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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.larcasterIabs.com <br /> Page 3 of 3 <br /> Quality Control Summary <br /> Client Name: Chevron Environmental Mgt. Co. Group Number: 1029183 <br /> Reported: 03/26/07 at 04:07 PM <br /> Surrogate Quality Control <br /> Blank 87 93 <br /> LCS 83 98 <br /> LCSD 82 99 <br /> Limits: 22-152 40-152 <br /> Analysis Name: BTEX+MTBE by 8260B <br /> Batch number: B070761AA <br /> Dibromofluoromethane 1,2-Dichloroethane-d4 Toluene-d8 4-Bromofluorobenzene <br /> 5004019 98 92 90 83 <br /> 5004020 98 91 89 84 <br /> 5004021 98 91 90 83 <br /> 5004022 99 89 89 83 <br /> 5004023 101 93 89 85 <br /> 5004024 101 92 88 83 <br /> 5004025 101 92 89 82 <br /> 5004026 100 90 90 83 <br /> Blank 98 94 89 84 <br /> LCS 99 95 92 88 <br /> MS 98 88 92 87 <br /> MSD 98 90 92 88 <br /> Limits: 71-114 70-109 70-123 70-111 <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 />