Landfill Gas Update

Jefferson Parish Sanitary Landfill

Jefferson Parish, Louisiana

November 6, 2019

PRESENTATION OUTLINE

• Status update on LFG system expansion project at JPSL

• Accomplishments to-date, what is planned, and timelines

• Methodology for LFG-related odor reductions during construction

• Future plans

PERFORMANCE OBJECTIVES

• Drivers for upgrading the existing LFG system per CEC’s scope

• Defined in meeting on March 7, 2019 by Jefferson Parish as:

1. Regulatory Compliancea. New Source Performance Standards (NSPS) – Air Regulations for LFG Systems

b. Solid Waste Permit and Air Permit

c. LDEQ Site Inspections and Coordination

2. Safetya. Employees, Contractors, & General Public

b. Combustible gases (CH4), hydrogen sulfide (H2S) gases

3. Odor Reduction (landfill gas derived odors)a. Potentially uncollected landfill gas and hydrogen sulfide gases

4. High-BTU LFG Recovery for Renewable Natural Gas Productiona. Medium BTU to High BTU operation change – increased $ for LFG sales

b. Renewable Energy of Jefferson, LLC (REJ)

LFG SYSTEM UPGRADE TIMELINE

• Parish Resolution No. 133036 dated 2/6/19 – Authorized CEC to prepare conceptual LFG design

• CEC Report – High BTU Landfill Gas Utilization Plan - Final Dated 5/7/19

• Parish Resolution No. 133573 dated 5/8/19 – Authorized River Birch, LLC to begin LFG operations and maintenance on the Jefferson Parish wellfield on 5/15/19 (LFG system assessment)

• Parish Resolution No. 133986 dated 7/24/19 – Authorized CEC to prepare Stage 1 construction plans and assist with bidding (Refine)

• Parish Resolution No. 134447 dated 10/2/19 – Authorized Renewable Energy of Jefferson, LLC (REJ) funds to construct the Stage 1 LFG system expansion in PHIVA and PHIIIB

• Parish issues Notice to Proceed on 10/8/19 to REJ (Materials Order)

• 10/16/19 – Coordination agreement between REJ and Louisiana Regional Landfill Company on Waste Filling & LFG system expansion

• 11/11/19 – Stage 1 LFG system construction start

COMPLETED LFG SYSTEM IMPROVEMENTS

September 2018 to April 2019 – Improvements performed

▪ More leachate pump stations operational - 90%+▪ 16 new or re-drilled vertical gas wells▪ 32 wells had new air/forcemain lines & pumps installed▪ 5 leachate risers connected to the active gas system▪ Blower/flare station upgrades▪ Dual 10” liquids forcemain system installed around PH

IIIB/IVA – liquids handling infrastructure▪ Additional normal repairs and temporary infrastructure that

is typical of a large MSW landfill with an active LFG system

COMPLETED LFG SYSTEM IMPROVEMENTS

May 2019 to November 2019 – Improvements performed

• LFG system assessment by River Birch, LLC• Need more pumps, air/FM upgrades, wellheads

• Focus on dewatering gas wells and leachate system• Improved air supply in PHIVA – pumps operational• Repairs to condensate sumps – improved LFG system vacuum

= improved LFG recovery• Focus on wellhead integrity and lowering air intrusion• Stage 1 LFG system expansion designed, approved, bid, and

construction planned• New 8 horizontal gas collectors in PH IVA to be installed in

November/December 2019

IMPROVEMENTS TO LFG RECOVERY

• May 2019 ~ 988 SCFM

• June/July 2019 ~ 1,100 SCFM

• August/September 2019 ~ 1,200 SCFM

• October/November 2019 ~ 1,400 SCFM

• 11/5/19 = 1,438 SCFM

• ~450 SCFM increase since May 2019 (~45%

increase)

*Data provided by River Birch, LLC – figures shown are averages as LFG flow fluctuates.

STAGE I - LANDFILL GAS TEAM

• Jefferson Parish – Landfill Owner

• Louisiana Regional Landfill Company – Landfill Operator

• Renewable Energy of Jefferson, LLC – LFGTE Operator

• River Birch, LLC – LFG System O&M Contractor

• Tricon Works, LLC – LFG Installation Contractor

• Dufrene Surveying & Engineering, Inc - Surveyor

• Carlson Environmental Consultants, PC – Engineer & CQA

JEFFERSON PARISH LANDFILL – SITE MAP

HIGH BTU OVERLAY LFG SYSTEM DESIGN

FINAL STAGE I LFG SYSTEM DESIGN

STAGE I LFG EXPANSION SUMMARY

▪ 64 new or re-drilled vertical extraction gas wells▪ Well bore seals on all vertical wells – to help reduce odors▪ Stainless steel wellheads with new down well liquid pumps▪ 52,000+ feet (10+ miles) of piping (gas, air, liquid)

