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Case Narrative <br /> Client: Specialized Contracting Services Inc Job ID: 720-93292-1 <br /> Project/Site: Irby Ranch Stockpile <br /> Job ID: 720-93292-1 <br /> Laboratory: Eurofins TestAmerica, Pleasanton <br /> Narrative <br /> Job Narrative <br /> 720-93292-1 <br /> Comments <br /> No additional comments. <br /> Receipt <br /> The samples were received on 6/3/2019 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 3.9°C. <br /> GC/MS VOA <br /> Method(s)8260B:The matrix spike/matrix spike duplicate(MS/MSD)recoveries and precision for preparation batch 720-266810 and <br /> analytical batch 720-266793 were outside control limits. Sample matrix interference and/or non-homogeneity are suspected because the <br /> associated laboratory control sample/laboratory sample control duplicate(LCS/LCSD)precision was within acceptance limits. <br /> Method(s)8260B: Internal standard (ISTD)response for the following samples were outside control limits: SP-A(720-93292-1)and <br /> (720-93239-A-4-F). The sample(s)was re-extracted and/or re-analyzed with concurring results, and the second set of data has been <br /> reported. <br /> No additional analytical or quality issues were noted,other than those described above or in the Definitions/Glossary page. <br /> GC/MS Semi VOA <br /> Method(s)8270C SIM:The following samples were diluted due to the abundance of non-target analytes: SP-B (720-93292-2), SP-C <br /> (720-93292-3)and SP-D(720-93292-4). Elevated reporting limits(RLs)are provided. <br /> Method(s)8270C SIM:The matrix spike/matrix spike duplicate(MS/MSD)recoveries for preparation batch 720-266921 and analytical <br /> batch 720-267038 were outside control limits. Sample matrix interference and/or non-homogeneity are suspected because the <br /> associated laboratory control sample(LCS)recovery was within acceptance limits. <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(MS)recoveries for preparation batch 720-266905 and analytical batch 720-267037 were outside <br /> control limits. Sample matrix interference and/or non-homogeneity are suspected because the associated laboratory control sample <br /> (LCS)recovery was within acceptance limits. <br /> Method(s)8082: The following samples required a tetrabutylammonium sulfite(TBA)clean-up to reduce matrix interferences caused by <br /> sulfur: SP-B (720-93292-2), SP-C(720-93292-3), SP-D(720-93292-4), (LCS 720-266906/2-A)and (MB 720-266906/1-A). <br /> Method(s)8082: The matrix spike/matrix spike duplicate(MS/MSD)recoveries and precision for preparation batch 720-266906 and <br /> analytical batch 720-266962 were outside control limits. Sample matrix interference and/or non-homogeneity are suspected because the <br /> associated laboratory control sample(LCS)was within acceptance limits. <br /> Method(s)8082: The following samples required a tetrabutylammonium sulfite(TBA)clean-up to reduce matrix interferences caused by <br /> sulfur: SP-A(720-93292-1), (720-93292-A-1-KMS)and (720-93292-A-1-LMSD). <br /> No additional analytical or quality issues were noted,other than those described above or in the Definitions/Glossary page. <br /> Metals <br /> No analytical or quality issues were noted, other than those described 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 61 6/10/2019 <br />