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_ June 13, 2005 NOA Project Number: E05071A Table 5. Summary of Percolation Tests. Test No., Percolation Percolation Rate Test Comment Date Tested Test Depth(ft) (minutes/inch) Duration (see notes) P-1 shallow,6-7-05 3.40 125 4-hr Unsatisfactory percolation rate, fail P-2 dee 6- - 8.18 25 4-hr Satisfactory percolation rate Note: A satisfactory percolation rate for a"shallow"test is less than or equal to 60 minutes per inch. / A satisfactory percolation rate for a"deep"test is less than or equal to 30 minutes per inch. 6.7 Discussion of Percolation Test Results The soils within the sewage disposal area for the subject property have demonstrated a satisfactory percolation rate in accordance with the requirements of the EHD for the use of a standard septic system. !/6.8 Discussion of Septic System Sizing Septic System Construction and sizing should follow the San Joaquin County On-Site Wastewater Disposal Standards where applicable. Based on out client's contact with Mr. Mike Huggins of the Environmental Health Department,we understand EHD had recommended a leach line and sump septic system to maintain a minimum distance of 100 feet from the closest well to the subject property. The sump should not be any_Jeeper than eig t feet to meet the minimum 100- oot setback _ from the closest well to the subject property. ,/1/7.0 CONCLUSIONS In summary, a satisfactory percolation rate of the soil was achieved in the proposed septic disposal area on the Site. The site appears to be suitable for a standard septic system in accordance with the discussion in the previous Section 6.8. No ground water was encountered in any of the borings drilled on the property. The on-site water well was tested for nitrate and DBCP. DBCP was non-detectable, and nitrate concentration in ground water was found to be 21.1 mg/L-NO3,which is below the maximum drinking water contaminant limit of 45 mg/L-NO3. 10