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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P O Box 1360, Winton, CA 95388 Phone (209) 384-2930 <br />' Certificate #2079 Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Comfort Air, Inc Method EPA 5030/8015M,8020 <br />' of Northern California Reference Number 1023 Instrument ID Var GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 2-24-97 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 2-24-97 <br /> Attn Tim Cuellar Reported 3-3-97 <br /> 1 <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 ug/L ug/L ug/L ug/L ug/L ug/L <br />' LCS Batch # VG-2247W VB 2247W VB-2247W VB 2247W VB-2247W VB-2247W <br /> LCS % Recovery 104% 111% 95 5% 102% 98 7% 101% <br /> Surrogate Recovery 102% 101% 101% 101% 101% 101% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70.130 % 70-130 % 70-130 % <br />' MS/MSD Batch # VG-2247W VB 2247W VB 2247W VB-2247W VB-2247W VB-2247W <br /> MS % Recovery 85 2% 100% 860% 887% 947% 92 7% <br /> Surrogate Recovery 100% 965% 96 5% 96 5% 96 5% 96 5% <br />' MSD % Recovery 89 1% 124% 860% 866% 93 8% 920% <br /> Surrogate Recovery 98 3% 963% 963% 96 3% 96 3% 963% <br /> Relative % Difference 429% 21 5% 0045% 2 13% 0976% 0823% <br /> Methanol Blank ND ND ND ND ND ND <br />' Surrogate Recovery 105% 104% 104% 104% 104% 104% <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 OC limits and recoveries for MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> ANALYST APPROVED BY <br /> G r J Cone h�lips <br /> Enrronmental Lab Director <br /> 1 <br />