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I <br /> <br />I <br /> I <br /> I <br /> <br />I <br />I <br />I <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />I <br /> <br />cover to a point within twelve (12) inches, but no closer than six (6) <br />inches, below finished grade. The manhole cover shall be covered with <br />at least six (6) inches of earth. The top of the seepage pit shall be <br />not less than twelve (12) inches below the ground surface. The top <br />shall be provided with an inspection pipe of not less than four (4) <br />inch diameter extending to a point flush with finished ground level. <br />The top of the inspection pipe shall be provided with a readily remov- <br />able watertight cap. <br /> <br />Subd. 4 HOLDING TANKS <br /> <br />GENERAL <br /> <br />Holding tanks may be allowed only as replacements for existing non- <br />conforming urban service area systems and only where it can conclusive- <br />ly be shown that a standard or approved alternative system cannot be <br />feasibly installed, or where holding tanks can be demonstrated to be <br />more economical than alternative systems. <br /> <br />CONMF RUCr I C~q <br /> <br />A holding tank shall be constructed of the same materials and by the <br />same procedures as those specified for watertight septic tanks, except <br />that there be no outlet pipe. <br /> <br />ACCESS <br /> <br />A cleanout pipe of at least six (6) inches diameter shall extend to the <br />ground surface and be provided with seals to prevent odor and to exclude <br />insects and vermin. A manhole of at least twenty (20) inches in dimen- <br />sion shall extend to a point within twelve (12) inches, but no closer <br />than six (6) inches, below finished grade. The manhole cover shall be <br />covered with at least six (6) inches of earth. <br /> <br />DEPTH OF BURY <br /> <br />The tank shall be protected against flotation under highwater table <br />conditions. <br /> <br />C.A~ACITY <br /> <br />For a dwelling, the size shall be two thousand (2,000) gallons or four <br />hundred (400) gallons times the number of bedrooms, whichever is great- <br />est. For permanent structures other than dwellings, the capacity shall <br />be based on measured flow rates or estimated flow rates. The tank capa- <br />city shall be at least five (5) times the daily flow rate. <br /> <br />ttolding tanks shall be located: <br /> <br />a. In an asea readily a:cessible to the pump truck <br /> under all weather conditions; <br />t~. /ks s~ecifled for sep:ic tanks; <br />,. k~er~ a'.cidental spillage during pumping will not <br /> create , nuisance. <br /> <br /> <br />