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I <br /> 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 10 Comfort Air Method EPA 503018015M,8020 <br /> of Northern California Reference Number 686 Instrument ID Var-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 3-5-96 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 3-5-96 <br /> Attn Tim Cuellar Reported 3-11-96 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 100 1 00 1 00 1 00 300 <br /> Units ugIL pglL pg1L <br /> p91L ug/L. <br /> LCS Batch # VG-3056 VB-3056 VB-3056 VB-3056 VB-3056 <br /> LCS % Recovery 112% 110% 107% 102% ill% <br /> Surrogate Recovery 906% 102% 102% 102% 102% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MS/MSD Batch # VG-3056 VB 3056 VB 3056 VB-3056 VB-3056 <br /> MS % Recovery 102% 107% 100% 102% 109% <br /> Surrogate Recovery 939% 100% 100% 100% 100% <br /> MSD % Recovery 108% 107% 100% 101% 109% <br /> Surrogate Recovery 95 6% 104% 104% 104% 104% <br /> Relative % Difference 498% 0668% 0 153% 0545% 0224% <br /> Methanol Blank ND ND ND ND ND <br /> Surrogate Recovery 102% 103% 103% 103% 103% <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 and are not used to accept or <br /> refect batch results <br /> ANALYST APPROVED BY \ <br /> Clary J Cone J es C Phillips <br /> Environmental Lab Director <br />