HomeMy WebLinkAboutHIDDEN POND ESTATES - PDP - 11-07 - REPORTS - ENVIRONMENTAL REPORTCollins. It is likely the existing great horned owl nest would continued to be used as long as the nest tree
remains and open space remains available to the east for hunting. Current development plans would not
impact the existing nest tree and a majority of the open space on the property would remain as open
space.
• Development setback of 25 feet for farmstead windbreaks or woodlots
There would be no development within 25 feet of the line of Siberian elm and eastern cottonwood
windbreak trees west and north of the existing farmhouse.
Based on this analysis, the proposed Feather Ridge Project would be in compliance with all City Natural
Habitats and Features buffer zone and habitat protection standards. Significant trees and natural habitat
features including the wetlands, pond, and surrounding habitats would be preserved with project
development. Project development would only occur within existing disturbed or non-native
grassland/weedy areas.
One final mitigation recommendation is provided for the Feather Ridge Property to enhance existing
wildlife habitats on the property. It is recommended that additional plantings of appropriate native
herbaceous and woody vegetation species be made over time around the wetland features and pond.
Young and poor quality Siberian elms should also be slowly replaced with native woody plantings, but
existing nuisance trees should be left in place until they are matched in structure and size by replacement
tree plantings. With additional native woody plantings, wetland and pond habitat could be enhanced and
should attract a diversity of songbirds as well as continue to provide potential breeding habitat for local
amphibian populations. Non-native grassland areas, especially those supporting higher densities of
weedy species could also be cleared and replanted to native grass and herbaceous species to further
enhance habitat conditions in open space portions of the property.
14
A number of City of Fort Collins Buffer Zone Standards and wildlife habitat protection stipulations could
potentially apply to the Feather Ridge Property. The following paragraphs provide a discussion of the
proposed development's compliance with each potentially applicable buffer zone or habitat protection
standard.
50-foot setback for ditches that serve as wildlife movement corridors.
Based on this report's analysis, the Fossil Creek Reservoir Inlet Canal has minimal value as a potential
wildlife movement corridor for terrestrial wildlife because of the lack of suitable vegetation cover, close
proximity to roads and grazed pastureland, and cement box culvert road crossings. However, as
development in the area continues, the canal may play a more important role as a movement corridor
especially if development landscaping creates increased vegetation diversity along the canal. Therefore,
it may be appropriate to preserve a 50-foot buffer along the canal. Plantings of native woody species
within the 50-foot buffer would improve habitat diversity along the ditch as well as provide visual shielding
between the ditch and development. Current development plans indicate a development setback of at
least 250 feet would be maintained from the Fossil Creek Reservoir Inlet Canal.
• Protection of prairie dog towns over 50 acres is size
The prairie dog town on the property is much smaller than 50 acres. The City requires that for any
development within an existing prairie dog town, prairie dogs within the disturbance area would need to
be relocated or eradicated using city -approved methods as described in Chapter 4 of the Land Use Code.
The requirement would apply to the portion of the proposed parking lot overlapping occupied prairie dog
habitat, as well as possible disturbance from detention pond construction.
Minimum development setback of 50 feet for wetlands larger than 0.25 acre but less than 0.3 acre
in size
All wetland areas on the Feather Ridge Property are less than 0.2.5 acre in size, and there are no specific
City buffer zone standards that apply to wetlands of this size. However, current development plans
indicate a minimum development setback of 60 feet or more would be maintained from all identified
wetlands.
Minimum development setback of 50 feet for naturalized detention or irrigation ponds
Development plans indicate a minimum development setback of 60 feet or more would be maintained
from the only pond located on the property.
Protection of raptor nest sites
There are no City buffer standards for protection of great horned owl nest sites. Great horned owls are
well adapted to nesting in urban environments and are known to nest within downtown areas of Fort
13
(e) There are two natural drainages on the property. The drainage flowing into the pond is intermittent
above the pond and only carries water during storm events. Below the pond the drainage appears to be
perennial due to seepage from the pond. The other drainage is the small channel that carries flow from
the spring wetland into Fossil Creek Reservoir Inlet Canal (see Figure 2).
(f) Because of past agricultural conversion of the property, there is no evidence of the presence of
specially valued species or their habitats within the property boundaries. The small wetland sites on the
property do not provide suitable habitat conditions for Preble's meadow jumping mouse (Zapus
hudsonius preblet) or Ute ladies' -tresses orchid (SpiranMes diluvialis). One large Siberian elm was used
for nesting by great horned owls in 2003 (see Figure 2).
