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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 Geo Environmental, Inc Client Project ID Comfort Air Method EPA 5030/8015M,8020 <br />' of Northern California Reference Number 1131 Instrument ID Var GC1 <br /> 1803 West March Lane Suite A Matrix Water Prepared 5 27-97 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 5 27-97 <br /> Ann Tim Cuellar Reported 64-97 <br />' QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br />' Spike Concentration 100 1 00 1 00 1 00 1 00 200 <br /> Units uglL uglL uglL ug1L ug/L uglL <br />' LCS Batch # VG 5277W VB-5277W VB-5277W VB 5277W VB 5277W VB-5277W <br /> LCS % Recovery 77 7% 104% 91 2% 974% 93 6% 947% <br /> Surrogate Recovery 995% 96 5% 96 5% 96 5% 96 5% 965% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70 130 % <br />' MSIMSD Batch # VG-5277W VB 5277W VB 5277W VB-5277W VB 5277W VB-5277W <br /> MS % Recovery 62 3% 947% 983% 92 1% 91 9% 932% <br /> Surrogate Recovery 106% 101% 101% 101% 101% 101 <br />' MSD % Recovery 540% 106% 78 7% 760% 89 6% 923% <br /> Surrogate Recovery 113% 101% 101% 101% 101% 101% <br />' Relative % Difference 900% 11 5% 22 1% 182% 2 41% 0 891% <br />' Methanol Blank ND ND Nil ND ND ND <br /> Surrogate Recovery 101% 100% 100% 100% 100% 100% <br />' The LCS ;Laboratory Check Sample) is a control sample of known, interferent free matrix that is fortified with representative anaiytes 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 OC limits and recoveries for MSIMSD s are advisory only and are not used to accept or <br /> refect batch results <br /> ANALYSTAPPROVED BY �, <br /> C an Cone rr) C Phillips <br /> Environmental Lab director <br />