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Lancaster Laboratories Page 1 of 2 <br /> Where qua"Iyt,,a science <br /> Quality Control Summary <br /> Client Name ChevronTexaco Group Number 808116 <br /> Reported 05/29/02 at 02 28 PM <br /> Laboratory Compliance Quality Control <br /> Blank Blank Report LCS LCSD LCS/LCSD <br /> Analysis Name Result MDL Units %REC %REC Limits RPD RPD Max <br /> Batch number 0214OA53A Sample number(s) 3822483 <br /> Benzene N D 0 5 ug/1 110 114 80-118 3 30 <br /> Toluene N D 0 5 ug/l 110 115 82-119 4 30 <br /> Ethylbenzene N D 0 5 ug/l 112 117 81-119 4 30 <br /> total Xylenes N D 1 5 ug/l 110 115 82-120 4 30 <br /> Methyl tent-Butyl Ether N D 2 5 ug/l 116 117 79-127 1 30 <br /> TPH-GRO - Waters N D 50 ug/l 105 112 76-126 6 30 <br /> Batch number 02140B56A Sample number(s) 3822484 <br /> Benzene N D 0 5 ug/l 112 113 80-118 1 30 <br /> Toluene N D 0 5 ug/l 114 114 82-119 0 30 <br /> Ethylbenzene N D 0 5 ug/1 115 115 81-119 0 30 <br /> Total Xylenes N D 1 5 ug/l 115 115 82-120 0 30 <br /> Methyl tert-Butyl Ether N D 2 5 ug/l 105 106 79-127 1 30 <br /> TPH-GRO - Waters N D 50 ug/l 115 99 76-126 14 30 <br /> Batch number V021361AC Sample number(s) 3822484 <br /> Ethanol N D 500 ug/1 95 44-139 <br /> Methyl t-butyl ether N D 2 ug/l 100 77-127 <br /> di-Isopropyl ether N D 2 ug/l 96 74-125 <br /> Ethyl t-butyl ether N D 2 ug/l 100 74-120 <br /> t-Amyl methyl ether N D 2 ug/l 102 71-114 <br /> t-Butyl alcohol N D 100 ug/1 108 59-139 <br /> Sample Matrix Quality Control • <br /> MS MSD MS/MSD RPD BKG DUP DUP Dup <br /> RPD <br /> Analysis Name %REC %REC Limits RPD MAIC Conc Conc RPD Max <br /> i <br /> Batch number 0214OA53A Sample number(s) 3822483 j <br /> Benzene 117 77-131 <br /> Toluene 117 80-128 <br /> Ethylbenzene 119 76-132 <br /> Total Xylenes 117 76-132 <br /> Methyl tert-Butyl Ether 120 61-144 <br /> TPH-GRO - Waters 114 74-132 <br /> Batch number 0214OB56A Sample number(s) 3822484 <br /> Benzene 114 77-131 <br /> Toluene 117 80-12B <br /> Ethylbenzene 118 76-132 <br /> Total Xylenes 118 76-132 <br /> Methyl tert-Butyl Ether 105 61-144 <br /> TPH-GRO - Waters 114 74-132 <br /> Batch number V021361AC Sample number(s) 3822484 <br /> Ethanol 64• 81 70-130 24 30 <br /> Methyl t-butyl ether 95 97 69-134 2 30 <br /> dx-Isopropyl ether 99 96 68-133 2 30 <br /> Ethyl t-butyl ether 97 96 73-123 1 30 <br /> t-Amyl methyl ether 105 102 69-118 2 30 <br /> t-Butyl alcohol 107 110 51-148 3 30 <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 /> Lancaster Laboratone5 Inc <br /> MEMBER 2425 New Holland Pike <br /> PO Box 12425 <br /> Lancaster PA 17605 2425 <br /> 717 656 2300 Fax 717-656 2681 2216 Rev 5111100 <br /> / <br />