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Landfill Closure

•	 Mass	excavation	of	
   120,000	yards	of	fill	dirt,	
   placed	for	24”	landfill	
   cover
•	 Additional	6”	of	topsoil	
   placed	for	a	total	of	30”	
   cover
•	 Fine	grading	of	cover	dirt	
   and	topsoil
•	 Installation	of	storm	
   drainage
    •	 1,400	linear	feet	of	24”	
       HDPE	storm	drain	pipe
    •	 13	-	24”	storm	drains
    •	 450	feet	of	36”	HDPE	
       storm	drain	pipe
    •	 6	-	36”	storm	drains

•	 1000	tons	of	rip	rap	placed	
   for	erosion	control
•	 Seeding	of	approximately	
   18	acres	of	the	landfill	
   cover
•	 Rough	grading	and	
   seeding	of	12	acre	borrow	
   pit
Landfill Cell
Construction

•	 Constructed:
    •	   10	acre	refuse	cell
    •	   Retention	pond
    •	   2	-	drainage	ditches

•	 115,000	cubic	yards	of	mass	
   excavation	and	top	soil	
   removal
•	 25,000	cubic	yards	of	sand	
   placement	/	liner	cover
•	 Excavated	25,568	cubic	
   yards	to	construct	a	
   retention	pond	and	
   associated	ditches
•	 Excavated	30,644	cubic	
   yards	to	construct	drainage	
   ditch	around	perimeter	of	
   property
•	 Relied	on	off-road	trucks	to	
   complete	project	instead	of	
   scrapers	due	to	excessive	
   rains
    •	   Wet	topsoil	was	pushed	off	
         the	10	acres	and	stockpiled	
         offsite
Landfill Clay Cap


•	 Mass	excavation	of	
   46,600	cubic	yards	for	cell	
   construction
•	 Installed	250	linear	feet	of	
   collection	pipe
•	 Installed	175,500	square	
   feet	of	geosynthetic	clay	
   liner
•	 Installation	of	berm	and	
   sump
•	 Redistributed	19,600	
   square	yards	of	topsoil
•	 Constructed	haul	road,	
   ditches	and	installed	
   culverts
•	 Seeded	4	acres
Landfill Clay Liner

•	 Cleared	trees	and	vegetation	
   from	40	acres
•	 Mass	excavated	and	
   stockpiled	411,600	cubic	
   yards	of	soil
•	 Constructed	clay	liner	with	in	
   place	excavated	soils	from	
   within	liner	area
    •	   15,000	cubic	yards	of	
         earthwork	cutting	
         and	filling

    •	   Recompacted	
         156,000	cubic	yards	
         of	soil	liner

•	 Proofrolled	32	acres	
   of	liner	subgrade
•	 Replaced	6	inches	of	
   topsoil		over	14	acres
•	 Performed	dewatering,	
   dust	and	
   erosion	
   control,	and	
   haul	road	
   maintenance	
   throughout	
   project
Ash Pond
Construction

•	 Dewater	the	existing	120	acre	
   pond	and	stockpile	220,000	CY	of	
   bottom	ash	
•	 Construct	and	maintain	3	miles	
   of	haul	road	for	40	ton	articulated	
   trucks
•	 Blast,	haul,	place,	compact	and	
   grade	605,000	CY	of	Type	II	
   24a	stone	for	construction	of	the	
   starter	dike	and	working	platforms
•	 Install	drainage	for	the	working	
   platform	areas
    •	   1050’	of	6”	HDPE,	3220’	of	8”	
         HDPE,	4550’	of	12”	HDPE
    •	   525’	of	32”	concrete	encased	HDPE
    •	   Two	12’	diameter,	32’	deep	wet	
         wells	and	associated	mechanical	
         equipment	
    •	   Drainage	structures	for	system	
         connection	including	inlets,	
         manholes,	drop	boxes,	and	end	
         sections

•	 Demolish	existing	riser	structure	
   and	install	new	riser	structure
•	 Install	new	102’	span	pedestrian	
   bridge	and	associated	pier	
   structure
•	 Install	190,000	CY	of	compacted	
   clay	for	flexible	membrane	liner	
   placement
•	 Install	3,439,000	SF	each	of	
   flexible	membrane	liner	and	type	I	
   &	II	filter	fabric
•	 Place	21,500	CY	of	#2	stone	and	
   23,000	CY	of	#57	stone	as	ballast	
   on	the	liner	slopes
•	 Place	182,000	cubic	yards	of	
   bottom	ash	as	ballast	on	the	pond	
   bottom

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Landfill projects

  • 1. Landfill Closure • Mass excavation of 120,000 yards of fill dirt, placed for 24” landfill cover • Additional 6” of topsoil placed for a total of 30” cover • Fine grading of cover dirt and topsoil • Installation of storm drainage • 1,400 linear feet of 24” HDPE storm drain pipe • 13 - 24” storm drains • 450 feet of 36” HDPE storm drain pipe • 6 - 36” storm drains • 1000 tons of rip rap placed for erosion control • Seeding of approximately 18 acres of the landfill cover • Rough grading and seeding of 12 acre borrow pit
  • 2. Landfill Cell Construction • Constructed: • 10 acre refuse cell • Retention pond • 2 - drainage ditches • 115,000 cubic yards of mass excavation and top soil removal • 25,000 cubic yards of sand placement / liner cover • Excavated 25,568 cubic yards to construct a retention pond and associated ditches • Excavated 30,644 cubic yards to construct drainage ditch around perimeter of property • Relied on off-road trucks to complete project instead of scrapers due to excessive rains • Wet topsoil was pushed off the 10 acres and stockpiled offsite
  • 3. Landfill Clay Cap • Mass excavation of 46,600 cubic yards for cell construction • Installed 250 linear feet of collection pipe • Installed 175,500 square feet of geosynthetic clay liner • Installation of berm and sump • Redistributed 19,600 square yards of topsoil • Constructed haul road, ditches and installed culverts • Seeded 4 acres
  • 4. Landfill Clay Liner • Cleared trees and vegetation from 40 acres • Mass excavated and stockpiled 411,600 cubic yards of soil • Constructed clay liner with in place excavated soils from within liner area • 15,000 cubic yards of earthwork cutting and filling • Recompacted 156,000 cubic yards of soil liner • Proofrolled 32 acres of liner subgrade • Replaced 6 inches of topsoil over 14 acres • Performed dewatering, dust and erosion control, and haul road maintenance throughout project
  • 5. Ash Pond Construction • Dewater the existing 120 acre pond and stockpile 220,000 CY of bottom ash • Construct and maintain 3 miles of haul road for 40 ton articulated trucks • Blast, haul, place, compact and grade 605,000 CY of Type II 24a stone for construction of the starter dike and working platforms • Install drainage for the working platform areas • 1050’ of 6” HDPE, 3220’ of 8” HDPE, 4550’ of 12” HDPE • 525’ of 32” concrete encased HDPE • Two 12’ diameter, 32’ deep wet wells and associated mechanical equipment • Drainage structures for system connection including inlets, manholes, drop boxes, and end sections • Demolish existing riser structure and install new riser structure • Install new 102’ span pedestrian bridge and associated pier structure • Install 190,000 CY of compacted clay for flexible membrane liner placement • Install 3,439,000 SF each of flexible membrane liner and type I & II filter fabric • Place 21,500 CY of #2 stone and 23,000 CY of #57 stone as ballast on the liner slopes • Place 182,000 cubic yards of bottom ash as ballast on the pond bottom