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Revised Quarterly Monitoring Report – <br />Fourth Quarter/Annual 2024 <br />www.arcadis.com <br />Revised - Forward Landfill 4Q24 Quarterly Mon Report 06262025 16 <br />Table 6-2 summarizes the VOC exceedances during 2024. <br />Table 6-2 Forward Landfill VOC Exceedances <br />Forward Unit Wells First Quarter <br />2024 <br />Second Quarter <br />2024 <br />Third Quarter <br />2024 <br />Fourth Quarter <br />2024 <br />MW-2A <br />1,1-DCA* <br />CFC-12* <br />PCE* <br />TCE* <br />1,1- DCA* <br />PCE* -- <br />1,1-DCA* <br />CFC-12* <br />TCE* <br />PCE* <br />MW-3 <br />1,1-DCA* <br />Chloroform* <br />cis-1,2-DCE* <br />-- -- -- <br />MW-10 <br />1,1-DCA* <br />Carbon <br />tetrachloride <br />CFC-11* <br />Chloroform <br />cis-1,2-DCE* <br />PCE* <br />TCE* <br />1,1-DCA* <br />Carbon <br />tetrachloride <br />Chloroform <br />(The same VOCs <br />were detected in <br />the duplicate <br />sample collected at <br />MW-10.) <br />1,1-DCA* <br />Carbon <br />tetrachloride <br />CFC-11* <br />Chloroform <br />Carbon <br />tetrachloride* <br />Chloroform <br />(Only chloroform <br />was detected in the <br />duplicate sample <br />collected at MW- <br />10.) <br />MW-17 -- -- CFC-11* -- <br />MW-19R <br />1,1-DCA* <br />Carbon <br />tetrachloride* <br />Chloroform* <br />-- -- <br />1,1-DCA* <br />Carbon <br />tetrachloride* <br />Chloroform* <br />MW-23R -- -- Acetone* -- <br />AMW-6 PCE and TCE* PCE and TCE* PCE and TCE* PCE and TCE* <br />AMW-12 PCE PCE PCE PCE <br />Notes: <br />* Indicates the analyte was detected at estimated trace (J-flagged) concentrations. <br />1,1-DCA = 1,1-dichloroethane <br />CFC-11 = trichlorofluoromethane <br />CFC-12 = dichlorodifluoromethane <br />6.1.2 Unsaturated Zone Monitoring <br />Unsaturated zone monitoring is conducted in accordance with MRP Section B.2 (RWQCB 2024a). Quarterly <br />monitoring of the site lysimeters (Table 1, Figures 2 and 3) was conducted during the first, second, and third