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'*CASTLE ANALYTICAL LABORATORY <br />' Environmental Testing Services 2333 Shuttle Drive, Atwater, CA 95301 Phone: (209) 384-2930 <br /> Certificate #2079 Fax: (209) 364-1507 <br />' Advanced GeoEnvironmental, Inc. Client Project ID: Grewals Market Method: EPA 5030/8015M,8020 <br /> of Northern California Reference Number: 2331 Instrument ID: Var-GC1 <br /> 4005 North Wilson Way Matrix: Water Prepared: 7-1-99 <br /> Stockton, CA 95205 Analyst. Jim Phillips Analyzed: 7-1-99 <br /> Attn: Tim Cuellar Reported: 7-6-99 <br /> QUALITY CONTROL DATA REPORT <br />' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Y Y <br />' Spike Concentration: 110 2.22 1.34 7.82 1.84 9.48 <br /> Units: ug/L ug/L ug/L ug/L ug/L ug/L <br />' LCS Batch #: VW-7019 VW-7019 VW-7019 VW-7019 VW-7019 VW-7019 <br /> LCS % Recovery: 90.89.6 94.70/o 94.0% 92.7% 10111 85.25/6 <br />'WS urrogate Recovery: 104% 101% 101% 101% 101% 101% <br /> Control Limits: 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % 70-130 % <br /> N <br /> MS/MSD Batch #: VW-7019 VW-7019 VW-7019 VW-7019 VW-7019 VW-7019 <br /> Spike Concentration: 124 2.22 1.34 7.82 1.84 9.48 <br /> 1 <br /> MS % Recovery: 92.2% 122% 93.6°k 96.896 105% 92.9% <br /> Surrogate Recovery: 100% 101% 101% 101% 101% 101% <br />' MSD % Recovery: 86.0% 83.5% 91.7% 98.5% 106% 94.2% <br /> Surrogate Recovery: 104% 106% 106% 106% 106% 106% <br />' Relative % Difference: 6.37% 35.2% 2.01% 1.72% 0.981% 1.33% <br /> Methanol Blank : ND ND ND ND ND ND <br />' Surrogate Recovery: 101% 100% 100% 100% 100% 100% <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 MSIMSD's are advisory.only and are not used to accept or <br /> reject batch results. <br /> ANALYST: '� APPROVED BY: <br /> Clari J. ConeJ es . Phil/ips <br />' nvironmental Lab Director <br />