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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P O Box 1360, Winton, CA 95388 Phone (209) 384-2930 <br /> Fax (209) 384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Pacific Car Wash Method EPA 503018015M,8020 <br /> of Northern California Reference Number 831 Instrument ID Var-GC1 <br /> 1803 West March Lane, Suite A Matrix Soil Prepared 8-7-96 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 8-796 <br /> Attn Tim Cuellar Reported 8-13-96 <br /> QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline Benzene Toluene Ethyl Benzene Total otal Xylenes <br />' Spike Concentration 200 200 200 200 400 <br />' Units mg/kg ug/kg ug/kg ug/kg ug/kg <br /> LCS Batch # VG-8076 VB-6076 VS-8076 VB-8076 VB-8076 <br />' LLS % Recovery 964% 100% 97 2% 93 9% 939% <br /> Surrogate Recovery 104% 96 8% 96 8% 96 8% 968% <br /> Control Limits 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MSIMSD Batch # VG-8076 VB-8076 VB 8076 VB-8076 VB 8076 <br />' MS % Recovery 663% 504% 64 1% 58 8% 56 5% <br /> Surrogate Recovery 77 5% 701% 70 1% 70 1% 70 1% <br /> MSD % Recovery 70 6% 662% 73 8% 69 9% 679% <br /> Surrogate Recovery 802% 81 5% 81 5% 81 5% 81 5% <br /> Relative % Difference 5 38% 106% 11 7% 945% 825% <br />' Methanol Blank ND ND ND ND ND <br /> Surrogate Recovery 102% 101% 101% 101% 101% <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 /> - .0y ed U-9 t,o --a ., c gents, preparat,on and analytical irnethods aniployed fur tiic zariiplus Tie LCS % recovery is usea Tor vanaation <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 /> reject batch results <br /> r�7 � <br /> ANALYST APPROVED BY <br /> Cla r J one J es C Phrlleps <br /> Environmental Cab Director <br /> I <br />