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�I <br /> August 8, 2006 <br /> i NOA Project Number: E06087A <br /> ?�1�7 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) ground <br /> water depth and elevation maps were reviewed to determine the ground water levels near the Site. <br /> i The Fall 1998 and Spring 1999 maps are the most current official maps available from the county. . <br /> According to these maps (Plates 3-6),ground water lies between 60 and 70 feet below ground <br /> C `` surface in the vicinity of the Site. The groundwater appears to flow to the east through the <br /> 2'iJ immediate vicinity of the Site. <br /> No ground water was encountered by the staff of Neil O. Anderson&Associates, Inc. during the <br /> drilling of the percolation test holes to a depth of 25 feet on July 26, 2006. <br /> 4.2 Potential Ground Water Contamination Issues <br /> Identifying potential ground-water contamination sources was not part of the scope of work for the <br /> soil suitability study. <br /> Potential ground-water contamination can occur from a number of sources which often include <br /> leaky underground storage tanks, agricultural activities, dairies, septic systems, and storm water ( � <br /> infiltration. Any past agricultural activities and the present use of septic systems in the area should <br /> i be considered potential ground-water contamination sources. <br /> r 4.3 Water Sample: Location <br /> Two well permits were found for the subject property address during file review at EHD on July 25, <br /> 2006. One permit was issued to William Hodges on August 7, 1982 and is for the destruction of an <br /> old=omesti d— <br /> c- ell at 11130 North Highway 99.The second permit is for the installation of anew <br /> ell a 11130 North Highway 99, issued to Walter Martin on September 30, 1976. <br /> awings on both well permits and septic permits,it appears as though the old well <br /> was destructed in order to install the new septic system. One well appears to exist on the Site. <br /> A water sample was taken from a faucet near the well on July 24, 2006 by Mrs. Nancy R. Kramer. <br /> (Plate 1). L` <br /> # _t <br /> 4.4 Water Sample Constituents <br /> The water sample was analyzed for nitrate and DBCP. The results of this water test are forthcoming. ('V-"o <br /> � ,[iJ�7�T.�7%�Gr4�S .4'iG��� /�./� -Gib-Z��-C!.►f�J�'� <br /> v s <br /> f <br />. � 5 <br />{ <br />