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The test results show ND for DBCP and 10.4 mg/L for Nitrate. No groundwater was encountered in the 25' soil profile hole. Moist clay and sand were encountered in the 25' soil profile hole. SOIL PROFILE AND PERCOLATION TESTING The soil profile observed in the field indicates a tight layer of course to medium soil with predominat clay component. The sandy layer at T was moist. See Soil Profile Report by Kleinfelder. The four hour percolation test was satisfactory for a single family residence. The clay isvery tight and not conducive to satisfactory percolation. The sand layer at 7 feet should support the needs of a single family residence. Should the leach field be constructed at another location it is important to verify the sand strata is present. The percolation test report is included in this report. As ecvidenced by the percolation results the selected site for the leach field is conducive to percolation of clear sewage effluent. The rate was observed by Mr. Ted Norgard, REHS, San Joaquin County Public Health Services, 304 E. Weber Ave., Stockton, California. SEPTIC TANK AND LEACH FIELD A gravity sewer system will serve one single family residence on this parcel. A standard l y structurallvsound and watemroof, 1500 gallon two-compartment tank is recommended. The residential sewage system bulletin published by the Environmental Health Division of the Public Health Services is included in Appendix C for the property owner's information. -74 S The leach field area should be 8,000 S.F. The use of a garbage disposal requires periodic inspection of the tank more often than normal use without a disposal. To protect the leach field a gravity effluent filter should be installed with riser to the surface and sealed lid. This provides easy access to clean and inspect the filter every two years or as often as indicated by periodic inspection. The 4" Biotube Effluent Filter by Q5I or equal, is recommended. (541) 459-4449. See Appendix D for a description of the Biotube Filter. The septic tank should be pumped out when solids begin to clog the filter or sooner.(Every 5 to 8 years) The most efficient septic tank is the Meander Tank by Willamette Grayston Inc., Eugene, Or.(Cost: $880 FOB) CONCLUSION The septic system must be installed in conformance with existing San Joaquin County Standards, by permit.Based on the available data, there should not be any adverse impact to the local groundwater from the properly installed and maintained septic system. Pits are required to take advantage of the sand strata. A document search at the Environmental Health Division for septic repair or modification was made and findings follow: