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June 27,2005 NOA Pro)ect Number: E05087A ! # 4.0 GROUND WATER INFORMATION 4.1 Ground Water Depth and Gradient The San Joaquin County Flood Control and Water Conservation District (1998 and 1999) ground � water depth and elevation maps were reviewed to determine the ground water levels near the Site. ! I The Fall 1998 and Spring 1999 maps are the most current official maps available from the County. i According to these maps (Plates 3-6),ground water lies between 60 and 70 feet below ground 1^ surface and flows at a gradient of about five to ten feet per mile to the east in the vicinity of the Site. No ground water was encountered by the staff of Neil O. Anderson&Associates, Inc. during the drilling of two percolation test holes to a depth of three feet onJune 20, 2005. 4.2 Potential Ground Water Contamination Issues Identifying potential ground-water contamination sources was not part of the scope of work for the soil suitability study. Potential ground-water contamination can occur from a number of sources which often include leaky underground storage tanks, agricultural activities, dairies, septic systems, and storm water infiltration. Agricultural activities and the use of septic systems in the: area should be considered potential ground-water contamination sources. Please see section 4.4 for additional water quality details. 4.3 Water Sample Location One agricultural well exists on the site according to Mr. Lagorao (personal communication June 24, 2005). This agricultural well will continue to serve the orchards after the ro osed develo mens is completed. No well permits were tounct tor esite =ring file review at E Don.June 11,2 5. A water sample was taken from a spigot of the domestic well on the adjacent property owned by the Fi client by Mr. Conor McGee of our office on June 20, 2005. 4.4 Water Sample Constituents The water sample was analyzed for nitrate and DBCP. DBCP was not detected in the water sample. Nitrate was found at 7.46 mg/L-NO3, below the maximum contaminant level (MCL) of 45 mg/L- NO3 set by the United States EPA. The analytical reports prepared by Precision Enviro-Tech can be found in the appendix of this report. Well construction, seals, age and depth of the well screens may play significant part in assessing the Fj'i levels of Nitrate and DBCP in various aquifers. Without knowing specific details regarding well construction and condition,it would be difficult to accurately comment of the condition of the aquifer. Essentially, the water sample concentration approximately indicates the constituent 5 4t