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May 25,2001 Job Number:LGOI-115 Page 12 The depth to ground water was shown to be about 65 to 73 feet for the area. The nitrate level measured in the water well was found to be 17 mg/L as NO3 (3.1 mg/L-N). The Environmental Protection Agency maximum contaminate level for drinking water for nitrate and nitrate as nitrogen is 45 mg/L-NO3 and 10 mg/L-N respectfully. No DBCP was found in the ground water. The nitrate loading analysis has shown that the use of a"typical'septic system will not cause a build up of nitrogen in the shallow aquifer above the maximum contaminate level of 10 mg/L-N for the five(5) 2-acre parcels and the one(1) 110-acre parcel. Based on the results of this study,the project is suitable for the proposed development. Parcel 6 will not require any engineered septic system, however Parcels 1-5 will require an engineered design to mitigate the slow percolating soils measured on Parcels 1-5. The recommendations for the project are as follows: 1) Due to the unsatisfactory percolation rates measured on Parcels 1 through 5, and engineered septic system will be necessary on those parcels. Parcel 6 had a satisfactory percolation rate and does not require an engineered system. 2) Follow San Joaquin County Public Health Services Sewage Standards where applicable. IX. LIMITATIONS The conclusions of this report are based on the information provided regarding the existing and proposed development, the use of the subject property, and the site conditions as they existed at the time we excavated our test holes and performed the percolation tests. It was assumed that the test holes and percolation test results are representative of the subsurface conditions in the general area.