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I <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 /> QA/QC REPORT <br /> Attention Mr Matthew Taylor MBTEX Analyzed 05-13-96 <br /> WALLACE-KUHI.&ASSOCIATES Matrix Water <br /> 3050 Industnal Blvd <br /> West Sacramento, CA 95691 <br /> Project 2938 031 P 0 1283 <br /> Ethyl- Total <br /> Benzene Toluene benzene Xylenes MTBE <br /> PPB PPB PPB PPB PPB <br /> Reporting Limit 0 5 0 5 0 5 05 0 5 <br /> QA/QC PARAMETER <br /> Matrix Blank ND ND ND ND ND <br /> PERCENT RECOVERIES <br /> Matrix Spike 97% 96% 97% 97% 105% <br /> Matnx Spike 101% 100% 101% 102% 118% <br /> Duplicate <br /> ppb=parts per bdhon=uglL=nuc ogcam per liter <br /> ND =Not ddec ted, Co Twnd(s)may be presact at cortoerlra —below the repmtmg Lunt. <br /> Ail surrogate recovetxs were within 301/6 of target vahK& <br /> Spike,&spike Duphcates were each spiced with 250 ng BTEX stoulard. <br /> ANALYTICAL PROCEDURES <br /> BTEX—Bade,toluene,ttJwlbenzere,and total xylene cson—(HTE\)are ntea 2� by'A action using EPA Method 5030 followed by analysis usuig EP A <br /> Method 602 which utthm a gas chrornatoeraph(GC)equipped with a photatontzauon detector(PID) <br /> NME(Med O Tert-Butyl EtheO—WME is analyzed by EPA Method 602 winch utilizes a gas dffocnawgaph(GC)aquipped with a photoioca=on detector <br /> (PID) <br /> 05-14-96 <br /> Date Reported <br /> Lab ratory Repr tative <br />