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C <br /> ace Analytical <br /> ENVIRONMENTAL SCIENCES <br /> Arcadis-SLO Reported: 04/13/2026 15:17 <br /> 4119 Broad Street Suite 210 Project: Forward Landfill-COELT <br /> San Luis Obispo,CA 93401 Project Number: 30274343.01 1 Q26 Extraction Wells <br /> Project Manager: Dalia Rumani <br /> Volatile Organic Analysis (EPA Method 826013) <br /> Quality Control Report - Precision & Accuracy <br /> Control Limits <br /> Source Source Spike Percent Percent Lab <br /> Constituent Type Sample ID Result Result Added Units RPD Recovery RPD Recovery Quals R# <br /> QC Batch ID: B227258 Used client sample: N <br /> Benzene MS 2601882-01 ND 25.790 25.000 ug/L 103 70-130 1 <br /> MSD 2601882-01 ND 26.660 25.000 ug/L 3.3 107 20 70-130 2 <br /> Bromodichloromethane MS 2601882-01 ND 25.080 25.000 ug/L 100 70-130 1 <br /> MSD 2601882-01 ND 25.800 25.000 ug/L 2.8 103 20 70-130 2 <br /> Chlorobenzene MS 2601882-01 ND 24.830 25.000 ug/L 99.3 70-130 1 <br /> MSD 2601882-01 ND 25.550 25.000 ug/L 2.9 102 20 70-130 2 <br /> Chloroethane MS 2601882-01 ND 25.420 25.000 ug/L 102 70-130 1 <br /> MSD 2601882-01 ND 24.670 25.000 ug/L 3.0 98.7 20 70-130 2 <br /> 1,4-Dichlorobenzene MS 2601882-01 ND 24.730 25.000 ug/L 98.9 70-130 1 <br /> MSD 2601882-01 ND 25.480 25.000 ug/L 3.0 102 20 70-130 2 <br /> 1,1-Dichloroethane MS 2601882-01 ND 26.220 25.000 ug/L 105 70-130 1 <br /> MSD 2601882-01 ND 27.010 25.000 ug/L 3.0 108 20 70-130 2 <br /> 1,1-Dichloroethene MS 2601882-01 ND 29.650 25.000 ug/L 119 70-130 1 <br /> MSD 2601882-01 ND 30.290 25.000 ug/L 2.1 121 20 70-130 2 <br /> Toluene MS 2601882-01 ND 27.110 25.000 ug/L 108 70-130 1 <br /> MSD 2601882-01 ND 27.510 25.000 ug/L 1.5 110 20 70-130 2 <br /> Trichloroethene MS 2601882-01 ND 26.120 25.000 ug/L 104 70-130 1 <br /> MSD 2601882-01 ND 26.830 25.000 ug/L 2.7 107 20 70-130 2 <br /> 1,2-Dichloroethane-d4(Surrogate) MS 2601882-01 ND 10.460 10.000 ug/L 105 75-125 1 <br /> MSD 2601882-01 ND 10.470 10.000 ug/L 0.1 105 75-125 2 <br /> Toluene-d8(Surrogate) MS 2601882-01 ND 10.110 10.000 ug/L 101 80-120 1 <br /> MSD 2601882-01 ND 10.120 10.000 ug/L 0.1 101 80-120 2 <br /> 4-Bromofluorobenzene(Surrogate) MS 2601882-01 ND 10.110 10.000 ug/L 101 80-120 1 <br /> MSD 2601882-01 ND 10.180 10.000 ug/L 0.7 102 80-120 2 <br /> Run <br /> Run# QC Sample ID QC Type Method Prep Date Date Time Analyst Instrument Dilution <br /> 1 B227258-MS1 MS EPA-8260B 02/16/26 02/16/2611:14 RCC MS-V15 1 <br /> 2 B227258-MSD1 MSD EPA-8260B 02/16/26 02/16/2611:43 RCC MS-V15 1 <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 /> Report ID: 1001665559 4100 Atlas Court Bakersfield,CA 93308 (661)327-4911 FAX(661)327-1918 www.pacelabs.com Page 32 of 39 <br />