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4. System Design Description page 2 24 inches in diameter. Cement risers above these lids(sealed at the top of the tank) provide access for pump servicing. A traffic rated reinforced concrete slab will be placed over the dosing tanks. The tanks are manufactured by P&L Concrete Products,Escalon, CA. A catalogue cut sheet for the 1900 gallon pre-cast septic tank is attached. These tanks will accumulate solids and will require periodic pumping. The frequency will depend on usage and will be inspected semi-annually. The tanks will be connected with a 6 inch pipe(ABS or PVC SDR35)to allow the tanks to act as one tank. Dosing Pumps and Controls One dosing pump, Grunfos Model#SE40 with the flow capability of 10 gallons per minute at 20 feet of head will be set in each dosing tank. The exact time per hour will be determined based on system flow. Control float switches will be utilized to stop the pumps at the low level, the high level override float will allow the pumps to continue to pump should the waste water flow increase to the dosing tank over a short period of time. The high level alarm float will provide a visual and audible alarm that the level in the �. dosing tank has exceeded the high level pump override setting. These floats will be attached to one discharge pipe from a dosing pump. The low level cut out float will actuate 24 inches above the bottom of the tank. The high level override float will actuate ,r at 50 inches from the bottom of the tank and the high level alarm float will be activate at 55 inches above the bottom of the tank. SJE Pump Master SPDT pump switches will be utilized. The floats will be attached to the discharge pipe in accordance with figure C on the attached catalogue cut sheet for the pump switches. The dosing pump head capacity diagram and specification sheet is also attached. The electrical diagram for the dosing pump circuit is attached. Piping All gravity piping will be 4 inch ABS piping or PVC SDR35 sewer pipe. All pressure and filter bed piping will be PVC Schedule 40 piping MicroSeptec Treatment Unit EnviroServer ES25 One MicroSeptec EnviroServer ES25 will be used. This unit is capable of processing up to 2500 gallons per day. The estimated daily flow of waste water is 1700 gallons per day. Refer to Figure 1 for location of components in EnviroServer. Wastewater influent is gravity fed into the first compartment(Primary Clarifier). In the first chamber, settling of +•• the sludge and solids occurs. The primary clarified wastewater overflows into the second compartment(First Aerated Compartment). In the second compartment the wastewater is aerated using a high-efficiency low-pressure air compressor and a membrane air diffuser assembly. The diffuser assembly is designed to ensure maximum oxygen transfer and optimum mixing of dissolved substrates and oxygen. Furthermore,the mixing ensures w