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Lancaster Laboratories �4 n a I ysis Report 425 New Holland Pike PO Bax 12425 Lancaster,PA 17605-2425•717-656-2300 Fax 717-656-2681•www lancasterlabs com Page 4 of 4 Quality Control Summary Client Name ChevronTexaco Group Number 859692 Reported 07/30/03 at 03 16 PM Surrogate Quality Control Dibromofluoromethane 1,2-Dichloroethane-d4 Toluene-d8 4-Bromofluorobenzene 4083248 98 93 95 95 4083249 97 91 96 94 4083250 99 91 95 94 Blank 100 91 99 94 LCS 96 92 101 100 MS 96 90 100 101 MSD 97 92 101 101 Limits 81-120 82-112 85-112 83-113 Analysis Name BTEX+5 Oxygenates+EDC+EDB+ETOH Batch number N032061AA Dibromofluoromethane 1,2-Dachloroethane-d4 Toluene-de 4-Bromofluorobenzene 4083251 100 91 98 93 4083252 99 91 98 93 4083253 99 93 97 93 4083254 97 88 96 93 4083255 99 92 98 93 4083256 100 91 96 92 4083257 100 93 97 92 Blank 99 92 100 96 LCS 97 91 101 101 S 98 92 101 102 40 SD 96 92 100 100 Limits 81-120 82-112 85-112 83-113 Analysis Name BTEX+5 Oxygenates+EDC+EDB+ETOH Batch number W032051AB Dibromofluoromethane 1,2-D3.chloroethane-d4 Toluene-d8 4-Bromofluorobenzene 4083244 90 94 94 91 4083246 90 93 94 91 4083247 92 93 93 89 Blank 90 95 95 90 LCS 89 92 96 92 MS 92 94 96 91 MSD 90 92 95 90 Limits 81-120 82-112 85-112 83-113 Analysis Name BTEX+5 Oxygenates+EDC+EDS+ETOH Batch number W032061AB Dibromofluoromethane 1,2-Dichloroethane-d4 Toluene-d8 4-Bromofluorobenzene 4083245 86 93 95 89 Blank 85 91 95 89 LCS 91 92 96 92 MS 91 94 95 92 MSD 92 93 95 91 Limits 81-120 82-112 85-112 83-113 *- Outside of specification The result for one or both determinations was less than five times the LOQ The background result was more than four tames the spike added