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' CASTLE ANALYTICAL LABORATORY <br /> Environmental Testing Services 2333 Shuttle Drive,Atwater,CA 95301 Phone (209)384-2930 <br /> 1 Fax (209)384-1507 <br /> Advanced GeoEnvironmental Inc Client Project ID Pacific Car Wash Method EPA 5030/8260 <br />' of Northern California Reference Number 6242 Instrument ID HP 5972 MS <br /> 837 Shaw Road Matrix Sod Prepared 10-23-03 <br /> Stockton CA 95215 Analyst Scott Foster Analyzed 10-24-03 <br /> Attn Tim Cuellar Reported 11-07-03 <br /> 1 <br /> QUALITY CONTROL DATA REPORT <br /> SPIKE ID VSMS-0233 <br /> Reporting BLANK Spiking Control %R <br /> Limit Result Level Spike Limits <br /> m /K mg/Kg mg/Kg %R <br /> COMPOUNDS <br /> t-But I Alcohol(t-BA) 080 ND 300 112% 70-130 <br />' Meth I t-bu I ether (MTBE) 0 010 ND 0 100 888% 70-130 <br /> Dnso ro I ether DIPS 0 010 ND 0 100 732% 70-130 <br /> Ethyl t-But 1 ether(ETRE) 0 010 ND 0 100 748% 70-130 <br /> t-Am I methyd ether(TAME) 0 010 ND 0 100 836% 70-130 <br />' 1 2-Dichloroethane 1 2-DCA) 0 010 ND 0 100 119% 70-130 <br /> Ethylene dibromide EDB 0 010 ND 0 100 102% 70-130 <br /> Surrogates <br /> 1 2-Dichloroethane-14 0 010 130% 0 400 128% 70-130 <br />' Toluene-d8 0 010 102% 0 400 108% 70-130 <br /> Spiking MATRIX MATRIX %R %RPD <br />' Level SPIKE SPIKE DUP Limits <br /> mg/Kg %R %R <br /> COMPOUNDS <br />' t-But l Alcohol(t-BA) 300 105% 819% 70-130 246% <br /> Methyl t-but I ether (MTBE) 0 100 760% 708% 70-130 655% <br /> Dusopro I ether(DIPE) 0 100 624% 596% 70-130 459% <br /> Ethyl t-But I ether(ETBE) 0 100 632% 652% 70-130 312% <br />' t-Amyl methyl ether(TAME) 0 100 748% 792% 70-130 5 71% <br /> 1,2-Dichloroethane 1 2-DCA 0 100 904% 968% 70-130 684% <br /> Ethylene dibromide (EDB) 0 100 744% 792% 70-130 625% <br /> Surrogate <br />' 1 2-Dichloroethane-d4 0 400 80 0% 102% 70-130 24 6% <br /> Toluene-d8 0 400 757% 748% 70-130 1 20% <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 OC 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 APPROVED BY <br /> Clary J Cone Ja es Phillips <br /> aboratory Director <br />