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• 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 Geo Environmental, Inc Client Project ID Top Filling Method EPA 5030/8260 <br />' of Northern Californ,a Reference Number 4758 Instrument ID VARIAN GC/MS <br /> 837 Shaw Road Matrix Water Prepared 06-07-02 <br /> Stockton,CA 95215 Analyst Clan J Cone Analyzed 06-07-02 <br /> Attn Tim Cuellar Reported 06-17-02 <br />' QUALITY CONTROL DATA REPORT <br />' SPIKE ID VWMS-6072 <br /> Reporting BLANK Spiking Control %R <br /> Limit Result Level Spike Limits <br />' lL /L /L %R <br /> COMPOUNDS <br /> t-But I Alcohol(t-BA) 200 ND 750 142% 41 8-168 <br /> Methyl t-butyl ether MTBE 050 ND 250 105% 624-127 <br />' Diiso ro l ether DIPS 050 ND 250 109% 514-151 <br /> Ethyl t-but l ether ETRE) 050 NO 250 103% 574-138 <br /> t-Am I methyl ether(TAME 050 ND 250 868% 602-122 <br />' 1,2-Dichloroethane 1,2-DCA 050 ND 250 103% 697-124 <br /> Ethylene dibromide EDB 050 ND 250 952% 763-127 <br /> Surrogates <br /> 1,2-Dichloroethane-14 100 967% 100 101% 529-141 <br /> Toluene-d8 100 937% 100 930% 764 <br /> Spiking MATRIX MATRIX %R %RPD <br /> Level SPIKE SPIKE DUP Limits <br /> !L %R %R <br /> COMPOUNDS <br /> t-Bu# I Alcohol(t-BA) 750 125% 989% 418-168 227% <br />' <br /> Methyl t-but I ether MTBE 250 108% 976% 624-127 402% <br /> Diiso ro I ether(DIPE) 250 111% 110% 51 4151 109% <br /> Ethyl t-But I ether ETBE 250 104% 100% 574-138 4 31% <br /> t-Am I methyl ether(TAME) 250 844% 800% 602-122 530% <br />' 1,2-Dtchloroethane(1 2-DCA) 250 100% 960% 697-124 403% <br /> Ethylene dibromide(EDB) 250 952% 916% 763-127 385% <br /> ,Surrogate <br /> 1 2-❑ichloroethane-d4 100 103% 994% 529-141 307% <br /> Toluene-dB 100 965% 974% 764-129 197% <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 accept or <br /> reject batch results <br /> 1 <br /> ANALYST %4aAL. APPROVED BY <br />' Clan J Cone Jame Phillips <br /> La ratory Director <br />