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' STATE OF CALIFORNIA GEORGE DEUKMEJIAN GOVOMOr <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD-- 7 <br /> CENTRAL VALLEY REGION <br /> 43 ROUTIER ROAD <br /> CRAMENTO CA 95827 3098 <br />' 16 February 1990 <br /> FEB 2 0 1ggn <br /> DAMES & t%400RE <br /> Mr Doug Westenhaver <br /> President <br /> American Forest Products Company <br />' 4000 Kruseway Place, <br /> Buildina 2, Suite <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 Klelnfelder and Associates, and the 13 July 1988 Feasibility Study/Remedial <br /> Action Plan and 17 February 1989 Ground Water Monitoring Report Drepared 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 /> r 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 ►'n�;,^,d of sa.m-1 ,ry rias 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 />` <br />{ { ground water has not been impacted by discharges of hydrocarbons at this site <br /> Based on our review of the available information, the existing monitoring <br /> wells are not located close enough to the underground storage tank to provide <br /> adequate detection of hydrocarbons which may have reached ground 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, rust be included in the monitoring program. <br />