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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:01/20/2025 17:15 <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: B202413 Used client sample: N <br />Bicarbonate DUP 208.50 3.1 10214.982500656-03 mg/L 1 <br />Carbonate DUP ND 10ND2500656-03 mg/L 1 <br />Total Alkalinity as CaCO3 DUP 171.00 3.1 10176.322500656-03 mg/L 1 <br />QC Batch ID: B204369 Used client sample: N <br />Chloride DUP 61.104 0.1 1061.0652500656-03 mg/L 2 <br />MS 113.94 80 - 12061.065 50.505 1052500656-03 mg/L 3 <br />MSD 114.55 0.5 10 80 - 12061.065 50.505 1062500656-03 mg/L 4 <br />Nitrate as N DUP 6.9910 0.3 106.96802500656-03 mg/L 2 <br />MS 12.009 80 - 1206.9680 5.0505 99.82500656-03 mg/L 3 <br />MSD 12.029 0.2 10 80 - 1206.9680 5.0505 1002500656-03 mg/L 4 <br />Sulfate DUP 14.416 0.1 1014.4012500656-03 mg/L 2 <br />MS 118.27 80 - 12014.401 101.01 1032500656-03 mg/L 3 <br />MSD 119.33 0.9 10 80 - 12014.401 101.01 1042500656-03 mg/L 4 <br />QC Batch ID: B204386 Used client sample: N <br />Dissolved Calcium DUP 70.340 0.3 2070.5532500656-03 mg/L 5 <br />MS 81.087 75 - 12570.553 10.204 1032500656-03 mg/L 6 <br />MSD 80.606 0.6 20 75 - 12570.553 10.204 98.52500656-03 mg/L 7 <br />Dissolved Magnesium DUP 12.698 0.2 2012.7182500656-03 mg/L 5 <br />MS 23.426 75 - 12512.718 10.204 1052500656-03 mg/L 6 <br />MSD 23.460 0.1 20 75 - 12512.718 10.204 1052500656-03 mg/L 7 <br />Dissolved Sodium DUP 31.365 0.2 2031.3052500656-03 mg/L 5 <br />MS 42.684 75 - 12531.305 10.204 1122500656-03 mg/L 6 <br />MSD 42.545 0.3 20 75 - 12531.305 10.204 1102500656-03 mg/L 7 <br />Dissolved Potassium DUP 4.4728 0.8 204.43922500656-03 mg/L 5 <br />MS 14.946 75 - 1254.4392 10.204 1032500656-03 mg/L 6 <br />MSD 14.890 0.4 20 75 - 1254.4392 10.204 1022500656-03 mg/L 7 <br />QC Batch ID: B204465 Used client sample: N <br />Total Dissolved Solids @ 180 C DUP 809.99 1.7 10796.662500596-11 mg/L 8 <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 22 of 27Report ID: 1001564826