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1 <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 GeoEnvironmental Inc Client Project ID Rainwater Car Wash Method EPA 5030/8015M,8020 <br /> ' of Northern California Reference Number 5103 Instrument ID Var-GC1 <br /> 837 Shaw Road Sample Description Water Extracted 10-01-02 <br /> Stockton,CA 95215 Analyst Jim Phillips Analyzed 10-01-02 <br /> Attn Tim Cuellar Reported 10-10-02 <br /> QUALITY CONTROL DATA REPORT <br /> ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> SpEke Concentration 110 210 1 32 7 94 1 84 922 <br /> Units ug1L uglL uglL ug/L ug1L ugIL <br /> LCS Batch# VW-0012 VW-0012 VW-0012 VW-0012 VW-0012 VW-0012 <br /> ' LCS%Recovery 104% 113% 114% 981% 100% 976% <br /> Surrogate Recovery 108% 105% 105% 105% 105% 105% <br /> ' Control Limits 70-130% 70-130% 70-130% 70-130% 70-130% 70-130% <br /> MSIMSD Batch# VW-0012 VW-0012 VW-0012 VW-0012 VW-0012 VW-0012 <br /> Spike Concentration 110 210 1 32 7 94 184 922 <br /> ' MS%Recovery 845% 127% 114% 929% 927% 934% <br /> Surrogate Recovery 104% 101% 101% 101% 101% 101% <br /> MSD%Recovery 831% 118% 112% 909% 909% 926% <br /> ' Surrogate Recovery 102% 984% 984% 984% 984% 984% <br /> Relative°/a Difference 142% 659% 1 28% 212% 1 91% 0900% <br /> Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 103% 106% 106% 106% 106% 106% <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 /> 1 <br /> r <br /> ' ANALYST APPROVED BY <br /> Clan J Cone J Phillips M <br /> aboratory Director <br /> I ' <br />