R-9 - July 12, 2018 - Peace River Regional District
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R-9 July 12, 2018
UPDATE
R-9
Further to the SWC recommendation from June 7, 2018, the aerial topographic survey of the Bessborough
Landfill was completed this month and the remaining airspace calculated for Phases 1 and 2. The airspace
in Phase 2 has been consumed and the remaining airspace in Phase 1 was determined to be 26,600m3.
Using disposal and waste compaction rates from 2017, this volume corresponds to approximately the 10
months of remaining airspace in Phase 1 being consumed by the end of March 2019.
Discussions with the Landfill Contractor, Green for Life Environmental, indicated that based on their
experience with the operation and filling of landfills, the top deck of Phase 1 could accommodate an
additional layer or “lift” of solid waste of 3 m thickness.
The Bessborough Landfill closure design consultant, GHD Limited (GHD) was requested to redesign the
final grades for the Phase 1 cell to increase the final elevation and determine the additional airspace
resulting from the minor modification of the final cover grades.
A conceptual design of the modified final grades for Bessborough Landfill Phase 1 prepared by GHD is
provided in the attached Memorandum. The modified final grades for Phase 1 would provide an
additional 20,000m3 of airspace. This additional airspace along with the current remaining airspace would
indicate that the PRRD would have until November 2019 to complete the construction of the Phase 3A
cell. Staff recognized that this would provide sufficient additional time for retendering if possible.
Accordingly, staff submitted a request to modify the final grade design for the closure of the Bessborough
Landfill Phase 1 cell to the Ministry of Environment (MoE) which has been approved.
Staff has also reviewed other options for the site and provide the following information:
" Delaying construction for a year by redirecting waste from the Bessborough landfill to the North
Peace Regional Landfill to provide sufficient time for retendering.
o Primary costs for this option were grouped into two categories:
" Waste from the manned transfer stations/unmanned transfer sites in the South
Peace being trucked into NPRL would be in excess of $450,000 for one year.
" Waste from all customers coming into the Bessborough landfill would be trucked to
NPRL via roll-off bin at an estimated cost of $1,540,000 for one year.
This option is clearly costly to the PRRD as well as impractical. As such, staff does not
recommend this option.
" Surface filling (ie, no excavation, basic grubbing to begin piling waste in cells at existing ground surface)
o When we review the Design and Operations Plan for Bessborough, we note that the leachate
system which is built into the south end of Phase 3 needs to tie into future Phases 4 and 5
(immediately north). Surface filling would cripple the ability of the landfill to manage leachate
without installing additional apparatus in Phases 4 and 5 to pump leachate up to the surface
and tie into the future leachate impoundment system which is destined to manage leachate for
the entire site. Additionally, this action would shave 5-10 years off of the usable life of the
landfill.
Staff did not pursue this option any further as it is not best practice in landfill operations and
construction to hamper airspace capacity and leachate management.
July 12, 2018R-9
The delay of the construction of the Bessborough Landfill expansion project for 2019 will allow ample time
for retendering the construction project. Staff envision splitting the two year construction project into two
separate projects that will be tendered separately in 2018 and 2019 for construction in 2019 and 2020
respectively. It is anticipated that providing significant lead time for contractors to plan for the first project
in 2019 will result in the receipt of bids that are more competitive than what was received when the project
was initially tendered as a two-year construction project. Retendering for construction in 2019 will
encompass the work that absolutely needed to be taken care of in 2018.
CONCLUSION
The chief takeaway from this exercise is that the risk of running out of airspace at the Bessborough landfill
is significantly reduced, allowing for time to build Phase 3A in 2019 instead of 2018 as originally
envisioned. Therefore, staff recommend retendering in 2018 for construction of Phase 3A in 2019.
ALTERNATIVE OPTIONS:
1. That the Regional Board recommend that the Bessborough Landfill Phase 1A/1B and Phase 2
Closure, Phase 3A/3B Expansion Contract No. 13-2018 be awarded to Brocor Construction Ltd. at
the cost of $4,002,811.12 (excluding taxes) and that the Chair and Acting Chief Administrative
Officer be authorized to sign the contract on behalf of the Regional District.
2. That the Board provide alternative direction to staff regarding the award of the
Bessborough Landfill Phase 1A/1B and Phase 2 Closure, Phase 3A/3B Expansion Contract
No. 13-2018.
STRATEGIC PLAN RELEVANCE:
Ensure that the Solid Waste Management Plan is operating on a fiscally defensible basis.
Ensure effective execution of Public Safety and Emergency Services initiatives.
