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A. Average Design FLU W A-1: Estimated Sewage Flows in Gcllons pe�Day <br /> num er o <br /> ' ' Estimated `7� gpd (see figure A-1) bedrooms c�ass� ctass�t c�ass��� C�ass�v <br /> or measured x 1.5 (safety factor) = gp 2 �0 225 1 eo � <br /> 3 450 300 218 ofthe <br /> 4 600 375 256 values <br /> S. SEPTIC TANK Capacity 5 75o a5o 29a in me <br /> 6 900 525 332 Class I, <br /> �-- �'Zso allons (see ure C-1) S�PT�� � 1°5° 6°° 3�o u,orm <br /> g �g 8 1200 675 408 columns. <br /> I-- (E-�U ('a q'�-t-c��-� ��-r�l�' T�-�IL <br /> C. S�ILS (refer to site evaluation) c-1: �T�t�' •• �'° �� <br /> Numbec of Minimum li wd with liq���� <br /> j. S t Bedrooms GP��Y� B�8�ry� ����` <br /> 1. Depth to restricting layer= feet uh��a� <br /> 2. Depth of percolation tests = i • � feet 2a� �so i�u <br /> 3 ora i000 tsoo tsoo <br /> 3. Texture �--c•�-�t s o�6 isoo a�so ''0°° <br /> Percolation rate 3 i mpi ��8�9 2°°° 3°°° �0 <br /> 4. Soil loading rate �.� �d/sqft(see figure D-33} <br /> 5. Percent land slope �'—� % <br /> D. ROCK LAYER DIMENSIONS <br /> 1. Multiply average design flow (A) by 0.83 to obtain required rock layer area. <br /> '75z' gpd x 0.83 sqft/gpd = �-3a sqft <br /> 2. Determine rock layer width = 0.83 sqft/gpd x linear Loading Rate LLR <br /> 0.83 sqft/gpd x i�- Qpd/sqft = �f' ft Mound LLR <br /> 3. Length of rock layer = area =width = <br /> ��G sqft (D1) = r� � cD2� _ �� ft < 120 MPI <12 <br /> E. ROCK VOLUME > i 20 M PI < 6 <br /> 1. Multiply rock area (D1) by rock depth of 1 ft to get cubic feet of rock <br /> �3o sqft x 1 ft= 3� cuft <br /> Z. Divide cuft by 27 cuft/cuyd to get cubic yards <br /> E��' cuft T 27 cuyd/cuft = �_cuyd <br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons <br /> ?�-- cuyd x 1.4 ton/cuyd = '3�- tons <br /> D-33: Absarption Width Sizing'Pable <br /> F. SEWAGE ABSORPTION WIDTH PucdationRa�t Lc�ingRatc <br /> in Minutes per Sod Texmre G�Iions Absorpuno <br /> tnch perdayper R¢tio <br /> fMPt uare Font <br /> Faster Uun 5 Ccwx Sand 1.20 1.00 <br /> Absorption width equals absorption ratio (See Figure D-33) �'"�'s d° <br /> F <br /> times rock layer width (D2) ,6��o ,.,�,,, o.�o ,_oo <br /> 3 i�as su�� oso �.+o <br /> Z`Ct. X �� 1 l = �`� 1 t 46 to 60 Samiy Clay 0.45 2.67 <br /> Silt Clay Laam <br /> fil to!20 S�Ity pay 0.24 5.00 <br /> Sandy Ctay <br /> la <br /> Slnwp�hnn 1'_'0• <br /> , 'Syucm Jaiynal for Noc xrib muu bc Mler w Mxfmmancc <br />