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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-Leachate Sampling <br />631038217 <br />Sandra Pimienta <br />Reported:02/04/2025 10:07 <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: B204880 <br />Chloride B204880-BS1 LCS 50.002 50.000 100 90 - 110mg/L 2 <br />LCSDB204880-BSD1 50.151 50.000 100 0.3 90 - 110 10mg/L 3 <br />Nitrate as N B204880-BS1 LCS 4.9320 5.0000 98.6 90 - 110mg/L 2 <br />LCSDB204880-BSD1 4.9425 5.0000 98.8 0.2 90 - 110 10mg/L 3 <br />Sulfate B204880-BS1 LCS 100.02 100.00 100 90 - 110mg/L 2 <br />LCSDB204880-BSD1 100.09 100.00 100 0.1 90 - 110 10mg/L 3 <br />QC Batch ID: B204913 <br />Chemical Oxygen Demand B204913-BS1 LCS 751.84 750.00 100 90 - 110mg O2/L 4 <br />QC Batch ID: B205030 <br />Total Calcium B205030-BS1 LCS 10.195 10.000 102 80 - 120mg/L 5 <br />Total Magnesium B205030-BS1 LCS 10.033 10.000 100 80 - 120mg/L 5 <br />Total Sodium B205030-BS1 LCS 10.547 10.000 105 80 - 120mg/L 5 <br />Total Potassium B205030-BS1 LCS 10.039 10.000 100 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 />Run # QC Sample ID QC Type Method Prep Date <br />Run <br />Analyst Instrument DilutionDate Time <br /> 1 B202439-BS3 LCS EPA-310.1 ELR MET-1 101/27/25 01/27/25 12:32 <br /> 2 B204880-BS1 LCS EPA-300.0 PRE IC9 101/23/25 01/23/25 21:28 <br /> 3 B204880-BSD1 LCSD EPA-300.0 PRE IC9 101/23/25 01/23/25 21:41 <br /> 4 B204913-BS1 LCS EPA-410.4 JMN SPEC06 101/24/25 01/24/25 07:10 <br /> 5 B205030-BS1 LCS EPA-6010B NW1 ICP5 101/27/25 01/28/25 11:32 <br /> 6 B205054-BS1 LCS EPA-160.1 IJC MANUAL 501/28/25 01/28/25 14:45 <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 37 of 40Report ID: 1001567776