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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 - 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: B204915 Used client sample: N <br />MSBenzene 24.810 70 - 130ND25.000 99.22501148-01 ug/L 1 <br />MSD 26.210 5.5 20 70 - 130ND25.000 1052501148-01 ug/L 2 <br />MSBromodichloromethane 23.840 70 - 130ND25.000 95.42501148-01 ug/L 1 <br />MSD 25.370 6.2 20 70 - 130ND25.000 1012501148-01 ug/L 2 <br />MSChlorobenzene 24.860 70 - 130ND25.000 99.42501148-01 ug/L 1 <br />MSD 27.410 9.8 20 70 - 130ND25.000 1102501148-01 ug/L 2 <br />MSChloroethane 29.080 70 - 130ND25.000 1162501148-01 ug/L 1 <br />MSD 29.650 1.9 20 70 - 130ND25.000 1192501148-01 ug/L 2 <br />MS1,4-Dichlorobenzene 24.900 70 - 130ND25.000 99.62501148-01 ug/L 1 <br />MSD 27.280 9.1 20 70 - 130ND25.000 1092501148-01 ug/L 2 <br />MS1,1-Dichloroethane 24.560 70 - 130ND25.000 98.22501148-01 ug/L 1 <br />MSD 25.870 5.2 20 70 - 130ND25.000 1032501148-01 ug/L 2 <br />MS1,1-Dichloroethene 25.430 70 - 130ND25.000 1022501148-01 ug/L 1 <br />MSD 27.100 6.4 20 70 - 130ND25.000 1082501148-01 ug/L 2 <br />MSToluene 24.640 70 - 130ND25.000 98.62501148-01 ug/L 1 <br />MSD 26.340 6.7 20 70 - 130ND25.000 1052501148-01 ug/L 2 <br />MSTrichloroethene 24.150 70 - 130ND25.000 96.62501148-01 ug/L 1 <br />MSD 26.070 7.6 20 70 - 130ND25.000 1042501148-01 ug/L 2 <br />MS1,2-Dichloroethane-d4 (Surrogate)10.370 75 - 125ND10.000 1042501148-01 ug/L 1 <br />MSD 10.440 0.7 75 - 125ND10.000 1042501148-01 ug/L 2 <br />MSToluene-d8 (Surrogate)10.170 80 - 120ND10.000 1022501148-01 ug/L 1 <br />MSD 10.070 1.0 80 - 120ND10.000 1012501148-01 ug/L 2 <br />MS4-Bromofluorobenzene (Surrogate)9.8800 80 - 120ND10.000 98.82501148-01 ug/L 1 <br />MSD 9.5000 3.9 80 - 120ND10.000 95.02501148-01 ug/L 2 <br />QC Batch ID: B205122 Used client sample: N <br />MS1,2-Dichloroethane-d4 (Surrogate)10.740 75 - 125ND10.000 1072501449-07 ug/L 3 <br />MSD 10.990 2.3 75 - 125ND10.000 1102501449-07 ug/L 4 <br />MSToluene-d8 (Surrogate)10.250 80 - 120ND10.000 1022501449-07 ug/L 3 <br />MSD 10.250 0 80 - 120ND10.000 1022501449-07 ug/L 4 <br />MS4-Bromofluorobenzene (Surrogate)10.100 80 - 120ND10.000 1012501449-07 ug/L 3 <br />MSD 10.290 1.9 80 - 120ND10.000 1032501449-07 ug/L 4 <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 34 of 40Report ID: 1001567776