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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 2 of 3 <br /> Quality Control Summary <br /> Client Name: Chevron Environmental Mgt. Co. Group Number: 988449 <br /> Reported: 05/17/06 at 01:23 PM <br /> Sample Matrix Quality Control <br /> Unspiked (UNSPK) = the sample used in conjunction with the matrix spike <br /> Background (BKG) = the sample used in conjunction with the duplicate <br /> MS MSD MS/MSD RPD BKG DUP DUP Dup RPD <br /> Analysis Name %REC %REC Limits RPD MAX Conc Conc RPD Max <br /> TPH-DRO (C10-C25) Water 103 78 59-128 26* 20 <br /> Batch number: 06128A54A Sample number(s) : 4765526-4765529 UNSPK: P765560 <br /> TPH-GRO - Waters 115 115 63-154 0 30 <br /> Benzene 100 101 78-131 0 20 <br /> Toluene 103 103 78-129 0 30 <br /> Ethylbenzene 106 105 75-133 1 30 <br /> Total Xylenes 105 104 84-131 1 30 <br /> Batch number: 06129A56A Sample number(s) : 4765525 UNSPK: P763815 <br /> Benzene 111 109 78-131 2 20 <br /> Toluene 114 112 78-129 1 30 <br /> Ethylbenzene 116 116 75-133 0 30 <br /> Total Xylenes 116 116 84-131 0 30 <br /> Surrogate Quality Control <br /> Surrogate recoveries which are outside of the QC window are confirmed <br /> unless attributed to dilution or otherwise noted on the Analysis Report. <br /> Analysis Name: TPH-DRO (C10-C25) Water <br /> Batch number: 061260013A <br /> Orthoterphenyl <br /> 4765526 87 <br /> 4765527 88 <br /> 4765528 97 <br /> 4765529 81 <br /> Blank 88 <br /> LCS 98 <br /> MS 110 <br /> MSD 100 <br /> Limits: 59-131 <br /> Analysis Name: BTEX <br /> Batch number: 06128A54A <br /> Trifluorotoluene-F Trifluorotoluene-P <br /> 4765526 97 97 <br /> 4765527 96 97 <br /> 4765528 96 96 <br /> 4765529 97 97 <br /> Blank 94 96 <br /> LCS 102 97 <br /> LCSD 103 96 <br /> MS 102 97 <br /> MSD 102 97 <br /> Limits: 63-135 69-129 <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 />