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8.30 <br /> <br />Subd. 4. I)is~ution of efIluen~ <br /> <br />Gravity u iom <br /> <br />1. Level Grou~cL V~here the elevation differences o~ ~e ~o~d <br /> s~a~ does no~ e~ceefl 28 ~es ~ ~y ~rec~on ~t~n ~e <br /> soft t~a~ent ~ea, ~e sewage ~n~ may be ~rec~d to the <br /> soil treatment area through a system of' ~nterconnected <br /> ~st~bu~on p~pes or t~n~ed ~ a con~nuous sys~m. <br /> <br /> S~gh~y Slop~g G~~ ~ere ~e e]eva~on ~erence of <br /> the ~o~d s~ace exceeds 28 ~nches ~n ~y ~rect{on ~t~n <br /> the soil treatment area, ~e sewage ~nk e~uent ~ay be <br /> ~stHbuted by a ~st~bu~on box, prodded the ~n~ ~o~d <br /> s~ace eleva~on of ~e lo.est tren~ is at least 1 foot h~gher <br /> ~ ~e ou~et ~ve~s of ~e ~s~budon box. <br /> (al ~e box sh~] be ~ate~lght ~ a removaiIe cover and <br /> sh~l be const~c~d of d~able mater.s not subject to <br /> excessive co~os~on or .decay. Ea~ out]et shall have at <br /> least 6 ~ches of s~de~dJ) space ~d'the side of ~y outlet <br /> sh~ be at least 6 ~es ~om ~y co.er. <br /> ~) ~s ~ve~s of ~]] outle~ sh~ be at ~e s~e elevation. <br /> (o) The in]et ~ve~ sh~l be at least 1 ~ above the outlet <br /> ~nve~s. <br /> (d) ~e ou~et [nve~s sh~l be at least 4 inches above the <br /> ~s~bu~on box ~oor. <br /> (el Each dra~eld trench line shall be connected <br /> separately to the ~st~bution box ~d shall not be <br /> subsided. <br /> (Q ~hen sewage tan~ effluent ~s delivered to the <br /> ~s~but~on box by p~p, ei~sr.a.ba~e wall sh~I be <br /> ~nst~]]ed ~ ~e ~stHbu~on box or the pu~p discharge <br /> sha]] be d~ected a~nst'a w~'br'sfde of t~e bor on <br /> ~ch there ~s no outlet. The ba~e shM1 be secured to <br /> the box ~nd sh~] ex.nd at least 1 ~ch above the crown <br /> of the ~et ~o~ line. <br /> <br />Sloping Ground. VChere the elevation difference of the <br />ground surface exceeds 28 inches in any direction v~ithin soil <br />treatment area and a distribution box c~not be used as <br />specified in subdivision 1 above, a drop box shall ha installed <br />at the head end of each lateral line. Connection between drop <br />boxes 'shall be by watertight pipes. <br />(a) The drop box shall be watertight' and constructed of <br /> durable materials not subject to excessive corrosion or <br /> decay. Each outlet shall have at least 6 inches of <br /> sidewall space and the side of any out]et shall be at least <br /> 4 inches from an3' corner. <br /> <br />'~ O~S Printed 12/28/90 <br /> <br /> <br />