20221027Gem State to Staff 47-53_Attachment 47-11 Diamond Bar Estates - FY20 ESS narrative.pdf

Gem State – Diamond Bar Estates, ID1280268 2020 Drinking Water Supply Report
Idaho Department of Environmental Quality Field Inspection Date March 10, 2020
System Representatives Leslie Abrams, Responsible Charge Operator Surveyed by Suzanne Scheidt, Senior Drinking Water Analyst Available Sources Well 1 (Primary), Well 2 (Emergency) Population 138 Service Connections 55 residential connections

A photographic log is enclosed with the narrative report. System History and Overview
The Diamond Bar Estates water system (system) is under ownership and operation of Gem State
Water Company, LLC. System engineering plans were submitted to the Idaho Department of Environmental Quality (DEQ) by Jeff Block, P.E., on behalf of developer Robert Turnipseed in September 1995. Water system
plans including wells, tank and distribution main serving the system were approved by DEQ in
February 1996. The system was first inspected in 1996 and community public drinking water supply population criteria met in 2001. In January 2005, plans submitted by Roger Glessner were approved by DEQ for an 8-inch main
extension from the 6-inch main on Atlas Road to serve the 14 lot Boekel Estates residential
subdivision on CJ Court. System ownership was transferred from Diamond Bar Estates Limited Liability Corporation (established 2003) to Gem State Water Company, LLC on October 1, 2019.

The system is primarily supplied by well 1 (E0009134). Well 2 (E0009135) functions as an emergency backup source. Wells draw from the Rathdrum Prairie Aquifer. Well 1 discharges directly to the 55,000 gallon concrete ground level tank via pitless adaptor and is not plumbed to discharge to pressure. Under routine operation, two booster pumps operating in lead/lag lift water
from the tank to pressurize distribution main. A third booster pump provides fire flow. The well,
booster pumps and storage tank are constructed on a 1.18 acre lot located at 13919 Rodeo Road, Rathdrum. The lot is owned by Gem State Water Company, LLC (Parcel Number 0-1774-001-999-0). Well 2 is drilled on a 59 acre lot (Parcel Number 51N04W-03-3500) owned by Robert Turnipseed on Atlas Road and plumbed for discharge to pressure via 6-inch Class 160 PVC main.

Chlorination is neither required nor provided. The system is working toward installation of a primary logic controller with SCADA remote relay within the year.

Diamond Bar Estates PWS Overview Source Information
The Idaho Department of Water Resources (IDWR) website indicates two water rights shared between wells 1 and 2 have been allocated with a priority date of November 29, 1965. Water Right No. 95-10068 provides for a municipal beneficial use of 2.7 cubic feet per second (cfs) or 1211 gallons per minute (gpm). Water Right No. 95-10067 provides an irrigation beneficial use between
April 1 and October 31 with diversion rate of 1.3 cfs or 583 gpm. A transfer of IDWR’s water right for well 1 has been filed and scheduled for processing following final adjudication. Setback distances from potential contamination sources are met at well 1. As per the Asset Purchase Agreement between Robert Turnipseed and Gem State Water, a one year agreement provides for use
and access to well 2 expires July 31, 2020. On January 31, 2020, a well site evaluation report was submitted to DEQ for a planned replacement well to be drilled on the current lot where well 1 is located. The well site field evaluation was conducted during the survey inspection. Written DEQ approval of the well site was provided to Gem
State on March 10, 2020 (EDMS# 2020AGD1133). Source water assessment delineation reports for the primary and emergency well were completed by DEQ in June 2013 and updated in January 2020. Individual reports for both sources may be accessed at: http://www2.deq.idaho.gov/water/swaOnline/Search

CJ Court (equipped with dead end flushing hydrant)
Emergency well
Well, pump building and tank

