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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 />SA2023 Domestic Sampling <br />Drew Feucht <br />Reported:09/19/2023 12:28 <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: B174129 <br />Benzene B174129-BS1 LCS 23.560 25.000 94.2 70 - 130ug/L 1 <br />LCSDB174129-BSD1 24.910 25.000 99.6 5.6 70 - 130 20ug/L 2 <br />Bromodichloromethane B174129-BS1 LCS 22.840 25.000 91.4 70 - 130ug/L 1 <br />LCSDB174129-BSD1 23.890 25.000 95.6 4.5 70 - 130 20ug/L 2 <br />Chlorobenzene B174129-BS1 LCS 22.960 25.000 91.8 70 - 130ug/L 1 <br />LCSDB174129-BSD1 24.090 25.000 96.4 4.8 70 - 130 20ug/L 2 <br />Chloroethane B174129-BS1 LCS 22.020 25.000 88.1 70 - 130ug/L 1 <br />LCSDB174129-BSD1 23.210 25.000 92.8 5.3 70 - 130 20ug/L 2 <br />1,4-Dichlorobenzene B174129-BS1 LCS 22.510 25.000 90.0 70 - 130ug/L 1 <br />LCSDB174129-BSD1 24.040 25.000 96.2 6.6 70 - 130 20ug/L 2 <br />1,1-Dichloroethane B174129-BS1 LCS 23.340 25.000 93.4 70 - 130ug/L 1 <br />LCSDB174129-BSD1 24.910 25.000 99.6 6.5 70 - 130 20ug/L 2 <br />1,1-Dichloroethene B174129-BS1 LCS 24.040 25.000 96.2 70 - 130ug/L 1 <br />LCSDB174129-BSD1 26.380 25.000 106 9.3 70 - 130 20ug/L 2 <br />Toluene B174129-BS1 LCS 22.320 25.000 89.3 70 - 130ug/L 1 <br />LCSDB174129-BSD1 23.760 25.000 95.0 6.3 70 - 130 20ug/L 2 <br />Trichloroethene B174129-BS1 LCS 20.580 25.000 82.3 70 - 130ug/L 1 <br />LCSDB174129-BSD1 23.010 25.000 92.0 11.1 70 - 130 20ug/L 2 <br />1,2-Dichloroethane-d4 (Surrogate)B174129-BS1 LCS 11.130 10.000 111 75 - 125ug/L 1 <br />LCSDB174129-BSD1 10.900 10.000 109 2.1 75 - 125ug/L 2 <br />Toluene-d8 (Surrogate)B174129-BS1 LCS 9.8500 10.000 98.5 80 - 120ug/L 1 <br />LCSDB174129-BSD1 9.8400 10.000 98.4 0.1 80 - 120ug/L 2 <br />4-Bromofluorobenzene (Surrogate)B174129-BS1 LCS 9.9400 10.000 99.4 80 - 120ug/L 1 <br />LCSDB174129-BSD1 10.120 10.000 101 1.8 80 - 120ug/L 2 <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 12 of 16Report ID: 1001456910