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'E-16 <br /> FFigure E-17: Pump Tank Piggyback plug in <br /> ecifications weatherproof closure <br /> or in house basement <br /> power supply alarm wire <br /> union or other quick- <br /> control wire disconnect fitting <br /> final grade <br /> t i..i4'i::i%t"2 iFr'.:?y• :,6r.•:• ..,.r;y•,ar.r• yL' 7' <br /> m� <br /> alarm float on separate <br /> electrical circuit <br /> V( Y <br /> /s-�krt Ievel <br /> ® .1/°"Q— " 7a block to elevate <br /> 7 shut-off level _ g pump from <br /> tank bottom <br /> pump control flo <br /> 313ono <br /> reaches*wice the dose amount (the emergency level). Proper <br /> dosing tank construction, placement and sizing must be <br /> considered to ensure reliable system operation. <br /> The dosing tank construction requirements are the same as for <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 very corrosive, so no metal parts or <br /> fittings should be used. The major difference between a septic <br /> tank and a dosing tank is that the dosing tank will 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, are often used (see Figure E-16). <br /> Ensuring that the dosing tank is watertight is also critical. In <br /> areas with a high seasonal or permanent water table, <br /> groundwater may 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 />