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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 GeoEnvironmental, Inc Client Project ID Cal Fuels Method EOA 5030/8260 <br />' of Northern California Reference Number 4310 Instrument ID HP 5972MS <br /> 837 Shaw Road Matrix Water Prepared 12-31-01 <br /> Stockton,CA 95215 Analyst Clan J Cone Analyzed 12-31-01 <br /> Attn Tim Cuellar Reported 1-4-02 <br /> QUALITY CONTROL DATA REPORT <br /> SPIKE ID VWMS-0261 <br /> Reporting BLANK Spiking Control %R <br /> Limit Result Level Spike Limits <br /> IL /L p IL %R <br /> COMPOUNDS <br /> t-Bu# I Alcohol(t-$A) 20 NO _ 750 932% 70-130 <br /> Methyl t-but I ether (MTBE) 050 ND 250 996% 70-130 <br /> Dns== 1 ether(DIPS) 050 ND 250 100% 70-130 <br /> Ethyl t-Butyi ether(ETRE) 050 ND 250 968% 70-130 <br /> t-Ami methyl ether(TAME) 050 ND 250 100% 70-130 <br /> 1 2-DichlorceThane(1 2-DCA) <br /> 0-40 NO 250 101% 70-130 <br /> Ethylene dibromide(EDB) 050 NO 250 108% 70-130 <br /> surrogates <br /> 1 2-Dichloroethane-d4 10 112% 100 964% 70-1 <br /> Toluene-d8 10 I 118% 100 106% 70-1 <br /> I Spiking MATRIX MATRIX %R %RPD <br /> Level SPIKE SPIKE DUP Limits <br /> U IL %R %R <br /> COMPOUNDS <br /> t-But I Alcohol(t-BA) 750 127% 113% 70-130 11 2% <br /> Methyl t-but l ether MTBE) 250 900% 980% 70-130 656% <br /> Dusoprop i ether{DIRE) 250 924% 972% 70-130 494% <br /> Ethyl t-Butyl ether(ETBE) 2 50 380% 964% 70-130 9 11% <br /> t-Am I meth i ether(TAME) 2 50 860% 900% 70-130 415% <br /> 1 2-Dcchioroethane(1 2-DCA) 2 50 106% 112% 70-130 5 370,'0 <br /> Ethylene dibromide EDB) 250 968% 104% 70-130 665% <br /> Surrogate <br /> 1 2-0rchloroethane-o4 100 112% 110% 70-130 1 35% <br /> Toiuene-d8 100 102% 1060% 70-130 I 308% <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 ana are not used to accept or <br /> reject batch results <br /> �f <br /> ANALYST APPROVED BY <br /> Al <br /> Clan-J Cone a Ph1/11Ps <br /> 16borltory Director <br />