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� Y <br /> California Regional Water Quality Co trol Board <br /> Central Valley Region <br /> Winston H.Hickox <br /> Robert Schneider,Chair DavisGray D <br /> Secretary for Sacramento Main Office Governor <br /> Environmental Internet Address: http://www.swrcb.ca.gov/rwgcb5 <br /> Protection 3443 Routier Road,Suite A,Sacramento,California 95827-3003 <br /> Phone(916)255-3000•FAX(916)255-3015 <br /> INL�C�ED�FD <br /> 17 January 2002 JAN 2 2 2002 <br /> ENVIRON-MENT HEALTH <br /> PERMIT/SERVICES <br /> Mr. Ken Price <br /> Glenn Springs Holdings, Inc <br /> 2480 Fortune Dr., Suite 300 <br /> Lexington, KY 40509 <br /> REVIEW OF CONFIRMATIONAND TREATED SOIL SAMPLES,APPROVAL OF <br /> MW-SB INSTALLATION WORK PLAN, OXYCHEM STOCKTON, SAN JOA Q UIN <br /> COUNTY <br /> Your consultant, Geomatrix Consultants, is excavating contaminated soil from the the OxyChem <br /> site at 1904 West Charter Way in Stockton, treating it with low temperature thermal destruction, <br /> installing a shallow monitoring well to replace one removed prior to excavation, and repairing a <br /> deep conductor cased well within the remediated area. In his 15 January 2002 email <br /> transmission, Mr. Tim Souther of Geomatrix provided me with the results of sidewall and bottom <br /> confirmation samples from the excavation and verification samples from the treated soil. He also <br /> submitted the 9 January 2002 Work Plan to Repair Monitoring Well MW-15 and Replace <br /> Monitoring Well MW-5a. <br /> The excavation sidewall samples on the north, south and east meet the target cleanup levels <br /> (TCLs) specified in Geomatrix' June 2001 Soil Remediation Plan and approved in our 27 June <br /> 2001 letter. The west sidewall does not meet the criteria, and Geomatrix is continuing to <br /> excavate and treat soil along the west side. As Mr. Souther stated, excavation will continue until <br /> confirmation samples of the west wall meet the TCLs. The excavation has removed ontaminants <br /> from the surface to groundwater(eight feet below ground surface). In the western portion of the <br /> base of excavation, 1,2-dichloropropane and dibromochloropropane are still detected at <br /> concentrations above their respective TCLs. Since the excavation base coincides with the <br /> groundwater table and these compounds are found in groundwater, further excavation below the <br /> water table will not provide additional source removal benefits. When the confirmation samples <br /> for the west wall meet or exceed the TCL, the excavation may be backfilled. The analytical <br /> results documenting the level of treatment achieved from the low temperature thermal <br /> destruction show that the treated soil meets the established TCLs and is suitable to be returned to <br /> the excavation. <br /> California Environmental Protection Agency <br /> p�a Recycled Paper <br /> The energy challenge facing California is real. Every Californian needs to take immediate action to reduce energy consumption. For a list of <br /> simple ways you can reduce demand and cut your energy costs,see our Web-site at http://www.swrcb.ca.gov/rwgcb5 <br />