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, MOUND DESIGN WORK SHEET(For Flows u to 1200 d) <br /> A. Average Design FLOW A-1: Estimated Sewage Flowa in Gallons per Day <br /> num er o <br /> Estimated (000 gpd (see figure A-1) bedrooms Class I Class II Clasa III Class iV <br /> or measured --- x 1.5 (safety factor) _ — gpd 2 300 225 �80 � <br /> , 3 450 300 218 ofthe <br /> 4 b00 375 256 values <br /> B. SEPTIC TANK Capacity 5 750 450 294 in the <br /> 6 900 525 332 Classl, <br /> l��o � �,c i�., gallons (see gure C-1) � 10� � 3�o n,or m <br /> -r1F 5 lunv e�«� P�M,,4'r� 8 1200 675 408 columns. <br /> ' /nv s� ?►.lwt�'P r d <br /> , C. SOILS (refer to site evaluation) C-1: Se ticTankCa acities(iu allons <br /> �) '( Number of Minimum Liquid Liquid capxi W�� Vquid capacity <br /> 1. De th to restrictin la er = �V � ��S Bedroorns Ca xi ty W��d�sposal& <br /> P g y �E6� P �Y B�age disposal lifl inside <br /> 2. Depth of percolation tests = feet z�ie� �so i�2s <br /> 3. Texture L�..d��( �-od�� 3wa �000 �Soo 150° <br /> zoao <br /> Percolation rate 1�~3O mpi �Ss�9 i000 3Zoso�o 300° <br /> 4. Soil loading rate .�� gpd/sqft(see figure D-33) <br /> 5. Percent land slope 4-- c. % <br /> D. ROCK LAYER DIMENSIONS <br /> ; 1. Multiply average design flow (A) by 0.83 to obtain required rock layer area. <br /> (000 gpd x 0.83 sqft/gpd = �sqft���7a� 5+-}�"� <br /> 2. Determine rock layer width = 0.83 sqft/gpd x linear Loading Rate (LLR <br /> 0.83 sqft/gpd x_ / a. gpd/sqft= JO ft Mound LLR <br /> 3. Length of rock layer = area=width = <br /> �4 7 sqft (D1) = 10 ft (D2) = s�_ft < 120 M PI <� 2 <br /> E. ROCK VOLUME > 120 M PI < 6 <br /> 1. Multiply rock area (Dl) by rock depth of 1 ft to get cubic feet of rock <br /> S 4 '� _ sqft x 1 ft=�',�2 cuft <br /> 2. Divide cuft by 27 cuft/cuyd to get cubic yards <br /> 54� cuft =27 cuyd/cuft= �0 cuyd <br /> 3. Multiply cubic yards by 1.4 to get wei ht of rock in tons <br /> �� cuyd x 1.4 ton/cuyd =_3� tons <br /> D-33: Absorption Widlh Sizing Table <br /> F. SEWAGE ABSORPTION WIDTH ����•�;��« LoadingRale <br /> in Minutes per Soil Texturc Gallons Absorp�ion <br /> Inch per day per Ratio <br /> ��, Mp� s uare foot <br /> Fasur than 5 Coarae Sand 1,2p �,pp <br /> Medium Sand <br /> Absorption width equals absorption ratio (See Figure D-33) �-OflmySend <br /> times rock layer width (D2) 16 to 30 �oe,,, o.�o Z.00 <br /> s� 3��o as �i��.,n o.so s.ao <br /> ��� X �N ft =�_f t 46 to 60 S�dy C7ay 0.45 2.67 <br /> Silry Clay I.00m <br /> 61 to 120 Silly Clay 0.24 5.00 <br /> Sandy Gay <br /> I <br /> Sloww�han 120• <br /> •Sya�em duigped for t6ese aoil�m�s1 be qher or perfomrncc <br />