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Raymond Investment Corporation Page 2 <br /> 730 Channel Street December 9, 2011 <br /> Stockton, California 95202 <br /> Although a significant amount of sorbed TPH-G and TPH D remains at your site, only <br /> groundwater collected from monitoring wells MW-4 and MW-5 appears to be impacted. The <br /> petroleum-hydrocarbon impacted groundwater is delineated laterally by monitoring wells MW-1, <br /> MW-2, MW-3R, MW-6 and MW-7, and vertically by MW-4D. Also, concentrations of <br /> contaminants of concern appear to be stable or declining in groundwater collected from MW-4 <br /> and MW-5. As the CUF will only reimburse for closure-related expenses once the five-year <br /> review unit recommends site closure consideration, the EHD is considering closure of your site. <br /> To this end, the EHD directs that a site closure report be submitted to this department that: <br /> • Provides an estimate when groundwater will return to water quality goals; <br /> • Includes Table 1 - Checklist of Required Data for No Further Action Requests at <br /> Underground Tank Sites (Appendix A — Reports, Tri-regional Board Staff <br /> Recommendations for Preliminary Investigation and Evaluation of Underground Tank <br /> Sites, dated 16 April 2004, published by the California Environmental Protection Agency <br /> Regional Water Quality Control Board Central Valley Region; and <br /> • Addresses the human health risk and hazard posed by the soil gas results reported for <br /> TPH-D detected in soil gas samples SV40, SV4D-duplicate. <br /> The EHD directs that all monitoring and sampling at this site be suspended while the site is <br /> being considered for closure. If you have any questions regarding this letter, please contact <br /> Vicki McCartney at (209) 468-9852, or by email at vrnccartney@sjcehd.com. <br /> Sincerely, <br /> Victoria L. McCartney, REHS Nuel C. Henderson, Jr., PG <br /> Senior Registered Environmental Health Specialist Engineering Geologist <br /> c: Mr. Bill A. Cook Ill, PG, Condor Earth Technologies, Incorporated, 188 Frank West Circle, <br /> Suite 1, Stockton, California 95206 <br /> Mr. James L.L. Barton, PG, California Regional Water Quality Control Board Central Valley <br /> Region, 11020 Sun Center Drive, Suite 200, Rancho Cordova, California 95670 <br /> ti <br /> j <br />