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CITY OF ORONO <br />GENERAL CONSTRUCTION REQUIREMENTS <br />STANDARD DRAINFIELD SYSTEM <br />TO BE USED WHERE: Seasonal perched water table is deeper than 5 feet. <br />Percolation rate is between 112 and 60 min. per inch. <br />Slope is 18% or less. <br />CONNECTION TO <br />HOUSE House to tanks may be PVC (ASTM D-3034 or better), <br />cast iron or clay tile. PVC should be sand -bedded <br />in flat runs over long distances. No outside air test <br />required but joints must be tight. <br />TANKS Two (2) precast ccncrete tanks are required. Min. size <br />1000 gal. and 750 gal.; we recommend 2 1000's. Tanks <br />must have 20" manhole riser to within 12" of final <br />grade, and at least one 4"-6" inspection stack to <br />surface. Baffles must be acid resistant and may be <br />plastic, fiberglass, or precast with tank. <br />DRAINFIELD Standard trenches in top 2-3' of natural undisturbed <br />soil. not in cut or fill areas. Max. width 36". <br />Max. length per line 1001. Rock 6-12" below pipe and <br />2" over top. Tile may be PVC or plastic with 112" <br />holes every 36" or closer. Use hay or untreated <br />building pa er over rock. Backfill - max. depth 36", <br />min. depth ", 12-24" preferred. Trench bottom must <br />be level or have slope of not more than 4" per 1001. <br />DISTRIBUTION Drop boxes or distribution box depending on layout <br />and topography. <br />WOW <br />Iloetihs <br />Solids <br />sludge <br />Distribution box Drainfield' <br />PING If pumping is needed between tank and drainfield, <br />pump should go in a 3rd tank or in baffled chamber <br />in 2nd tank. The idea is to retain the 2nd tanks <br />capacity for solids retention. An alarm device and <br />reserve capacity of one days sewage flow are required. <br />QUESTIONS ? CALL THE SEPTIC SYSTEM INSPECTOR AT 473-7357. <br />