Laserfiche WebLink
1 <br />' CALIFORNIA GEOPHYSICAL GROUP, INC. <br /> O Box 578341, Modesto, CA 95357 Tel (209) 527-1247 <br /> August 30 , 1994 Fax (209) 527-4810 <br /> Public Health Services <br /> San Joaquin County <br />' P.O. Box 2009 <br /> Stockton, Ca 95307 <br />' RE: Quarterly Report July 1994 <br /> Darpetro Service Station <br /> 749 E. Charter Way <br />' Stockton, Ca. <br /> Site # 1060 <br />' The site was sampled on July 20, 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 /> parameters and chain of custody are attached. <br /> Table I lists the history of the water analyses taken at the site <br />' since Jan. 26 , 1990 . Table II is the history of the water table <br /> measurements, and Table III list the history of hydraulic <br /> gradients. Attached is one water table elevation plot showing <br /> the approximate groundwater gradient. <br /> The water samples were obtained by using a pre-cleaned steel <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 /> 1 FINDINGS <br />' The groundwater flow is to the East southeast at a gradient of <br /> 0.0051 Ft/Ft. The groundwater level has fallen about 0 . 3 feet <br /> since the last reading. Figure 1 shows the water table <br /> elevations. It appears that a localized anomaly in the <br />' groundwater was present on the site at the time of sampling. <br /> The contamination pattern remains similar to those in the past. <br />' Well MW-4 has less contamination and well MW-7 has more <br /> contamination. This appears to be due to the anomaly in the <br /> groundwater. <br />' CONCLUSIONS <br /> Quarterly monitoring will continue. <br /> 1 We have finally obtained the encroachment permits to drill the <br /> wells proposed in the present work plan. These permits were <br />' Page 1 <br /> 1 <br />