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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. Noel Lerner Date Analyzed: 08-27-97 <br /> Helmick &Lerner, Inc. Matrix: Water <br /> 1620 Executive Court <br /> Sacramento, CA 95864 <br /> Project: 00814/Stagg H.S. <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 /> . <br /> QA/QC PARAMETER <br /> Matrix Blank ND ND ND ND <br /> PERCENT RECOVERIES <br /> Laboratory Control Spike 89% 89% 88% 89% <br /> Laboratory Control Spike 97% 97% 96% 97% <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 /> 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 isomers(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 photoionization detector(PED). <br /> 09-02-97 <br />' b atory Representative Date Reported <br /> 1 EXCELCHEM ENVIRONMENTAL LABS 15 CERTIFIED BY THE STATE OF CALIFORNIA <br /> DEPARTMENT OF HEALTH SERVICES AS A HAZARDOUS WASTE TESTING LABORATORY <br /> (Certification No.2119) <br />' 16 <br />