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MOUND DESIGN WORKSHEEf <br />(For Flows up to 1200 gpd) <br />A. FLAW <br />Estimated = D c gpd (seepages D-7 or 1-3,4, 5) <br />or measured — gpd x 1.5 = --- <br />B. SEPTIC TANK LIQUID VOLUMES <br />J gallons (see pages C-3 or C-5) <br />C. SOBS (refer to site evaluation) <br />1. Depth to restricting layer = inches <br />2. Depth of percolation tests = = inches <br />3. Percolation rate mpi -r t r <br />4. Land slope J % <br />D. ROCK LAYER :*:" :':VISIONS <br />I. Multiply flow rate by 0.83 to obtain required area of rock <br />layer•. Daily Flow x 0.83 = <br />gpd x 0.83 sq. ft./gpd = - <br />2. Select width of rock layer (10 feet or less) <br />3. Length of rock layer = Area + Width IN <br />sq. ft. + 1,7 ft. _ - - ft. <br />E. ROCK VOLUME <br />1. Multiply rock area by rock depth to get cubic feet of rock; <br />-i sq. ft. x , - us ft. _ 1�.L cu. ft. <br />2. Divide cu. ft. by 27 cu. ft./cu. yd. to get cubic yards; <br />s ,? u cu. ft. + 27 = —aL cu. yd. <br />3. Multiply cubic yards by 1.4 to get weight of rock in tons, <br />cu. yd. x 1.4 ton/cu. yd. = 3- tons. <br />F. ADSORPIZON WIDTH c� L <br />1. Percolation rate in top 12 inches of soil is ��z mpi <br />2. Select allowable soil loading rate from table on page E-; <br />1.L_ gpd/fe <br />3. Calculate adsorption width ratio by dividing rock layer <br />loading rate of 1.20 gpd/fP by allowable soil loading rate, <br />1.20 gpd/ft2+ .,-, gpd/ft2= a . � � <br />Check this mhu on page E-16. <br />4. Multiply adsorption width ratio by rock layer width to get <br />required adsorption width; <br />(11041 <br />d <br />a=. <br />7�p1 <br />1"m0 <br />�01 <br />ir 7.i.. <br />1 <br />430 <br />73OQ <br />218 <br />4 <br />7 <br />tM <br />Go30� <br />0 <br />1=1 <br />in 1 <br />40 <br />. <br />4*n+c8P§*%bpw <br />Now" <br />wrC�+r"'r' <br />'=a <br />OW-6 5.1 <br />7. M <br />TO <br />11= <br />:.4 <br />is <br />t <br />"Mom <br />7: <br />3" <br />.w. f <br />Rock Bed <br />SOIL <br />Amrpson vAm Eft7Wo <br />rwmwwmam <br />M IMalr <br />Mri p�IRI <br />si im w <br />Go = <br />Per <br />�Nw W <br />Nobel <br />wra.a� <br />cs...a.r <br />wars <br />sold <br />Is31045 <br />Gets <br />an <br />L" <br />won <br />am <br />2A <br />to <br />to <br />LawaAI <br />Mon <br />3a <br />