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1 <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 GeoEnvironmental, Inc Client Project ID Cal Fuels Method EPA 503018015M,8020 <br /> of Northern California Reference Number 1193 Instrument ID Ver-GCI <br /> 1803 West March Lane, Suite A Matrix Soil Prepared 7-21 97 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 7-22-97 <br /> Attn Tim Cuellar Reported 7-28-97 <br /> i <br /> QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 2 00 200 200 20 0 200 400 <br />' Units mg/kg ug/kg ug/kg ug/kg ug/kg ug/kg <br /> LCS Batch # VG-7217 VB-7217 VB-7217 VB-7217 VB-7217 VS-7217 <br /> I LCS % Recovery 102% 77 3% 970% 102% 96 7% 99 2% <br /> Surrogate Recovery 113% 109% 109% 109% 109% 109% <br />' Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch # VG 7217 VB-7217 VB 7217 VB 7217 VB-7217 VB-7217 <br /> MS % Recovery 80 1% 71 1% 58 7% 514% 57 4% 52 1% <br /> Surrogate Recovery 95 2% 570% 570% 570% 57 0% 570% <br /> MSD % Recovery 71 7% 77 5% 720% 62 3% 706% 647% <br /> Surrogate Recovery 81 2% 71 8% 71 8% 71 8% 71 8% 71 8% <br /> Relative % Difference 108% 8 62% 203% 166% 20 7% 19 1% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 105% 106% 106% 106% 106% 106% <br /> Please Note <br /> The LCS {Laboratory Check Sample► is a control sample of known, interferent free matnx 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 Icmits and recoveries for MSIMSD's are advisory only and are not used to accept or <br /> refect batch results <br /> (—�� <br /> ANALYST APPROVED BY GG <br /> Clary J Cone JaC hr!lrps <br /> nvironmental Lab Director <br />