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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 717-6562681•www.lancasteriabs.com <br /> Page 1 of 3 <br /> Quality Control Summary <br /> Client Name: STANTEC-TIDEWATER Group Number: 1209952 <br /> Reported: 09/14/10 at 04:23 PM <br /> Matrix QC may not be reported if site-specific QC samples were not <br /> submitted. In these situations, to demonstrate precision and accuracy at <br /> a batch level, a LCS/LCSD was performed, unless otherwise specified in the <br /> method. <br /> Laboratory Compliance Quality Control <br /> Blank Blank Report LCS LCSD LCS/LCSD <br /> Analysis Name Result MDL Units %REC %REC Limits RPD RPD Max <br /> Batch number: A102511AA Sample number(s) : 6074280-6074282,6074287,6074289-6074290 <br /> Benzene N.D. 0.0005 mg/kg 106 80-120 <br /> C6-C12-TPH-GRO N.D. 0.044 mg/kg 148 139 71-150 7 30 <br /> Ethylbenzene N.D. 0.001 mg/kg 105 80-120 <br /> Methyl Tertiary Butyl Ether N.D. 0.0005 mg/kg 100 74-121 <br /> Toluene N.D. 0.001 mg/kg 102 80-120 <br /> Xylene (Total) N.D. 0.001 mg/kg 101 80-120 <br /> Batch number: R102531AA Sample number(s) : 6074281,6074283-6074286,6074288-6074289 <br /> Benzene N.D. 0.025 mg/kg 91 91 80-120 0 30 <br /> C6-C12-TPH-GRO N.D. 1.1 mg/kg 108 110 71-150 2 30 <br /> Ethylbenzene N.D. 0.050 mg/kg 101 99 80-120 2 30 <br /> Methyl Tertiary Butyl Ether N.D. 0.025 mg/kg 99 100 74-121 1 30 <br /> Toluene N.D. 0.050 mg/kg 100 96 80-120 2 30 <br /> Xylene (Total) N.D. 0.050 mg/kg 99 98 80-120 1 30 <br /> Batch number: R102561AA Sample number(s) : 6074286-6074287 <br /> C6-C12-TPH-GRO N.D. 1.1 mg/kg 116 117 71-150 1 30 <br /> Batch number: 102450022A Sample number(s) : 6074280-6074290 <br /> TPH-DRO soil C10-C28 microwave N.D. 4.0 mg/kg 95 76-117 <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 /> Batch number: A102511AA Sample number(s) 6074280-6074282,6074287,6074289-6074290 UNSPK: P078130 <br /> Benzene 100 107 55-143 8 30 <br /> Ethylbenzene 98 107 44-141 10 30 <br /> Methyl Tertiary Butyl Ether 86 86 55-129 0 30 <br /> Toluene 102 110 50-146 8 30 <br /> Xylene (Total) 94 102 44-136 9 30 <br /> Batch number: 102450022A Sample number(s) 6074280-6074290 UNSPK: 6074287 BKG: 6074287 <br /> TPH-DRO soil C10-C28 microwave 98 30-159 98 71 32* 20 <br /> Surrogate Quality Control <br /> *-Outside of specification <br /> (1)The result for one or both determinations was less than five times the LOQ. <br /> 0 (2)The unspiked result was more than four times the spike added. <br />