Well 1, Storage Tank and Booster Pumps
Well 1 was drilled by Holman Drilling Corporation of Spokane, Washington in 1966 for irrigation use. Well 1 was later converted from an oil-lubed irrigation well and equipped with a 60 horsepower (hp) submersible pump producing approximately 570 gpm. The Driller’s Report on file indicates the 16-inch cased well was cable tool drilled to a depth of 373
feet below ground surface (bgs) and constructed with a 94 foot bentonite surface seal. The well is equipped with telescoping screen from 342 to 373 feet. The lithologic log indicates the well was drilled through multiple layers of sand, gravel and boulders with a blue clay lens encountered between 324 and 332 feet. Static water level was reported at 298 feet bgs.
Well 1 is centered on the fenced well lot. A 24-mesh screened mushroom cap vent is installed off the well cap. Well actuation set points are based on tank float system. Well 1 discharges via pitless adaptor through the tank and pump building floor to the 55,000 gallon partially buried rectangular concrete tank. The pitless adaptor enters through the pump building floor
via 4-inch galvanized main. Well 1 discharge may be isolated and routed to waste prior to the tank. It is required that the retro-fit discharge to waste is routed away from the tank during system upgrades. A Kent instantaneous and totalizing flow meter (reading 36,439,200 gallons) and smooth nose raw water sample tap are installed on 4-inch galvanized line prior to tank discharge.
The 55,000 gallon concrete storage tank is constructed below the pump building. A partial baffle wall between well discharge and booster pump suction lines provides structural building support. The tank access hatch is within the locked pump building and equipped with an internal gasket. Small holes in the hatch are required to be sealed and evaluated as a system deficiency. An adequately screened combined overflow and vent is installed; however, is not downturned and also
evaluated as a deficiency. As the system is undergoing major modification, a separate vent must be installed and overflow equipped with weighted flapper to prevent dust from entering the tank. Please provide written timeline for correction within 30 days of receipt of survey report.
Two 5 hp submersible pumps actuated in lead/lag draw from the tank to pressurize distribution
between 38 and 60 psi under normal operation. A third 10 hp fire pump actuates on a 35/60 psi switch provides fire flow. Boosted discharge appurtenances include: sample tap, isolation valves and pressure relief valve (opens at 75 psi). The relief valve is required to be routed to atmosphere.
It is strongly recommended that flow meter and pressure transducer are installed on boosted
discharge and communicate with planned PLC and SCADA components to allow for remote oversight. A control valve on boosted discharge is regularly maintained by a third party contractor. Significant pipe corrosion was apparent in the pump building, and some isolation valves were
inoperable. This is evaluated as a deficiency. The operator plans to install a dehumidifying system,
remove corrosion and ensure valve actuation. Please provide a timeline for correction within 30 days of receipt of survey. Five 119 gallon Well X-trol hydropneumatic bladder tanks ride on boosted discharge to distribution.
Tanks are equipped to be individually isolated and drained. Threaded hose bibb drains are equipped
with atmospheric vacuum breakers. A second sample tap on boosted discharge is downstream of

hydropneumatic tanks. The bladder in tank number four was found to have failed. The tank has been valved off (isolated) and the operator has scheduled for replacement by March 31, 2020.
Pump building floor drains gravity discharge through the tank to daylight on the east side of the pump building. Well 2
As previously indicated, well 2 is located approximately 2,300 feet west-northwest of well 1 on private property and enclosed within a locked, heated and ventilated pump building. Prior survey reports indicated a dedicated well lot needs to be created for the well in the event Mr. Turnipseed sells or transfers property ownership.
A Driller’s Report is not available for the well; however, a pump installation report by Dickerson Pump and Irrigation Company (1990) indicates the 8-inch cased well was drilled by Hollman Drilling Corporation to a completed depth of 373 feet in 1975. A static water level of 295 feet was indicated on the Dickerson report. Well 2 is reportedly equipped with a 15 hp submersible Berkeley pump; the
well pump curve provided by United Crown Pump and Drilling in 2015 indicates a maximum production rate of 95 gpm. Well 2 discharges off the well cap through 2-inch galvanized water line. A pressure relief valve and smooth nosed sample tap are installed on well discharge appurtenances within the well building. A
2-inch galvanized tee discharges through an instantaneous and totalizing flow meter to supply the residential connection. Supply to the Diamond Bar Estates system is provided via manual actuation of a gate valve on well discharge appurtenances within the well building. A separate instantaneous and totalizing flow meter is installed on discharge to the Diamond Bar Estates distribution system.
Well operation is controlled by pressure switches installed off the 600 gallon hydropneumatic pressure tank. The tank appeared to be structurally sound with water levels monitored via sight glass. The tank is equipped with a pressure relief valve; air to the tank is supplied by an electric compressor.

Well 2 discharge routes to distribution main on Atlas Road, an isolation valve on well discharge is located on the Turnipseed property. The valve was located during the survey and discussion between operators indicated a valve access easement would be created as required to ensure access to all water system distribution components.

Distribution System The distribution system serves 55 metered residential connections. Water mains are constructed of class 160, 6- and 8-inch pipe providing service to Diamond Bar Avenue, Ramsey Road (between
Diamond Bar Avenue and Boekel Road), and Atlas Road from Boekel to the main loop on Rodeo
Road. A 6-inch Class 160 PVC main runs north on Atlas under Boekel Road to supply CJ Court (Boekel Estate) via 8-inch Class 160 PVC main. A flushing hydrant on 8-inch main dead end main is required to be flushed twice per year.
According to Tyler Drecshel, Fire Inspector with Northern Lakes Fire District, the water system
meets fire flow requirements.

