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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 Cal Fuels Method EPA 5030/8260 <br /> I of Northern California Reference Number 4805 Instrument ID HP 5972MS <br /> 837 Shaw Road Matrix Water Prepared 06-27-02 <br /> Stockton CA 95215 Analyst Clan J Cone Analyzed 06-27-02 <br /> Attn Tim Cuellar Reported 07-08-02 <br /> QUALITY CONTROL DATA REPORT <br /> ISPIKE ID VVVMS-6272 <br /> Reporting BLANK Spiking Control %R <br /> Limit Result Level Spike Limits <br /> /L /L /L %R <br /> COMPOUNDS <br /> t-Butyl Alcohol(t-BA) 20 ND 750 942% 41 8-168 <br /> Methyl t-but l ether (MTBE) 050 ND 250 992% 624-127 <br /> Diiso ro I ether DIPS 050 ND 250 110% 514-151 <br /> Ethyl t-Bu I ether(ETBE) 050 ND 250 936% 574-138 <br /> t-Am l methyl ether TAME 050 ND 250 816% 602-122 <br /> 1,2-Dichloroethane 1,2-DCA 050 ND 250 102% 697-124 <br /> Ethylene dibromrde EDB 050 ND 250 102% 763-1 7 <br /> Surrogates <br /> 1 2-Dichloroethane-d4 100 110% 100 103% 529-141 <br /> Toluene-d8 100 115% 100 102% 76 4-129 <br /> Spiking MATRIX MATRIX %R %RPD <br /> Level SPIKE SPIKE DUP Limits <br /> /L %R °/v R <br /> COMPOUNDS <br /> t-Birt l Alcohol(t-BA) 750 874% 984% 41 8-168 118% <br /> Methyl t-but 1 ether MTBE 250 100% 996% 624-127 0755% <br /> Drrso ro 1 ether DIPE 250 109% 107% 51 4-151 222% <br /> Ethyl t-But I ether ETRE 250 122% 122% 674-138 0328% <br /> t-Am I methyl ether(TAME) 250 113% 119% 602-122 516% <br /> 1,2-Dichloroethane 1 2-DCA 250 988% 988% 697-124 000% <br /> Ethylene dibromrde EDB 250 126% 134% 763-127 565% <br /> Surrogate <br /> 1 2-Dichloroethane-d4 100 107% 101% 529-141 607% <br /> Toluene-d8 100 101% 101% J 764-129 0693% <br /> The LCS(Laboratory Check Sample) is a control sample of known interferent free matnx that is fortified with representative analytes and <br /> I 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 MS/MSD's are advisory only and are not used to accept or <br /> reject batch results <br /> f <br /> 1 <br /> 7 <br /> ANALYS APPROVED BY <br /> Clan J Cone Jam39 C �!l�ps <br /> L oratory Director <br />