FINAL ENVIRONMENTAL ASSESSMENT
KAPUNA WATERSHED PROTECTION PROJECT
PAHOLE NATURAL AREA RESERVE
Kapuna and Keawapilau Drainages
Pahole Natural Area Reserve & Mokuleia Forest Reserve
Waialua District
Northern Wai‘anae Mountains
Island of O‘ahu
In accordance with
Chapter 343, Hawai‘i Revised Statutes
Proposed by:
State of Hawai‘i
Department of Land and Natural Resources
Division of Forestry and Wildlife
Natural Area Reserves System
1151 Punchbowl Street, Room 224
Honolulu, Hawai‘i 96813
October 2003
Project Name Kapuna Watershed Protection Project
Pahole Natural Area Reserve
Project Location Kapuna and Keawapilau Drainages
Pahole Natural Area Reserve/Mokuleia Forest Reserve
Waialua District
Northern Wai‘anae Mountains
Island of O‘ahu
TMK 1-6-8-001-002 (State of Hawai‘i) (Pahole NAR)
TMK 1-6-8-001-001 (State of Hawai‘i) (Mokuleia FR)
Land Use Conservation District, Protective Subzone
Proposing Agency State of Hawai‘i
Department of Land and Natural Resources
Division of Forestry and Wildlife
Natural Area Reserves System
Approving Agency State of Hawai‘i
Department of Land and Natural Resources
Agencies Consulted Federal: U.S. Army Garrison, Hawai‘i
U.S. Department of Agriculture, Natural
Resources Conservation Service
U.S. Department of Interior, Fish and
Wildlife Service
U.S. Geological Survey, Biological
Resources Division
State: Department of Agriculture
Department of Business, Economic
Development and Tourism, Office of Planning
Department of Defense
Department of Hawaiian Home Lands
Department of Health
Department of Land and Natural Resources
Division of Conservation and
Resource Enforcement
Division of Forestry and Wildlife
Division of Historic Preservation
Division of Land Management
Division of State Parks
NARS Commission
Office of Conservation and Coastal
Lands
Land Use Commission
Office of Hawaiian Affairs
2
Office of Environmental Quality Control
University of Hawai‘i, Dr. Michael
Hadfield
University of Hawai‘i, Environmental
Center
County: Board of Water Supply
Department of Planning and Permitting
North Shore Neighborhood Board
Wahiawa Neighborhood Board
Waianae Neighborhood Board
Private: Ahahui Malama I Ka Lokahi
Bishop Museum
Conservation Council of Hawai‘i
Earthjustice Legal Defense Fund
Hawai‘i Audubon Society
Hawai‘i Trail and Mountain Club
Historic Hawai‘i Foundation
Ilio‘ulaokalani Coalition
Kahea – the Hawaiian Environmental
Alliance
Ko‘olau Mountains Watershed Partnership
O‘ahu Invasive Species Committee
Pig Hunters Association of O‘ahu
Sierra Club, Oahu Chapter
The Nature Conservancy of Hawai‘i
Waialua Hawaiian Civic Club
Waianae Hawaiian Civic Club
Steve Montgomery
Jonah Ioane
Summary of Action
The Hawai‘i Department of Land and Natural Resources, Division of
Forestry and Wildlife proposes to construct a network of fences in the
uppermost portion of the Kapuna and Keawapilau drainages, between the 1,500
and 2,590 foot elevation, in the Pahole Natural Area Reserve and extending
slightly into the Mokuleia Forest Reserve, in the northern Wai‘anae Mountains
on the island of O‘ahu. By eliminating the destructive impact of feral pigs in
the project area, this project is directed at the protection of the watershed as
well as rare and endangered species.
The proposed fencing will have a combined length of approximately 3.5
miles, enclosing approximately 235 acres. The proposed action is part of an
ongoing effort by DOFAW, USFWS, the United States Army, hunting clubs, and
community volunteers to protect native ecosystems, watershed, and habitat for
native species. At least eighteen species of listed, proposed, candidate or rare
3
plants and several rare and/or endangered native snail species are found in the
project area.
Fence construction will involve hand clearing of a corridor no more than
10 feet wide and erecting a fenceline. The planned fence will be approximately
three feet tall, made of hogwire. Where necessary, the outside of the fence will
be skirted along the base with a hogwire apron. Management activities planned
after the fence is completed include feral animal and weed control and
outplanting of native species to restore the dryland forest.
