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TABLE 5 LABORATORY ANALYTICAL RESULTS 2011 ANNUAL GROUNDWATER MONITORING REPORT FORMER MARLEY COOLING TOWER SITE STOCKTON,CALIFORNIA Laboratory Analyses Screened Hexavalent Water-bearing Nitrate as N Calcium Chromium Chromium Manganese Well Zone Sample Date Event/Purpose (mg/L)* Sulfate (mg/L) (mg/L) Arsenic (pg/L) (pg/L) (pg/L)** Iron (pg/L) (pg/L) TDS (mg/L) TOC (mg/L) Water Quality Objective 10 250 -- 10 50 50 300 50 450 -- Quality Control Samples Continued Field Blank (Continued) 1/8/2009 1st Qtr. <1 6.0 NA <5 <10 <10 <100 <10 25 <1.0 1/9/2009 1st Qtr. <1 <1 NA <5 <10 <10 <100 <10 <10 <1.0 1/12/2009 1st Qtr. <1 <1 NA <5 <10 <10 <100 <10 <10 <1.0 4/7/2009 2nd Qtr. <1 <1 NA <5 <10 <10 <50 <10 28 1.8 4/8/2009 2nd Qtr. <1 <1 NA <5 <10 <10 <50 <10 <10 1.5 7/14/2009 3rd Qtr. NA <1 NA <5 <10 <10 <50 <10 13 1.7 7/15/2009 3rd Qtr. NA 1.1 NA <5 <10 <10 <50 <10 12 3.2 10/14/2009 4th Qtr. NA 5.8 NA 2 5 <10 759 20 16 1.6 2/2/2010 1st Qtr. NA <1 NA <5 <10 <10 <50 <10 14 0.3 2/3/2010 1st Qtr. NA 3.5 NA <5 <10 <10 <50 <10 8 0.3 2/1/2010 1st Qtr. NA 2.2 NA <5 <10 <10 <50 <10 <10 0.3 4/13/2010 2nd Qtr. NA <1 NA <5 <10 <10UJ <50 <10 42 0.4 4/14/2010 2nd Qtr. NA <1 NA <5 <10 <10 <50 <10 8 0.2 4/15/2010 2nd Qtr. NA <1 NA <5 <10 <10 <50 <10 27J 0.2 7/7/2010 3rd Qtr. NA <1 NA <5 <10 <10 <50 <10 <10 0.5J 7/8/2010 3rd Qtr. NA <1 NA <5 <10 <10 <50 <10 <10 0.2J 8/16/2010 3rd Qtr. NA 5.62 NA <5 <10 <10 <50 NA <10 <1.0 8/23/2010 3rd Qtr. NA 1.10 NA <5 <10 <10 <50 NA 29 0.7J 10/12/2010 4th Qtr. NA 1.3 NA <5 <10 <10 <50 <10 21 0.5J 10/13/2010 4th Qtr. NA 6.3 NA <5 <10 <10 <50 <10 15 0.8J 10/14/2010 4th Qtr. NA 1.2 NA <5 <10 <10 <50 <10 <10 0.2J 12/6/2010 4th Qtr. NA <1 NA <5 <10 <10 <50 <10 <10 0.3J 12/8/2010 4th Qtr. NA <1 NA <5 <10 <10 <50 <10 <10 0AJ 1/20/2011 1st Qtr. NA 2.9J NA <5 <10 0.2UJ <50 <10 7.OJ 0.08J 1/21/2011 1st Qtr. NA 0.3J NA <5 <10 0.2UJ <50 <10 <10 0.1J 1/25/2011 1st Qtr. NA 1.8 NA <5 <10 <0.2 <50 <10 <10 0.2J 4/13/2011 2nd Qtr. NA <1 NA <5 <10 <0.2 <50 <10 <10 <1.0 4/14/2011 2nd Qtr. NA <1 NA <5 <10 <0.2 <50 <10 <10 <1.0 4/18/2011 2nd Qtr. NA 1.6 NA <5 <10 <0.2 <50 <10 <10 <1.0 5/23/2011 Supplemental NA NA NA NA <10 <0.2 <50 <10 NA 1.0 6/20/2011 Supplemental NA NA NA NA <10 <0.2 <50 <10 NA 0.5J 7/19/2011 3rd Qtr. NA OAJ NA <5 <10 <10 <50 <10 <5 0.3J 7/20/2011 3rd Qtr. NA 1.2 NA <5 <10 <10 <50 <10 7.OJ 0.91 7/21/2011 3rd Qtr. NA 0.3J NA <5 <10 <10 <50 <10 <10 0.1J 8/22/2011 Supplemental NA NA NA NA <10 <0.2 <50 <10 <10 0.91 10/12/2011 4th Qtr. NA <1 NA <5 <10 <0.5 <50 <10 <10 0.2J 10/13/2011 4th Qtr. NA <1 NA <5 <10 <0.5 <50 <10 <10 0.7J 10/17/2011 4th Qtr. NA <1 NA <5 <10 <0.5 <50 <10 <10 0.2J Notes: BOLD values exceed Water Quality Objective Background/Compliance values represent conditions outside the current established chromium plume boundary, and areas of anticipated treatment. Baseline values represent conditions within and around the current established plume boundary, and areas of anticipated treatment, before treatment. Quarterly wells were established for the program to track treatment performance by quarter (typically sampled in January, April, July, and October). * Nitrate concentrations were reported as NO3 and converted to N by multiplying NO3 concentrations by 0.226 (ratio of molecular weight of nitrogen [14] to nitrate [62]). **The Water Quality Objective for the Hexavalent Chromium will use the same guidelines as the Chromium column for reference purposes only. pg/L - microgram per liter J - result is estimated mg/L- milligram per liter NA- not analyzed TDS -total dissolved solids TOC -total organic carbon UJ - non-detect value is estimated (Page 19 of 19)