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MOUND DESIGN WORKSHLET <br />(For Flows up to 1200 gpd) <br />A. FLOCW <br />Estimated 9 U d _ gpd (see pages D-7 or I-3, 4, 5) <br />or measured - -- gpd x 1.5 = <br />B. SEPTIC TANK LIQUID VOLUMES <br />1-!0o o gallons (see pages C-3 or C-5) <br />C. SOILS (refer to site evaluation) 11 <br />1. Depth to restricting layer A a inches <br />2. Depth of percolation tests = 1 Inches <br />3. Percolation rate 1 •9 mpi <br />4. Land slope % <br />D. ROCK LAYER DIMENSIONS <br />1. Moltiply flow rate by 0.83 to obtain required area of rock <br />layer: Daily Flow x 0.83 = <br />9 o gpd x 0.83 sq. ft./gpd - 04 sq. ft. <br />2. Select width of rock layer (10 feet or less) _ 10 ft. <br />3. Length of rock layer = Area + Width = <br />X14'1 sq. ft. + o ft. _ ft. <br />E. ROCK VOLUME <br />1. Multiply rock area by rock depth to get cubic feet of rock; <br />'}4'1 sq. ft. x Lr . ft. = n_jja cu. ft. <br />2. Divide cu. ft. by 27 cu. ft./ cu. yd. to get cubic y• <br />lit cu. ft. + 27 = -P,�) cu. yd. <br />3. Multiply cubic Yards by 1.4 to get weight of rock. ..s; <br />. D -i cu. yd. x 1.4 ton/cu. yd. = ±� tons. <br />F. <br />1. <br />2. <br />3. <br />r.� <br />ADSORPTION WIDTH 1-\-4 L� Lo a rr <br />Percolation rate in top 12 inches of soil is mpi <br />Select allowable soil loading rate from table on page E-; <br />-;4 gpd /ft? <br />Calculate adsorption width ratio by dividing rock layer <br />loading rate of 1.20 gpd/ftp by allowable soil loading rate; <br />1.20gpd/ft2+ .tis-Lis <br />Check this value on page E-16. <br />Multiply adsorption width ratio by rock layer width to get <br />required adsorption width; <br />Ealbaa w sewase Fore N Oamms per by <br />(1Pd) <br />Nwnbm <br />F'~ 6Mn &I <br />carr Sard <br />0.1 b S <br />SaaO <br />o1 <br />Type I <br />Type II <br />Type 111 <br />6 to is <br />Re&.,Uraa <br />0.7v 1.32 <br />16 a 30 <br />110 <br />V <br />2 <br />1nD <br />223 <br />3 <br />e30 <br />300 <br />211 <br />lay <br />6 <br />600 <br />375 <br />tab <br />12D••• <br />3 <br />730 <br />450 <br />2% <br />.... <br />6 <br />110D <br />58 <br />332 <br />�w <br />7 <br />1 W <br />600 <br />370 <br />OrL <br />12W <br />613 <br />la <br />.M <br />SIP* T"b c-. Kb% Is Mir <br />"WAW of MMYnw LIQ../ l.ipY a pwYy �Y� <br />2 ar be <br />150 <br />Ills <br />3 a • <br />10M <br />19M <br />y�� `• <br />�- <br />--l- <br />.r« <br />_. <br />�� f�� t`yI`,f( �5����I+� 24• <br />ill�J I iIi Iijp2J � <br />Ab6wplIke WWIh SkIng Tsbk <br />Itioe+eMaeRoe <br />M MYwka ps <br />11rM (Mtl) <br />Soll'hawe <br />callan.Raels 0' <br />Iw dey per A4aor W w401h <br />prre NO to Roe! Uy" <br />w Mal111 <br />F'~ 6Mn &I <br />carr Sard <br />0.1 b S <br />SaaO <br />1.30 I A <br />0.Ib5•• <br />rMsand•• <br />0.602.1106 <br />6 to is <br />Surly Lnra <br />0.7v 1.32 <br />16 a 30 <br />Laa1r1 <br />0.60 2.110 <br />31 * 45 <br />SIN Lagar <br />0.70 1.40 <br />66 b 60"17Ua <br />0.15 1.67 <br />60 b 120 <br />lay <br />0.11 5.00 <br />sower t <br />clay <br />..... ..... <br />12D••• <br />