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Quality Control Report <br />McCampbell Analytical, Inc.1534 Willow Pass Road, Pittsburg, CA 94565-1701 <br />Toll Free Telephone: (877) 252-9262 / Fax: (925) 252-9269 <br />http://www.mccampbell.com / E-mail: main@mccampbell.com"When Quality Counts" <br />Client:Soil Control Lab <br />Project:5070417-01; Central Valley Compost (WM- <br />Lathrop)(Altamont) <br />Date Analyzed:08/11/2025 <br />Date Prepared:08/08/2025 <br />WorkOrder:2508406 <br />BatchID:323199 <br />Analytical Method:SW6020 <br />Unit:mg/kg <br />Sample ID:MB/LCS/LCSD-323199 <br />Instrument:ICP-MS5 <br />Matrix:Soil <br />Extraction Method:SW3050 B <br />QC Summary Report for Metals <br />Analyte MB <br />Result <br />MDL RL SPK <br />Val <br />MB IS/SS <br />%REC <br />MB IS/SS <br />Limits <br />Arsenic ND 0.10 0.50 --- <br />Cadmium ND 0.073 0.50 --- <br />Chromium ND 0.14 0.50 --- <br />Copper ND 0.15 0.50 --- <br />Lead ND 0.11 0.50 --- <br />Mercury ND 0.040 0.050 --- <br />Molybdenum ND 0.089 0.50 --- <br />Nickel ND 0.25 0.50 --- <br />Selenium ND 0.20 0.50 --- <br />Zinc ND 1.5 5.0 --- <br />Surrogate Recovery <br />Terbium 550 500 110 70-130 <br />Analyte LCS <br />Result <br />LCSD <br />Result <br />SPK <br />Val <br />LCS <br />%REC <br />LCSD <br />%REC <br />LCS/LCSD <br />Limits <br />RPD RPD <br />Limit <br />Arsenic 54 57 50 107 114 75-125 5.60 20 <br />Cadmium 52 55 50 105 110 75-125 5.33 20 <br />Chromium 54 58 50 108 117 75-125 7.85 20 <br />Copper 54 57 50 108 114 75-125 5.61 20 <br />Lead 53 56 50 106 112 75-125 5.44 20 <br />Mercury 1.3 1.4 1.25 106 113 75-125 6.58 20 <br />Molybdenum 53 57 50 107 114 75-125 6.37 20 <br />Nickel 54 58 50 109 116 75-125 6.44 20 <br />Selenium 55 56 50 109 112 75-125 2.55 20 <br />Zinc 540 580 500 109 115 75-125 5.82 20 <br />Surrogate Recovery <br />Terbium 560 580 500 113 115 70-130 2.36 20 <br />CA ELAP 1644 • ORELAP (NELAP) 4033 <br />Page 5 of 11