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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-Leachate Sampling <br />631038217 <br />Sandra Pimienta <br />Reported:02/04/2025 10:07 <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: B204915 <br />Benzene B204915-BS1 LCS 23.360 25.000 93.4 70 - 130ug/L 1 <br />Bromodichloromethane B204915-BS1 LCS 23.310 25.000 93.2 70 - 130ug/L 1 <br />Chlorobenzene B204915-BS1 LCS 25.760 25.000 103 70 - 130ug/L 1 <br />Chloroethane B204915-BS1 LCS 28.900 25.000 116 70 - 130ug/L 1 <br />1,4-Dichlorobenzene B204915-BS1 LCS 25.590 25.000 102 70 - 130ug/L 1 <br />1,1-Dichloroethane B204915-BS1 LCS 22.980 25.000 91.9 70 - 130ug/L 1 <br />1,1-Dichloroethene B204915-BS1 LCS 24.420 25.000 97.7 70 - 130ug/L 1 <br />Toluene B204915-BS1 LCS 25.310 25.000 101 70 - 130ug/L 1 <br />Trichloroethene B204915-BS1 LCS 25.070 25.000 100 70 - 130ug/L 1 <br />1,2-Dichloroethane-d4 (Surrogate) B204915-BS1 LCS 8.9400 10.000 89.4 75 - 125ug/L 1 <br />Toluene-d8 (Surrogate)B204915-BS1 LCS 10.170 10.000 102 80 - 120ug/L 1 <br />4-Bromofluorobenzene (Surrogate) B204915-BS1 LCS 9.6400 10.000 96.4 80 - 120ug/L 1 <br />QC Batch ID: B205122 <br />1,2-Dichloroethane-d4 (Surrogate) B205122-BS1 LCS 10.850 10.000 108 75 - 125ug/L 2 <br />Toluene-d8 (Surrogate)B205122-BS1 LCS 10.180 10.000 102 80 - 120ug/L 2 <br />4-Bromofluorobenzene (Surrogate) B205122-BS1 LCS 10.420 10.000 104 80 - 120ug/L 2 <br />Run # QC Sample ID QC Type Method Prep Date <br />Run <br />Analyst Instrument DilutionDate Time <br /> 1 B204915-BS1 LCS EPA-8260B RCC MS-V15 101/24/25 01/24/25 21:36 <br /> 2 B205122-BS1 LCS EPA-8260B AGB MS-V20 101/29/25 01/30/25 00:30 <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 33 of 40Report ID: 1001567776