TaskOrder_PWS_Chumbley-Cottonwood_Maint_Final April 29.pdf
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- Solicitation number
- W9127N26QA064
About this file
This is a Task Order Performance Work Statement for maintenance services at two wildlife mitigation sites in Cowlitz County, Washington.
The US Army Corps of Engineers – Portland District is soliciting maintenance services for riparian plantings at the Chumbley and Cottonwood Island wildlife mitigation sites during the period of June 1, 2026 through December 31, 2026. The contractor must perform twelve tasks across both sites, including mobilization/demobilization, manual removal of invasive vegetation (yellow flag iris, poison hemlock, Himalayan blackberry, and tansy ragwort), mowing and weed whacking, herbicide application, re-seeding, and vegetation/wildlife assessments. At Chumbley Site, tasks involve approximately 10 acres of manual removal, 30 acres of mowing/weed whacking, and 20 acres of herbicide application; re-seeding is not required for 2026. At Cottonwood Island Site, approximately 45 acres require manual removal, 70 acres require mowing/weed whacking, 45 acres require herbicide application, and 15 acres require re-seeding. Work at Cottonwood Island is restricted to the environmental window of June 15 through October 31 to protect a heron rookery. Deliverables include manual removal completion by July 1, mowing by July 15, herbicide application by early September, re-seeding by October 31, and draft assessment reports by November 30 with final reports due December 31, 2026. Invoices must be submitted to the USACE Finance Center in accordance with FAR clause 52.212-4(g), with copies to the designated government representatives. Points of contact include Contracting Officer Mieko Alley, COR Clayton Olinger, and Contract Specialist Lara Krauss.
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Task Order Performance Work Statement for the
Maintenance of Chumbley and Cottonwood Island Wildlife Mitigation Sites Projects in 2026
Cowlitz County, Washington
1. General Statement
The US Army Corps of Engineers – Portland District (Corps) is soliciting for services to maintain existing riparian plantings at the Chumbley and Cottonwood wildlife mitigation sites in Cowlitz County, WA (Attachments 1 and 5). This is a non-personal services requirement. The contractor shall perform these services in accordance with the terms of the contract and as defined in Single Award Task Order Contract (SATOC) #TBD and this Performance Work Statement (PWS).
The task order period of performance is 1 June 2026 through 31 December 2026.
For 2026, the Corps has identified the acreage requirements for the Chumbley and Cottonwood Island sites as described in the 2026 requirements below (tasks 1 through 12). Pricing shall be in accordance with the SATOC terms and price schedule.
The approved environmental work window for Cottonwood Island is from 15 June to 31 October. The Contractor is not allowed to begin work before 15 June for the protection of a heron rookery.
2. Definitions
Terms are defined throughout this PWS as follows:
Contracting Officer’s Representative (COR): The Government employee who has been authorized in writing as the Contracting Officer’s Representative, acting within the limits of their authority.
3. Task 1 – Mobilization and Demobilization to Chumbley Site
One mobilization and demobilization required.
4. Task 2 – Manual removal of invasive vegetation at Chumbley Site
This task includes approximately 10 acres of manual removal of yellow flag iris, poison hemlock and Himalayan blackberry.
5. Task 3 – Mowing and Weed Whacking at Chumbley Site
This task includes approximately 30 acres of mowing and weed whacking invasive species listed in Attachment 11(except plants actively in flower).
6. Task 4 – Herbicide Application at Chumbley Site
This task includes approximately 20 acres of herbicide application of species listed in Attachment 11.
7. Task 5 – Re-seeding at Chumbley Site
This task is not required for 2026.
8. Task 6 – Riparian Mitigation Site Vegetation and Wildlife Assessments at Chumbley Site
One assessment is required for 2026.
9. Task 7 – Mobilization and Demobilization to Cottonwood Island Site
One mobilization and demobilization required.
10. Task 8 – Manual removal of invasive vegetation at Cottonwood Island Site
This task includes approximately 45 acres of manual removal of yellow flag iris, tansy ragwort and Himalayan blackberry.
11. Task 9 – Mowing and Weed Whacking at Cottonwood Island Site
This task includes approximately 70 acres of mowing and weed whacking invasive species listed in Attachment 11(except plants actively in flower).
12. Task 10 – Herbicide Application at Cottonwood Island Site
This task includes approximately 45 acres of herbicide application on species listed in Attachment 11.
13. Task 11 – Re-seeding at Cottonwood Island Site
This task includes approximately 15 acres of re-seeding at Cottonwood Site.
14. Task 12 – Riparian and Wetland Mitigation Site Vegetation and Wildlife Assessments at Cottonwood Island Site
One assessment is required for 2026.
15. Points of Contact
Contracting Officer: Mieko Alley 510-648-1971 mieko.g.alley@usace.army.mil
COR: Clayton Olinger 503-451-9146 Clayton.R.Olinger@usace.army.mil
Contract Specialist: Lara Krauss 503-808-4613 Lara.A.Krauss@usace.army.mil
Invoices: Clayton Olinger 503-451-9146 Clayton.R.Olinger@usace.army.mil and James McMillan 503.915.7521 james.m.mcmillan@usace.army.mil.
16. Invoice Submittal & Contract Administration
Invoices shall be prepared in accordance with FAR clause 52.212-4(g). Invoices shall be submitted to the following:
Submit an Electronic PDF Invoice to Millington (the USACE Finance Center) via email address: CEFC-G2INVOICES@USACE.ARMY.MIL
One Electronic Copy to the following:
clayton.r.olinger@usace.army.mil and james.m.mcmillan@usace.army.mil
17. Attachments
a. Attachment 24 – 2026 Deliverables Schedule
ATTACHMENT 24 – 2026 Deliverables Schedule
PWS
Section
Deliverable
Delivery Date
4, 5, 32 Pre-work Deliverables Prior to initiation of the work tasks or as otherwise stated in PWS.
3 Task 1: 2026 Mobilization and Demobilization to Chumbley Site
No later than 2 weeks after task order award.
4 Task 2: Manual removal of invasive vegetation at Chumbley Site
No later than July 1, 2026.
5 Task 3: Mowing and Weed Whacking at Chumbley Site
No later than July 15, 2026, excluding reed canary grass.
6 Task 4: Herbicide Application at Chumbley Site
Complete all herbicides application by early September 2026.
7 Task 6: Riparian Mitigation Site Vegetation and Wildlife Assessments at Chumbley Site
Draft report due by 30 November 2026. Final report due by 31 December 2026.
8 Task 7: 2026 Mobilization and Demobilization to Cottonwood Island Site
No later than two weeks after 15 June 2026.
9 Task 8: Manual removal of invasive vegetation at Cottonwood Island Site
No later than July 1, 2026. Note: cannot begin work prior to 15 June 2026.
10 Task 9: Mowing and Weed Whacking at Cottonwood Island Site
No later than July 15, 2026. Note: cannot begin work prior to 15 June 2026.
11 Task 10: Herbicide Application at Cottonwood Island Site
Complete all herbicides application by early September 2026.
12 Task 11: Re-seeding at Cottonwood Island Site
Re-seeding performed following herbicide application in fall 2026 but no later than October 31, 2026 and consultation with COR.
13 Task 12: Riparian and Wetland Mitigation Site Vegetation and Wildlife Assessments at Cottonwood Island Site
Draft report due by 30 November 2026. Final report due by 31 December 2026.
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