Required Depressurization Response
The Idaho Rules require the following response to distribution depressurization as per IDAPA 58.01.08.552.01.b.ii.1 - 2: during unplanned or emergency situations, when water pressure within the
system is known to have decreased below 20 psi, the water supplier must notify DEQ, provide public notice to affected customers within 24 hours and flush and/or disinfect the system. When sampling and corrective procedures have been conducted, the water supplier may re-notify the affected
customers that water is safe for consumption. During planned maintenance or repair situations,
when water pressure is expected to fall below twenty (20) psi, the water supplier must provide public
notice to the affected customers prior to planned maintenance or repair activity and shall ensure that the water is safe for consumption.
Cross Connection Control Diamond Bar Estates initiated a Cross Connection Control Program in June of 2004. The program includes inspections of services to evaluate potential cross connections, installation of adequate and suitable backflow protection, annual testing of backflow assemblies by a licensed backflow assembly
tester and discontinuance of service where adequate backflow protection is not available. An active program will continue to be implemented by Gem State this year. Annual backflow assembly test reminders will be mailed to customers by April 1, 2020. Backflow testing reports must be submitted to Gem State by July 1, 2020.
Water Quality Monitoring Overview The system is in compliance with all current monitoring requirements. The monitoring schedule may be assessed at: http://www.deq.idaho.gov/water-quality/drinking-water/pws-switchboard.aspx.
Source Well water quality monitoring is below maximum contaminant levels (MCL). The nitrate level from
annual sampling collected in September 2019 was 1.24 mg/L; the maximum contaminant level for
nitrate is 10.0 mg/L. The arsenic level from a sample collected in September 2019 was 0.0019 mg/L; the maximum contaminant level for arsenic is 0.010 mg/L. Distribution System
Lead and copper samples collected from five residential locations in September 2019 indicated lead levels ranging from below minimum detection limits to 0.0024 mg/L, and copper ranging from 0.0224 mg/L to 0.0482 mg/L. The action level for lead in drinking water is 0.015 mg/L; the action level for copper is 1.3 mg/L.

The system is required to collect one coliform sample per month from rotating locations throughout distribution. A review of coliform sampling results over the last year indicates coliform samples are collected from the following distribution locations on a rotating basis: 1990 W Boekel, 14052 Rodeo, and 1798 W Boekel. Please provide an updated total coliform sampling plan within 30 days
of receipt of this report.

Administrative and Operational Oversight
Gem State Water Company, LLC provides administrative oversight of the system and is registered with Idaho Secretary of State. The Gem State Diamond Bar water system is classified as a Very Small Water System under direct oversight of responsible charge licensed operator, Leslie Abrams-Rayner. Ms. Abrams-Rayner holds Treatment 1 (DWT1-115876) and Distribution 1 (DWD1-14223) licenses; renewal is required by September 23, 2020.
Rate Structure The water system charges a metered rate of $29.00 per month for up to 55,000 gallons. Additional usage is billed at a rate of $0.80 per 1,000 gallons.
Conclusion The system will be considered to be operating in full compliance with the Idaho Rules for Public Drinking Water Systems at the time the following deficiencies and requirements are met.
Deficiencies – please provide a timeline for correction of deficiencies within 30 days of receipt of the survey report. 1. Significant pipe corrosion was apparent in the pump building, and some isolation valves were inoperable. In order to address, the operator plans to install a dehumidifying system, and
remove corrosion and ensure valve actuation. 2. Small holes in the tank hatch are required to be sealed. 3. As the system will be undergoing major material modification, the tank must be equipped with a designated vent and tank overflow must be equipped with a weighted flapper to prevent dust from entering the tank.
4. As the system will be undergoing material modification, the retro-fit well 1 discharge to waste must be routed to discharge away from the tank. 5. The bladder in tank number four was found to have failed. The tank has been valved off from the system and scheduled for replacement by March 31, 2020.
Requirements – please provide a timeline for completion of requirements within 30 days of receipt of the survey report. 1. The system is required to continue to operate with a back-up source following termination of
the current lease agreement to utilize well 2.
2. Well 2 discharge routes to distribution main on Atlas Road, an isolation valve on well discharge is located on the Turnipseed property. The valve was located during the survey and discussion between operators indicated a valve access easement would be created as required to ensure access to all water system distribution components.
3. A copy of the updated routine total coliform sample plan is to be provided to DEQ.
4. The dead end main on CJ Lane must continue to be flushed at a minimum frequency of twice per year. 5. The system is required to continue to implement their Cross Connection Control Program. 6. In the event of system depressurization, Rule requirements detailed on page 5 of this report
must be implemented by the purveyor.

Recommendations – the following recommendations are suggested to optimize system operation into the future.
1. It is strongly recommended that a flow meter and pressure transducer are installed on boosted discharge and communicate with planned PLC and SCADA components to allow for remote oversight. 2. The control valve on boosted discharge should be regularly maintained by a third party
contractor to ensure functionality. 3. All valves should be exercised on a routine basis. 4. Distribution main should be flushed on a routine basis.