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EXC E LC H E M <br /> ENVIRONMENTAL LABS <br /> s: .222 <br /> 500 Giuseppe Court, Suite 9 0 <br /> Roseville, CA 95678 <br /> Phone#: (916) 773-3664 Fax#: (916) 773-4784 <br /> QA/OC REPORT <br /> Attention: Mr. Gary Barker Date Analyzed: 04-09-97 <br /> Horizon Environmental Matrix: Water <br /> 5011 Golden Foothill Pkwy, Ste 7 <br /> El Dorado Hills, CA 95762 <br /> Project: 3001.11/Discovery Chevrolet <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 90% 90% 86% 86% <br /> Matrix Spike 900/0 90% 87% 87% <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 photoiouization detector(PID). <br /> 04-15-97 <br /> ab ratory Representative Date Reported <br /> f - <br /> EaCELCHENI ENVIRONMENTAL LABS IS CERTIFIED BY THE STATE OF CALIFORNIA <br /> DEPARTNIENT OF HEALTH SERVICES AS A HAZARDOUS WASTE TESTING LABORATORY <br /> (Cedificafion No.1760) <br />