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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209) 384 2930 <br /> 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 1378 Instrument ID Var-GC1 <br /> 4005 N Wilson Way Matrix Soil Prepared 12-29-97 <br /> Stockton, CA 95205 Analyst Clan Cone Analyzed 12-29-97 <br /> Attn Tim Cuellar Reported 12-30-97 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 200 200 20 0 200 200 400 <br /> Units mg/kg ug/kg ug/kg ug/kg ug/kg ug/kg <br /> LCS Batch # VG-D297 VB-D297 VB-D297 VB-D297 VB-D297 VB-D297 <br /> LCS % Recovery 98 1% 112% 113% 119% 112% 118% <br /> Surrogate Recovery 104% 113% 113% 113% 113% 113% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70 130 % 70-130 % <br /> MS/MSD Batch # VG-D297 VB-D297 VB-0297 VB-D297 V6 D297 VB-D297 <br /> MS % Recovery 753% 839% 76 1% 689% 73 1% 66 5% <br /> Surrogate Recovery 876% 81 7% 81 7% 81 7% 81 7% 81 7% <br /> MSD % Recovery 708% 723% 729% 61 7% 71 2% 62 1% <br /> Surrogate Recovery 867% 81 1% 81 1% 81 1% 81 1% 81 1% <br /> Relative % Difference 5 52% 149% 430% 8 76% 2 58% 5 53% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 104% 104% 104% 104% 104% 104% <br />' Please Note <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 camnlp ha_trh results_ Due to matrix a_ffa_r_-tc the nr hmitS And rPrnvPriPs for MSIMSD's are advisory only and are not used to accew or <br /> reject batch results <br /> 7 <br /> n <br /> ANALYST APPROVED BY <br /> Clary J Cone JanXs Phillips <br /> v�onmental Lab Director <br />