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CASTLE ANALYTICAL LABORATORY Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone: (209)384-2930 Certificate#2480 Fax: (209)384-1507 Advanced GeoEnvironmental, Inc. Client Project ID:Grewals Market Method: EPA 5030/8015M,8020 ' of Northern California Reference Number: 5186 Instrument ID:Var-GC1 837 Shaw Road Sample Description:Water Extracted: 11-04-02 Stockton, CA 95215 Analyst: Jim Phillips Analyzed: 11-0402 Attn:Tim Cuellar Reported: 11-07-02 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 ug1L ug/L ug/L ug/L ' LCS Batch#: VW-N042 VW-N042 VW-N042 VW-N042 VW-N042 VW-NO42 LCS%Recovery: 111% 87A% 95.00A 92.2% 104% 99.9% Surrogate Recovery: 103% 101% 101% 101% 101% 101% ' . Control Limits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% ' MS/MSD Batch#: VW-N042 VW-N042 VW-N042 VW-N042 VW-N042 VW-N042 Spike Concentration: 110 2,10 1.32 7.94 1,84 9.22 ' MS%Recovery: 98.9% 148% 102% 96.4% 108% 106% Surrogate Recovery: 106% 103% 103% 103% 103% 103% MSD%Recovery: 107% 156% 103% 96.9% 109% 105% ' Surrogate Recovery: 101% 97.7% 97.7% 97.7% 97.7% 97.7% Relative%Difference: 7.17% 5.40% 0.646% 0.564% 0.929% 0.658% ' Methanol Blank: ND ND ND ND ND ND Surrogate Recovery: 97.0% 97.7% 97.7% 97,7% 97.7% 97.7% 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 MSIMSD's are advisory only and are not used to acceptor- reject batch results. (&a ' ANALYST: a APPROVED BY: Clari J. Cone Ja es hillips aboratory Director