section 11425-5 2.5H.Manufacturers,or
equal:1.Transco Industries,Portland,OR,2.Con-Vey,Roseburg,
OR,3.Jesse Co.,Tacoma,WA.All three listed suppliers have
declined to bid the project.Some suppliers have commented that It is acceptalbe to use alternative manufacturers to those listed in the specifications.
they will have a hard time bidding due to the fact that there is no The manufacturer shall have experience in manufacturing equipment of similar
completed design and they don't handle design.We have other complexity,size and to industrial standards. Alternative designs for the fish
111 Mar-17-2021 fabricators in mind but they may or may not meet your Mar-24-2021 handling equipment that represent significant departures from those described in 3
the Contract Documents are not acceptable. Minor variations that refine the
requirements because the requirements are not listed. equipment will be considered and allowed as long as they represent improvements
-Please provide direction on how to proceed.(what suppliers will and the intended function of the equipment remains intact.
be accepted)
-Will Idaho Power consider alternative designs for the fish handling
equipment?and how should we propose alternative designs?
Refer to Specification 05120 1.2 B"Steel fabricator:Minimum of 5
years'
experience in fabrication of structural steel and shall be certified
under AISC Quality Certification.&a.Use a professional engineer on The AISC Quality Certification cannot waived.
112 Mar-17-2021 fabrication staff."We have reached out to several steel fabricators Mar-24-2021 A professional engineer does not have to be on staff,but shall review and stamp 3
who fabricate products for fish hatcheries and other similar any contractor designed items.
facilities.Many of them do not have AISC certifications.Could this
certification be waived for structural steel fabrication as long as the
drawings are reviewed and stamped by a professional engineer?
Refer to Specification 05120 1.3 A2a"Prepare Shop Drawings under
113 Mar-17-2021 National Institute of Steel Detailing Quality Procedures Program Mar-24-2021 Yes,this requirement can be waived. 3
certification."Can this certification be waived?
The following product is provided as an acceptable standard of quality for acoustical
There is no acoustical panel ceiling or suspended metal grid panel ceilings:
114 Mar-19-2021 specification however it is a required finish on the architectural Mar-24-2021 3
drawings. Armstrong"Cirrus"beveled tegular edge,2'x2'on a 15/16"white grid.Tile color
white,item 584.
Per 05500,2.1,B,please define areas of the project that are The referenced paragraph applies to miscellaneous metalwork,and a"corrosive
considered a'corrosive environment'or'humid environment'as this environment"is defined as a location where the metalwork is submerged or has the
115 Mar-19-2021 Mar-24-2021 ability to be submerged during normal operations.This project does not have any 3
drives the protective coating requirement.Please clarify where areas considered a"humid environment".We note that all structural steel shall be
protective coatings per 09910 will be required. coated per System(4)in Specification 09910.

The following additions, deletions,modifications, or clarifications, along with all attachments shall be
made to the appropriate sections of the Specifications and Contract Documents and shall become a part of
the Contract Documents. Bidders shall acknowledge receipt of this addendum in their proposal.
DRAWINGS:
AM. DRAWING 50 M 3.1
A. REPLACE The Wire rope and hand winch system with an electric chain hoist for lifting of
the stainless steel transfer tube. The chain hoist shall be Harrington model NERO15SD, or
engineer-approved equal.
1) The chain hoist shall have a minimum lifting capacity of 3,000 lbs and shall be
equipped with load brake and motor friction clutch.
2) The chain hoist shall be powered with 3-phase 480 VAC electrical service and shall
be equipped with thermal overload protection.
3) Ingress Protection(IP)rating for chain hoist's enclosure shall be IP55 or better for
protection against water jets from any direction. The chain hoist shall be
designed operate outdoors,in ambient conditions between-4°F and 104T.
4) The chain hoist shall be equipped programmable limit switches to limit the travel
of the transfer tube during normal operation. An additional mechanical stop
assembly shall also be installed on the chain to prevent damage to the transfer
tube if the chain hoist raises past the programmable limit switch.
5) The chain hoist shall be controlled by wall-mounted momentary push buttons
located both inside the second floor sorting area and on the south side of the
sorting building.
Al-2. DRAWING GM-3
A. CHANGE V-50.32 to an 8"diameter valve
B. CHANGE V-50.35 to a 4"diameter valve
C. Change the size of V-60.1 thru V-60.9 to a 4"diameter valve
Al-3. DRAWING 50 M 2
A. CHANGE the 6" SW(7)pipe to an 8" SW(7)pipe.
B. CHANGE callout for V-40.1 to V-50.31
C. CHANGE callout for V-40.2 to V-50.32
Page 1 of 2

A 1-4. DRAWING 50 M 9
A. Change callout for V-50.3 to V-50.33
B. Change callout for V-50.4 to V-50.34
C. Change callout for V-50.5 to V-50.35
Al-5. DRAWING 60 M 2
A. Change callout for V-60.10 to V-60.11
B. Change callout for V-60.9 to V-60.10

Existing Abandoned Raceways
�✓Use e x istmq /6�� Pint Creek pump
„ k r /1n8 foi HOW waSir 11RC
So'-O"_
`Z/oY fors lap Ivy or screen —
_ ° 6
� C L L D '� J D z a ra Racews a /ao=o"z 6'-0"
' e--Screen — Ql� � - --- _ -
I
:� r► s —
�I
I y •k I t1
-- --
y� but ex/rt/"7 24',� ipa{or W
Unew wgtti,S app, /Z
PLANhIRA[
Scale
I I 5�0� J79R E /D(7-O' - AI- X-a �I
rl
Ek /,
E,16 97 83' ` a
El./6805' E/evaf/onto;;i;dettr •,';,.a bydepfhof 1U,
prese4t2¢'Op�pe.Pie to rest on Ant
-0" 3"-� '
—8"Concrete/fat Dowel
Space do wtLs
all walls except as n o/td
SECTION /�-A Dowels an iota'eexterrle, "/I tb
Use block No,.5 f waroand Use block Nei 6$/6 Use block No/Z wlt-*tm rehor and be 60'/0mF wilh 6 70 ho,7,k
o/oenlofs at COCA coo of raceways r ,s/at C01/ere7e on7bP eaurse ofa//woi/s
RIM
� , I I G X 1 , I, I
' " _ , I I T• _ , I
- -- I '- - I 1 I• n� L7hwt l
Drain Lin B/akNar,r4, ��/Go e Q 6/xks•
tree* I I B/oai Nos 4 1, -,/204 ore SanfowKflo.rl
Akoks.
8"Concrete Mat— Fornys•lobin+/Zblocks to correshn
Use block No/2 Yv;M rebor aw(Conocrete to s/ofs at inditam(.
on this course on inYrrwr end mulls
SECTION C-C SECTION D-D SEGT/DN E-E
a$BCT/DN B-B Typical Typ/'Ca/
Typical
_ Lam— Co"6retm
6 Block
6
Frank- "'Bq�jc�tL" o 0
Dbwe/ 1349020
•
/_�• Rebar ��—Dowel Scraen- 8x8 mcshx°IBwire
Place scr`eas in i"teri"ru�daa//s g /�02 iron wiro fer rc infcreur and Mree /aces Any race tya//s �a Direction of USe onto?of/�2�3�1�4y coMrses OXBOH'H E. UE(/EL Jr r r
P I
SECTION G-G SECTION H-H v4Z W.*,-flow acrosjoidiswit?s{its/nwalls R110EW/1Y
� SECTION I-I
o cre fer-Mf SCaIC I 1-0" I D A H O POWER CO.
1' Typico/ BOISE, IDAHO
vCREEN SCALE / DATE II-26-63
"—F, ArPRoveDD-17982
20

Existing Abandoned Raceways
n
L
z r—T—lS=1�--�T�
�Scrcex� ,
[TrS:�=
0/0CA No I
•• I
I
atr—*No
i
�/a'k No•/4
BLOCK PLAN ELEVATION /697,83'
1349021
OxBOI✓H, � a�wc-�oPrrEnfr
)"CewAY
IDAHO POWER COMPANY BOISE, IDAHO
SCALE DATE
oR.FF APPROVED 20 _/7 9 o 2
TR. V
REV. GM.
5NT 2 12.2

4 v 3 v 2 v1
REVISION
Existing Chinook Raceways D/3/2DDD
FOR
B JOINTS THROUGH BOTTOM SLAB AND SIDE WALLS AT INTERVALS SHOWN BELOW A 2" x 2" EMBEDDED STAINLESS STEEL SCREEN AND STOPLOG SLOTS CONSTRUCTION.
/ 24" PLASTIC CULVERT DRAIN TO PINE CREEK 1 (NOTE: MEASUREMENTS ARE FROM EAST END OF SLAB - NOT WALLS) 1 1
PGN
1/8"x3/4" SS FLAT BAR 2 Ol/10/Ol
AT 6', 18", 30", AND 42" 2 TYP
FROM BOTTOM OF AS BUILT.
CHANNEL ON 46" LONG PGN
CHANNELS, AT 3" AND 11"- - - 2" TYP
E FROM BOTTOM OF CHANNEL 3 5151102 E
ON 14' LONG CHANNELS. _ _ -8.00—INCHES Record lssue
T PL�TF
20'-6" -�25' - 33 -�24'-6 3/16" SS BENof Racewoys
" 8" SUPPLY WATER e WO.p27oaa5oo.
PIPE FROM HEADBOX PCN/p/`
RADIUS AND GRIND SMOOTH
ALL INSIDE EDGES, TYP
6' DETAIL WHERE SLOTS ARE BACK-TO-BACK
C 16' 14 ----------
32" HIGH WEIR WALL
1 1 6' 46" HIGH WALLS, TYP
1 1 2 TYP SS BENT PLATE
EA
2 TYP
16° LONG, 3/8" S.S. R.B. WELDED TO BACK OF SS
30'-8" CHANNEL AT 6", 26", AND 40" FROM BOTTOM OF CHANNEL
D 5' 5' D
127-8 2" x 2" EMBEDDED STAINLESS STEEL SCREEN AND STOPLOG SLOTS
1 1 SCALE: 1-1/2" = 1'O"
129'-8"
PLAN VIEW OF NEW RACEWAYS
8", TYPICAL FOR ALL WALLS, REINFORCE WITH #4 RSTL AT 12" ON CENTER EACH WAY, TYPICAL FOR ALL WALLS AND FLOOR.
2° X 2" STAINLESS STEEL STOPLOG/SCREEN SLOTS AT THE LOCATIONS SHOWN BELOW SLICK, PERFECTLY FLAT SURFACE AT TOP OF CONCRETE WEIR WALLS
SLOPE OUTLET BOX 5'
FLOOR TO DRAIN TO 39, 24' 19'-8" 11'-4" 11'�}►—►
PIPE INVERT I _ELEV 1702.83 (1702' 10°)
C ELEV 1698.5 AT END, OF RACEWAY C —ELEV 1701.67 (1701' 8") AT TOP OF INLET WEIRS C
PIPE INVERT —_ELEV 1699.0 EXISTING GROUND LEVEL IN BOTTOM OF POND
AT TEE AT ELEV 1698.0 AT ELEV 1699.5 - 1699.8
ELEV 1697.5 AT END OF RACEWAY
ELEV 1695.1
ELEV 1696.5 ON FLOOR OF OUTLET BOX
8" AGG BASE COMPACTED TO 95% REL DENSITY AND
ELEV 1695.5 UNDER FLOOR OF OUTLET BOX GRADED TO WITHIN 1/2" OVER 10' 8" PVC WATER SUPPLY PIPE
CAST 24" PLASTIC CULVERT INTO FLOOR SLAB AND WALL
5-3/4-INCH X 3-INCH
ELEVATION VIEW OF NEW RACEWAYS X 4 1/4" WIDEEEP BEAM SOCKETSONG
2" TALL GALVANIZED KEYWAY EMBEDDED IN END OF DIVIDER WALL AND
5-1
/ CENTER OF HEAD WALL.
IN CENTER OF FLOOR SLAB
IN FLOOR SLAB, END REBAR APPRX 2" 1-1/2" DEEP X 2-1/2" WIDE UPSTREAM FACE OF CENTER
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ATTACHMENT E
HEC-RAS MODEL RESULTS
OFH HEC-RAS Model Description ........................................................... 1
Figure 1 — HEC-RAS Floodplain ..............................................................4
Table 1 —Water Surface Elevation Comparison.......................................5
Idaho Power OFH Modeling......................................................................6
Oxbow Dam Tailwater Rating Curves.....................................................16
Oxbow Fish Hatchery Renovation
Attachment D—Baker County Floodplain Development Permit

Schna b el T 208.331.9736
E N G I N E E R I N G 250 S 5th Street,Suite 510 / Boise,ID 83702 schnabel-eng.com
February 17, 2021
Mr. Bill Lynch
Idaho Power
1221 West Idaho Street
Boise, ID, 83702
Subject: Oxbow Fish Hatchery Renovation Project HEC-RAS Modeling
Dear Mr. Bill Lynch:
This letter describes the modeling of the Snake River and Pine Creek completed at the project site in
support of a no-rise certification for the Oxbow Fish Hatchery (OFH) Renovation Project. Oxbow Fish
Hatchery is located alongside the Snake River approximately 3 miles downstream of Oxbow Dam,just
upstream of the confluence of Pine Creek. Construction plans for proposed grading and hatchery
renovation are attached to this submittal in Attachment E. The construction plans also show a vicinity map
of the project area for reference.
GENERAL INFORMATION
The Oxbow Fish Hatchery will be constructed by Idaho Power. The effective regulatory floodplain of the
Snake River at the fish hatchery is shown on FEMA Flood Insurance Rate Map (FIRM) Panel
41001C0325C, which has an effective date of June 3, 1988. The hatchery location relative to the effective
floodplain is shown in Attachment B. Construction of the new buildings and hatchery improvements will be
in the approximate 100-year floodplain (Zone A). Schnabel Engineering has developed a new HEC-RAS
model for the reach of river around OFH because no prior detailed floodplain study exists for the project
location. The hatchery's location relative to the Snake River and the cross sections used in the model are
shown in Figure 1 —Snake River HEC-RAS Floodplain.
Previous modeling efforts have been completed by Idaho Power Company in the past using other
modeling software. The boundary conditions and flow rates developed for these studies were used to
create the one-dimensional HEC-RAS model used for this effort. Summary writeups of these efforts have
been included as an appendix to this letter for reference.
HYDROLOGY
The 100-year flows for the downstream boundary of the Snake River at Hells Canyon Dam on the ID-OR
State Line (USGS gage 13290450) is 126,700 cfs. The 100-year flow for Pine Creek is 4,560 cfs. The
discharge capacity of the Oxbow Powerhouse is 28,000 cfs. Therefore, the resulting 100-year flow in the
Snake River at the upstream Oxbow Dam is 94,140 cfs, with flow change occurring at the inflow locations

