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I CASTLE ANALYTICAL LABORATORY <br /> • Environmental Testing Services 2333 Shuttle Drive,Atwater, CA 95301 Phone (209)384-2930 <br />' Fax (209)384-1507 <br /> Advanced GeoE nvtron mental, Inc Client Project ID Cal Fuels(Pacific) Method EPA 5030/8260 <br />' of Northern California Reference Number 4487 Instrument ID HP 5972MS <br /> 837 Shaw Road Matrix Water Prepared 03-15-02 <br /> Stockton,CA 95215 Analyst Clan J Cone Analyzed 03-15-02 <br /> Attn Tim Cuellar Reported 03-22-02 <br /> IQUALITY CONTROL DATA REPORT ' <br /> SPIKE 1D VWMS-3152 <br /> 1 <br /> Reporting BLANK Spiking Control %R <br />' Limit Result Level Spike Limits <br /> IL IL !L %R <br /> COMPOUNDS <br /> t-Butyl Alcohol(t-BA) 200 ND 750 918% 41 8-168 <br />' <br /> Methyl t-bu I ether MTBE 050 ND 250 772% 624-127 <br /> Diiso ro i ether DIPS 050 ND 250 820% 51 4-151 <br /> Ethyl t-Butyl ether ETBE 050 ND 250 828% 574-138 <br /> t-Am I meth i ether(TAME) 050 ND 250 860% 602-122 <br />' 1 2-Dichloroethane 1,2-DCA 050 NO 250 848% 697-124 <br /> Ethylene dibromide(EDS) 050 NO 250 932% 763-127 <br /> Surrogates <br /> 1 2-Dichloroethane-d4 100 1 916% 100 904% 52 9-141 <br /> Toluene-d8 100 849% 100 956% 764-129 <br /> Spiking MATRIX MATRIX %R %RPD <br />' Level SPIKE SPIKE DUP Limits <br /> !L %R %R <br /> COMPOUNDS <br /> t-Butyl Alcohol(t-BA) 750 842% 852% 41 8-168 1 07% <br />' <br /> Methyl t-but l ether MTBE 250 828% 784% 624-127 515% <br /> Duso rop l ether(RIPE) 250 860% 868% 51 4-151 0926% <br /> Ethyl t-But I ether ETBE 250 100% 100% 574-138 0399% <br /> t-Am I methyl ether(TAME) 250 992% 940% 602-122 536% <br /> 1 2-Dichloroethane 1,2-DCA 250 884% 832% 697-124 592% <br /> Ethylene dibromide(EDB 250 118% 108% 763-127 840% <br /> Surrogate <br /> 1,2-Dichloroethane-d4 100 906% 886% 529-141 223% <br /> Toluene-d8 1 100 106% 107% 764-129 160% <br /> The LCS(Laboratory Check Sample)is a control sample of known, interferent free matrix 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 /> ANALYST APPROVED BY <br /> Clan J Cone J e hrllrps <br /> aboratory Director <br />