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i <br /> i Quarterly Ground-Water Monitoring October 4, 1989 <br /> Beacon Station No. 22-1, Lockeford, California AGS 87048-2 <br /> j <br /> measured to the nearest 0.01 foot using an automatic level. The depth to water was <br /> measured in each well to the nearest 0.01 foot with a Solinst electric water-level indicator. <br /> An arbitrary elevation relative to mean sea level (MSL) of 100 feet was chosen for the well <br /> casing with the highest measured elevation. This corresponds to the approximate MSL <br /> i elevation of the site as shown on the topographic map. The well with the highest elevation <br /> was well MW-3. <br /> I <br /> These data are summarized in Table 3 and were used to evaluate the relative elevation of <br /> j the ground-water surface in each well, prepare a Ground-Water Gradient Map (Plate P- <br /> 3), and evaluate the slope of the ground-water surface across the site. The evaluations <br /> indicate that the average slope of the groundwater surface was in a southwesterly direction <br /> at the time of the measurement (August 2, 1989). The evaluated gradient was 0.003. <br /> r Ground water from three of four wells at the site is at or near drinking-��ater quality as <br /> j defined by the DHS. Hydrocarbon constituent levels in the four wells remain lower than <br /> those initially obtained. We recommend monitoring of ground-water quality in the <br /> monitoring wells on a semiannual basis as a sufficient response to site conditions. We are <br /> scheduling the next sampling event for February 1990. <br /> I� <br /> Copies of this report should be forwarded to Ms. Laurie Cotulla of the San Joaquin Local <br /> Health District, P.O. Box 2009, Stockton, California 95201, and Mr. Gordon Boggs of the <br /> California Regional Water Quality Control Board, Central Valley Region, 3443 Routier <br /> Road, Sacramento, California 95807-3018. <br /> i <br /> i <br /> I <br /> 3 <br /> E <br /> Y -- Applied GeOSYSAVns <br />