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APTIM - Solid Waste Department <br />4171 Essen Lane <br />Baton Rouge, LA 70809 <br />Project: <br />Project Number: <br />Project Manager: <br />Foothill Landfill, SJ County <br />631038217 <br />Sandra Pimienta <br />Reported:01/22/2025 17:07 <br />Quality Control Report - Precision & Accuracy <br />Constituent Sample IDType Result Result Added Units RPD Recovery RPD Recovery Quals <br />Source Spike Percent Percent <br />Control Limits <br />Water Analysis (General Chemistry) <br />Source Lab <br />R# <br />QC Batch ID: B202418 Used client sample: N <br />Bicarbonate DUP 207.94 1.8 10204.232500743-08 mg/L 1 <br />Carbonate DUP ND 10ND2500743-08 mg/L 1 <br />Total Alkalinity as CaCO3 DUP 170.54 1.8 10167.502500743-08 mg/L 1 <br />QC Batch ID: B202419 Used client sample: Y - Description: L-2A, 01/14/2025 13:40 <br />Bicarbonate DUP 1490.2 1.4 101469.82500766-02 mg/L 2 <br />Carbonate DUP ND 10ND2500766-02 mg/L 2 <br />Total Alkalinity as CaCO3 DUP 1222.2 1.4 101205.52500766-02 mg/L 2 <br />QC Batch ID: B204442 Used client sample: N <br />Chloride DUP 21.781 0.4 1021.6842500756-01 mg/L 3 <br />MS 78.091 80 - 12021.684 50.505 1122500756-01 mg/L 4 <br />MSD 78.157 0.1 10 80 - 12021.684 50.505 1122500756-01 mg/L 5 <br />Nitrate as N DUP 19.668 1.7 1019.3352500756-01 mg/L 3 <br />MS 24.408 80 - 12019.335 5.0505 1002500756-01 mg/L 4 <br />MSD 24.467 0.2 10 80 - 12019.335 5.0505 1022500756-01 mg/L 5 <br />Sulfate DUP 46.421 0.1 1046.4512500756-01 mg/L 3 <br />MS 160.49 80 - 12046.451 101.01 1132500756-01 mg/L 4 <br />MSD 160.70 0.1 10 80 - 12046.451 101.01 1132500756-01 mg/L 5 <br />QC Batch ID: B204443 Used client sample: N <br />Chloride DUP 8.2639 0.4 108.29542500767-01 mg/L 6 <br />MS 63.885 80 - 1208.2954 50.505 1102500767-01 mg/L 7 <br />MSD 63.878 0.0 10 80 - 1208.2954 50.505 1102500767-01 mg/L 8 <br />Nitrate as N DUP 1.8598 0.0 101.85952500767-01 mg/L 6 <br />MS 7.2569 80 - 1201.8595 5.0505 1072500767-01 mg/L 7 <br />MSD 7.2460 0.2 10 80 - 1201.8595 5.0505 1072500767-01 mg/L 8 <br />Sulfate DUP 8.7589 2.3 108.56232500767-01 mg/L 6 <br />MS 119.49 80 - 1208.5623 101.01 1102500767-01 mg/L 7 <br />MSD 119.37 0.1 10 80 - 1208.5623 101.01 1102500767-01 mg/L 8 <br />QC Batch ID: B204494 Used client sample: N <br />Total Sulfide DUP ND 10ND2500656-03 mg/L 9 <br />MS 0.46511 80 - 120ND0.50000 93.02500656-03 mg/L 10 <br />MSD 0.46312 0.4 10 80 - 120ND0.50000 92.62500656-03 mg/L 11 <br />QC Batch ID: B204521 Used client sample: N <br />Total Calcium DUP 72.151 0.2 2071.9812500656-04 mg/L 12 <br />MS 79.396 75 - 12571.981 10.000 74.2 A032500656-04 mg/L 13 <br />MSD 81.626 2.8 20 75 - 12571.981 10.000 96.52500656-04 mg/L 14 <br />The results in this report apply to the samples analyzed in accordance with the chain of custody document. This analytical report must be reproduced in its entirety. <br />All results listed in this report are for the exclusive use of the submitting party. Pace Analytical assumes no responsibility for report alteration, separation, detachment or third party interpretation. <br />4100 Atlas Court Bakersfield, CA 93308 (661) 327-4911 FAX (661) 327-1918 www.pacelabs.com Page 33 of 40Report ID: 1001565394