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Case Narrative <br /> Client: ProTech Consulting and Engineering Job ID: 720-92770-1 <br /> Project/Site: SRVHS Stockpile <br /> Job ID: 720-92770-1 <br /> Laboratory: Eurofins TestAmerica, Pleasanton <br /> Narrative <br /> Job Narrative <br /> 720-92770-1 <br /> Comments <br /> No additional comments. <br /> Receipt <br /> The samples were received on 5/2/2019 9:36 AM;the samples arrived in good condition, properly preserved and,where required,on ice. <br /> The temperature of the cooler at receipt was 3.3°C. <br /> GC/MS VOA <br /> No analytical or quality issues were noted, other than those described in the Definitions/Glossary page. <br /> GC/MS Semi VOA <br /> Method(s)8270C: Surrogate recovery for the following samples were outside control limits: SP-1A,B,C,D (720-92770-5), SP-2A,B,C,D <br /> (720-92770-10), (720-92770-A-5-L MS)and (720-92770-A-5-M MSD). Evidence of matrix interference is present;therefore, re-extraction <br /> and/or re-analysis was not performed. <br /> Method(s)8270C:The matrix spike/matrix spike duplicate(MS/MSD)recoveries for preparation batch 720-264883 and analytical batch <br /> 720-265019 were outside control limits. Sample matrix interference and/or non-homogeneity are suspected because the associated <br /> laboratory control sample(LCS)recovery was within acceptance limits. <br /> Method(s)8270C:The following samples were diluted due to the abundance of non-target analytes: SP-1A,B,C,D(720-92770-5)and <br /> SP-2A,B,C,D(720-92770-10). Elevated reporting limits(RLs)are provided. <br /> No additional analytical or quality issues were noted,other than those described above or in the Definitions/Glossary page. <br /> GC Semi VOA <br /> Method(s)8081A:The matrix spike duplicate(MSD)recoveries for preparation batch 720-264880 and analytical batch 720-265020 were <br /> outside control limits. Non-homogeneity is suspected because the associated laboratory control sample(LCS)recovery was within <br /> acceptance limits. <br /> Method(s)8081A:The%RPD between the primary and confirmation column exceeded 40%for cis-Chlordane for the following samples: <br /> SP-1A,B,C,D(720-92770-5)and SP-2A,B,C,D(720-92770-10). The lower value(s)has been reported and qualified in accordance with the <br /> laboratory's SOP. <br /> Method(s)8082: The following samples required a tetrabutylammonium sulfite(TBA)clean-up to reduce matrix interferences caused by <br /> sulfur: SP-1A,B,C,D(720-92770-5), SP-2A,B,C,D(720-92770-10), (720-92770-A-5-J MS)and (720-92770-A-5-K MSD). <br /> No additional analytical or quality issues were noted,other than those described above or in the Definitions/Glossary page. <br /> Metals <br /> Method(s)6010B:The continuing calibration blank(CCB)for analytical batch 720-265051 contained Lead above the reporting limit(RL). <br /> All reported samples associated with this CCB were either ND for this analyte or contained this analyte at a concentration greater than 10X <br /> the value found in the CCB;therefore, re-analysis of samples was not performed. <br /> No additional analytical or quality issues were noted,other than those described above or in the Definitions/Glossary page. <br /> Organic Prep <br /> No analytical or quality issues were noted, other than those described in the Definitions/Glossary page. <br /> Eurofins TestAmerica, Pleasanton <br /> Page 4 of 46 5/6/2019 <br />