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i. <br /> 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. John Bower BTEX Analyzed: 12-26-96 <br /> Secor Matrix: Water <br /> 1787 Tribute Rd., Suite C <br /> Sacramento, CA 95815 <br /> Project: Jo710-001-01/L00O2 <br /> TIME OIL-Lockeford, CA <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 87% 87% 890/0 89% <br /> Matrix Spike 90% 90% 91% 91% <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 RTEX standard. <br /> ANALYTICAL PROCEDURES <br /> BTEX—Benzene,toluene,cthylbenzene,and total xylene isomers(BTEX)arc 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(PID). <br /> V <br /> 01-03-97 <br /> Lab ratory Representative Date Reported <br /> EXCELCHEM ENVIRONMENTAL LABS IS CERTIFIED BY THESTATE OF CALIFORNIA <br /> DEPARTMENT OF HEALTH SERVICES AS A HAZARDOUS WASTE I ES I NG LABORATORY <br /> 17F 1 <br />