20080730DEQ Letter to EAG.pdf

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STATE OF IDAHO
DEPARTMENT OF
ENVIRONMENTAL QUALITY
1445 North Orchard · Boise, Idaho 83706 . [phone] CL "Butch" Otter, Governor
Toni Hardesty, Director
July 25, 2008
Mr. Robert DeShazo
Eagle Water Company
P.O. Box 455
Eagle, il 83616
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Subject:New connections now allowed
Dear Mr. DeShazo:
DEQ has approved the plans and specifications for the intertie between Eagle Water Company
(EWC) and the City of Eagle water systems. That connection has been made and inspected, and
the system models have shown that both EWC's system and the City's system can operate within
Idaho Rules for Public Dring Water System (IRDWS) requirements with this intertie in
place.
This improvement to the EWC water system satisfactorily addresses Action Item A.3.a in our
letter to you dated July 6, 2007 concernng satisfyng IRDWS pressure and flow requirements
for the existing system with the largest source out of servce. The improvement also relieves
servce connection restrctions set forth in Items B.3 and B.5 ofthe July 6, 2007 letter.
Although longer term connections to EWC wil stil depend on the completion of a new water
source as set forth in the July 6, 2007 letter, in the near term there is suffcient pressure, quatity
and redundacy to allow new connections to EWC now, specifically allowing new connections in
the EWC high pressure zone.
Ths means that new subdivisions that have been waiting to have santar restrictions lifted to
begin the building permt process can now ask DEQ to recommend the lifting of santary
restrictions on their subdivisions. Additionally, the connection can be made to Floating Feather
Mobil Home Park.
If the agreement between EWC and the City of Eagle is termnated for any reason, and the intertie
is disconnected or altered prior to EWC having suffcient other sources on line, DEQ may
reimpose santar restrictions on any and all affected connections or subdivisions.
The modeling results suggest that system pressure in a substantial par of your distribution system
could exceed 80 pounds per square inch (psi) when the intertie is activated, and may exceed 100psi at a few locations. EWC is reminded ofthe requirements oflRDWS § 552.0L.b.iii with
regard to the management of high pressure. Once the intertie is activated, EWC should conduct
sureys and measurements as required to determne actual system pressures and then take
appropriate action as mandated by IRDWS (i.e., individual pressure reducing valves at servces
over 100 psi). Also, if pressures at servces increase to over 80 psi, public notification is required
.'
Mr. Robert DeShazo -letter
July 25, 2008
Page 2
by Eagle Water Company. Finally, we understand that from the Idaho Division of Building
Safety, Plumbing Bureau that substantial chages in pressure, regardless of the final pressure,
could result in home flooding (from hot water tank pressure relief valves). We recommend
notification in those situations as well.
If you have any questions, please contact me at the email or phone number listed below.
Sincerely,
"i~c) ~~
Mark Mason, P .E., Engineering Manager
Idaho DEQ - Boise Regional Offce
1445 North Orchard
Boise, il 83706
208-373-0266
mark.mason(ideq .idaho.gov
MM:cm g:\engineerng\mark mason2008\ewc72508 intere and connection appoval.tr
cc: Pete Bair, P.E., DEQ
Monty Marchus, P.E., DEQ
Brandon Lauder, DEQ
Tiffany Floyd, DEQ
Jim Rees, P.E., MTC Engineers
Vern Brewer, Holladay Engineerig
Kasey Ketterling, P.E., Holladay Engineering
Courney Beebe, State Attorney General's Offce
Susan Buxton, Att2~~;y,J()rSity o.f. Eagle
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