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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 5 of 5 <br /> Quality Control Summary <br /> Client Name: Chevron Environmental Mgt. Co. Group Number: 1084091 <br /> Reported: 04/15/08 at 01:17 PM <br /> Surrogate Quality Control <br /> 5318605 93 92 88 75 <br /> 5318607 92 93 88 80 <br /> 5318610 86 85 91 74 <br /> 5318611 88 85 89 73 <br /> 5318612 89 88 89 74 <br /> 5318613 89 86 89 73 <br /> 5318614 88 87 89 73 <br /> 5318615 89 84 92 76 <br /> 5318616 87 85 91 73 <br /> 5318617 88 83 90 70 <br /> 5318618 89 84 90 73 <br /> 5318619 87 86 90 74 <br /> Blank 88 88 89 75 <br /> LCS 86 86 90 81 <br /> LCSD 85 85 92 81 <br /> MS 85 85 95 82 <br /> Limits: 71-114 70-109 70-123 70-111 <br /> Analysis Name: BTEX+MTBE by 8260B <br /> Batch number: Q080941AA <br /> Dibromofluoromethane 1,2-Dichloroethane-d4 Toluene-d8 4-Bromofluorobenzene <br /> 5318601 84 82 85 77 <br /> 5318602 81 79 94 70 <br /> 5318603 79 79 83 70 <br /> 5318604 80 77 74 88 <br /> 5318606 85 84 73 77 <br /> 5318608 79 75 73 80 <br /> 5318609 80 78 73 98 <br /> Blank 109 106 102 98 <br /> LCS 103 100 97 93 <br /> MS 94 91 86 91 <br /> MSD 91 90 104 89 <br /> Limits: 71-114 70-109 70-123 70-111 <br /> *-Outside of specification <br /> **-This limit was used in the evaluation of the final result for the blank <br /> (1)The result for one or both determinations was less than five times the LOQ. <br /> (2)The unspiked result was more than four times the spike added. <br />