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EXCELCHEM <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 /> Attention Mr Alan Klein Date Analyzed 03-21-97 <br /> Fugro/ENSR Matrix Water <br /> 1050 Melody Lane Suite 160 <br /> Roseville, CA 95678 <br /> Project 9647-0771/Lopez Property <br /> Ethyl- Total <br /> Benzene Toluene benzene Xylenes <br /> PPB PPB PPB PPB <br />. Reportirig 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 104% 106% 106% 107% <br /> Matrix Spike 106% 107% 107% 108% <br /> Duplicate <br /> ppb=parrs per billion-ug/L=microgram per Mer <br /> PID =Not detected Compound(s)may be present at concentrabons below the reporting limit <br /> AU 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($TEX)are measured by extraction using EPA Method 5030 followed by analysts <br /> using EPA Method 602 which utilizes a gas chromatograph(GC)equipped with a phototonization detector(PID) <br /> 03-24-97 <br /> oratory Representative Date Reported <br /> EXCELCHEM ENVIRONMENTAL LABS IS CERTIFIED BY TH E STATE OF CALIFORNIA <br /> DEPARTMENT OF HEALTH SERVICI S 15 %H\ZARDOUS WASTE TESTING LABORATORY <br /> (CLrttlSation No 1760) <br />