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California Regional Water Quality Control Board <br /> Central Valley Region ,l <br /> ' ar <br /> n� <br /> Linda S.Adams Karl E.Longley,ScD,P.E.,Chair Arnold <br /> S'ecretaryfor <br /> Environmental Sacramento Main Office Schwarcenegger <br /> Protection 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 Govemor <br /> Phone(916)464-3291•FAX(916)464-4645 <br /> http://www.waterboards.ca.gov/centralvalley <br /> 19 November 2007 <br /> Nestl6 USA Inc. <br /> Attention: Mr. Mike Desso <br /> 800 North Brand Boulevard <br /> Glendale, California 91203 <br /> INTERIM REMEDIAL ACTION WORK PLAN FOR 230 INDUSTRIAL AVENUE, FORMER <br /> NESTLE USA, INC., FACILITY, RIPON, SAN JOAQUIN COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Regional Water <br /> Board) staff has reviewed the 18 October 2007 Industrial Avenue Interim Remedial Action <br /> Work Plan (Work Plan). The Work Plan was prepared by Environmental Cost Management, <br /> Inc. (ECM), on behalf of Nestl6 USA, Inc. (Nestl6) for their former coffee decaffeination <br /> facility located at 230 Industrial Avenue, Ripon, California (Former Facility). Nestl6 <br /> submitted the Work Plan to comply with Required Action No. 14 of Cleanup and Abatement <br /> Order No. R5-2006-0720, which was issued by the Regional Water Board on 24 July 2006. <br /> Interim Remedial Action Plan <br /> On 13 August 2007, Nestld submitted the 10 August 2007 Interim Remedial Action Plan <br /> (IRAP). Regional Water Board staff conditionally approved the ]RAP in a review letter dated <br /> 19 September 2007. The Work Plan details activities necessary to implement the IRAP. <br /> The IRAP evaluated remediation alternatives for groundwater impacted by volatile organic <br /> compounds (VOCs) released from the Former Facility. The VOCs, primarily trichloroethene <br /> (TCE), were identified beneath the Former Facility during cone penetrometer test <br /> investigation work performed in 2005 and reported in Geomatrix Consultants, Inc.'s <br /> (Geomatrix) 6 April 2006 Initial Testing and Characterization Report, In Situ Groundwater <br /> Remediation Program. Geomatrix identified concentrations of TCE up to 7,800 micro grams <br /> per liter (µg/L) in groundwater within two sand layers beneath the Former Facility. The IRAP <br /> documented field investigations that ECM conducted to determine if the source of the VOCs <br /> was within two clay layers immediately above the impacted sand layers, and within vadose <br /> zone soils between the ground surface and the water table. Also, the field investigation <br /> further characterized the lateral extent of the dissolved VOCs in groundwater within both <br /> sand layers. Based on the results of the investigation, ECM showed that the VOCs were <br /> primarily dissolved in groundwater within the saturated sand layers and not within the <br /> overlying saturated clay layers or the vadose zone. Apparently, the sand layer with the <br /> highest concentrations (up to 7,800 µg/L) and largest lateral extent of dissolved TCE occurs <br /> between approximately 50 and 65 to 70 feet beneath ground surface (bgs). The other sand <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />