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Mr. Brendan P. Kenny, RG <br /> Corrective Action Program Update Second Quarter 2026 <br /> July 10, 2026 <br /> Page 2 <br /> Table 1 presents the probe monitoring data for the second quarter of 2026. On June 26, methane <br /> concentrations at GP-10 ranged from 0% to 0.5%, well below the historically elevated <br /> concentrations of 30%to 50% detected at this probe. <br /> On 11 June and 26 June 2026,the following gas probes had methane concentrations exceeding 1% <br /> by volume: <br /> Date Gas Probe Observed Methane <br /> Concentration <br /> 11 June 2026 GP-lAD 4.9%by volume <br /> 11 June 2026 GP-lAM 1.5%by volume <br /> 11 June 2026 GP-lAS 18.7%by volume <br /> 11 June 2026 GP-2AS 12.3%by volume <br /> 11 June 2026 GP-10D 27.4%by volume <br /> 11 June 2026 GP-10M 19.5%by volume <br /> 26 June 2026 GP-lAD 4.5%by volume <br /> 26 June 2026 GP-lAS 16.5%by volume <br /> 26 June 2026 GP-2AM 1.3%by volume <br /> 26 June 2026 GP-2AS 8.3%by volume <br /> On 11 June and 26 June 2026, the following gas probes had VOC exceedances above 10 ppbv: <br /> Date Gas Probe Observed VOC <br /> Exceedances by <br /> 11 June 2026 GP-2AD 300 <br /> 11 June 2026 GP-2AM 1600 <br /> 11 June 2026 GP-3AS 12800 <br /> 11 June 2026 GP-4AD 7600 <br /> 11 June 2026 GP-4AS 3600 <br /> 11 June 2026 GP-5AD 300 <br /> 11 June 2026 GP-5AM 8900 <br /> 11 June 2026 GP-6AM 1000 <br /> 11 June 2026 GP-10S 9100 <br /> 26 June 2026 GP-2AD 900 <br /> 26 June 2026 GP-2AM 2000 <br /> 26 June 2026 GP-3AD 600 <br /> 26 June 2026 GP-3AM 600 <br /> 26 June 2026 GP-3AS 2200 <br /> 26 June 2026 GP-4AD 16800 <br /> 26 June 2026 GP-4AS 1600 <br /> 26 June 2026 GP-5AD 300 <br /> Q2 Corrective Action Program Update-2026 <br /> engineers I scientists I innovators <br />