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I <br />' 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 Top Filling Station Method EPA 5030/8260 <br />' of Northern California Reference Number 5793 Instrument ID HP 5972 MS <br /> 837 Shaw Road Matrix Water Prepared 06-13-03 <br /> Stockton, CA 95215 Analyst Scott Faster Analyzed 06-13-03 <br /> Attn Tim Cuellar Reported 063-18-03 <br /> I <br /> QUALITY CONTROL DATA REPORT <br />' SPIKE ID VWMS-6133 <br /> Reporting BLANK Spiking Control %R <br /> Limit Result Level Spike Limits <br /> R /L /L %R <br /> COMPOUNDS <br /> t-But l Alcohol(t-BA) 20 ND 750 948% 553-153 <br /> I <br /> Methyl t-butyl ether (MTBE) 050 ND 250 736% 604-137 <br /> Dusopro l ether(DIPE) 050 ND 260 700% 705-131 <br /> Ethyl t-But l ether(ETBE) 060 ND 250 740% 721 -131 <br /> t-Am I methyl ether TAME 050 ND 250 816% 71 7-119 <br />' 1 2-Dichloroethane(1 2-DCA) 050 ND 250 102% 636-138 <br /> Ethylene dibromide(EDB) 050 ND 250 796% 667- 129 <br /> Surrogates <br /> 1,2-Dichloroethane-d4 1 100 996% 100 106% 592-135 <br /> Toluene-d8 100 944% 100 896% 629-132 <br /> Spiking MATRIX MATRIX %R %RPD <br /> Level SPIKE SPIKE DUP Limits <br /> p IL %R %R <br /> COMPOUNDS <br /> t-But I Alcohol(t-BA) 750 958% 114% 553-153 171% <br /> Methyl t-but I ether (MTBE) 250 712% 796% 604-137 107% <br /> Dusopro I ether(DIPE) 250 728% 776% 705-131 638% <br /> Ethyl t-Sul l ether(ETBE) 250 828% 864% 721 -131 426% <br /> t-Am I methyl ether(TAME) 250 764% 808% 717-119 475% <br /> I 1,2-Dichloroethane 1 2-DCA) 250 928% 103% 636- 138 963% <br /> Ethylene dibromide(EDB) 250 752% 860% 667- 129 134% <br /> Surro ate <br /> 1 2-01chloroethane-d4 100 894% 997% 592-135 10 9% <br /> IToluene-d8 100 945% 629-132 2 14% <br /> I <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 /> I ANALYST APPROVED BY <br /> Clan J ConeJ s C Phillips <br /> Laboratory arrector <br /> I <br />