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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 />North County LF, SJ County-Groundwater <br />631038217 <br />Sandra Pimienta <br />Reported:02/06/2025 16:42 <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: B202458 Used client sample: Y - Description: G-9, 01/29/2025 13:00 <br />Bicarbonate DUP 100.16 0.2 1099.9812501560-01 mg/L 1 <br />Carbonate Alkalinity as CaCO3 DUP ND 10ND2501560-01 mg/L 1 <br />Total Alkalinity as CaCO3 DUP 82.150 0.2 1082.0002501560-01 mg/L 1 <br />QC Batch ID: B205226 Used client sample: N <br />Chloride DUP 101.97 0.3 10101.682501558-01 mg/L 2 <br />MS 371.54 80 - 120101.68 252.53 1072501558-01 mg/L 3 <br />MSD 372.72 0.3 10 80 - 120101.68 252.53 1072501558-01 mg/L 4 <br />Nitrate as N DUP ND 10ND2501558-01 mg/L 2 <br />MS 24.799 80 - 120ND25.253 98.22501558-01 mg/L 3 <br />MSD 24.868 0.3 10 80 - 120ND25.253 98.52501558-01 mg/L 4 <br />Sulfate DUP 807.62 0.0 10807.392501558-01 mg/L 2 <br />MS 1318.0 80 - 120807.39 505.05 1012501558-01 mg/L 3 <br />MSD 1318.4 0.0 10 80 - 120807.39 505.05 1012501558-01 mg/L 4 <br />QC Batch ID: B205359 Used client sample: N <br />Total Dissolved Solids @ 180 C DUP 458.00 3.6 10442.002501501-01 mg/L 5 <br />Run # QC Sample ID QC Type Method Prep Date <br />Run <br />Analyst Instrument DilutionDate Time <br /> 1 B202458-DUP1 DUP EPA-310.1 ELR MET-1 102/04/25 02/04/25 09:44 <br /> 2 B205226-DUP1 DUP EPA-300.0 OAE IC9 501/30/25 01/31/25 04:15 <br /> 3 B205226-MS1 MS EPA-300.0 OAE IC9 5.05101/30/25 01/31/25 04:28 <br /> 4 B205226-MSD1 MSD EPA-300.0 OAE IC9 5.05101/30/25 01/31/25 04:42 <br /> 5 B205359-DUP1 DUP EPA-160.1 IJC MANUAL 202/03/25 02/03/25 14:00 <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 11 of 12Report ID: 1001568518