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' CASTLE ANALYTICAL LABORATORY <br /> ' Environmental Testing Services 2333 Shuttle Drive,Atwater CA 95301 <br /> Certificate#2079 Phone (209)384-2930 <br /> Fax (209)384-1507 <br /> Advanced GeoEnvironmental Inc Client Project ID Rainwater Car Wash <br /> ' of Northern California Method EPA 5030/8015M 8020 <br /> Reference Number 3404 Instrument l0 Var GC1 <br /> 4005 North Wilson Way Matrix Water <br /> Stockton,CA 95295 Analyst Jim Phillips Prepared 12-24-00 <br /> Attn Tim Cuellar Analyzed 12-25-00 <br /> ' Reported 1-3-01 <br /> ' QUALITY CONTROL.DATA REPORT <br /> ' ANALYTE Gasoline MTBE Benzene Toluene Ethyl Benzene Total Xylenes <br /> ' Spike Concentration 110 208 1 28 772 1 84 924 <br /> Units ug/L <br /> ug/L ug/L uglL uglL uglL <br /> ' LCS Batch# VW-D240 VW-D240 VW-0240 VW-D240 VW-0240 VW-D240 <br /> LCS %Recoveryo 1 <br /> 110/° 112% 109% 972% 98 4% 96 1% <br /> Surrogate Recovery 108% 105% ° <br /> 105/0 105% 105% 105% i <br /> ' Control Limits ° <br /> 70-130 /0 70-130% 70-130% 70-130% 70-130% 70-130 <br /> ' MS/MSO Batch# VW-D240 VW-D240 VW-D240 VW-D240 VW-D240 VW-D240 <br /> Spike Concentration 110 2 G8 1 28 772 <br /> 1 84 924 <br /> MS%Recovery 108% 0 9 <br /> Surrogate Recovery 108/° 572/0 101/° 991% 102% 100% <br /> ° ° <br /> 108/0 108% 108% 108% 108% <br /> MSD%Recovery 103% 107/107%' o Surrogate Recovery 109% 58 107%6% 95 99 % 96 8% <br /> %0 107% 107% <br /> Relative% Difference 5000/0 182% 00994% 388% 253% ° <br /> 253/0 344/0 <br /> ' Methanol Blank NO ND ND NO ND <br /> Surrogate Recovery 9940/a o 10210 o ND <br /> 102/0 102% 102% 102% <br /> FTheLCSaboratory Chec#c Sample) is a control sampleof known, interferent free matrix that is fortif the same rea ents led with representative analytes and <br /> g preparation and analytical methods employed for the samples The LCS% recovery is used for validation <br /> h 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 /> ults <br /> t � r <br /> ANALYST APPROVED BY <br /> Clan J Cone J Phillips -- <br /> nvrronmental Lab Director <br /> i <br /> A <br /> i <br />