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cbCurtis&Tompkins, Ltd. <br /> Analytical Laboratories,Since 1878 <br /> Batch QC Report <br /> California Title 26 Metals <br /> Lab #: 187700 Location: Bridgestone/Firestone Metal Shavings <br /> Client: MWH Prep: EPA 3010A <br /> Project#: 4050530.010101 Analysis: EPA 6010B <br /> Field ID: NEWARK Diln Fac: 10.00 <br /> Type: SSPIKE Batch#: 114939 <br /> MSS Lab ID: 187700-001 Sampled: 06/28/06 <br /> Lab ID: QC346089 Received: 06/28/06 <br /> Matrix: TCLP Leachate Prepared: 07/03/06 <br /> Units: ug/L Analyzed: 07/03/06 <br /> Analyte MSS Result Spiked Result %REC Limits ' <br /> Antimony 107.9 2,000 2, 021 96 70-121 <br /> Arsenic <8.008 1,000 932.6 93 76-129 <br /> Barium 1,364 2,000 3,257 95 78-120 <br /> Beryllium <6.761 50.00 47.66 95 80-120 <br /> Cadmium <16.77 200.0 207.4 104 80-120 <br /> Chromium <17.53 2,000 1, 902 95 80-120 <br /> Cobalt <15.05 500.0 456.8 91 80-120 <br /> Copper <20.12 250.0 121.7 49 * 79-120 <br /> Lead <4.605 2,000 1, 973 99 70-120 <br /> Molybdenum <16.40 400.0 374.4 94 71-120 <br /> Nickel <20.44 500.0 443.9 89 77-120 <br /> Selenium 40.84 1,000 1,012 97 73-132 <br /> Silver <11.69 200.0 188.7 94 73-121 <br /> Thallium <16.33 1,000 876.0 88 65-120 <br /> Vanadium <15.00 500.0 498.7 100 80-120 <br /> Zinc <76.51 500.0 475.7 95 74-123 <br /> *= Value outside of QC limits; see narrative <br /> Page 1 of 1 27.0 <br />