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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 Protect ID Rainwater Car Wash Method EPA 50308260 <br /> of Northern California Reference Number 4987 Instrument ID HP 5972 MS <br /> 837 Shaw Road Matnx Water Prepared 08-23-02 <br /> Stockton, CA 95215 Analyst Clan J Cone Analyzed 08-23-02 <br /> Attn Tim Cuellar Reported 09-05-02 <br /> ' QUALITY CONTROL DATA REPORT <br /> ' SPIKE ID VWMS-8232 <br /> Reporting BLANK Spiking Control %R <br /> ' Limit Result Level Spice Limits <br /> IL /L IL %RCOMPOUNDS <br /> t-But I Alcohol(t-BA) 20 ND 750 907% 41 8-168 <br /> ' <br /> Methyl t-but I ether (MTBE) 050 ND 250 888% 624-127 <br /> Diisopropyl ether{D1PE 050 ND 250 824% 51 4-151 <br /> Ethyl t-But l ether(ETRE) 050 ND 250 924% 574-138 <br /> t-Am I methyl ether TAME 050 ND 250 880% 602-122 <br /> 1 2-Dichloroethane 1,2-DCA) 050 ND 250 107% 697-124 <br /> Ethylene dxbromxde(EDB) 050 ND 250 972% 763-127 <br /> Surrogates <br /> 1,2-Dichloroethane-d4 100 852% 100 951% 529-141 <br /> ' Toluene-d8 100 110% 100 988% 764-129 <br /> Spiking MATRIX MATRIX %R %RPD <br /> Level SPIKE SPIKE DUP Limits <br /> !L %R %R <br /> COMPOUNDS <br /> t-But I Alcohol (t-BA) 750 233% 7D2% 418-168 374% <br /> ' <br /> Methyl t butyl ether (MTBE) 250 708% 760% 624-127 630% <br /> Duso ro I ether DIPS 250 860% 956% 514-151 106% <br /> Ethyl t-But I ether ETRE 250 916% 940% 574-138 2 51% <br /> t-Am l methyl ether(TAME) 250 928% 912% 602-122 174% <br /> 1,2-Dichloroethane(1 2-DCA) 250 872% 964% 697-124 973% <br /> Ethylene dibromide(EDB 250 105% 992% 763-127 549% <br /> Surrogate <br /> 1 2-Dichloroethane-d4 100 802% 774% 529-141 355% <br /> Toluene-d8 100 101% 962% -164-129 4 97% <br /> I <br /> 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 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 MSlMSD's are advisory only and are not used to accept or <br /> reject batch results <br /> 1 <br /> • ANALYST APPROVED BY <br /> Clare J Cone Jams Pullps ' <br /> L oratory Director <br />