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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 - Method Blank Analysis <br />Constituent QC Sample ID MB Result Units Lab Quals <br />Water Analysis (General Chemistry) <br />Run #MDLPQL <br />QC Batch ID: B202458 <br />Bicarbonate B202458-BLK1 5.0NDmg/L 5.0 1 <br />Carbonate Alkalinity as CaCO3 B202458-BLK1 4.1NDmg/L 4.1 1 <br />Total Alkalinity as CaCO3 B202458-BLK1 4.1NDmg/L 4.1 1 <br />QC Batch ID: B205226 <br />Chloride B205226-BLK1 0.50NDmg/L 0.13 2 <br />Nitrate as N B205226-BLK1 0.10NDmg/L 0.024 2 <br />Sulfate B205226-BLK1 1.0NDmg/L 0.14 2 <br />QC Batch ID: B205359 <br />Total Dissolved Solids @ 180 C B205359-BLK1 6.7NDmg/L 3.3 3 <br />Run # QC Sample ID QC Type Method Prep Date <br />Run <br />Analyst Instrument DilutionDate Time <br /> 1 B202458-BLK1 PB EPA-310.1 ELR MET-1 102/04/25 02/04/25 09:00 <br /> 2 B205226-BLK1 PB EPA-300.0 ANN IC9 101/30/25 01/30/25 20:12 <br /> 3 B205359-BLK1 PB EPA-160.1 IJC MANUAL 0.66702/03/25 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 9 of 12Report ID: 1001568518