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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 - Precision & Accuracy <br />Constituent Sample IDType Result Result Added Units RPD Recovery RPD Recovery Quals <br />Source Spike Percent Percent <br />Control Limits <br />Volatile Organic Analysis (EPA Method 8260B) <br />Source Lab <br />R# <br />QC Batch ID: B204997 Used client sample: N <br />MSBenzene 26.950 70 - 130ND25.000 1082501328-01 ug/L 1 <br />MSD 25.700 4.7 20 70 - 130ND25.000 1032501328-01 ug/L 2 <br />MSBromodichloromethane 26.840 70 - 130ND25.000 1072501328-01 ug/L 1 <br />MSD 25.740 4.2 20 70 - 130ND25.000 1032501328-01 ug/L 2 <br />MSChlorobenzene 26.450 70 - 130ND25.000 1062501328-01 ug/L 1 <br />MSD 25.120 5.2 20 70 - 130ND25.000 1002501328-01 ug/L 2 <br />MSChloroethane 26.740 70 - 130ND25.000 1072501328-01 ug/L 1 <br />MSD 25.170 6.0 20 70 - 130ND25.000 1012501328-01 ug/L 2 <br />MS1,4-Dichlorobenzene 27.320 70 - 130ND25.000 1092501328-01 ug/L 1 <br />MSD 25.840 5.6 20 70 - 130ND25.000 1032501328-01 ug/L 2 <br />MS1,1-Dichloroethane 27.240 70 - 130ND25.000 1092501328-01 ug/L 1 <br />MSD 26.160 4.0 20 70 - 130ND25.000 1052501328-01 ug/L 2 <br />MS1,1-Dichloroethene 28.260 70 - 130ND25.000 1132501328-01 ug/L 1 <br />MSD 27.100 4.2 20 70 - 130ND25.000 1082501328-01 ug/L 2 <br />MSToluene 26.160 70 - 130ND25.000 1052501328-01 ug/L 1 <br />MSD 24.900 4.9 20 70 - 130ND25.000 99.62501328-01 ug/L 2 <br />MSTrichloroethene 26.550 70 - 130ND25.000 1062501328-01 ug/L 1 <br />MSD 25.310 4.8 20 70 - 130ND25.000 1012501328-01 ug/L 2 <br />MS1,2-Dichloroethane-d4 (Surrogate)10.330 75 - 125ND10.000 1032501328-01 ug/L 1 <br />MSD 10.360 0.3 75 - 125ND10.000 1042501328-01 ug/L 2 <br />MSToluene-d8 (Surrogate)10.150 80 - 120ND10.000 1022501328-01 ug/L 1 <br />MSD 10.290 1.4 80 - 120ND10.000 1032501328-01 ug/L 2 <br />MS4-Bromofluorobenzene (Surrogate)10.380 80 - 120ND10.000 1042501328-01 ug/L 1 <br />MSD 10.440 0.6 80 - 120ND10.000 1042501328-01 ug/L 2 <br />Run # QC Sample ID QC Type Method Prep Date <br />Run <br />Analyst Instrument DilutionDate Time <br /> 1 B204997-MS1 MS EPA-8260B AGB MS-V20 101/27/25 01/27/25 13:08 <br /> 2 B204997-MSD1 MSD EPA-8260B AGB MS-V20 101/27/25 01/27/25 13:33 <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 21 of 28Report ID: 1001569791