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1534 Willow Pass Road,Pittsburg,CA 94565-1701 <br /> M c C a m p b e I l Analytical, Inc. Toll Free Telephone:(877)252-9262/Fax:(925)252-9269 <br /> "When Quality Counts" http://www.mccampbell.com/E-mail:main@mccampbell.com <br /> Quality Control Report <br /> Client: Kirkwood Meadows Public Untility District WorkOrder: 2604713 <br /> Date Prepared: 04/10/2026 BatchID: 339451 <br /> Date Analyzed: 04/13/2026 Extraction Method: SW3050 B <br /> Instrument: ICP-MS5 Analytical Method: SW6020B <br /> Matrix: Soil Unit: mg/kg <br /> Project: Kirkwood WWTP Sample ID: MB/LCS/LCSD-339451 <br /> QC Summary Report for Metals <br /> Analyte LCS LCSD SPK LCS LCSD LCS/LCSD RPD RPD <br /> Result Result Val %REC %REC Limits Limit <br /> Antimony 52.2 52.0 50 104 104 75-125 0.410 20 <br /> Arsenic 53.8 54.8 50 108 110 75-125 1.86 20 <br /> Barium 548 545 500 110 109 75-125 0.622 20 <br /> Beryllium 55.1 54.9 50 110 110 75-125 0.446 20 <br /> Cadmium 53.1 53.5 50 106 107 75-125 0.771 20 <br /> Chromium 53.3 53.8 50 107 108 75-125 0.930 20 <br /> Cobalt 56.1 54.9 50 112 110 75-125 2.08 20 <br /> Copper 54.0 54.4 50 108 109 75-125 0.812 20 <br /> Lead 57.5 57.1 50 115 114 75-125 0.613 20 <br /> Mercury 1.36 1.39 1.25 109 ill 75-125 2.40 20 <br /> Molybdenum 53.3 52.4 50 107 105 75-125 1.64 20 <br /> Nickel 53.8 55.4 50 108 ill 75-125 2.83 20 <br /> Selenium 54.2 54.4 50 108 109 75-125 0.344 20 <br /> Silver 53.1 53.0 50 106 106 75-125 0.251 20 <br /> Thallium 59.1 58.9 50 118 118 75-125 0.398 20 <br /> Vanadium 53.2 53.4 50 106 107 75-125 0.265 20 <br /> Zinc 548 553 500 110 ill 75-125 0.779 20 <br /> Surrogate Recovery <br /> Terbium 589 584 500 118 117 70-130 0.820 20 <br /> CA ELAP 1644.ORELAP(NELAP)4033 <br /> Page 26 of 36 <br />