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CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209) 3842930 Certificate #2079 Fax (209) 384-1507 ' Advanced GeoEnvironmental, Inc Client Protect ID Pacific Car Wash Method EPA 5030/8015M,8020 of Northern California Reference Number 1465 Instrument ID Var-GC1 1803 West March Lane, Suite A Matrix Water Prepared 2-20-97 Stockton CA 95207 Analyst Jim Phillips Analyzed 2-20-97 Attn Tim Cuellar Reported 2-25-98 ' QUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration 100 1 00 1 00 1 00 1 00 200 Units ug/L ug/L ug1L ug/L ug/L ug/L LCS Batch # VG-2208W VB-2208W VB 2208W VB-2208W VB-2208W VB-2208W LCS % Recovery 930% 121% 942% 982% 100% 99 7% Surrogate Recovery 110% 107% 107% 107% 107% 107% Control Limits 70-130 % 70130 % 70-130 % 70-130 % 70-130 % 70-130 % MS/MSD Batch # VG-2208W VB 2208W VB 2208W VB-2208W VB-2208W VB-2208W MS % Recovery 609% 504% 87 7% 843% 950% 992% Surrogate Recovery 113% 108% 108% 108% 108% 108% MSD % Recovery 61 7% NA' 96 3% 884% 81 1% 782% Surrogate Recovery 1 1 i% 854% 854% 854% 85 4% 854% Relative % Difference 0488% NA 565% 430% 148% 18 90/6 Methanol Blank ND ND ND ND ND ND Surrogate Recovery 110% 1 1 1% 111% 111% 1 1 1% ill% •Instrument purge tube contaminated with MTBE The LCS (Laboratory Check Sample) is a control sample of known, interferent free matrix that is fortified with representative analytes and analyzed using the same reagents, preparation and analytical methods employed for the samples The LCS % recovery is used for validation of sample batch results Due to matrix effects, the QC limits and recoveries for MS/MSD's are advisory only and are not used to accept or reject batch results EANALYST OL APPROVED B Clary J Cone Ja es Phillips nvironmental Lab Director,