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f / e <br /> a <br /> MOUND DESIGN WORKSHEET <br /> (For Flows up to 1200 d) <br /> �. FLOW EpUluttcd se+�e F1°..e la calleln Va dq <br /> too <br /> Estimated 75-0 gpd r�rll �"�p �` <br /> or measured x 1.5 = gpd. 2 300 225 lap <br /> 3640300 300 216 eon <br /> 37S 256 .ran <br /> in <br /> B. SEPTIC TANK LIQUID VOLUMES 6don <br /> 9 b o r Tia <br /> Two- Soo gallons a 1700 6673 401 m <br /> w:iM, owa. Ieoo YaAI e•-% dos` �o•hh 'dun° <br /> C. SOILS(refer to site evaluation) SeNk Tank r-s des On <br /> 1. Depth to restricting layer= f S inches feet Nmrkaot M�u,.°„6ge1a 6tynta�o�ln.�In � <br /> 2. Depth of percolation tests = 2 inches ' rdk <br /> 3. TextureS��!k laom ckj�MPercolation rate 5710 mpi 23or i o �'3 0 2M <br /> 4. Land slope 3- (o % ,'s 9 2M 30 0 4 <br /> D. ROCK LAYER DIMENSIONS Mound LLR <br /> 1. Multiply flow rate by 0.83 to obtain required area of rock layer: A x 0.83 = Perc Rate LLR <br /> '75o gpd x 0.83 sq. ft./gpd = Cp3d sq. ft. <120 MPI :512 <br /> 2. Determine width of rock layer =0.83 sq. ft./gpd x Linear.Loading Rate (LLR) >120 MPI < 6 <br /> 0.83 sq. ft/gpd x I z- _ 10 ft _ <br /> 3. Length of rock layer=area-1-width= <br /> 4 e+r. r: . ��. r• v.trtir <br /> S-31) sq. ft.+ co ft. e �c,:t~7:9< , b <br /> A <br /> i:pbpNQ6'wtrr.:r*. <br /> Width -I* ft 6 <br /> <120mpi <10' Length 63 ft <br /> E. ROCK VOLUME >120mpi <5' <br /> 1. Multiply rock area by rock depth to get cubic feet of rock;e3 o sq. ft.x I-os ft._ <br /> (o eo.4 cu. ft. <br /> 2. Divide cu.ft.by 27 cu.ft./cu. yd. to get cubic yards; <br /> (,,eo.g0 cu. ft. +27 cu. yd. <br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons; 2s.i cu.yd. x•1.4 ton/ 35.3 '10 4-e. <br /> F. ABSORPTION WIDTH <br /> 1. Percolation rate in tole 12 inches of soil is S o mpi Absorption Width Sla''"76le <br /> Texture sr Loaw, - u�r GIS raFtfsa1r .. oa�rw► AWN •-1�. <br /> QoM OPIUM <br /> Rotadm0.1 CerwSna 610 600 <br /> 2. Select allowable soil loading rate from table; 0•'a3 �� 10 600 <br /> °.ins 19a. is aa° 7.00 <br /> d �'S gpd/ft2 dais amu.. ON 1.1 <br /> 16 to" � in <br /> • SIM <br /> 3. Calculate absorption width ratio by dividing rock layer "16D Q, °" '" <br /> loading rate of 1.20 gpd/fF by allowable boil loading rate; I 91�• <br /> 1.20 gpd/ft2 + o•'9r gpd/fe = Z.1-- <br /> 4. Multiply absorption width ratio by rock layer width to get <br /> required absorption width; <br /> 1 0 x z.6-7 ft= z-7 ft. <br />