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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:02/07/2025 16:06 <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: B205106 Used client sample: Y - Description: G-8, 01/23/2025 13:15 <br />Chemical Oxygen Demand DUP ND 206.25002501328-02 mg O2/L 12 <br />MS 889.61 80 - 1206.2500 882.35 1002501328-02 mg O2/L 13 <br />MSD 889.61 0 20 80 - 1206.2500 882.35 1002501328-02 mg O2/L 14 <br />QC Batch ID: B205191 Used client sample: N <br />Total Dissolved Solids @ 180 C DUP 1040.0 43.3 10670.00 Q012501325-01 mg/L 15 <br />Run # QC Sample ID QC Type Method Prep Date <br />Run <br />Analyst Instrument DilutionDate Time <br /> 1 B202441-DUP1 DUP EPA-310.1 ELR MET-1 101/28/25 01/28/25 09:20 <br /> 2 B202442-DUP1 DUP EPA-310.1 ELR MET-1 101/28/25 01/28/25 11:19 <br /> 3 B204959-DUP1 DUP EPA-300.0 ANN IC5 101/24/25 01/24/25 20:45 <br /> 4 B204959-MS1 MS EPA-300.0 ANN IC5 1.01001/24/25 01/24/25 21:03 <br /> 5 B204959-MSD1 MSD EPA-300.0 ANN IC5 1.01001/24/25 01/24/25 21:20 <br /> 6 B205012-DUP1 DUP EPA-6010B JRG ICP5 101/27/25 01/27/25 16:43 <br /> 7 B205012-MS1 MS EPA-6010B JRG ICP5 1.02001/27/25 01/27/25 16:47 <br /> 8 B205012-MSD1 MSD EPA-6010B JRG ICP5 1.02001/27/25 01/27/25 16:49 <br /> 9 B205105-DUP1 DUP EPA-410.4 JMN SPEC06 101/29/25 01/29/25 07:05 <br /> 10 B205105-MS1 MS EPA-410.4 JMN SPEC06 1.17601/29/25 01/29/25 07:05 <br /> 11 B205105-MSD1 MSD EPA-410.4 JMN SPEC06 1.17601/29/25 01/29/25 07:05 <br /> 12 B205106-DUP1 DUP EPA-410.4 JMN SPEC06 101/29/25 01/29/25 07:05 <br /> 13 B205106-MS1 MS EPA-410.4 JMN SPEC06 1.17601/29/25 01/29/25 07:05 <br /> 14 B205106-MSD1 MSD EPA-410.4 JMN SPEC06 1.17601/29/25 01/29/25 07:05 <br /> 15 B205191-DUP1 DUP EPA-160.1 IJC MANUAL 501/30/25 01/30/25 13:30 <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 53 of 54Report ID: 1001568851