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California legional Water Quality Conlel Board <br /> l \- Central Valley Region <br /> vRobert Schneider,Chair <br /> Linda S. Adams Arnold <br /> Sc,,e•ari.for Sacramento Main office Schwarzenegger <br /> I,,, o.....emol 11020 Sun Center Drive#200, Rancho Cordova,Cal ifomie 956710-6114 . Governor <br /> l' of", o" Phone(916)464-3291 •FAX(916)4644645 I� �y <br /> (` <br /> hop://www.x,aterboards,ca.gov/cenlralvalley 11 ll EC 6EEED <br /> 14 September 2006 <br /> SEP 1 S 20 2006 <br /> ENVIRONMENT HEALTH <br /> Mr. Marshall Cloud PERMIT/SEWCES <br /> Defense Logistics Agency <br /> Defense Distribution Depot San Joaquin CA (DDJC), Sharpe Site <br /> DDJC-FA, Attn: Environmental, Building 100, Room 2 <br /> 25600 Chrisman Road <br /> Tracy, CA 95376-5000 <br /> COMMENTS ON DRAFT DDJC-SHARPE REMEDIAL ACTION WORK PLAN, SITE S-26 <br /> AREA 6, DEFENSE DISTRIBUTION DEPOT SAN JOAQUIN (DDJC), SAN JOAQUIN <br /> COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Regional Water <br /> Board; staff has reviewed the Draft DDJC-Sharpe Remedial Action Work Plan, Site S-26 <br /> Area 6 (Draft Work Plan), dated 4 August 2006 and received on 6 August 2006. The Draft <br /> Work Plan, prepared by URS Group Inc. (URS), presents the details for removal of soil and <br /> railroad ballast contaminated with lead and chromium at Site S-26, Area 6 at the DDJC — <br /> Sharpe site. <br /> The Draft Work Plan presents the activities necessary to remove approximately 90 cubic <br /> yards of contaminated material within 2 feet of the surface. The cleanup levels established <br /> in the "ebruary 1996 Operable Unit 2 Record of Decision (ROD) and revised during the <br /> November 2005 Remedial Project Managers Meeting are 800 milligrams per kilogram <br /> (mg/kg) for total lead and 300 mg/kg for total chromium. The ROD had established the <br /> levels at 1,000 mg/kg and 300 mg/kg, respectively. Also, the Draft Work Plan outlines the <br /> procedures for documenting the concentrations of soluble metals that will remain in place <br /> after completion of the removal action. In addition, the Draft Work Plan outlines the <br /> procedures that will be used to characterize the excavated material which will be transported <br /> to either the Class I Kettleman Hills disposal facility operated by Chemical Waste <br /> Management, or the Class II Forward Landfill near Manteca operated by Forward Inc. <br /> Comments: <br /> Regional Water Board staff has the following comments. <br /> 1. The Draft Work Plan proposes the collection of one soil sample from every 100 linear <br /> feet of each excavation sidewall. Regional Water Board staff believes that a soil sample <br /> should be collected from every 30 linear feet of each excavation sidewall. This would be <br /> California Environmental Protection Agency <br /> p�� Recycled Paper <br />