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1 <br />' 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 Pacific Car Wash Method EPA 5030/8260 <br />' of Northern California Reference Number 4974 Instrument ID MP 5972 MS <br /> 837 Shaw Road Matrix Water Prepared 4 08-18-02 <br /> Stockton, CA 95215 Analyst Clan J Cone Analyzed 08-18-02 <br /> Attn Tim Cuellar Reported 08-28-02 <br /> QUALITY CONTROL DATA REPORT <br />' SPIKE ID VWMS-8182V <br /> Reporting BLANK Spiking Control %R <br />' Limit Result Level Spike Limits <br /> IL /L IL %R <br /> COMPOUNDS <br /> t-But l Alcohol(t-8A) 20 ND 750 132% 41 8-168 <br />' Meth €t-but I ether (MTBE) 050 ND 250 992% 624-127 <br /> Diisopro I ether DIPE 050 ND <br /> Ethyl t-But €ether ETBE 050 ND 2 50 108% 514-151 <br /> 50 109% 574-138 <br /> t-Am 1 methyl ether TAME 050 ND 250 106% 602-122 <br /> 1 1 2-Dichloroethane 1 2-DCA 050 ND 250 992% 697-124 <br /> Eth lene dibromide(EDB) 050 ND 250 104% 763-12 <br /> Surrogates <br /> 1,2-Dichloroethane-d4 100 109% 100 977% 52 9-141 <br /> 10 <br /> Toluene-d8 100 108% 100 104% <br /> 76-4-129 <br /> Spiking MATRIX MATRIX %R %RPD <br />' Level SPIKE SPIKE DUP Limits <br /> COMPOUNDS IL %R %R <br /> t-But I Alcohol(t-BA) 750 402% 103% 41 8-168 860% <br />' <br /> Methyl t-but l ether MTBE 250 852% 940% 624-127 259% <br /> Diiso ro I ether(DIPE) 250 114% 111% 51 4-151 285% <br /> Ethyl t-But 1 ether ETBE 250 112% 110% 574-138 144% <br /> t-Am I methyl ether TAME 250 100% 102% 602-122 117% <br />' 1 2-Dichloroethane(1,2-DCA) 250 976% 972% 697-124 0320% <br /> Ethylene dibromide EDB 250 952% 976% 763-127 248% <br /> Surro ate <br /> 1,2-Dichloroethane-d4 10 083 3% 83 2% 52 9-141 0 120% <br />' Toluene-d8 10 0 817% 842% 76 4-129 301% <br /> ' Sample concentration interfered with meaningfull spike recovery LCS result used as a quality control indicator <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 /> i <br /> I ANALYST APPROVED BY <br /> Clan J Cone Ja a Phillips <br /> boratory Director <br /> I <br />