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� STATE OF CALIFORNIA y GEORGE DEIINME3IAN, Governor <br /> CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD— <br /> CENTRAL VALLEY REGION <br /> 3443 ROUTIER ROAD, SUITE A <br /> SACRAMENTO, CA 95827-3098 1OF <br /> 9 October 1990 <br /> Mr. Charles Poole <br /> Dallas Corporation <br /> P.O. Box 809046 <br /> Dallas, TX 75380-9046 <br /> SURFACE IMPOUNDMENT CLOSURE AT THE OVERHEAD/LODI DOOR COMPANY (O/LDC) FACILITY <br /> IN LODI, SAN JOAQUIN COUNTY <br /> We have reviewed your 1 October 1990 report regarding additional soil analysis <br /> results for the surface impoundment excavation at your facility in Lodi and your <br /> request to proceed with backfill operations. The report included results of <br /> samples collected during the Board's 5 September 1990 TPCA annual inspection of <br /> the facility, along with analyses for soluble nickel (using deionized water <br /> extraction) . It also included the results of metals and pH analyses performed <br /> on the proposed backfill material . <br /> A copy our annual inspection report is enclosed for your records. The purpose <br /> of the inspection was to collect samples from two areas in the impoundment to be <br /> analyzed for total and hexavalent chromium. Your recent report, along with the <br /> findings from our inspection, confirm that the levels of nickel and chromium <br /> remaining in the impoundment will not pose a significant threat to ground water <br /> quality after closure. <br /> We concur that the backfill of the surface impoundment excavation should proceed <br /> as described in the approved 30 January 1990 Final Closure Plan. The sample <br /> results of the backfill material obtained from the Allen pit, near Galt, are <br /> acceptable. <br /> If you have any questions, please call Jean McCue at (916) 361-5729. <br /> GREG K. VAUGHN <br /> Senior Engineer, TPCA Unit <br /> JEM:jm <br /> enclosure <br /> cc+encl : Mr. Jim Parsons, State Water Resources Control Board, Sacramento <br /> Ms. Linda Hogg, Toxic Substances Control Division, Department of Health <br /> Services, Sacramento <br /> Mr. Ron Valinoti , San Joaquin County Environmental Health, Stockton <br /> Mr. C. Curtis Carter, Overhead Door Company, Lodi <br /> Mr. John Schweizer, Remediation Services, Inc. , Pleasanton <br />