Idaho Power
Oxbow Fish Hatchery Renovation HEC-RAS Modeling
of the Powerhouse and Pine Creek'. The Snake River Gage located 1500 ft downstream of the Oxbow
Powerhouse was used in model calibration.
HYDRAULIC MODELING
Existing Conditions
Cross sectional geometry for the Existing Conditions HEC-RAS model is based on a combination of
LiDAR and bathymetric data provided by Idaho Power Company. From this available data, the stream
centerline and cross sections were delineated to create the HEC-RAS geometry. This reach of the Snake
River extends 25 miles from Oxbow Dam to Hells Canyon Dam and includes 204 cross sections.
The Snake River passes under one bridge in the modeled study reach. The Oxbow Bridge (NF-454) is
positioned between cross sections 113453 and 113257 approximately 1000 ft downstream of the
hatchery.
Manning's Roughness
During model calibration, a single Manning's roughness value resulted in the best estimates of water
surface elevations at the Snake River Gage. The manning's roughness value of 0.045 was assigned to
left over bank, right over bank, and main channel flow areas and was assumed a constant along the
alignment of the Snake River.
Boundary Conditions
Multiple scenarios were modeled corresponding to water levels at Hells Canyon Dam between elevations
1,643 and 1,697 ft(NAVD88). A spillway and sluiceway rating curve for Hells Canyon Dam was used to
determine corresponding flow rates. Model results showed that the water surface elevations at Hells
Canyon Dam had very little impact on water levels immediately downstream of Oxbow Dam for flowrates
between 70,000 and 310,000 cfs. It is also assumed that the automatic spill gate operation at Hells
Canyon Dam could be followed to maintain the normal full pool water surface elevation. Therefore, for the
100-year flows the NWL of 1,691.44 ft (NAVD88) at Hells Canyon Dam is used as the downstream known
water surface elevation 2. Additionally, because this model consists of mixed flow regimes, a normal depth
slope of 0.001 ft/ft was chosen for the upstream boundary condition.
Proposed Conditions
The proposed fish hatchery is constructed above the base flood elevations produced in the existing
conditions model, however the proposed grading that the hatchery is constructed on does not. The
proposed grading was produced by Schnabel Engineering and can be seen in the Attachment E drawings
(10 C 3 and 10 C 4). A DEM of the proposed grading was created and integrated into the LiDAR and
' For development of the 100-year flood flows, refer to TM_100yrWSE_OxbowFishHatchery_Stamped.pdf
2 Supporting details for chosen boundary conditions can be found in Oxbow Dam Tailwater Rating Curve
Final TM 20200331.pdf
Project DA592013.00/February 17,2021 Page 2 Schnabel Engineering,LLC

Idaho Power
Oxbow Fish Hatchery Renovation HEC-RAS Modeling
bathymetry terrain used in the existing conditions model. For the proposed condition model, additional
cross sections have been added to capture the ground elevations of the new grading. The location of the
cross section is shown in Figure 1.
RESULTS AND CONCLUSIONS
As compared to the existing conditions model, the proposed conditions model for Snake River showed a
maximum WSE rise of 0.096 ft at cross section 114566,just upstream of Oxbow Fish Hatchery. For all
cross sections through the proposed grading, the resulting water surface elevations are more than 1-ft
below finished floor elevation of the hatchery buildings (1710.0 ft). The entire WSE rise results for the
Snake River can be seen in Table 1. It should also be noted that the width of the floodplain does not
change as a result of the proposed renovation at OFH.
Because of the capacity of the river through this reach, and the regulation of the streamflows by the
upstream and downstream dams, the proposed improvements to OFH cause a minimal rise to the
100-year BFEs. This project therefore complies with Baker County Oregon floodplain regulations and
does not require a Conditional Letter of Map Revision (CLOMR)or as-built Letter of Map Revision
(LOMR) submittal to FEMA.
The construction plans, FDP application forms, and other associated documents are included in this
package. Please do not hesitate to contact us at [phone] if you have any questions or comments.
Sincerely,
SCHNABEL ENGINEERING, LLC
Bryant Charlo, PE Shane Cunneff
Project Engineer Senior Staff Engineer
Attachments:
Figures
Tables
Hydrology Memos
Project DA592013.00/February 17,2021 Page 3 Schnabel Engineering,LLC

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Property Location: Copperfield, Oregon . 114217 . ' r:•El '
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HEC-RAS Cross Sections .. - y
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1 _ 1ti
2 2020 Aerial Imagery from NAIPfi
Computer Base Flood Elevations ) g ry "�.�„ .�; FIGURE NO:
3) Flooding extent and BFE lines are 0 300 600 �.... Schnabel
a Computed 100-year Flooding Extent r based on Schnabel Engineering's
m HEC-RAS model results Feet
m + w W ". �, DATE: 02-17-2021 roe No: DA592013.00

Table 1-OFH WSE Rise
River Station WSE: ExCond (ft) WSE: Proposed (ft) WSE Rise (ft)
114059 1708.149 1708.149 0.000
114097 1707.842 1707.905 0.063
114127 1707.539 1707.493 -0.046
114152 1707.412 1707.227 -0.185
114181 1707.381 1707.254 -0.127
114217 1707.596 1707.500 -0.096
114253 1708.117 1708.043 -0.074
114289 1708.307 1708.255 -0.052
114305 1708.434 1708.325 -0.110
114324 1708.483 1708.361 -0.122
114349 1708.556 1708.447 -0.109
114390 1708.742 1708.671 -0.071
114422 1708.746 1708.694 -0.052
114463 1708.767 1708.790 0.023
114506 1708.934 1709.014 0.080
114566 1709.245 1709.341
114883 1709.103 1709.196 0.093
115472 1710.262 1710.345 0.083
115827 1711.040 1711.119 0.078
116350 1711.293 1711.370 0.077
116815 1711.174 1711.251 0.078
117076 1711.305 1711.381 0.076
117669 1711.463 1711.538 0.075
118325 1711.555 1711.629 0.074
119125 1712.073 1712.142 0.069
119979 1712.507 1712.573 0.066
120792 1712.663 1712.728 0.065
121557 1712.587 1712.652 0.065
122121 1712.555 1712.618 0.063
123046 1714.301 1714.349 0.048
123577 1713.964 1714.013 0.049
124367 1716.917 1716.950 0.033
125007 1716.799 1716.832 0.033
125500 1716.525 1716.559 0.034
126066 1717.272 1717.303 0.031
126790 1717.750 1717.779 0.029
127564 1718.180 1718.207 0.027
128190 1719.203 1719.226 0.023
128995 1720.832 1720.851 0.019
Note:
The Existing Conditions model uses the existing LiDAR terrain
The Proposed Conditions model includes the proposed grading ontop the existing LiDAR
terrain
The green shaded cells are the cross sections that pass through the project location
The red shaded cell indicates the maximum WSE rise

swd�N IDAHO
WOMMIZO
Memo An IDACORP Company
PAoF�To: Timothy Ferguson; Ryan Adelman, P.E.; Stefanie Leth C31 N F /O
From: Kelvin Anderson, P.E.
Jeff Conner, P.E.
Gr reg��� rtf(Za 3
CC: FILE "GTY22,i°.�
Date: 3/13/2013 APB
Re: Water Surface Elevation at Oxbow Fish Hatchery under 100-Year Flow in the Snake
River and Pine Creek
Introduction
IPC is planning to install a dormitory at the Oxbow Fish Hatchery for temporary
employees working at the hatchery. The site of the house is within a flood zone as
identified on FEMA FIRM 41001C0150C, dated June 3, 1988. IPC used a 1-D
hydrodynamic model (MIKE 11)to determine the elevation of a 100-year flood in the
hatchery area. This model indicates that the water surface elevation in the vicinity of the
Oxbow Fish Hatchery is 1,706.97' (NAVD88) (1,703.55' —NGVD29)
Survey Elevation Datum
Most drawing elevations and previous survey work in this area are based on the vertical
datum NGVD29. Recent survey work using GPS equipment, topography, bathymetry,
and all current models are based on the vertical datum NAVD88 and Geoid03. Using the
published NGVD29 elevation of a USC&GS brass cap X 158 (1,708.22') and GPS
derived (NAVD88) elevation of this same brass cap (1,711.64') yields a difference
between these two datums in this area of 3.42' (see Attachment 1)with the NAVD88
values numerically higher than the NGVD29 values. At Hells Canyon Dam (HCD)
previous work has shown that the difference between the two datums is 3'. Care should
be taken to ensure that the proper datum is referenced anytime an elevation value is
referenced or used.
MIKE 11 Model
The hydrodynamic model used in this project was originally developed and calibrated
using data from water stage recorders located upstream of the hatchery area at flows
within the Oxbow Power Plant's normal operations (less than 28,000 cfs). There are
IldallaslRivEnglH CCIHCC_Projects\OxbowHatchery 100yrFloodlTM_100yrWSE_OxbowFishHatchery.docx

limited data available at flows above power plant capacity for calibration, however we do
have some water surface elevation data from the gage at cross section 15,486 (Fish
Hatchery Pump Station) for flows up to approximately 78,000 cfs. There is also a single
point painted on the Oxbow Mess Hall (Cross Section 16180) that is based on the January
1997 high flow. We adjusted the roughness values in the model to match the measured
water surface elevation under both of these high flow events (see Table 1). The mark on
the Oxbow Mess Hall has some uncertainty associated with it including that it is
unknown how much care was taken in precisely noting the exact water level. Recorded
data at HCD show that the headwater was lowered from 1693' (NAVD88) down to 1683'
(NAVD88) during the peak flow and it is not known if the mark indicates the water
surface under the high or low headwater condition. The model indicates that the
headwater level does not make much difference within the range seen and we assumed
the higher headwater value for model calibration.
Table 1. Water Surface Elevations for Model Calibration
HCD
Flow HW Modeled WSE Surveyed/Measured WSE Difference
cfs ft ft ft
100,000 1693 1703.28 1703.31 -0.03
40,000 to 78,000 Varies Varies Varies +0.02*
*Average RMS Error over the range of flows
Roughness values used to achieve this calibration in the Oxbow area ranged from 0.040
to 0.055, values that are within a normal range for river modeling.
The downstream boundary condition for this model is Hells Canyon Dam (HCD)
approximately 25 miles downstream from Oxbow. Spillway capacity at Hells Canyon
Dam is adequate to pass the 100-year flow at normal full pool elevation and lower. For
the calibration flows, the HCD headwater was taken from measured values adjusted to
NAVD88. For this flood study, the headwater at HCD was run at both normal full pool
elevation(1,688' NGVD29 / 1691'NAVD88) and with HCD drawn down 10' to
1681.00' (NAVD88) for the 100-year flow. The upstream boundary condition for the
model is Oxbow Dam, and the model includes inflow from the Oxbow Power Plant and
Pine Creek. Flow at the dam is split between a 100 cfs base flow and flow over the
spillway. Both flows enter at cross section 0.
The model also includes the bridge just downstream of the hatchery site (road NF-454
connecting to Oregon Highway 86).
Figure 1 shows the model cross sections in the vicinity of the Oxbow Fish Hatchery with
the hatchery area highlighted in yellow and the approximate location of the Oxbow Mess
Hall circled in blue.
Ilda I Ias\RivEnglH CCIHC C_P rojectslOxbowHatchery 100yrFloodlTM_100yrWSE_OxbowFishHatchery.docx

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Figure 1. Model Cross Sections near Oxbow, OR
100-Year Flood Flows
Flows with a 1%probability of occurring in any one year are commonly referred to as
100-year flows. The 100-year flow for Pine Creek at Copperfield is 4,560 cfs (Elevation
Certificate dated October 27, 2000 by Hanley Engineering). The 100-year flow for the
Snake River at the USGS gage 13290450 Snake River at Hells Canyon Dam ID-OR State
Line based on Bulletin 17-B Guidelines is 126,700 cfs (see Attachment 2). The upstream
model boundary condition at Oxbow Dam was estimated by starting with 100-year flow
for the Snake River and subtracting the 100-Year flow in Pine Creek and the Oxbow
Power Plant capacity (28,000 cfs). This resulted in flow at the Oxbow Dam spillway of
94,140 cfs [in the model 100 cfs of this flow is run as base flow through the dam (not in
the spillway flow)]. Oxbow Power Plant flow of 28,000 cfs was added into the model
immediately below the Power Plant(cross section 14723). The 100-year flow in Pine
Creek (4,560 cfs) was added in at the Pine Creek location (cross section 16180),just
downstream from the Oxbow Fish Hatchery.
Oxbow Fish Hatchery Water Surface Elevation
The model was run for several hours at an average flow to achieve stable flow conditions.
Flows were then ramped up to total 100,000 cfs and the HCD HW set to 1693.0'
(NAVD88) to match conditions in the spring of 1997 when the mark on the Oxbow Mess
Hall was made. After stabilizing at the 100,000 cfs condition, flows were then ramped up
to the 100-year values for both the Snake River and Pine Creek, over approximately 24
hours and the model was run until stable flow conditions were again achieved. HCD HW
IldallaslR ivEng\H CCIHCC_Projects\OxbowHatchery 100yrFlood\TM_100yrWSE_OxbowFishHatchery,docx

was initially set 10' below normal full pool (1681.0' NAVD88) on the assumption that
Hells Canyon Reservoir would be drawn down in anticipation of high flow. Then HCD
HW was increased to normal full pool (1691.0' NAVD88)to evaluate how much
difference this would make to WSE at the Oxbow Fish Hatchery. Cross section 15486 (#
44 in Attachment 2) is located at the hatchery pump station near the upstream (southeast
side) of the fish hatchery. Water surface elevation at this cross section with the reservoir
at normal full pool is 1,706.97' (NAVD88) (1,703.55' —NGVD29) at the 100-year flow.
Drawing the reservoir down by 10' at HCD only reduces the WSE at Oxbow Fish
Hatchery by about 0.2'. This is driven in large part by a constriction located about
%2-mile downstream of the Oxbow Fish Hatchery, which at high flows can control the
water surface upstream.
Water Surface Elevation Validation
In the winter of 1996/97 a high flow event was experienced across much of southwestern
Idaho and eastern Oregon including the Snake River in Hells Canyon. The peak flow at
the USGS gage 13290450 below Hells Canyon Dam was approximately 104,000 cfs.
This is about 23,000 cfs below the 100-year flow, and tributaries between the Oxbow
Fish Hatchery and the gage 25 miles downstream also experienced extremely high flows
during this event. However, water surface elevations observed during this flood event
should be lower but comparable to the 100-year flow. Anecdotal accounts (Ric Bobier,
personal communication) recall the hatchery raceways being flooded with the water
surface reaching approximately half way up the 6' chain link fence surrounding the
hatchery. A survey control point is located just outside the chain link fence (269.83RL).
The modeled water surface elevation is about 4.5' above this survey control marker(see
Attachments 3 & 4). This anecdotal information from the 1996/97 flood event indicates
that the modeled water surface is reasonable and may be somewhat conservative
(estimates the water surface too high) at high flows.
MallaslRivE ngIH CCIHC C_Projects\OxbowHatchery 100yrFloodlTM_100yrWSE_OxbowF ishHatchery.docx

