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Parametrix
ENGINEERING. PLANNING. ENVIRONMENTAL SCIENCES
A
EXHIBITA-AMENDMENT TWENTY-SIX
Grant County
FY 2023 Ephrata Landfill
Engineering and Environmental Services
INTRODUCTION
Parametrix, Inc. (Parametrix), is currently providing engineering and environmental services for Grant County
Public Works Department (County) at the New Ephrata Landfill (New Landfill) and Closed Landfill (old Landfill).
Parametrix is responsible for completion of the tasks below and will utilize County staff to perform specialized
services as needed. This scope and budget amendment is based on our conversations with County staff,
Parametrix experience at the site, and continued development of the New Landfill. The County has requested
Parametrix conduct additional tasks for the New Landfill and Old Landfill through fiscal year (FY) 2023 as listed
below. The budget is attached as Exhibit B.
PHASE08 — 2023 EPHR.A'TA-.-,,LANDFILL ENGINEERING AND ENV RONMENTAL SERWC
Task J. --Project Management
Task 2 — Groundwater Compliance Monitoring
Task 3 — Landfill Gas Operations, Monitoring, and Reporting
Task 4 — On -Call Engineering and Environmental Consulting Services
0 Task 5 — Financial Assurance Reporting Assistance
0 Task 6-- Long -Term Disposal Options Study
Task 7 — Pavement Design for Entrance Improvements
0 Task 8 — Phase 4 Development Design
Accordingly, this amendment increases the scope of work and budget to include the additional tasks.
Approved for CLIENT
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By
Accepted for PARAMETRIX, INC.
By
Title Rob Jones, Chair Title Roger_W. Flint, Chief Operating Officer
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Date Id -5
Grant County
FY 2023 Ephrata Landfill
Engineering and Environmental Services
Date 4/18/2023
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555-3746-001
April 2023
EXHIBIT A —AMENDMENT TWENTY-SIX (continued)
PHASE 08 - 2023 EPHRATA LANDFILL ENGINEERING AND ENVIRONMENTAL SERVICES
Task 1 — Project Management
Task Leader: Dwight Miller, PE
Approach
Throughout the course of the contract, Parametrix will provide effective project management and coordination to
execute the scope of work within budget and schedule,, meeting the County's expectations for content and
quality.
Project management activities will include:
• Updating the internal Project Management Plan, including a Quality Control Plan.
Managing project activities.
• Preparing monthly invoices accompanied by a project status report.
• Administering subcontractor agreements.
• Coordinating, scheduling, and participating in project meetings, including preparation of meeting notes.
Invoices and project status reports will include:
0 Itemization of costs by task.
• Budget status by task.
• Estimate of percent complete by task,
• Backup information for invoiced costs.
Project management is assumed to occur from January 2023 through December 2023.
Deliverables
• Monthly invoice and status reports (PDF)
• Project meeting notes (PDF)
• Periodic schedule updates (MS Project or PDF)
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Task Leader: Alla Skaskevych (Mott MacDonald)
Background
The County is required under Washington Administrative Code (WAC) 173-351 to collect groundwater samples
quarterly from solid waste monitoring wells surrounding the Old Landfill and New Landfill as outlined in the
August 2019 Environmental Monitoring Plan.
The County is also required to submit quarterly and annual groundwater monitoring reports to Washington State
Department of Ecology (Ecology) and Grant County Health District (GCHD). Mott MacDonald, as a subcontractor
to Parametrix, will assist the County in collection of samples through fourth quarter 2023 and produce four
quarterly reports and the 2022 annual report, Mott MacDonald and the County will each provide one person for
Grant County 555-3746-001
FY 2023 Ephrata Landfill 2 April 2023
Engineering and Environmental Services
EXHIBIT A — AMENDMENT TWENTY-SIX (continued)
each sampling round, Mott MacDonald will continue to manage the water quality database and generate reports.
Mott MacDonald will also submit quarterly groundwater data results to Ecology's Environmental Information
Management (EIM) database as required by WAC 173-351.
Solid waste landfill groundwater sampling work for the Old and New Landfills occurs at the same time, and the
reports are combined; however, work on the Old and New Landfills will be separated on invoices based on a
standardized percentage of effort.
