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ui " r ' • CASTLE ANALYTICAL LABORATORY Environmental Testing Services P 0 Box 1360, Winton, CA 95388 Phone (209) 384-2930 Certificate #2079 Fax (209) 384-1507 Advanced GeoEnvironmental, Inc Client Project ID Nomellini Con Method EPA 503018015M,8020 of Northern California Reference Number 952 Instrument ID Var-GC1 1803 West March Lane, Suite A Matrix Water Prepared 12-3-96 Stockton, CA 95207 Analyst Jim Phillips Analyzed 12-3-96 Attn Tim Cuellar Reported 12-6-96 L- .-:J QUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration 100 1 00 1 00 1 00 1 00 2 00 Units ug/L ug/L ug/L ug/L ug/L ug/L LCS Batch # VG-D036W VS-D036W VB-D036W VB D036W VB D036W VB 0036W LCS % Recovery 97 0% 118% 107% 112% 111% 112% Surrogate Recovery 102% 99 5% 99 5% 995% 99 5% 99 5% Control Limits 70 130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % MSIMSD Batch # VG-D036W VB D036W VB D036W VB-D036W VB D036W VB-DO36W MS % Recovery 166% 100% -5 93% 60 1% 92 1% 982% Surrogate Recovery 108% 101% 101% 101% 101% 101% MSD % Recovery 160% 105% -179% 26 3% 85 2% 84 7% Surrogate Recovery 109% 104% 104% 104% 104% 104% Relative % Difference 1 77% 460% 348% 2 14% 0952% 1 84% Methanol Blank ND ND ND ND ND ND Surrogate Recovery 933% 974% 974% 974% 974% 974% Note The MS & MSD samples were spiked on sample Lab ID # 952-9W 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 OC limits and recoveries for MSIMSD's are advisory only and are not used to accept or reject batch results ! `)l ANALYST _ �'Y" APPROVED BY air J Cone ;Jas Phillips enral Lab Director