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Lancaster <br />Laboratories <br />Quality Control Summary <br />'A <br />Client Name ChevronTexaco Group Number 832605 <br />Reported 12/12/02 at 11 42 AM <br />nalysis Name +k.RBC RSC Limi,�s 29nC Cone <br />Batch number 02333A53A Sample number(s) 3950561-3950566 <br />TPH-GRO - Waters 112 74-132 <br />Batch number 023360041A <br />Methanol (by Direct Injection) <br />Batch number N023341AB <br />Ethanol <br />Methyl t -butyl ether <br />di -Isopropyl ether <br />Ethyl t -butyl ether <br />t -Amyl methyl ether <br />t -Butyl alcohol <br />Benzene <br />1,2-Dichloroethane <br />Toluene <br />1,2-Dibromoethane <br />Ethylbenzene <br />Xylene (Total) <br />Batch number N023361AA <br />Ethanol <br />Methyl t -butyl ether <br />di -Isopropyl ether <br />0hyl t -butyl ether <br />Amyl methyl ether <br />Butyl alcohol <br />Benzene <br />1,2-Dichloroethane <br />Toluene <br />1,2-Dibromoethane <br />Ethylbenzene <br />Xylene (Total) <br />Sample number(s) 3950561-3950565 <br />100 96 69-127 4 20 <br />Sample number(s) 3950565-3950566 <br />100 <br />99 <br />34-163 <br />1 <br />30 <br />99 <br />100 <br />69-134 <br />1 <br />30 <br />109 <br />111 <br />68-133 <br />2 <br />30 <br />86 <br />89 <br />73-123 <br />4 <br />30 <br />85 <br />87 <br />69-118 <br />3 <br />30 <br />89 <br />89 <br />51-148 <br />1 <br />30 <br />109 <br />110 <br />78-134 <br />1 <br />30 <br />109 <br />110 <br />73-136 <br />0 <br />30 <br />111 <br />113 <br />83-127 <br />2 <br />30 <br />91 <br />93 <br />78-120 <br />3 <br />30 <br />112 <br />112 <br />82-134 <br />0 <br />30 <br />110 <br />112 <br />82-130 <br />1 <br />30 <br />Sample number(s) 3950562-3950564 <br />93 <br />95 <br />34-163 <br />3 <br />30 <br />100 <br />101 <br />69-134 <br />1 <br />30 <br />107 <br />109 <br />68-133 <br />2 <br />30 <br />95 <br />98 <br />73-123 <br />3 <br />30 <br />91 <br />93 <br />69-118 <br />2 <br />30 <br />85 <br />86 <br />51-148 <br />1 <br />30 <br />107 <br />109 <br />78-134 <br />2 <br />30 <br />100 <br />102 <br />73-136 <br />2 <br />30 <br />109 <br />111 <br />83-127 <br />2 <br />30 <br />90 <br />90 <br />78-120 <br />0 <br />30 <br />110 <br />111 <br />82-134 <br />1 <br />30 <br />109 <br />111 <br />82-130 <br />2 <br />30 <br />Batch number N023361AB <br />Sample <br />number(s) 3950561 <br />Ethanol <br />93 <br />95 <br />34-163 <br />3 30 <br />Methyl t -butyl ether <br />100 <br />101 <br />69-134 <br />1 30 <br />di -Isopropyl ether <br />107 <br />109 <br />68-133 <br />2 30 <br />Ethyl t -butyl ether <br />95 <br />98 <br />73-123 <br />3 30 <br />t -Amyl methyl ether <br />91 <br />93 <br />69-118 <br />2 30 <br />t -Butyl alcohol <br />85 <br />86 <br />51-148 <br />1 30 <br />Benzene <br />107 <br />109 <br />78-134 <br />2 30 <br />1,2-Dichloroethane <br />100 <br />102 <br />73-136 <br />2 30 <br />Toluene <br />109 <br />111 <br />83-127 <br />2 30 <br />1,2-Dibromoethane <br />90 <br />90 <br />78-120 <br />0 30 <br />Ethylbenzene <br />110 <br />111 <br />82-134 <br />1 30 <br />Xylene (Total) <br />109 <br />111 <br />82-130 <br />2 30 <br />Surrogate Quality Control <br />Analysis Name TPH-GRO - Waters <br />Batch number 02333A53A <br />Trifluorotoluene-F <br />0561 99 <br />�- Outside of specification <br />The result for one or both determinations was less than five times the LOQ <br />The background result was more than four times the spike added <br />Lancaster Laboratories, Inc <br />M E M B R 2425 New Holland Pike <br />PO Box 12425 <br />VA 1. MLancaster, 00 PA1760s-2425 <br />717-656-2300 Fax 717.67-6 <br />56-2689 <br />Page 2 of 4. <br />$IPP <br />2216 Rev 10/2/02 <br />Max <br />