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EXCELCHEM <br /> i ENVIRONMENTAL LABS <br /> 500 Giuseppe Court, Suite 9 <br /> Roseville, CA 95678 <br /> Phone#: (916) 773-3664 Fax#: (916) 773-4784 <br /> A/ C REPORT <br /> Attention: Mr. Noel Lerner Date Analyzed: 01-07-97 <br /> Helmick&Lerner, Inc. Matrix: Soil <br /> ) 1620 Executive Court <br /> Sacramento, CA 95864 <br /> Project: 00811/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 /> Matrix Spike 107% 107% 107% 109% <br /> -- Matrix Spike 110% 109% 109% 111% <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 /> ANALYTICAL PROCEDURES <br /> BTEX--Benzene,toluene,ethylbenzene,and total xylene isomers(BTEX)are measured by extraction using EPA Method 5030 followed by analysis <br /> using EPA Method 8020 which utilizes a gas chromatograph(GC)equipped with a photoionization detector(PID). <br /> i 01-07-97 <br /> ab atony Rep esentative Date Reported <br /> EXCELCHEM ENVIRONMENTAL LABS IS CERTIFIED BY THE STATE OF CALIFORNIA <br /> DEPARTMENT OF HEALTHSERVICES AS A HAZARDOUS WASTE TESTING LABORATORY <br /> (C—liheelion No,1760,2119) <br />