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MOUND DESIGN WORKSHEET <br /> (For Flows up to 1200 gpd) <br /> A. FLOW mea SmUe FI �a�M Per <br /> Estimated.�°gpd d. c a� TMI nn 11 <br /> TMm <br /> or measured x 1.5 ==gp <br /> 4 600 13 373 2 3W zts ISO 6C <br /> 22% y} <br /> or <br /> B. SEPTIC TANK LIQUID VOLUMES 3 730 430 294 13 <br /> _ ��0 41-J o 0gallons 0 ►^'► 6 90o Sts 370 <br /> m T <br /> a..SO i i i a6m <br /> 9x C <br /> C. SOILS (refer to site evaluation) <br /> 1. Depth to restricting layer=u iza inches=feet � �,,,, „p,d,1�„„ ,a <br /> ,. � inches 4.a.wr d� c■+w a.�..i un w <br /> 2. Depth of percolation tests=.�_ IM <br /> �,o A�. Percolation rate 1� mpi 'i~ �� <br /> 3. Texture .,� <br /> 4. Land slope <br /> D. ROCK LAYER.D1MfiN SIONS <br /> 1. Multiply flow rate by 0.83 to obtain required area of rock layer. A x 0.83 = <br /> goo gpd x 0.83 sq. ft./gpd = I LA-7 sq. aa V <br /> 2. Select width of rock layer (max 10' if<120 mpi max 5') = ft• <br /> 3. Length of rock layer= area+width <br /> =sq. ft. + 0 -- ft. _ ', ft. , • . <br /> WidthJ,oft • . <br /> <120mpi <10' Lengthft <br /> >120mpi <5' <br /> E. ROCK VOLUME <br /> 1. Multiply rock area by rock depth to get cubic feet of rock; Y za: sq. ft. x 5' <br /> ft. = .cu. ft. <br /> 2. Divide cu. ft.by 27 cu. ft./cu. yd. to get cubic yards; <br /> jib,cu. ft. +27=��,cu. yd. <br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons; 3A cu. yd. x 1.4 <br /> ton/cu.yd. _ _4,5' tons. <br /> 7F. SORPTION WIDTH A a7dom worts 8�Table <br /> ercolation rate in top 12 inches of soil is �. mpi NWA In sdlTae., Mexture L�Aq Lol4vvA W� '°"'" <br /> Pum due 0.1 Come Seed 120 1.c <br /> 0.1 a 4 Seed 120 1.0 <br /> .2. Select allowable soil loading rate from table; 6 1s Flee Seen 0.79 zc <br /> - 1,,�,� oTf t� 6 ro 14 Saedr Loam 0.79 I.: <br /> Li C Ord/it2 iia43 314%I"= o� 2. <br /> 0 0120 60 0 t _ 0.0.24 2. <br /> 5. <br /> 3. Calculate adsorption width ratio by dividing rock layer 10-l"120 Ca,," 020 6. <br /> loading rate of 1.20 gpd/ft2 by allowable soil loading rate; <br /> 1.20 gpd/ft2+ .14�' gpd/ft== a <br /> 4. Multiply adsorption width ratio by rock layer width to get <br /> required adsorption width; <br /> :),02x.10 -ft=a o ft <br />