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4 <br /> -- <br /> Lancaster--- --- - --- - - - - Q h a I - s is r-Re ort - <br /> . Laboratories Y <br /> 2425 New Holland Pike Po Bax 12425 Lancaslef PA 17605-2425•717 856-2300 Fax 717-656-2681-www lancasterlabs Cont <br /> Page 7 of 7 <br /> Quality Control Summary <br /> Client Name ChevronTexaco Group Number -953420 <br /> Reported 08/10/05 at 06 22 PM <br /> - Surrogate Quality Control <br /> 4573921 94 89 91 90 <br /> Blank 92 B8 91 92 <br /> LCS 93 91 92 93 <br /> Ms 94 89 92 93 <br /> MSD 93 90 92 93 <br /> Limits 81-120 82-112 85-112 83-113 <br /> Analysts Name BTEX+MTBE by 8260B <br /> Batch number Z052151AA <br /> Dibromofluoromethane 1,2-Dichloroethane-d4 Toluene-d8 4-Bromofluorobenzene <br /> 4573920 97 102 109 93 <br /> 4573923 99 101 108 93 <br /> 4573924 98 104 109 92 <br /> 4573925 94 93 107 109 <br /> Blank 97 104 109 93 <br /> LCS 95 100 108 99 <br /> MS 97 104 IDS 99 <br /> MSD 95 98 108 99 <br /> Limits 81-120 82-112 85-112 83-113 <br /> r <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 />