Water Operator 2021 Scope of Work.doc

C.1 Scope of Contract The individual performing the work must possess a current Class IV (or higher) Waterworks License.

Description of Work:

The intent of this contract is for contractor to perform water testing services and mixing of chemicals, as needed, for water treatment at the Stony Fork Campground & Beartree Campground well #3 (both are transient non-community public water systems) according to Virginia Department of Health Waterworks Regulations and Operating Permit. Contractor will be required to furnish all necessary transportation and labor.

Tests and record keeping must be in compliance with the “Virginia State Department of Health, Iron and Manganese/Softening Plant Report” (Exhibit 3). Vendor is responsible for signing/approving test results.

The past operations of these facilities have included the mixing of chemicals approximately two times per month.

The Forest Service will provide all chemicals and testing supplies with the exception of a pH Meter which will be responsibility of the contractor.

The Forest Service will retain the responsibility of conducting the monthly and quarterly water sampling outside of this contract.

Contractor Responsibility: Contractor to furnish its own insurance.

C.2 Estimated Start Date & Contract Time

Stony Fork Campground (Line Item 0001, 0002): May 1, 2021 through November 30, 2021.

Beartree Campground (Line Item 0003, 0004): May 1, 2021 through October 31, 2021.

C.3 Locations and Description of water treatment plants and systems Stony Fork Campground physical address: 109 Krenning Road, Wytheville, VA 24382.

Follow I-77 North from Wytheville, VA to Exit 47. Turn left onto SR 717 for approx. 4 miles. Campground will be on the left.

Water System Description

TYPE OF TREATMENT:

Chlorination, Sedimentation, and Greensand Plus Filtration (Iron and Manganese Removal)

SOURCE: Existing Well

DESIGN CAPACITY: 37,440 gallons per day (gpd) treatment capacity; 2183 gallons storage capacity

DESCRIPTION OF SYSTEM:

System consists of an iron and manganese removal treatment plant and a 2183 gallon atmospheric storage tank. The treatment system provides chlorination, the addition of soda ash for pH adjustment, sedimentation, and filtration through a green sand plus filter.

Two peristaltic-type metering pumps are provided for feeding sodium hypochlorite and soda ash to the well prior to the settling tank. Each metering pump has a capacity of between 2 and 40 gpd against 100 psi. These metering pumps take suction from existing solution tanks and operate simultaneously with the operation of the well pump.

A 2-inch diameter, 6-element, stainless steel, in-line static mixer is provided downstream of the soda ash and chlorine injection points.

The sedimentation tank is a hydro pneumatic tank with a volume of 1560 gallons. A separate 2-inch inlet and outlet is provided. Tank appurtenances include a sight glass, 2-inch drain, 11-inch by 15-inch access manhole, a pressure relief valve and an air release valve. This tank provides 60 minutes of detention time. The inlet/outlet end of the tank is located inside the treatment building while the rest of the tank extends out of the building.

The NSF-approved greensand plus filter has a 36-inch diameter with a 3.68gpd/ft² filtration rate based on the well pumping rate of 26gpm. The filter is located downstream of the settling tank. Filter appurtenances include discharge pressure gauge, a differential pressure switch, and a sample tap. The filter control system will automatically backwash the filter based on filter pressures or time clock using finished water from the distribution system. The filter backwash rate will be 105gpm or 14.85gpd/ft². There is an RPZ-type backflow preventer on the backwash water supply line. The control system is integrated with the well pump control system monitoring the water level in the atmospheric storage tank.

The filter effluent is delivered through a 2-inch diameter waterline to 3 existing storage tanks located on the hill above the treatment building.

Control of the well, chemical feed systems and filtration system is via an electrode that monitors the water level in the storage tanks.

The treatment plant is located in a framed building located adjacent to the existing well building. It is equipped with a concrete floor with 4-inch diameter floor drain, a ventilation system, a heater, light and a sink.

Piping is provided between the 3 storage tanks such that the water will enter the 6000 gallon tank before entering the 2450 gallon tank and finally entering the 2183 gallon tank. Additional piping allows any of the tanks to be taken out of service for maintenance.

The waterworks capacity is evaluated as follows:

Source Capacity

Well Capacity = 69 gpm (Purported Yield) x 1440 minutes/day = 99,360 gpd

Well Pump Capacity = 26 gpm x 1440 minutes/day = 37,440 gpd

Treatment Capacity

Hydraulic limit = (26 gpm) (1440 minutes/day) = 37,440 gpd

Based on well pump capacity of 26 gpm and filtration rate of 3.68 gpm/sq. ft.

