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Lancaster <br /> Laboratories Analysis Report <br /> 2425 New Holland Pike,PO Box 12425,Lancaster,PA 17605-2425•717-656-2300 Fax:717-656-2681•www.lancasterlabs.com <br /> Page 5 of 5 <br /> Quality Control Summary <br /> Client Name: Chevron Environmental Mgt. Co. Group Number: 944279 <br /> Reported: 06/14/05 at 05:33 PM <br /> Surrogate Quality Control <br /> 4528319 93 <br /> 4528320 88 <br /> 4528321 92 <br /> Blank 89 99 <br /> LCS 94 111 <br /> MS 74 84 <br /> MSD 68 86 <br /> Limits: 61-122 63-126 <br /> Analysis Name: BTEX by 8260B <br /> Batch number: Z051472AA <br /> Dibromofluoromethane 1,2-Dichloroethane-d4 Toluene-d8 4-Bromofluorobenzene <br /> 4528314 93 95 98 93 <br /> 4528316 92 96 99 94 <br /> 4528317 92 95 98 92 <br /> Blank 93 94 99 93 <br /> LCS 92 94 98 95 <br /> MS 92 95 98 97 <br /> MSD 92 95 98 97 <br /> Limits: 81-120 82-112 85-112 83-113 <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 />