ARCHIVED REPORTS_SECOND HALF AND ANNUAL 2010 GW MONITORING RPT

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Diamond Per Food Processors of Ripon California LLC January 28, 2011 Combined Annual and Second-Half 2010 Groundwater Monitoring Report. Page 1 of 8 Introduction This report presents the combined annual summary report and the results of second-half 2010 groundwater monitoring performed by Lawrence &Associates (L&A) between July 19 and October 14, 2010, at Diamond Pet Food Processors of Ripon California LLC (DP), 942 South Stockton Avenue, Ripon, California (formerly Neenah Paper FR LLC; Figure 1). The work described in this report fulfills the monitoring and reporting requirements set forth in Waste Discharge Requirements, Order 5-01-148, dated 14 June 2001, issued Neenah Paper FR LLC by the California Regional Water Quality Control Board, Central Valley Region (CVRWQCB) as well as the site's revised monitoring and reporting program (MRP) dated September 14, 2009, for Waste Discharge Requirements, Order 5-01-148. In October 2010, DP purchased the site from Neenah Paper FR LLC and assumed all monitoring and reporting responsibilities per the MRP. Figure 2 shows all monitoring well locations. Table 1 (following text) presents well descriptions including well names, casing diameter, reference point elevation, total depth, screened intervals, and aquifer unit (s). Compliance Record During 2010, the DP site was in compliance with all the monitoring and reporting requirements and effluent discharge limitations set forth in WDR Order 5-01-148. During the past year, DP was still accepting, diluting, and disposing the brine stream from the adjacent Fort Chicago US Power Inc., cogeneration plant (Cogen). The Cogen produces approximately 300,000 gallons of regeneration brine per day with an average total dissolved solid (TDS) concentration of 1,000 mg/L. Cogen brine is discharged to DP's clarifier where it is mixed with lower TDS water from production wells PW-6 through PW-8 before being discharged, in sequence, into aeration stabilization basins ASB-1 and ASB-2, and then pumped to irrigation and percolation fields around the site for disposal. The maximum average monthly TDS concentration measured in discharge from ASB-2 was 643 mg/L (January), which is below the 713 mg/L water-quality protection standard (WQPS) for TDS established for the semiperched aquifer(Attachment C). Groundwater chemistry under portions of the site does not meet water-quality protection limits established for this site, although remediation activities at the site are ongoing, and groundwater quality is continuing to improve. 10107.01 Task 2 Lawrence&Associates K ICLIENTSI Diamond Pei Foods1010107.01-Groundwater MonitoringlGroundumter Nloniioringi201012nd Half 20101annual-2nd Ha1j2010 reporl.doe