2019_ISOLUX_ArsenicTreatment-PWS_Updated.pdf

Performance Work Statement

GRAPEVINE ARSENIC TREATMENT SYSTEM REPLACEMENT

Tonto National Forest

Tonto Basin Ranger District

SECTION 1 – GENERAL

1.1 SCOPE OF WORK

The scope of work shall include furnishing and installing a complete skid mounted, pre-piped, pre-engineered arsenic treatment system to the existing Grapevine Water System including obtaining the required ADEQ Approval to Construct permit and fee payment.

1.2 LOCATION DESCRIPTION

The project is located on the Tonto National Forest, Tonto Basin Ranger District, near

Roosevelt Lake, Gila County, Arizona. From Phoenix, travel north on SR 87 for about 75 miles, then east on SR 188 for about 20 miles. The project site is located at the Grapevine

Water System Control building.

1.4 – EXISTING SYSTEM BACKGROUND:

The Grapevine Water System consists of two wells connected together. Peak water demands are 71 gpm and 103,000 gpd. Combined well flow is 44 gpm. The total system storage capacity is 110,000 gallons. The system serves an administrative site, which includes a visitor center/office and work center, four campgrounds, and one day use area.

Influent water has arsenic levels ranging from 40 – 50 ppb and an average pH of 9.06.

Grapevine Water System is housed in a 12’ x 20’ metal control building. Incoming water is piped into the control building through a 3” PVC waterline which reduces down to a 2” line and into a 2” water meter. The line then goes into a hydropneumatic pressure tank and is injected with chlorine for disinfection. The treated water leaves the control building to the distribution system which serves four campgrounds, one day-use site, and an administrative site.

The existing arsenic treatment system was installed in 2006. The treatment system is an

ADEdge, Sorb 33, adsorption-type treatment system, Model #APU-40LL-S-2-B. The adsorbtion system consists of two vessels connected in series. The unit was delivered to the site on metal skids. Footprint of the system is 93” long x 55” wide x 105” high. The unit’s vessels hold 43 cuft of adsorption media. The system also includes pretreatment system comprising of a pH reduction module, HCL chemical feed module, and poly tank.

The major issues with the existing system are that it is old, expensive and time consuming to operate and maintain. The iron-based media lasts only about two years and needs to be replaced at a cost to the government of around $22,000. The media needs to be vacumed out, tested, and disposed of, then the media needs to be replaced in the vessals. It requires an ADEdge technician and two FS emplyees about two full days of work. Also, another major issue is the required pH adjustment. Due to the high pH levels, hydrochloric acid needs to be injected prior to arsenic treatment which becomes a health and safety issue with personnel. The acid has also damaged the metal building walls and vents.

SECTION II - STATEMENT OF WORK:

2.1 – REMOVAL OF EXISTING SYSTEM

Removal and disposal of the existing Bayoxide® E33S treatment system shall be completed by the Forest Service prior to the installation of the new system. The

Forest Service will coordinate closely with the Contractor so as to minimally disprupt service.

2.2 – ARSENIC TREATMENT SYSTEM REPLACEMENT

The new arsenic treatment system shall meet or exceed all the requirements of the

ISOLUX® Arsenic Removal System using cartridge technology, Model # ISO-50-SS, 50 gpm, mounted on stainless steel skids with two cartridge vessel and shall include a

ProMinent® CO2 Feeder and components. The treatment system shall include the following salient characteristics listed below. If the proposal doesn’t meet any of the salient characteristics specified below, the proposal must include those salient characteristics that are not being satisfied.

CO2 pH Adjustment System, ProMinent® CO2 Feeder, including the following components:

o 3 HP Booster Pump, 50 gpm @ 62 psi, 110 or 230 volt, 60 cycle o CO2 – 50 Feed Unit, 2-50 SCFH o CO2 – 50D Feed Unit, 2-50 SCFH with Diffuser o Cylinder Automatic CO2 Switchover System

Prefilter - Isolux® 1-micron Prefilter o Prefilter housing - 1-micron bag type, side entry, stainless steel, single bag.

Treatment Media - ISOLUX® Zirconium Hydroxide Adsorption Media o Non-leachable arsenic bond o Powder form adsorption medai, not granular media o Removes Arsenic III and V Simultaneously o No backwashing or wasting required o NSF 61 certified for drinking water use o 99% to non-detect arsenic removal o Non-toxic & passes the USEPA TLCP test as a non-hazardous waste safe for disposal in landfills.

o Media cartridges – easy-to-load and are sealed.

Engineered Modular Filter Housing Skids o Maximum Operating Pressure of 150 psig at 200°F o 304 Stainless Steel Construction – Head, shell, internal components o Inlet/Outlet Connection – 2 “ ANSI Flange o Shell O-rings: EPDM o Certified by ISO 9001 quality system o Designed to hold ISOLUX® filter cartridges with NSF61 certified

Zirconium adsorption media.

o Number of media cartridges – 10 o Cartridge lift handle

Other Required Components o Pressure gauges o Air relief valve o Totalizing flow meter o Drain port for sampling o 2” Check valve

The new system and all other components shall be installed according to the manufacturer’s specifications along with current plumbing and electrical codes and

Arizona Department of Environmental Quality (ADEQ) regulations. The Contractor shall be responsible for the completion and submittal to ADEQ the required

Application for Appoval to Construct as well as the necessary technical review fees.

The FS will provide to the Contractor any Grapevine water system information necessary for the application.

After the system installation, the Contractor shall provide testing to insure the unit is functioning properly and then flush and chlorinate the system to ensure safe drinking water.

Once the system is complete, the Contractor shall provided on-site training to FS personnel on the system operations and maintenance.

See Attachments 1 through 4 for the arsenic treatment system schematic including component catalog cuts.

2.3 – SUBMITTALS:

Contractor shall submit prior to purchase and installation the following submittals for approval (with exception of O & M Manual):

Shop drawings and layout schematics of the arsenic treatment system, including pretreatment prior.

Catalog cuts/product literature of all system components.

Final system equipment list.

Operating and Maintenance Manual, in binder form, which includes all literature and operating instructions on the system components.

2.4 – PERFORMANCE PERIOD:

Work shall be completed within 90 days after issuance of the contract award.

PHOTOS OF EXISTING ADEDGE ARSENIC TREATMENT SYSTEM

Media vessels, controller and piping to be removed and disposed by the

Forest Service prior to installation of the new system.

Piping and HCL injection pump located in the back of the vessels to be removed and disposed by the

Forest Service.

Grapevine Water

System chorine injection and hydro pneumatic tanks (for reference).