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MOUND DESIGN WORKSHEET <br />(For Flows up to 1200 gpd) <br />A. FL01I" <br />Estimated :r^r gpd (see pages D-7 or I-3, 4, 5) <br />or measured — gpd x 1.5 = --- <br />B. SEPTIC TANK LIQUID VOLUMES <br />gallons (see pages C-3 or C-5) <br />C. SOILS (refer to site evaluation) <br />1. Depth to restricting layer = = inches <br />2. Depth of percolation tests = ,' — inches <br />�. Percolation rate a ? . mpi <br />Land slope a % <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 />( c(o gpd x 0.83 sq. ft./gpd so. ft.-4 is 15L+I <br />2. Select width of rock layer (10 feet or less) _ / G ft. <br />3. Length of rock layer = Area + Width = <br />5 Lt , sq. ft. + ft. _ ft. <br />E. ROCK VOLUME <br />I. Multiply rock area by rock depth to get cubic feet of rock; <br />c� SC fl. x �� ft. = ,-^-i cu. ft. <br />2. Divide cu. ft. bt .>.7 cu. ft./cu. yd. to get cubic yards; <br />CU. ft. + 27 = ' I cu. yd. <br />F. <br />1 <br />2 <br />3. <br />3. Multiply cubic yards by 1.4 to get weight of rock in tons; <br />cu. yd. x 1.4 ton/cu. yd. = ;. tons. <br />ADSORPTION WIDTH - L /- _ + , <br />Percolation rate in top 12 inches of soil is mpi <br />Select allowable soil loading rate from table on page E-; <br />'- gpd/ft2 <br />Calculate adsorption width ratio by dividing rock layer <br />loading rate of 1.20 gpd/ft2 by allowable soil loading rate; <br />1.20gpd/ ft2+ , gpd/ft2= <br />Check this value on paSt, E-16. <br />Multiply adsorption width ratio by rock layer width to get <br />required adsorption width; <br />x _ft=- ft <br />Estimated Sewage Flows in Gallons pta dry <br />(gpd) <br />Nurribc <br />Of <br />Type 1 <br />Type tl <br />Type III <br />Typc <br />Iledroorns <br />I y. <br />2 <br />300 <br />225 <br />180 <br />3 <br />450 <br />300 <br />219 <br />W% <br />4 <br />5 <br />600 <br />750 <br />375 <br />450 <br />256 <br />294 <br />d'kr <br />-W.. <br />6 <br />900 <br />525 <br />332 <br />lr a1. <br />1lut <br />7 <br />1050 <br />600 <br />370 <br />R <br />1200 <br />675 <br />408 I <br />ono <br />Sgtk Tomb Cap of e, iw a•Ibw. <br />N-umbsat <br />Kn,rnw I.,qud <br />I.,gttdc•p."yriN <br />tldn>om/ <br />Capacdy <br />swbW dup- <br />2 a k•• <br />750 <br />1125 <br />3w4 <br />109) <br />Ism <br />4 a 6 <br />IS110 <br />2230 <br />7, 9 at 9 <br />20[al <br />71Rat <br />a•ar 9 <br />...... <br />Rock Bed <br />r�•irrrrrrrrrrrr <br />\•\ \ \•\•\•\•\ \•\ \ ti•�•%.% <br />\,\•\•�s i•r•r•r•r•r.r.r•r.r•r <br />•r•r•r•r�r~r�r�r•r•r.•r•:tir~ftir 1 <br />Length --� <br />Absorption Width Sizing Table <br />Paro►s0on hate <br />m MtnWes ptr <br />Inch IMP I) <br />Soil Testurt <br />Gallons <br />per day per <br />sy-arc fuM <br />Ratio of <br />Atw m moon width <br />k, Rock L.yrr <br />Wrhh <br />PaVtt than 0 1 • <br />Course Sad <br />- <br />... . <br />0.1 10 5 <br />Ssrtd <br />1 20 <br />1 Oil <br />0 1 10 5 •• <br />Fine Sand •• <br />0 60 <br />2 W <br />6 10 15 <br />Sandy Learn <br />0.79 <br />1.52 <br />16 b 10 <br />Loarn <br />060 <br />2 IN) <br />31 to 43 <br />Silt Lam0 <br />2X1 <br />46 to 60 <br />Clay Loan <br />: D 45 <br />2 67 <br />60 to 121) <br />Clay <br />024 <br />5 tt0 <br />Slower than <br />Clay <br />..... <br />120••• <br />