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i i CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone (209) 384-2930 Certificate #2079 Fax (209) 384 1507 Advanced GeoEnvuonmental, Inc Client Project ID Pacific Pride EI Dorado Method EPA 5030/8015M,8020 of Northern California Reference Number 2678 Instrument ID Var-GC1 4005 North Wilson Way Matrix Soil Prepared 12 20-99 Stockton CA 95205 Analyst Clan Cone Analyzed 112-23-99 Attn Tim Cuellar Reported 1 400 1 QUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration 2 20 42 1 30 1 150 36 5 179 ' Units mg/kg ug/kg ug/kg ug/kg uglkg ug/kg LCS Batch # VS D209 VS D209 VS-D209 VS-13209 VS-D209 VS-13209 ' LCS % Recovery 87 8% 110% 763% 95 7% 100% 941% Surrogate Recovery 101% 99 8% 99 8% 99 8% 99 8% 998% Control Limas 70 130 % 70-130 % 70 130 % 70 130 % 70130 % 70 130 % MS/MSD Batch # VS-0209 VS D209 VS D209 VS-D209 VS D209 VS-D209 ' MS % Recovery 660% 75 2% 47 3% 63 1% 64 5% 614% Surrogate Recovery 689% 66 1% 66 1% 66 1% 66 1% 66 1% ' MSD % Recovery 53 0% 748% 50 9% 664% 67 5% 644% Surrogate Recovery 703% 684% 684% 684% 684% 684% Retative % Difference 208% 0420% 703% 4 97% 4 41% 466% ' Methanol Blank ND ND ND ND ND ND Surrogate Recovery 102% 966% 96 60/0 966% 966% 966% ' 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 ' re)ect batch results w ' ANALYST APPROVED BY Clan J Cone Ja e C hrllrps nvlronmental Lab Director