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SOIL COVER soil cover may consist of on-site silty clay surface soil (USCS =cl,ml)material. If landscaping rThe f the mound is desired, drought tolerant grass may be planted on the mound. Instant sod lawn rass will help prevent erosion of the soil cap. As referenced, the slopes must not exceed 3:1, which will place the height of the mound at approximately three feet higher than surrounding grade. The grass should only be irrigated during the spring and summer months by an "impact" type sprinkler that is timed to come on 3-5 times per day for short durations, taking into account prevailing winds. It is imperative that irrigation water does not percolate past the root zone of the grass to prevent hydraulic loading of the mound. This may require careful management and investigation by a landscape contractor. D. MOUND SYSTEM OPERATIO OMPONENTS CONFIGURATION �.mnusdSis=chargethe SISTRIBUTION NETWORK The distribution of pipi effluent uifomily-9v a gravel bed, with three-foot spaced orifices so that effluent application area is -47 %onfce. Force main(transport line)piping will be to center-feed manifold is c manifold by"cro n"and not"tee-to-tee." There will be a total nc laterals ree on each sid of the manif d,2.5 feet apa Orifices shall be pre-drilled with a sharp do e a is n¢uQ orifice shie] th@ di 1 en s of the six laterals will extend upward towards the ends of the mound with c of valves at th `turn-up" d with access boxes,as shown on the Plans. Z �y LATERAL LENGTH AND DIAMETER Piping to consist of PVC Schedule 40. As determined above, lateral length shall beC 1.5 ft ach lateral, including the I inch clean-out sweep assembly. The diameter shall be 1 inch I.D. PERFORATION SIZE, SPACING AND NUMBER PER LATERAL Perforations I e 5/32 in. dia. For effluent distribution applications to be -4 ft/orifice,the spacing of perforations 3 fee (area per orifice x no. of laterals on each side of center feed----(absorption area width) =4 ft'x 3 - ft= ft. The number of tions per lateral shall be: \` N=(p=x)+0. _(31.5 ft= 3 ft)+0.5 =21 p rforations per lateral x 61 tera = 126 total perforations LATERAL DISCHARGE RA, (LDR) Recommended distal ess s 5 ,translate t 0.68 per orifice. LDR=0.68 gpm/perforation x I 1 perforations/lateral '=7.5 gp I MANIFOLD AND FO E MAIN DIAMETER The force main and manifold shall be 2.0 in.I.D.,composed of PVC Schedule 40. NETWORK DISCHARGE RATE R) NDR=6 laterals x 7.5 gpm/later 1 -45 gpm. 18 Chesney Consulting