(g) Because of past disturbances and development, special habitat features on the property are limited to
the pond, small wetland sites, and larger trees. The flowing spring and spring fed wetland drainage is a
rather unique habitat feature for the Fort Collins area.
(h) The Fossil Creek Reservoir Inlet Canal is hydrologically linked to the Cache la Poudre River and Fossil
Creek Reservoir, but the canal has minimal value as wildlife habitat and a potential wildlife movement
corridor for the following reasons. The canal has lack of continuity with other natural areas. The north end
of the canal is connected to the Cache la Poudre River riparian corridor to the north of the property, but
south of the river it passes through considerable pastureland and cropland with little suitable vegetation
cover and wildlife habitat value before emptying into Fossil Creek Reservoir. Culverted crossings under
Horsetooth Road to the north and Harmony Road to the south also disrupt the continuity of the canal,
minimizing its value as a potential movement corridor for terrestrial species.
(i) The general ecological functions provided by the Feather Ridge Property are described under Section
3.0.
5.0 WILDLIFE AND HABITAT MITIGATION RECOMMENDATIONS
Development plans for the Feather Ridge Property would involve the conversion of portion of the
property to a reception center and parking areas. Current plans indicate the existing farmhouse and most
of the farm buildings would remain on site. Development would occur entirely within areas dominated by
farm facilities and non-native grassland/weedy habitats. Currently there are no plans to remove any of the
larger trees unless they pose a safety risk for people using the property. The only trees that would be lost
to development would be a few of the small Siberian elms. The pond and wetlands, as well as surrounding
trees would be unaffected by development and would remain as open space on the property. As currently
proposed, a minimum development setback of at least 60 feet or more would be maintained from the
existing wetlands and pond. A small portion of the existing prairie dog town would be impacted by parking
lot development.
IVA
stands except that there is sufficient surface water at the pond and flowing water wetlands to provide
suitable breeding habitat for amphibians such as chorus frog and Woodhouse's toad. The pond and
flowing water wetlands also provides a drinking water source for terrestrial wildlife species using the
adjacent non-native grassland and disturbed/weedy habitat areas as well as foraging areas for species
such as raccoon. The pond and adjacent wetlands could also be used for foraging and nesting by urban
adapted waterfowl such as Canada goose and mallard as well as provide nesting habitat for songbird
species such as red -winged blackbird and song sparrow.
3.4 Fossil Creek Reservoir Inlet Canal
The Fossil Creek Reservoir Inlet Canal runs along the eastern property boundary. This 12 to 15-foot wide
canal supports a relatively narrow strip of wetland vegetation (primarily reed canarygrass) below the
embankment edge. The upper, non -wetland portions of the ditch embankment are vegetated primarily by
smooth brome and annual weeds. To the north of the Feather Ridge Property, the canal passes through
grazed pastureland. South of the property the canal flows through cement box culverts under Harmony
Road and eventually empties into Fossil Creek Reservoir.
4.0 ECOLOGICAL STUDY CHARACTERIZATION CHECKLIST
The following provides a summary of information required by Fort Collins Land Use Code under 3.4.1 (D)
(1) items (a) through (i). Items Q) and (k) are addressed under following section, 5.0 Wildlife Mitigation
Recommendations.
(a) Wildlife use of the area is described in Section 3.0.
(b) Four small wetlands are supported on the property. Their characteristics and ecological functions are
described in Section 3.3. Wetland locations are depicted on Figure 2.
(c) No views of significant topographical features are provided from the property, although the more
elevated portions of the property provide relatively panoramic views to the east.
(d) Because of past agricultural conversion of the property, there are no significant stands of native
vegetation. The only significant native trees on the property are the five cottonwoods north of the
farmhouse. The non-native green ash and Engelmann spruce trees would also likely be classified as
significant by the City of Fort Collins Forester. Siberian elms and Russian olive trees growing on the
property are classified as nuisance species by the City of Fort Collins. However, most of the larger
Siberian elms planted west and south of the farmhouse are large well -developed trees that create
considerable nesting and perching habitat for a variety of songbirds. The locations of these trees are
noted on Figure 2.
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December field survey were northern flicker, black -billed magpie, house finch, American goldfinch, and
sharp -shinned hawk, a winter visitor. A much more diverse assemblage of songbird species is likely to be
present during the spring and summer.
3.3 Pond and Wetlands
There are four small wetland areas and a pond located on the Feather Ridge Property. Three of these
wetlands are located within the pond drainage above and below the pond and around the pond perimeter.
