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MOUND DESIGN WORKSHEET <br />(For Flows up to 1200 gpd)I <br />A. FLOW <br />Estimated n ^ gpd (see pages D-7 or 1-3,4,5) <br />or measured______gpd.fa <br />B. SEPTIC TANK UQUID VOLUMES <br />A-/OSO gallons (see pages C-3 or C-5) <br />C SOILS (refer to site evaluation) <br />1. Depth toxestricting layer ■ i^'^o inches <br />2. Depth of percolation tests ■ > ^ ** inches <br />3. Percolation rate is.o mpi <br />4. Land slooe <br />!»■ 1 1 1 <br />BUMB <br />a m_a . <br />MB IBB BBB <br />MB fIB 0 <br />BBB ill m <br />MB •BB BM <br />MB V <br />IBBB 'BBB BM .ftIHBBIBBBB <br />wme TMR OMBcmi^ m wuan <br />=r ub Tslm <br />BBBIBM tSB <br />fSBS IBBB <br />••• IBBB BBBB <br />BBMB • mbb BBBB <br />D. ROCK LAYER DIMENSIONS <br />1. Multiply flow rate by 0.83 to obtain required area of rock <br />layer A x 0.83 « <br />^.5^) gpdX0.83sq.ft./gpd«sq.ft^ <br />2. Select width of rock layer (10 feet or less)« lo ft. <br />3. Length of rock layer « area ••• width <br />/..vM sq.ft.ft.» ft.Rock Bed <br />E. ROCK VOLUME <br />1. Multiply rock area by rock depth to get cubic feet of rock; <br />sq. ft. X Aoa ft« o/ ^cu. ft <br />Divide cu. ft by 27 cu. ft./cu. yd. to get cubic yards; <br />OWcu.ft. cu. yd. <br />Multiply cubic yards by 1.4 to get weight of rock in tons; <br />^0 cu. yd. X 1.4 ton/cu. yd.« 3o toiw. <br />Loigth <br />^th SlOft <br />2. <br />3. <br />F. ADSORPTION WIDTH <br />1. Percolation rate in top 12 inches of soil is mpi <br />2. Select allowable soil loading rate ftom table on page E-16; <br />gpd/ft2 <br />E-16 <br />3. Calculate adsorption width ratio by dividing rock layer <br />loading rate of 1.2o gpd/ft2 by allowable soil loading rate; <br />1.20gpd/ft2-*-_:OfLgpd/ft2* <br />Check this value on page E-16, <br />4. Multiply adsorption width ratio by rock layer width to get <br />requir^ adsorption width; <br />X /O ft« L<.^ ft 1.1lii!000 00m <br />e.i« • <br />• • IS <br />IS •m <br />SI b SS •s •## <br />SI <br />It ^ VRam %msjft ses 9.m <br />OM &9t 9jm <br />SM ftJS SlSS <br />vmISts <br />BBS <br />i