Approach
Task 2.1 — Maintain Database for through 2023
Mott MacDonald will work directly with Analytical Resources Inc. (ARI) of Seattle to receive groundwater
monitoring data in standardized electronic digital format. Data will be reviewed for quality and entered into Mott
MacDonalds g(oundwater monitoring database for the Ephrata Landfill. This budget also includes loading
monitoring data into Ecology's EIM database. Data will be entered for all wells sampled in each sampling event
through 2023. The County will be provided a complete copy of the data upon request.
Task 2.2 — Assist County to Collect Groundwater Samples during Four Sampling Rounds
Mott MacDonald will work with the County to collect groundwater samples during four sampling rounds (through
fourth quarter 2023). Mott MacDonald will order bottles and help County personnel operate the pumps, collect
samples, measure field parameters, measure water levels, and transfer samples. We anticipate each sampling
round to take two long field days plus travel time. Mott MacDonald will coordinate with the lab and include lab
invoices in project billings. The County will maintain pumps and other County -owned field equipment.
Task 2.3 — Prepare and Submit Four Quarterly Reports
Mott MacDonald will generate four quarterly reports combined for both the Old and New Landfills, beginning in first
quarter 2023 and ending fourth quarter 2023. Reports will conform to the requirements of WAC 173-351-415(2).
Task 2.4 — Prepare and Submit 2023 Annual Report
Mott MacDonald will generate the annual 2023 report combined for both the Old and New Landfills. Reports will
conform to the requirements of WAC 173-351-415. The annual report is due by April 1, 2024,
Task 2.5 --Task Management
The task management task includes costs associated with Mott MacDonald invoicing and personnel management
and communication.
Task 2.6 — Pump Replacement Support
As requested by the County, Mott MacDonald will assist in replacing or coordinating maintenance on
groundwater sampling pumps and appurtenances. This task will be specified upon request and may include
elements of pump removal, sourcing replacement equipment from vendors., and troubleshooting.
Deliverables
Mott MacDonald, under contract to Parametrix, will prepare and submit four quarterly reports and one annual
groundwater monitoring report, which will be forwarded to Grant County Health District and to Ecology.
Grant County 555-3746-001
FY 2023 Ephrata Landfill 3 April 2023
Engineering and Environmental Services
EXHIBIT A — AMENDMENT TWENTY-SIX (continued)
Task 3 — Landfill Gas Operations, Monitoring, and Reporting
Task Leader: Drew Norton, EIT
Approach
Task 3.1 — Landfill Gas Monitoring and System Operational Support
Parametrix will monitor the landfill gas collection system, including flare facility, and the gas probes during four
rounds in 2023 on a quarterly basis. Parametrix will generate one annual letter report for 2023 combined for both
the Old and New Landfills' landfill gas collection systems and gas probes, in accordance with the Notice of
Construction (NOC) Approval Order No. 19AQ-EO51, as well as summarize past landfill gas probe monitoring
conducted by Parametrix.
Parametrix will assist County staff in operating and maintaining the active landfill gas system, following the
guidance provided in the Active Landfill Gas Operations and Maintenance Manual. Parametrix will provide
guidance to safely and effectively operate the Ephrata Landfill gas collection system that will help control landfill
gas from migrating around the Old Landfill and emitting from the New Landfill.
The system operations monitoring will include and be based on the following:
Changes in landfill gas constituent concentrations and flow rates over monthly time intervals
• Operations and maintenance of the landfill gas system, with the exception of County -performed greasing
and blower switches on a 3 -week schedule
• Performing routine inspection's and maintenance of the gas system
• Monitoring individual trench/well wellheads for pressure, methane, oxygen, carbon dioxide, temperature,
and flow
• Adjusting individual wellhead flows to reach stable operation and/or generation flows
• Calibrating monitoring equipment
The Active Landfill Gas Operations and Maintenance Manual will be used as a reference and training guide to
operate and maintain the gas collection system. Parametrix will assist the County in the proper operation and
data collection required to satisfy greenhouse gas regulations.
We anticipate each landfill gas monitoring round to take one field day plus travel time and reporting. The County
will supply the landfill gas meter (Landtech Gem500) to monitor for methane, oxygen, carbon dioxide, and
pressure.
