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I <br /> .- CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone (209)384-2930 <br /> Certificate#2480 Fax (209)384-1507 <br /> Advanced GecEnvironmental, Inc Client Project ID Rainwater Car Wash Method EPA 5030/8015M,8020 <br /> of Northern California Reference Number 4987 Instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Extracted 08-26-02 <br /> Stockton,CA 95215 Analyst Jim Phillips Analyzed 08-26-02 <br /> l Attn Tim Cuellar Reported 09-05-02 <br /> _1 <br /> QUALITY CONTROL DATA REPORT <br /> 1 ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 210 132 7 94 184 922 <br /> Units uglL ug/L uglL uglL ug/L ug/L <br /> LCS Batch# VW-8262 VW-8262 VW-8262 VW-8262 VW-8262 VW-8262 <br /> 962% 131% 111% 909% 899% 89% <br /> Surrogate Recovery 97 1% 967% 967% 967% 967% 967% <br /> Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MSIMSD Batch# VW-8262 VW-8262 VW-8262 VW-8262 VW-8262 VW-8262 <br /> Spike Concentration 110 2 10 1 32 7 94 184 922 <br /> IVIS %Recovery 523% -138% 987% 761% 681% 727% <br /> ISurrogate Recovery 974% 945% 946% 945% 945% 945% <br /> } I <br /> MSD% Recovery 522% -144% 103% 740% 656% 694% <br /> } Surrogate Recovery 949% 921% 921% 921% 921% 921% <br /> Jk Relative%Difference 0054% 226% 250% 187% 218% 249% <br /> I Methanol Blank ND ND ND ND ND ND <br /> II 1 Surrogate Recovery 959% 965% 965% 965% 965% 965% <br /> I1 <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 /> 11 reject batch results <br /> IJ <br /> i <br /> ANALYST APPROVED BY i <br /> Clary J Cone Jams t Phillips <br /> Toratory Drrector <br /> I <br />