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t CONCLUSION <br /> The percolation test results and field analysis of the soil indicate the site is acceptable to <br /> residential on-site sewage disposal when the system is installed in conformance with existing <br /> San Joaquin County Standards and the tank manufacturer's specifications. The existing system <br /> has been in operation for ten years with no problems. <br /> A septic tank must be structurally sound, waterproof and installed according to the <br /> manufacturer's specifications. The leach field area required is 10,000 SF. It is important to protect <br /> the leach field from traffic that would compact the ground surface. The leach field area above the <br /> trenches may not be used for other purposes. A 50% expansion area must be available should it be <br /> required. <br /> The standards require a 3 bedroom residence to have 270 feet of leach field in silt or sandy <br /> clay loam. Reduction is allowed if pits are installed. The field observation cannot determine <br /> the predominate component of the soil. The conservative classification is sandy silt. If the SFR has <br /> 4 bedrooms a 1600 gal. tank is required and 320 feet of leach field. <br /> The laboratory test results of the well water indicate 3.9 mg/1 for Nitrate and ND (not detected) <br /> for DBCP. See Appendix F. No new well is proposed. There should be no adverse impact on <br /> the area groundwater from a properly installed and maintained septic system. <br /> A document search at the Environmental Health Division for septic repair or modification was <br /> not made due to distance between residences. <br /> 3. <br />