We anticipate that the landfill gas system will be in stable operation. Landfill gas system stability will be evaluated
based on the following:
• Changes in landfill gas constituent concentrations and flow rates over monthly time intervals
• Changes in landfill gas temperature at individual collection points (e.g. wellheads)
• Changes in overall volumetric flow and flows from individual collection points
Landfill gas system operational stability will be characterized by little change in the above parameters over
significant time intervals (e.g,, monthly) or steady, predictable data trends.
Grant County
555-3746-001
FY 2023 Ephrata Landfill 4 April 2023
Engineering and Environmental Services
EXHIBIT A —AMENDMENT TWENTY-SIX (continued)
Task 3.2 — Title V Air Quality Operating Permit Annual Reporting
The Title V permit application for the Ephrata Landfill is currently in draft phase with Ecology. Once issued, the
permit will require annual reporting of landfill operations. Parametrix will provide the following to assist the
County with compliance of the new requirements outlined in the draft permit:
a Provide assistance on any deviations throughout the year.
• Prepare permit condition forms using Ecology Air Quality templates that communicate activities during
the year.
• Train County.staff on proper permit condition reporting and compliance (assumes one site visit).
• Update the landfill gas system overall site plan in accordance with Title V Operating Permit.
0 Prepare annual report in accordance with the Operating Permit conditions. Submit electronic copies to
the County for review, and submit final electronic files to the County for delivery to Ecology Air Quality
Program via email at Emissions.inventorv@ecy.wa.gov by January 31. Each report will communicate
year-to-date permit condition activities during the year.
The 2023 Annual Report is due on January 31, 2024. The 2024 Annual Report will be prepared under the FY 2024
engineering services scope of work.
Task 3.3 — Title V Flare Improvements
Parametrix will provide plans, specifications, and construction support for the installation of monitoring and
recording infrastructure required for compliance with 40 Code of Federal Regulations (CFR) Subpart XXX
Section 60.766(c) to:
a. A heat sensing device, such as an ultraviolet beam sensor or thermocouple, at the pilot light or
the flame itself to Indicate the continuous presence of aflame.
b. A device,,,that records flow to the flare and bypass of the flare (if applicable). The owner or
operatormust:
i. Install, calibrate., and maintain a gas flow rate measuring device that records the flow to
the control device at least every 15 minutes.
The effort includes time for one site visit by a senior electrical engineer during design as well as two 8 -hour days
on-site during construction for a systems integrator to integrate the new monitoring and recording infrastructure.
It is assumed that the installation of monitoring and recording equipment will be performed by an electrical
contractor selected through a public bidding process. Bid and construction support will be provided by Parametrix
staff.
Deliverables
0 A summary of landfill gas collection system and probe monitoring data, which will be forwarded to GCHD
and Ecology.
• One annual report for communicating Title V Operating Permit activities, deviations, and compliance
reporting. The report is due to the County for review by January 20, 2024, and to Ecology via the County
by January 31, 2024.
• Contract documents for flare improvements and bid and construction support documentation. This will
include one draft and one final bid document package.
Grant County 555-3746-001
FY 2023 Ephrata Landfill 5 April 2023
Engineering and Environmental Services
EXHIBIT A —AMEN DMENT TWENTY-SIX (continued)
Task 4 — On -Call Engineering and Environmental Consulting Services
Task Leader: Dwight Miller, PE
Approach
Parametrix will assist County staff, if requested by the County, in responding to operations, design, and regulatory
issues that arise during the contract period.
Parametrix will assist the County in continuing landfill operations and future development of the New Landfill in
accordance with current and approved Ephrata New Landfill Permit Application Phases 1 through 4
(Parametrix 2020). This work is assumed to consist of communications (both written and oral) with the County
staff concerning site operations and development. This work is anticipated to require about 8 hours per month,
with -time and travel expenses included for four field visits or meetings between a Parametrix Project Manager or
Engineer,, Agencies, and County staff in Ephrata.
Additional on-call services may include the development of a Landfill Gas to Energy Feasibility Study. As directed
by the County, Parametrix will prepare a detailed scope of work and budget once the landfill gas generation for
the New Landfill has stabilized. A general allowance of 120 engineering hours has been preliminarily allocated for
this subtask.
