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Case Narrative <br /> Client: Ghilotti Construction Company Inc Job ID: 720-93317-1 <br /> Project/Site: Hayward 680 Alamo <br /> Job ID: 720-93317-1 <br /> Laboratory: Eurofins TestAmerica, Pleasanton <br /> Narrative <br /> Job Narrative <br /> 720-93317-1 <br /> Comments <br /> No additional comments. <br /> Receipt <br /> The samples were received on 6/4/2019 10:04 AM;the samples arrived in good condition, properly preserved and,where required, on ice. <br /> The temperature of the cooler at receipt was 1.0°C. <br /> GC/MS VOA <br /> Method(s)8260B:The matrix spike/matrix spike duplicate(MS/MSD)recoveries and precision for preparation batch 720-266653 and <br /> analytical batch 720-266845 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: Due to the high concentration of Naphthalene,the matrix spike(MS)for preparation batch 720-266653 and analytical <br /> batch 720-266845 could not be evaluated for accuracy. The associated laboratory control sample(LCS)met acceptance criteria. <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)8081 A:The%RPD between the primary and confirmation column/detector exceeded 40%for trans-Chlordane for the following <br /> sample:#1-3EA(720-93317-1). The lower value(s)has been reported and qualified in accordance with the laboratory's SOP. <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 method blank for preparation batch 720-266989 and analytical batch 720-267098 contained Barium above the <br /> method detection limit. This target analyte concentration was less than the reporting limit(RL);therefore, re-extraction and/or re-analysis <br /> 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 31 6/7/2019 <br />