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§ 8.30 <br /> <br /> b) In every case, sufMc~ent area shall be provided for at <br /> least two bedrooms ~u dwellings. <br /> c) For systems other than household systems, the required <br /> treatment area sh~]] be based upon gallons of waste per <br /> day. The required treatment area may be reduced, for <br /> trenches on]y, by the following percentages: 20% for 12 <br /> inches of filter materials bdlow the '~str~bution pipe', <br /> 34% for 15 £uches; and 409'0 for 24 inches. The filter <br /> material shall completely encase the disposal pipes to h <br /> depth of at least 2 inches. <br /> d) Soft is unsuitable for standard system if percolation rate <br /> is less than 0.1 minute per ~uah. <br /> e) Special requirem'mts for treatment un, ts for problem <br /> soils v~th this percolation range. ]For softs having more <br /> than 50% of very fine sand by weight, plus fnma sand <br /> having a particle size range of 0.05 m~qlimeters (sieve <br /> size 270) to 0.25 r~]l~meters (sieve size 60), the required <br /> so~l treatment area is 1.67 square feet per gallon of <br /> sewage ~ow. per day. <br /> Locado~ <br /> <br />1. On slopes ~u excess of 12%, the soil profile shah be carefully <br /> evaluated ~u the location of the proposed so~t treatment area <br /> and downslope to 'identify the presence of layers with <br /> di~erent permeabil~ties that may cause sideh/II seepage. In <br /> no case shall a trench be located v~thin 15 feet of where such <br /> a layer surfaces on the downslope. <br /> <br />2. Bed construction shall be limited .to areas having natural <br /> slopes of less than 6%. <br /> <br />3. Any soil treatment ar. ua shall be set back the follov~dng <br /> distances from the features adven below. <br /> <br />Pe~_~e Seth~c_ _k <br /> IM~mnce <br /> in F~ <br />Water supply we~ less ~ SO feet ~eep ~d not 100' <br />enco~ng at least 10 feet ofimpe~ous <br />mate~al <br />~y o~er water supply well or b~ed wate~ ' '~ <br />suction pipe <br />Bm~ed pipe ~t~uting water ~dar.pre~s~e 10 <br />Buit~ng .... ~ <br />Pr0pe~y l~es 10 <br /> <br />*Required for new developments and, where applicable, for <br />existing developments. <br /> <br />Page 250 Printed 12,'28/90 <br /> <br /> <br />