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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services P O Sox 1360, Winton, CA 95388 Phone J209) 384 2930 <br /> 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 890 Instrument ID Var-GC1 <br /> 1803 West March Lane, Suite A Matrix Sail Prepared 928-96 <br /> Stockton, CA 95207 Analyst Jim Phillips Analyzed 9-29-96 <br /> Attn Tim Cuellar1L. Reported 104-96 <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-9286 VB-9286 VB-9286 VB 9286 VS 9286 <br />' LCS % Recovery 964% 130% 122% 108% 118% <br /> Surrogate Recovery 123% i 1 1% 1 1 l% 111% 1 1 1% <br /> Control Limits 70 130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> MSIMSD Batch # VG 9286 VB-9286 VB-9286 VB-9286 VB 9286 <br />' MS % Recovery 854% 105% 973% 93 9% 948% <br /> Surrogate Recovery 114% 100% 100% 100% 100% <br />' MSD % Recovery 91 0% 110% 99 7% 98 3% 97 7% <br /> Surrogate Recovery 123% 104% 104% 104% 104% <br /> Relative % Difference 6 13% 3 79% 2 10% 4 36% 2 71% <br /> Methanol Blank ND ND ND ND ND <br /> Surrogate Recovery 1 1 1% 110% 110% 110% 110% <br /> I <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 oreoaratinn and snnlytirni mathogig .--r. eA f-'k- il- rr rc ni <br /> 1r-rm — - l- tet- io EcuvEy is USeU Tor valioauon <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 /> refect batch results <br /> ANALYST APPROVED BY <br /> C ars Cone Ja s rl r s <br /> vrronmental Lab Director <br /> I <br />