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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:02/13/2025 14:18 <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: B205309 Used client sample: N <br />Total Calcium DUP 43.584 1.9 2044.4282501476-08 mg/L 13 <br />MS 53.372 75 - 12544.428 10.000 89.42501476-08 mg/L 14 <br />MSD 54.626 2.3 20 75 - 12544.428 10.000 1022501476-08 mg/L 15 <br />Total Magnesium DUP 36.422 2.5 2037.3362501476-08 mg/L 13 <br />MS 46.801 75 - 12537.336 10.000 94.72501476-08 mg/L 14 <br />MSD 47.944 2.4 20 75 - 12537.336 10.000 1062501476-08 mg/L 15 <br />Run # QC Sample ID QC Type Method Prep Date <br />Run <br />Analyst Instrument DilutionDate Time <br /> 1 B202439-DUP1 DUP EPA-310.1 ELR MET-1 101/27/25 01/27/25 12:56 <br /> 2 B202440-DUP1 DUP EPA-310.1 ELR MET-1 101/27/25 01/27/25 14:33 <br /> 3 B204880-DUP1 DUP EPA-300.0 PRE IC9 201/23/25 01/23/25 22:08 <br /> 4 B204880-MS1 MS EPA-300.0 PRE IC9 2.02001/23/25 01/23/25 22:21 <br /> 5 B204880-MSD1 MSD EPA-300.0 PRE IC9 2.02001/23/25 01/23/25 22:35 <br /> 6 B204891-DUP1 DUP EPA-6010B NW1 ICP5 101/24/25 01/24/25 09:38 <br /> 7 B204891-MS1 MS EPA-6010B NW1 ICP5 1.02001/24/25 01/24/25 09:42 <br /> 8 B204891-MSD1 MSD EPA-6010B NW1 ICP5 1.02001/24/25 01/24/25 09:44 <br /> 9 B205054-DUP1 DUP EPA-160.1 IJC MANUAL 3.33301/28/25 01/28/25 14:45 <br /> 10 B205105-DUP1 DUP EPA-410.4 JMN SPEC06 101/29/25 01/29/25 07:05 <br /> 11 B205105-MS1 MS EPA-410.4 JMN SPEC06 1.17601/29/25 01/29/25 07:05 <br /> 12 B205105-MSD1 MSD EPA-410.4 JMN SPEC06 1.17601/29/25 01/29/25 07:05 <br /> 13 B205309-DUP1 DUP EPA-200.7 JEH ICP5 101/31/25 02/03/25 16:52 <br /> 14 B205309-MS1 MS EPA-200.7 JEH ICP5 101/31/25 02/03/25 16:56 <br /> 15 B205309-MSD1 MSD EPA-200.7 JEH ICP5 101/31/25 02/03/25 16:58 <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 27 of 28Report ID: 1001569791