Parametrix support will remain within the available task budget unless additional task funds are authorized.
Deliverables
Meeting notes and other correspondence in support of the landfill operation
1,V
Task 5 — Financial Assurance Reporting Assistanoa,
Task Leader: Dwight Miller, PE
Background
WAC 173-351 requires the preparation of detailed closure capital and post -closure operations and maintenance
(O&M) opinions of probable costs in order to calculate an annual financial assurance payment schedule that will
pay for closure and post -closure activities, Additionally, these landfill capital and O&M cost spreadsheets can
assist County landfill managers with a quick and reliable retrieval system for budgeting and operations
information.
Approach
Parametrix will update and complete the following:
0 Capital opinion of probable costs
4 O&M opinion of probable costs
0 Financial assurance technical memorandum
Deliverables
0 Electronic copies of the draft and final financial assurance documents
Grant County 555-3746-001
FY 2023 Ephrata Landfill 6 April 2023
Engineering and Environmental Services
EXH I BIT A —AMEN DIVI ENT TWENTY-SIX (continued)
Task 6 — Long -Term Disposal Options Study
Task Leader: Dwight Miller, PE
Background
The County has identified the need to develop anew solid waste disposal option by2032 to replace the existing
operating landfill (New Landfi/U.This option could consist of either a future landfill ora new transfer station with
the long haul ofwaste toanout+zf-countylandfill.
Paramctrixpreviously provided support to revise the Solid Waste Management Plan (SWMP) narrative and
recommendations to better define the scope of the Disposal Options Study and eliminate the need for aSWMp
amendment to implement the Disposal Options Study recommendations. Parametrix also provided the SWMp
cost assessment based on revised recommendations.
Pansmetrixinitiated the Long -Term Disposal OpbonsStudyeffortundertheFY2O22 amendment. This included
draft development ofoptions for siting and developing anew in -county landfill and contracting for long-haul and
disposal at an out -of -county landfill. The Long -Term Disposal Options Study will be further advanced under the
FY2O23Amendment,
Approach
Task 8.1— Disposal Options Study
Complete the Disposal Options Study toevaluate future disposal optionstoindudetwooptions:
• Siting and developing onew in -county landfill. This option would include:
> Siting and developing a new, limited -access, -mixed solid waste landfill. A limited -access landfill is one
that is closed to the general public and is accessed only by haul trucks from County transfer
stations/drop boxes, close -proximity collection route trucks, and other approved high-volume
haulers.
> Developing a transfer station/drop box system to support the new limited -access landfill.
w Contracting for long-haul and disposal ot anout-ofcountylandfill. This option would include:
> Siting and developing a new transfer station with capacity to accept all County waste for loading of
long-haul trailers. This option' would assume ahaul long enough 10necessitate the use ofa
compactor to provide denser loads for more efficient refuse hauling. The nearest regional landfill io
the Greater Wenatchee Landfill in East Wenatchee, which is 45 miles from Ephrata Landfill (presumed
location of transfer station). Hauling this distance would benefit from vvasba compaction.
> Conducting disposal procurement process toobtain competitive bids for long-haul trucking and
disposal. This option could also consider public or private operation of the transfer station.
The Disposal Option Study will provide critical input tothe long-term funding planning for the solid waste system,
including high-level cost and greenhouse gas considerations.
Schedule
Follows SWMP cost assessment and takes 3months, including County determination ofpreferred option. i
(Complete inJune.) '
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Grant County 555-3746-001�
p/z�a�h���n�n 7 2023
EXHIBIT A—AMENDMENT TWENTY-SIX (continued)
Task 6.2 — Capital Cost and Operation Costs Funding Plan
Develop a capital cost and operation costs funding plan (Funding Plan) for solid waste facility development and
operations based on the findings of the Disposal Options Study and current solid waste system obligations. This
Funding Plan will inform the rate study work to be conducted under Task 6.3. Elements of the Funding Plan will include:
• Old Ephrata Landfill Model Toxics Control Act (MTCA) Mitigation*
• Old Ephrata Landfill Post -Closure Care*
• New Ephrata Landfill Phase 4 Development
• New Ephrata Landfill Closure*
• New Ephrata Landfill Post Closure -Care*
• New Regional Landfill and Transfer System, or Long -Haul Infrastructure Siting and Development
• New Regional Landfill Phased Development and Closures (if chosen option)*
• Out -of -County Disposal Contracted Long -Haul and Disposal (if chosen option)
• Annual Operations (including equipment replacement)
*Closure and post-c.losure financial assurance obligations.
