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Home My WebLink AboutRiverwalk Park Inspection Report 2025-06-17 MEMORANDUM BETA GROUP, INC. www.BETA-Inc.com BACKGROUND On June 17, 2025, BETA staff visited the Yarmouth Riverwalk Park Site located at 669 Route 28 in Yarmouth, MA to perform environmental monitoring during the Phase 1 construction period. The purpose of this inspection was to document conditions of the salt marsh, erosion controls and park during Phase 1 of construction. The following was observed during the inspection: BOARDWALK/SALT MARSH Areas of the salt marsh where wetland matting was placed adjacent to the constructed boardwalk were observed to have more vegetative growth than during the last inspection (Photos 2 and 4); however, some areas still show relatively sparse vegetative cover (Photos 1 and 3). The western side of the boardwalk was observed as having less vegetative cover than the eastern side of the boardwalk. Vegetation including sea purslane (Sesuvium portulacastrum), Virginia glasswort (Salicornia deprassa), hightide bush (Iva frutescens), triangle orache (Atriplex prostrata), and grass species were observed as vegetating areas previously noted to be lightly vegetated. Crabs appear to be utilizing areas with limited vegetative cover to burrow. The salt marsh conditions will continue to be monitored. EROSION CONTROLS Two (2) layers of erosion controls consisting of silt fence and compost filter tubes are present along a majority of the limit of work. Erosion controls were observed in varying stages of biodegradation. Erosion controls adjacent to the salt marsh on the western side of the boardwalk were observed to be in good condition. Erosion controls on the eastern side of the boardwalk were observed to require repair/replacement (Photo 5 and 6). During the inspection the contractor indicated these would be repaired/replaced this week. Erosion controls adjacent to the Parker River, near both the kayak launch boardwalk (Photo 7) and the upweller (Photo 8), which were previously observed as degraded, have been replaced and are in good working order. No further rill erosion or sediment outwash was observed at the Site. Multiple areas of exposed soil are present at the Site (Photo 9), including upgradient of the salt marsh (Photo 5). Erosion controls are in good condition upgradient of Resource Areas with the exception of the erosion controls adjacent to the eastern side of the boardwalk. To ensure no sediment enters Resource Areas, erosion controls should be maintained. Date: June 18, 2025 Job No.: 22.10056.00 To: Amanda Lima, PE Town Engineer Kathy Williams, PE, Town Planner Brittany DiRienzo, Conservation Administrator From: Arek Galle, RLA, AICP, Senior Associate, BETA Group Prepared: Anna Haznar, Staff Scientist Subject: Yarmouth Riverwalk Park and Boardwalk Phase 1 Yarmouth, MA Site Monitoring June 18, 2025 Page 2 of 2 RIVERWALK PARK Currently, Phase 1 of the Riverwalk Park is under construction. Once construction is complete, in locations of exposed soil, stabilization should commence. Hydroseed was observed to have been recently placed over many areas of exposed soil throughout the Site (Photo 10). Soil stockpiles were observed to be not encompassed by supplemental erosion controls, noted to be near the Kayak launch and future restroom area. throughout Site (Photo 9). Stabilization of stockpiles should commence if active work is not occurring, or within 14 days of the cessation of work in the area. During this inspection, no significant invasive plant species pressure was observed internal of erosion controls; however, the site should continue to be monitored for success of the invasive species removal plan. Species including bush honeysuckle (Lonicera spp.), autumn olive (Elaeagnus umbellate), and bittersweet (Celastrus orbiculatus) were observed in small populations outside of the limits of work directly adjacent to erosion controls (Photo 11 and 12). Japanese knotweed (Fallopia japonica) was observed as sprouting within a planted area where a large population was removed (Photo 13). Additionally, a population of bittersweet was observed (Photo 14) within the boulders adjacent to the walking path. The population of cypress spurge (Euphorbia cyparissias) that was observed during the last inspection appears to have gone to seed and is dying back. SUMMARY Currently, Phase 1 of the Yarmouth Riverwalk Park and Boardwalk Project is under construction but the earthwork is nearing completion with the majority of work now occurring on the perimeter walks and edge areas. . Observations made during the June 17, 2025, inspection include the following:  Areas of sparse vegetation adjacent to the boardwalk show signs of recovery and appear to be partially vegetated. These areas will continue to be monitored this season for re-establishment of the salt marsh  Erosion/sediment controls throughout the site are in varying conditions,  Degraded erosion/sediment controls require repair/maintenance in areas to remain effective.  Areas of exposed soil are present throughout the site but generally were found to have erosion controls downgradient,  Areas of exposed soil are present at east and west boardwalk approach and need to be stabilized, thru either temporary or permanent seeding, Soil stockpiles should be temporarily stabilized if not in use for 14 days or more,  Erosion/sediment controls installed at stockpiles not in use,  Minor invasive plant species pressure was observed outside of the work area directly adjacent to erosion controls and within a naturalized area near the kayak launch. Attachments: - Photographic Documentation - Site Aerial Image PHOTOGRAPHIC DOCUMENTATION Yarmouth Riverwalk Yarmouth, Massachusetts Photographs Documented June 17, 2025 Photo 2 View of an areas of marsh vegetative re-growth on the south-eastern side of the boardwalk. (Facing north-east) View an area of exposed marsh sand with slow vegetative recovery on the western side of the boardwalk (Facing south) Photo 1 PHOTOGRAPHIC DOCUMENTATION Yarmouth Riverwalk Yarmouth, Massachusetts Photographs Documented June 17, 2025 Photo 4 View of an area on the eastern side of the boardwalk showing more uniform vegetative regrowth. (Facing north) View of an areas of marsh vegetative regrowth includes some areas of sparse vegetative recovery. View located on the southern side of the boardwalk—facing south-west. Photo 3 PHOTOGRAPHIC DOCUMENTATION Yarmouth Riverwalk Yarmouth, Massachusetts Photographs Documented June 17, 2025 Photo 6 Another view of erosion controls on the western side of the boardwalk that require repair. View of erosion controls on the western side of the boardwalk that require repair—facing west. Photo 5 PHOTOGRAPHIC DOCUMENTATION Yarmouth Riverwalk Yarmouth, Massachusetts Photographs Documented June 17, 2025 Photo 8 View of erosion controls near the upwell in good condition —facing east. View of erosion controls near the kayak launch in good condition—facing south-east. Photo 7 PHOTOGRAPHIC DOCUMENTATION Yarmouth Riverwalk Yarmouth, Massachusetts Photographs Documented June 17, 2025 Photo 10 View of hydroseed on an area of exposed soil– facing north-east. View of an area of exposed soil and a soil stockpile with erosion controls in good condition down -gradient (Facing north to Courtland Way) Photo 9 PHOTOGRAPHIC DOCUMENTATION Yarmouth Riverwalk Yarmouth, Massachusetts Photographs Documented June 17, 2025 View of autumn olive outside of the limits of work adjacent to the erosion controls —facing west. Photo 11 View of bush honeysuckle outside of the limits of work adjacent to the erosion controls —facing west. Photo 12 PHOTOGRAPHIC DOCUMENTATION Yarmouth Riverwalk Yarmouth, Massachusetts Photographs Documented June 17, 2025 View of Japanese knotweed coming up along the limits of work—facing west. Photo 13 View of the population of bittersweet—facing west. Photo 14 Yarmouth Riverwalk Park — June 17, 2025 偨潴潳‵…‶ Yarmouth Riverwalk Park — June 17, 2025 偨潴漠㄰ 偨潴漠ㄱ 偨潴漠ㄲ 偨潴漠ㄳ 偨潴漠ㄴ