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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 - 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: B202441 <br />Total Alkalinity as CaCO3 B202441-BS3 LCS 101.47 100.00 101 90 - 110mg/L 1 <br />QC Batch ID: B202442 <br />Total Alkalinity as CaCO3 B202442-BS3 LCS 103.60 100.00 104 90 - 110mg/L 2 <br />QC Batch ID: B204959 <br />Chloride B204959-BS1 LCS 51.406 50.000 103 90 - 110mg/L 3 <br />Nitrate as N B204959-BS1 LCS 5.1590 5.0000 103 90 - 110mg/L 3 <br />Sulfate B204959-BS1 LCS 101.85 100.00 102 90 - 110mg/L 3 <br />QC Batch ID: B205012 <br />Dissolved Calcium B205012-BS1 LCS 10.734 10.000 107 80 - 120mg/L 4 <br />LCSDB205012-BSD1 10.644 10.000 106 0.8 80 - 120 20mg/L 5 <br />Dissolved Magnesium B205012-BS1 LCS 10.899 10.000 109 80 - 120mg/L 4 <br />LCSDB205012-BSD1 10.944 10.000 109 0.4 80 - 120 20mg/L 5 <br />Dissolved Sodium B205012-BS1 LCS 11.099 10.000 111 80 - 120mg/L 4 <br />LCSDB205012-BSD1 11.126 10.000 111 0.2 80 - 120 20mg/L 5 <br />Dissolved Potassium B205012-BS1 LCS 10.753 10.000 108 80 - 120mg/L 4 <br />LCSDB205012-BSD1 10.703 10.000 107 0.5 80 - 120 20mg/L 5 <br />QC Batch ID: B205105 <br />Chemical Oxygen Demand B205105-BS1 LCS 756.17 750.00 101 90 - 110mg O2/L 6 <br />QC Batch ID: B205106 <br />Chemical Oxygen Demand B205106-BS1 LCS 756.17 750.00 101 90 - 110mg O2/L 7 <br />QC Batch ID: B205191 <br />Total Dissolved Solids @ 180 C B205191-BS1 LCS 560.00 586.00 95.6 90 - 110mg/L 8 <br />LCSDB205191-BSD1 555.00 586.00 94.7 0.9 90 - 110 10mg/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 50 of 54Report ID: 1001568851