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MOUND DESIGN WORKSHEET <br />(For Flows up to 1200 gpd) <br />A. FLOW <br />Estimated 4 SD gpd (see pages D-7 or 1-3,4,5) <br />or measured gpd. <br />B. SEP71C TANK LIQUID VOLUMES <br />:1-/00() galloro (see pages C-3 or C-5) <br />C. SOILS (refirto slie evalustian) <br />I. Depth to restricting layer • 114-%'10" Inches <br />2. Depth of percolation tab 12, inches <br />3. Percolation rate _S 4 mpl <br />4. Land slope 4,.0 % <br />D. ROCK LAYER DIMENSIONS <br />1. Multiply flow rate by 0.63 to obtain required area of rock <br />layer. A x 0.83 - <br />HS'Q gpd x 0.83 sq. h. / gpd - 3 n sq• h. -r i o')o <br />2. Select width of rock layer (10 feet or less) - 1 D fl <br />3. Length of rock layer - arca + width - <br />�114 sq. ft. + j_ ft. - L41_ ft. <br />41D <br />I? ROCK VOLUME <br />1. Multiply rock area by rock depth to get cubic feet of rock; <br />410 sq. ft. x i .o S ft. • -�J& cu. ft <br />2. Divide cu. it. by 27 cu. ft /cu. yd. to get cubic yards; <br />= cu. ft + 27 - (, cu. yd. <br />3. Multiply cubic yards by 1.4 to get weight of rock in tons; <br />_13._ cu. yd. x 1.4 ton/cu. yd. - � D tons. <br />F. ADSORPMON WIDTH <br />1. Percolation rate in top 12 inches of soil is S• y mpi <br />2. Select allowable soil loading rate from table on page E-16; <br />_`Z gpd/ft2 <br />3. 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+ ,-iti gpd/ft2- i.s.) <br />Check this value on page E-16. <br />4. Multiply adsorption width ratio by rock layer width to get <br />required adsorption width; <br />-L-,SL x l0 ft- lg.;" ft <br />D-7 <br />Rock fled <br />L10 R <br />E-16 <br />C-3 <br />L <br />• <br />• <br />r r <br />• r <br />+ <br />r <br />• <br />• <br />•. w <br />�. + <br />r <br />.. <br />to <br />• <br />r r <br />r <br />` <br />• <br />it w <br />�• <br />Rock fled <br />L10 R <br />E-16 <br />C-3 <br />rmr. <br />Rock fled <br />L10 R <br />E-16 <br />