The upper wetland, west of the pond is located upstream of a dirt embankment dam, and this area may
contain some standing water in wetter years. However, it is currently dominated by a dense stand of a
single wetland species, reed canarygrass (Phalaroides arundinacea) (see Photo 6). This wetland is not
connected by continuous wetland or defined channel to Waters of the United States and would not be
considered jurisdictional by the U. S. Army Corps of Engineers.
A second wetland area is supported as a narrow, intermittent band around the pond perimeter. These
pond perimeter wetlands are dominated by broad-leaved cattail (Typha latifolia) and saltmarsh bulrush
(Bolboschoenus maritimus) near the water's edge and by reed canarygrass and three -square
(Schoenoplectus pungens) in the less saturated zones. A view of the pond and peripheral wetlands is
provided by Photo 7. The wetland drainage below and east of the pond dam supported a small channel of
flowing water at the time of the December survey, apparently from pond water seepage below the dam.
Wetland vegetation in this channel is dominated by reed canarygrass with minor amounts of watercress
(Nasturtium officinale) growing in the flowing water channel. Photo 8 provides a view of the upper end of
this wetland immediately below the dam embankment. Water from this wetland flows through a pipe over
the Fossil Creek Reservoir Inlet Canal and apparently into a constructed pond on an adjacent property.
However, some of the water flow was leaking from the pipe into the canal, and the pond and wetland
drainage below the pond may be considered jurisdictional by the U. S. Army Corps of Engineers.
The fourth wetland area is supported by a small, flowing spring near the middle of the eastern property
boundary (see Figure 2). The flowing spring and associated wetland drainage consists of a small pool of
water where flows emit from the ground and a narrow wetland drainage that carries the spring flow directly
into the Fossil Creek Reservoir Inlet Canal. At the time of the December survey the spring was estimated
to be flowing at approximately 1 gallon per minute (gpm). The Fossil Creek Reservoir Inlet Canal flows into
Fossil Creek Reservoir, and the U.S. Army Corps of Engineers would classify wetlands connected to the
canal as jurisdictional. Characteristics of this wetland drainage are similar to the wetland below the pond
dam.
The pond, in combination with the adjacent wetlands and tree stands, create considerable habitat diversity
in an area otherwise dominated by non-native grassland/weedy areas and developed sites. Wildlife use of
the pond and small wetlands is similar to that described for adjacent areas of non-native grassland and tree
10
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Photo 7. View of Pond and Surrounding Peripheral Wetlands. (View is from the pond dam
looking west or upstream. (Tree in middle background on right is Russian olive. Most
other trees in background are Siberian elms.)
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Photo 8. View of Wetland Channel Below Pond Dam. (View is from pond dam looking
east. Small trees are Russian olives.)
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Photo S. View of Trees at Upper Dam Embankment. (Trees on left or west side of embank-
ment are young cottonwoods. Trees on right or east side of embankment are young
Siberian elms.)
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Photo 6. View of Upper Wetland Area Upstream of Pond. (Reed canarygrass is the
dominant wetland vegetation. Trees on both sides are dominated by young Siberian elms
but a few young cottonwoods are also present.)
9
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Photo 3. View of Line of Five Large Cottonwoods North of Farmhouse. (View is looking
west toward east end of cottonwoods. Trees in background on right are young Siberian
elms.)
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Photo 4. View of Line of Large Siberian Elms West of Farmhouse. (View is looking north
toward south end of trees.)
7
Photo 1. View of Non-native Grassland Habitat Dominated by Smooth Brome. (View is
from southeast property corner looking west.)
Photo 2. Another View of Non-native Grassland. (View is from near center of property
looking southeast toward prairie dog area. Overgrazed prairie dog area is in middle
background on the right.)
0
Figure 2) weedy species including field bindweed, kochia, Canada thistle and cheatgrass are more
dominant. Woody vegetation in non-native grassland is restricted to a few widely scattered rubber
rabbitbrush (Chrysothamnus nauseosus) shrubs near the southeast property corner and a number of tree
stands (see Section 3.2). Photos 1 and 2 provide representative views of non-native grassland on the
Feather Ridge property.
Habitat value and wildlife use of non-native grassland habitat is limited because of low vegetation species
diversity, past livestock use, dominance by weedy and non-native grass species, and surrounding
developments. However trees and the pond on the property as well as the prairie dog town increases
overall habitat diversity and possible use of the site by raptors and mammalian predators. Deer mouse,
thirteen -lined ground squirrel, prairie vole, northern pocket gopher, black -tailed prairie dog, and western
meadowlark are the only species likely to establish resident populations in non-native grassland.
