Laserfiche WebLink
California egional Water Quality Con* Board <br /> Central Valley Region <br /> Katherine Hart, Chair <br /> 11020 Sun Center Drive,N200,Rancho Cordova,California 95670-6114 <br /> Matthew Rodriquez (916)464-3291 •FAX(916)464-4645 Edmund C.Brown Jr. <br /> Secretaryfor http://www.waterboards.ca.gov/centmlvalley Governor <br /> Environmental Protection ` , <br /> 31 August 2011 RECE V ED <br /> SEP 0 6 2011 <br /> Nestl6 USA Inc. ENVIRONMENTALHFJILTH <br /> Attention: Mr. Mike Desso PERMITISERVICES <br /> 800 North Brand Boulevard <br /> Glendale, California 91203 <br /> MONITORING WELL M-10A INVESTIGATION RESULTS, AND QUARTERLY <br /> GROUNDWATER SAMPLING RESULTS, FORMER NESTLE USA, INC. FACILITY, <br /> RIPON, SAN JOAQUIN COUNTY <br /> Central Valley Regional Water Quality Control Board (Central Valley Water Board) staff has <br /> reviewed the 30 November 2010 report titled: M-10A Investigation Report (Report) prepared <br /> by Environmental Cost Management, Inc., (ECM), on behalf of Nestl6 USA, Inc. (Nestle). <br /> The purpose of the Report is to present investigation results on the increasing trichloroethene <br /> (TCE) and cis-1,2-dichloroethene (cis-1,2-DCE) concentrations observed in groundwater <br /> samples collected from monitoring well M-10A, located approximately 1,000 feet northwest of <br /> the former Nestle coffee decaffeination facility at 230 Industrial Avenue, Ripon, California <br /> Concentrations of TCE in well M-1 OA began to increase in August of 2005 from approximately <br /> 8 micrograms per liter (Ng/L) to approximately 300 Ng/L in 2010 and 2011. The attached <br /> graph shows the TCE and cis-1,2-DCE concentration trends between January 2004 and <br /> June 2011. <br /> Past operations at the former facility released TCE, cis-1,2-DCE, and other chemicals of <br /> concern (CDCs) into soil and groundwater. In addition to review of the Report, Central Valley <br /> Water Board staff reviewed the 31 March 2011 2010 Annual Report, the 6 May 2011 <br /> First Quarter 2011 Site Status Report, and the 11 August 2011 Second.Quarter 2011 Site <br /> Status Report. These monitoring reports allowed staff to evaluate related COC concentrations <br /> in supply and monitoring wells beyond the Report investigation area. <br /> Background Comments <br /> Nestle conducted the investigation and prepared the Report to comply with required actions <br /> of Cleanup and Abatement Order No. R5-2006-0720 (CAO), issued by the Central Valley <br /> Water Board on 24 July 2006. Required Action Number 10 of the CAO directs Nestle to <br /> monitor guard wells between the source area and City of Ripon (City) supply wells. <br /> Monitoring well M-1 OA and two other wells at this location (M-10B and M-1 OC) have acted as <br /> guard wells for City water supply well MW-4. In July 2009, Nestle and the City <br /> decommissioned MW-4 which was located approximately 420 feet northwest of the <br /> M-10 well nest. Also, two Ripon Unified School District (Ripon USD) water supply wells <br /> (RPS-1 and RPS-2) are located approximately 1,680 feet northwest of the M-10 well nest, <br /> California Environmental Protection Agency <br /> ped Recycled Paper <br />