Representative Projects Fossil Plant Ash Pond Closure Work performed involved excavation and transport of approximately 875,000 tons of CCR to complete closure of an ash holding pond. Fossil Plant Dredge Cell Closure Cap Work performed involved installation of ~ 9,800,000 SF of flexible membrane liner, ~ 9,600,000 SF of geocomposite, and ~ 500,000 SF of geotextile fabric; placement of ~ 8,900,000 SF of cap cover soil; and installation of ~ 37,000 LF of high density polyethylene (HDPE) pipe. Fossil Plant Dry Fly Ash Stack Final Closure Work performed involved installation of ~ 3,500,000 SF of liner and geocomposite as well as ~ 900,000 SF of geotextile fabric, placement of ~ 190,000 CY of cap cover soil and ~ 60,000 CY of subgrade fill material, installation of ~ 13,000 LF of HDPE pipe, and spreading of ~ 24,000 tons of access road stone. Fossil Plant Combined-Cycle Natural Gas Plant Work performed involved site development work for the new plant that included clearing and grubbing of a 12 acre site, 615,000 CY of excavation, 220,000 SY of grading, and installation of storm drainage and outlet control structures. Dan River CCR Recovery Work performed involved removal of ~ 3,000 tons of CCR from the Dan River at several locations - release resulted Work performed involved construction of a 19 acre flue gas desulfurization (FGD) gypsum by-product handling facility that included installation of a composite liner consisting of HDPE liner, Gundseal, and geocomposite drainage net as well as construction of concrete sumps, concrete drainage aprons, and a truck scale. SteamStation Structural Fill Cap Work performed involved closure of a 22 acre fly ash structural fill area that included transport of ~ 80,000 CY of fly ash from the site to a landfill; re-location of ~ 90,000 CY of fly ash at the site; and installation of ~ 930,000 SF of linear low density polyethylene liner, ~ 900,000 SF of geosynthetic drainage layer, and ~ 10,600 LF of toe and interceptor drains. SteamStation Fly Ash Landfill Construction Work performed involved construction of two fly ash storage ponds (33 total acres) that included ~ 1,100,000 CY of excavation, ~ 168,000 CY of embankment construction, installation of ~ 1,300,000 SF of HDPE liner, construction of internal cell berms, installation of HDPE piping and leachate sump risers with pumps, and construction of a leachate lift station. SteamStation FGDGypsumLandfill Construction Work performed involved construction of a FGD gypsum landfill cell that included 17 acres of subgrade preparation and installation of the cell liner consisting of ~ 520,000 SF of unreinforced geosynthetic clay liner and smooth HDPE liner, ~ 230,000 SF of reinforced geosynthetic clay liner and textured HDPE liner, and ~ 750,000 SF of gas diffusion layer material. from failure of a steam station ash holding pond. Power Station FGDGypsumHandling Facility
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