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' CASTLE ANALYTICAL LABORATORY <br /> ' Environmental Testing Services 2333 Shuttle Drive Atwater,CA 95301 Phone (20 <br /> Certificate9)384-2930 <br /> #2079 Fax (209)384-1507 <br /> [[At1n <br /> dvanced GeoEnvironmental Inc Client Project ID Rainwater Car Wash Method EPA 503018015M,8020 <br /> ' f Northern California Reference Number 3402 Instrument ID Var-GC1 <br /> 005 North Wilson Way Matrix Water Prepared 12-23-OD <br /> tockton,CA 95285 Analyst Jim Phillips <br /> Tim Cuellar Analyzed 12-23-00 <br /> Reported 1-3-01 <br /> QUALITY CONTROL DATA REPORT <br /> ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> Spike Concentration 110 2 08 1 28 772 184 924 <br /> Units ug/L ug/L ug/L ug/L ug/L ug/L <br /> LCS Batch# VW-D230 VW-D230 VW-D230 VW-0230 VW-D230 VW-0230 <br /> i <br /> LCS %Recovery 104% 108% 111% 979% 985% <br /> Surrogate Recoverya a 961% <br /> 104/° 101/° 101% 101% 101% 101% <br /> '• Control Limits ° <br /> 70-130 /° 70-130% 70-130% 70-130% 70-13p°/ 70 130% <br /> ' MS/MSD Batch# VW-0230 VW-D230 VW-D230 VW-D230 VW-D230 VW-D230 <br /> Spike Concentration 110 2 08 1 28 772 1 84 924 <br /> 3 <br /> ' MS% Recovery 103% 974% 101% 982% 989%° o <br /> Surrogate Recovery ° 97 5/° <br /> 1 D3/° 102% 102% 102% 102% 102% � <br /> MSD% Recovery 1 D2% 954% 101% 961% 990% 970% <br /> ' Surrogate Recovery 102% 995% 995% <br /> 995% 995% <br /> 995% <br /> Relative% Difference 1 05% 1 95% 0 0381% 2 12% 0136% 0585% <br /> 1 <br /> Methanol Blank ND ND ND ND ND <br /> Surrogate Recovery 951% o N D <br /> 96 4/0 964% 96 4°/a 9+a 4°/a 964% <br /> ' The LCS(Laboratory Check Sample) is a control sample of known interferent free matrix that is fortified with representative <br /> es and <br /> analyzed using the same reagents preparation and analytical methods employed for the samples The LCS%recovery is used for vialdat on <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 /> ANALYST <br /> ' APPROVED BY `—— — <br /> Clan J Cone J es C Phillips <br /> nvrronmental Lab Director <br /> 1 <br /> 9 <br />