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f , CASTLE ANALYTICAL LABORATORY Environmental Testing Services P O Box 1360, Winton, CA 95388 Phone (209) 384 2930 Certificate ✓#2079 Fax (209) 384-1507 Advanced Geo Environmental, Inc Client Project ID 95-0132 Method EPA 5030/8015M,8020 of Northern California Reference Number 720 Instrument ID Var-GC1 1803 West March Lane, Suite A Matrix Water Prepared 4-12-96 Stockton, CA 95207 Analyst Jim Phillips Analyzed 4-12-96 Attn Tim Cuellar Reported 4-16-96 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 ug/L ug1L ug/L ug/L LCS Batch #1 VG 4126W VB-4126W VB-4126W VB 4126W VB 4126W VS-4126W LCS % Recovery 79 2% 111% 100% 106% 106% 106% Surrogate Recovery 114% 95 5% 95 5% 95 5% 95 5% 95 5% Control Limits 70-130 % 70-130 % 70-130 % 70 130 % 70-130 % 70 130 % MS/MSD Batch #J VG 4126W VB 4126W VB 4126W VB-4126W VB-4126W VB-4126W MS % Recovery 95 6% 140% 104% 107% 110% 110% Surrogate Recovery 934% 984% 984% 984% 984% 984% MSD % Recovery 96 9% 103% 108% 115% 113% 110% ' Surrogate Recovery 100% 96 8% 96 8% 968% 96 B% 9611% Relative % Difference 1 28% 307% 853% 5 85% 1 28% 0426% ' Methanol Blank ND ND ND ND ND NO Surrogate Recovery 98 7% 98 7% 98 7% 98 7% 98 7% 987% ' Please Note 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 t ^ ALYST APPROVED BY C J Cone mes C Phill ps Environmental Lab Director