Identify
Identify from: <Top-most layer>
9..zodiac.GIS,ControlPoint
.....44,971511
I
1
Location: 1,289,356,066 1,413,718.500 Feet
Field 'Value
OBJECTID 100
StampedName X 158
RiverMile 269.75
RiverBank RL
XcoordOrig 1289357,718
YcoordOrig 1413727.489
Latitude 44,971511
Longitude -116.856970
Elevation88 1711.64 1YCr V D 261 l 0 8;ZZ
ElevationEllipsoidHeight 16S8.76 Q = 3. yZ/
GPSEIIipsoidHeight mull>
Monument BRC X 158 US ARMY ENGRS
Type Tertiary
SourceReport JUB - 20090818 for Ox &HC Res flight for IPC Rec Group via email -reproj
Method RTK
SHAPE Point
Status Active
Identified 1 feature

13290450 01.out 3/11/2002
U. S. GEOLOGICAL SURVEY
ANNUAL PEAK FLOW FREQUENCY ANALYSIS
Following Bulletin 17-B Guidelines
Program peakfq
(Version 4 .0, December, 2000)
--- PROCESSING DATE/TIME ---
2002 MAR 11 12:14 :10
--- PROCESSING OPTIONS ---
Plot option = Graphics device
Basin char output = None
Print option = Yes
Debug print = No
Input peaks listing = Long
Input peaks format = WATSTORE peak file
1
U. S. GEOLOGICAL SURVEY
ANNUAL PEAK FLOW FREQUENCY ANALYSIS
Following Bulletin 17-B Guidelines
Program peakfq
(Version 4 .0, December, 2000)
Station - 13290450 SNAKE RIVER AT HELLS CANYON DAM ID-OR STATE LINE
2002 MAR 11 12:14:10
I N P U T D A T A S U M M A R Y
Number of peaks in record = 36
Peaks not used in analysis 0
Systematic peaks in analysis = 36
Historic peaks in analysis = 0
Years of historic record = 0
Generalized skew = -0.300
Standard error of generalized skew = 0 .550
Skew option = STATION SKEW
Gage base discharge = 0.0
User supplied high outlier threshold = --
User supplied low outlier criterion = --
Plotting position parameter = 0 .00
********* NOTICE -- Preliminary machine computations. *********
********* User responsible for assessment and interpretation. *********
WCF134I-NO SYSTEMATIC PEAKS WERE BELOW GAGE BASE. 0.0
WCF195I-NO LOW OUTLIERS WERE DETECTED BELOW CRITERION. 15969.4
WCF1631-NO HIGH OUTLIERS OR HISTORIC PEAKS EXCEEDED HHBASE. 141904 .5
*WCF1512-17B WEIGHTED SKEW REPLACED BY USER OPTION. -0.060 0.054
-1
1
Station - 13290450 SNAKE RIVER AT HELLS CANYON DAM ID-OR STATE LINE
1

13290450 01.out 3/11/2002
1980 48600.0 K 1998 94500 .0 K
1981 44100.0 K 1999 67800 .0 K
1982 87800 .0 K 2000 37500 .0 K
1983 66200.0 K 2001 29400 .0 K
Explanation of peak discharge qualification codes
PEAKFQ WATSTORE
CODE CODE DEFINITION
D 3 Dam failure, non-recurrent flow anomaly
G 8 Discharge greater than stated value
X 3+8 Both of the above
L 4 Discharge less than stated value
K 6 OR C Known effect of regulation or urbanization
H 7 Historic peak
1
Station - 13290450 SNAKE RIVER AT HELLS CANYON DAM ID-OR STATE LINE
2002 MAR 11 12 :14:10
EMPIRICAL FREQUENCY CURVES -- WEIBULL PLOTTING POSITIONS
WATER RANKED SYSTEMATIC BULL.I7B
YEAR DISCHARGE RECORD ESTIMATE
1997 103000.0 0.0270 0 .0270
1998 94500 .0 0.0541 0 .0541
1982 87800 .0 0 .0811 0.0811
1986 78600 .0 0.1081 0.1081
1984 78400 .0 0 .1351 0 .1351
1971 75800.0 0 .1622 0.1622
1972 74700.0 0.1892 0.1892
1996 73400 .0 0.2162 0.2162
1999 67800 .0 0 .2432 0.2432
1983 66200.0 0.2703 0.2703
1974 63300.0 0.2973 0.2973
1975 63200.0 0.3243 0.3243
1976 59200.0 0 .3514 0.3514
1969 55600.0 0.3784 0.3784
1993 55400.0 0 .4054 0 .4054
1970 50600.0 0.4324 0 .4324
1995 48800.0 0.4595 0 .4595
1980 48600.0 0 .4865 0 .4865
1985 48400.0 0 .5135 0.5135
1978 44900.0 0 .5405 0.5405
1981 44100 .0 0 .5676 0 .5676
1989 41900 .0 0 .5946 0 .5946
1979 38600.0 0 .6216 0 .6216
2000 37500 .0 0 .6486 0 .6486
1967 37200 .0 0 .6757 0.6757
1968 35800 .0 0 .7027 0 .7027
1973 31600.0 0 .7297 0 .7297
1994 30900.0 0.7568 0 .7568
1987 30200.0 0 .7838 0 .7838
1988 29800.0 0 .8108 0 .8108
1991 29700.0 0 .8378 0 .8378
1977 29600.0 0 .8649 0 .8649
3

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1-1

FINAL
OXBOW DAM TAILWATER RATING
CURVE HYDRAULIC ANALYSIS
Hells Canyon Complex — Brownlee &
Oxbow Spillway Remediation Project
B&V PROJECT NO.402925
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31 MARCH 2O20
0 BLACK &VEATCH

Idaho Power Company I OXBOW DAM TAILWATER RATING CURVE HYDRAULIC ANALYSIS
AL Revision Record
Rev Description Date Prepared Reviewed Approved
0 Draft 2/5/2020 P. Gonzalez R. Boyce
1 Incorporation of IPC's 2/21/2020 P. Gonzalez R. Boyce R.Boyce
comments
2 Final 3/31/2020 P. Gonzalez R. Boyce T.Schellhase
BLACK&VEATCH

Idaho Power Company I OXBOW DAM TAILWATER RATING CURVE HYDRAULIC ANALYSIS
Table of Contents
1.0 Introduction..........................................................................................................................................1-1
2.0 Hydraulic Analysis..............................................................................................................................2-1
2.1 Modeling Approach.............................................................................................................................2-1
2.2 Model Geometry...................................................................................................................................2-1
2.3 Model Calibration.................................................................................................................................2-4
2.3.1 Regression Analysis.........................................................................................................2-4
2.3.2 HEC-RAS Model Calibration..........................................................................................2-5
2.3.3 HEC-RAS Model Validation...........................................................................................2-6
2.4 Oxbow Dam Tailwater Rating Curve..........................................................................................2-11
LIST OF FIGURES
Figure 2-1 DEM, Seamless vs. Interpolated.....................................................................................................2-1
Figure 2-2 DEM, Oxbow Dam to Hells Canyon Dam.....................................................................................2-2
Figure 2-3 HEC-RAS Model Extents....................................................................................................................2-3
Figure 2-4 Estimated vs. Observed WSE at the Snake River Gage.........................................................2-5
Figure 2-5 HEC-RAS vs. Observed (Regression) Stage-Discharge Curves at the Snake
RiverGage...............................................................................................................................................2-6
Figure 2-6 HEC-RAS Model Results vs. Observed Stage Hydrograph, 2019 Event.........................2-8
Figure 2-7 HEC-RAS Model Results vs. Observed Stage Hydrograph, 2017 Event.........................2-8
Figure 2-8 HEC-RAS Model Results vs. Observed WSE, 2019 Event.....................................................2-9
Figure 2-9 HEC-RAS Model Results vs. Observed WSE, 2017 Event...................................................2-10
Figure 2-10 Oxbow Dam Tailwater Rating Curve..........................................................................................2-11
LIST OF TABLES
Table 2-1 Annual Peak Flows at the Snake River Gage Below Oxbow Dam.....................................2-7
Table 2-2 Oxbow Dam Tailwater Rating Curve..........................................................................................2-12
BLACK&VEATCH I Table of Contents i

Idaho Power Company I OXBOW DAM TAILWATER RATING CURVE HYDRAULIC ANALYSIS
1.0 Introduction
The Oxbow Hydroelectric Project is licensed as part of the Hells Canyon Complex, Federal Energy
Regulatory Commission (FERC) Project No. 1971. Built in 1961 and located on the Snake River at
river mile 273.0,the project consists of an earth-fill dam and fuse plug, concrete service and fuse
plug spillway and apron structures,surge tanks and intake,and powerhouse. It is owned and
operated by Idaho Power Company(IPC) and is used primarily for power production and
recreational use.
As a result of the 2017 FERC mandated Independent Consultant (IC) Focused Spillway Assessment
(FSA) for the Oxbow spillways, several tasks were identified as areas for further analysis and
remediation. In 2018, IPC had the Part 12 IC review each FSA recommendation and provide an
urgency for performing each FSA task item based on inspections and assessments. Items identified
include a stability analysis of the service spillway right training wall (2019-REC-6),an evaluation of
the headcutting potential at the downstream end of the fuse plug spillway(2019-REC-7), a stability
analysis of the fuse plug left training wall (2019-REC-9),an evaluation of anchorage in the service
spillway chute slab (2019-REC-27),an evaluation of the anchorage in the fuse plug spillway
(2019-REC-32) and a CFD hydraulic analysis of the fuse plug spillway(2019-REC-43). Each of these
recommendations require determination of the hydraulic conditions that can occur on both
spillways. An integral part of these hydraulic evaluations is understanding the relationship
between flow and tailwater levels downstream of two spillways.
The purpose of this technical memorandum is to describe the analysis used to determine the
tailwater rating curve for Oxbow Dam.
BLACK&VEATCH I Introduction 1 1

Idaho Power Company I OXBOW DAM TAILWATER RATING CURVE HYDRAULIC ANALYSIS
2.0 Hydraulic Analysis
2.1 MODELING APPROACH
The USACE Hydrologic Engineering Center River Analysis System (HEC-RAS,version 5.0.7)was
used to evaluate flow conditions along the Snake River between Oxbow Dam and Hells Canyon
Dam.
2.2 MODEL GEOMETRY
The model geometry was defined using a combination of lidar and bathymetric data provided by
IPC.The data set included 64 LAS files containing lidar point cloud data,and 12 txt files contain xyz
bathymetric data points.
Elevation values in both lidar and bathymetric data are based on the North American Vertical
Datum of 1988 (NAVD 88). The HEC-RAS model geometry thus has been setup consistent with the
lidar and bathymetric data in NAVD 88. It is important to note that IPC uses the National Geodetic
Vertical Datum of 1929 (NGVD 29) and thus final model results will be reported using the NGVD 29
datum. Also,provided gage data is referenced to NGVD 29; therefore,for calibration purposes,
model results were adjusted to reflect the difference in datum.
The lidar and bathymetric data was combined to produce a composite digital elevation model
(DEM). This DEM extends approximately 25 miles from approximately a half a mile upstream of
Oxbow Dam to a half mile downstream Hells Canyon Dam (Figure 2-2). The DEM does not include
bathymetry upstream of Oxbow Dam or downstream of Hells Canyon Dam.
The composite DEM was developed in three stages.The first stage consisted in developing a DEM
using only the lidar data. This DEM was trimmed to include a swath of no more than 1 mile wide
along the Snake River. Note that the lidar data does not capture topographic information in areas
that were covered with water at the time the lidar data was acquired. The second stage consisted
in developing a DEM based on the bathymetric data. This bathymetry DEM was limited to the
extents of the bathymetric data points. The third stage consisted in combining these two DEMS.
In most areas the combination of the lidar and bathymetric data resulted in a seamless elevation
model. It is important to note,however,that in some areas the bathymetric data does not
completely cover areas missed by the lidar. In these areas the topography/bathymetry was
spatially interpolated from the lidar and bathymetric data. Figure 2-1 shows two example areas
where the lidar/bathymetric data integration resulted in a seamless DEM and where interpolation
was necessary to complete the DEM.
•4, I INTERPOLATES
TOPOGRAPHY/—
�� BATHYM ETRY SS
SEAMLESS INTERe&LAIED
Figure 2-1 DEM, Seamless vs. Interpolated
BLACK&VEATCH I Hydraulic Analysis 2-1

Idaho Power Company OXBOW DAM TAILWATER RATING CURVE HYDRAULIC ANALYSIS
^ S
j
Y
�r
f
i
Elevation (ft)
l 2750
r
r �
s -
1470
Figure 2-2 DEM, Oxbow Dam to Hells Canyon Dam
BLACK&VEATCH Hydraulic Analysis 2-2

Idaho Power Company I OXBOW DAM TAILWATER RATING CURVE HYDRAULIC ANALYSIS
The HEC-GeoRAS software was used to delineate the stream centerline and cross sections used to define
the HEC-RAS geometry. Figure 2-3 shows the model extents and the cross sections used to define the
Snake River channel within the model. A total of 188 cross-sections were used. The model geometry
includes the Oxbow Bridge.
Hells Canyon
Dam
AV
r�..
40 -wow
7
A � —
�:, ,rl = Snake River below
Oxbow Dam Streamgage
- •r
Oxbow
Dam
Figure 2-3 HEC-RAS Model Extents
BLACK&VEATCH I Hydraulic Analysis

Idaho Power Company I OXBOW DAM TAILWATER RATING CURVE HYDRAULIC ANALYSIS
2.3 MODEL CALIBRATION
Historical flow and stage data provided by IPC was used to calibrate the model. Available data included
the following:
• Oxbow Dam spillway discharge
• Oxbow Powerhouse turbine discharge
• Oxbow Powerhouse tailwater stage at the tailrace (NGVD 29)
• Snake River below Oxbow Dam, flow and stage
• Hells Canyon Dam headwater stage and discharge (NGVD 29)
The stage at the Snake River below Oxbow Dam gage (Snake River Gage) was used as the target
parameter for calibration purposes. This gage is located approximately 1,200 feet upstream from the
Oxbow Bridge and approximately 1,500 feet downstream of the Oxbow Powerhouse tailrace. A rating
curve using the Snake River Gage was initially developed to be used as a calibration target. Further
analysis indicated that backwater and discharges from Hells Canyon Dam have a slight but statistically
significant influence on water levels at the Snake River Gage.
2.3.1 Regression Analysis
A regression analysis was performed to obtain a multivariate second-degree polynomial function (shown
below)that was used to define the target water surface elevation (WSE) at the Snake River Gage as a
function of flow at this gage, and headwater elevation and discharges at Hells Canyon. Figure 2-4 shows
the goodness of fit plot of this function; comparing estimated WSE to observed WSE at the gage. The
standard error of prediction of this function is 0.23 ft and the rz statistic of the regression is 0.99.
WSES = 1362.67 + 5.61X10-'Qs + 7.295.61X10-10QS + 7.71X10_SQH — 1.36X10-10QH +0.19WSEH
where,
WSES=water surface elevation at the Snake River Gage
Qs=flow at the Snake River Gage
WSEH = Hells Canyon head water elevation
QH = Hells Canyon discharges
BLACK&VEATCH I Hydraulic Analysis 2-4

