Innovations in Recapping an Industrial Landfill

Transcription

1 1 Innovations in Recapping an Industrial Landfill Strive for Sustainability Conference Sue Lasdin Momberger, P.E., NYSDEC Division of Materials Management with Dan Lang, Principal Hydrogeologist / Associate VP, Arcadis US, Inc May 4, 2015

2 2 Innovations in Recapping an Industrial Landfill New Case Study: Recapping CKD Landfill w/ Artificial Turf Why Recap a Landfill Some Cap Integrity O&M Concerns DEC Capping / Recapping Requirements Recapping Project Goals Recapping Project Activities Other Questions?

3 New Case Study: Recapping CKD Landfill w/ Artificial Turf Former Holcim Cement Facility, Catskill, NY Cement plant closed in 2012 Plant demolition completed November 2014 Recapping of Former Cement Kiln Dust (CKD) Disposal Area Main cell - ~34 acres; East cell - ~6 acres Originally approved for compacted-ckd cap system Closed in 2004 under NYSDEC Consent Order O&M included treating 150K gallons/day leachate 3

4 Why Recap a Landfill Lifespan exceeded ( years) Loss of integrity due to inadequate O&M o Excessive leachate to treat Environmental impacts o o Leachate seeps Groundwater / surface water / soil contamination Upgrade pre-part 360 Cap to be more protective & save $ o o Less rainwater infiltration, less leachate treatment Potentially decrease O&M costs 4

5 Some Cap Integrity O&M Concerns Ponding or tears due to settling of wastes / loss of liquids in drums / earth movement Cracking or erosion due to fluctuations in air temperature / precipitation / humidity Holes caused by plant roots / burrowing animals Degradation from sunlight / Chemical and biological degradation Human activities: Excessive traffic / Vandalism Pre-current Part 360 caps may have been unlined or were highly permeable 5

6 DEC Capping / Recapping Requirements Compliance: Part 360 version in effect when landfill was constructed, or Enforcement mechanism, e.g., consent order, or Variance granted by DEC Central Office, for current Part 360 landfills Approval Documents, sent to DEC Regional Office: Permit & Variance Applications & Conceptual Closure Plan Final Closure Plan or Closure Plan Modification (Recap) (and Variance Application if not submitted with Permit Application) 6

7 7 Recapping Project Goals Reduce infiltration at the CKD disposal area that recharges the leachate mound in the waste mass. Re-grade landfill to improve drainage off of the recapping system Eliminate groundwater flow through waste mass. Accelerate leachate mound decay with supplemental leachate recovery wells Consolidate residual raw rock, inert materials and partially processed products prior to recapping

8 8 Recapping Project Activities Approval of Closure Plan Modification o Justification included demonstration of design equivalency to current Part 360 requirements, and acquiring financial assurance for post-closure O&M Upgrade of the CKD disposal area cap to replace inefficient compacted CKD cap Installation of a slurry wall to cut-off groundwater underflow Storm water improvements Supplemental leachate recovery

9 Site Model 9 EAST CELL DIVERGING FLOW Swan Pond

10 10 East-West Cross Section.

11 Components of Remediation 11 Leachate Treatment Removal Areas Swan Pond Coal Removal

12 12 June-July Slurry Wall Installation Slurry Wall Characteristics 2,700 feet long Conventional trenching Bentonite-clay-slag mix Keyed into native clay Depth range 12 to 40 feet

13 13

14 Cap Upgrade - Geomembrane and Subgrade Prior to Deployment 14

15 Geomembrane Subgrade at On-cap Swale 15

16 Geomembrane Liner Deployed Through On-cap Swale 16

17 Sewing Prayer Seam on Turf Layer 17

18 Broadcast Spreader Deploying Sand Ballast 18

19 Sand Ballast Deployment with Sand Slinger and Brooming 19

20 Overview of Liner and Turf Deployment 20

21 Installing HydroBinder 21

22 Hydrating HydroBinder 22

23 23 July 2014

24 24 August 2014

25 25 September 2014

26 26 October 2014

27 27 November 2014

28 28 April 2015

29 29 Other Questions? Also feel free to call me or me: Sue Lasdin Momberger, P.E. NYS DEC Division of Materials Management Bureau of Permitting and Planning Beneficial Use, Medical Waste & Inactive Landfills Section