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4404 Californiotegional Water Quality Ccrol Board <br /> Central Valley Region <br /> Linda S.Adams Karl E. Longley,SCD,P.E.,Chair Arnold <br /> Secretaryfor Schwarzenegger <br /> Environmental Sacramento Main Office Governor <br /> Protection 11020 Sun Center Drive 4200,Rancho CordovaFfo <br /> http://www.wa[erboards.ca.gov/ce t I' a9!5670�-6114 <br /> Phone(913Jr / <br /> C <br /> L� <br /> SEP 2 4 2007 <br /> 19 September 2007 ENVIRCNIV1EN7 HEAL-D4 <br /> PERMIT/SFxyigS <br /> Nestl6 USA Inc. <br /> Attention: Mr. Mike Desso <br /> 800 North Brand Boulevard <br /> Glendale, California 91203 <br /> INTERIM REMEDIAL ACTION PLAN FOR 230 INDUSTRIAL AVENUE, FORMER NESTLE <br /> 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 10 August 2007 Interim Remedial Action Plan for <br /> 230 Industrial Avenue, Former Nestle USA Inc. Facility (I RAP). The IRAP was prepared by <br /> Environmental Cost Management, Inc. (ECM), on behalf of Nestl6 USA, Inc. (Nestle) for their <br /> former coffee decaffeination facility located at 230 Industrial Avenue, Ripon, California <br /> (Former Facility). <br /> The [RAP evaluates 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 in groundwater within two sand layers beneath the Former Facility. The IRAP <br /> documents recent field investigations that ECM conducted to determine if the source of the <br /> G Within ttarc, r lav lnymrc immediately above the impacted sand layers, and within <br /> vadose zone soils between the ground surface and the water table. Also, the field <br /> investigation further characterized the lateral extent of the dissolved VOCs in groundwater <br /> within both sand layers. Based on the results of the investigation, ECM concluded that the <br /> VOCs are primarily dissolved in groundwater within two saturated sand layers below two clay <br /> layer that are between approximately 30 and 35 feet beneath ground surface (bgs), and <br /> 45 and 50 feet bgs. ECM did not find significant concentrations of VOCs in vadose zone <br /> soils, or in saturated zone clay soils. <br /> The primary objective of the IRAP is to stop continued migration of VOCs in shallow <br /> groundwater away from the Former Facility. An additional objective is to reduce the <br /> concentrations of VOCs dissolved in groundwater. Nestl6 presented an evaluation of four <br /> methods to achieve the objectives: <br /> 1. Groundwater extraction and treatment exclusively from upper zone extraction wells. <br /> (Note: The existing treatment system that ECM operates at the Former Facility would be <br /> California Environmental Protection Agency <br /> QV Recycled Paper <br />