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ANIA GEOPHYSICAL GROUP, INC, <br /> x 691 , Poway, CA 92074 - T� (464) 486-1323 <br /> FAX,`j619) 486-4936 <br /> January 31, 1994 <br /> Public Health Services <br /> San Joaquin County <br /> P.O. Box 2009 <br /> Stockton, Ca 95307 <br /> RE: Quarterly Report January 1994 <br /> Darpetro Service Station <br /> 749 E. Charter Way <br /> Stockton, Ca. <br /> Site # 1060 <br /> The site was sampled on January 14 , 1994 and the laboratory <br /> analyses of the water samples were done by Sherwood Labs of <br /> Hilmar, California. The water table measurements, sampling <br /> sheets and chain of custody are attached. <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 . <br /> The water samples were obtained by using a pre--cleaned stainless <br /> steel bailer and a new section of rope. This was performed after <br /> the 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 /> 1 <br /> FINDINGS <br /> The groundwater flow remains to the northeast at a gradient of <br /> 0. 00628 Ft/Ft. The groundwater level has risen about 0 . 5 feet <br /> since the last readings and the gradient bearing has shifted <br /> slightly to the north. <br /> The groundwater contamination remains the same as in the past. <br /> Well MW-7 still has high readings and we believe this <br /> contamination is not coming from our site. <br />