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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 - 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: B202439 <br />Bicarbonate B202439-BLK1 5.0NDmg/L 5.0 1 <br />Carbonate Alkalinity as CaCO3 B202439-BLK1 4.1NDmg/L 4.1 1 <br />Total Alkalinity as CaCO3 B202439-BLK1 4.1NDmg/L 4.1 1 <br />QC Batch ID: B202440 <br />Bicarbonate B202440-BLK1 5.0NDmg/L 5.0 2 <br />Carbonate Alkalinity as CaCO3 B202440-BLK1 4.1NDmg/L 4.1 2 <br />Total Alkalinity as CaCO3 B202440-BLK1 4.1NDmg/L 4.1 2 <br />QC Batch ID: B204877 <br />Dissolved Hardness as CaCO3 B204877-BLK1 0.50NDmg/L 0.10 3 <br />QC Batch ID: B204880 <br />Chloride B204880-BLK1 0.50NDmg/L 0.13 4 <br />Nitrate as N B204880-BLK1 0.10NDmg/L 0.024 4 <br />Sulfate B204880-BLK1 1.0NDmg/L 0.14 4 <br />QC Batch ID: B204891 <br />Dissolved Calcium B204891-BLK1 0.10NDmg/L 0.016 5 <br />Dissolved Magnesium B204891-BLK1 0.050NDmg/L 0.022 5 <br />Dissolved Sodium B204891-BLK1 1.0NDmg/L 0.051 5 <br />Dissolved Potassium B204891-BLK1 1.0NDmg/L 0.10 5 <br />QC Batch ID: B205054 <br />Total Dissolved Solids @ 180 C B205054-BLK1 6.7NDmg/L 3.3 6 <br />QC Batch ID: B205105 <br />Chemical Oxygen Demand B205105-BLK1 25NDmg O2/L 4.3 7 <br />QC Batch ID: B205309 <br />Total Calcium B205309-BLK1 0.10 J0.033300 mg/L 0.015 8 <br />Total Magnesium B205309-BLK1 0.050NDmg/L 0.019 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 28Report ID: 1001569791