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' CASTLE ANALYTICAL LABORATORY <br /> s <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 5165 Instrument ID HP 5972MS <br /> 837 Shaw Road Matnx Water Prepared 10-25-02 <br /> Stockton CA 95215 Analyst Clan J Cone Analyzed 10-25-02 <br /> Attn Tim Cuellar Reported 10-31-02 <br /> QUALITY CONTROL DATA REPORT <br /> ' SPIKE ID VWMS-0252 <br /> Reporting BLANK Spiking Control %R <br /> ' Limit Result Level Spike Limits <br /> !L IL IL %R <br /> COMPOUNDS <br /> t-But I Alcohol(t-BA) 20 ND 750 825% 553-153 <br /> Methyl t-butyi ether MTBE 050 ND 250 812% 604-137 <br /> Diiso ro I ether(DIPE) 050 ND 250 856% 705-131 <br /> Ethyl t-Butyl ether ETRE 060 ND 250 876% 721 -131 <br /> t-Am I methyl ether TAME 050 ND 250 748% 717-119 <br /> ' 1,2-Dichloroethane 1,2-DCA 050 ND 250 748% 636-138 <br /> Ethylene dibromide(EDB) 050 ND 250 952% 667-129 <br /> Surrogates <br /> 1 2-Dichloroethane-I4 1 100 100% 100 95 4% 592-135 <br /> ' Toluene-d8 100 116% 1 10 0 107% 629-132 <br /> Spiking MATRIX MATRIX %R %RPD <br /> Level SPIKE SPIKE DUP Limits <br /> /L %R %R <br /> COMPOUNDS <br /> t-Bu l Alcohol(t-BA) 750 836% 91 1% 553-153 8 21% <br /> Methyl t-but I ether (MTBE) 250 820% 808% 604-137 1 23% <br /> Duso rop I ether RIPE) 250 948% 928% 705-131 192% <br /> Ethyl t-But I ether(E BE) 250 896% 872% 721 -131 2 71% <br /> t-Am I methyl ether TAME 260 748% 744% 71 7-119 0 536% <br /> 1 2-Dichloroethane 1,2-DCA 250 688% 768% 636-138 106% <br /> Ethylene dibromide EDB 250 920% 1 980% 667-129 632% <br /> Surrogate <br /> 1,2-1)ichloroethane-d4 100 86 3% 104% 592-135 <br /> Toluene-d8 100 102% 104% 1 629-132 1 213% <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 /> r <br /> ANALYST APPROVED BY <br /> ' Clan J Cone Ja Phillips i <br /> oratory Director <br /> r <br /> � � r <br /> r I I, <br />