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I � <br /> Ile <br /> CASTLE ANALYTICAL <br /> LABORATORY <br /> ' Environmental Testing Services 2333 Shuttle Drive,Atwater CA 95301 Phone (209)384-2930 <br /> Certificate#2079 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 3387 Instrument 10 Var-GC1 <br /> 4005 North Wilson Way Matrix Water Prepared 12-20-00 <br /> Stockton,CA 95205 Analyst Jim Phillips Analyzed 12-20-00 <br /> ' Attn Tim Cuellar Reported 12-27-00 <br /> ' QUALITY CONTROL DATA REPORT <br /> ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> ' Spike Concentration 110 208 128 772 184 924 <br /> Units ug1L ug/L ug/L ug1L uglL uglL <br /> ' LCS Batch# VW-D200 VW-0200 VW-D200 VW-13200 VW-D200 VW D200 <br /> LCS % Recovery 105% 118% 112% 103% 104% 102% <br /> Surrogate Recovery 105%9 102% 102% 102% 102% 102% <br /> ' Control Limits 70-13C% 70-130% 70-130% 70-130% 70--130 % 70-130% <br /> ' MS/MSD Batch# VW-D200 VW-0200 VW-D200 VW-D200 VW-D200 VW-0200 II <br /> Spike Concentration 1 1 0 2 08 1 28 772 1 84 924 1 <br /> MS%Recovery 1385% 869% 923% 107% 105% 108%9 � <br /> ' Surrogate Recovery 110% 115% 115% 115% 115% 115% <br /> MSD% Recovery 91 4%9 908% 967% 101% 101%9 100% <br /> Surrogate Recovery 107%9 106% 106% 106% 106% 106% <br /> Relative %Difference 283% 4 37% 459% 518% 3 33% 767% <br /> ' Methanol Blank ND ND ND ND ND ND <br /> Surrogate Recovery 934% 937% 937% 937% 937% 937% <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 hatch results <br /> I <br /> ' ANALYSI APPROVED BY <br /> 40.anJone ;nwronmental <br /> C Phillips <br /> Lab Director <br /> i <br /> r <br />