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Lv ...O� <br /> LJune 4, 2004 <br /> NOA Project Number: E04065A <br /> 4.0 GROUND WATER INFORMATION <br /> 4.1 Ground Water Depth and Gradient <br /> The San Joaquin County Flood Control and Water Conservation District (1998 and 1999) <br /> ` ground water depth and elevation maps were reviewed to determine the ground water levels <br /> near the Site. The Fall 1998 and Spring 1999 maps are the most current official maps available <br /> from the county. According to these maps (Plates 3-6), ground water lies between 110 and 135 <br /> 60. feet below ground surface in the vicinity of the Site and flows to the north at a rate of <br /> approximately five to ten feet per mile. <br /> 4.2 On-Site Ground Water <br /> ` On file with EHD for the address of the subject property were three well-related permits. <br /> The first, dated August 28, 1978, was for the installation of a new domestic well. The depth <br /> to the grout seal was listed as 50 feet. The second permit, dated October 5, 1978, was for <br /> pump installation to the previous well. The third permit, dated April 9, 1986, was for pump <br /> installation and system repair permit for the same well. An agricultural well at the southeast <br /> corner of the Site was also depicted on this permit. <br /> During the June 2°d interview,Ms. Cook indicated that she is aware of only one domestic and <br /> ` one agricultural well on the Site. She stated that she uses the domestic well for the residences <br /> and the agricultural well to irrigate the pasture land. She did not report any problems with <br /> the wells. The well locations are indicated in Plate 1. <br /> No ground water was encountered by the staff of Neil O. Anderson & Associates, Inc. during <br /> drilling to a depth of 25 feet on June 1, 2004. <br /> 4.3 Potential Ground Water Contamination Issues <br /> Identifying potential ground-water contamination sources was not part of the scope of work <br /> for the soil suitability study. Potential ground-water contamination can occur from a number <br /> of sources which often include leaky underground storage tanks, agricultural activities, dairies, <br /> septic systems, and storm water infiltration. Any agricultural activities, dairies, or use of <br /> septic systems in the area should be considered potential ground-water contamination sources. <br /> v <br /> b. 5 �I <br />