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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 /> SEP 2 21999 <br /> 20 September 1989 ENVI <br /> PERAWITIC VICES TH <br /> Mr. James C. Wang <br /> Diamond Properties, Inc. <br /> 2546 Derby Drive <br /> San Ramon, CA 94583 <br /> DIAMOND PROPERTIES SITE, 825 WEST 11TH STREET, TRACY, SITE INVESTIGATION <br /> REPORT <br /> We have reviewed the 11 January 1989 "Report of Site Investigation" prepared <br /> by your consultant Brown & Caldwell Consulting Engineers for this site. The <br /> investigation included the drilling and sampling of six soil borings and the <br /> installation and sampling of ground water monitoring wells in three of the <br /> boreholes. Hydrocarbon contamination was detected in soil and ground water <br /> on-site. <br /> We agree with the consultant's conclusions that the extent of soil and ground <br /> water contamination have not yet been adequately defined. Therefore, we <br /> request that you submit a work plan for additional investigation to identify <br /> the extent of hydrocarbon contamination in soil and ground water. <br /> Please submit the requested work plan by 20 October 1989. I have enclosed a <br /> copy of our Tri-Regional Board Recommendations and Appendix A, the Reporting <br /> Requirements for your use. If you have any questions, please call me at (916) <br /> 361-5731. <br /> THOMAS D. PELTIER <br /> Engineering Geologist <br /> TDP/tdp <br /> Enclosures <br /> cc:vEleanor Ratliff, San Joaquin County Department of Public Health Services, <br /> Stockton <br />