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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 - Laboratory Control Sample <br />Constituent <br />Control Limits <br />PercentPercentSpike <br />QC Sample ID Type Result Level Units Recovery RPD Recovery RPD Quals <br />Water Analysis (General Chemistry) <br />Run # <br />Lab <br />QC Batch ID: B202439 <br />Total Alkalinity as CaCO3 B202439-BS3 LCS 105.58 100.00 106 90 - 110mg/L 1 <br />QC Batch ID: B202440 <br />Total Alkalinity as CaCO3 B202440-BS3 LCS 101.93 100.00 102 90 - 110mg/L 2 <br />QC Batch ID: B204880 <br />Chloride B204880-BS1 LCS 50.002 50.000 100 90 - 110mg/L 3 <br />LCSDB204880-BSD1 50.151 50.000 100 0.3 90 - 110 10mg/L 4 <br />Nitrate as N B204880-BS1 LCS 4.9320 5.0000 98.6 90 - 110mg/L 3 <br />LCSDB204880-BSD1 4.9425 5.0000 98.8 0.2 90 - 110 10mg/L 4 <br />Sulfate B204880-BS1 LCS 100.02 100.00 100 90 - 110mg/L 3 <br />LCSDB204880-BSD1 100.09 100.00 100 0.1 90 - 110 10mg/L 4 <br />QC Batch ID: B204891 <br />Dissolved Calcium B204891-BS1 LCS 10.087 10.000 101 80 - 120mg/L 5 <br />Dissolved Magnesium B204891-BS1 LCS 9.9583 10.000 99.6 80 - 120mg/L 5 <br />Dissolved Sodium B204891-BS1 LCS 9.7580 10.000 97.6 80 - 120mg/L 5 <br />Dissolved Potassium B204891-BS1 LCS 9.8707 10.000 98.7 80 - 120mg/L 5 <br />QC Batch ID: B205054 <br />Total Dissolved Solids @ 180 C B205054-BS1 LCS 590.00 586.00 101 90 - 110mg/L 6 <br />QC Batch ID: B205105 <br />Chemical Oxygen Demand B205105-BS1 LCS 756.17 750.00 101 90 - 110mg O2/L 7 <br />QC Batch ID: B205309 <br />Total Calcium B205309-BS1 LCS 9.7272 10.000 97.3 85 - 115mg/L 8 <br />LCSDB205309-BSD1 10.306 10.000 103 5.8 85 - 115 20mg/L 9 <br />Total Magnesium B205309-BS1 LCS 9.8718 10.000 98.7 85 - 115mg/L 8 <br />LCSDB205309-BSD1 10.618 10.000 106 7.3 85 - 115 20mg/L 9 <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 24 of 28Report ID: 1001569791