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i <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater, CA 95301 Phone (209)384-2930 <br /> Certificate#2079 Fax (209)384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Pacific Car Wash Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 3167 Instrument ID Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 8-24-00 <br /> Stockton,CA 95205 Analyst Jim Phillips Analyzed 8-24-00 <br /> Attn Tim Cuellar Reported 8-31-00 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 222 1 34 782 1 84 948 <br /> Units ug/L ug/L ug/L ug/L ug/l- ug/L <br /> LCS Batch# VW-8240 VW-8240 VW-8240 VW-8240 VW-8240 VW-8240 <br /> LCS %Recovery 877% 131% 874% 832% 877% 81 2% <br /> Surrogate Recovery 964% 883% 883% 883% 883% 883% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MS/MSD Batch# VW-8240 VW-8240 VW-8240 VW-8240 VW-8240 VW-8240 <br /> Spike Concentration 110 222 134 782 184 948 <br /> MS% Recovery 842% 91 5% 745% 804% 834% 785% <br /> Surrogate Recovery 957% 851% 85 1% 851% 851% 85 1% <br /> MSD% Recovery 861% 926% 81 6% 790% 827% 780% <br /> Surrogate Recovery 969% 839% 839% 839% 839% 839% <br /> Relative%Difference 222% 1 13% 901% 174% 0846% 0658% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 906% 820% 820% 820% 820% 820% <br /> The LCS(Laboratory Check Sample)is a control sample of known, interferent free matrix that is fortified with representative analytes and <br /> analyzed using the same reagents, preparation and analytical methods employed for the samples The LCS%recovery is used for validation <br /> of sample batch resultg nw.to matrix F-M-r_N tha QC hmrt¢anti rorYrnrenog fpr hJS1RACn'n ora arlvmnnr only and ora not im-1 to ar�npF <br /> reject batch results <br /> ANALYST V APPROVED BY <br /> Clan J Cone Jam C la ►1&ps <br /> E rronmental Lab Director <br /> f <br />