Potential impacts include short-term increase in soil disturbance along the
fenceline, disturbance and damage to common native plants, and effects on rare
and endangered plant and animal species, cultural resources, public hunting, and
the Mokuleia Trail. Impact mitigation measures include conducting expert
surveys of the fence route to ensure that no biological or cultural resources are
within the fence clearing corridor, implementing measures to decrease the
potential for accidental introduction of non-native species, and retaining the
integrity of the Mokuleia Trail.
II. PROJECT PURPOSE & NEED
The Hawaiian Islands are known as the endangered species capital of the
world. Approximately half the native rain forest and 90 percent of the native
dry forest in Hawai‘i have been lost. Over one-third of the threatened and
endangered species in the United States are unique to Hawai‘i, and more plant
and bird extinctions have been recorded from the islands than anywhere else in
the country.
The Natural Area Reserves System (NARS) was established in 1970 by the
State Legislature to “preserve in perpetuity specific land and water areas which
support communities, as relatively unmodified as possible, of the natural flora
and fauna, as well as geological sites, of Hawaii.” Chapter 195, HRS. The 658-
acre Pahole Natural Area Reserve was established in 1981 to protect rare
lowland native mesic and dry forest and habitat for endangered species. Pahole
Natural Area Reserve supports the endangered O‘ahu ‘elepaio (
sandwichensis ibidis
at least 18 species of endangered plants, candidate plants, and plant species of
concern, and additional native species of plants and animals.
The Forest Reserve System was established in 1903 to protect the vital
mountain watersheds. The Mokuleia Forest Reserve surrounds Pahole Natural
Area Reserve and also supports the endangered O‘ahu ‘elepaio as well as
various species of rare, threatened and endangered plants.
The proposed action focuses on protecting some of the best examples of
lowland native mesic forest remaining in the Hawaiian Islands. Protecting and
actively managing native ecosystems on a landscape level is necessary to secure
the long-term viability of these systems and to recover endangered species. The
4
ecosystem approach to managing the Pahole Natural Area Reserve is consistent
with the NARS mandate to protect natural communities in perpetuity. This
strategy is also consistent with the USFWS policy of protecting large, intact,
native ecosystems whenever possible.
The proposed action will reduce the negative impacts of feral pigs on
native forest, watershed, and habitat for native plants and animals, including
endangered species. The installation of a ridgeline fence by the U.S. Army
Garrison Hawai‘i along the entire southeastern border of the Reserve and
continuing east on the crest of West Makaleha Gulch has resulted in a dramatic
increase in feral pig activity in the upper Kapuna and Keawapilau drainages.
Feral pigs pose a major threat by consuming and destroying native understory
plants, creating conditions favoring non-native plant infestation and
establishment, preventing the establishment of ground-rooting native plants, and
disrupting soil nutrient cycling. The cumulative effect of these activities is the
decline of native forests, watersheds, and suitable habitat for native plants and
animals.
The proposed action will enhance the Wai‘anae Mountains watershed,
which serves the North Shore and Leeward O‘ahu communities. Fencing and
removing feral pigs will enhance surface and ground water resources by
reducing soil erosion and runoff.
The project area, Pahole Natural Area Reserve and Mokuleia Forest
Reserve, is State owned land within the Conservation District, which triggers
the need for an Environmental Assessment to be written in accordance with
Chapter 343, HRS.
Chasiempis), the endangered O‘ahu tree snail (Achatinella mustelina),I. SUMMARY
Replies
Summary of Action
The Hawai‘i Department of Land and Natural Resources, Division of
Forestry and Wildlife proposes to construct a network of fences in the
uppermost portion of the Kapuna and Keawapilau drainages, between the 1,500
and 2,590 foot elevation, in the Pahole Natural Area Reserve and extending
slightly into the Mokuleia Forest Reserve, in the northern Wai‘anae Mountains
on the island of O‘ahu. By eliminating the destructive impact of feral pigs in
the project area, this project is directed at the protection of the watershed as
well as rare and endangered species.
The proposed fencing will have a combined length of approximately 3.5
miles, enclosing approximately 235 acres. The proposed action is part of an
ongoing effort by DOFAW, USFWS, the United States Army, hunting clubs, and
community volunteers to protect native ecosystems, watershed, and habitat for
native species. At least eighteen species of listed, proposed, candidate or rare
3
plants and several rare and/or endangered native snail species are found in the
project area.
