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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 11:58 <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: B174442 Used client sample: N <br />MSBenzene 22.000 70 - 130ND25.000 88.02318047-01 ug/L 1 <br />MSD 21.700 1.4 20 70 - 130ND25.000 86.82318047-01 ug/L 2 <br />MSBromodichloromethane 28.830 70 - 130ND25.000 1152318047-01 ug/L 1 <br />MSD 28.470 1.3 20 70 - 130ND25.000 1142318047-01 ug/L 2 <br />MSChlorobenzene 29.010 70 - 130ND25.000 1162318047-01 ug/L 1 <br />MSD 28.880 0.4 20 70 - 130ND25.000 1162318047-01 ug/L 2 <br />MSChloroethane 28.370 70 - 130ND25.000 1132318047-01 ug/L 1 <br />MSD 28.490 0.4 20 70 - 130ND25.000 1142318047-01 ug/L 2 <br />MS1,4-Dichlorobenzene 30.600 70 - 130ND25.000 1222318047-01 ug/L 1 <br />MSD 30.400 0.7 20 70 - 130ND25.000 1222318047-01 ug/L 2 <br />MS1,1-Dichloroethane 21.320 70 - 130ND25.000 85.32318047-01 ug/L 1 <br />MSD 21.290 0.1 20 70 - 130ND25.000 85.22318047-01 ug/L 2 <br />MS1,1-Dichloroethene 21.810 70 - 130ND25.000 87.22318047-01 ug/L 1 <br />MSD 21.720 0.4 20 70 - 130ND25.000 86.92318047-01 ug/L 2 <br />MSToluene 26.070 70 - 130ND25.000 1042318047-01 ug/L 1 <br />MSD 25.890 0.7 20 70 - 130ND25.000 1042318047-01 ug/L 2 <br />MSTrichloroethene 23.050 70 - 130ND25.000 92.22318047-01 ug/L 1 <br />MSD 23.220 0.7 20 70 - 130ND25.000 92.92318047-01 ug/L 2 <br />MS1,2-Dichloroethane-d4 (Surrogate)12.500 75 - 125ND10.000 1252318047-01 ug/L 1 <br />MSD 12.060 3.6 75 - 125ND10.000 1212318047-01 ug/L 2 <br />MSToluene-d8 (Surrogate)10.070 80 - 120ND10.000 1012318047-01 ug/L 1 <br />MSD 9.9600 1.1 80 - 120ND10.000 99.62318047-01 ug/L 2 <br />MS4-Bromofluorobenzene (Surrogate)11.080 80 - 120ND10.000 1112318047-01 ug/L 1 <br />MSD 11.100 0.2 80 - 120ND10.000 1112318047-01 ug/L 2 <br />Run #QC Sample ID QC Type Method Prep Date <br />Run <br />Analyst Instrument DilutionDate Time <br /> 1 B174442-MS1 MS EPA-8260B RCC MSV-21 109/21/23 09/21/23 23:24 <br /> 2 B174442-MSD1 MSD EPA-8260B RCC MSV-21 109/21/23 09/21/23 23:51 <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: 1001457971