Foster Collaboration on services with municipalities and electoral areas.
Establish a strategy for coordinated advocacy on identified issues.
Manage parks and trails in the region.
Support the agricultural industry within the regional district.
Not Applicable to Strategic Plan.
FINANCIAL CONSIDERATION(S):
The splitting of the construction project into two separate years along with the tendering of each
construction project separately in 2018 and 2019 will provide firm budgetary costs that can be
adequately accommodated in the 2019 and 2020 solid waste budgets.
COMMUNICATIONS CONSIDERATION(S): None foreseen
OTHER CONSIDERATION(S): The Solid Waste Committee met on July 5, 2018 and approved the
recommendations for consideration by the Board:
Attachment: A – GHD Memorandum (Bessborough Landfill: Phase: 1 Conceptual Final Contours
for Increased Capacity).
Page 3 of 3
July 12, 2018R-9
Attachment 1
June 21, 2018
To: Phillip Kovacs Ref. No.: 11102726-
From: David Engstrom/sz/09 Tel: 604-214-0510
C C : D e a c o n L i d d y
Subject: Bessborough Landfill: Phase 1 Conceptual Final Contours for Increased Capacity
1. Introduction
GHD Limited (GHD) has prepared this memorandum to identify options for continuing to landfill in Phase 1
at the Bessborough landfill and delay the construction of Phase 3. Based on discussions with the Peace
River Regional District (PRRD), if sufficient capacity can be identified through a revised final contours plan
for Phase 1, the PRRD would prefer to delay the construction of Phase 1 and Phase 2 final cover and Phase
3 expansion until 2019.
2. Conceptual Final Contours
Design Constraints
The following design constraints from the 2016 British Columbia Landfill Criteria were used to determine
the increase in capacity of Phase 1:
" The maximum slope of final contours must be 3 horizontal to 1 vertical (3:1) to meet
stability requirements.
" Surface water control benches are required every 15 m vertical or less.
" The minimum slope of the plateau must be 10 horizontal to 1 vertical (10:1).
The design constraints included in the Design, Operation, and Closure Plan prepared by AECOM in 2012
allowed 4 percent minimum slopes for the final cover. In accordance with the 2016 British Columbia
Landfill Criteria, the minimum slope must be 10:1 unless the final cover system includes a durable
geomembrane or composite barrier layer with overlying drainage layer. The 10:1 slope will increase the
Phase 1 capacity and will provide improved drainage over a 4 percent slope.
Increase in Capacity and Lifespan
Revised conceptual final contours for Phase 1 are shown on the sketch in Attachment A. The top of the 3:1
slope was increased from approximately elevation 855 m to elevation 866 m, which was the maximum
GHD
10271 Shellbridge Way Suite 165 Richmond British Columbia V6X 2W8 Canada
T 604 214 0510 F 604 214 0525 W www.ghd.com
July 12, 2018R-9
Attachment 1
vertical height allowed so that surface water control benches are not needed. The 10:1 slope of the plateau
raised the final contours from approximately elevation 856 to elevation 859. The increased waste capacity of
Phase 1 was estimated to be approximately 20,000 m 3.
The annual surveys in 2017 and 2018 indicated an airspace utilization of 35,412 m 3 over 400 days. The
average monthly (30-day) consumption rate based on the surveys is 2,655.9 m 3. At this rate of consumption,
the estimated increase in Phase 1 lifespan would be approximately 7.5 months.
3. Conclusions
The capacity of Phase 1 can be increased by 20,000 m3 using the conceptual design sketch shown in
Attachment A. Phase 1 was expected to reach capacity in April 2019 as estimated in the 2015 Annual Report
prepared by GHD. The increased lifespan for Phase 1 would delay this until November 2019; therefore, the
expansion of Phase 3, or portion thereof, could be delayed until the June to October construction season in
2019.
2
July 12, 2018
11102726Memo-09R-9
Attachment 1
Att achment A
Sketch of Revised Conceptual Phase 1 Final
Contours
GHD | 11102726Memo-09-ATT-TPs
July 12, 2018R-9
X LEGEND
PROPERTY LINES
845 CONTOURS (m AMSL)
EXISTING LANDFILL LIMIT OF WASTE
FENCE LINE
MAINENTRANCE
Attachment 1 U.P .
CULVERTS
UTILITY POLES
GHDLimited
841
L. S .
LIGHT STANDARDS
BM#1 10271 Shellbridge Way Suite 165
PHASE 3 SURVEY CONTROL POINT
Richmond British Columbia V6X 2W8 Canada
845 PROPOSED CONTOUR (m AMSL) T 604 214 0510 F 604 214 0525 W www.ghd.com
.
