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MOUND DEPTHS Aggfegate Absorption-Area thickness=-9 in:- (6 nr(6 in.of aggregate below the laterals, 1 in.for pipe height and 2 in,for cover over pipe=9 inches) Thickness of Topsoil(Fill and Cap)at the north and south edges of Aggregate Absorption Area = 12 in. Thickness of Topsoil (Fill and Cap)at the center of the Aggregate Absorption Area= 18 in. NORTH DOWN-SLOPE WIDTHI ( ) Mound side slope=of 3:1-,o. Height of mound=(18 in.Fill+9 in. Aggregate Absorption Area + -15 in. Avg. Topsoil thickness) Height:=.=3.5,ft. vertical x 3.horizontal= 10.5 ft:-Use 10 ft as referenced above. SOUTH UP-SLOPE WIDTH (J) Mourid-sicde slope of 3:1`. Height of mound=(18 in.Fill+9 in. Aggregate Absorption Area + -15 in. Avg.Topsoil thickness) Height=3.5 ft. vertical x 3 horizontal= 10.5 ft. Use 10 ft as referenced above. END-SLOPE LENGTHS AT EAST AND WEST ENDS(K) mound end slope of 3:1 K=3((18 in. + 18 in.)-2+9 in. + 18 in.) K= 11.3 ft. Use 11.0 ft OVERALL LENGTH AND WIDTH(L+W) L=B +2K L =63 ft+2(11 ft) W=A+I+J W = 10ft+ 10ft+ l0ft W"-30 ftp SOIL COVER The soil cover may consist of on-site peat surface soil (USCS = om) material. However, this material is extremely difficult to work with. Consequently,,it-is--our-strong-recommendation that a more-manageable-material-such as-a-sandy-silt-should be-imported-for the soil'cap;or cover. If landscaping of the mound is desired, drought tolerant grass may be planted on the mound. Instant sod lawn grass will help prevent erosion of the soil cap, but may retard evaporation/evapotranspiration. As referenced, the slopes must not exceed 3:1, which wil_ l-place the-height-of-the mound'at approximatel ,threee feet higher than surrounding ade. D. MOUND SYSTEM OPERATIONAL COMPONENTS CONFIGURATION OF PRESSURE DISTRIBUTION NETWORK The distribution of piping must discharge the effluent uniformly over the gravel bed, with three-foot spaced k orifices so that effluent application area is --4 W/orifice. Force main (transport line) piping will be to center-feed manifold. Laterals connect to the manifold by"cross construction" and not"tee-to-tee." There will be a total of six laterals -three on each side of the manifold, 2.5 feet apart. Orifices shall be pre- drilled with a sharp drill and installed facing up, with orifice shields. Clean-outs at the distal ends of the six laterals will extend upward towards the ends of the mound with control valves at the"turn-up" and with access boxes, as shown on the Plans. 16 Chesney Consulting