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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 Geo Environmental, Inc. Client Project ID: Grewall's Market Method: EPA 503018015M,8020 ' of Northern California Reference Number:6151 - Instrument ID:Var-GC1 837 Shaw Road Sample Description:Water Extracted: 10-02-03 Stockton, CA 95215 Analyst: Jim Phillips Analyzed: 10-02-03 Attn: Tim Cuellar Reported: 10-14-03 1 QUALITY CONTROL DATA REPORT ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes Spike Concentration: 110 2.10 1,32 7.94 1.$4 9.22 ' Units: uglL uglL ugiL ug/L uglL uglL LCS Batch#: VW-0023 VW-0023 VW-0023 VW-0023 VW-0023 VW-0023 ' LCS % Recovery: 88.6% 109% 95.5% 90.5% 97.3% 95.6% Surrogate Recovery: 97.2% 95.7% 95.7% 95.7% 95.7% 95.7% ' . Control Lirrlits: 70-130% 70-130% 70-130% 70-130% 70-130% 70-130 ' MS/MSD Batch#: VW-0023 VW-0023 VW-0023 VW-0023 VW-0023 VW-0023 Spike Concentration: 110 2.10 1.32 7.94 1.84 9.22 ' MS% Recovery: 83.3% 129% 104% 102% 106% 105% Surrogate Recovery: 105% 103% 103% 103% 103% 103% MSD % Recovery: 79.1% 120% 98.0% 95.3% 98.7% 98.4% ' Surrogate Recovery: 98.5% 97.0% 97.0% 97.0% 97.0% 97,0% Relative%Difference: 4.57% ,� 7.30% 6.00% 6.68% 6.87_% 6.19% Methane)Bla3cn : ,c- �D� y r-�' N D ND ND NO NO ' ate Recovery: 97.6% 99.8% 99.8% 99.8% 99.8% 99.8% ' The LCS(Laboratory Check Sample)is a control sample of known, interferent free matrix that is fortified with representative analytes and P Yt anaiyzed using the same reagents,preparation and analytical methods employed for the samples. The LCS %recovery is used for validation ' of.sample.hatch results. Due to,matrix.effects,.the QC limits and recoveries for MSIMSD's are advisory only and are not used to accept or . reject batch results. ' ANALYST: _ APPROVED BY: Clan J. Cone Ja s . Phillips boratory Director 1