ARCHIVED REPORTS_SITE STATUS REPORT 2009 2ND QUARTER

Home Browse Search

Nestle USA, Inc., Ripon, California August 11, 2009 Second Quarter 2009 Site Status Report oo The On-Site treatment system was 100% operational during the Second quarter of 2009. oo Table 7 summarizes the groundwater extraction and treatment system O&M dates, totalizer readings, and mass removal calculations. oo Appendix C contains copies of the monthly system performance reports. oo ECM collected water samples from the On-Site extraction and treatment system at the combined EU-3 and EU-4 influent, midpoint (after first carbon vessel), midpoint 2 (after second carbon vessel) and effluent ports (Table 6.1) in compliance with the MRP. oo ECM collected water samples from the Off-Site extraction and treatment system at the combined E-2 and E-6 influent and effluent ports (Table 6.1). oo Water samples from the On-Site and Off-Site extraction and treatment systems were analyzed for metals and general minerals per the MRP (Table 6.1). 4 RESULTS AND DISCUSSION OF FIELD ACTIVITIES PERFORMED 4.1 WATER LEVEL MONITORING Groundwater elevation data were used to prepare contour maps of the potentiometric surface for the Upper, Intermediate and Lower (U, I and L) Aquifer zones (see Figure 3, Figure 4 and Figure 5). These contour maps utilized the data collected from monitoring and production wells as discussed in Section 3.1. ECM also used well data that included the shallow monitoring wells installed by the City of Ripon to monitor the municipal wastewater lagoons (`W' wells) and the Neenah Paper Company wells (TH wells) to generate these figures. Analysis of the groundwater elevation figures (Figures 3 through 5) revealed the following observations: oo Groundwater in the Upper and Intermediate aquifers in the northern portion of the Study Area primarily flows north-northwest, except where active pumping wells (i.e. Nestle extraction and treatment system wells and City municipal wells) alter the groundwater elevation. Since 2002, groundwater flow directions in the Upper and Intermediate aquifers have varied from northwesterly to northeasterly. oo Groundwater in the Lower Aquifer appears to flow primarily west-northwest. This flow direction has remained westerly to northwesterly in the second quarter since 2003. oo Increased pumping at municipal well MW-10 and MW-13 in the Second Quarter 2009 is evidenced by a decrease of 71 and 77 feet in the water elevation, respectively, as compared to the First Quarter 2009 (Table 2). Similar water elevation decreases at MW-10, MW-13, and MW-14 were observed in the Third Quarter 2008. Review of City of Ripon's historical production data for these wells confirms that increase pumping during this period caused the decrease in water elevation in these wells. 6