Idaho Power Company OXBOW DAM TAILWATER RATING CURVE HYDRAULIC ANALYSIS
1699
1698
1697
rn 1696
N �
Z 1695
N 1694 y=1.00000X
3 ~ R'=0.98585
v 1693
E
w 1692
1691 ,F
1690
1689
1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699
Observed WSE(ft NGVD 29)
Figure 2-4 Estimated vs. Observed WSE at the Snake River Gage
The data used in this regression analysis is a subset of the available stage and discharge data. Data was
excluded using the following criteria:
• Temporal consistency of the data: time periods were excluded if any one of the parameters was
not available for that period.
• Significant scatter in the data was observed when the flow rates were approximately lower than
30,000 cfs. It is likely that fluctuations may occur due to operation of the hydro plants
considering that the maximum capacity for Oxbow and Hells Canyon are 28,000 cfs and
30,000 cfs respectively. Therefore, data from time periods with flow rates lower than 30,000 cfs
were excluded from the analysis.
• Obvious outliers were also excluded from the analysis.
Note that this function was developed within a limited range of flow rates and water levels. Flow rate
approximately ranged between 30,000 cfs and 70,000 cfs, and Hells Canyon headwater levels
approximately ranged between elevation 1683.1 ft and 1687.3 ft (NGVD 29). This function may not be
applicable for flow rates or water levels outside the range used to develop it; thus, extrapolation would
likely result in erroneous WSE estimates.
2.3.2 HEC-RAS Model Calibration
For calibration purposes a series of synthetic conditions were defined to test the model under varying
flow rates (from 30,000 cfs to 70,000 cfs at 2,000 cfs increments) and Hells Canyon headwater levels
(1683.1, 1684.1, 1685.1, 1686.1 and 1687.3 (NGVD 29)). A total of 105 scenarios were evaluated.
Steady state conditions were assumed. For all scenarios the difference between the HEC-RAS estimated
WSE and synthetic(regression) observed WSE ranged between -0.7 ft to 0.4 ft. In general, as flow
increases, HEC-RAS tends to slightly underestimate the WSE at the Snake River Gage. The only
parameter changed in the calibration is the roughness (Manning's n)value assigned to the river channel.
BLACK&VEATCH I Hydraulic Analysis 2-5

Idaho Power Company I OXBOW DAM TAILWATER RATING CURVE HYDRAULIC ANALYSIS
Based on the calibration, it was determined that using a Manning's n value of 0.045 results in the best
estimates of WSE at the Snake River Gage. It was assumed that the Manning's n value is constant along
the alignment of the Snake River.
Figure 2-5 shows the stage-discharge curve at the Snake River Gage obtained from the HEC-RAS model
compared to estimated values based on the regression analysis (assumed observed values). The figure
also shows results if Manning's n values of 0.040 and 0.050 are used in the analysis assuming a Hells
Canyon headwater level of 1685.1 (grey dashed lines). Using a Manning's n value of 0.040 tends to
underestimate water levels (range: -0.4 ft to -1.5 ft) and using a Manning's n value of 0.050 tends to
overestimate water levels (range: 0.49 ft to 0.89 ft).
Stage-Discharge at Snake River Gage
HEC-RAS vs.Regression
1700
1699
1698
1697
1696
1695 _—
1694
o,1693 '
N _
01692
z 1691
w 1690 _
3 1689
1688
1687
1686
1685
1684
1683
30 32 34 36 38 40 42 44 46 48 50 52 54 56 58 60 62 64 66 68 70
Flow(x 1,000 cfs)
Regression 1683.10 —HEC-RAS 1683.10 Regression 1684.10 —HEC-RAS 1684.10
Regression 1685.10 HEC-RAS 1685.10 Regression 1686.10 HEC-RAS 1686.10
• Regression 1687.30 —HEC-RAS 1687.30 —Gage Datum HEC-RAS 1685.10,n=0.040
HEC-RAS 1685.10,n=0.050
Figure 2-5 HEC-RAS vs. Observed (Regression)Stage-Discharge Curves at the Snake River Gage
2.3.3 HEC-RAS Model Validation
The HEC-RAS model was validated using data during two major flood events as measured at the Snake
River Gage below Oxbow Dam.
Data provided for this gage is available from 2003 to 2020. Table 2-1 shows the peak flows measured at
this gage listed by hydrologic year(Oct. 1St through Sep. 301h).The four largest peaks of 78,000, 70,400,
70,270 and 60,500 cfs occurred respectively in 2006, 2011, 2017, and 2019. The 2017 and 2019 were
selected for validation purposes. Even though the 2006 and 2011 events are the largest,they were not
used because the provided discharge data at Hells Canyon Dam only goes back to August 2013 and this
data is needed to define the downstream boundary conditions in the model. To validate the HEC-RAS
model, a time period of two months, centered on each of the two recorded peak discharges,was
modeled.
BLACK&VEATCH I Hydraulic Analysis 2-6

Idaho Power Company I OXBOW DAM TAILWATER RATING CURVE HYDRAULIC ANALYSIS
Table 2-1 Annual Peak Flows at the Snake River Gage Below Oxbow Dam
HYDROLOGIC YEAR •
2003 29,300.00
2004 34,200.00
2005 44,300.00
2006 78,000.00
2007 31,300.00
2008 32,500.00
2009 46,300.00
2010 58,400.00
2011 70,400.00
2012 50,000.00
2013 27,600.00
2014 28,393.78
2015 25,414.09
2016 44,116.50
2017 70,270.06
2018 46,578.32
2019 60,495.80
To validate the model, modeled and observed stages at the Snake River Gage were compared. Inputs to
the model include Oxbow spillway and turbine discharge hydrographs during these events, and
corresponding stage and discharge hydrographs at Hells Canyon Dam to define downstream boundary
conditions.
Figures 2-6 and 2-7 show hydrographs for the 2019 and 2017 events respectively. The figures show that
for the two events,the HEC-RAS model closely predicts water levels at the Snake River Gage. Figures 2-8
and 2-9 show the goodness of fit of predicted stages compared to observed stages. The standard error
of prediction of the model is 0.26 ft and 0.53 ft for the 2019 and 2017 events respectively. Figures 2-8
and 2-9 also show the departure from measured values if a lower(0.04) or higher(0.05) Manning's n
value was used. It is important to note that there are some obvious outliers in the data set. A cursory
inspection of the data set revealed that some of the data is likely to be faulty. No attempts to correct
the data set were done because, even though it is obvious that a few data points are faulty,there is not
a practical way to clean the data set.
BLACK&VEATCH I Hydraulic Analysis 2-7

Idaho Power Company I OXBOW DAM TAILWATER RATING CURVE HYDRAULIC ANALYSIS
1700
1699
1698 Outliers likely due to
1697 faulty data
1696
rn 1695
N
1694
z 1693
S 1692
W
3 1691
1690
1689
1688
1687
1686 —Observed Modeled
1685
y\�oti�, oIP \yo\�oti�, oIP \mooqoti�, \yo\�otia \moo\'(Sti�, oP
-191 5 R P R h h
Figure 2-6 HEC-RAS Model Results vs. Observed Stage Hydrograph, 2019 Event
1703
1702 Outliers likely due to
1701 faulty data
1700 •ip
1699
rn 1698 • !�
N
1697 + n
z 1696 t t t
1695
1694
1693
1692
1691
1690
1689 Observed Modeled
1688
A A A A A A A oti oti oti oti \h\�oti oti oti \h\�oti�
Figure 2-7 HEC-RAS Model Results vs. Observed Stage Hydrograph,2017 Event
BLACK&VEATCH Hydraulic Analysis 2-8

Idaho Power Company OXBOW DAM TAILWATER RATING CURVE HYDRAULIC ANALYSIS
1700 -
1699
1698
1697
1696
1695
t
N �
1694
1693 '
U ' �•.
1692 '
-a)) 1691
O . A;
2 Outliers likely due to
1690 •
•��•, faulty data
1689 . . •�• •:•+
• •
1688
1687
1686 U1
45 deg. n = 0.040 n=0.05 n = 0.045
1685
in t0 r` 00 M O _q N m to W r` 00 01 O
oo 00 00 00 00 M 0) Ol M of M M M M O1 O
lD lD �D lD lD lD lD LD LD lD lD lD lD I'D W r-
Observed WSE (ft NGVD 29)
Figure 2-8 HEC-RAS Model Results vs. Observed WSE, 2019 Event
BLACK&VEATCH I Hydraulic Analysis 2-9

Idaho Power Company I OXBOW DAM TAILWATER RATING CURVE HYDRAULIC ANALYSIS
1703
1702
Outliers likely due to
1701 faulty data
1700 — �•
1699
1698
j 1697
z
w 1696 '
w
Ln
1695 '
-0
� 1694 �'' �•
o • • l
1693
1692 •{
1691
1690
1689
45deg. n = 0.040 n = 0.05 n = 0.045
1688
00 01 O 1--1 N M ":T Ln LD r, 00 Ol O —1 rV M
LD LD LD lD lD lD lD LD LD lD LD lD r, r, r, r�
rH a H —1 `--1 1-1
Observed WSE (ft NGVD 29)
Figure 2-9 HEC-RAS Model Results vs. Observed WSE, 2017 Event
BLACK&VEATCH I Hydraulic Analysis 2-10

Idaho Power Company I OXBOW DAM TAILWATER RATING CURVE HYDRAULIC ANALYSIS
2.4 OXBOW DAM TAILWATER RATING CURVE
The tailwater rating curve for Oxbow Dam was obtained from the calibrated HEC-RAS model.Two
scenarios were evaluated to develop the rating curve. The first scenario assumes that the spillway
gates and sluice gates are fully open at Hells Canyon Dam; a condition that is plausible but not
typical based on normal operations at Hells Canyon Dam. The second scenario assumes normal
operation of the spillway and sluice gates at Hells Canyon Dam.
For the first scenario,a total of 28 scenarios where modeled corresponding to water levels at Hells
Canyon Dam between elevation 1640 ft and 1694 ft(NGVD 29) at 2-ft increments. Corresponding
flow rates were obtained using the spillway and sluiceway rating curves for Hells Canyon Dam. For
the second scenario it was assumed that the automatic spill gate operation at Hells Canyon would
be followed to maintain full elevation at 1688 ft(NGVD 29). Model results show that water levels
immediately upstream of Hells Canyon Dam have very little impact on water levels immediately
downstream of Oxbow Dam for flow rates between 70,000 and 310,000 cfs. For the flow rates
evaluated,the assumption of fully open gates at Hells Canyon results in water levels of up to 0.1 feet
lower than assuming normal operations at Hells Canyon Dam.
The tailwater rating curve is listed on Table 2-2 and depicted in Figure 2-10. The tailwater rating
curve reflects the normal operations at Hells Canyon Dam.
Oxbow Dam Tailwater Rating Curve
1745.00
1740.00
Q1 1735.00
0
z 1730.00
c
0
— 1725.00
v
w
1720.00
1715.00
1710.00
50000 100000 150000 200000 250000 300000 350000
Discharge (cfs)
Figure 2-10 Oxbow Dam Tailwater Rating Curve
BLACK&VEATCH I Hydraulic Analysis

Idaho Power Company I OXBOW DAM TAILWATER RATING CURVE HYDRAULIC ANALYSIS
Table 2-2 Oxbow Dam Tailwater Rating Curve
FLOW RATE TW ELEVATION
70,000 1712.9
73,000 1713.4
77,000 1714.2
81,000 1714.9
85,000 1715.6
91,000 1716.6
97,000 1717.6
103,000 1718.6
109,000 1719.5
117,000 1720.7
124,000 1721.7
132,000 1722.8
141,000 1724.1
149,000 1725.1
159,000 1726.4
168,000 1727.6
178,000 1728.8
188,000 1730.0
199,000 1731.2
210,000 1732.5
221,000 1733.7
233,000 1735.0
245,000 1736.2
257,000 1737.4
270,000 1738.7
283,000 1740.0
296,000 1741.2
310,000 1742.5
BLACK&VEATCH I Hydraulic Analysis 2-12

Oxbow Hatchery Renovation Construction Project
2021 Construction-RFP
The purpose of Question and Answer Document is to provide a response to the questions that were received as part of this request for bid.
Below are the questions and answers in response to an inquiry submitted via PowerAdvocate.
Please acknowledge receipt of this Question and Answer Document as part of your Proposal. Failure to do so may subject respondent to is qualification.You can acknowledge receipt in your proposal cover letter and or within the proposal itself.
Q+6:15uesti Date Reference Question Response Response Addendum#
on# Submitted Date
3/10 C 5,Note 3 states that all piping under slabs shall be encased
per the standard details.Shall this include process piping only and Encase all piping,domestic and process,under the building slabs.Process and drain
1 Feb-23-2021 Scope not domestic plumbing?Does this include the piping under the Mar-12-2021 2
p g. p p g piping under the raceways shall also be encased.
raceways?
10 C 5,calls for 300/GC-5 at each well location.It appears that Only two well vaults(Detail 300/GC-5)are required.The well casings are existing,
2 Feb-23-2021 Scope there are only 2ea and not 3ea as indicated,please confirm.Please Mar-12-2021 but will require a new flange be welded onto the top for connection as shown in the 2
confirm each well casing is existing. detail.
3 Feb-23-2021 Scope 10 C 5,please provide a specification and detail for the sewer lift Mar-12-2021 See Specification 11076 provided in the Bid Documents 2
station.
Route each section of 4-in.perforated drain pipe(along each section of retaining
4 Feb-23-2021 Scope Mar-12-2021 wall)to a single low-point and discharge the collected water through a tee that 2
passes through the retaining wall,directly to the down-slope side.Cover the end of
10 C 8,where do the perforated drain tiles between retaining walls drain drain pipe with filter fabric secured with stainless steel band.
to?
Special Conditions,Item 2b,will the Building Permit and Floodplain IPC is currently working with Baker County to procure the Floodplain Development
Development be ready to be pulled immediately following the bid? Permit. Contractor will be responsible for prcureing and paying for the building
5 Feb-23-2021 Special Conditions Mar-12-2021 permits,electrical,mechanical and other permits required for building the project. 2
fl the contractor responsible for paying the building permit and (Note:IPC is also responsible for the 404 permit,FERC Clearance and Cultural
oodplain development permit fees?
Clearance,which are ongoing.)
6 Feb-23-2021 Schdule of Values Where in the schedule of values do we include the irrigation tank Mar-12-2021 See Updated Schedule of Values 2
replacement
Has preliminary approval of the 404-permit been achieved?Can No approval has bee achieved for the 404 permit. The US Army Corps of Engineers
any comments by the AHJ be provided to the Contract for bidding? will the be governing agency and it is anticipated that we will be required to
7 Feb-23-2021 Permits Mar-12-2021 2
maintain 401 Water Quality Certification requirements and work in specified work
windows for sensitive species considerations.
Are as-builts of the existing facilities available?
8 Feb-23-2021 Scope Feb-26-2021 Yes.Attached to adendum Ol. 1
The specifications require mock-ups of major equipment like the
crowders and incubators prior to releasing them to fabrication. This The mock-ups are required for all equipment listed in Specification 01345,Section
9 Feb-23-2021 Schedule will likely make the lead times exceed the needed delivery dates. Is Mar-12-2021 3.2.The Contractor shall plan their schedule accordingly to meet the mandatory 2
it acceptable to forego the mockups if the duration extends past milestones provided.
mandatory milestones?
Both.The units will be visually inspected for quality(clean welds,no scaling or
10 Feb-23-2021 Schedule If full scale mockups are required,is the expectation to achieve a Mar-12-2021 rusting,proper coatings,acceptable tolerances,etc.).The mockups will also be 2
visual inspection or an operational inspection? operationally tested as required by Specification 01345,Section 1.2 H 1 and 2.
Has the building permit and flood plain permit applications been Building Permit will be the responsibility of the contractor. IPC will provide the
11 Feb-23-2021 Permits submitted? Mar-12-2021 2
Floodplain Development Permit once it has been obtained.
Will the demo(scrap)metals that Idaho Power wants retained be
12 Feb-23-2021 Recycling shipped back to the Franklin storage yard by Idaho Power? Mar-12-2021 IPC will provide the container and shipping to and from Oxbow and the recycle yard. 2
13 Feb-23-2021 Scope Who is responsible for providing and paying for Programing? Mar-12-2021 Contractor will be responsible for providing and paying for all programming. 2
P P P 9 P Y 9 P 9 9�

14 Feb-23-2021 What SCADA software should the Contractor include in their bid? Mar-12-2021 Wonderware(now Aveva) 2
60 A 1.1,Incubation Room 110 calls for Keynote 1 on the ceiling,
acrylic finish over fiber reinforced stucco over%"cement board,is Yes,this is the correct ceiling finish for the Incubation Room.The ceiling shall be
15 Feb-23-2021 Scope this the correct ceiling finish for this room?If so,how shall it be Mar-12-2021 finished to within''/:"of all penetrating items,and the gap shall be filled with a 2
finished at the support pipe header rack penetrations? sealant that matches the finish and provide 100%vaporproof barrier.
The mechanical drawings have several fabricated steel pipe callouts
(many on Sheet 30 M 1 and 2).,of which call out Group(1)for pipe
material,which per the Piping Material Schedule on Sheet GM2
defines(1)as Steel pipe,with fusion bonded epoxy lined and Material type 1(SCH 40 steel)was intended for all piping at the aeration tower,
coated.Is the intention to have fusion bonded epoxy on these furnished with an epoxy lining and coating.Material type 4 is AWWA fabricated
16 Feb-14-2021 Scope/Drawings systems?Should Group(4)be specified for the steel piping?Group Mar-12-2021 2
steel pipe with a LifeLast DuraShield lining and coating per Specification 15063,
(4)includes the typical coating/lining for these types of systems. Section 2.11',and is not intended for use at the aeration tower.
Please confirm pipe type callouts on mechanical drawings for
fabricated steel piping are accurate and as intended.
Plan sheet 30 M 2 references routing 6 each F(formalin)lines.
Please provide more information.Where do they originate,where/ A single 6-in.diameter SCH 40 PVC conduit pipe is routed from the formalin room in
how do they terminate? the sorting and spawning building(50 M 14)to the aeration tower.Within that
17 Feb-14-2021 Scope Mar-12-2021 conduit pipe,a length of%-in.diameter vinyl tubing shall run from the formalin 2
room to each of the corresponding six raceway distribution boxes at the aeration
tower.One tube should be secured to the interior of each raceway distribution box.
Plan sheet 40 M 2 reference the TT(transfer tubes)please provide a
detail of the concrete wall penetrations for the transfer tubes at the Details for the transfer tube penetration on the west side of the structure are
east and west sides of the structure. provided in Section A/40 M 2 and Detail 1/40 M 3.On the east side of the structure,
18 Feb-14-2021 Scope Mar-12-2021 the transfer tubes that deliver fish to each raceway should be directly cast into the 2
raceway walls as called for on 50 M 3.Additional details have also been provided for
the transfer tube penetrations through the masonry Sorting and Spawning Building
and the truck transfer tube piping in the attached drawings.
Please provide a detail of how the river intake pump manifolds The pump-can includes an integral sole plate at the top that shall be mounted to
terminate at the top?Is the pump a flanged connection to the pump
can?Or,is the pump bolted to an equipment pad? cast-in-place anchors(size provided by the pump manufacturer)in the concrete
equipment pad located on top of the intake pump station deck as shown on 20 M 1.
19 Feb-14-2021 Scope Mar-12-2021 The connection between the pump discharge head base plate and pump can/sole 2
plate shall be achieved by a flanged connection with tapped holes in the sole plate.
Final design and details to be submitted by equipment manufacturer for approval by
engineer.
The 24"SW pump discharge is steel,and the yard pipe for the 24"
SW is C-900.Where is the transition from material types and how is The transition shall occur just upstream of the 45°Elbow at coordinate Al(See
20 Feb-14-2021 Scope this transition made? Mar-12-2021 sheet 10 C 6).Use a restrained sleeve coupling adaptor to transition from plain end 2
steel to C900/905.
Detail 213/GC-2 is missing from the plan set,it was referenced on
sheet 10 C 5.Please provide detail. The detail is meant to reference a Cleanout to Grade(COTG).The detail is included
21 Feb-26-2021 Scope/Drawings Mar-12-2021 here for reference.On 10 C 6,change the detail callout"242/GC-3"to reference the 2
new COTG detail"213/GC-2".
Sheet 10 S 4 is missing from the plan set,it was referenced on The reference should refer to the new dorm building foundation.Change the
22 Feb-26-2021 Scope/Drawings sheet 10 C 1.Please provide missing sheet or provide a different Mar-12-2021 2
call out. reference to Sheet 10 S 3.
Drawing 10 C 8 note#3 States place riprap along the toe of the
retaining wall along the Snake River and Pine Creek as shown.There Riprap should be placed at a minimum of 3'deep and extend 6'from the face of the
23 Feb-26-2021 Scope/Drawings does not appear to be any detail showing riprap along the retaining Mar-12-2021 retaining wall along the Snake River and Pine Creek.Riprap is not needed along the 2
wall,and there is not specification for riprap.Please provide details southern retaining wall(Sections A through D).Modify Specification 02200 as
for riprap placement. described in the SPECIFICATION section attached.

Specification 02200 2.1 Re-use of on-site materials,states that there
is a substantial quantity of material near Brownlee Reservoir that
may be used in the construction of permanent features.
a.Please provide gradation,proctor and moisture content test
reports.If reports are not available should bidders assume the IPC has dicovered a discrepancy about the material at the toe of Brownlee Dam.
material is acceptable for bidding purposes.If acceptable,for which Originally,IPC suggested that this material could be used for 3/4"road mix.
24 Feb-26-2021 Scope/Specifications specified material types will it be acceptable? Mar-12-2021 Currently,IPC is waiting for verification about access and hauling requirements and 2
restrictions due to other projects at Brownlee Dam. As such,bidders shall assume
b.Is there an existing access road to the materials at Brownlee the material in question at the toe of Brownlee is not available for this project.
Reservoir that is suitable for trucking and equipment to load out the
materials and haul to the job site?Where is the access road
located?
Refer to specification section 03310 2.9 B.3.Fly Ash.Is the 25%fly The specified fly ash quantity was done to control the potential for ASR.If the batch
ash requirement considered to be a maximum replacement plant has familiarity with a proposed mix design,and recent testing data on the
percentage?Will mix designs with less than 25%fly ash be aggregate source to confirm that the aggregate is not reactive(meets section 03310
25 Feb-26-2021 Scope/Specifications considered for the project? Mar-12-2021 3.1.13.3),less than 25%fly ash will be considered.If an alternative mix design is 2
proposed,the Contractor should submit a list of ITO projects where the exact mix
design has been approved and used,and aggregate test results from within the last
2 years.
Refer to specification section 03310 3.1 B.2.Shrinkage Limitation.
Does this specification section apply to all concrete placed on the
26 Feb-26-2021 Scope/Specifications project,or is it specifically required for hydraulic structures? Mar-12-2021 This limitation applies to all concrete placed on the project. 2
Is water for site work and dust control to be made available to the
27 Feb-26-2021 Site contractor from an onsite source by Idaho Power? Mar-12-2021 Yes.There is currently a truck fill station on site that is available for use. 2
Should it be assumed that detail C244/GC-4 applies to the 36"Drain Yes—Detail C244/GC-4 should be followed for the outfall of the 36"drain line,no
28 Mar-01-2021 Scope line that extends to the Snake River?Is there supposed to be a grate Mar-12-2021 backflow valve or screen is required.The detail also applies to the 12"storm drain 2
or a backflow valve at the discharge end of the pipe? outfall.See the SPECIFICATION section below for riprap details.
Will you accept a Chief Pre-Engineered Steel Building for the
29 Mar-01-2021 Scope raceway structure? Mar-12-2021 If the other requirements of Specification 13121 can be met,this manufacturer is 2
acceptable.
What is the final finish floor elevation for the Airburst BLDG?
30 Mar-01-2021 Scope Mar-12-2021 1,704.70'per 10 C 4. 2
Workstation Desk in lobby 101 H38292LNS has drawers on one side
31 Mar-01-2021 Scope — Mar-12-2021 Yes. 2
is this correct?
Office desk#102 H38L66NSL is not a HON part number. The 66" Model should be H38L6630NSL,as noted in the finish schedule.This model includes
32 Mar-01-2021 Scope desk and return—is the return on the left or right side? Is the return Mar-12-2021 2
g the base desk with a right return.
The HON spec for the office chairs is W40. Are you really asking for
33 Mar-01-2021 Scope WP40 which is a black vinyl chair? Mar-12-2021 Yes,please change the model number to HIWM2.A.H.M.WP40.T.5B. 2
Is Idaho Power providing and asbestos and lead paint survey for
34 Mar-01-2021 Scope demolition of the existing hatchery building or it the responsibility Mar-12-2021 Yes. A Report is being generated currently. Preliminary results show 2
of the contractor to provide as part of their bid?
Will Idaho Power be moving all contents from the existing hatchery IPC will make arrangements to remove and store most contents from the existing
building? hatchery building for later use. Contractor is required to remove retain and reuse
35 Mar-01-2021 Scope Mar-12-2021 2
the existing incubation equipment that is to be transferred to the new Hatchery
Building

Does the pre-engineered steel building structure over the new Specification 13121,Section 2.3.A call out"Roof Liner Panel",which is referring to
36 Mar-01-2021 Scope raceway get a liner panel under the entire roof? Mar-12-2021 the standing seam metal roof.The entire roof of the pre-engineered building shall 2
be covered with standing seam metal panels.
Is the contractor installing the pre-engineered steel building require
37 Mar-01-2021 Scope to hire and independent inspector for testing the structure? Mar-12-2021 Yes,per the requirements of Specification 13121,Section 2.6.A. 2
Overhead power that is currently over the existing Chinook
raceways are not shown to be demolished and relocated on sheet Mar-12-2021 IPC is currently working on relocating the overhead power line that is over the 2
38 Mar-02-2021 Scope 10E2.It appears this line will have to be relocated to construct the Chinook Raceways. It is planned that this will be done in in April.
new Adult Holding Facility.
The drawings indicate a 4"grout pad on top of the East Raceway The finished floor of the cross crowder channel shall be a 4"grout layer as shown in
39 Mar-02-2021 Scope slab.Please confirm if 4"of grout is to be placed on top of the entire Mar-12-2021 Detail 1/40 S 4.This is to allow for adequate drainage with precision contouring that 2
length and width of the East Raceway slab would be difficult with a mass concrete placement.
In reviewing the Historical Utility Site Plan provided in addendum
#1,the overhead power to be demolished that runs to the
northwest corner of the existing holding ponds suggests this is the IPC will have this power relocated to a temporary underground feed. Power must
40 Mar-02-2021 Scope power supply to the existing crowders.Is the contractor to relocate Mar-12-2021 2
this power supply to the existing crowder and aeration pumps?If be maintained Burring construction.
we are to supply power to existing crowder and pumps,when is this
work to be done and what route should be taken
Fiber optic/Phone lines are indicated to run under the new Hatchery If sequencing does not allow for utility routing shown. Contractor will have the
41 Mar-02-2021 Scope Building to the existing Hatchery Building.Are these to remain in the Mar-12-2021 2
current location option to rerout the utilities in question.
In volume 1 sheet GI 5 the Crowder network diagram shows several Drawing GI 5 provides a general network diagram for crowder communications.The
items such as PLC,VSDs and network switch in each panel. I volume Contractor is responsbile for determining,furnishing,and testing the equipment
2 sheet 40 110 the typical panel layout does not itemize any of necessary to achieve a fully functional system based on this diagram.
42 Mar-02-2021 Scope those items in the Bill of Materials. It appears that information is Mar-24-2021 3
missing from the Bill of Materials for those panels. Do you have any As stated in specification 11425,the crowder drawings and specifications are
additional information about those panels and what needs conceptual in nature,and a single systems integrator shall be responsible for
quoted completing final design,fabrication,and testing of the crowders and associated
systems to show that they meet the stated design requirements.
The Air Burst Control Panel is existing and shall be connected to'INT-RIO'
There are two panels that are listed in Volume 1 on sheet GI 4,Air DISTRIBUTED 1/0 PANEL as shown on GI 4.On 20 12,change"(E)Chiller Control
Burst Control Panel in Area 20 and Chiller Control Panel in Area 60 Panel"to"(E)Air Burst Control Panel".
43 Mar-02-2021 Scope Mar-24-2021 3
that are not listed in any other drawings. Do we need to provide a The Chiller Control Panel shall be furnished as part of a packaged system from the
bid for these panels? chiller manufacturer.It is new and shall be part of the Contractor's bid.As shown on
GI 4,connect the Chiller Control Panel to'OXB-CCP'CONTROL PANEL.
There are some additional items on the Process Network diagram
(Vol 15heet GI 4)that are not detailed in any layout drawings. Do Network Diagram shows basic infrastructure for CCTV and LAN.VFD's are shown in
44 Mar-02-2021 Scope you have more information on the following-CCTV Control Mar-24-2021 3
Station/DVR(Area 50),8 VFDs(Area 50),Local Access Network their respective areas on Electrical and Controls plans and Division 16 Specifications.
Patch Panel at TTB(Area 60),6 VFDs(Area 60)

