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•1 ' — • A Lancaster . Laboratories Pagel of 2 Quality Control Summary Client Name: Chevron Environmental Mgt. Co. Group Number: 886333 Reported: 03/10/04 at 03:34 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 Report LCS LCSD LCs/LCSD Analysis Name Result MDL Units %REC %REC Limits RPD RPD Max Batch number: 040610001A Sample number(s) : 4224582 Total TPH N.D. 4.0 mg/kg 88 97 77-126 10 20 C10-C36 N.D. 4.0 mg/kg Batch number: 040615708001 Sample number(s) : 4224582 Cadmium N.D. 0.0540 mg/kg 98 88-106 Chromium N.D. 0.200 mg/kg 101 92-114 Lead N.D. 0.790 mg/kg 58 86-109 Nickel N.D. 0.200 mg/kg 100 89-107 ��Benzene Zinc 0.348 0.180 mg/kg 100 91-110 Batch number: 04062A31A Sample number(s): 4224582 N.D. 0.005 mg/kg 106 86-113 Toluene N.D. 0.005 mg/kg 89 88-113 Ethylbenzene N.D. 0.005 mg/kg 98 89-112 Total Xylenes N.D. 0.02 mg/kg 98 90-112 Sample Matrix Quality Control MS MSD MS/MSD RPD BRG DUP DUP Dup RPD Analysis Name %REC %REC Limits RPD MAX Conc Conc RPD Max Batch number: 040610001A Sample number(s) : 4224582 Total TPH 5.3 N.D. 200* (1) 100 C10-C36 5.3 N.D. 200* (1) 100 Batch number: 040615708001 Sample number(s) : 4224582 Cadmium 73* 73* 75-125 0 20 N.D. N.D. 0 (1) 20 Chromium 126* 121 75-125 1 20 38.5 40.0 4 20 Lead 94 95 75-125 1 20 7.16 6.75 6 (1) 20 Nickel 94 95 75-125 1 20 40.8 39.2 4 20 Zinc 96 96 75-125 0 20 50.9 49.0 4 20 Batch number: 04062A31A Sample number(s) : 4224582 Benzene 102 89 60-111 14 30 *-Outside of specification (1) The result for one or both determinations was less than five times the LOQ. (2) The background result was more than four times the spike added. Lancaster Laboratories,Inc- M E PA B E R 2425 New Holland Pike ?O Box 12425 Lancaster,?A 17605•i4Z5