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1 V June 3, 2004 NOA Project Number: E04049A 4.0 GROUND WATER INFORMATION L 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. The Fall 1998 and Spring 1999 maps are the most current official maps available from the county. According to these maps (Plates 3-6), ground water lies between 60 and 75 6. feet below ground surface in the vicinity of the Site. Due to the complex shape of the contours in the area, it is difficult to measure the gradient. However, groundwater appears to Lflow to the south or southeast through the immediate vicinity of the Site. 4.2 On-Site Ground Water On file with EHD for the address of the subject property was one new domestic/public well L installation permit, dated February 20, 1979. According to this permit, the depth to the grout seal for this well was 50 feet. A second well, to an approximate depth of 70 feet, was abandoned at the same time. During the May 19ib interview,Mr. Serrano indicated that he is aware of only one well on the Site, the domestic well for his residence. He did not report any problems with his well. The Llocation of the well is indicated in Plate 1. No ground water was encountered by the staff of Neil O. Anderson & Associates, Inc. during drilling to a depth of 25 feet on May 18, 2004. 4.3 Potential Ground Water Contamination Issues Identifying potential ground-water contamination sources was not part of the scope of work j for the soil suitability study. Potential ground-water contamination can occur from a number r. of sources which often include leaky underground storage tanks, agricultural activities, dairies, septic systems, and storm water infiltration. Any agricultural activities, dairies, or use of septic systems in the area should be considered potential ground-water contamination sources. L L L 6 L