Fence construction will involve hand clearing of a corridor no more than
10 feet wide and erecting a fenceline. The planned fence will be approximately
three feet tall, made of hogwire. Where necessary, the outside of the fence will
be skirted along the base with a hogwire apron. Management activities planned
after the fence is completed include feral animal and weed control and
outplanting of native species to restore the dryland forest.
Potential impacts include short-term increase in soil disturbance along the
fenceline, disturbance and damage to common native plants, and effects on rare
and endangered plant and animal species, cultural resources, public hunting, and
the Mokuleia Trail. Impact mitigation measures include conducting expert
surveys of the fence route to ensure that no biological or cultural resources are
within the fence clearing corridor, implementing measures to decrease the
potential for accidental introduction of non-native species, and retaining the
integrity of the Mokuleia Trail.
II. PROJECT PURPOSE & NEED
The Hawaiian Islands are known as the endangered species capital of the
world. Approximately half the native rain forest and 90 percent of the native
dry forest in Hawai‘i have been lost. Over one-third of the threatened and
endangered species in the United States are unique to Hawai‘i, and more plant
and bird extinctions have been recorded from the islands than anywhere else in
the country.
The Natural Area Reserves System (NARS) was established in 1970 by the
State Legislature to “preserve in perpetuity specific land and water areas which
support communities, as relatively unmodified as possible, of the natural flora
and fauna, as well as geological sites, of Hawaii.” Chapter 195, HRS. The 658-
acre Pahole Natural Area Reserve was established in 1981 to protect rare
lowland native mesic and dry forest and habitat for endangered species. Pahole
Natural Area Reserve supports the endangered O‘ahu ‘elepaio (
sandwichensis ibidis
at least 18 species of endangered plants, candidate plants, and plant species of
concern, and additional native species of plants and animals.
The Forest Reserve System was established in 1903 to protect the vital
mountain watersheds. The Mokuleia Forest Reserve surrounds Pahole Natural
Area Reserve and also supports the endangered O‘ahu ‘elepaio as well as
various species of rare, threatened and endangered plants.
The proposed action focuses on protecting some of the best examples of
lowland native mesic forest remaining in the Hawaiian Islands. Protecting and
actively managing native ecosystems on a landscape level is necessary to secure
the long-term viability of these systems and to recover endangered species. The
4
ecosystem approach to managing the Pahole Natural Area Reserve is consistent
with the NARS mandate to protect natural communities in perpetuity. This
strategy is also consistent with the USFWS policy of protecting large, intact,
native ecosystems whenever possible.
The proposed action will reduce the negative impacts of feral pigs on
native forest, watershed, and habitat for native plants and animals, including
endangered species. The installation of a ridgeline fence by the U.S. Army
Garrison Hawai‘i along the entire southeastern border of the Reserve and
continuing east on the crest of West Makaleha Gulch has resulted in a dramatic
increase in feral pig activity in the upper Kapuna and Keawapilau drainages.
Feral pigs pose a major threat by consuming and destroying native understory
plants, creating conditions favoring non-native plant infestation and
establishment, preventing the establishment of ground-rooting native plants, and
disrupting soil nutrient cycling. The cumulative effect of these activities is the
decline of native forests, watersheds, and suitable habitat for native plants and
animals.
The proposed action will enhance the Wai‘anae Mountains watershed,
which serves the North Shore and Leeward O‘ahu communities. Fencing and
removing feral pigs will enhance surface and ground water resources by
reducing soil erosion and runoff.
The project area, Pahole Natural Area Reserve and Mokuleia Forest
Reserve, is State owned land within the Conservation District, which triggers
the need for an Environmental Assessment to be written in accordance with
Chapter 343, HRS.
Chasiempis), the endangered O‘ahu tree snail (Achatinella mustelina),The project involves constructing a network of fences around four habitat
management units that still support relatively intact native forest, watershed,
and habitat for native species. The habitat management units range in size from
eight to 207 acres. A perimeter fence will be installed around the fenced habitat
management units, protecting a total of approximately 235 acres. The fences
will be approximately three feet high with a combined length of approximately
3.5 miles.