After a review of the contract documents it is still unclear whether
IPC will directly contract or execute the SCADA programming or if it
is to be sub-contracted under the contractor scope of work.Per Contractor to provide programming for all systems and shall be included in the
Exhibit C—Special Conditions SC-2 General Scope of Work A and B it instruments and controls package that is identified in each Area of the SOV. If
45 Mar-03-2021 Scope is not identified.Per Division 13 spec section 13440 1.1 D 1-5 it is Mar-12-2021 Contractor would prefer to show the entire SCADA programming as a stand alone 2
still vague if the PROGRAMMER is a sub to the general or to the item,it can be shown as an additional line item. Please indicate as such in the
owner.Furthermore,it is not identified as a special line item in the narrative.
schedule of values.Is the SCADA programming under the owner's
supply and only for us to coordinate and schedule with?
Reference:Drawing 50-M-2&50-M-9,Question:Drawing 50-M-2
indicates that the SW supply from the aeration tower to the fish lift The SW pipe that delivers water to the false weir should be an 8"diameter pipe.The
system false weir is to be a 6"pipe whereas 50-M-9 Plan and pipe is run in C900 from the tee(Coordinate C3 on 10 C 5)to the sleeve coupling
46 Mar-03-2021 Scope Mar-24-2021 3
Section A indicate this pipe to be an 8"304 stainless line.Please upstream of the valve vault on 50 M 2 where it will transition to stainless steel(pipe
confirm the correct sizing and material type/transitions from the type 7)with a sleeve coupling adaptor.
valve vault to the false weir connection.
Sheet 10 C 8 shows retaining wall details for the site perimeter.
Detail A and B call out 12"thick 4"-6"quarry spalls up the face of The Quarry Spalls are called out due to the local availability. These are intended to
47 Mar-04-2021 Scope Mar-12-2021 provide drainage.If Contractor would like to propose an alternative to the detail 2
the wall.Is this correct or should this material be a smaller gradation shown,please indicate as such in the narrative.
drain rock?
Reference Plan Sheet 50 M 8-the lodaphor system states pipe type The pipe type was inteded to be Polyvinylidene Fluoride(PVDF),SCH 80 with Heat
48 Mar-04-2021 Scope of LLDPE,system 17,which does not appear to be in the pipe Mar-24-2021 fused fittings and stainless valves.Stainless Steel piping and fittings are an 3
schedule.Would Stainless Steel pipe,fittings and valves be acceptable alternative for this system.
acceptable for this system.
Reference plan sheet 50 M 2,in the 9'L x 5'vault there is reference See Question 46 for the answer to the pipe size question.
to a 6"BFV,V-40.2 This does not match the valve schedule.Plan
sheet 50 M 9 has this SW line as 8".Which is correct?The 12"BFV Section A on 50 M 9 shows the 12"pipe terminating at the inside face of wall.This
49 Mar-04-2021 Scope in the vault is numbered V-40.1,this does not match the valve Mar-24-2021 pipe and any other pipes that penetrate concrete walls shall have a seep ring as shown
schedule?The 12"SW from the vault terminates at the fish lifting shown on detail M203 sheet GM-5.
system,50 M 9.How does the 12"SW terminate at the fish lifting The valves are mis-tabled on G4 and 50M2.The valves should reference V-50.31 and
station? V-50.32 in the valve schedule on GM-3.Change V-50.32 to an 8"diameter valve.
In the adult raceways the 12"TT pipe spans 10'.What is expected The pipes will be directly cast into the walls of the raceways at each end and free
50 Mar-04-2021 Scope Mar-24-2021 3
for pipe supports if any? span the 10'dimension.No additional pipe supports are required.

PIlease provide existing facility as-built or record drawings and
indicate year that the existing facility was completed include any
modifications or remodel work.
51 Mar-09-2021 Scope/Drawings a.®lease provide existing bottom of slab elevation for the Mar-12-2021 See Addendum 01 2
following:
i.Abandoned Raceways
nZall Chinook Raceways
iii.Adult Holding Ponds
52 Mar-09-2021 Scope/Specifications Will the'PROGRAMMER'as defined in Spec Section 13440 be Mar-12-2021 Contractor shall provide the programmer 2
contracted by the OWNER?
Will the dormitory resident(s)be living in the dorm while it is moved
53 Mar-09-2021 Scope for foundation work?Will we need to temporarily connect septic, Mar-24-2021 No,The dorm will re emptied by ro or y prior to moving. No temporary utilities 2
or housing will be required to be providedd b by contractor.
power,and water,or provide an alternate temporary facility?
Will equipment,materials,and trailers be moved from the
54 Mar-09-2021 Materials/Equipment contractor staging area on the south side of the project prior to Mar-12-2021 Possibly. IPC will accommodate some material relocation from the laydown area, 2
however there is not currently a plan to relocate the items in question.
construction start?
As per GC-33.3,hazardous materials were brought up at the site
visit,is IPC aware of any known hazardous materials,such as
asbestos or lead on the project site?
55 Mar-09-2021 Hazmat Mar-24-2021 Please see report from Industrial Hygiene Resources 4
a. Oregon state law requires a demolition permit for all structures,
has IPC procured the demolition permit?The demolition permit
requires an asbestos survey and,if built before 1978,a lead survey,
have these been performed?
Per SC-14 salvage bins will be provided by IPC for the miscellaneous
56 Mar-09-2021 Recycling/Salvage steel demolition.Will hauling of these bins to and from Franklin Mar-12-2021 IPC will provide dump bins(-20 cubic yards)as necessary for misc.steel demo. 2
Road be performed by IPC or the contractor? Please provide These bins will be dropped on site at Oxbow Hatchery and picked up by IPC.
dimensions of these bins to properly estimate the steel demolition.
Sheet 10 C 8,Note 3 references placing rip rap along Snake River Riprap should be placed at a minimum of 3'deep and extend 6'from the face of the
57 Mar-09-2021 Scope and Pine Creek'as shown',please identify where the rip rap detail is Mar-12-2021 retaining wall along the Snake River and Pine Creek.Riprap is not needed along the 2
located.Also,please provide detail showing replacement of rip rap southern retaining wall(Sections A through D).Modify Specification 02200 as
with native fill at southern side and the extents of placement. described in the SPECIFICATION section attached.

Media provider Jaeger Tri-Packs are not available in I%"size for the
Surface Water Aerator,this was discontinued 10 years ago
58 Mar-09-2021 Scope according to a supplier. The options are 1",2"and 3%"offered by Mar-24-2021 2"Jaeger Tri-Pack media is acceptable for the surface water bulk aerator. 3
Jaeger.Please specify which size for the Surface Water Aerator
media.
Reference plan sheets 10 C 6 and 20 M 1-4.The SS CA line is called
59 Mar-09-2021 Scope out as 4"and 6"on various plan sheets.Is the line only 4",or does it Mar-24-2021 The SS CA line shall be 4"everywhere.The callout on Section A/20M4 shall be 4". 3
change somewhere?
Sheet GC-3,Detail C240 and Detail C241 show catch basin and The catch basin may be precast and meet meet the size and elevations provided on
manhole details.Would it be acceptable to provide precast storm the drawings.Precast structures will be reviewed at shop drawing time.
60 Mar-09-2021 Scope structures?In addition,the manholes are designated as 96" Mar-24-2021 3
Diameter,which appears very large for the size of pipe penetrations A 72"diameter manhole is allowable at MH-3,6 and 7.A 96"diameter manhole is
at each manhole.Please advise if manhole size of 96"is correct and required at the other locations due to the multiple penetrations and hole sizes at
typical for all manhole locations. those manholes
61 Mar-09-2021 Scope Reference plan sheets 10 C 5 and 60 M 5,where does the 4" Mar-12-2021 Pumped ground water is supplied by existing wells#1 and #2,which feed to the 2
Pumped Ground Water originate?Out of the Hatchery Building? aeration tower.
Reference plan sheet 10 C 5,the 2"PW(plant water)calls for pipe
62 Mar-09-2021 Scope system(21).The pipe schedule has system 21 as double contained Mar-12-2021 PW is potable water that is fed from the domestic well. Double walled pipe is called 2
fusion pipe,Asahi Chem Prolock,butt fusion.Please advise if this out due to the potable water line being within the same areas of process water.
pipe material is intended for the 2"plant water buried piping.
Plan sheet 10 C-5 references detail C-300 on GC-5,and Says typical
63 Mar-09-2021 Scope of 3.We find only 2 water wells with manhole..If there is a third Mar-12-2021 There are 3 wells o ground
d water wells.(including the domestic well). However the detail only 2
well and manhole,where is it located? applies to the two groun
Addendum 1 includes a specification for drilled piles.Will driven
64 Mar-09-2021 Scope a contractor would like to propose en alternative to the drilled piles,please indicate
p piles be acceptable as originally specified if preferred by the Mar-12-2021 as such in an alternative for value engineering. 2
Contractor?
Overhead power that is currently over the existing Chinook
65 Mar-10-2021 Scope raceways are not shown to be demolished and relocated on sheet Mar-12-2021 IPC is currently working on relocating this overhead powerline. 2
10E2.It appears this line will have to be relocated to construct the
new Adult Holding Facility.
66 Mar-10-2021 Scope Can the roof panels for the raceway structure be changed to 16" Mar-12-2021 Please provide as an alternative for value engineering. 2
wide-24 ga?

01660-3.3-C requires that a leakage test is passed prior to the 14-
All pipes shall be leak tested per the requirements outlined in the fluid service
67 Mar-10-2021 Scope day continuous run test.Please provide the requirements of leak Mar-24-2021 schedule on GM-2.To complete the table,GWP,SWP and TT piping shall have a 3
testing.What structures require leak testing?What is the leak type"(A)"leakage allowance,and the TT piping shall be tested per Note 6.
testing method and duration? yp g p p g
03310-3.17 requires wet curing for concrete that buried or
backfilled.Is it acceptable to chemical cure all the walls and slabs
instead of wet curing?Due to the time of year when some of this Alternatives to wet curing will be considered based on time of year and temperature.
68 Mar-10-2021 Scope Mar-12-2021 Curing compounds will be considered for certain applications that do not expose a 2
concrete work is taking place,wet curing may cause the concrete to biohazard to the fish culture.
freeze.Can curing compound remain on the exposed concrete or is
to be blasted off?
01345-3.2-A.1 requires a mock-up for each internal and external
69 Mar-10-2021 Scope wall type for all buildings.Can the mock-ups be foregone for Mar-12-2021 Contractor shall plan on mock-ups as specified. Alternatives will be considered on a 2
product samples?The difficulty for preparing over 10ea case by case basis.
independent mock-ups seems erroneous.
01345-3.2-2&3 requires'complete functional testing'for the
The requirement for complete functional testing of the mockups shall remain as
crowder mock-ups prior to fabricating the rest of the units.To specified.This test shall demonstrate that the mockups meet all specified
perform a complete functional test of the crowders,the LCP's,VFD's
and PLC's need to setup,installed and tested as well as the requirements,including foward and reverse travel,up and down fence movement,
70 Mar-10-2021 Scope programming software for running through all of the commands. Mar-24-2021 and fully functional onboard power and controls.The functionality described in 3
11425 paragraph 2.5.G,items 3 through 5 is not required for initial mockup testing,
Setting up temporary provisions for this mock-up test would be time as these items require wireless communication with the hatchery's main SCADA
consuming and expensive.Can the mock-up requirement be
reduced to a visual inspection only? system.
The diffuser box shown on 4056 may be cast-in-place with a waterstop along the
10/S-6 calls for'Precast Diffuser Boxes',can this box be cast-in- slab/wall interface.Reinforcing shall follow the standard details provided in the
71 Mar-10-2021 Scope place?If so,should there be PVC bulb waterstop between the Mar-24-2021 general details and shall be reviewed by the Engineer with the shop drawings.The 3
slab/wall intersection?What is the piping penetration detail at the supply and drain pipes at the invert of the diffuser box terminate at the inside face
bottom of these boxes? of concrete and shall include a seep ring through the slab as shown on Drawing
40M4.
a.See plans and instrument schedules
Flowmeters:
a.MCompact or remote transmitter? b.Sensor to transmitter lengths vary,field verify prior to ordering.
72 Mar-10-2021 Scope b.Dlf remote,what is the cable length from sensor to transmitter? Mar-24-2021 3
c.DElectrode material?316 ss,Hastelloy C c.See Specification 13441,Section 2.2 C
d.OLiner material?PTFE,Natural rubber,polyurethane
e.DOutput?4-20 mA,ethernet IP d.Natural rubber liner
e.Sensor output per Specification 13441,Section 2.2 E
Raceway Gate Actuators: a)See 40M5 Note 1
73 Mar-10-2021 Scope a.M/hat is the torque requirement? Mar-24-2021 b)See 40M5 Note 3 3
b.What is the stem dimension?
c.@ there a mounting pad?
c)The actuator shall be mounted to the concrete raceway as shown on 40M5.
Raceway Level Transmitters:
a.mhe model that was listed by the engineer is being phased out by The programming methods are acceptable provided they can be integrated into the
74 Mar-10-2021 Scope the manufacturer and is being replaced with a new unit.It uses Mar-24-2021 3
different programming methods.We need to get approval from the overall SCADA system as intended.
engineer to use the newer technology.

The cross crowder channel runs north and south along the east side of the new
75 Mar-10-2021 Scope In Area 50,how many cross crowder channels are there? Mar-12-2021 Adult Holding facility. This channel terminates at the interface with Area 50 at the 2
False Wier and EA basket.
There appears to be 6 raceways and 1 cross crowder channel in the
76 Mar-10-2021 Scope General Design Schematic(Vol 1,Sheet G-4)But on the Crowder Mar-12-2021 There are two cross crowder channel crowders due to the need to isolate the fish in 2
Network Diagram there are panels for 6 raceways and 2 cross both the upstream and downsteam directions within the cross crowding channel.
crowder channels(Vol 1,Sheet GI 5)
There are also some additional items on the Process Network
Diagram(Vol 1,Sheet GI 4)that are not detailed in any layout
drawings.Do you have more information on the following Network Diagram shows basic infrastructure for CCTV and LAN.VFD's are shown in
77 Mar-10-2021 Scope a.®CTV Control Station/DVR(Area 50) Mar-24-2021 3
b.8 VFDs(Area 50) their respective areas on Electrical and Controls plans and Division 16 Specifications.
c.Ilocal Access Network Patch Panel at TTB(area 60)
d.®VFDs(Area 60)
14.)Eor the Managers Zone Panel,Dorm Zone Panel and the Shop
78 Mar-10-2021 Scope and Storage Panel?These do not have a BOM,just a few notes on Mar-24-2021 SCADA Software And Hardware,Item 2,Sheet GI 4 specifies the requirements. 3
Sheet GI 4.We need more information on what is to be included.
On the MOXA—AWK-3131A Industrial wireless client-We need a
79 Mar-10-2021 Scope part number or more details on the external antennas,and the Mar-24-2021 These items are to be provided by the IT installer. 3
cables that are to be included.
It appears that information is missing from the Bill of Material for
the following panels
80 Mar-10-2021 Scope a.Eh volume 1 sheet GI 5,the Crowder Network Diagram shows Mar-24-2021 See answer to question 42. 3
several items such as a PLC,VSDs and network switch in each panel.
b.1h Volume 2 sheet 40110,the Typical Crowder Panel Layout does
not itemize any of those items in the Bill of Materials.
There are two panels that are listed in Volume 1 on sheet GI 4,Air
Burst Control Panel(in Area 20)and Chiller Control Panel(Area 60)
81 Mar-10-2021 Scope Mar-24-2021 See answer to question 43. 3
that are not listed in any of the other drawings,can you provide
more information on these panels?
It appears that the restroom,kiosk,and shade structures do not
have any fixtures,furnishings or equipment,is that correct?
82 Mar-10-2021 Scope Mar-12-2021 Yes,this is correct. 2
a.mhere are no plumbing or electrical services to any of these
structures,is that correct?
Theexisting adult holding ponds n matly 10 F1.Fenn with•12"thick
How deep is the existing Adult Holding Facility? •nFmm�.F n .nFn enn.n eF. nF minnn ti Vxn n not provided-
Based on
83 Mar-10-2021 Scope a.�ow thick is the concrete? Mar-24-2021 rn nnn .n � 3
historical drawings,the existing Adult Holding Ponds are approximately 8'deep but
b.®an you provide a structural as-built? will need to be Feld verified.The concrete is 8"thick.

