Attachment E - Wetland Map and Functional Evaluations

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www.FlatironsInc.com

Land Surveying Services

Flatirons, Inc.

Wetland Evaluation

STR: S 3&4, T1S, R70W

Investigator: David Steinmann

Date of Visit: 11/20/2024

Obs. Method: Onsite

General Location: South of the East Boulder Recreation Center next to 55th Street. Referred to as the Hogan Pancost Property. Description: This evaluation covers the emergent cattail wetlands within a topographically low drainage swale on the north part of the site west of 55th Street. The property is an open field that was previously heavily grazed with cattle and horses on the land. The majority of the land site is vegetated with non-native noxious weeds. The dominant wetlands vegetation in the low-functioning wetlands is cattails. Plains cottonwood trees, willow trees, ash trees, Russian olive trees, and willows grow at the site. Wetland Origin: Irrigation

Primary Water Source: Irrigation Ditch Flows and Seepage

Hydro-period: Seasonal

Max Water Depth: (ft): <1

Major Plant Communities Present: Cattails, Sedges, and Rushes

% of Wetland Area 100 %

% Vegetated: 92 % Bare ground: 8 % Water: 0.01

FUNCTION AND VALUE ASSESSMENT Ratings: 5 = very high, 4 = high, 3 = medium, 2 = low, 1 = no Confidence in rating: c = high, b = medium, a = low Groundwater Recharge

2

b

There is minor groundwater recharge after heavy rains and during snowmelt when water collects in the low spots and drainage swales where it can infiltrate into the ground.

Groundwater Discharge

2

b

There is no evidence of groundwater discharge because there are no seeps, springs, or streams on the site.

Flood Storage/Alteration

2

c

The site can store minor amounts of floodwater after heavy rains.

Shoreline Anchoring

1

c

No shorelines occur at the property.

Sediment Trapping/

2

c

There is modest sediment trapping during heavy rains.

Nutrient Retention (short-term)

2

c

Short term nutrient retention is expected in the drainage swales and within the areas of dense wetlands vegetation.

Nutrient Retention

2

c

Long-term woody debris accumulation was observed, with emergent wetlands and lush vegetation being able to trap and retain nutrients.

Food Chain Support (export)

1

b

There are no streams to export food chain support from the site.

Food Chain Support (within basin)

3

c

Vegetation, berries, rodents, and invertebrates provide food chain support.

Fish Habitat/Aquatic Diversity

1

c

There is no fish habitat or aquatic diversity due to the lack of streams.

Wildlife Habitat

3

c

Trees, shrubs, grasses, and flowers provide food and habitat for birds and wildlife such as deer, rodents, canines, raptors, songbirds and prairie dogs.

Active Recreation

1

c

Recreational use is currently non-existent. The area is fenced.

Passive Recreation/ Heritage Value

2

c

The site may be used for photography and to passively observe wildlife. There no heritage value to the wetlands.

Comments: The wetlands are isolated and are hydrologically supported by irrigation ditch seepage from the irrigation ditches that flow across the site. Wetland boundaries are defined by vegetation, soils, and topography. Noxious weeds are prevalent.

Wetland Evaluation

STR: S 3&4, T1S, R70W

Investigator: David Steinmann

Date of Visit: 11/20/2024

Obs. Method: Onsite

General Location: South of the East Boulder Recreation Center next to 55th Street. Referred to as the Hogan Pancost Property. Description: This evaluation covers the wet meadow wetlands on the south side of the property west of 55th Street, wetlands within several topographically low drainage swales on the west side, and wetlands adjacent to the active irrigation ditches associated with the property. The site is an open field that was previously heavily grazed with cattle and horses on the land. The majority of the site is vegetated with non-native noxious weeds. The dominant wetlands vegetation is sedges and cattails. Cottonwood trees, willow trees, ash trees, Russian olive trees, and shrubs are present. The Northern Leopard Frog may utilize these wetlands. Wetland Origin: Irrigation

Primary Water Source: Irrigation Ditch Flows and Seepage

Hydro-period: Seasonal

Max Water Depth: (ft): <1

Major Plant Communities Present: Cattails, Sedges, and Rushes

% of Wetland Area 100 %

% Vegetated: 92 % Bare ground: 8 % Water: 0.01

FUNCTION AND VALUE ASSESSMENT Ratings: 5 = very high, 4 = high, 3 = medium, 2 = low, 1 = no Confidence in rating: c = high, b = medium, a = low Groundwater Recharge

2

b

There is minor groundwater recharge after heavy rains and during snowmelt when water collects in the low spots and drainage swales where it can infiltrate into the ground.

Groundwater Discharge

2

b

There is no evidence of groundwater discharge because there are no seeps, springs, or streams on the site.

Flood Storage/Alteration

2

c

The site can store minor amounts of floodwater after heavy rains.

Shoreline Anchoring

1

c

No shorelines occur at the property.

Sediment Trapping/

2

c

There is modest sediment trapping during heavy rains.

Nutrient Retention (short-term)

2

c

Short term nutrient retention is expected in the drainage swales and within the areas of dense wetlands vegetation.

Nutrient Retention

2

c

Long-term woody debris accumulation was observed, with emergent wetlands and lush vegetation being able to trap and retain nutrients.

