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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 />Foothill Landfill, SJ County <br />631038217 <br />Sandra Pimienta <br />Reported:01/22/2025 17:07 <br />Quality Control Report - Precision & Accuracy <br />Constituent Sample IDType Result Result Added Units RPD Recovery RPD Recovery Quals <br />Source Spike Percent Percent <br />Control Limits <br />Metals Analysis <br />Source Lab <br />R# <br />QC Batch ID: B204521 Used client sample: N <br />Total Nickel DUP ND 20ND2500656-04 ug/L 1 <br />MS 389.70 75 - 125ND400.00 97.42500656-04 ug/L 2 <br />MSD 425.40 8.8 20 75 - 125ND400.00 1062500656-04 ug/L 3 <br />Total Selenium DUP ND 20ND2500656-04 ug/L 1 <br />MS 180.90 75 - 125ND200.00 90.42500656-04 ug/L 2 <br />MSD 199.70 9.9 20 75 - 125ND200.00 99.82500656-04 ug/L 3 <br />Total Silver DUP ND 20ND2500656-04 ug/L 1 <br />MS 96.600 75 - 125ND100.00 96.62500656-04 ug/L 2 <br />MSD 106.00 9.3 20 75 - 125ND100.00 1062500656-04 ug/L 3 <br />Total Tin DUP ND 20ND2500656-04 ug/L 1 <br />MS 204.70 75 - 125ND200.00 1022500656-04 ug/L 2 <br />MSD 223.90 9.0 20 75 - 125ND200.00 1122500656-04 ug/L 3 <br />Total Thallium DUP ND 20ND2500656-04 ug/L 1 <br />MS 389.00 75 - 125ND400.00 97.22500656-04 ug/L 2 <br />MSD 424.50 8.7 20 75 - 125ND400.00 1062500656-04 ug/L 3 <br />Total Vanadium DUP ND 20ND2500656-04 ug/L 1 <br />MS 201.90 75 - 125ND200.00 1012500656-04 ug/L 2 <br />MSD 220.90 9.0 20 75 - 125ND200.00 1102500656-04 ug/L 3 <br />Total Zinc DUP ND 2011.1002500656-04 ug/L 1 <br />MS 491.20 75 - 12511.100 500.00 96.02500656-04 ug/L 2 <br />MSD 530.10 7.6 20 75 - 12511.100 500.00 1042500656-04 ug/L 3 <br />QC Batch ID: B204703 Used client sample: N <br />Total Mercury DUP ND 200.0220752500583-04 ug/L 4 <br />MS 0.98250 70 - 1300.022075 1.0000 96.02500583-04 ug/L 5 <br />MSD 1.0750 9.0 20 70 - 1300.022075 1.0000 1052500583-04 ug/L 6 <br />Run # QC Sample ID QC Type Method Prep Date <br />Run <br />Analyst Instrument DilutionDate Time <br /> 1 B204521-DUP1 DUP EPA-6010B JEH ICP5 101/16/25 01/17/25 10:04 <br /> 2 B204521-MS1 MS EPA-6010B JEH ICP5 101/16/25 01/17/25 10:08 <br /> 3 B204521-MSD1 MSD EPA-6010B JEH ICP5 101/16/25 01/17/25 10:10 <br /> 4 B204703-DUP1 DUP EPA-7470A TMT CETAC4 101/21/25 01/21/25 13:33 <br /> 5 B204703-MS1 MS EPA-7470A TMT CETAC4 101/21/25 01/21/25 13:38 <br /> 6 B204703-MSD1 MSD EPA-7470A TMT CETAC4 101/21/25 01/21/25 13:41 <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 39 of 40Report ID: 1001565394