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Arcadis- SLO <br />4119 Broad Street Suite 210 <br />San Luis Obispo, CA 93401 <br />Project: <br />Project Number: <br />Project Manager: <br />Forward LF- Domestic Residential Sampling <br />[none] <br /> Zina Kamal <br />Reported:09/25/2023 12:05 <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: B174443 Used client sample: N <br />MSBenzene 20.420 70 - 130ND25.000 81.72318014-01 ug/L 1 <br />MSD 20.730 1.5 20 70 - 130ND25.000 82.92318014-01 ug/L 2 <br />MSBromodichloromethane 25.690 70 - 130ND25.000 1032318014-01 ug/L 1 <br />MSD 26.520 3.2 20 70 - 130ND25.000 1062318014-01 ug/L 2 <br />MSChlorobenzene 25.490 70 - 130ND25.000 1022318014-01 ug/L 1 <br />MSD 26.960 5.6 20 70 - 130ND25.000 1082318014-01 ug/L 2 <br />MSChloroethane 26.490 70 - 130ND25.000 1062318014-01 ug/L 1 <br />MSD 26.850 1.3 20 70 - 130ND25.000 1072318014-01 ug/L 2 <br />MS1,4-Dichlorobenzene 28.620 70 - 130ND25.000 1142318014-01 ug/L 1 <br />MSD 29.140 1.8 20 70 - 130ND25.000 1172318014-01 ug/L 2 <br />MS1,1-Dichloroethane 19.740 70 - 130ND25.000 79.02318014-01 ug/L 1 <br />MSD 20.060 1.6 20 70 - 130ND25.000 80.22318014-01 ug/L 2 <br />MS1,1-Dichloroethene 20.690 70 - 130ND25.000 82.82318014-01 ug/L 1 <br />MSD 21.290 2.9 20 70 - 130ND25.000 85.22318014-01 ug/L 2 <br />MSToluene 23.470 70 - 130ND25.000 93.92318014-01 ug/L 1 <br />MSD 24.330 3.6 20 70 - 130ND25.000 97.32318014-01 ug/L 2 <br />MSTrichloroethene 20.910 70 - 130ND25.000 83.62318014-01 ug/L 1 <br />MSD 21.680 3.6 20 70 - 130ND25.000 86.72318014-01 ug/L 2 <br />MS1,2-Dichloroethane-d4 (Surrogate)11.990 75 - 125ND10.000 1202318014-01 ug/L 1 <br />MSD 10.990 8.7 75 - 125ND10.000 1102318014-01 ug/L 2 <br />MSToluene-d8 (Surrogate)9.8300 80 - 120ND10.000 98.32318014-01 ug/L 1 <br />MSD 10.010 1.8 80 - 120ND10.000 1002318014-01 ug/L 2 <br />MS4-Bromofluorobenzene (Surrogate)11.030 80 - 120ND10.000 1102318014-01 ug/L 1 <br />MSD 10.600 4.0 80 - 120ND10.000 1062318014-01 ug/L 2 <br />Run #QC Sample ID QC Type Method Prep Date <br />Run <br />Analyst Instrument DilutionDate Time <br /> 1 B174443-MS1 MS EPA-8260B RCC MSV-21 109/21/23 09/22/23 11:11 <br /> 2 B174443-MSD1 MSD EPA-8260B RCC MSV-21 109/21/23 09/22/23 11:38 <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 11 of 12Report ID: 1001457977