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. a••'� "'� Job#� <br /> Tqw�swrt <br /> Praos�ewy <br /> Universi of Minnesota Mound Design Worksheet Site A <br /> Greaterthan 1X Slopea <br /> a F�ow <br /> EsUmated 750 gpd(see figure A-1) <br /> or m�sured x t.5(saFety factor)= U 9Pd <br /> B. SEPTIC TANK LIQUID VOLUMES <br /> Septic tank capaaty 2250 gallons(see figure G1) <br /> Number d t�ksloanpardnents 0 <br /> Eflk�ent Fllte�' (Y��) Y� <br /> C-1 Septic Tank Capsdly in Gallons <br /> Number of Minirt�m Capaciry with Capaaty with <br /> Bedraonu Capac�tty C�,arb.asp. Oisp.and l.ift <br /> 2 or ;;��;`� ; 1 25 �; F„ ,< <br /> �� � � <br /> 3 or 4 ��,� �- 1500 ,�: ��; <br /> ''� �r�s' _ � :: <br /> ;a,' <br /> 5 or6 � 7250 ' ` �: <br /> 7 8a9 ,F� , c 1` � �� $,� <br /> � <br /> C. SO�S(Site evaluatia�dataJ <br /> 1. Depth to restricting layer- 1.8 feet <br /> 2. Depth af penoolation tests= 12 inches <br /> 3. Texdme bam <br /> 4. Sa'I Ioa�ng r�e(sse F'igure D-33) 0.60 �� <br /> Peroolalion rarte 6 MPI <br /> 5. 96 Land Sbpe 2.0 % <br /> D. ROCK LAYER DIMENSIONS <br /> 1. Mulbply average design flow(A)by 0.83 to o�ain required area of rock layer:Item A x 0.83= <br /> 750 gpd x 0.83 ft�lgpd= 630 ft <br /> 2. D�ermine rodc layer width =0.83 R`/gpd x Linear Loading Rate(LLR)(see LLR chart <br /> 0.83 ft Igpd x 12.00 = 10.0 ft <br /> LLR Chart <br /> Peric Rate LLR <br /> <120 MPI <=12 <br /> >=120 MPI <� <br /> 3. Length of rodc layer=a�ea divided by width= <br /> 830.0 ft� / 10.0 feet= 63.0 ft <br /> E. ROCK V�.UME <br /> 1. MutGply rock area by rodc depth to get cubic feet of rock <br /> 630.0 X 1.0 ft= 630.0 ft3 <br /> 2. Divide ft by 27 ft3tyd3to get cubic yards <br /> 630.0 ft3 / 27 = 23.3 yd3 <br /> 3. Mul6ply cubic yards by 1.4 to get weJght of rock in tons; <br /> 23.3 yd3 X 1.4 tonlyd3 = 32.7 tons <br /> Page 1 of 5 <br />