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A 4 <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 /> OA/OC REPORT <br /> Attention Mr John Bower Date Analyzed 07-23-97 <br /> Secor Matrix Water <br /> 1787 Tribute Road, Suite C <br /> Sacramento, CA 95815 <br /> Project J0710-001-01 <br /> Ethyl- Total <br /> Benzene Toluene benzene Xylenes <br /> PPB PPB PPB PPB <br /> • Reporting Limit 0.5 0 5 0 5 0 5 <br /> QA/QC PARAMETER <br /> Matrix Blank ND ND ND ND <br /> PERCENT RECOVERIES <br /> Matrix Spike 97% 98% 99% 100% <br /> Matrix Spike 102% 102% 103% 105% <br /> Duplicate <br /> ppb=parts per billion=ug1L=microgram per liter <br /> ND =Not detected Compound(s)maybe 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 asorners(BTEX)are measured by extraction using EPA Method 5030 followed by analysis <br /> using EPA Method 602 which utilizes a gas chromatograph(GC)equipped with a photoionizatron detector(PID) <br /> 07-24-97 <br /> #bratory Rep esentative Date Reported <br /> EXCELCHEM ENVIRONMENTAL LABS IS CERTIFIED BY THE STATE OFCALIFORNIA <br /> DEPARTMENT OF HEALTH SERVICES AS A HAZARDOUS WAS rE TESTING LABORATORY <br /> (Certtfecanon No 2 t 19) <br /> 7 <br />