Abstract for Joint Meeting Discussion Items

Browse Search

67 Hillsborough Landfill (NONCD0000483) Remedial Investigation Work Summary Ziqiang Chen,PhD,Environmental Engineer II Pre-Regulatory Landfill Program,Superfund Section NCDEQ,Division of Waste Management 1646 Mail Service Center Raleigh,NC 27699-1646 (919)508-7144 zi-giang.chens@deg.nc.Gov 2024.08.16, Raleigh,NC 1). PRLF started the initial site investigation in later July or early August 2017. The Fist Phase Investigation Report completed and approved on May 29, 2018. (see Figs. 1 & 2 below). 2). The site waste delineation (waste boundary outline)was completed on November 23, 2018. (see Fig. 3, from 483DP-3 Report). 3). Initial site field work for above-ground landfill gas survey (Fig.4—methane gas monitoring; Fig. 5- mercury sampling), surface water(Fig. 6) and sediments (Fig. 7), were completed on January 17, 2019 (483DP-6 Report). 4). Groundwater monitoring wells were installed in Tasks 483DP-7,8& 9 in early 2019, report approved on June 20, 2019 (Fig. 8, groundwater monitoring wells location map. 483DP-9 Report); Following-up 3- month groundwater monitoring reports were approved on July 19, 2019 (Fig.9 Groundwater flow direction; and Fig. 10 groundwater sampling results. 483DP-12 Report). 5). Scattered pockets of wastes in the site were investigated in 483DP-14 report. Additional RI investigations were conducted and reported in 483DP-15,16& 17 report. 6). Comprehensive landfill gas sampling and analyses, potable well sampling, and surface water/sediments investigations were conducted during the years of 2020 through 2023. The final 483DP- 19-25 Report was approved on March 24, 2024. The key results include: Fig. 11 - Site Landfill gas monitoring results; Fig. 12— Potable well monitoring results; and Fig. 13,following-up surface water/sediments monitoring. 7). The anticipated date for completion of the site's investigation work in December, 2024.