The Ghmn ok raceways are approximately 6 N deep.Thee rete floors aFe
. The fall chinook
raceway start depth is 4.83'.The end depth is 5.33'and the outlet box is 7.33'deep
from the top of wall.The concrete wall thickness varies from 8"to 12".The footing
How deep are the existing raceways scheduled to be demolished? thickness is 12".
84 Mar-10-2021 Scope a.®ow thick is the concrete? Mar-24-2021 2 3
b2an you provide a structural as-built? The Abandoned raceways have a start depth of 4'and an end depth of about 4.34'.
The outlet box is 5.34'deep from the top of wall.The wall thickness is 7 5/8".The
footing thickens is 8".
All dimensions shall be Feld verified.
85 Mar-10-2021 Scope Is the use of slag allowed instead of fly ash? Mar-24-2021 Yes,the use of slag is allowed,provided the proposed mix design and test results 3
are acceptable to the Engineer.
One local concrete supplier is not in the Snake River drainage and as
a result the do not have any alkali Silica reactivity issues,however
86 Mar-10-2021 Scope the short test for ASR almost always shows a false positive test Mar-24-2021 No,the ASR and shrinkage spec can't be removed. 3
result. Can the ASR section be removed as it is impossible for them
to meet the shrinkage spec and the ASR on a remote location that is
2 hours from the batch plant.
Retarder with delayed set may be acceptable,subject to adequate testing,this must
With an addition of Delvo stabilizer as a dosage that results in a 3 include an early test slab placement.The test slab shall be placed at a location
87 Mar-10-2021 Scope hour delayed set,can the spec be changed to a 3 hour from plant to Mar-24-2021 determined by the Engineer. 3
pour versus a 90 minute spec? If the results are found to be satisfactory,the test slab may be integrated into the
project based on Engineer's discretion.
The field shrinkage test that is listed in the specs is a lab test only
88 Mar-10-2021 Scope and is not accurate per the concrete supplier and is not accurate Mar-24-2021 Shrinkage testing is not required for field cure specimens.The shrinkage limitations 3
with a field cure specimen. Can this spec be removed? shall only be verified for trial batch,following requirements of ASTM C157.
Raceway Gate Actuators
89 Mar-10-2021 Scope a.%/hat is the torque requirement? Mar-24-2021 See answer to question 73. 3
b.What is the stem dimension?
c.B there a mounting pad?
Raceway Level Transmitters—The model that was listed by the
engineer is being phased out by the manufacture and is being
90 Mar-10-2021 Scope replaced with a new unit. It used different programming methods. Mar-24-2021 See answer to question 74. 3
We need to get approval from the engineer to use the newer
technology.
In area 60,the chiller room gas monitoring system EF-x1000-T a.Refer to Mechanical drawings for duct sizes
(sheet GI 3)
91 Mar-10-2021 Scope a.What is the size of the duct? Mar-24-2021 b.0-10V 3
b.B it analog or BACnet,RS-485,or Modbus?
c.B analog,is single or dual output needed? c.Single output
92 Mar-10-2021 Scope Are you providing revised plan sheets to reflect the plan changes Mar-24-2021 Updates will be provided in the Conformed Documents for construction. 3
listed in Addendum 01?

Refer to Sanitary Sewer Lift Station Specification 11076,What is the The wet well material shall be concrete or fiberglass.Other materials may be
93 Mar-10-2021 Scope required wet well material?Is concrete acceptable? Mar-24-2021 reviewed during the submittal review process. 3
Sheet GI5 indicates that each Crowder Control Panel is to include a
Platform VFD,Crowder VFD,PLC,Network Switch,and Radio.The
95 Mar-10-2021 Scope Crowder Control Panel Design on sheet 40110 does not include any Mar-24-2021 See answer to question 42. 3
of these devices.Please clarify the design intent for these control
panels.
P&ID sheet G-4 near the Adult Holding Raceways displays V-40.1&
40.2 as motor operated valves with sizes to be unclear,assume 12" V 40.1-V 40.12 shown on GM-3 and 40 M 2 are correct and reference the 4"
butterfly. Sheet 40-1-1&GI-3 for the instrumentation schedule isolation valves on the spray nozzle system.
concur with sheet G-4. However sheet GM-3 for the Valve Schedule
displays valves 40.1&40.12 as 4"butterfly valves and V 40.2 On G-4,GI-3,40 11,and 50 M 2 V-40.1 and V-40.2 shall be changed to V-50.31 and
96 Mar-10-2021 Scope Mar-24-2021 3
through 40.11 as 6"butterfly valves all with 2"manual operator V-50.32 respectfully.See answer to question 49 for final sizes.
nuts. Sheet 40-M-2 Raceway Plan and Details show valves 40.1-
40.12 as 4"butterfly valves without indication of manual or motor Further,on Sheet 50M9,the three 4"diameter buried butterfly valves should
operator. Please clarify the valve sizes and operators for valves 40.1 reference V-50.33,V-50.34,and V-50.35 in the valve schedule.
through 40.12
Area 50(Sheet 50 1 20)—SB-LCP panel—AVEVA—tcnd2U-19ac-LN2C
—Intouch panel PC:compact 19"has been discontinued. The
97 3/12//2021 Scope following are two option. Please advise. Mar-24-2021 Option A with equivalent size touchscreen. 3
a.A PC with a wonderware license
b.01odicon touchscreen(may not be able to get bigger than 15")
98 Mar-12-2021 Scope 2.13 the new intake structure in the exact same location as the Mar-12-2021 The new structure is in the same general location as the old structure. The new 2
existing structure?Are the piles in the exact same locations? piles are not in the same location as the old piles,
The type G aggregate underneath the asphalt is not defined in the
99 Mar-12-2021 Scope Mar-24-2021 See Specification 02513 Section 2.1 Aggregate Base. 3
specifications.Please provide a gradation for this aggregate.
The specifications require an AISC certification for steel
100 Mar-12-2021 Scope/Specifications manufacturers.Can this certification be waived for metal Mar-24-2021 No,the certification can't be waived. 3
fabrications?

The Protective Coatings Spec lists epoxy in Mud Room walls and
101 Mar-12-2021 Scope/Specifications concrete floors,and the room finish schedule list this as penetrating Mar-24-2021 The finish schedule provided on GA-9 is correct for all areas. 3
sealer. Can you confirm which is correct?
102 Mar-12-2012 Scope What areas are to receive penetrating concrete sealer and is there a Mar-24-2021 Penetrating concrete sealer shall be used where noted on the GA-9 finish schedule. 3
manufacture/product specified? Sikagard 740 W or similar can be used as penetrant sealer.
Facts/References:.Sheet G-4 for the P&ID shows valves V 60.9 as an
unknown size near the chiller(assumed in the chiller room),V 60.10
as a 6"butterfly assumed in the Incubation Room,and V 60.11 as a valves thou V-60.3 AND V-60.52 as shown
are 4"diameter isolation and check
8"butterfly assumed in the Incubation Room. •Sheet G-4 also valves around P-60.1 and P-60.2 as shown on 60M4.
shows V 60.10 as being installed on a 6"CGW line where other V-60.4 and V-60.9 are 4"isolation valves on the heat excanger as shown on GH8.
places it is called as an 8"such as sheet 60-M-2.•In contradiction to
103 Mar-12-2021 Scope G-4,Sheet 60-M-2 Section C shows valves V 60.9 as a 6"butterfly Mar-24-2021 V-60.8 is a 4"valve located in the chiller room,just above key note 7 on 60M5. 3
valve and V 60.10 as an 8"butterfly valve in the Incubation Room. V
60.11 is not shown on this sheet.•Sheet GM-3 Valve Schedule lists
V 60.9 as an unknown size butterfly valve in the chiller room,V V-60.10 and V-60.11 are meant to be the isolation/control valves for the chilled and
V 60. as a 6"butterfly in the Incubation Room,and chiller
room,
as V 8" ambient ground water piping.V-60.10 is a 6"diameter valve on the CGW line,and V-
butterfly in the Incubation Room. Please clarify the valve this. is a 8"diameter valve on the GW line.Change the callouts on 60M2 to reflect
locations,sizes,and system installations for valves 60.1 through this.
60.11
Facts/References:-Sheet 60-M-5 Chiller Plan shows 6 pumps(P 60.1
thru 60.6).•Sheet GM-3 Pump Schedule only lists P 60.1&P 60.2 for All pumps shown on GH-8 are required.Schedules for P-60.3 thru P-60.6 are
104 Mar-12-2021 Scope Mar-24-2021 3
the chiller,no other pumps which is contradiction to sheet 60-M-5. provided on GH5.
Please clarify the number of pumps for the chiller system.
Sheet 10E4 is a single line diagram for the Area 10 equipment.Can The single line diagram on 10 E 4 shows electric panels for the entire hatchery,not
105 Mar-12-2021 Scope Mar-24-2021 3
similar single line diagrams be provided for the rest of the facility? just Area 10.See sheet GE 4 for panel schedules.

Sheets 50118 and 50119 provide detailed VFD wiring diagrams for
BRAIL-50.1-VFD,FHT-50.1-VFD,MHT-50.1-VFD,and FBE-50.1-VFD.
Can motor sizes and similar wiring diagrams be provided for the
following VFDs:
•P-10.1&P10.2 VFDs Drawing GM-3 provides sizes for all motors in question.The crowder motors and
106 Mar-12-2021 Scope •P-10.1&P10.2 VFDs Mar-24-2021 VFD details shall be provided by the crowder system integrator/manufacturer.For 3
•Crowder 1-6 Platform VFDs the remaining VFDs,see specification 16265 for VFD wiring and requirements.
•Crowder 1-6 Crowder VFDs
•Cross Crowder 1-2 Platform VFD
s•Cross Crowder 1-2 Crowder VFD
s•P-50.1,P50.2,P50.3&P50.4 VFDs
•P-60.1&P60.2 VFDs
107 Mar-12-2021 Scope Please provide water elevation and flow historical data at or nearby Mar-24-2021 See Addendum 03-Attachment 04-HEC RAS Model 3
the Oxbow intake structure.
At the site visit,the Idaho Power Representative stated that the
108 Mar-12-2021 Permits permit for river intake construction had not yet been approved. Mar-12-2021 Permit will be provided to contractor upon reciept. IPC is in the pre-application 2
phase.
What is the status of the permit?
At the site visit,the Idaho Power Representative stated that the
permit for river intake construction had not yet been approved.Will IPC has not yet finalized the permit for this work. It is IPC's intent to apply for the
109 Mar-12-2021 Permits the permit allow the contractor to install a cofferdam or place Mar-12-2021 permit after the contractor has been selected and the permit application can be 2
temporary fill material into the river below the ordinary high water adjusted based on the needs of the contractors.
line?
Read Section III Requirements&Clarifications,D.Performanceand/or Payment
110 Mar-16-2021 Bonds Is IPC requiring bid bonds for the Oxbow RFB? Mar-16-2021 Bonds of the RFP document and Section 19 of the Project Construction Agreement 3
(last paragraph)

Refer to specification section 11425-5 2.5H.Manufacturers,or
equal:1.Transco Industries,Portland,OR,2.Con-Vey,Roseburg,
OR,3.Jesse Co.,Tacoma,WA.All three listed suppliers have
declined to bid the project.Some suppliers have commented that It is acceptalbe to use alternative manufacturers to those listed in the specifications.
they will have a hard time bidding due to the fact that there is no The manufacturer shall have experience in manufacturing equipment of similar
completed design and they don't handle design.We have other complexity,size and to industrial standards. Alternative designs for the fish
111 Mar-17-2021 Supplier fabricators in mind but they may or may not meet your Mar-24-2021 handling equipment that represent significant departures from those described in 3
the Contract Documents are not acceptable. Minor variations that refine the
requirements because the requirements are not listed. equipment will be considered and allowed as long as they represent improvements
-Please provide direction on how to proceed.(what suppliers will and the intended function of the equipment remains intact.
be accepted)
-Will Idaho Power consider alternative designs for the fish handling
equipment?and how should we propose alternative designs?
Refer to Specification 05120 1.2 B"Steel fabricator:Minimum of 5
years'
experience in fabrication of structural steel and shall be certified
under AISC Quality Certification.&a.Use a professional engineer on The AISC Quality Certification cannot waived.
112 Mar-17-2021 Supplier fabrication staff."We have reached out to several steel fabricators Mar-24-2021 A professional engineer does not have to be on staff,but shall review and stamp 3
who fabricate products for fish hatcheries and other similar any contractor designed items.
facilities.Many of them do not have AISC certifications.Could this
certification be waived for structural steel fabrication as long as the
drawings are reviewed and stamped by a professional engineer?
Refer to Specification 05120 1.3 A2a"Prepare Shop Drawings under
113 Mar-17-2021 Specification National Institute of Steel Detailing Quality Procedures Program Mar-24-2021 Yes,this requirement can be waived. 3
certification."Can this certification be waived?
The following product is provided as an acceptable standard of quality for acoustical
There is no acoustical panel ceiling or suspended metal grid panel ceilings:
114 Mar-19-2021 Specification specification however it is a required finish on the architectural Mar-24-2021 3
drawings. Armstrong"Cirrus"beveled tegular edge,2'x2'on a 15/16"white grid.Tile color
white,item 584.
Per 05500,2.1,B,please define areas of the project that are The referenced paragraph applies to miscellaneous metalwork,and a"corrosive
considered a'corrosive environment'or'humid environment'as this environment"is defined as a location where the metalwork is submerged or has the
115 Mar-19-2021 Specification Mar-24-2021 ability to be submerged during normal operations.This project does not have any 3
drives the protective coating requirement.Please clarify where areas considered a"humid environment".We note that all structural steel shall be
protective coatings per 09910 will be required. coated per System(4)in Specification 09910.

