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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 GeoEnvironmental, Inc Client Project ID Rainwater Car Wash Method EPA 5030/8260 <br /> of Northern California Reference Number 5103 Instrument ID HP 5972 MS <br /> 837 Shaw Road Matrix Water - Prepared 09-30-02 <br /> Stockton CA 95215 Analyst Clan J Cone Analyzed 09-30-02 <br /> Attn Tim Cuellar Reported 10-10-02 <br /> ' QUALITY CONTROL DATA REPORT <br /> ' SPIKE ID VWMS-9302 <br /> Reporting BLANK Spiking Control %R <br /> ' Limit Result Level Spike Limits <br /> IL 1L IL %R <br /> COMPOUNDS <br /> t-But l Alcohol(t-BA) 20 ND 750 876% 41 8-168 <br /> ' <br /> Methyl t-but I ether MTBE 050 NO 250 852% 62 4-127 <br /> Diisgropyl ether(DIPE) 050 ND 250 960% 514-151 <br /> Ethyl t-But l ether ETBE 050 ND 250 956% 574-138 <br /> t-Am I methyl ether TAME 050 ND 250 84 B% 602-122 <br /> ' 1 2-Dichloroethane 1,2-DCA) 050 ND 250 828% 697-124 <br /> Ethylene dibromide EDB 050 ND 250 892% 763-127 <br /> Surrogates <br /> 1 2-Dichloroethane-d4 100 81 2% 100 872% 52 9-149 <br /> ' Toluene-d8 100 956% 100 963% 76 4-129 <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) 750 150% 144% 418-168 1 11% <br /> Methyl t-butyl ether (MTBE) 250 976% 832% 624-127 142% <br /> Dirsa ro I ether(DIPE 250 102% 920% 514-151 102% <br /> Ethyl t-Butyl ether(ETBE) 250 100% 864% 574-138 150% <br /> t-Am I methyl ether(TAME) 250 800% 688% 602-122 136% <br /> ' 1 2-Dichloroethane 1 2-DCA 250 852% 864% 697-124 137% <br /> Ethylene drbromide EDB 250 992% 892% 763-127 106% <br /> Surrogate <br /> 1 2-Dichloroethane-d4 100 841% 876% 529-141 408% <br /> tToluene-d8 10 0 995% 940% 764-129 5 68% <br /> The LCS(Laboratory Check Sample) is a contral 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 recovenes for MSINISD's are advisory only and are not used to accept or <br /> reject batch results <br /> s <br /> 1 . <br /> ANALYST APPROVED BY <br /> ' Clan J Cone Jam fill l <br /> La rafory Director <br /> 1 � <br />