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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:5070102-01; Central Valley Compost (WM- <br />Lathrop) (Altamont) <br />Date Analyzed:07/18/2025 <br />Date Prepared:07/18/2025 <br />WorkOrder:2507A84 <br />BatchID:321663 <br />Analytical Method:SW6020 <br />Unit:mg/kg <br />Sample ID:MB/LCS/LCSD-321663 <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 53 50 50 107 101 75-125 5.78 20 <br />Cadmium 51 49 50 102 97 75-125 4.83 20 <br />Chromium 52 50 50 104 100 75-125 4.53 20 <br />Copper 53 50 50 107 100 75-125 6.13 20 <br />Lead 49 48 50 99 95 75-125 3.70 20 <br />Mercury 1.2 1.2 1.25 98 96 75-125 1.73 20 <br />Molybdenum 50 48 50 99 95 75-125 4.38 20 <br />Nickel 53 51 50 107 102 75-125 5.02 20 <br />Selenium 54 51 50 108 102 75-125 5.06 20 <br />Zinc 530 500 500 105 100 75-125 5.23 20 <br />Surrogate Recovery <br />Terbium 530 520 500 106 103 70-130 3.27 20 <br />CA ELAP 1644 • ORELAP (NELAP) 4033 <br />Page 5 of 11