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Lancaster Laboratories Analysis Report 2425 New Holland Pike,PO Box 12425,Lancaster,PA 17605-2425•717-656-2300 Fax:717-656-2681•www.lancasterlabs.com Page 1 of 3 Quality Control Summary Client Name: Chevron Environmental Mgmt Co Group Number: 1204353 Reported: 08/18/10 at 01:15 PM Matrix QC may not be reported if site-specific QC samples were not submitted. In these situations, to demonstrate precision and accuracy at a batch level, a LCS/LCSD was performed, unless otherwise specified in the method. Laboratory Compliance Quality Control Blank Blank Blank Report LCS LCSD LCS/LCSD Analysis Name Result MDL** Loo Units %REC %REC Limits RPD RPD Max Batch number: B102051AA Sample number(s) : 6039944-6039949 Benzene N.D. 0.0005 0.005 mg/kg 104 101 80-120 3 30 Ethylbenzene N.D. 0.001 0.005 mg/kg 98 94 80-120 5 30 Toluene N.D. 0.001 0.005 mg/kg 101 96 80-120 4 30 Xylene (Total) N.D. 0.001 0.005 mg/kg 98 95 80-120 3 30 Batch number: 10209SLB026 Sample number(s) : 6039944-6039949 Acenaphthene N.D. 0.00067 0.0017 mg/kg 94 73-104 Acenaphthylene N.D. 0.00033 0.0017 mg/kg 96 67-100 Anthracene N.D. 0.00033 0.0017 mg/kg 96 69-107 Benzo(a)anthracene N.D. 0.00067 0.0017 mg/kg 98 74-112 Benzo(a)pyrene N.D. 0.00067 0.0017 mg/kg 96 70-109 Benzo(b)fluoranthene N.D. 0.00067 0.0017 mg/kg 93 73-123 Benzo(g,h,i)perylene N.D. 0.00067 0.0017 mg/kg 98 62-128 Benzo(k)fluoranthene N.D. 0.00067 0.0017 mg/kg 94 65-130 Chrysene N.D. 0.00033 0.0017 mg/kg 99 79-111 Dibenz(a,h)anthracene N.D. 0.00067 0.0017 mg/kg 97 69-128 Fluoranthene N.D. 0.00067 0.0017 mg/kg 97 78-114 Fluorene N.D. 0.00067 0.0017 mg/kg 98 75-110 Indeno(1,2,3-cd)pyrene N.D. 0.00067 0.0017 mg/kg 99 71-127 1-Methylnaphthalene N.D. 0.00067 0.0017 mg/kg 103 72-114 2-Methylnaphthalene N.D. 0.00067 0.0017 mg/kg 87 62-115 Naphthalene N.D. 0.00067 0.0017 mg/kg 95 67-105 Phenanthrene N.D. 0.00067 0.0017 mg/kg 98 76-109 Pyrene N.D. 0.00067 0.0017 mg/kg 98 71-109 Batch number: 102080024A Sample number(s) : 6039944-6039949 C10-C36 N.D. 4.0 12 mg/kg Total TPH N.D. 4.0 12 mg/kg 112 72-125 Sample Matrix Quality Control Unspiked (UNSPK) = the sample used in conjunction with the matrix spike Background (BKG) = the sample used in conjunction with the duplicate MS MSD MS/MSD RPD BKG DUP DUP Dup RPD Analysis Name REC %REC Limits RPD MAX Conc Conc RPD Max Batch number: B102051AA Sample number(s) : 6039944-6039949 UNSPK: P036712 Benzene 110 55-143 Ethylbenzene 136 44-141 Toluene 142 50-146 Xylene (Total) 237* 44-136 *-Outside of specification **-This limit was used in the evaluation of the final result for the blank (1)The result for one or both determinations was less than five times the LOQ. (2)The unspiked result was more than four times the spike added.