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I <br /> CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209) 384-2930 <br /> Fax (209) 384-1507 <br /> Advanced GeoEnwronmental, Inc Client Project ID Pacific Car Wash Method EPA 50301$01511,8020 <br />' of Northern California Reference Number 1346 Instrument ID Var-GC1 <br /> 4005 N Wilson Way Matrix Soil Prepared 12-4-97 <br /> Stockton, CA 95205 Analyst Clan Cone Analyzed 12-5-97 <br />' Attn Tim Cuellar Reported 12-8-97 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 200 200 200 200 200 400 <br /> Units mg/kg ug/kg ug/kg ug/kg uglkg ug/kg <br /> LCS Batch# VG-D047 VS-D047 VB-D047 VB-D047 VS-D047 VB-D047 <br /> LCS % Recovery 882% 107% 644% 97 1% 968% 98 5% <br /> Surrogate Recovery 113% 103% 103% 103% 103% 103% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MSIMSD Batch # VG D047 VB-D047 VB-D047 VB-D047 VB-D047 VB-D047 <br />' MS % Recovery 78 6% 7 35% 788% 769% 773% 756% <br /> Surrogate Recovery 930% 91 5% 91 5% 91 5% 91 5% 91 5% <br /> MSD % Recovery 78 8% -368% 785% 766% 79 1% 777% <br /> Surrogate Recovery 908% 897% 897% 89 7% 89 7% 897% <br /> Relative % Difference 0243% 378% 0364% 0355% 2 15% 2 55% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 104% 104% 104% 104% 104% 104% <br /> r <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 sample batch results Due to matrix effects,the QC limits and recoveries for MSIMSD s are advisory only ano are not uses to accept ur <br /> reject batch results <br /> ANALYST , APPROVED BY <br /> Clary J Cone mes C Phihips <br /> Environmental Lab Director <br />