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66 <br /> Attachment 4a <br /> A recent Hillsborough Landfill (NONCD0000483)Remedial Investigation Work Summary was <br /> produced by Zi-qiang Chen, an Environmental Engineer at NCDEQ, of all the work that has <br /> been completed thus far. The full summary document is attached. <br /> The timetable is excerpted below: <br /> 1). PRLF started the initial site investigation in later July or early August 2017. The <br /> First Phase Investigation Report completed and approved on May 29, 2018. (See Figs. I <br /> & 2 below). <br /> 2). The site waste delineation (waste boundary outline) was completed on November 23, <br /> 2018. (See Fig. 3,from 483DP-3 Report). <br /> 3). Initial site field work for above-ground landfill gas survey (Fig. 4—methane gas <br /> monitoring; Fig. 5-mercury sampling), surface water (Fig. 6) and sediments (Fig. 7), <br /> were completed on January 17, 2019 (483DP-6 Report). <br /> 4). Groundwater monitoring wells were installed in Tasks 483DP-7,8 & 9 in early 2019, <br /> Report approved on June 20, 2019 (Fig. 8, groundwater monitoring wells location map. <br /> 483DP-9 Report); Following-up 3-month groundwater monitoring reports were approved <br /> on July 19, 2019 (Fig.9 Groundwater flow direction; and Fig. 10 groundwater sampling <br /> results. 483DP-12 Report). <br /> 5). Scattered pockets of wastes in the site were investigated in 483DP-14 Report. <br /> Additional RI investigations were conducted and reported in 483DP-15,16& 17 Report. <br /> 6). Comprehensive landfill gas sampling and analyses,potable well sampling, and <br /> surface water/sediments investigations were conducted during the years of 2020 through <br /> 2023. The final 483DP-1925 Report was approved on March 24, 2024. The key results <br /> include: Fig. 11 - Site Landfill gas monitoring results; Fig. 12—Potable well monitoring <br /> results; and Fig. 13,following-up surface water/sediments monitoring. <br /> 7). The anticipated date for completion of the site's investigation work is December, <br /> 2024. <br /> Once the Remedial Investigation Summary Report is completed by the consultant and approved <br /> by NCDEQ, the PRLF Program will create a DRAFT remedy design plan. This DRAFT plan <br /> will be available at the public library and posted in the newspaper for 3 consecutive weeks, <br /> followed by a 45-day public commenting period in written form. NCDEQ will address each <br /> public comment in the finalized remedy design plan. <br />