Duncan Park Hemlock Wooly Adelgid Survey & Treatment - Addendum
| Location: | Michigan |
|---|---|
| Posted: | Apr 1, 2026 |
| Due: | Apr 8, 2026 |
| Agency: | City of Grand Haven |
| Type of Government: | State & Local |
| Category: |
|
| Publication URL: | To access bid details, please log in. |
March 20, 2026
Duncan Park Hemlock Wooly Adelgid Survey & Treatment
Bids need to be received by 10:00 a.m. on Wednesday, April 8, 2026.
Attachment Preview
CITY OF GRAND HAVEN
GRAND HAVEN, MICHIGAN
Duncan Park Commission
March 20, 2026
NOTICE TO BIDDERS
REQUEST FOR PROPOSALS
It is the intent of the Duncan Park Commission in the City of Grand Haven to receive bids for a Hemlock
Wooly Adelgid survey and treatment plan as indicated in the request for proposal titled “Duncan Park
Hemlock Wooly Adelgid Survey and Treatment".
Sealed proposals must be received by the City of Grand Haven, 519 Washington Avenue, Grand Haven,
Michigan, 49417, ATTN: Ms. Maria Boersma, City Clerk, before 10:00 a.m. local time, Wednesday,
April 8, 2026, at which time the proposals will be publicly opened and read aloud. Proposals must be
submitted on the official proposal form attached. Sealed proposal envelopes must be clearly marked on the
outside “Duncan Park Hemlock Wooly Adelgid Survey and Treatment".
Copies of the Requests for Proposals (RFP) that contain the minimum specifications and official proposal
forms are available at the City Clerk’s office at City Hall, 519 Washington Avenue, Grand Haven,
Michigan 49417 or online from the City’s Web site: www.grandhaven.org.
Any questions regarding this RFP or the minimum specifications can be directed via email to the Duncan
Park Commissioner- duncanpark@grandhaven.org or Georgette Sass at 616 405 3691.
The City of Grand Haven reserves the right to reject any or all bids or any parts of the same, to waive any
irregularities and to accept any bid in its own best interest.
Georgette Sass
Duncan Park Commission, President
Michael England
Duncan Park, City Liaison
Department of Public Works
City of Grand Haven,
Michigan 49417
Page 1 of 1
Duncan Park Hemlock Survey and Treatment
Duncan Park – City of Grand Haven
PROJECT OVERVIEW
The Duncan Park Commission is seeking qualified contractors to provide professional
arboricultural/forestry services for the survey, assessment, and treatment of Eastern
Hemlock (Tsuga canadensis) trees located at:
Duncan Park
1300 Sheldon Road
Grand Haven, Michigan 49417
Coordinates: 43.0535745869, -86.2309228129
The project includes updating the 2019 hemlock inventory, assessing current pest
pressures, administering appropriate treatments for Hemlock Woolly Adelgid (HWA) and
providing a comprehensive report with the optional inclusion of management
recommendations. 2019 survey data will be provided to the selected contractor.
SCOPE OF SERVICES
The successful bidder shall provide all labor, materials, equipment, supervision, and
reporting necessary to complete the following services:
1) Site Survey and Inventory Update
Update the 2019 hemlock inventory and conduct a current field assessment. Deliverables
shall include:
A. Tree Inventory Verification
● Confirm and update tree locations
● Update or replace tree tags as necessary
● Record Diameter at Breast Height (DBH)
● Note any new, missing, or removed trees
B. Pest Assessment
● Classify infestation severity using a consistent and clearly defined rating system (see
Attachment #2, for an example)
● Document presence of Elongate Hemlock Scale (EHS; Fiorinia externa)
C. Tree Health Evaluation
● Document overall tree health and canopy condition (see Attachment #2, for an example)
● Identify stress factors that may impact treatment efficacy
● Note excessive pest pressure or declining tree health
● Identify trees recommended for removal, if applicable
2) Hemlock Treatment Services
Treatment shall be performed in accordance with all current federal and state pesticide
regulations and label requirements.
A. Standard Treatment
● Administer trunk injections of imidacloprid for all trees with low to moderate HWA
infestation and sufficient health to respond to systemic treatment.
B. Elevated Infestation Treatment
● Trees exhibiting excessive HWA infestation would be treated with dinotefuran, if
appropriate.
● Trees treated with dinotefuran must be clearly marked and documented to ensure proper
follow-up with imidacloprid in future treatment cycles.
C. Treatment of Small Diameter Trees
● Trees below approximately 5 inches DBH require an alternative treatment method when
appropriate, which may include - Soil drench, Soil injection or Basal bark treatment (where
label permits)
D. Application Requirements
● All product selection and application rates must comply with current label instructions.
● Contractor shall follow industry best practices for trunk injection to minimize tree injury.
● Contractor shall ensure environmental protection measures are implemented during
application.
3) Reporting and Deliverables
The contractor shall provide a comprehensive written report and GIS-compatible mapping
files summarizing survey findings and treatment actions. The selected contractor shall
present survey findings and treatment recommendations to the Duncan Park Commission
in a clear and concise format, including treatment rationale and anticipated outcomes. At
minimum, the report shall include:
1. Total number of hemlock trees (with DBH data) aligned with the 2019 survey
2. Summary of HWA infestation severity across the site
3. Documentation of EHS presence, if applicable
4. Number of trees:
o Treated with imidacloprid or dinotefuran
o Recommended for removal
5. GIS-compatible map(s) showing:
o Tree locations
o Treatment types
o Infestation levels
6. Recommendations for:
o Monitoring intervals
o Retreatment schedules
4) QUALIFICATIONS
The City may require bidders to demonstrate:
● Valid Michigan pesticide applicator licensing
● ISA Certified Arborist credentials (or equivalent)
● Experience with HWA treatment and management
● Experience with municipal or public park projects
● Proof of insurance and bonding required with bid
Attachment #1
Attachment #2
HWA Infestation Severity Rating
Rating
0 – None
1 – Low
2 – Moderate
3 – High
4 – Severe
Description
No visible HWA present
Isolated ovisacs present on <10% of branch tips
Ovisacs present on 10–40% of branch tips
Ovisacs present on 40–75% of branch tips; visible throughout canopy
>75% of branch tips infested; heavy populations with visible canopy thinning
Tree Health Classification
Class
Good
Fair
Poor
Critical
Description
Full canopy, minimal dieback (<10%), vigorous growth
Some thinning or dieback (10–30%) but recoverable
Significant canopy decline (30–50%)
Severe decline (>50% canopy loss)
This is the opportunity summary page. It provides an overview of this opportunity and a preview of the attached documentation.
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