B08-COLO_2026_Invasive_Species_Removal___Treatment_SOW.docx

Remove Invasive Species & Herbicidal Treatment to Maintain Interpreted Viewsheds and Protect Cultural Resources Yorktown PMIS 339716, Component B PMIS 226370, Component F

SUMMARY OF WORK

Remove Invasive Species Yorktown Sites- 2024

DESCRIPTION

The work of this contract consists of :

Item One (1) Clearing and treating 2.54 acres of live and dead mature invasive species at the Colonial Parkway & Route 238 site, adjacent to the American Revolution Museum.

Item Two (2) Herbicidal treatment only of 8.76 acres previously infested with live and dead mature invasive species in four (4) locations within Colonial National Historical Park, within the Village of Yorktown in Yorktown, Virginia.

Work for Item One (1) regarding the 2.54 acre site includes removing dense to sparse stands of Golden Bamboo (Phyllostachys aurea), small to medium live invasive Empress Trees (Paulownia tomentosa) trees, stands Chinese privet (Ligustrum sinense) shrubs, dead trees and branches, live Chinese Wisteria (Wisteria Chinensis) and English Ivy (Hedera helix) vines to the ground. Work shall be completed in two phases. Mechanical removal of the targeted vegetation will be done in one phase. The second phase includes applying a foliar herbicide treatment once the bamboo has resprouted and grown 3-4’ tall (when the bamboo resprouts leaves). Spray treatment currently includes remaining live wisteria, privet, English ivy and Paulownia sprouts within the removal area. Slopes vary from level to 35% ravines.

Work for Item Two (2) regarding the 8.76 acres across four individual sites includes foliar herbicidal treatment only of a specified concentration of glyphosate, mixed with non-ionic surfactant and blue dye with ground sprayer equipment. Apply thoroughly on leaves just to the point of drip. The blue dye should cover the leaves and be detected visually after dried. Aerial spraying will not be approved. Target species are Golden Bamboo (Phyllostachys aurea), invasive Empress Trees (Paulownia tomentosa), Chinese privet (Ligustrum sinense), Chinese Wisteria (Wisteria Chinensis) and English Ivy (Hedera helix. The application of foliar herbicide treatment should take place once the bamboo has resprouted and grown 3-4’ tall (when the bamboo resprouts leaves). Slopes vary from level to 35% ravines.

PERIOD OF WORK:

The Contractor shall start no later than September 20, 2026, and complete removal of invasive plants and treatment for the 2.54 acre site and herbicidal treatment only of the 8.76 acres across four sites (both Items 1 and 2) no later than November 24, 2026.

Item One (1) (2.54 acre site) shall occur in two phases. After Phase One (clearing and removal) is complete, Phase Two of the work will continue once the vegetation has resprouted into full leaf or (3-4 feet) to apply foliar treatment. A repeat herbicide treatment to capture plants that did not die in the first round will be spot treated as needed. This shall be completed no later than November 24, 2027.

Item Two (2) Herbicidal treatment should occur in the late summer once the vegetation has resprouted into full leaf or (3-4 feet) to apply foliar treatment and begin not later than September 20, 2026. Work shall be completed no later than November 24, 2026.

A. LOCATIONS

ITEM ONE (1) (2.54 acre site adjacent to Rev War Museum)

Colonial Parkway & Route 238:

Primarily 99% bamboo with small to large native trees interspersed, this 6.1-acre site is located on a large flat to gentle terrace that meets a 30-35% slope leading to a marsh. There is a section across the marsh where individual bamboo plants have started. The bamboo in this area is of medium to light density. Work to remove and treat invasives shall only be performed within the NPS owned 2.54 acre portion.

Route 238 is a VDOT road and the contractor will need to coordinate with the state to put up traffic control signs during the work period. The site can be accessed along Route 238. No access is available by vehicle along the Colonial Parkway.

Due to the low to medium density and maturity of the bamboo, removal can be done both by hand and by large forestry mulching machines, if the existing native trees are not mulched or damaged. The few (<20) bamboo on the other side of the ravine and marsh must be accessed by foot and cut by saw or hand, cut the stem as close to the ground as possible to avoid tripping.

