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1 <br /> CALIFORNIA GEOPHYSICAL GROUP, INC, <br /> r7,.,ir r yFe.r— � FAITH <br /> P O Sox 691 , Poway, CA 92074 'i 1 ,,, Tel (619) 486-1323 <br /> may 8, 1993 F ' ' �'� '``��� FAX. (619) 486-4936 <br /> 17f+ 08 <br /> Public Health Services <br /> San Joaquin. County <br /> P 0. Box 2009 <br /> Stockton, Ca 95307 <br /> RE Quarterly Report April 1993 <br /> Darpetro Service Station <br /> 749 E. Charter Way <br /> Stockton, Ca <br /> Site # 1060 <br /> The site was sampled on April 15, 1993 and the laboratory <br /> analyses of the water samples were done by Sherwood Labs of <br /> Hilmar, California The water table measurements, sampling <br /> N parameters and chain of custody are attached <br /> s <br /> Table i lists the history of the water analyses taken at the <br /> site since Jan 26, 1990 Table II is the history of the water <br /> table measurements, and Table III list the history of hydraulic <br /> gradients Table IV shows the calculations for the hydraulic <br /> conductivity at the site Attached is one water table <br /> elevation plot showing the approximate groundwater gradient and <br /> the plots for the hydraulic conductivity calculations <br /> The water samples were obtained by using a pre--cleaned teflon <br /> bailer and new section of rope. This was performed after the <br /> measured field parameters had stabilized during the purging <br /> operation. See protocols. Water samples were placed in <br /> appropriate glass containers with teflon-lined lids. <br /> UMIN s <br /> The water table elevation has risen about 2. 5 feet The bearing <br /> of the hydraulic gradient has shifted to the south 64 degrees <br /> and is now S86E. <br /> The contamination in Well 4 has increased The level of <br /> contamination in Well 5 is reduced, and in Well 6 the level <br /> remains about the same. <br /> On March 23, 1993, we attempted to pump out any remaining <br /> floating product from Well 5 We were unable to remove any <br /> measurable amount of fuel . This activity was reported in our <br /> activity report of March 29, 1993. <br /> `rY <br /> L - <br />