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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 Nomellmi Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 1228 Instrument ID Var-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 8-14-97 <br />' Stockton, CA 95207 Analyst Jim Phillips Analyzed 8-1497 <br /> Attn Tim Cuellar Reported 8-22-97 <br />' QUALITY CONTROL DATA REPORT <br /> I <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 100 1 00 1 00 1 00 1 00 200 <br /> IUnits ug/L ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch # VG-8147W VB-8147W VB 8147W VB-8147W VB 8147W VB-8147W <br /> LCS % Recovery 958% 935% 884% 904% 898% 900% <br /> Surrogate Recovery 104% 101% 101% 101% 101% 101% <br /> Control Limits 70130 % 70-130 % 70 130 % 70 130 % 70 130 % 70-130 % <br /> MS/MSD Batch # VG 8147W VB 8147W VB-8147W VB 8147W VB 8147W <br /> VB 8147W <br /> I MS % Recovery 97 6% 105% 89 1% 91 2% 908% 91 8% <br /> Surrogate Recovery 105% 102% 102% 102% 102% 102% <br /> MSD % Recovery 98 3% 125% 873% 883% 89 9% 89 7% <br /> Surrogate Recovery 103% 101% 101% 101% 101% 101% <br /> Relative % Difference 0648% 180% 2 04% 2 59% 0865% 207% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 966% 974% 974% 974% 974% 974% <br /> I <br /> I 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 and are not used to accept or <br /> refect batch results <br /> �,/ANALYST APPROVED BY <br /> Clan J one Ja WC Phdllps <br /> vironmental Lab Director <br />