Storage Capacity

Total Effective Volume = 10,633 gallons Beartree Campground well #3 physical address: 20993 Beartree Gap Road, Damascus, VA 24236.

From I-81 Southbound, take exit 29 at Glade Spring and turn left on Hwy 91 South at Damascus. At the intersection of Hwy 91 South and US 58 East, continue on US 58 East for approximately 8 miles. The campground is on the left. Once within the campground, take the first right down to the beach area. Well #3 is just behind the restroom facilities. From I-81 Northbound, take exit 19 at Abingdon and continue on US 58 East for 12 miles to Damascus. Continue on US 58 East for another 7 miles to the campground on the left.

Water System Description

TYPE OF TREATMENT:

Chlorination, Sedimentation, and Greensand Filtration (Iron and Manganese Removal)

SOURCE: Existing Well

DESIGN CAPACITY: 37,440 gallons per day (gpd) treatment capacity; 2183 gallons storage capacity System consists of an iron and manganese removal treatment plant and a 2183 gallon atmospheric storage tank. The treatment system provides chlorination, the addition of soda ash for pH adjustment, sedimentation, permanganate addition and filtration through a green sand filter.

The chlorination system is composed of a 50 gallon solution crock with graduations every 5 gallons and two metering pumps with a pumping range of 0.01 to 1 gallons per hour against 110 psi. The chlorine injection points are prior to the sedimentation tank and after filtration.

The soda ash feed system consists of a 50 gallon solution crock with graduations every 5 gallons and a tank-mounted ½ HP mixer. The pump capacity is the same as the chlorination metering pumps. The injection point for soda ash is prior to the sedimentation tank.

A 2-inch diameter in-line static mixer is provided downstream of the soda ash and chlorine injection points.

The sedimentation tank is a hydro pneumatic tank with a volume of 1560 gallons. A separate 2-inch inlet and outlet is provided. Tank appurtenances include a sight glass, 2-inch drain, 11-inch by 15-inch access manhole, a pressure relief valve and an air release valve. This tank provides 60 minutes of detention time. The inlet/outlet end of the tank is located inside the treatment building while the rest of the tank extends out of the building.

The potassium permanganate feed system is composed of a 50 gallon solution crock with graduations every 5 gallons and an electric mixer and a metering pump with the same capacity as the chlorination metering pumps. The permanganate injection point is prior to the filter.

The filtration system consists of one green sand filter. The filters have a filtering capacity of 26 gallons per minute (3.68 gpm/sq. ft.) and 36 inches in diameter. The filter media consists of 29 inches of green sand and 15.25 inches of anthracite. Sample taps are provided at the filter inlet, at a point ½ down the greensand bed, at the greensand/anthracite interface and after filtration. Filter appurtenances are included a loss of head gauge, access hatch, raw water meter, filtered water meter, backwash water meter and an air release valve.

The filter effluent is delivered through a 2-inch diameter waterline to 3 existing storage tanks located on the hill above the treatment building.

Backwashing of the filter is accomplished by gravity from the storage tanks and controlled by a rate-of-flow control valve. The maximum backwash rate is 99 gpm (14 gpm/sq. ft.). Backwash water is discharged to an existing sand drying bed followed by a drain field adjacent to the treatment plant. Control of the backwash cycle is via a time clock. There is a RPZ-type backflow preventer on the backwash water supply line.

Control of the well, chemical feed systems and filtration system is via an electrode that monitors the water level in the storage tanks.

The treatment plant is located in a framed building located adjacent to the existing well building. It is equipped with a concrete floor with 4-inch diameter floor drain, a ventilation system, a heater, light and a sink.

Piping is provided between the 3 storage tanks such that the water will enter the 6000 gallon tank before entering the 2450 gallon tank and finally entering the 2183 gallon tank. Additional piping allows any of the tanks to be taken out of service for maintenance.

The waterworks capacity is evaluated as follows:

Source Capacity

Well Capacity = 69 gpm (Purported Yield) x 1440 minutes/day = 99,360 gpd

Well Pump Capacity = 26 gpm x 1440 minutes/day = 37,440 gpd

Treatment Capacity

Hydraulic limit = (26 gpm) (1440 minutes/day) = 37,440 gpd

Based on well pump capacity of 26 gpm and filtration rate of 3.68 gpm/sq. ft.

Storage Capacity

Total Effective Volume = 10,633 gallons