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STATE OF CALIFORNIA GEORGE DEUKMEJIAN,Governor <br /> `CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— � <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD <br /> SACRAMENTO,CA 95827-3098 <br /> KECEIV'"D, <br /> MAY 1 1 19ptt <br /> 9 May 1990 ENVIRONMENTAL HEALTH <br /> �—` PERMIT/SERVICES <br /> Mr. Brian Garber <br /> Aegis Environmental Consultants <br /> 801 Riverside Avenue, Suite C <br /> -Ros'ev i-l'1 e,CA 95678-`- <br /> SITE <br /> 5678 SITE ASSESSMENT, CALIFORNIA FUELS, 838 MOKELUMNE STREET, W0008 RIDGE, SAN <br /> JOAQUIN COUNTY <br /> We have reviewed the Problem Assessment Report, dated 16 March 1990, which <br /> presents the results of the soil and ground water investigation at the subject <br /> facility. Included in the report is a discussion of the extent of soil <br /> contamination, hydrocarbons in the ground water, and a characterization of <br /> stockpiled soil from the excavated area. Ground water direction was <br /> determined by measuring water levels in the three on-site ground water <br /> monitoring wells. <br /> There are no ground water monitoring wells downgradient of the excavated area, <br /> as indicated by the local ground water flow determined in the report. It was <br /> discussed in our 7 December 1989 letter that additional wells may have to be <br /> installed once the local ground water direction has been determined. At least <br /> one well should be installed downgradient of the excavated area to assess the <br /> quality of the ground water potentially impacted by the hydrocarbon- <br /> contaminated soil , now excavated. <br /> The existing and the new ground water monitoring well(s) should be sampled for <br />- - one-year - on a- quarterlly basis -for; benzene ethyl-benzene, toluene-, xylene;- <br /> lead, total petroleum hydrocarbons, and water levels to assess if there is <br /> contamination. After a year, we will evaluate whether or not the wells can be <br /> abandoned. <br /> If you have any questions, please call me at (916) 361-5673. <br /> &U414, Y. <br /> TWILA L. LECLERC <br /> Area Engineer <br /> TLL <br /> cc: 04s• Eleanor Ratliff, San Joaquin County Public Health Services, tockton <br />