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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 Method EPA 5030/8260 <br /> of Northern California Reference Number 5290 Instrument ID Var-GClMS <br /> 837 Shaw Road Matrix Water Prepared 12-09-02 <br /> Stockton CA 95215 Analyst Scott Foster Analyzed 12-09-02 <br /> Attn Tim Cuellar Reported 12-23-02 <br /> QUALITY CONTROL DATA REPORT <br /> SPIKE ID VWMS-D692V <br /> Reporting BLANK Spiking Control %R <br /> Limit Result Level Spike Limits <br /> !L pgIL /L %R <br /> COMPOUNDS <br /> t-Butyl Alcohol(t-BA) 20 ND 750 142% 563-153 <br /> Methyl t-bu I ether MTBE 050 ND 250 800% 604-137 <br /> Diisa ro l ether(DIPE) 050 ND 250 928% 705- 131 <br /> Ethyl t-Butyl ether ETBE 050 ND 250 900% 721 -131 <br /> t-Am E methyl ether(TAME) 050 ND 250 880% 71 7-119 <br />' 1 2-Dichloroethane 1 2-DCA 050 ND 250 812% 636-138 <br /> Ethylene dibromide(EDB) 050 ND 250 83 2% 667-129 <br /> Surro ates <br /> 1,2-Dichloroethane-d4 100 929% 100 875% 592-135 <br />' Toluene-d8 100 953% 10- 99 4% 629-132 <br /> i <br /> Spiking MATRIX MATRIX %R %RPD <br />' Level SPIKE SPIKE DUP Limits <br /> IL %R %R <br /> COMPOUNDS <br /> t-But I Alcohol(t-BA) 750 113% 111% 553-153 156% <br />' <br /> Methyl t-but l ether MTBE 250 676% 764% 604-137 113% <br /> Dusoprop l ether(DIPE 250 944% 928% 705-131 169% <br /> Ethyl t-But E ether(ETBE) 250 836% 848% 721 -131 142% <br /> t-Am I methyl ether(TAME) 250 788% 812% 71 7-119 3 00% <br />' 1 2-Dichloroethane 1,2-DCA) 250 800% 832% 636-138 376% <br /> Ethylene dibromide(EDB) 250 808% 844% 667-129 434% <br /> Surrogate <br /> 1 2-Dichloroethane-d4 100 <br /> 85 4% 8$2% 592-135 3 23% <br />' Toluene-d8 100 976% 930% 629-132 483% <br /> 1 <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 flue 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 /> 1 <br />' ANALYST ' j APPROVED BY <br /> Clan J Cone Jam hi Ips <br /> L story Director <br /> i <br />