Stony Fork Water System Descripton 2020.docx

Stony Fork Campground 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

Treatment Capacity

Storage Capacity

Total Effective Volume = 10,633 gallons