ARCHIVED REPORTS - Laserfiche WebLink

Home Browse Search

TABLE 9 ANALYSIS OF CHROMIUM CONCENTRATIONS AND REDUCTION POTENTIAL FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Page 2 of 3 Percent Change m Description of Trend for Ke Indicator Parameters Fourth Quarter 2012 Concentration p � Y Potential for Monitoring Concentration(µ Concentrations fromg/L) has been Further Maximum Oxidation Reduction Recommendation` Well Total Chromium Total Chromium Below 50µg/L Chromium Iron Manganese Total Organic Carbon Potential Chromium Chromium VI Chromium VI Since e Reduction Injection Area Wells(Continued) TW-15 37 36.8 -61% -63%° 1/2009 Possibly increasing, Slightly above WQO Above baseline, Low Positive Low Continue performance monitoring per the MRP below WQO and baseline possibly decreasing TW-16 4J <0.5 -94% NM 1/2009 Stable below WQO Slightly above WQO Above baseline Low Positive Goal achieved Continue performance monitoring per the MRP (4/2008) and baseline I-11 305 303 -40% -40% Exceeds Possibly decreasing Near WQO,slightly Baseline(ND) Low Positive Low Continue performance monitoring per the MRP from high in April 2012 above and baseline Below WQO and Below WQO and Revert to sitewide compliance monitoring MW-1 6 NA -67% -24% Before 2008 Stable below WQO baseline baseline program Low Positive Goal achieved d MW-2 20 19.0 -57% -53% Before 2008 Stable below WQO Below WQO,slightly Baseline(ND) Low Positive Goal achieved Revert to sitewide compliance monitoring above baseline program Above WQO and Increased after 2008 MW-213(I-7) 2,880 2,710 -60% -62% Exceeds Fluctuating baseline and 2010 injections, Low Positive Low Continue performance monitoring per the MRP now decreaseing MW-214(I-8) <10 <0.5 -100% -100% 7/2010 Stable below WQO Below WQO and near Decreasing trend,above Low Positive Goal achieved Revert to sitewide compliance monitoring baseline WQO program Below WQO near Above baseline(ND) Revert to sitewide compliance monitoring MW-320 <10 <0.5 -100% -100% Before 2008 Below WQO baseline but below WQO Low Positive Goal achieved program d Exceeds ° ° (hexavalent Decreasing relative to Near WQO and Increased in fourth MW-321 (I-9) 57 49.5 -93% -95% chromium highs in 2010 baseline Above baseline quarter 2012 Positive Moderate Continue performance monitoring per the MRP slightly below WQO) MW-322 15 14.9 -76% -75% 4/2010 Below WQO Above WQO and Above baseline Low Positive Goal achieved Continue performance monitoring per the MRP baseline Near WQO and Increase in fourth Revert to sitewide compliance monitoring MW-323 <10 6.05 -100% -40% Before 2008 Stable below WQO quarter 2012,above Low Positive Goal achieved d baseline WQO program MW-324(I-10) 16 15.2 -62% -9% Before 2008 Stable below WQO Above WQO and Baseline(ND) Low Positive Goal achieved Continue performance monitoring per the MRP baseline Below WQO and near Near WQO and below Revert to sitewide compliance monitoring MW-361 <10 NA NM NM Before 2008 Stable below WQO Low Positive Goal achieved d baseline baseline program MW-4475 716 700 -91% -91% Exceeds Above WQO, Near WQO Below WQO Low Positive Low Continue performance monitoring per the MRP decreasing trend MW-447D 2,300 2,250 -34% -28% Exceeds Stable above WQO Near WQO and Non-detect Increased in fourth Positive Moderate Continue performance monitoring per the MRP baseline quarter 2012 MW-4485 2,480 2,470 -5% -3% Exceeds Stable above WQO Near WQO and Non-detect Low Positive Low Continue performance monitoring per the MRP baseline MW-448D 2,930 2,860 -77% -77% Exceeds Above WQO, Below WQO and Non-detect Low Positive Low Continue performance monitoring per the MRP decreasing trend baseline MW-449S 1,750 1,720 -35% -34% Exceeds NA NA NA NA NA NA New well with only 2 samples;continue performance monitoring per the MRP MW-449D 6,320 6,610 0% 0% Exceeds NA NA NA NA NA NA New well with only 2 samples;continue performance monitoring per the MRP MW-450S 4,400 4,360 0% 0% Exceeds NA NA NA NA NA NA New well with only 2 samples;continue performance monitoring per the MRP MW-450D 85 85 -15% -3% Exceeds NA NA NA NA NA NA New well with only 2 samples;continue performance monitoring per the MRP Decreased but above Near WQO and Increase in second half EW-3 11,400 12,000 -69% -64% Exceeds WQO baseline of 2012 Low Positive Low Continue performance monitoring per the MRP MW-4 1,050 1,030 0% 0% Exceeds Stable above WQO Slightly above WQO Non-detect Low Positive Low Continue performance monitoring per the MRP