Laserfiche WebLink
CalifornieRegional Water Quality Corol Board <br /> Central Valley Region <br /> Robert Schneider, Chair <br /> Linda S.Adams 11020 Sun Center Drive#200,Rancho Cordova,California 956706114 Arnold <br /> Secretaryfor Phone(916)464-3291•FAX(916)4644645 Schwarzenegger <br /> Environmental http://www.waterbouds.ca.gov/centralvalley Governor <br /> Protection <br /> 6 July 2006 RECEIVED <br /> ADMINISTRATION <br /> Nestle USA Inc. JUL 1 0 2006 <br /> 800 North Brand Boulevard <br /> Glendale, California 91203 SAN JOAQUIN COUNTY <br /> Attention: Mr. Mike Desso PUBLIC HEALTH SERVICES <br /> INITIAL TESTING AND CHARACTERIZATION REPORT, IN SITU GROUNDWATER <br /> REMEDIATION PROGRAM, FORMER NESTLE USA, INC. FACILITY, RIPON, <br /> CALIFORNIA <br /> California Regional Water Quality Control Board, Central Valley Region (Regional Water <br /> Board) staff has reviewed the Initial Testing and Characterization Report, In Situ <br /> Groundwater Remediation Program, Former Nestl6 USA, INC. Facility, dated April 2006 <br /> (Report). The Report was prepared by Geomatrix Consultants, Inc. (Geomatrix), on behalf <br /> of Nestle USA, Inc. (Nestl6) for the former facility located at 230 Industrial Avenue, Ripon, <br /> California (Site). <br /> The objectives of the work performed by Geomatrix were to identify an area to implement in <br /> situ bioremediation (ISB) and collect data that would facilitate the development of an ISB <br /> pilot test. The Report documents the installation of cone penetrometer borings, collection of <br /> soil and discrete-depth groundwater samples, chemical analyses of samples for volatile <br /> organic compounds including trichloroethene (TCE), measurement of groundwater velocity, <br /> and testing of carbohydrate injection for TCE remediation in groundwater. The Report <br /> concludes ISB is a feasible technology for the northern portion of the Site and indicates that <br /> a work plan for a pilot-scale system will be submitted to the Regional Water Board. <br /> Review Comments <br /> The Report documents concentrations of TCE in groundwater beneath the Site source area. <br /> Concentrations exceeding 1,000 micrograms per liter (µg/L) were measured in groundwater <br /> samples collected beneath the Site at a more shallow depth interval than is currently <br /> monitored by the well network or pumped by extraction wells. The TCE mass exceeding <br /> 1,000 pg/L appears to be between approximately 30 to 60 feet below ground surface (bgs) <br /> and within the Site property boundary. This mass appears to be a major source of TCE in <br /> the plume identified by ongoing Nestl6 assessment work that is migrating in the Upper, <br /> Intermediate, and Lower Aquifers. <br /> Nestle should utilize the groundwater treatment system currently operating at Industrial <br /> Avenue to control the migration of the TCE mass identified beneath the Site. However, the <br /> California Environmental Protection Agency <br /> Cd Recycled Paper <br />