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� c <br /> EXCELCHEM <br /> ENVIRONMENTAL LABS <br /> � W e <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. Gary Barker Date Analyzed: 04-08-97 <br /> Horizon Environmental <br /> 5011 Golders Foothill Pkwy, Ste 7 <br /> El Dorado Hills, CA 95762 <br /> Project : 3001.11/Discovery Chevrolet Matrix: Water <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 94% 95% 96% 95% <br /> Matrix Spike 90% 91% 92% 92% <br /> Duplicate <br /> ppb=pars per billion=ug/L=microgram per liter <br /> ND =Not detected. Compound(s)may he present at concentrations below the reporting limit. <br /> All surrogate recoveries were within 30%of target valves. <br /> Spikes&Spike Duplicates were each spiked with 250 ng BTE<standard. <br /> ANALYTICAL PROCEDURES <br /> BTEx--Benzene,toluene,ethylbenzene,and total xylene isomers(BTE.1)are measured by extraction using EPA Method 5030 followed by analysis <br /> using EPA Method 602 which utilizes a gas chromatograph(CC)equipped with a photoionizatiou detector(PID). <br /> 04-16-97 <br /> ab ratory Representative Date Reported <br /> EXCELCHEM ENVIRON6[ENTAL LABS IS CERTIFIED BY THE STATE OF CALIFORNIA <br /> DEPARTMENTOF HEALTH SERVICES AS A HA7-4RDOUS WASTE TESTING LABORATORY <br /> (Certification No,1700) <br /> I <br />