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Otto Associates, Engineers and Land Sunreyors, Inc. <br /> Mound Design Worksheet (For flows up to 1200 gpd) <br /> All boxed rectangles must be entered,the resf will 6e calculated. <br /> A. FLOW /�l:Esfrna�d Scwope Ha�a in Galas Per Da�r <br /> Estimated 750 gpd(see figure A-1) �6 �� �� ��� �N <br /> or measured 0 x 1.5(safety factor)= 0 gpd 2 � � �� � <br /> B. _ SEPTIC TANK LIQUID VOLUMES 3 �0 3� 21$ ofihe <br /> Septic tank capacity 2-1500 gallons(see figure G1) d � � � � <br /> 5 750 450 24/ n ihe <br /> C. SOILS(Site evaluation dataJ 6 900 �15 332 po�� <br /> 1. Depth to restricting layer= 2 feet > >� � 370 i.a� <br /> 2. Depth of percolation tests= 12 inches <br /> 8 12m b75 408 cd�mis, <br /> 3. Texture Sandy Loam <br /> 4. Soil loading rate(see Figure D-33) p.79 gpd/� <br /> Percolaaon rate 10 MPI <br /> 5. °�Land Stope 10 °� D.� �„a,�,�g� <br /> Pa�nRse LoadarRat� <br /> C-i: Se M Tank Ntics(In onsl ��� �1� ��� �� <br /> aoc <br /> Numbcr of Minimum Liquid 13quid cap�ty with wit�h�sp�osal& F��a �s�aa i.zo i.00 <br /> Bedrooms Cap�aty ga�'ba8t di�Osa1 lih ias�ide �s.m <br /> 2 rn ltss 75Q 1125 1� 3i w a <br /> 3 ar# 1000 1500 <br /> 5 or 6 1500 2250 � +s m 60 , c�y.� au a.� <br /> 7,8 or 9 2000 3000 <br /> 61 m 120 CC� 024 3.00 <br /> ml <br /> a�c 1ZD� <br /> � e..M•a rnru..on..otr.rrsrdeere. . <br /> D. ROCK LAYER DIMENSIONS <br /> 1. Multiply average design flow(A)by 1.0 to obtain requ�ed area of rock layer:Item A x 1.0= <br /> 750 gpd x 1.0 ft?'gpd= 750.0 ft� <br /> 2. DeteRnine rock layer width =1.0 ft�/gpd x Unear Loading Rate(LLR)(see LLR chart) <br /> 1 ft�/gpd X 10 = 10.0 ft <br /> LLR Chart <br /> Perk Rate LLR <br /> <120 MPI <=12 <br /> >=120 MPI <=6 <br /> 3. Length of rock layer=area divided by width= <br /> 750 ft� / 10 feet= 75.0 feet <br /> E. ROCK VOLUME <br /> 1. Multiply rock area by rock depth to get cubic feet of rodc <br /> 750 X 1 ft= 750.0 ft3 <br /> 2. Divide ft3 by 27 ft31yd3 to get cubic yards � <br /> 750.0 ft3 / 27 = 27.8 yd3 <br /> 3. Multiply cubic yards by 1.4 to get weight of rock in tons; <br /> 27.8 yd3 X 1.4 ton/yd3 = 38.9 tons <br /> F. ABSORPTION WIDTH <br />