ITEM TWO (2) (8.76 acres across four individual sites)

Tobacco Road:

The 5.1-acre Tobacco Road site is located along the west of Zweybrucken Rd, in-between the NPS Yorktown Battlefield Visitor Center and Victory Monument in Yorktown, Virginia. The site can be accessed from the base of the grassy top and from the bottom of the trail with access from the Picnic Area. The use of the gravel Tobacco Road is also available. Most of the site is flat however a portion contains steep slopes up to >35%.

Moore House:

The 1.3-acre Moore House site is located just north of the intersection of Moore House Rd and Ballard St in Yorktown, VA, to the west of the historic Moore House structure.

Cornwallis Cave:

The 1.85-acre Cornwallis Cave site is located near the intersection of Comte De Grasse St and Water St in-between Water St and the historic Dudley Digges house in Yorktown, VA. This area has uneven terrain and slopes up to >35%.

Windmill Point:

The 0.51-acre Windmill Point site is located to the southwest of the intersection of Mathews St. and Water St. in Yorktown, VA. Main access should be at the flat area along Mathews St. (VDOT road connecting Water Street with Route 17).

CONTRACTOR'S USE OF PREMISES

Safety: The contractor shall always conduct operations to ensure the least inconvenience to the public. Provide a Safety sign and trail closure plan for Park review before starting work. They should at a minimum include the following.

Provide MUTCD-rated safety cones and Road Traffic signs and approval by VDOT for Windmill Point site.

Confine storage of materials and equipment to the open flat areas as per NPS park direction.

Any equipment left should only be left locked in some vandal-proof container out of sight from most of the visitor areas.

Preservation of Natural Features: Confine all operations to the work limits of the project. Prevent damage to natural surroundings. Restore damaged areas, repairing or replacing damaged trees and plants, at no additional expense to the Government.

Provide temporary barriers to protect existing trees and plants and root zones as feasible.

Do not remove, injure, or destroy trees or other plants without prior approval.

Do not fasten ropes, cables, or guys to existing trees.

Carefully supervise vegetation treatment close to live trees to avoid damage from overspray.

Archeological sites: The Park will flag the edges of remnant earthworks found on sections of the top of the slopes. No heavy equipment is allowed to drive over the area. See further details on the inadvertent discovery of surface artifacts in Section 01350, Archeological Protection.

Hauling Restrictions: Comply with all legal load restrictions for the hauling of materials. Load restrictions on park roads are identical to the state load restrictions with such additional regulations as may be imposed by the Park Superintendent.

SPECIAL WORK REQUIREMENTS

Holiday Work Restrictions: No on-site work shall be performed on any Federal Holidays and a five-day workweek unless otherwise directed by the COR. This includes Yorktown Day, October 19 and any day the park is hosting or facilitating a special event.

FIELD VERIFICATION

A pre-bid field visit is RECOMMENDED. The sites need to be seen to ensure that the bidder understands the complexity of the level of effort.

Field verify all new and existing dimensions affecting the work of this contract before ordering products.

MATERIALS

All materials shall be Contractor‑furnished from outside the park.

See SECTION 022300 Cutting and Spraying See SECTION 01560 Barriers and Signage PART 3 EXECUTION Not used.

PART 3 EXECUTION

1. See SECTION 022300: Cutting and Spraying

PART 4 MEASUREMENT AND PAYMENT

END OF SECTION

SECTION 01350

ARCHEOLOGICAL PROTECTION

1.

PART 1 GENERAL

Remove Invasive Species Yorktown Sites 01350

PART 1 GENERAL

1.1 DESCRIPTION

The work of this section consists of protecting archeological resources contained in soil deposits.

PART 2-SUBMITTALS

As specified in Section 01330

PART 1 GENERAL

QUALITY ASSURANCE

At least one week before on-site work begins, Contractor shall meet with Contracting Officer and Staff Archeologist to discuss Daily Work Schedule and equipment and special methods to be used in archeologically sensitive areas. The contractor shall ensure that the approved Daily Work Schedule is followed throughout construction.

PART 2 PRODUCTS

PART 3 EXECUTION

SECTION 01560

BARRIERS & SIGNAGE

Remove Invasive Species Yorktown Sites

02230

DESCRIPTION

The work of this section consists of furnishing, installing, and maintaining barriers and signage to protect existing facilities and the public from construction operations.

