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e ee <br /> Lancaster Laboratories <br /> Page 4 of 7 • <br /> 1®r Where quality is a science <br /> Quality Control Summary <br /> Client Name ChevronTexaco Group Number 820390 <br /> Reported 09/10/02 at 03 59 PM <br /> Sample Matrix Quality Control <br /> MS MSD MS/MSD RPD BKG DUP DUP Dup <br /> RPD <br /> AnalvsiB Name $REC %REC Limi s RPD MAX Cone Cone RPD Max <br /> bis(2-Chloroethoxy)methane 89 91 76-124 2 30 <br /> 1,2,4-Trichlorobenzene 72 73 57-108 2 30 <br /> Naphthalene 77 78 42-131 2 30 <br /> Hexachlorobutadiene 62 64 21-124 2 30 <br /> Hexachloroeyelopentadiene 54 59 5-212 9 30 <br /> 2-Chloronaphthalene 79 80 66-115 2 30 <br /> Acenaphthylene 77 80 77-111 4 30 <br /> Dimethylphthalate 63 64 2-132 1 30 <br /> 2,6-Dlnitrotoluene 82 84 41-141 3 30 <br /> Acenaphthene 80 82 58-122 3 30 <br /> 2,4-Dinitrotoluene 90 93 47-148 3 30 <br /> Fluorene 70 72 38-145 3 30 <br /> 4-Chlorophenyl-phenylether 66* 68* 69-116 3 30 <br /> Diethylphthalate 79 83 33-136 4 30 <br /> N-Nitrosodiphenylamine 82 85 67-115 3 30 <br /> 4-Bromophenyl-phenylether 81 83 74-115 3 30 <br /> Hexachlorobenzene 80 82 46-139 3 30 <br /> Phenanthrene 77 78 55-120 2 30 <br /> Anthracene 77 79 71-111 3 30 <br /> Di-n-butylphthalate 83 87 67-121 4 30 <br /> Fluoranthene 77 80 48-129 3 30 <br /> Pyrene 88 90 45-132 3 30 <br /> Butylbenzylphthalate 98 101 42-150 3 30 <br /> Benzo(a)anthracene 74* 76 75-112 2 30 <br /> Chrysene 87 88 48-132 2 30 <br /> 3,31-Dichlorobenzidine 53 57 8-125 9 30 <br /> b3.s(2-Ethylhexyl)phthalate 88 90 65-133 3 30 <br /> Di-n-octylphthalate 95 99 74-127 3 30 <br /> Benzo(b)fluoranthene 82 84 49-132 3 30 <br /> Benzo(k)fluoranthene 82 85 51-132 3 30 <br /> Benzo(a)pyrene 88 91 78-113 2 30 <br /> Indeno(1,,2,-3=cd)pyrene —88 90 77=117--2--30 -- -- ---- -- - -- - <br /> Dibenz(a,h)anthracene 94 96 57-146 2 30 <br /> Benzo(g,h,i)perylene 87 89 52-137 2 30 <br /> 2-Methylphenol 78 81 27-130 3 30 <br /> 4-Methylphenol 76 78 19-132 3 30 <br /> Benzyl alcohol 74 77 55-93 5 30 <br /> Benzoic acid 15 17 6-80 16 30 <br /> Batch number 022411848001 Sample number(s) 3886316 <br /> Cadmium 91 97 78-121 6 20 N D N D 0 (1) 20 <br /> Chromium 95 101 80-119 7 20 N D N D 0 (1) 20 <br /> Lead 94 101 75-125 8 20 N D N D 0 (1) 20 <br /> Nickel 90 98 80-117 7 20 0 0526 0 0516 2 (1) 20 <br /> Zinc 91 98 81-120 7 20 N D N D 0 (1) 20 <br /> Batch number N022413AB Sample number(s) 3886114,3686117-3886118 <br /> Methyl t-butyl ether 99 100 69-134 1 30 <br /> Benzene 108 109 78-134 0 30 <br /> Toluene 109 109 83-127 0 30 <br /> Ethylbenzene- - -107- 108 — 82-134 0 -30 <br /> Xylene (Total) 108 110 82-130 1 30 <br /> Batch number N022421AA Sample number(s) 3886115 <br /> Methyl t-butyl ether 98 98 69-134 0 30 <br /> Chloromethane 122 128 47-139 5 30 <br /> Vinyl Chloride 116 125 54-144 7 30 <br /> Bromomethane 89 90 42-134 1 30 <br /> Chloroethane 99 103 55-129 4 30 <br /> *-Outside of specification <br /> (1) The result for one or both deterrrunatlon5 was less than five times the LOQ <br /> (2) The background result was more than four times the spike added <br /> Lancaster Laboratories Inc <br /> M E M B E R 2425 New Holland Pike <br /> PO Box 12425 <br /> Lancaster PA 17605 2425 <br /> 717 656 2300 Fax 717 656 2681 2216 Rev 9/11/00 <br />