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1 ' . CASTLE ANALYTICAL LABORATORY ' Environmental Testing Services P O Box 1360, Winton, CA 95388 Phone {209) 384 2930 Certificate 42079 Fax 12091 384-1507 Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Method EPA 5030/8015M 8020 ' of Northern California Reference Number 975 Instrument ID Var GC1 1803 West March Lane, Suite A Matrix Wa er Prepared 12-31-96 Stockton, CA 95207 Analyst Jim Phillips Analyzed 12 31-96 ' Attn Tim Cuellar Reported 1 7 97 ' QUALITY CONTROL DATA REPORT ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes ' Splke Concentration 100 1 00 1 00 1 00 1 00 200 Units ug/L ug/L ug/L ug/L- ug/L ugIL LCS Batch # VG-D316W V8 D316W VB D316W VB-D316W VB-D316W VB-D316W • LCS % Recovery NA' NA' NA" NA' NA' NA' ' Surrogate Recovery NA' NA' NA' NA' NA' NA' Control Limits 70 130 % 70 130 'o 70-130 % 70-130 % 70 130 % 70-130 % ILCSAILCSB Batch # VG D31 5W VB D316VV VB D316W VB D316W VB-D316W VB D316W LCSA % Recovery 943% 97 8% 96 9% 105% 104% 105% Surrogate Recovery 110% 109% 109% 109% 109% 109% LCSB % Recovery 90 9% 99 3% 972% 106% 107% 107% Surrogate Recovery 104% 100% 100% 100% 100% 100% Relative % Difference 363% 1 56% 0 319% 1 61% 2 37% 2 22% Methanol Blank ND ND ND ND ND ND Surrogate Recovery 108% 108% 108% 108% 108% 108% ' Note No matrix spikes run for this set due to matrix interference Duplicate control spikes were analyzed and are reported below The LCS (Laboratory Check Sample) is a control sample of known, interferent free matrix that is fortified with representative analytes and I 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 recoveroes for MSIMSD's are advisory only and are not used to accept or reject batch results ANALYST APPROVED BY Carr J Cone Ja es C Phrlh s nvuonmental Lab Director