GENERAL

Material may be new or used but shall be suitable for the intended purpose. Fencing and Barriers shall be structurally adequate and neat in appearance.

BARRICADES AND SIGNS

Manual on Uniform Traffic Control Devices (MUTCD), Part VI, 1988 edition Herbicide Treatment signs or flags to indicate the area was sprayed, as per Virginia Pesticide notification requirements.

BARRIER TAPE

Barrier tape imprinted with "CAUTION: CONSTRUCTION AREA".

PROTECTION OF PUBLIC

Barricade or otherwise block off only those areas of immediate work area to prevent unauthorized entry.

Erect and maintain barricades, lights, danger signals, and warning signs in accordance with MUTCD-1988.

When pedestrian traffic is detoured onto a roadway, provide temporary walkways with protection as required at ends and overhead.

Enclose the entire project site or, if approved by the Contracting Officer, the area of work.

BARRIER TAPE

Installation where directed by Contracting Officer. Keep a minimum of two rolls on site at all times.

REMOVAL

Completely remove barriers no longer needed when approved by the Contracting Officer.

PART 4 MEASUREMENT AND PAYMENT

END OF SECTION

SECTION 022300

INVASIVE PLANT AND TREE REMOVAL

PART 1 - GENERAL

DESCRIPTION

A. Work includes the herbicide treatment of the cut area after resprouting as described in the summary of work.

1.2 RELATED REQUIREMENTS

Archeological protection – Section 013500.

Certified Pesticide Applicator License from Virginia. Provide certifications to the Park COR for each individual applicator on the job site

PART 2 - PRODUCTS

II.

HERBICIDE

A. Herbicide: The product must include 53.8% Glyphosate IPA in its concentrated form. This will be effective for the list of plants targeted. Please submit the product label for Park COR approval.

SPRAY INDICATOR COLORANT

Bullseye Blue or approved equal. Please submit the product label for Park COR approval.

NON-IONIC ACTIVATOR SURFACTANT

A. Must be mixed to a concentration of 0.5% with the Herbicide before spraying. Please submit the product label for Park COR approval.

PART 3 - EXECUTION

3 .1 PROTECTION OF TREES AND PLANTS TO REMAIN

A. Tree Protection Zone: Area surrounding individual trees or groups of trees to be protected during treatment and defined by the drip line of individual trees.

3 .2 REMOVING PLANT MATERIAL

A. Remove all dead standing trees, dead branches and trunks on the ground, brush, and vegetation from areas designated to be cleared. As directed, trim low hanging, unsound, or unsightly branches on trees and shrubs designated to remain. Make cuts flush with trunk or branch. This can be done by machinery or hand as required.

B. Protect live trees during removal of material.

Remove existing bamboo, privet, and wisteria and English ivy by hand as required by the situation: cut all sizes of stalks as close to the ground as possible.

3 .3 HERBICIDE TREATMENT

A. Once bamboo and the other targeted invasive plants have leafed out, foliar treat with a 5% solution of specified concentration of glyphosate, mixed with non-ionic surfactant and blue dye with ground sprayer equipment. Apply thoroughly on leaves just to the point of drip. The blue dye should cover the leaves and be detected visually after dried. Aerial spraying will not be approved.

B. Wait 14 days and reapply the glyphosate re apply at a 2-3% solution and admixtures. After the second treatment, leave the bamboo alone. Do not cut, mow, or remove plant material.

3 .3 GRUBBING

A. Remove any upturned stumps by cutting any in-ground roots off at the soil surface. Remove all loose branches, and downed tree debris from the site.

3 .4 DISPOSAL

A. Recycle all acceptable wooden and bamboo debris that could not be mulched by a forestry mulcher.

END OF SECTION 022300

CONTRACT BID SCHEDULE

NATIONAL PARK SERVICE INTERNAL USE ONLY

PROJECT: Herbicidal Removal & Treatment to Eradicate Invasive Species

PARK: COLONIAL NATIONAL HISTORICAL PARK

ITEM ONE (1):

Remove and Treat 2.54 ac 1 @ L.S. = $______________

ITEM TWO (2):

Tobacco Road, Moore House, Cornwallis Cave, and Windmill Point 1 @ L.S. = $______________ Herbicidal Treatment Only