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STATE OF CALIFORNIA <br /> GEORGE DEUKMEJIAN,Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 95827-3098 <br /> 17 November 1989 <br /> NOV 22 1989� s:: <br /> Ms. Eleanor Ratliff I E,Rm, E -` <;:.f � <br /> Registered Environmental Health Specialist ``' "L� <br /> San Joaquin County <br /> Department of Public Health Services <br /> P.O. Box 2009 C <br /> Stockton CA 95201 <br /> PROPOSED ARCO SERVICE STATION, NORTHEAST CORNER OF MAIN AND INDIANA STREETS, <br /> WOODBRIDGE, CLOSURE OF MONITORING WELLS <br /> We have reviewed the 11 September 1989 "Report of Soil and Ground Water" <br /> prepared by Applied Geosystems for this site. According to the report, <br /> hydrocarbon contaminants were detected in soil at relatively low levels: <br /> toluene - 92 ppb, xylene - 280 ppb; no benzene or total petroleum hydrocarbons <br /> (TPH) were detected. The analytical detection limits for these soil samples <br /> were 2.0 parts per million (ppm) for TPH, and 0.05 ppm for benzene. No <br /> hydrocarbon contaminants were detected in ground water samples obtained from <br /> the three on-site ground water monitoring wells. Arco has requested <br /> authorization from the San Joaquin County Department of Public Health Services <br /> to abandon the three existing monitoring wells. <br /> Prior to authorizing the abandonment of these wells, you have requested <br /> concurrence from the Regional Water Quality Control Board for abandonment of <br /> the monitoring wells. <br /> Based on this limited soil and ground water investigation report, we do not <br /> believe that the reported levels of soil contamination represent a threat to <br /> water quality. However, because contaminants were found, Arco should be aware <br /> that they may migrate to ground water at a later time. Should this occur, or <br /> new information be developed, Arco may be required to perform a site <br /> investigation in the future. <br /> We do not object to abandonment of the monitoring wells. However, prior to <br /> abandonment, the wells should be resampled to verify the results of the <br /> initial investigation, and Arco should file the reports required by Section <br /> 13250 of the Water Code. <br /> If you should have any questions, please call me at (916) 361-5731 . <br /> THOMAS D. PELTIER <br /> Engineering Geologist <br /> TDP/GLB/tdp <br />