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r , <br /> EXCELCHEM <br /> ENVIRONMENTAL LABS <br /> 500 Giuseppe Court, Suite 9 <br /> Roseville, CA 95678 <br /> Phone# (916) 773-3664 Fax# (916) 773-4784 <br /> I <br /> QA/QC REPORT <br /> Attention Mr John Bowel Date Analyzed 10-17-97 <br /> Secol Matrix Watel <br /> 1787 Tribute Road, Suite C <br /> Saciarnento, CA 95815 <br /> Project J0710-001/Time 01I <br /> Ethyl- Total <br /> Benzene Toluene benzene Xylenes <br /> PPB PPB PPB PPB <br /> Reporting Linut 0 5 0 5 0 5 0 5 <br /> QA/QC A/ C PARAMETER <br /> Matrix Blank ND ND ND ND <br /> PERCENT RECOVERIES <br /> Matrix Spike 98% 97% 96% 95% <br /> Matrix Spike 101% 100% 99% 98% <br /> Duplicate <br /> ppb=parts per billion=ug/L=microgram per liter <br /> ND =Not detected Compound(s)may be present at concentrations below the reporttng limit <br /> All surrogate reco%eves were withtn 30%of target values <br /> Spikes&Spike Dupheates 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 analysts <br /> using EPA Method 602 which utilizes a gas chromatograph(CFQ equipped with a phototonization detector(PtD) <br /> 10-22-97 <br /> �abo tory Representative Date Reported <br /> EXCELCHEM ENVIRONMENTAL LABS IS CERTIFIED BY THE STATE OF CALIFORNIA <br /> DEPARTMENT OF HEALTH SERVICES AS A HAZARDOUS WASTE TESTING t ABORATORY <br /> (CcruGcauon No 2119) <br /> 6 <br />