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MOUND DESIGN WORKSHEET <br />(For Flows up to 1200 gpd) <br />A. FLOW <br />Estimated gpd (see pages D-7 or 1-3,4,5) <br />or measured ^ gpd x 15 =* —_______. <br />B. SEPTIC TANK LIQUID VOLUMES <br />% 1^/000 gallons (seepagesC-3oi C-5) <br />C. SOILS (refer to site evaluation) <br />1. Depth to restricting layer » <br />2. Depth of percolation tests = <br />3. Percolation rate <br />4. Land slope _ <br />IX <br />inches <br />. inches <br />1 <br />_mpi <br />% JV-. w C,ov\-TM <br />EaiMM4 FiDwa ia CaluM for <br />itHi <br />l»mm <br />ti <br />Rttnmmi <br />TV»«I lywii Tmm Tr <br />2 MO 22S no <br />J 300 211 4M <br />4 «00 373 230 OW <br />S 730 430 394 to«MO 323 332 riml <br />7 lOM 400 370 <br />umm•1300 •73 400 ■i <br />liatkTMik b laaNM <br />MuubmM Ln.tal J eafmHf vitft <br />C^iqr <br />m iia <br />l«4 MOB im4«4 WO tm <br />T.lar*aw««•— <br />D. ROCK LAYER DIMENSIONS <br />1. Multiply flow rate by 0.83 to obtain required area of rock <br />layer: Daily Flow x 0.83 » <br />gpdX0.83sq.ft./gpd« sq.ft.*^ <br />2. Select width of rock layer (10 feet or less) = /o ft. <br />3. Length of rock layer « Area Width « <br />sq.ft.» /Q ft a ft.Rock Bed <br />E. ROCK VOLUME <br />1. Multiply rock area by rock depth to get cubic feet of rock; <br />U/hL sq. ft. X ft. ■ 0)^ cu. ft. <br />2. Divide cu. ft. by 27 cu. ft./cu. yd. to get cubic yards; <br />^i</cu.ft. ♦ 27■ cu.yd. <br />3. Multiply cubic yards by 1.4 to get weight of rock in tons; <br />in cu. yd. X 1.4 ton/cu. yd. * 3^ tons. <br />duk siort <br />F. <br />1. <br />2. <br />3. <br />ADSORPTION WIDTH <br />Percolation rate in top 12 inches of soil is mpi <br />Select allowable soil loading rate from table on page E-; <br />.MvT gpd/ft* <br />Calculate adsorption width ratio by dividing rock layer <br />loading rate of 1.20 gpd/fp by allowable soil loading rate; <br />1.20gpd/ft»^oHilgpd/ft*- . <br />Check this value on page E-16. <br />Multiply adsorption width ratio by rock layer width to get <br />requir^ adsorption width; <br />AtwrflliB WIddi ShfcunWt <br />^ft