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TABLE <br /> LABORATORY ANALYTICAL RESULTS <br /> FORMER MARLEY COOLING TOWER SITE <br /> STOCKTON,CALIFORNIA <br /> Page 24 of 24 <br /> LaboratoryAnai ses <br /> Screened Hexavalent <br /> Water-bearing Nitrate as N Calcium Chromium Chromium Manganese <br /> Well zone Sample Date Event/pu! ose mg/L* Sulfate mg/L) mg1L Arsenic pg/L) (pg/L g1L)** Iron pg/L) (pg/L) TD5 mg/[_) TOC mg/L <br /> Water Quality Objective 10 250 j -- 10 50 50 300 50 450 <br /> Quality Control Samples Continued <br /> Field Blank(Continued) 7/18/2012 3rd Qtr. NA 0.3J NA <5 <10 <0.5 <50 <10 6.01 0.2J <br /> 7/1912012 3rd Qtr. NA <i NA <5 <10 <0.5 <50 <10 6.03 0.2J <br /> 7/23/2012 3rd Qtr. NA <1 NA <5 <10 <0.5 <50 <10 7.OJ OAJ <br /> 7/24/2012 3rd Qtr. NA 0.31 ' NA <5 <10 <0.5 <50 <to 6.0J 0,4J <br /> 7/25/2012 3rd Qtr. NA <1 NA <5 <10 <0.5 <50 <10 7.OJ 0.91 <br /> 1012212012 4th Qtr. NA 4.6 NA <5 <10<0.5 <0.5 <50 <10 33.0 1.3 <br /> 10/23/2012 4th Qtr. NA <1 NA <5 <10 <0.5 <50 <10 <16 0.2J <br /> 10/24/2012 4th Qtr. NA <1 NA <5 <10 <0.5 <50 <10 <10 0.51 <br /> 10/25/2012 4th Qtr. NA <1 NA <5 <10 <0.5 <50 <10 <10 0.7J <br /> 10/29/2012 4th Qtr. NA <1 NA <5 <10 <0,5 <50 <10 <10 OAJ <br /> 1/24/2013 1st Qtr. NA <1 NA <5 <10 <0.5 <50 <10 <10 0.1J <br /> 1/25/2013 1st Qtr. NA <i NA <5 <10 <0.5 <50 <io <10 0.31 <br /> 1/29/2013 1st Qtr. NA <1 NA <5 <i0 <0.5 <50 <10 <10 0.51 <br /> 1/30/2013 1st Qtr. NA <i NA <5 <10 <0.5 <50 <10 <10 0.1J <br /> 4/10/2013 2nd Qtr. UNA <1 NA <5 <10 <0.5 <50 <10 <10 0.31 <br /> 4/11/2013 2nd Qtr. <1 NA <5 <10 <0.5 <50 <10 <104/12/2013 2nd Qtr. <1 NA <5 <10 <0.5 <50 <10 <10 0.4J4/16/2013 2nd Qtr. <1 NA <5 <10 <0.5 <50 <10 <10 <1.0 <br /> Motes: <br /> BOLD values exceed Water Quality Objective <br /> Background/Compliance values represent conditions outside the current established chromium plume boundary,and areas of anticipated treatment. <br /> Baseline values represent conditions within and around the current established plume boundary,and areas of anticipated Ir atment,before treatment. <br /> Quarterly wells were established for the program to track treatment performance by quarter(typically sampled In January,A ril,July,and October). <br /> * Nitrate concentrations were reported as NO3 and converted to N by multiplying NO3 concentrations by 0.226(ratio of mol cular weight of nitrogen[14]to nitrate[62]). <br /> **The Water Quality Objective for the Hexavalent Chromium will use the same guidelines as the Chromium column for refeence purposes only. <br /> }tg1L-microgram per liter <br /> J-result Is estimated h <br /> mg/l_-milligram per liter <br /> NA-not analyzed <br /> TDS-total dissolved solids <br /> TOC-total organic carbon <br /> UJ-non-detect value is estimated <br /> 3 <br /> z <br /> JA <br /> i <br /> 3 4� <br /> It. <br /> ii <br /> I - <br /> it <br /> I <br /> s <br />