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ECELCHEM <br /> ENVIRONMENTAL LABS <br /> 500 Giuseppe Court, Suite 9 <br /> Roseville, CA 95678 <br /> Phone#: (916) 773-3664 Fax#: (916) 773-4784 <br /> QA/QC REPORT <br /> i � <br /> Attention: Mr. Noel Lerner Date Analyzed: 12-23-96 <br /> ! Helmick&Lerner, lnc. Matrix: Soil <br /> 1620 Executive Court <br /> Sacramento, CA 95864 <br /> Project: Stockton Unified School District <br /> Ethyl- Total <br /> Benzene Toluene benzene Xylenes <br /> PPM PPM PPM PPM <br /> Reporting Limit: 0.005 0.005 0.005 0.005 <br /> QA/QC PARAMETER <br /> Matrix Blank ND ND ND ND <br /> PERCENT RECOVERIES <br /> Laboratory Control Spike 102% 104% 108% 109% <br /> _i Laboratory Control Spike 93% 94% 99% 1000/0 <br /> Duplicate <br /> ppm=parts per million—mg/Kg=milligram per kilogram <br /> ND =Not detected. Compound(s)may be present at concentrations below the reporting limit. <br /> All surrogate recoveries were within 30%of target values. <br /> Spikes&Spike Duplicates were each spiked with 250 ng BTEX standard. <br /> 71 ANALYTICAL PROCEDURES <br /> BTEX--Benzene,toluene,ethytbenzene,and total xylene isomers(BTEX)are measured by extraction using EPA Method 5030 followed by analysis <br /> 1 using EPA Method 8020 which utilizes a gas chromatograph(GC)equipped with a photoionization detector(PID). <br /> I <br /> l <br /> 12-23-96 <br /> ab ratory Representative Date Reported <br /> EXC£LCHEM ENVIRONMENTAL LABS IS CERTIFIED BY THE STATE OF CALIFORNIA <br /> DEPARTMENT OF HEALTH SEPVICES AS A HAZARDOUS WASTE TESTING LABORATORY <br /> (Certification No.1760,2119) <br /> { <br />