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January 29,2011 <br /> Page 2 <br /> ASB-2 was 643 mg/L (January), which is below the 713 mg/L water-quality <br /> protection standard (WQPS) for TDS established for the semiperched aquifer. <br /> • Groundwater chemistry under portions of the site does not meet water-quality <br /> protection limits established for this site, although remediation activities at the site <br /> are ongoing, and groundwater quality is continuing to improve. <br /> Violations Since Last Report <br /> No violations have occurred at the site since the submittal of the previous groundwater- <br /> monitoring report. NP is currently in a corrective action monitoring program per revised <br /> Waste Discharge Requirements (WDR), Order 5-01-148, dated 14 September 2009. <br /> TDS concentrations in the groundwater under portions of the site are above water quality <br /> protection standards (WQPS) established by the California Regional Water Quality <br /> Control Board, Central Valley Region (CVRWQCB) in correspondence dated August 21, <br /> 2006. Corrective actions intended to remedy this situation are discussed below. Table 1 <br /> presents WQPS for the site. <br /> Table 1 <br /> Water Quality Protection Standards <br /> COC Semiperched Upper Intermediate <br /> Aquifer Aquifer Aquifer <br /> Bicarbonate 307 mg/L 482 mg/L 315 mg/L <br /> Calcium 51 mg/L 209 mg/L 49 mg/L <br /> Chloride 178 mg/L 197 mg/L 68 mg/L <br /> Electrical 1242 µmhos/cm 1580 µmhos/cm 760 µmhos/cm <br /> Conductance <br /> Magnesium 26 mg/L 43 mg/L 8.8 mg/L <br /> Nitrate 4.3 mg/L 4.7 mg/L 5.7 m L <br /> pH 6.5-8.5 6.5-8.5 6.5-8.5 <br /> Potassium 2.6 mg/L 10 mg/L 6.8 mg/L <br /> Sodium 184 mg/L 89 mg/L 100 mg/L <br /> Sulfate 111 mg/L 150 mg/L 31 mg/L <br /> TDS 1 713 mg/L 1 1030 mg/L 470 mg/L <br />