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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-Groundwater <br />631038217 <br />Sandra Pimienta <br />Reported:02/13/2025 14:18 <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: B204997 <br />Benzene B204997-BS1 LCS 26.210 25.000 105 70 - 130ug/L 1 <br />Bromodichloromethane B204997-BS1 LCS 26.510 25.000 106 70 - 130ug/L 1 <br />Chlorobenzene B204997-BS1 LCS 25.610 25.000 102 70 - 130ug/L 1 <br />Chloroethane B204997-BS1 LCS 25.870 25.000 103 70 - 130ug/L 1 <br />1,4-Dichlorobenzene B204997-BS1 LCS 25.290 25.000 101 70 - 130ug/L 1 <br />1,1-Dichloroethane B204997-BS1 LCS 26.750 25.000 107 70 - 130ug/L 1 <br />1,1-Dichloroethene B204997-BS1 LCS 26.820 25.000 107 70 - 130ug/L 1 <br />Toluene B204997-BS1 LCS 25.410 25.000 102 70 - 130ug/L 1 <br />Trichloroethene B204997-BS1 LCS 25.660 25.000 103 70 - 130ug/L 1 <br />1,2-Dichloroethane-d4 (Surrogate) B204997-BS1 LCS 10.580 10.000 106 75 - 125ug/L 1 <br />Toluene-d8 (Surrogate)B204997-BS1 LCS 10.230 10.000 102 80 - 120ug/L 1 <br />4-Bromofluorobenzene (Surrogate) B204997-BS1 LCS 10.440 10.000 104 80 - 120ug/L 1 <br />Run # QC Sample ID QC Type Method Prep Date <br />Run <br />Analyst Instrument DilutionDate Time <br /> 1 B204997-BS1 LCS EPA-8260B AGB MS-V20 101/27/25 01/27/25 12:42 <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 20 of 28Report ID: 1001569791