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7. L <br /> ENVIRONMENTAL LABS <br /> � 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 John Bower BTEX Analyzed 02-10-98 <br /> Secor Matrix Water <br /> 1787 Tribute Rd , Ste C <br /> Sacramento, CA 95815 <br /> Project 7G 005-001-01/Time Oil <br /> Ethyl- Total <br /> Benzene Toluene benzene Xylenes <br /> PPB PPB PPB PPB <br /> Re ortinLHrut 05 0 5 0 5 0 5 <br /> QA/QC PARAMETER <br /> • Matrix Blank ND ND ND ND <br /> PERCENT RECOVERIES <br /> Laboratory Control Spike 98% 98% 98% 99%Q <br /> Laboratory Control Spike 98% 98% 98% 98% <br /> Duplicate <br /> ppb=parts per billion=ugIL=trucmgram per liter <br /> ND =Not detected Compound(s)may he present at concentrations below the reporting hrrut <br /> All surrogate recovenes 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 EFA Method 602 which utilizes a gas chromatograph(GC)equipped with a photoionization detector(PID) <br /> 02-12-98 <br /> La oratory esentative Date Reported <br /> EXCELCHEM ENVIRONMENTAL LABS IS CERTIFIED BY THE STATE OF CALIFORNIA <br /> DEPARTMENT OF HEAI Tit SERVICES AS A HAZARDOUS WASTE TESTING LABORATORY <br /> (Certi[Icadon Na 2119) <br /> 2 <br />