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MOUND DESIGN WORKSHEET <br /> (For Flows up to 1200 gpd) <br /> Eaiauted Sews;.Flows In Gallons per d <br /> A. FLOW 1" k <br /> Estimated r%-- gpd Is I n mxm Tg <br /> x 1.5Bee`°o`fl` <br /> or measured - gpd. I50 <br /> 2 50 XO 215 de <br /> B. SEPTIC TANK LIQUID VOLUMES 4eCO 5 730 450375 iIli <br /> )- 1 <° l - 1 o o a gallons 6 0 525 332il <br /> v 1 $ i 1200 6n 401 m <br /> cons <br /> C. SOILS (refer to site evaluation) a.... ..+c. -« <br /> 1. Depth to restricting layer= J - inches_feet � 1Jq,, ,„„ °, <br /> D" inches CM S Vim,aT:� <br /> 2. Depth of percolation tests = �>C <br /> Percolation rate 4�Z mpi 231.'7 g°0 "° XC <br /> 3. Texture �-� �-� ` wx <br /> Ka <br /> 1�a of Y 7000 )� .00C <br /> 4. Land slope 5 <br /> D. ROCK LAYER DIMENSIONS <br /> 1. Multiply flow rate by 0.83 to obtain required area of rock layer. A x 0.83 = <br /> 7_<v gpd x 0.83 sq. ft./gpd = ) sq. ft. <br /> 2. Select width of rock layer (max 10' if <120 mpi max 5') = /D ft. <br /> 3. Length of rock layer = area +width = <br /> • i�,t•D_ sq. ft. + /Q ft. _ `�. ft. 7.P .{ .¢;Y :vl'Mib)l�xl�A�FR�/C�I7C4.R"M: <br /> 11!! F <br /> width ft •, c7,. . . . . <br /> <120mpi <10' Length-L.-a-ft <br /> >120mpi <5' <br /> E. ROCK VOLUME <br /> 1. Multiply rock area by rock depth to get cubic feet of rock; C-:':-, sq. ft. x ' <br /> ft. = L>S3 Cu. ft. <br /> 2. Divide cu. ft. by 27 cu. ft./cu. yd. to get cubic yards; <br /> cu. ft. +27 = , 1 cu. yd. <br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons; a`1 cu. yd. x 1.4 <br /> ton/cu. yd. = 7 -+ tons. <br /> F. ABSORPTION WIDTH Absorption Width Sib Table <br /> 1. Percolation rate in top 12 inches of soil is .2- mpi 14.01.6.p...16 l�, w <br /> Texture L\-A'-' Loayo c �"" pada ` u'�r W <br /> Fuer duo 0,1 Cam Sa 4 1.20 1,0 <br /> 0.1 so s Seed 1.20 1.0f <br /> 2. Select allowable soil loading rate from table; 0.1'e s Fla&"'d 0.60 z.2.0(6 so 15 Slaty Loam 0.79 1.5; <br /> 1 s gpd/ft2 31 so <br /> 0s Slit Loma 0.o iM <br /> 461o60 cli I.am 0.45 2.6 <br /> • <br /> 3. Calculate adsorption width ratio by dividing rock layer st°"l*th"I20 CQ'i Duo 6 0 <br /> loading rate of 1.20 gpd/ft2 by allowable soil loading rate; <br /> 1.20 gpd/ft2+ -Li sC gpd/ft2= . .t,9 <br /> 4. • Multiply adsorption width ratio by rock layer width to get <br /> required adsorption width; <br /> -,_.1.,- x ;-) ft =, , 1 ft <br />