Food Chain Support (export)

1

b

There are no streams to export food chain support from the site.

Food Chain Support (within basin)

3

c

Vegetation, berries, rodents, and invertebrates provide food chain support.

Fish Habitat/Aquatic Diversity

1

c

There is no fish habitat or aquatic diversity due to the lack of streams.

Wildlife Habitat

4

c

Trees, shrubs, grasses, and flowers provide habitat for birds and wildlife such as deer, rodents, canines, raptors and songbirds. The Northern Leopard Frog may occur in the wet meadow wetlands and along the adjacent irrigation ditches.

Active Recreation

1

c

Recreational use is currently non-existent. The area is fenced.

Passive Recreation/ Heritage Value

2

c

The site may be used for photography and to passively observe wildlife. There no heritage value to the wetlands.

Comments: The wetlands are isolated and are hydrologically supported by irrigation ditch seepage from the irrigation ditches that flow across the site. Wetland boundaries are defined by vegetation, soils, and topography. Noxious weeds are prevalent.

Wetland Evaluation

Wetland #: 40901

Former #: 15 (in part)

Investigator:

Date of Visit:

Obs. Method: Onsite

A. Carpenter, C. Browne

General Location:

6/2/2004

T_R_S: T1SR70WS3

Ponds immediately south of East Boulder Recreation Center

Description: Two constructed ponds that encompass nearly 6 acres.

Wetland Origin: Urban/ industrial

Primary Water Source:

Hydroperiod:

Max WaterDepth (ft):

Permanently flooded

Major plant communities present plains cottonwood / mixed graminoid cattail wooly sedge / mixed graminoid mixed graminoid open water

Urban / industrial runoff

% of wetland area 2 1 1 1 95

FUNCTION AND VALUE ASSESSMENT Ratings: 5 = very high, 4 = high, 3 = medium, 2 = low, 1 = no

% Vegetated: 1 % Bare ground: 0 % Water: 99

Confidence in rating: c = high, b = medium, a = low

Groundwater Recharge

2

b

Groundwater Discharge

2

c

Flood Storage / Floodflow Alteration

2

c

Shoreline Anchor. / Stabilization

2

b

Sediment Trapping / Retention

3

b

Nutrient Retention (long-term)

3

b

Nutrient Retention (short-term)

3

b

Food Chain Support (export)

2

b

low opportunity due to controls

Food Chain Support (within basin)

2

b

mowed to edges

Fish Habitat / Aquatic Diversity

3

c

Wildlife Habitat

2

b

geese, but human activity and dogs probably reduce effectiveness of area for wildlife

Active Recreation

5

c

Frequent use of ponds in dog park area

Passive Rec / Heritage Value

4

b

Rec. center visitors

Comments:

margins partially manicured (with some unmaintained areas) resident Canada goose population

Wetland Evaluation

STR: S04, T1S, R70W

Investigator: Cat McIntyre

Date of Visit: 8/28/25

Obs. Method: Onsite

General Location: South of East Boulder Recreation Center and East of 55th Street. Description: The Hogan Pancost property managed by Open Space Mountain Parks is located east of 55th Street. Wetland Origin: Irrigation/Natural Hydro-period: Semipermanently flooded

Primary Water Source: Irrigation/GW Max Water Depth: (ft): 1

Major Plant Communities Present: Sedges and rushes

% of Wetland Area 100 %

% Vegetated: 94 % Bare ground: 1 % Water: 5

FUNCTION AND VALUE ASSESSMENT Ratings: 5 = very high, 4 = high, 3 = medium, 2 = low, 1 = no Confidence in rating: c = high, b = medium, a = low Groundwater Recharge

2

b

There is some groundwater recharge following precipitation events.

Groundwater Discharge

3

b

Groundwater discharge is likely attributing to the small pond located on site and hydrology may be influenced by flow in South Boulder Creek and ditch seepage

Flood Storage/Alteration

3

c

The site provides some flood storage.

Shoreline Anchoring

1

c

No shorelines are present at the site.

Sediment Trapping/ Retention

2

c

There is modest and temporary sediment trapping during rain events

Nutrient Retention (short-term)

4

c

Short term nutrient retention is expected in areas of standing water and where there is dense emergent wetland vegetation.

Nutrient Retention (long-term)

4

c

Emergent wetland vegetation, litter and soil throughout the site is expected to trap nutrients long term.

Food Chain Support (export)

2

c

The ditch that flows through the site acts as an export for food chain support

Food Chain Support (within basin)

4

b

Wetland vegetation, microorganisms, invertebrates, and rodents create food chain support.

Fish Habitat/Aquatic Diversity

1

c

No fish habitat is on site.

Wildlife Habitat

4

b

Riparian trees and emergent grasses, sedges and rushes provide food and habitat for birds and wildlife, and Howard Ditch serves as a wildlife corridor.

Active Recreation

1

c

Site is not used for recreation.

Passive Recreation/ Heritage Value

2

c

The site is adjacent to a pedestrian trail used for walking and biking so may be used for passive observation of nature and wildlife.

The Wetland is High Functioning IF the total additive value is greater than or equal to 26 (excluding recreation) OR any value is 4 or 5 (except recreation) The Wetland is Low Functioning IF the total additive value is less than or equal to 25 (excluding recreation)