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' 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 5030/8260 <br /> ' of Northern California Reference Number 7092(21-24) Instrument ID HP 5972 MS <br /> 837 Shaw Road Sample Description Water Prepared 06-26-04 <br /> Stockton CA 95215 Analyst Scott Foster Analyzed 06-26-04 <br /> Attn Tim Cuellar Reported 07-07-04 <br /> QUALITY CONTROL DATA REPORT <br /> ' SPIKE I❑ VWMS-6264 <br /> Reporting BLANK Spiking Control %R <br /> ' Limit Result Level Spike Limits <br /> N It /L p /L %R <br /> COMPOUNDS <br /> t-But I Alcohol (t-BA) 20 ND 750 674% 553-153 <br /> ' <br /> Methyl t-but I ether (MTBE) 050 ND 250 103% 604-137 <br /> Dusoprop I ether(DIPE) 050 ND 250 104% 705-131 <br /> Ethyl t-But I ether(ETRE) 050 ND 250 944% 721 -131 <br /> t Ami methyl ether(TAME) 050 ND 250 100% 71 7-119 <br /> ' 1 2-Dichloroethane 1 2-DCA) 050 ND 250 904% 636-138 <br /> Ethylene dibromide(EDB) 050 ND 250 103% 667-129 <br /> Surrogates <br /> 1 2-03chloroethane-d4 1 0 897% 100 902% 592-135 <br /> ' Toluene-d8 1 0 102% 100 100% 62 9-132 <br /> Spiking MATRIX MATRIX %R %RPD <br /> ' Level SPIKE SPIKE DUP Limits <br /> /L %R %R <br /> COMPOUNDS <br /> t Butyl Alcohol(t-BA) 760 654% 556% 553- 153 159% <br /> ' <br /> Methy1 t-but I ether (MTBE) 250 940% 900% 604- 137 400% <br /> Diiso ro I ether(DIPE) 250 100% 102% 705-131 236% <br /> Ethyl t-But t ether(ETBE) 250 960% 956% 721 -131 0416% <br /> t-Am I methyl ether(TAME) 260 876% 904% 71 7-119 2 85% <br /> 1 2-Dichloroethane(1 2-DCA) 250 960% 992% 636-138 324% <br /> Ethylene dibromide(EDB) 250 996% 104% 667-129 471% <br /> Surro ate <br /> 1 2-Dichloroethane-d4 100 936% 91 6% 592- 135 2 16% <br /> ' Toluene-d8 100 104% 110% 629- 132 495% <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 MSlMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> 1 <br /> ' ANALYST qLr�� APPROVED BY <br /> Clan J Cone JanAm Phillips <br /> L oratory Director <br /> I <br />