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Californilklegional Water Quality Conol Board <br /> Central Valley Region <br /> Robert Schneider,Chair <br /> Linda S.Adams Arnold <br /> Secreran: or Sacramento Main Office <br /> 'r11020 Sun Center Drive#200.Rancho Cordova.California 95670-6114 Schwaaeneggier <br /> F.nvironmrnral Protectionr-� Gmernor <br /> Phone httpB(916)464-3291 rboard FAX a (916)464-4645 0 ❑EVE�t� gpD <br /> http//www.waterboardscagov/ceniralvalley �u�-+u� L}� VI(i} <br /> 4 December 2006 DEC 0 0 2006 <br /> Mr. Mike Desso ENVIRONMENT HEALTH <br /> Nestle USA, Inc. PERMITJSERVICES <br /> 800 North Brand Boulevard <br /> Glendale, California 91203 <br /> DRAFT SOIL GAS INVESTIGATION REPORT, INDOOR AIR SAMPLE WORK PLAN <br /> ADDENDUM; FORMER NESTLE USA, INC.; SAN JOAQUIN COUNTY <br /> California Regional Water Quality Control Board, Central Valley Region (Regional Water Board) <br /> staff has reviewed the Draft Soil Gas Survey Report (Draft Report) and the Indoor Air Sample <br /> Work Plan Addendum (Work Plan), dated October 11, 2006. The documents were prepared by <br /> Environmental Cost Management, Inc., on behalf of Nestle USA, Inc. (Nestle) for the former Nestle <br /> facility located at 230 Industrial Avenue, Ripon (Former Facility). The Work Plan is presented in <br /> Addendum A of the Draft Report. <br /> The Draft Report presents the results of soil gas sampling and analyses in the vicinity of the <br /> Former Facility and in the vicinity of a possible secondary source area near 519 South Stockton <br /> Avenue. The purpose of the investigation was to evaluate the extent to which volatile organic <br /> compounds (VOCs) released into groundwater from the Former Facility or from a leaking sewer <br /> line in South Stockton Avenue downstream of the Former Facility, have migrated in soil vapor. <br /> Also, the purpose was to evaluate the potential that VOCs in soil vapor have migrated into nearby <br /> building structures. Concentrations of VOCs in soil vapor samples collected from borings located <br /> adjacent to nearby buildings were compared to published California Human Health Screening <br /> Level (CHHSL) concentrations for residences and commercial/industrial buildings. <br /> General Comments on the Draft Report <br /> The following general comments address the Regional Water Board staff concern that <br /> trichloroethylene (TCE) migration in soil vapor presents potential risk to human health at locations <br /> west and southwest of the Former Facility. Additional soil vapor characterization work is <br /> necessary. Nestle should collect sufficient data for preparation of a human health risk <br /> assessment. The level of risk to residents and workers occupying buildings in these areas must <br /> be determined. <br /> 1. Concentrations of TCE detected in soil vapor samples from both the Industrial Avenue and <br /> Stockton Avenue locations were above residential and/or commercial/industrial CHHSLs. <br /> Although the CHHSLs for TCE may not have been exceeded in the 5-foot soil vapor samples <br /> from some of the borings, the fact that they were exceeded in 10, 15, and/or 20-foot bgs <br /> samples from many of the borings is of concern to the Regional Water Board staff. <br /> California Environmental Protection Agency <br /> 0 Recycled Paper <br />