Laserfiche WebLink
CALIFORNIA GEOPHYSICAL GROU <br /> O Box 578341, Modesto, CA 95357 e REPORT ACCEPTED BY RD= LISTON <br />' August 22 , 1996 <br /> Public Health Services GonvrutrnG � <br /> San Joaquin County B r� <br />' P.O. Box 2009 <br /> Stockton, Ca 95,10t <br /> J <br />' BENETO TANK LINES <br /> RE: Quarterly Report July, 1996 Roger Liston <br /> Darpetro Service Station <br />' 749 E. Charter Way 3450 EI Camino Ave 209-537-0771 <br /> Stockton, Ca. Ceres,CA 95307 Fax 209 537-9039 <br /> Site # 1060 - <br />' The site was sampled on July 25, 1996 and the water samples <br /> were sent to Sherwood Labs of Hilmar, California, who forwarded <br />' them to Associated Laboratories. The water table measurements, <br /> sampling parameters and chain of custody are attached. <br /> Table I lists the history of the water analyses taken at the site <br /> since January 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 /> lot 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 /> stabilized during the purging with a pump. See protocols. Water <br /> samples were placed in appropriate glass containers with teflon- <br /> lined lids. <br /> Wells MW-1, 2 and 3 were not measured or sampled, authorized by <br /> Mr. Steve Sasson, the county regulator. <br /> iFINDINGS <br /> The groundwater flow is to the Northeast at a gradient of 0. 0021 <br /> I Ft/Ft. The groundwater level has risen about 0 . 1 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. <br /> CONCLUSIONS <br /> The next quarterly monitoring will take place in October, 1996 . <br /> We expect to install the vapor extraction/thermal oxidization <br /> system this quarter. The site where the Thermal Oxidizer is in <br /> Page 1 <br />