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�• CASTLE ANALYTICAL RY E LABORATORY an O Environmental Testing Services 2333 Shuttle Drive,Atwater, CA 95301 - Phone: (209)384-2930 Certificate#2480 Fax: (209)384-1507 Advanced GeoEnvironmental, Inc. Client Project fD:Grewals Market Method: EPA 503018015M,8020 of Northern California Reference Number:4300 Instrument ID:Var-GC1 837 Shaw Road Sample Description:Water Prepared: 12-20-01 Stockton,CA 95215 Analyst: Jim Phillips Analyzed: 12-20-01 Attn:Tim Cuellar Reported:01-02-02 1 ' QUALITY CONTROL DATA REPORT ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes ' Spike Concentration: 110 2.10 1.32 7.94 1.84 9.22 Units: ug/L ug/L ug/L ug/L ug/L ug/L LCS Batch#: VW-0201 VW-0201 VW-D201 VW-D201 VW-D201 VW-0201 104% 105% 94.6% 98.4% 104% 101% Surrogate Recovery: 99.7% 97.5% 9T5% 97.5% 97.5% 97.5% ,. Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% ' MS/MSD Batch#: VW-D201 VW-D201 VW-0201 VW-D201 VW-D201 VW-D201 Spike Concentration: 110 2.10 1.32 7.94 1.84 9.22 MS% Recovery: NA* NA* NA* NA* NA* NA* Surrogate Recovery: NA* NA* NA* NA' NA' NA* MSD %Recovery: NA* NA* NA* NA* NA* NA* Surrogate Recovery: NA* NA* NA* NA* NA* NA* Relative%Difference: NA* NA* NA* NA* NA* NA* Methanol Blank : ND ND ND ND ND ND Surrogate Recovery: 89.9% 91.5% 91.5% 91.5% 91.5% 91.5% ' 'Matrix recoveries not calculated due to matrix interference. 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. I ANALYST: APPROVED BY: ri J. Cone mes . PhiNips Laboratory Director