PRJ 17039 Cobble Hill Landfill

2017 Minor Construction Works

P R O G R E S S R E P O R T  

 

 

CONSTRUCTION PROGRESS REPORT – 2017 Minor Construction Works

Project: Cobble Hill Landfill – Closure Plan Date: September 21st, 2017 Subject: Construction Progress Update Location: Cobble Hill Landfill File: 17039-2017-01 Report Distribution:

SHA: Scott Garthwaite, Tony Sperling CHH: Michael Kelly, Marty Block Allterra Construction: Todd Mizuik, Raymond Lam GHD Limited: Reinhard Trautmann MoE: Maureen Bilawchuk, AJ Downie

The following description of work includes construction progress from September 18th – 21st, 2017 onsite at the Cobble Hill Landfill. Additionally, work tasks scheduled for the following week is outlined. A photo log of construction activities is provided in Appendix A along with description of the work. Construction Activities: September 18th, 2017:

Allterra Construction completed detailed site orientation / safety meeting with all personnel, operators and laborers.

3x loads (approx. 20m3/load) of contact water was withdrawn from the Contact Water Pond and hauled away to a licensed facility for disposal. Chain of Custody to be provided by Allterra for record files.

Allterra Construction determine a suitable location for new Leachate Storage Facility approximately 65-70m north of the PEA. Excavation for the new facility was completed.

September 19th, 2017:

Subgrade for Leachate Storage Facility was completed with compacted lifts consisting of a 100mm of 5-12.5mm layer of clear crush drain rock overtop of a 150mm layer of 2-3” clear crush drain rock.

Lock block installation for new Leachate Storage Facility was initiated.

Chain Link perimeter fencing around Contact Water Pond was removed.

PRJ 17039

C O N S T R U C T I O N P R O G R E S S M E E T I N G  

 

File No. 17039‐2017‐01 – Construction Update   September 21st, 2017  Page 2 of 3 

Clean Fill material stockpiled adjacent to Contact Water Pond for backfill.

Waste bins onsite for Contact Water Pond Liner removal.

100mm HDPE DR 17 leachate / leak detection piping arrived onsite and was inspected for approval.

PEA Liner inspection was completed by SHA. 4 small holes were identified and location noted on the attached Figure-1 for future repair work.

September 20th, 2017:

3x loads (approx. 2x 20m3/load and 1x 10m3/load) of contact water was withdrawn from the Contact Water Pond and hauled away to a licensed facility for disposal. Chain of Custody to be provided by Allterra for record files. All contact water now removed from pond.

A small amount of silty sediment on the liner base was removed and stockpiled in the SMA facility for containment and tarping along with the other existing soil in the SMA.

The existing liner in the Contact Water Pond was cut and folded and disposed of into the refuse bins for disposal at an offsite facility.

Contact Water Pond was subsequently backfilled with clean fill and compacted in lifts.

Lock Block enclosure at new Leachate Storage facility was completed to 4 lock blocks high and backfilled around the outside perimeter with 6” clear crush drain rock.

Photos of Construction Activities are presented in Appendix A, attached. Schedule of Upcoming Works: Construction is on schedule and completion of all 2017 Minor Construction Works is anticipated for the end of next week. Below is an outline of the remaining works to be completed.

Lock Block enclosure to be completed this week including protective layers for secondary liner containment. 4 rows of lock blocks are in place with the additional 2 rows (6 rows total) scheduled early next week.

SMA soil management works is scheduled to commence this week and be completed by mid next week.

Trenching of leachate / leak detection piping will commence early next week. Subsequent piping install will follow.

Installation of secondary liner in lock block enclosure and installation of tanks will commence early next week.

Removal of existing leachate / leak detection tanks will begin mid next week.

Roof structure and alarm system for new Leachate / Leak Detection Tanks will commence mid next week.

PRJ 17039

C O N S T R U C T I O N P R O G R E S S M E E T I N G  

 

File No. 17039‐2017‐01 – Construction Update   September 21st, 2017  Page 3 of 3 

Test pitting and PEA secondary clay liner investigation will take place next week.

3x shallow monitoring wells north of PEA toe will be completed next week.

PEA liner repairs are schedule for next week.

PEA ditch liner ballasting is scheduled for next week.

South run-on ditching is scheduled for next week. Please respond with any question or concerns regarding the above outlined construction activities or upcoming scheduled works. Report prepared by: Sperling Hansen Associates Scott Garthwaite, AScT Office Manager

Figure 1 – PEA Liner Investigation - attached Appendix A - attached

APPENDIX A Photo Log of Construction Activities

Cobble Hill Landfill Closure – 2017 Minor Construction Works 

 

Leachate / Leak Detection Storage Facility: 

 

Photo 1 – Leachate / Leak Detection Storage Facility Location.   

 

Photo 2 – Lock Block Delivery 

 

Photo 3 – Subgrade and Lock Block Placement 

 

Photo 4 – Lock Blocks installed 4 rows high and 6” clear crush backfill commencing around exterior of 

enclosure. 

 

Photo 5 – Additional granular backfill around lock block enclosure with separation geotextile placed 

overtop of 6” clear crush backfill. 

 

Photo 6 – 5‐12.5mm clear crush base gravel within the lock block enclosure raked and compacted for 

secondary liner system install. 

 

 

 

 

 

Contact Water Pond Decommissioning: 

 

Photo 7 – Contact Water Pond – Perimeter fencing removed and preparation for further 

decommissioning works. 

 

Photo 8 – Backfilling of contact water pond. 

 

Photo 9 – Contact water pond decommissioning complete 

PEA Liner Investigation: 

 

Photo 10 – Small hole identified in PEA liner along western edge. 

 

Photo 11 – Small hole on existing extrusion weld identified along northwest corner of PEA liner. 

 

Photo 11 – 3x small pin holes identified in northwest corner of PEA liner. 

 

Photo 12 – Small hole identified along eastern toe of PEA liner. 

100mm HDPE DR 17 Pipe: 

 

Photo 13 – HDPE Pipe delivered to Site. 

 

Photo 14 – Inspection and Approval of HDPE DR 17 Pipe for Leachate / Leak Detection Conveyance. 

SMA Soil Management: 

 

Photo 15 – Soil in SMA being cleanup and consolidated into central windrow for eventual tarping / 

containment.