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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 /> OA/OC REPORT <br /> Attention Mr John Bower BTEX Analyzed 05-28/29-96 <br /> SECOR Matnx Water <br /> 1734 34th Street <br /> Sacramento, CA 95816-7004 <br /> Project Time Oil-Lockeford <br /> Ethyl- Total <br /> Benzene Toluene benzene Xylenes <br /> PPB PPB PPB PPB <br /> Reportlrig Llnut 05 05 0 5 0 5 <br /> QA/QC PARAMETER <br /> Matrix Blank ND ND ND ND <br /> PERCENT RECOVERIES <br /> Matrix Spike 86% 80% 80% 72%* <br /> Matrix Spike 96% 92% 92% 77%* <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 reporting limit <br /> =Low recovery due to matrix interference effect <br /> All surrogate recoveries were within 30%of target values. <br /> Spikes do Spike Duplicates were each spiked with 250 ng BTEX standard <br /> ANALYTICAL PROCEDURES <br /> HTH_Benzene,toluene,ethylbenzene,and total xylene isomers(BTEX)are meiuued by extraction using EPA Method 5030 followed by analysts <br /> using EPA Method 602 wtucb utilizes a gas chromatograph(GC)equipped with a photow uzatton detector(PID) <br /> 05-30-96 <br /> ry Representative Date Reported <br /> DCC EMN ENVIRONMENTAL LABS IS BY THE5TATE OF CAI.FDRN A <br /> DEPAMUENTOF HEALTH SERVICES AS A HAZAROdIl5 WASTETE nNC LABORATORY <br /> (Certaficstrnm Na 17601 <br />