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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 GeoEnviron mental, Inc Client Project ID Top Filling Method EPA 5030/8260 <br /> of Northem California Reference Number 5521 Instrument ID Varian Saturn 3 M5 <br /> 837 Shaw Road Matrix Water Prepared 03-07-03 <br /> Stockton, CA 95215 Analyst Scott Foster Analyzed 03-07-03 <br /> Attn Tim Cuellar Reported 03-18-03 <br /> QUALITY CONTROL DATA REPORT <br /> SPIKE ID VWMS-3073V <br /> Reporting BLANK Spiking Control %R <br /> Limit Result Level Spike Limits <br /> IL /L /L %R <br /> COMPOUNDS <br /> t-But I Alcohol(t-BA) . .200 ND 750 756% i 553-153 <br /> Methyl t-but 1 ether (MTBE) 050 ND 250 736% 604-137 <br /> Diiso ro I ether DIPS 0 50 ND 250 896% 705-131 <br /> Ethyl t-But I ether ETBE) 050 ND 250 908% 72 1 - 131 <br /> t-Am l methyl ether(TAME) 050 ND 250 804% 71 7-119 <br /> 1,2-Dichloroethane(1,2-DCA) 050 ND 250 788% 63 6-138 <br /> Ethylene dibromide EDB 050 ND 250 760% 667- 129 <br /> Surrogates <br /> 1,2-Dichloroethane-d4 100 840% 100 994% 592-136 <br />' Toluene-d8 100 971% 1 10 0 955% 629- <br /> Spiking <br /> 29-Spiking MATRIX MATRIX %R %RPD <br /> Level SPIKE SPIKE DUP Limits <br /> /L %R %R <br /> COMPOUNDS <br /> t-But t Alcohol t-BA 750 111% 557% 553-153 657% <br /> Methyl t-but I ether MTSE 250 988% 644% 604-137 413% <br /> Diiso ra I ether DIPS 250 824% 740% 705-131 106% <br /> Ethyl t-But I ether ETBE 250 816% 708% 721 -131 142% <br /> t-Am 1 methyl ether TAME 250 106% 652% 71 7-119 44 2% <br /> 1 2-Dichloroethane 1,2-DCA 250 118% 708% 636-138 473% <br /> Ethylene dibromide EDB 250 908% 612% 667- 129 389% <br /> Surrogate <br /> 1,2-Dichloroethane-d4 100 840% 721% 592-135 152% <br /> Toluene-d8 100 954% 101% 629-132 550% <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 MS/MSD s are advisory only and are not used to acceptor <br /> reject batch results <br /> I ANALYST APPROVED BY <br /> Clan J Cone Jam s C wwwps <br /> L oratory Director <br />