ARCHIVED REPORTS_2013 ANNUAL REPORT

Home Browse Search

Nestle USA, Inc., Ripon, California March 26, 2014 2013 Annual Report • COC concentrations in well M-20D decreased after the modification of wells TH-8 and TH- 10 in April 2009, and then increased between 2011 and 2013. Continued monitoring is needed to evaluate the relationship between the well modifications to the former Neenah Paper Company wells and COC concentrations in the Lower Aquifer. Municipal Wells • TCE and cis-1,2-DCE were detected in municipal well MW-3 at concentrations below state and federal MCLs in 2013 (Table 6). Bromoform, bromodichloromethane, and dibromochloromethane were detected in wells MW-3, MW-7, MW-10, and MW-18. These compounds are disinfectant byproducts common in municipal wells and are not associated with Nestle's past practices at the Site. • Increasing COC concentration trends in well MW-3 correlate with increased pumping operations between 2007 and 2009. TCE concentrations have remained constant through 2013, but cis-1,2-DCE concentrations have increased slightly (Table 6). Pumping in well MW-3 increased approximately 34% from 2012 to 2013 (Table 2). The figure in Appendix C depicts the TCE and cis-1,2-DCE concentration trends. 3 ONGOING AND PLANNED REMEDIAL ACTION Ongoing remediation of TCE-impacted groundwater continues at the 230 Industrial Avenue location (the IRAP system) pursuant to the approved Interim Remedial Action Plan? for mass removal and migration control prior to implementing the final approved remedial action for the affected Study Area. During 2013, extraction from the Upper Aquifer continued from wells EU-3 (Upper A-zone), EU-4 (Upper A-zone), and EI-1 (Lower A-zone). As part of the overall remediation goals for the site, ECM submitted the 2011 Revised FS, which presented all components of the recommended remedial action and source reduction activities to bring the site to closure. With support of the RWQCB, Nestle will begin planning and implementation of the hydraulic containment and treatment and monitored natural attenuation (MNA) components of the Remedial Action Plan (RAP) concurrent with the preparation of the RAP in 2014 (see Section 6.1). A summary of the on-going and planned remedial actions for the Study Area are described in the subsections below. 3.1 IRAP OPERATION AND MAINTENANCE The current IRAP system uses two in-line 10,000-pound GAC vessels to treat extracted groundwater. In 2013, the IRAP system treated the extracted groundwater and discharged it to the City of Ripon WWTP via the industrial sewer. This system extracted approximately 75.5 MG of groundwater and removed 32.01 pounds of COCs from the Upper Aquifer between December 20, 2012, and December 19, 2013. This rate is equivalent to 0.42 pounds of COCs removed per every million gallons of water extracted from the Upper Aquifer (Table 7). Approximately 13