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• CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive Atwater CA 95301 Phone (209)384-2930 <br /> Certificate#2480 Fax (209)384-1507 <br /> Advanced GeoEnvironmental Inc Client Project ID Top Filling Method EPA 5030/8015M 8020 <br /> of Northern California Reference Number 5034 Instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Extracted 09-05-02 <br /> Stockton, CA 95215 Analyst Jim Phillips Analyzed 09-05-02 <br /> Attn Tim Cuellar Reported 09-12-02 <br /> I <br /> IQUALITY CONTROL DATA REPORT <br /> IANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> I Spike Concentration 110 2 10 1 32 194 184 922 <br /> Units ug/L ug1L uglL ug1L ug/L ug1L <br /> LCS Batch# VW-9052 VW-9052 VW-9052 VW-9052 VW-9052 VW-9052 <br /> LCS % Recovery 898% 121% 102% 91 0% 91 8% 897% <br /> Surrogate Recovery 988% 957% 957% 957% 957% 957% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130 % 70-130% <br /> MS/MSD Batch# VW-9052 VW-9052 VW-9052 VW-9052 VW-9052 VW-9052 <br /> Spike Concentration 110 2 10 1 32 794 1 84 9 22 <br /> MS % Recovery 111% NA" 960% 107% 968% 115% <br /> Surrogate Recovery 102% 129% 129% 129% 129% 129% <br /> MSD% Recovery 980% NA" 925% 105% 986% 109% <br /> Surrogate Recovery 979% 115% 115% 115% 115% 115% <br /> Relative%Difference 11 1% NA' 338% 198% 1 73% 532% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 91 1% 923% 923% 923% 923% 923% <br /> 'Recoveries not calculated due to matrix interference <br /> The LCS (Laboratory Check Sample)is a control sample of known, interferent free matrix that is fortified with representative analytes and <br /> analyzed using the same reagents,preparation and analytical methods employed for the samples The LCS %recovery is used for validation <br /> 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 <br /> reject batch results <br /> C' ANALYST PROVED BY <br /> Clan J Cone jameyt Phi ps <br /> Lab tory Director <br />