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' CASTLE ANALYTICAL LABORATORY <br /> O <br /> Environmental Testing Seances 2333 Shuttle Drive Atwater, CA 95301 Phone (209)384-2930 <br /> Certificate#2480 Fax (209)384-1507 <br /> Advanced GeoEnvironmental, Inc Client Project ID Cal Fuels Method EPA 5030/8260 <br /> I of Northern California Reference Number 6143 Instrument ID HP 5972 MS <br /> 837 Shaw Road Matrix Water Prepared 10-01-03 <br /> Stockton, CA 95215 Analyst Scott Foster Analyzed 10-01-03 <br /> Attn Tim Cuellar Reported 10-08-03 <br /> IQUALITY CONTROL DATA REPORT <br /> SPIKE 1D VWMS-0013 <br /> Reporting BLANK Spiking Control %R <br />' Limit Result Level Spike Limits <br /> 1L IL pgJL %R <br /> COMPOUNDS <br /> t-But l Alcohol(t-BA) 20 ND 750 937% 553- 153 <br />' <br /> Methyl t-but I ether (MTBE) 050 ND 250 848% 604- 137 <br /> Ditsoprop I ether (DIES 050 ND 250 109% 705-131 <br /> Ethyl t-But I ether(ETSE) 050 ND 250 106% 72 1 -131 <br /> t-Am 1 methyl ether(TAME) 050 ND 250 104% 71 7- 119 <br /> 1 2-Dichloroethane(1,2-DCA) 050 ND 250 120% 636- 138 <br /> Ethylene dibromide(EDB) 050 ND 250 109% 667-129 <br /> Surrogates <br />� . 1 2-Dichloroethane-d4 050 921% 100 960% 592 <br /> Toluene-d8 050 917% 100 937% 629- 112 <br /> Spiking MATRIX MATRIX %R %RPD <br /> Level SPIKE SPIKE DUP Limits <br /> COMPOUNDS p /L %R %R <br /> t-But I Alcohol(t-BA) 750 102% 975% 553- 153 4 11% <br /> I <br /> Methyl t-but l ether (MTBE) 250 860% 920% 604- 137 606% <br /> Di�so ro I ether(RIPE) 2 50 108% 103% 705- 131 443% <br /> Ethyl t-But I ether(ETBE) 250 110% 976% 721 -131 116% <br /> t-Am I methyl ether TAME 250 112% 992% 717- 119 116% <br /> 1 2-Dichloroethane 1 2-DCA) 250 121% 112% 63 6-138 728% <br /> Ethylene dibromide(EDB) 250 105% 104% 667- 129 0371% <br /> Surrogate <br /> 1 2-Dichloroethane-d4 100 109% 995% 592- 135 939% <br /> IToluene-d8 100 101% 966% 1 62 9- 132 3960/- <br /> The <br /> 96%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 forthe 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 /> A <br /> ANALYST APPROVED BY <br /> Clan J Cone Jame C Phillips <br /> LatAratoiy Director <br />