The Funding Plan will provide the financial basis for the rate study.
Schedule
Overlaps Task 6.1 by 1 month and takes 2 months. (Complete in July.)
Task 6.3 — Rate Study
Parametrix, in conjunction with subconsultant FCS Group, will develop a utility rate study to forecast annual
operating and capital financial obligations over a multiyear period and recommendations for tipping fee
adjustments to fully fund these obligations.
An initial kickoff meeting will be scheduled to introduce the project team, review the scope of work, identify
project objectives, outline the project schedule and key milestone review points, and discuss appropriate lines of
communication. Attendees will also review a list of data items needed to begin the solid waste cost -of -service
rate study.
Parametrix will develop a rate and financial toolkit. The rate and financial toolkit provides the analytical 1.
framework for the rate study. The toolkit is a fully integrated financial management model that establishes -a
cause -and -effect relationship between solid waste activities (e.g., tons, transactions, loads) and County revenues,
costs, and rates.
Parametrix will perform solid waste data validation and forecasting. Once the conceptual design of the toolkit is
finalized, we will review and validate solid waste operational data for use in the rate study. These data are the basis
for developing key components for the revenue requirement and cost -of -service analyses. Data validation makes
sure that tonnage, transaction, and load data are reconciled ,for accuracy and consistency within the rate study.
Parametrix will determine revenue requirements. A revenue requirement analysis determines the total amount of
money that the County must collect from tipping fees to pay for all operating and capital expenditures as well as
the financial requirements to comply with the County's fiscal policies. The revenue requirement is net of other
miscellaneous charges from grants and interfund transfers.
Grant County 555-3746-001
FY 2023 Ephrata Landfill 8 April 2023
Engineering and Environmental Services
EXHIBIT A — AMENDMENT TWENTY-SIX (continued)
Parametrix will perform a cost -of -service analysis. The cost -of -service analysis provides a defensible basis for
allocating the revenue requirement to each customer class of service based on their unique service characteristics
and requirements. In some cases, County expenses can be directly assigned to a particular customer class. In
other cases, costs may not directly relate to a single customer class and, as a result, are treated as a shared cost.
Landfill disposal costs would likely be allocated proportionally to all customer classes that deliver solid waste to
County facilities.
Parametrix will develop a rate design for changes to the system of charges for customers of the solid waste
system. At a basic level, the rate design process establishes cost -based, equitable rates for each customer class,
which generate the overall revenue needs to fully support the operations.
Parametrix will prepare and submit a draft report to County staff for review and comment. The report will
document the assumptions, methodologies, findings, results, and recommendations of the solid waste rate study.
Detailed technical analyses supporting the study will be included as appendices (e.g., financial schedules of
forecasted revenues, fixed and variable expenditures, financial policy achievement, and rates). A final report will
be prepared based on feedback on the draft report by County staff.
The task includes up to five virtual meetings with the County as well as two on-site meetings with the Solid Waste
Advisory Committee and/or Board of County Commissioners. Presentation materials will be provided to the
County for review prior to the virtual and on-site meetings.
Schedule
Task 6.3 overlaps Task 6.2 by 1 month and may take approximately 4 months depending on the County review
process. (Complete in May.) With a 90 -day notification period required for rate increases, an initial increase
would occur sometime after October 2023.
Deliverables
Parametrix will prepare and submit the following:
Draft and final Disposal Options Study -technical memorandum for the alternatives analysis to inform the
County during their decision-making process
Draft and final Capital Cost and Operation Costs Funding Plan
0 Draft, and final a rate study
Task 7 — Pavement Design for Entrance Improvements
Background
The New Landfill entrance in the vicinity of the scale facility has been experiencing roadway deterioration. The
County plans to complete this work with their own crews but would like a pavement section design
recommendation.
