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" MO�iJND DESIGN WORK SHEET(For Flows u to 1200 d <br /> A. Average Design FLOW A-t: Estimotod Sewa�e Flows M Gailons per Day <br /> Estimated ��gpd(see fcgure A-1) bedroom: claa� qaa u c�au�n c�au�v <br /> or measured x 1.5 (safety factor) = gpd 2 � � �� � <br /> 3 . 450 300 218 of the <br /> 4 600 375 256 values <br /> B. SEP'TIC TANK Capadty 5 75o aso 2qa. in me <br /> 6 900 525 332 Closs I, <br /> a - 100o gallons (see figure C-1) ���^�c,� � » � 3�o ii,or m <br /> I - t Sod �U�- C.b?��`r✓1�5'�^�- f�-t►���� �s� S 1200 675 408 columns. <br /> C. SOILS (refer to site evaluation) c�: ticihntG citks � <br /> , � � Numba o� Miniowm� liq�d cqaciry with w�'�th ddispo�sal& <br /> 1. Depth to restricting layer= z . feet B� ��' �� i�a��a� <br /> 2. Depth of percolation tests= /. c� � feet 2«� �so i��s �� <br /> 3. Texture ��-� tx�v✓► s a 6 is�ao � � � <br /> Perco la t ion ra te 5•� mpi �,sa9 2000 �000 <br /> 4. Soil loading rate .�1S gpd/sqft(see figure D-33) <br /> 5. Percent land s�ope 3 % <br /> D. ROCK LAYER DIMENSIONS <br /> 1. Multi ly average design flow (A)by 0.83 to obtain required rock layer area. <br /> 0 gpd x 0.83 sqft/gpd =_3�3 sqft-����o='���° <br /> 2. Determine rock layer width= 0.83 sqft/gpd x linear Loading Rate (LLR <br /> 0.83 sqft/gpd x 1'z Qpd/sqft= !� � Mound LLR <br /> 3. Length of rock layer= area+width= <br /> '° Sqr�c�1�+ ��c�2> _-�-ft < 120 M PI <12 <br /> E. ROCK VOLUME > 120 M PI < 6 <br /> 1. Multiply rock azea (Dl)by rock depth of 1 ft to get cubic feet of rock <br /> 410 sqft x 1 ft= �-i 1'J cuft <br /> 2. Divide cuft by 27 cuft/cuyd to get cubic yards <br /> 41� cuft +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 =�_tons <br /> A33: AMorption Wldth bwzin�1Lbie <br /> PareolWon Rats Lodins Ra�e <br /> F. SEWAGE ABSOItPTION WIDTH �p,,��..,�► sa,z.�.. c.i� A��«� <br /> ln�h perd�y Ra6o <br /> F�tler tlm�S Co�ne S�d 1.� 1.00 <br /> Mediuro S�nd <br /> Absorption width equals absorption ratio (See Figure D-33) `A'°"'S"'° <br /> times rock layer width(D2) �o � <br /> .c. x lc� ft= a�, ft ,�a� �Ya.,, o..� Z.6� <br /> Sil Q�lam <br /> 61 to 120 SII d� 0.24 5.00 <br /> Clay <br /> . •S d�d{eWBort�rt��oiMmrlbotWra a�noea � <br />