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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P 0 Box 1360, Winton, CA 95388 Phone (209) 384-2930 <br /> ' Certificate #2079 Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Pacific Car Wash Method EPA 5030/8015M 8020 <br /> ' of Northern California Reference Number 922 Instrument ID Vat-GC1 <br /> 1803 West March Lane, Suite A Matrix Water Prepared 11 2-96 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 11-2-96 <br /> Attn Tim Cuellar Reported 11-796 <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& ug/L ug/L ug/L ug/L <br /> LCS Batch # VG-N026W VB-N026W VB N026W VB N026W VB-N026W VB N026W <br /> LCS % Recovery 104% 128% 109% 120% 112% 117% <br /> wSurrogate Recovery 106% 102% 102% 102% 102% 102% <br /> Control Limits 70 130 % 70 130 % 70-130 % 70-130 % 70 130 % 70-130 % <br />' MS/MSD Batch # VG-N026W VB N026W VB N026W VB N026W VB-N026W VB N026W <br /> MS % Recovery 94 1% 346% 86 3% 874% 97 5% 952% <br />' Surrogate Recovery 107% 101% 101% 101% 101% 101% <br /> MSD % Recovery 940% 465% 85 9% 87 2% 101% 95 7% <br /> Surrogate Recovery 107% 102% 102% 102% 102% 102% <br /> Relative % Difference 000744% 122% 0 149% 0 174% 1 77% 0439% <br />' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 105% 104% 104% 104% 104% 104% <br /> I Please Note <br /> The LCS (Laboratory Check Sample) is a control sample of known IntPrfPranr free mnt—that f—s a <br /> vv1L11 +GN1V,,U1 tduve dnaryies ano <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 /> Ireject batch r,suits <br /> ANALYST APPROVED BY <br /> Clary J Cone mes C Phillips <br /> Environmental,Cab Director <br />