▪ 100% new gas piping and air/FM infrastructure in PHIVA▪ 30% new gas piping and air/FM infrastructure in PHIIIB

▪ Three (3) new condensate sumps▪ 16 new leachate cleanout connections for gas recovery▪ 5,000+ feet of horizontal gas collectors and perimeter drains▪ A 200 SCFM@150 psi air compressor and refrigerated dryer

system

STAGE I LFG UPGRADE - PHASES IIIB & IVA

I. Stage 1 LFG Construction Begins – 11/11/2019

II. Phase IVA Supplemental 8 Horizontal Collectors Installed –

11/11/2019 to 12/10/2019

III. Start-up of 8 supplemental horizontal collectors – 12/11/2019 to

3/11/2020

IV. Well Drilling for NE Corner Stage 1 – 11/11/19 to 12/10/2019

V. Piping for NE Corner Stage 1 – 12/11/2019 to 3/30/2020

VI. Waste filling begins in Cell 24 South and Cells 21 to 23 are clear to

begin LFG construction – 1/31/2020

VII.Complete NE Corner Stage 1 LFG System – 3/30/2020

VIII.Start-up NE Corner Stage 1 LFG System – 4/1/2020 to 7/1/2020

IX. Well Drilling for SW Corner Stage 1 – 3/31/2020 to 4/24/2020

X. Piping for SW Corner Stage 1 – 4/25/2020 to 10/31/2020

XI. Complete SW Corner Stage 1 – 10/31/2020

XII.Start-up SW Corner Stage 1 LFG System – 11/1/2020 to 2/2/2021

ESTIMATE STAGE GAS RECOVERY AND LFG SYSTEM UPGRADE COSTS

STAGE 1Original

STAGE 1Final

Location Phases IIIB/IVA Phases IIIB/IVA

Estimated Range of LFG Recovered (SCFM) in 2019

1,178 – 1,767 1,178 – 1,767

Estimated Cost ($) ~$3,454,450 ~$5,000,000

Schedule (months) 9-12 12-15

LFG CONSTRUCTION COSTS AND TIME

Costs increased from CEC’s 5/8/19 Stage 1 estimates due to the following:1. Following the River Birch LFG assessment in June/July 2019,

more infrastructure was determined to be unusable and in need of replacement in PH IVA.

2. More pumps, spare parts, and spare pipe was included in the revised Stage 1 project – existing site does not have sufficient spare parts to make repairs

3. Increased health and safety costs to cover potential hydrogen sulfide gas concerns in PH IVA

4. Increased contingency budget

Time was increased to allow for the increased scope and 90-day start-up periods following the end of construction. Goal is to expedite construction and start-up

LFG CONSTRUCTION MANAGEMENT

• The Stage 1 LFG Construction will be managed by River Birch, LLC and their construction contractor Tricon with Construction Quality Assurance (CQA) and Owner’s Management provided by CEC and Parish personnel.

• Project will be paid on a unit-cost billing structure in which contractor is paid per unit installed (i.e., vertical foot of gas well drilled, wellhead installed, pipe foot installed, etc.)

• CEC/Parish will be reviewing the installed quantities and comparing these figures with the construction invoices and using surveying information to provide confirmation.

• Goal is to complete within the approved budget (or below) –acknowledging that there are unknown factors that may increase costs and many areas that can be improved – primary reason for the Contingency Budget built into the Project

LFG CONSTRUCTION ODOR REDUCTION TECHNIQUES

These techniques are considered Best Management Practices (BMPs) for LFG construction odor reduction:1. Maximize the operation of the existing LFG collection system –

the existing system will stay in operation during construction and will not be decommissioned until the new system is started

2. Install new/temporary LFG collection devices to aid in LFG recovery during construction (i.e., 8 horizontal gas collectors)

3. Limit exposed waste and pathways for LFG-odors to escape during construction (i.e., trenches, holes)

4. Cover all open holes and trenches overnight and when not undergoing active construction with tarps, plywood, and/or soil

5. Use a vacuum box to help lower LFG-odors during gas well drilling

6. Maintain use of existing odor neutralizing mist system in PH IVA and PH IIIB

EXAMPLE DRILLING VACUUM BOX

FUTURE PROJECTS

▪ Install new down well pumps and upgraded wellheads on target wells while Stage 1 project is on-goingo Maximize liquids removal and gas recovery

▪ Work (at some level) needs to be performed on PH I, PH II, and PH IIIA – CEC’s original recommendations were noted in Stages 2, 3, and 4 – Plan is to review these in early 2020o These areas have lower gas generation and recovery than PH IVA/PH

IIIB, but have significant needs with infrastructure, dewatering capacity, and meeting regulatory compliance

o Stages 2, 3, and 4 targeted highest yield areas of each phase ~60%▪ Develop LFG Master Plan and long-term LFG budgeting▪ Develop Solid Waste Master Plan▪ Upgrade the landfill liquids handling system and treatment options

THANK YOU