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• <br /> 46 r.„,,,, , /00.0y.4 - ,,,,,,,74/& <br /> Figure E-17: Pump Tank piggyback plug inweatherproof closure <br /> Specifications ---------) or in House basement <br /> po'e( '�pp'> alarm wire <br /> union or other quick- <br /> disconnect fitting <br /> - 'II final grade <br /> alarm float on separate <br /> electrical circuit 1 <br /> c, w 'JA�I • <br /> 019 \ , <br /> zas <br /> 1__— <br /> stars ievci <br /> (0 03 II /39'94 I <br /> block to elevate <br /> shut-off level pump from <br /> tank bottom II <br /> pump control float• ,oma:: <br /> � k 9 <br /> L <br /> reaches twice tk. dose amount (the emergency' level). Proper <br /> dosing tank construction, placement and sizing must be <br /> 4� <br /> considered to ensure reliable system operation. <br /> The dosing tank construction requirements are the same as for <br /> • <br /> sewage tanks. The tank must be durable and watertight and must <br /> withstand the soil loads, which tend to push in on the walls. The <br /> environment in the tanks is eery corrosive, so no metal parts or <br /> fittings should bk. used. The major difference between a septic <br /> tank and a dosing tank is that the dosing tank wil[ be emptied on <br /> a daily basis. Since the tank will be emptied every day, anchoring <br /> it against flotation is critical in areas with a high seasonal or <br /> permanent water table, where mound systems, which require <br /> pressure distribution. ,-ire often used (see Figure E-16). <br /> • <br /> - Ensuring that the closing tank is watertight is also critical. In <br /> areas with a high seasonal or permanent water table, <br /> groundwater mai leak into the dosing tank and overload the <br /> system. The seals around the pipes that enter and exit the dosing <br /> tank are especially vulnerable to leaks. if the pump is running <br /> more than the few minutes a day it takes to pump out the <br /> accumulated septic tank effluent, groundwater may be leaking <br /> into the septic tank or dosing tank. <br />