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CALIFORNIA GEOPHYSICAL GROUP, INC. <br /> P O Box 578341, Modesto, CA 95357 Tel (209) 527-1247 <br /> August 8 , 1995 Fax (209) 527-4810 <br /> Public Health Services iY ' <br /> San Joaquin County ^ � <br /> 09 I P.O. Box 20 = ' c� 1995 <br /> Stockton, Ca 95307 <br /> ='\'V'R0N'VI1EN IIAL HLAL-FI <br /> RE: Quarterly Report July, 1995 <br /> PE_RM1TISFRV,CrS <br /> Darpetro Service Station <br /> 749 E. Charter Way <br /> Stockton, Ca. <br /> Site # 1060 <br /> The site was sampled on July 25, 1995 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 lasts 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 last 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 bailer. <br /> This was performed after the measured field parameters had <br /> I stabilized during the purging with a pump. See protocols. Water <br /> samples were placed in appropriate glass containers with teflon- <br /> lined lids. <br /> fFINDINGS <br />' The groundwater flow is to the Northeast at a gradient of 0 .0030 <br /> Ft/Ft. The groundwater level has risen about 0. 63 feet since <br /> the last quarterly reading. Figure 1 shows the water table <br /> elevations. <br /> Gasoline contamination is present in all of the wells above the <br /> California Action Levels. Well BM-9 had TPH contamination of <br />' 23800 ug/kg, which is almost twice the amount of contamination <br /> found in well BM-7 . Well BM-7 is located closer and up gradient <br /> to the contamination source on this site, therefore, the <br />' contamination found in BM-9 is suspected to have originated from <br /> another source. <br /> CONCLUSIONS <br />' The next quarterly monitoring will take place in October, 1995. <br /> Page 1 <br />