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yam• �, <br /> Chevron U.S.A. <br /> Page 14 <br /> 7.2 -)Undwater Conditian5 <br /> The field study and well installations have been on-going at the subject site <br /> since mid-190. The groundwater depth was reported to be approximately 25 ft below <br /> the site's grade. Due to the recent years of drought,the groundwater surface has <br /> continuously dropped to the present depth of approximately 39 ft below the site's <br /> grade. Dames &Moore's recent groundwater depth measurements at the subject site hav <br /> shown approximately a 3-ft drop over a five-month period. <br /> _ Regional groundwater flow is interpreted to be in a northeasterly direction, as <br /> per San Joaquin County Flood Control and Water Conservation District's."Lines of Equal <br /> Elevation of Water in Wells", Spring 1988. Measurements from monitoring wells at the <br /> subject site since 1988 have reportedly shown the groundwater flow interpreted to be <br /> north, northeasterly. The results of our current depth-of-groundwater measurements <br /> also shows and interpreted flow direction of north,northeast. <br /> r.a 7.3 Grr undwater 0radient Assessment <br /> Each well head was surveyed on March 22, 1980 and April 24, 1990,following each <br /> date of well installation. The survey was completed by Ed Dunkel&Associates of <br /> w Fresno, California who referenced the surface elevation to a City of Stockton <br /> benchmark. The survey data was utilized to help evaluate groundwater surface <br /> elevations and groundwater gradient assessments. The survey was performed to <br /> establish the top of well casing elevation relative to a United States Department of <br /> Commerce, National Geodetic Survey benchmark. Subsequent to the survey, the depth to <br /> 16000-ZOe-l16! <br /> DANWS & MOORE <br />