Irrigation Tank
a.Does the irrigation tank need to meet the AWWA D100 Potable
water tank code?
b2his tank does not show a sidewall many. For fabrication and
coating application this will need a 24"manway added. Please
confirm this is acceptable. Irrigation Tank
i
co t interior ladder needed for access from the roof hatch? a.RWWA Potable Water Code is not required for Irrigation Tanks
116 Mar-12-2021 d.On the exterior ladder,new OSHA regulations require ladders to Mar-29-2021 c.lNb.N side entry adder is is dead. ble 4
have a fall prevention system,such as a Miller Vi-Go or 3M DBI-Sala d2l interior Ladder is needed.
Ladder Fall Prevention Cable System. Does this need to be included d.0lease provide the fall protection as required.
e.1904SS Ladder is acceptable in place of Galvanized Ladder.
with this tank and ladder assembly orjust the OSHA Rated Fall-
Restraint Tie-Off Point on the Roof of the Tank?
elan we offer a 304SS Ladder,rather than the galvanized ladder
that the specifications call for? The 304SS Ladder construction is
actually more cost effective than a galvanized ladder.
Specification
The Polymer Valve Box that is between the Raceway channel(Detail 260
117 Mar-12-2021 GC4 Section B referenced on 40-M 2)is not available in the size required, Mar-29-2021 Please provide an alternative to the Polymer Valve Box that is specified 4
and cannot be made this small. Please provide an alternate product or
for a case in place solution.
Specification
The sanitary sewer lift station shown on sheet 10 C 5 has no details in the
118 Mar-12-2021 plans or specifications.Please provide sufficient information to price out Mar-29-2021 See Specification 11076 provided in the Bid Documents 4
this scope of work,including:lift station dimensions,pump requirements
and mechanical design.
Specification
It is our understanding that for the flow required of the intake pumps,the
Hydraulic Institute recommends that a physical model study be
119 Mar-12-2021 performed to show that the equipment will be able to reach their Mar-29-2021 A Physical Model is not required 4
designed flow.Has such a study been done?Will such a study be required
Design of the contractor?
Pump P-20.3 is incredibly low flow for the size and RPM,requiring
operation on an extreme point on a curve that is not recommended. The 450 ft TDH is required to provide water to the irrigation tank above the Idaho Power
120 Mar-12-2021 Mar-29-2021 offices.The specified speed and flow characteristics may be adjusted somewhat to provide 4
Would a smaller pump or higher RPM be acceptable. Both would be ideal P p Y J
in order to provide a pump that can sustain long term operations. a suitable pump selection,however final approval is dependent on the Engineer's review of
the pump and system curves.
A Geotech report is mentioned in multiple locations and needed to
meet the requirements for the intake structure. Has one been
performed? If not,will the contractor be required to perform one
or will Idaho Power? A Geotech report was included in Addendum 01
121 Mar-12-2021 a2loor Type Fl calls for 4"compacted fill per the Geotech report, Mar-29-2021 a.®"compacted fill is required for Floor Type Fl. 4
please clarify if this is required. b.95%compaction is required for Floor Type F1
bAloor Type F1 calls out 95%compaction,but 92%compaction is
called out in other places. What are the site and under building
compaction requirements?

The overhead door specification section,08362,2.2,G.calls
out guide angles and wall assemblies to be stainless steel. The table 2.4
122 Mar-12-2021 calls out Ferrous Steel,shop coat primer and field paint for these same Mar-29-2021 Coated Ferrous Steel or SS will be acceptable 4
pieces. Stainless steel is available,but at significant added cost,will
coated Ferrous Steel be acceptable?
Concrete:
a.133310-6,2.4,D.)Fly Ash availability is currently very volatile,and
potentially limited it availability.Will the owner consider 15%fly ash
in lieu of 25%requirement? Will the owner consider slag in lieu of
fly ash? (also mentioned 03310-11,2.9,B.,3.)
b.133310-13,3.1,A.,2.) Dry Shrinkage Tests—In our experience,field
Concrete:
testing for concrete shrinkage is inaccurate compared with lab
testing. Please allow lab testing at specified intervals. a.®lag is acceptable lieu of Fly Ash
03310-12,2.13,B.,)Specified concrete discharges of 45 minutes to b.®hrinkage testing is not required for field cure specimens.The shrinkage
123 Mar-12-2021 60 minutes are not possible from currently operation plants,and do Mar-29-2021 limitations shall only be verified for trial batch,following requirements of ASTM 4
not account for mixes containing admixtures used to control set c.Del
times. Please consider revising to allow 3 hour controlled set times. c.Delayed set additives such as Delvo are acceptable
d.
d.®3310-13,3.1,B.,3.) Alkili-Silica Reactivity Limitations—ASR ASR requirements are not removed.
inhibitors and shrinkage reducing admixtures do not react well e.lE a®set of cylanders per 100 CY,minimum of 1 set per pour
together when combined over long periods of travel time,please
consider removing the requirement for ASR testing and ASR
inhibitor admixtures.
e.133310-4,1.4,C.,1.) Please specify concrete compression test
specimen intervals.

ID p Task Task Name Duration Start 0 Half 1,2021 Half 2,2021 Half 1,2022 Half 2,2022 Half 1,2023 Half 2,2023 Half 1,2024 Half 2,
V Mode O 1 N I D J I F I M I A M I J J I A I S 10 1 N I D J I F I M I A I M I J J I A I S 10 1 N I D J F M A M J J A S O N D J F M A M J J A
1 W$ Oxbow Hatchery Renovation Anticipated Schedule 787 days Mon 11/9/20
2 ® W. Design Complete 1 day Tue 12/15/20 Design Complete
3 Permitting and Clearances 350 days Mon 11/9/20 1 Permitting and Clearances
4 RFB 155 days Mon 11/9/20
5 Bid Docs 145 days Mon 11/9/20 Bid Docs
6 Bid Date 1 day Fri 5/28/21 Bid Date
7 ® W. Award Contract 1 day Fri 6/11/21 Award Contract
8 Pre-Construction Tasks 310 days Thu 7/1/21
9 ® t:� Value Engineering 50 days Thu 7/1/21 Value Engineering
10 Submittals 300 days Thu 7/15/21 Submittals
11 Gravel Production 150 days Mon 8/2/21 Gravel Production
12 Preliminary Procurement 200 days Mon 8/2/21 Preliminary Procurement
13 Outages/Key Dates 381 days Mon 5/2/22
14 ® W. Well/Incubation Outage 55 days Mon 5/16/22 Well/Incubation Outage
15 Intake/Ponds Outage 120 days Mon 5/2/22 Intake/Ponds Outage
16 Well/Incubation Outage 77 days Tue 11/1/22 Well/Incubation Outage
17 Well/Incubation Outage 55 days Mon 5/15/23 Well/Incubation Outage
18 ® W. Intake/Ponds Outage 76 days Mon 7/3/23 Intake/Ponds Outage
19 Anticipated Construction Window 456 days Tue 2/15/22 1
20 Mobilize 1 day Tue 2/15/22 Mobilize
21 ® W. Demo old Raceways (not ponds) 30 days Tue 3/1/22 Demo old Raceways (not ponds)
22 ® W. Civil and Yard Piping 414 days Tue 3/1/22 Civil and Yard Piping
23 ® W. New Adult Holding Building 414 days Tue 3/1/22 New Adult Holding Building
24 Sorting and Spawning Building 414 days Tue 3/1/22 Sorting and Spawning Buildino.
25 Warehouse Building 414 days Tue 3/1/22 Warehouse Building
26 Aeration Tower 414 days Tue 3/1/22 Aeration Tower
27 Chiller, Incubation, and Office Building 252 days Tue 3/1/22 Chiller, Incubation, and Office Building
28 Demo Existing Incubation 77 days Tue 11/1/22 Demo Existing Incubation
29 *Chiller Commissioned Milestone 0 days Wed 2/15/23 ♦ 2/15
30 Intake Structure Window 120 days Mon 5/2/22 Intake Structure Window
31 Commission Intake 0 days Fri 10/14/22 ♦ 10/14
32 Demo Adult Ponds (Early Start) 66 days Mon 7/3/23 Demo Adult Ponds (Early Star
33 Finish Site Work 131 days Tue 5/2/23 Finish Site Work
34 Substantial Completion 0 days Mon 10/16/23 ♦ 10/16
35 Final Completion 0 days Wed 11/15/23 ♦ 11/15
Task Project Summary Manual Task 1 0 Start-only C Deadline
Project:Anticipated Constructio Split ................... Inactive Task Duration-only Finish-only ] Progress
Date:Wed 4/28/21 Milestone ♦ Inactive Milestone Manual Summary Rollup External Tasks Manual Progress
Summary Inactive Summary Manual Summary External Milestone
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ID Task Task Name IDuration Start Finish 0 Half 1 2021 Half 2,2021 Half 1 2022 Half 2,2022 Half 1 2023 Half 2,2023 Half 1,2024 Half 2,
0 Mode O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M I A I M J J I A
1 !} Oxbow Hatchery Renovation Anticipated Schedule 787 days Mon 11/9/20 Wed 11/15/23
2 Design Complete 1 day Tue 12/15/20 Tue 12/15/20 Design Com Aete
3 !} Permitting and Clearances 350 days Mon 11/9/20 Fri 3/11/22 F ■ Permitting and Clearances
4 RFB 155 days Mon 11/9/20 Fri 6/11/21 0 0
5 Bid Docs 145 days Mon 11/9/20 Fri 5/28/21 Bid Docs
6 ® !.y Bid Date 1 day Fri 5/28/21 Fri 5/28/21 Bid Date
7 Award Contract 1 day Fri 6/11/21 Fri 6/11/21 Award Contract
8 Pre-Construction Tasks 310 days Thu 7/1/21 Wed 9/7/22
9 ® !.f Value Engineering 50 days Thu 7/1/21 Wed 9/8/21 Value Engineering
10 Submittals 300 days Thu 7/15/21 Wed 9/7/22 Submittals
11 Gravel Production 150 days Mon 8/2/21 Fri 2/25/22 Gravel Production
12 Preliminary Procurement 200 days Mon 8/2/21 Fri 5/6/22 Preliminary Procurement
13 Outages/Key Dates 381 days Mon 5/2/22 Mon 10/16/23 0
14 Well/Incubation Outage 55 days Mon 5/16/22 Fri 7/29/22 Well/Incubation Outage
15 Intake/Ponds Outage 120 days Mon 5/2/22 Fri 10/14/22 Intake/Ponds Outage
16 Well/Incubation Outage 77 days Tue 11/1/22 Wed 2/15/23 Well/Incubation Outage
17 Well/Incubation Outage 55 days Mon 5/15/23 Fri 7/28/23 Well/Incubation Outage
18 Intake/Ponds Outage 76 days Mon 7/3/23 Mon 10/16/23 1 1 take/Ponds Outage
19 !� Anticipated Construction Window 456 days Tue 2/15/22 Wed 11/15/23 0
20 Mobilize 1 day Tue 2/15/22 Tue 2/15/22 Mobilize
21 Demo old Raceways (not ponds) 30 days Tue 3/1/22 Mon 4/11/22 Demo old Raceways (not ponds)
22 Civil and Yard Piping 414 days Tue 3/1/22 Fri 9/29/23 Civil and Yard Piping
23 New Adult Holding Building 414 days Tue 3/1/22 Fri 9/29/23 ' New Adult Holding Building
24 Sorting and Spawning Building 414 days Tue 3/1/22 Fri 9/29/23 Sorting and Spawning Buildi
25 Warehouse Building 414 days Tue 3/1/22 Fri 9/29/23 -nN Wi rehouse Building
26 Aeration Tower 414 days Tue 3/1/22 Fri 9/29/23 Ae ation Tower
27 Chiller, Incubation, and Office Building 252 days Tue 3/1/22 Wed 2/15/23 Chiller, Incubation, anc Office Building
28 Demo Existing Incubation 77 days Tue 11/1/22 Wed 2/15/23 Demo Existing Incubation
29 *Chiller Commissioned Milestone 0 days Wed 2/15/23 Wed 2/15/23 O 2/15
30 ® !o Intake Structure Window 120 days Mon 5/2/22 Fri 10/14/22 Intake Structure Window
31 Commission Intake 0 days Fri 10/14/22 Fri 10/14/22 O 10/14
32 Demo Adult Ponds (Early Start) 66 days Mon 7/3/23 Mon 10/2/23 Demo Adult Ponds (Early Sta
33 ® !.■ Finish Site Work 131 days Tue 5/2/23 Tue 10/31/23 Finish Site Work
34 Substantial Completion 0 days Mon 10/16/23 Mon 10/16/23 1 0/16
35 Final Completion 0 days Wed 11/15/23 Wed 11/15/23 E; 11/15
Task Project Summary I Manual Task Start-only E Deadline
Project: Anticipated Constructio Split Inactive Task Duration-only Finish-only 7 Progress
Date: Tue 5/18/21 Milestone A Inactive Milestone Manual Summary Rollup I External Tasks Manual Progress
Summary Inactive Summary Manual Summary External Milestone O
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RM
i2�POMR.
An IDACORP Company
ADDENDUM NO. 1
to the
Contract Documents
for the
Oxbow Hatchery Renovation Construction Project
This Addendum,dated February 26,2021,is for all persons preparing bids for the above referenced project and
as such, shall be made a part of the Contract Documents.
All changes,corrections,deletions, and/or additions to the initial bidding documents enumerated herein shall be
included in the Respondent's Proposal. In case of any conflict between the Drawings, Specifications, and this
Addendum,this Addendum shall govern.
The Respondent shall acknowledge the receipt of this Addendum in the appropriate place on the Bid Schedule.
Failure to acknowledge the receipt of the Addendum will cause a Bid to be considered non-responsive.
See the following documents with upload date of 2/26/2021 that provided additional information/response to
submitted questions and pre-bid identification of buried communications line.
1. Oxbow Hatchery Renovation Project-Addendum 01 —Attachment 01 —Drawings and Specification
Modifications Narrative (zip file)
a. 10 C 9 Rev 1
b. 02455 Drilled and Cast Piles—Rev 1
2. Oxbow Hatchery Renovation Project-Addendum 01 —Attachment 02—Construction Sequencing
3. Addendum 01 —Attachment 03—Civil CAD Files(zip file)
4. Addendum 01 —Attachment 04—Background Drawings(zip file)
a. Historical Utility Plan
b. Dorm Sanitary Sewer As-Built
c. 2013 Intake Structure Modifications
d. Owner Furnished Tee Screen
5. Addendum 01 —Attachment 05—Oxbow Hatchery Renovation Project Schedule of Values v2—2-22-
2021
END OF ADDENDUM NO. 1
Idaho Power Company
P.O. Box 70
Boise, ID 83707
Oxbow Hatchery Renovation Construction Project
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