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CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone (209)384-2930 <br /> Fax (209)384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Rainwater Car Wash Method EPA 5030/8260 <br /> of Northern California Reference Number 5494 Instrument ID MP 5972MS <br /> 837 Shaw Road Matrix Water Prepared 02-28-03 <br /> Stockton, CA 95215 Analyst Scott Foster Analyzed 02-28-03 <br /> Attn Tim Cuellar Reported 03-05-03 <br /> QUALITY CONTROL DATA REPORT <br /> ' SPIKE ID VWMS-2283 <br /> Reporting BLANK Spiking Control %R <br /> Limit Result Level Spike Limits <br /> ' IL L /L %R <br /> COMPOUNDS <br /> t-But l Alcohol t-BA 200 NO 750 153% 553-153 <br /> Methyl t-butyl ether MTBE 050 NO 250 109% 604-137 <br /> ' Dnso ro I ether DIPE 050 NO 250 111% 705-131 <br /> Ethyl t-But I ether ETBE 050 NO 250 113% 721 -131 <br /> t-Am I methyl ether TAME 050 NO 250 107% 717-119 <br /> 1 2-Dichloroethane(1 2-DCA) 050 NO 250 121% 636-138 <br /> Ethylene dEbromide(EDB) 050 ND 250 110% 667-129 <br /> Surrogates______ <br /> 1 2-Dichloroethane-d4 10 0 107% 100 114% 59 2-135 <br /> ' Toluene-d8 100 99 6% 10 4 978% 629-137 <br /> Spiking MATRIX MATRIX %R %RPD <br /> ' Level SPIKE SPIKE DUP Limits <br /> 1L %R %R <br /> COMPOUNDS <br /> t-But I Alcohol(t-BA) 750 124% 119% 553-153 459% <br /> ' <br /> Methyl t-but I ether MTBE 250 115% 992% 604-137 138% <br /> Duso ro I ether DIPE 250 108% 920% 705-131 160% <br /> Ethyl t-But I ether ETBE 250 112% 992% 721 -131 121% <br /> t-Am I methyl ether(TAME) 250 104% 896% 717-119 147% <br /> ' 1,2-Dichloroethane 1,2-DCA 250 124% 122% 636-138 1 58% <br /> Ethylene dibromide EDB 250 117% 108% 667-129 736% <br /> Surrogate <br /> 1,2-Dichloroethane-d4 100 120% 110% 592-135 861 <br /> ' Toluene-d8 100 917% 889% 629-132 3 10% <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 /> 3 <br /> ' ANALYST LJ APPROVED BY <br /> CIA"i Cone Jaqds—c 75hillips <br /> �Oboratory Director <br /> r <br />