Songbirds such as Brewer's blackbird, common grackle, and black -billed magpie may also occasionally use
non-native grassland habitat. Species such as striped skunk, coyote, and red fox will hunt prey in urban
areas of non-native grassland. Raptors known to hunt over non-native grassland habitats near urban areas
include American kestrel, red-tailed hawk, and great horned owl.
3.2 Trees
The distribution of trees on the property and species identification are noted on Figure 2. The larger,
more significant trees are also identified on Figure 2. The dominant trees on the property are Siberian elm
(Ulmus pumila) and eastern cottonwood (Populus deltoides). The largest and most significant of these
trees grow as linear plantings to the north and west of the farmhouse. The majority of the large Siberian
elms appeared to be in good health with few larger dead branches evident. In contrast, two of the five
large cottonwoods to the north of the farmhouse appeared to be partially to mostly decadent. Outside of
the farmstead area, the remaining Siberian elms and cottonwoods are relatively young trees (4 to 8 inches
in diameter) that appeared to be healthy. The only other trees noted on the property were a few Russian
olives (Elaeagnus angustifolia) at the pond perimeter and five green ash (Fraxinus pennsylvanicus) and
two Englemann spruce (Picea englemannil) trees growing within landscaped portions of the farmstead.
All of these trees except for eastern cottonwood are non-native to the Fort Collins area. Russian olive and
Siberian elm are classified as nuisance species by the City of Fort Collins. Photos 3, 4, 5, 6, and 7 provide
representative views of tree stands on the property.
Trees on the property create additional habitat diversity and vegetation structure primarily for use by
urban -adapted songbirds for foraging, perching, and nesting. The trees could also be occasionally used
by raptors such as red-tailed hawk and great horned owl as potential nest or hunting perch sites.
According to the property resident, the Siberian elm immediately southeast of the farmhouse was used for
nesting by great horned owl during the 2003 breeding season. No other evidence of raptor nesting
activity was noted in any of the other trees. Species noted using trees on the property during the early
6-1- , CAL 0,,< .
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Hewlett Packard
map
4
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FIGURE 2
Habitat Mapping
for the
Feather Ridge
Property
LEGEND
Property Boundary
Habitat Boundary
NNG = Non-native
Grassland
RES = Residential
FB = Farm Building
Scale: 1 inch = -140 feet I
(.µ,. FIGURE^2
o Habitat Mapping
��•.' µ e �h9 for the
Feather Ridge
�f Property
Siberian
elms young cottonwoods N \ LEGEND
N„
Siberian elm &„ Agricultural Property Boundary
"-<+• �iFk, NNG r NNG Wetland
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/ Rural Residential
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y Wetland_ Pd NNG = Non-native
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§Ellis•
FB =Farm Building
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4
3.0 HABITAT CONDITIONS AND WILDLIFE USE
According to the Soil Survey of Larimer County Area, Colorado (SCS 1980), Nunn clay loam, 1 to 3
percent slopes, and Larimer-Stoneham complex, 3 to 10 percent slopes, are the two main soil mapping
units present on the Feather Ridge Property. Longmont clay, 0 to 3 percent slopes, is present in the
northeast property corner. Nunn clay loam and Larimer-Stoneham complex are not classified as hydric
(wetland) by the SCS. Nunn clay loam is located in the southwest portion of the property while the
Larimer-Stoneham complex occupies the remainder of the property. Longmont clay is classified as hydric
by the SCS, but the only wetlands located on the property are associated with the drainage into and out of
the pond on the property as well as a small spring. Both upland soil mapping units are deep and well
drained. The Longmont clay is poorly drained. Runoff is medium to rapid on the Larimer-Stoneham
complex and the erosion hazard is rated as moderate to severe with the higher erosion hazards on the
steeper slopes. Runoff is slow to medium on Nunn clay loam and the water erosion hazard is rated as
moderate, while runoff is slow and erosion hazard is slight on Longmont clay. No problem erosion areas
were noted on the property during the field survey.
Topography of the project site is gently to moderately sloping to the east and northeast. The Fossil Creek
Reservoir Inlet Canal runs along the east side of the property. Current habitats within the Feather Ridge
Property consist of non-native grassland, weedy, tree stands, pond, and small wetland areas (see Figure
2). The remainder of the property is occupied by a farmhouse and farm buildings and associated corrals
and landscaping. Surrounding land uses and habitats are dominated by rural residential, urban residential,
and commercial developments. The only sensitive habitat areas or features on or near the property are
mature trees, irrigation ditch, a small pond, and small wetland areas. The following sections summarize the
characteristics of habitats on the property and wildlife use of the site.
