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Case Narrative C <br /> Client:Antea USA, Inc. TestAmerica Job ID: 720-56810-1 <br /> Project/Site: UPRR-Stockton <br /> Job ID: 720-56810-1 (Continued) <br /> Laboratory:TestAmerica Pleasanton(Continued) <br /> GC Semi VOA <br /> Method 8081A:The%RPD between the primary and confirmation column/detector exceeded 40%for DDT,alpha-chlordane for the <br /> following sample(s): B-7D1.5(720-56810-14). The lower value has been reported and qualified in accordance with the laboratory's SOP. <br /> Method 8082:Surrogate recovery for the following sample was outside control limits: (720-56810-23 MS),B-2D5.5(720-56810-3), <br /> B-3D5.5(720-56810-4), B-7D1.5(720-56810-14), B-8D1.5(720-56810-16). Evidence of matrix interference is present;therefore, <br /> re-extraction and/or re-analysis was not performed. <br /> Method 8082:The following sample appears to contain polychlorinated biphenyls(PCBs);however,due to weathering or other <br /> environmental processes,the PCBs in the sample do not closely match any of the laboratory's Aroclor standards used for instrument <br /> calibration:B-17D1.5(720-56810-21). The sample(s)has been quantified and reported as Aroclor 1260. Due to the poor match with the <br /> Aroclor standard(s),there is increased qualitative and quantitative uncertainty associated with this result. <br /> No other analytical or quality issues were noted. <br /> Metals <br /> Method 601OB:The matrix spike/matrix spike duplicate(MS/MSD)recoveries for prep batch 157814 were outside control limits. Sample <br /> matrix interference and/or non-homogeneity are suspected because the associated laboratory control sample(LCS)recovery was within <br /> acceptance limits. <br /> Method 601OB:The matrix spike/matrix spike duplicate(MS/MSD)recoveries for prep batch 157670 were outside control limits. Sample <br /> matrix interference and/or non-homogeneity are suspected because the associated laboratory control sample(LCS)recovery was within <br /> acceptance limits. <br /> Method 6010B:The serial dilution performed for the following sample associated with prep batch 157670 was outside control limits: <br /> (720-56810-13 SD) <br /> Method 601OB:The matrix spike/matrix spike duplicate(MS/MSD)recoveries for prep batch 157811 were outside control limits. Sample <br /> matrix interference and/or non-homogeneity are suspected because the associated laboratory control sample(LCS)recovery was within <br /> acceptance limits. <br /> Method 6010B:The serial dilution performed for the following sample associated with analytical batch 157955 was outside control limits: <br /> (720-56810-20 SD) <br /> Method 601OB:The continuing calibration verification(CCV)associated with prep batch157811 recovered above the upper control limit for <br /> Cd. The samples associated with this CCV were non-detects for the affected analytes;therefore,the data have been reported. The <br /> following samples are impacted:B-20D3.5(720-56810-29),B-21D1.5(720-56810-30), B-23D5.5(720-56810-34), B-24D2.5 <br /> (720-56810-33), B-25D1.5(720-56810-35),B-25D5.5(720-56810-36),B-26D3.5(720-56810-37),B-27D1.5(720-56810-38). <br /> Method 601OB:The following sample was diluted due to the abundance of non-target analyte Al and Fe:B-18D6.5(720-56810-24), <br /> B-19D3.5(720-56810-27), B-21 D3.5(720-56810-31), B-25D1.5(720-56810-35). Elevated reporting limits(RLs)are provided. <br /> Method 601OB: Due to sample matrix effect on the internal standard(ISTD),a dilution was required for the following sample:B-18D6.5 <br /> (720-56810-24), B-19D3.5(720-56810-27). <br /> Method 601OB:The following sample was diluted due to the abundance of non-target analyte:B-21 D1.5(720-56810-30). Elevated <br /> reporting limits(RLs)are provided. <br /> No other analytical or quality issues were noted. <br /> Organic Prep <br /> No analytical or quality issues were noted,other than those described in the Definitions/Glossary page. <br /> TestAmerica Pleasanton <br /> Page 5 of 241 4/29/2014 <br />