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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 - Laboratory Control Sample <br />Constituent <br />Control Limits <br />PercentPercentSpike <br />QC Sample ID Type Result Level Units Recovery RPD Recovery RPD Quals <br />Volatile Organic Analysis (EPA Method 8260B) <br />Run # <br />Lab <br />QC Batch ID: B174443 <br />Benzene B174443-BS1 LCS 18.530 25.000 74.1 70 - 130ug/L 1 <br />Bromodichloromethane B174443-BS1 LCS 23.990 25.000 96.0 70 - 130ug/L 1 <br />Chlorobenzene B174443-BS1 LCS 24.180 25.000 96.7 70 - 130ug/L 1 <br />Chloroethane B174443-BS1 LCS 24.120 25.000 96.5 70 - 130ug/L 1 <br />1,4-Dichlorobenzene B174443-BS1 LCS 27.330 25.000 109 70 - 130ug/L 1 <br />1,1-Dichloroethane B174443-BS1 LCS 17.920 25.000 71.7 70 - 130ug/L 1 <br />1,1-Dichloroethene B174443-BS1 LCS 19.670 25.000 78.7 70 - 130ug/L 1 <br />Toluene B174443-BS1 LCS 22.000 25.000 88.0 70 - 130ug/L 1 <br />Trichloroethene B174443-BS1 LCS 21.120 25.000 84.5 70 - 130ug/L 1 <br />1,2-Dichloroethane-d4 (Surrogate)B174443-BS1 LCS 9.2100 10.000 92.1 75 - 125ug/L 1 <br />Toluene-d8 (Surrogate)B174443-BS1 LCS 10.040 10.000 100 80 - 120ug/L 1 <br />4-Bromofluorobenzene (Surrogate)B174443-BS1 LCS 10.290 10.000 103 80 - 120ug/L 1 <br />Run #QC Sample ID QC Type Method Prep Date <br />Run <br />Analyst Instrument DilutionDate Time <br /> 1 B174443-BS1 LCS EPA-8260B RCC MSV-21 109/21/23 09/22/23 10:43 <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 10 of 12Report ID: 1001457977