Approach
Parametrix will evaluate current conditions and provide recommendations for subgrade improvement, and
base/top course and pavement type and thickness. The results of the evaluation will be a brief technical
memorandum with a pavement section figu"re. Materials will be identified per the Washington State Department
of Transportation 2023 Standard Specifications for Road, Bridge, and Municipal Construction. The resulting
Grant County 555-3746-001
FY 2023 Ephrata Landfill 9 April 2023
Engineering and Environmental Services
EXHIBIT A —AMENDMENT TWENTY-SIX (continued)
technical memorandum will be for the County's consideration in self -performing the repaving of the entrance
road and will not be appropriate for bidding or other third -party use.
Deliverables
Parametrix will prepare and submit to the County:
0 Draft and final electronic copies of the technical memorandum
Task. 8 — Phase 4 Development Design
Task Leader: Tiffany Neier, PE
Background
Parametrix will provide engineering services to develop the final design PS&E and the Construction Quality
Assurance (CQA) Plan for construction of Phase 4 Development of the New Landfill based on the design presented
in the approved Ephroto New Londfill Permit Applicotion Phases 1 through 4 (Parametrix 2020).
Approach
Task 8.1 — 90% PS&E
Based on the design presented in the Ephroto New Londfill Permit Applicotion Phases 1 through 4
(Parametrix 2020) and subsequent (Ecology conditions of approval, Parametrix will provide 90% -level PS&E
contract documents. We will prepare 90% PS&E in finished detail sufficient for County staff and agency review.
The specifications will contain the current CQA Plan as an appendix. The specifications will be developed in
Washington State Department of Transportation 2023 Standard Specifications for Road, Bridge, and Municipal
Construction format. The County will provide Parametrix with new topographic survey information, which shows
the initial excavation of the landfill expansion area and any other deviations from the base map, as indicated on
the permit application plans. The survey information shall preferably be in AutoCAD 2022 format.
Plans and specifications covering the following plan sheets will be prepared:
• Title Sheet Vicinity Map, and Index to Drawings
• Abbreviation and Legend
• Detailed Overall Site Plan
• Phase 4 Development West Grading Plan
• Phase 4 Development East Grading Plan
• Grading, Access Road, and Surface Water Sections and Details
• Liner System and Leachate Collection System Sections and Details
• Landfill Gas Plan
Landfill Gas Sections and Details
9 Miscellaneous Details
A meeting will be scheduled after the 90% completion for review with County and agency staff. Parametrix will
attend one review meeting with County and agency staff, which will be schedule for 1 day.
Grant County 555-3746-001
FY 2023 Ephrata Landfill 10
April 2023
Engineering and Environmental Services
EXHIBITA— AMENDMENT TWENTY-SIX (continued)
Task 8.1 — Final Construction Contract Documents
Parametrix will provide 100% -level design based on the 90% -level design and County and agency staff review
comments. we will prepare PS&E and final bidding schedule. Parametrix will provide one reproducible copy and
one disk copy of biddable plans and specifications for bidding by the County.
Task 8.1 — Bidding Assistance
Parametrix will assist the County in soliciting and evaluating bids for the construction of Phase 4 Development.
This work will consist of engineering support during the bidding process that we anticipate will occur over a
30 -day period. This work will include the following assistance to the County:
• Address inquiries from prospective bidders and suppliers to provide clarification of design and elements
of CCA.
• Prepare up to two addenda as necessary for contract amendment.
• Assist the County and attend a prebid meeting including a visit to the landfill site to familiarize
prospective bidders with the site, discuss the major elements of the work, answer questions, and address
concerns.
• Assist the County in preparing a prebid meeting summary to be issued to all plan holders in the form of an
addendum.
• Prepare supplemental and revised contract drawings and specifications as needed for addenda.
•, Review bids and prepare an engineer's statement of bid tabulation stating the apparent low bidder and
recommendation for award.
Deliverables
Parametrix will prepare and submit to the County:
• Electronic copies of the 90% -level PS&E
• Ohe electronic,copy of the final bid documents (100% -level design)
Note, the CQA Plan will be incorporated into both the 90% -level and final specifications as an appendix.
Parametrix will provide the following bidding process deliverables:
• Addenda (two, as required)
• Bid tabulation statement '
Grant County 555-3746-001
FY 2023 Ephrata Landfill 11 April 2023
Engineering and Environmental Services
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