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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.larcasterIabs.com Page 1 of 3 Quality Control Summary Client Name: Chevron Environmental Mgt. Co. Group Number: 1121307 Reported: 12/09/08 at 03:18 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: 083310027A Sample number(s) : 5536923-5536924 Total TPH N.D. 4.0 12 mg/kg 95 97 66-113 2 20 C10-C36 N.D. 4.0 12 mg/kg Batch number: 08336SLB026 Sample number(s) : 5536923-5536924 Naphthalene N.D. 0.00067 0.0017 mg/kg 79 67-105 Acenaphthylene N.D. 0.00033 0.0017 mg/kg 90 67-100 Acenaphthene N.D. 0.00067 0.0017 mg/kg 86 73-104 Fluorene N.D. 0.00067 0.0017 mg/kg 92 75-110 Phenanthrene N.D. 0.00067 0.0017 mg/kg 90 76-109 Anthracene N.D. 0.00033 0.0017 mg/kg 90 70-103 Fluoranthene N.D. 0.00067 0.0017 mg/kg 90 78-114 Pyrene N.D. 0.00067 0.0017 mg/kg 85 69-116 Benzo(a)anthracene N.D. 0.00067 0.0017 mg/kg 89 74-112 Chrysene N.D. 0.00033 0.0017 mg/kg 92 79-111 Benzo(b)fluoranthene N.D. 0.00067 0.0017 mg/kg 94 70-125 Benzo(k)fluoranthene N.D. 0.00067 0.0017 mg/kg 99 72-124 Benzo(a)pyrene N.D. 0.00067 0.0017 mg/kg 88 70-109 Indeno(1,2,3-cd)pyrene N.D. 0.00067 0.0017 mg/kg 97 64-127 Dibenz(a,h)anthracene N.D. 0.00067 0.0017 mg/kg 100 63-138 Benzo(g,h,i)perylene N.D. 0.00067 0.0017 mg/kg 91 58-131 Batch number: Q083381AA Sample number(s) : 5536924 Benzene N.D. 0.025 0.25 mg/kg 97 84-115 Toluene N.D. 0.050 0.25 mg/kg 100 81-116 Ethylbenzene N.D. 0.050 0.25 mg/kg 101 82-115 Xylene (Total) N.D. 0.050 0.25 mg/kg 102 82-117 Batch number: X083382AA Sample number(s) : 5536923 Benzene N.D. 0.0005 0.005 mg/kg 111 108 84-115 3 30 Toluene N.D. 0.001 0.005 mg/kg 110 105 81-116 4 30 Ethylbenzene N.D. 0.001 0.005 mg/kg 111 107 82-115 3 30 Xylene (Total) N.D. 0.001 0.005 mg/kg 106 103 82-117 4 30 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: 08336SLB026 Sample number(s) : 5536923-5536924 UNSPK: P539393 Naphthalene 44 107 27-145 16 30 *-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.