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T LABORATORY <br /> CASTLE ANALYTICAL LABORA O Y <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 Rainwater Car Wash Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 52220(1-10) Instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Extracted 11-16-02 <br /> Stockton CA 95215 Analyst Jim Phillips Analyzed 11-16-02 <br /> Attn Tim Cuellar Reported 11-26-02 <br /> ' QUALITY CONTROL DATA REPORT <br /> ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> ' Spike Concentration 110 210 1 32 7 94 1 84 922 <br /> Units ug1L ug/L ug1L ug/L ug/L ug1L <br /> LCS Batch# VW-N152 VW-N152 VW-N152 VW N152 VW-N152 VW-N152 <br /> LCS% Recovery 108% 885% 887% 890% 990% 965% <br /> Surrogate Recovery 101% 990% 990% 990% 990% 990% <br /> ' Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> ' MS/MSD Batch# VW-N152 VW-N152 VW-N152 VW-N'152 VW-N152 VW-N152 <br /> Spike Concentration 110 210 132 7 94 1 84 922 <br /> ' MS%Recovery 102% 729% 824% 954% 103% 105% <br /> Surrogate Recovery 103% 107% 107% 107% 107% 107% <br /> MSD% Recovery 105% 860% 865% 965% 105% 106% <br /> ' Surrogate Recovery 108% 109% 109% 109% 109% 109% <br /> Relative%Difference 275% 153% 490% 1 16% 246% 104% <br /> ' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 100% 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 MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> F <br /> �61 <br /> ' ANALYST APPROVED BY t fl <br /> Clan J Cone mes C Phillips, <br /> ahoratory Director <br /> I ` <br />