P
PROPOSED FENCE LINE
POND PROPOSED DITCH
BM#1
LIMIT OF FINAL COVER
PROPOSED SPOT ELEVATION
/GRADE BREAK
A'
X
WASTETRANSFER SECTION LOCATION
STATION C-06
LS
..
Reuse of Documents
PHASE 1 PERIMETER This document and the ideas and designs incorporated herein, as an instrument of
C-06
DITCH #1
B
BM#3 professional service, is the property of GHD and shall not be reused in whole or in part for
WHITEGOODS SEE DETAIL BESS-BH103 any other project without GHD's written authorization. © 2016 GHD
UP
..
1
SCALE HOUSE PROPOSED DITCH C-16 PROPOSED DITCH BESS-BH102
UP
.. 0 000
AND SCALE PROPOSED DITCH PROPOSED DITCH WITH TRM BESS-BH101PROPOSED DITCH
U.P. 32.88m @ 1.1% PHASE 1 LANDFILL WITH TRM 152.34m @ 1.4% 58.0m @ 2.2%
ACCESS ROAD WITH TRM
LS
.. 175.03m @ 2.8%
22.0m @ 4.7%
UP
.. 0 025
U.P U.P. SEDIMENT
UP
..
LS
.. UP
.. FOREBAY
UP
..
PROPOSED 16.75m 300mmØ UP
..
LS
.. BESS-BH106
HDPE CULVERT @ 1.6% SEE
DETAIL BESS BH107 0 10 20 30m 100.0 1
CONNECTION TO
13 0 050
LEACHATE STORMWATER
POND
SCRAPTIRES C-17 STORAGE
BASIN
PROPOSED DITCH
WITH TRM
PROPOSED DITCH 21.75m @ 3.5%
0 075
102.00m @ 1.0%
PROPOSED DITCH
WITH TRM
A Cle
i nt
A' 28.67m @ 3.9%
UP
..
C-06
0 100
C-06
PEACE RIVER REGIONAL DISTRICT
DAWSON CREEK, B.C.
0400
0425
0450
0000
0025
0050
0075
0200
0225
0250
0275
0300
0325
0350
0375
0100
0125
0150
0175
BESS-MW7
859 LANDFILL Project
858 PHASE1
0 125 LEACHATE PUMPING ACCESS BESSBOROUGH LANDFILL
857 PIPE. EXTEND AS REQUIRED TO
EXECUTE WORKS PHASE 1 & 2 CLOSURE AND
856 PHASE 3 EXPANSION
BESS-MW3A
BESS-MW3
0 150 PROPOSED DITCH
176.08m @ 0.6%
BM#2
0 175 2 90% DESIGN REVIEW D.C. D.L. 10/30/2017
PHASE1BOUNDARY NOTE:
LANDFILL GAS RELIEF DITCH SEGMENTS WITH 1 50% DESIGN REVIEW D.C. D.L. 08/24/2017
VENT (TYP.) SLOPES GREATER THAN 2%
PHASE 1 PERIMETER SEE DETAIL TO BE LINED WITH TRM.
UP
..
PROPOSED DITCH No. Issue Drawn Approved Date
53.29m @ 2.5% PROPOSED DITCH
DITCH #2
SEE DETAIL 19
WITH TRM 0 200 C-18
PROPOSED DITCH BESS-MW6 129.37m @ 2.7% 2 Drawn D. CORKILL Designer D. CORKILL
132.19m @ 1.7% C-16
PROPOSED FENCE
Drafting S. STURGEON Design
Check Check S. STURGEON
C-06
B'
Project D.LIDDY Date Jul31,2017
Manager
This document shall not be used for
construction unless signed and sealed Scale 1:1_1
for construction.
Original Size
Bar is 20mm on original
ANSI D 0
size drawing
20mm
SW 1/4
SECTION 5
ProjectNo. 11102726-0020
Ttie
l
Sketch of Revised Conceptual Phase 1 Final Contours PHASE 1 GRADING PLAN
TOP OF FINAL CONTOURS
SheetNo.
C-06
Sh e et 7 o f 20
Plot Date: 15 December 2017 - 10:12 AM Plotted By: Dylan Corkill CAD File: I:\CAD\8-chars\11------\1110----\111027--\11102726\11102726-REPORTS\11102726-0020(004)\11102726-0020(004)CI\11102726-0020(004)CI-OT005.dwg
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