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i <br /> STATE OF CALIFORNIA <br /> GEORGE DEEJKMEJiAN Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> .ENTRAL VALLEY REGION <br /> qWFJ443 ROUTiER ROAD <br />' SACRAMENTO CA 95827 3098 <br />' 16 February 1990 RECEIVED <br /> i FEB 2 0 1990 <br />' DAMES & MOORE <br /> Mr Doug Westenhaver <br /> President <br /> American Forest Products Company <br />' 4000 Kruseway Place, <br /> Building 2, Suite 355 <br /> Lake Oswego, OR 97035 <br /> FORMER AMERICAN FOREST PRODUCTS SITE, 2801 WEST LANE, SAN JOAQUIN COUNTY - <br /> LEAKING UNDERGROUND FUEL TANK INVESTIGATION REPORTS <br />' We have reviewed the 4 November 1987 Soil and Ground Water Assessment prepared <br /> by Kleinfelder and Associates, and the 13 July 1988 Feasibility Study/Remedial <br /> Action Plan and 17 February 1989 Ground Water Monitoring Report prepared by <br /> Dames & Moore Consultants for this site. <br /> These reports address soil contamination resulting from discharges from a <br />' leaking underground diesel tank formerly located at the west end of the <br /> maintenance shop building. The reports include a conceptual plan for <br /> excavation and on-site treatment of the contaminated soil . We agree with the <br /> concept of excavation and on-site treatment. However, because it does not <br /> appear feasible to excavate all the contaminated soil , an important component <br /> of the remedial action plan will be a long-term ground water monitoring <br /> program. <br />' The existing ground water monitoring system consists of three monitoring wells <br /> installed By Kleinfelder and Associates during the 1987 investigation. These <br /> wells were sampled in July 1987 (kleinfelder) , and June 1988 (Dames & Moore) <br /> A third round of sampling was attempted in January 1989. However, at that <br /> time, two of the wells were dry and the third contained only two feet of <br />' water. <br /> Although hydrocarbons were not detected in ground water during these <br /> investigations, we do not believe that this data is sufficient to verify that <br /> ground water has not been impacted by discharges of hydrocarbons at this site <br /> --- - Based on our review of the available information, the -exisi:ing-m iu ring <br /> wells are not located close enough to the underground storage tank to provide <br /> adequate detection of hydrocarbons which may have reached grotird water, In <br /> addition, the existing ground water monitoring system does not appear capable <br /> of detecting pollutants which may have leaked from the piping system <br /> connecting the fuel tank to the pump island. This piping system (greater than <br /> 120 feet) is considered to be part of the underground storage tank, and, <br /> therefore, must be included in the monitoring program. <br /> 1 <br />