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McEnemey <br /> August 1 <br /> August 12,2002 � <br /> Page 4 <br /> NOV 0 7 2002 <br /> Septic Tank: ENVIRONMENT HEALTH <br /> PERMIT/SERVICES <br /> The calculated tank capacity calculation is described in the SJC PHS-EHD's Sewage Standards <br /> (1996). According to the Sewage Standards,a four bedroom residence should utilize a 1,600 gallon <br /> septic tank. We believe that due to the slow percolation rate of the soil, capacity should be increased to a <br /> 2,000 gallon tank. The larger tank size will allow additional time for settlement and treatment of <br /> suspended solids. A filter should be placed in the tank to block any solids from entering the leach field. <br /> Conclusions and Recommendations: <br /> Based on the percolation tests and the assumptions stated,we recommend that the septic system <br /> be composed of one(1)2,000 gallon septic tank and a total of 280 feet of leach line or 3 lines of 95 feet <br /> each. Each of the three(3) leach lines should utilize a 42-inch diameter by 25-foot deep seepage pit. The <br /> system is designed to absorb the average daily flow of 375 gallons entirely within the leach lines. The <br /> septic system factor of safety exists solely through the use of seepage pits. The seepage pits will provide <br /> limited absorption capacity and storage capacity. The calculations, percolation test field sheets, permits, <br /> and system drawings are attached to this letter. <br /> The proposed septic system should be permitted and installed according to current San Joaquin <br /> County Public Health Services, Environmental Health Division standards where applicable. <br /> Our professional services were performed, our findings obtained, and our recommendations <br /> proposed in accordance with generally accepted engineering principles and practices. This warranty is in <br /> lieu of all other warranties either expressed or implied. Test findings and statements of professional <br /> opinion do not constitute a guarantee or warranty, expressed or implied. If there are any questions please <br /> contact our office. <br /> Best Regards, <br /> D UEO� NEIL O. ANDERSON&ASSOC., INC. <br /> cj�`O wF< �c- <br /> 0 <br /> No. 2151 y <br /> r CERTIFIED -, senior David Welch, M.Sc., Senior Geologist <br /> tp GEOLOGIST �Q CEG-2151, CH - <br /> 9�OFCAS\FO PO EF ssOtiv <br /> t <br /> Neil OX �derson, P er t Z <br /> No.2245 z <br /> Geote hnical Engineer 224 wEx .3.06 m <br /> P <br /> �'C��IECViN\OP P <br /> OF,0 <br /> PpE0.pOy <br /> p 3�4 <br />