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Californfti egional Water Quality Cool Board <br /> Central Valley Region ro <br /> Linda S.Adams Karl E. Longley,Sent,P.E.,Chair 9nn7 us Arnold <br /> Secreraryjor r ' 7 s ftq rze,rtrger <br /> Enwronmenral Sacramento Main Office ^rib *d <br /> Protection 11020 Sun Center Drive#200,Rancho Cordova,California 95670-6114 S A,4 ��4�^ <br /> Phone(916)464-3291 •F (916)464-465 A1,TfPik <br /> r',4l4 t <br /> hop://www.waterboards ca. ov/centralvalle <br /> dtrHTAL <br /> p Tr'is,Fi:i <br /> 14 May 2007 <br /> Nestle USA Inc. <br /> Attention: Mr. Mike Desso <br /> 800 North Brand Boulevard <br /> Glendale, California 91203 <br /> INTERIM REMEDIAL INVESTIGATION WORK PLAN, FORMER NESTLE USA, INC. <br /> FACILITY, RIPON, SAN JOAQUIN COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Regional Water Board) <br /> staff has reviewed the 23 April 2007 Industrial Avenue Facility Interim Remedial Investigation <br /> Work Plan, Former Nest16 USA Inc. Facility (Work Plan). The Work Plan was prepared by <br /> Environmental Cost Management, Inc., on behalf of Nestle USA, Inc. (Nestle) for their former <br /> coffee decaffeination facility located at 230 Industrial Avenue, Ripon, California (Former Facility). <br /> The purpose of the Work Plan is to further characterize the concentrations of trichloroethene <br /> (TCE) in groundwater identified beneath the Former Facility during cone penetrometer test (CPT) <br /> investigation work performed in 2005 and reported in Geomatrix Consultants, Inc.'s <br /> 6 April 2006 Initial Testing and Characterization Report, In Situ Groundwater Remediation <br /> Program. TCE was detected at concentrations up to 7,800 micrograms per liter in groundwater <br /> samples collected during that investigation. The highest concentrations were detected in the <br /> upper part of a sandy layer near its contact with an overlying clay layer. The contact was <br /> identified at approximately 50 feet below ground surface (bgs). Concentrations of TCE in most of <br /> the groundwater samples collected from deeper within the same sandy layer were an order of <br /> magnitude lower than concentrations in the samples collected near the contact. Nestle intends to <br /> determine if the high concentrations at the contact are the result of relatively slow downward <br /> movement of TCE out of the clay layer soil into the underlying groundwater within the sandy <br /> layer. Reportedly, the clay layer was previously impacted by the saturated, overlying sandy <br /> material, which contained elevated concentrations of TCE; the polluted groundwater may have <br /> migrated from the Former Facility processing areas located a few hundred feet to the south. <br /> With time, the TCE concentrations in the sandy layer groundwater may have been reduced, <br /> possibly as a result of past soil vapor and groundwater extraction activities conducted by Nestle. <br /> However, these activities may have been less effective at removing TCE from the low <br /> permeability clay layer. <br /> The Work Plan is divided into two phases. During Phase 1, Nestle will advance four continuous- <br /> core push-borings for collection of soil samples and three for collection of hydro-punch <br /> groundwater samples. The locations of the proposed borings are shown on the attached <br /> Figure 4 from the Work Plan. Each boring will be pushed to approximately 60 feet bgs. Data <br /> collected during Phase 1 will be evaluated before Phase 2 work begins. If the results of Phase 1 <br /> California Environmental Protection Agency <br /> Q* Recycled Paper <br />