3.1 Non-native Grassland and Weedy Areas
Non-native grassland and weedy areas dominate the majority of the property as a result of past habitat
conversions to farm and livestock uses (see Figure 2). Dominance by non-native grass and weedy
species varies throughout the property depending on past land use practices and the presence of prairie
dogs. Throughout most of the property, smooth brome (Bromopsis inermis)t is the dominant non-native
grass intermixed with varying amounts of crested wheatgrass (Agropyron cristatum), intermediate
wheatgrass (Thinopyrum intermedium), tall fescue (Festuca arundinacea), and weedy species including
cheatgrass (Anisantha tectorum), field bindweed (Convolvulus arvensis), flixweed (Descurainia sophia),
kochia (Bassia sieversiana), musk thistle (Carduus nutans), and Canada thistle (Breea arvensis).
Dominance by crested wheatgrass was greater in non-native grass areas near the corrals and north and
east of the farmstead. In the abandoned corral areas and the small black -tailed prairie dog town (see
t Scientific nomenclature follows: Weber, W. A. and R. C. Wittmann. 1996. Colorado Flora Eastern Slope, revised
edition. University Press of Colorado, Niwot, Colorado. 524 pp.
9
No Text
ECOLOGICAL CHARACTERIZATION STUDY REPORT
FOR THE FEATHER RIDGE PROPERTY
1.0 INTRODUCTION AND LOCATION
This report provides an evaluation of wildlife habitat conditions in and within 500 feet of the Feather Ridge
Property in accordance with Section 3.4.1 of the Land Use Code of the City of Fort Collins regarding the
preparation of an Ecological Characterization Study Report for properties proposed for development. The
development proposal for the Feather Ridge Property includes the construction of 9,000 square -foot
reception center, parking areas, upgraded access driveway, and associated landscaping. The parcel of
land addressed by this report consists of approximately 15 acres of rural farm property bordered on the
south by Hewlett-Packard, on the east by the Fossil Creek Reservoir Inlet Canal, and on the north and
west by existing residential developments. The property is located near the center of the eastern 1/2 of
Section 33 (T. 7 N., R. 68 W.), and the property location is depicted on Figure 1.
This report summarizes the findings of the field evaluation, documents environmental conditions and
habitats on the property, discusses potential impacts associated with the proposed development, and
provides recommendations for mitigation.
2.0 METHODOLOGY
Cedar Creek completed a field survey of the proposed development parcel on December 3, 2003. The
field survey was conducted to characterize existing wildlife habitats, as well as identify any unique or
sensitive natural resource features. Prior to the initiation of the field survey, Natural Resources
Conservation Service (formerly SCS) soils mapping (Soil Survey of Larimer County Area, Colorado) was
reviewed to determine if any known hydric (wetland) or highly erosive soil mapping units are located on the
property. Observations recorded during the field evaluation included: major vegetation communities /
wildlife habitats present within the property; dominant vegetation associated with each community /
habitat; unique habitat features; and observations of wildlife species and/or definitive sign. Photographs
showing representative views of existing habitats were also taken to document site conditions. Wildlife
presence and habitat use was based on on -site observations and habitat presence in conjunction with the
known habitat requirements of potential wildlife species. Existing habitats were also evaluated regarding
their ability to support populations of threatened, endangered, and other sensitive plant and wildlife
species.
TABLE OF CONTENTS
Page
1.0 Introduction and Location...........................................................................................................1
2.0 Methodology.............................................................................................................................1
3.0 Habitat Conditions and Wildlife Use..............................................................................................3
3.1 Non-native Grassland and Weedy Areas.................................................................................3
3.2 Trees...................................................................................................................................5
3.3 Pond and Wetlands............................................................................................................10
3.4 Fossil Creek Reservoir Inlet Canal........................................................................................11
4.0 Ecological Study Characterization Checklist...............................................................................11
5.0 Wildlife and Habitat Mitigation Recommendations........................................................................12
ECOLOGICAL CHARACTERIZATION STUDY REPORT
FOR THE FEATHER RIDGE PROPERTY
Prepared
by
Cedar Creek Associates, Inc.
Fort Collins, Colorado
Prepared
for
Julle Baker & V.F. Ripley Associates, Inc.
Fort Collins, Colorado
June 7, 2004
(MEDAM
ASSOCHAIrmfl INC. q_41-
916 Willshire Ave., Fort Collins, CO 80621 • (970) 493-4394