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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 GeoEnvlronmental Inc Client Project ID rainwater Carwash Method EPA 5030!8260 <br /> ' of Northern California Reference Number 4951 Instrument ID VARIAN GC/MS <br /> 837 Shaw Road Matrix Water Prepared 08-12-02 <br /> Stockton CA 95215 Analyst Clan J Cone Analyzed 08-12-02 <br /> Attn Tim Cuellar Reported 08-21-02 <br /> ' QUALITY CONTROL DATA REPORT <br /> ' SPIKE 10 VWMS-8122 <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) 20 ND 750 105% 41 8-168 <br /> Methyl t-but I ether MTBE 050 ND 250 108% 624-127 <br /> ' Diiso ro l ether(DIPS) 050 ND 250 113% 51 4-151 <br /> Ethyl t-Butyl ether ETBE 050 ND 250 114% 574-138 <br /> t-Am I methyl ether TAME) 050 ND 250 108% 602-122 <br /> ' 1,2-Dichloroethane(1,2-DCA) 050 ND 250 104% 697-124 <br /> Ethylene dtbromide(EDB) 050 ND 250 120% 763-1 <br /> Surrogates <br /> 1 2-Dichloroethane-d4 100 842% 100 944% 529-141 <br /> Toluene-d8 100 114% 100 102% 764-179 <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) 750 191% 220% 41 B-168 438% <br /> Meth I t-but I ether (MTBE) 250 100% 968% 624-127 270% <br /> Diiso ro I ether(DIPE) 250 904% 988% 614-151 866% <br /> Ethyl t-taut I ether ETBE 250 100% 108% 574-138 729% <br /> t-Am I methyl ether TAME 250 832% 836% 602-122 0412% <br /> ' 1 2-Dichloroethane 1,2-DCA) 250 111% 131% 697-124 165% <br /> Ethylene dibromide EDB 250 111% 914% 763-127 214% <br /> Surrogate <br /> 1 2-Dichloroethane-d4 100 126% 127% 529-141 0788% <br /> Toluene-d8 100 933% 973% 76 4-129 4 20% <br /> Recoveries not calculated due to matrix interference <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 MSIMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> 1 <br /> s <br /> ' ANALYST I APPROVED BY <br /> Clary J ConeJa¢fe6s IfPhi S <br /> aboratory Director <br /> I I <br /> I <br /> I <br />