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Page 3 of 7 <br /> Quality Control Summary <br /> Client Name Chevron Products Company Group Number 806252 <br /> Reported 05/23/02 at 11 16 AM <br /> Sample Matrix Quality Control <br /> MS MSD MS/MSD RPD BKG DUP DUH DuD <br /> RPD <br /> Analysis Name WREC %REC 74=is RPD MAX Conn Conc RPD Max <br /> Methyl t-butyl ether 101 99 69-134 2 30 <br /> ds-Isopropyl ether 104 102 68-133 1 30 <br /> Ethyl t-butyl ether 103 101 73-123 2 30 <br /> t-Amyl methyl ether 100 100 69-118 1 30 <br /> t-Butyl alcohol 106 104 51-146 2 30 <br /> Benzene 105 106 78-134 2 30 <br /> 1,2-Dichloroethane 112 104 75-141 8 30 <br /> Toluene 95 96 78-133 0 30 <br /> 1,2-Dibromoethane 88 91 78-120 3 30 <br /> Ethylbenzene 99 99 82-134 0 30 <br /> Xylene (Total) 96 98 81-136 2 30 <br /> Batch number U021262AA Sample number(s) 3814508-3814511,3814514 <br /> Ethanol 115 113 70-130 2 30 <br /> Methyl t-butyl ether (2) (2) 69-134 3 30 <br /> di-Isopropyl ether 109 108 68-133 1 30 <br /> Ethyl t-butyl ether 102 104 73-123 1 30 <br /> t-Amyl methyl ether 98 98 69-118 0 30 <br /> t-Butyl alcohol 122 122 51-148 0 30 <br /> Benzene 110 107 78-134 3 30 <br /> 1,2-Dichloroethane 115 106 75-141 6 30 <br /> Toluene 105 109 78-133 4 30 <br /> 1,2-Dibromoethane 100 100 78-120 1 30 <br /> Ethylbenzene 111 111 82-134 0 30 <br /> Xylene (Total) 109 110 51-136 1 30 <br /> Batch number U021262AB Sample number(s) 3814512-3814513,3814515-3814517 <br /> Ethanol 115 113 70-130 2 30 <br /> Methyl t-butyl ether (2) (2) 69-134 3 30 <br /> di-Isopropyl ether 109 108 68-133 1 30 <br /> Ethyl t-butyl ether 102 104 73-123 1 30 <br /> t-Amyl methyl ether 98 98 69-118 0 30 <br /> t-Butyl alcohol 122 122 51-148 0 30 <br /> Benzene 110 107 78-134 3 30 <br /> 1,2-Dichloroethane 115 106 75-141 8 30 <br /> Toluene 105 109 78-133 4 30 <br /> 1,2-Dibromoethane 100 100 78-120 1 30 <br /> Ethylbenzene 111 111 82-134 0 30 <br /> Xylene (Total) 109 110 81-136 1 30 <br /> Surrogate Quality Control <br /> Analysis Name TPH-GRO - Waters <br /> Batch number 02124A53C <br /> Trifluorotoluene-F <br /> 3814507 100 <br /> 3814508 97 <br /> 3814509 94 <br /> 3814510 98 <br /> Blank 97 <br /> LCS 107 <br /> LCSD 106 <br /> Ms 108 <br /> Limits 67-135 <br /> •-Outside of specification <br /> (1) The result for one or both determinations was less than five times the LOQ <br /> (2) The background result was more than four times the spike added <br />