The proposed fencing is located primarily within Pahole Natural Area
Reserve, but extends into a portion of the Mokuleia Forest Reserve to the east of
Pahole. The proposed fence line was selected based on the need to minimize
impacts of fence construction on native plant communities; ease of fence
installation and maintenance; and long-term survival of the fences from
vegetative encroachment, erosion, and slides.
The fences will be constructed on remote ridges dominated by non-native
plants to avoid disturbing sensitive species, slopes, and gulches. Helicopters
and existing trails and roads will be used to transport fence materials and crews.
A corridor no wider than 10 feet along the proposed fence line will be cleared
by hand and with small power tools, if necessary. The fences will be made of
steel and wood posts, hog wire, and a single strand of barbed wire along the
bottom of the fence to prevent feral pigs from entering the fenced areas. Where
necessary, the fences also will be skirted along the bottom of the fence with a
horizontal 24-inch wide wire apron.
The fenceline crosses the Mokuleia Trail in two locations. Gates or stiles
will be constructed at these locations to preserve access along the trail for
public users, such as hikers and hunters, and for resource managers conducting
management activities within the Natural Area Reserve.
Once the fences have been installed, feral pigs will be removed from the
fenced areas. A comprehensive threat-control program will be implemented,
invasive weed species and predatory rats (
controlled, and human disturbance minimized.
Rattus spp.) will be monitored andFencing Specifications
Fence construction will involve driving steel T-posts and treated wood
posts into the ground no more than 10 feet apart along the fence routes using
powered drills and post pounders. One strand of galvanized barbed wire will be
clipped to the posts and nailed to the poles at ground level. Bezinol-coated hog
wire will be stretched and clipped or nailed to the standing posts and poles.
Bezinol steel pins will be used as anchors within each 10-foot span. Where
necessary, the bottom of the fence will be anchored with posts to ensure that the
wire fabric is kept close to the ground. A 24-inch-wide apron of hog wire will
be laid horizontally on the ground and attached to the outside of the standing
fence where needed to curtail pig grubbing and consequent erosion along the
fences.
6
Timing & Costs
Fence construction is planned to occur in two phases because of funding
constraints. Units 1, 2 and 3 will be constructed sequentially during Phase I of
the project, and Unit 4 will be constructed during Phase II. Units 1, 2 and 3
will create three separate fenced exclosures, while Unit 4 is a perimeter fence
that will enclose a larger area that includes Units 1, 2 and 3. (See map in
Appendix A).
The cost estimates for each unit are as follows:
Item Unit 1 Unit 2 Unit 3 Subtotal Unit 4 Total
Linear feet
of Fencing
3,080 1,509 4,307 8,896 9,518 18,414
Supplies/
Fencing
Materials
$6,006 $2,943 $8,399 $17,348 $18,560 $35,908
Fence line
clearing
$8,121 $3,967 $11,412 $23,500 $15,648 $39,148
Fence
Construction
(Labor
Costs)
$15,400 $7,545 $21,535 $44,480 $128,493 $172,973
Helicopter
Sling Loads
$1,440 $1,440 $1,440 $4,320 $4,320 $8,640
Totals $30,967 $15,895 $42,786 $89,648 $167,021 $256,669
Material costs are based on a cost of $1.95 per foot of fence constructed.
Fencing materials for all phases of the project have been purchased and
currently being stored at the Pahole Rare Plant Nursery.
Fence clearing costs are based on a labor cost of $13.50 per hour plus
15% benefits. The amount of time estimated for fence clearing for Units 1, 2
and 3 is based on the amount of time it took to clear a similar amount of fence
line on the original fence constructed in the Pahole Natural Area Reserve in
1995-1996. The clearing cost for each of the 3 units is based on the percentage
of linear feet of fence that contributed to the combined total of the three units.
The amount of time estimated for fence clearing for Unit 4 is based on past
experience and the terrain.
Fence construction costs are based on cost estimates obtained from an
experienced fencing contractor. The cost for fence construction is estimated at
$5.00 per linear foot for Units 1, 2 and 3 and at $12.00 to $15.00 per linear foot
for Unit 4. The estimate for Unit 4 is higher because of the steepness of the
terrain and because the proposed fenceline crosses several gulches. Construction
costs in the table above utilize a cost of $13.50 per linear foot.
The funds for the fence materials were provided to DOFAW in a grant of
$36,000 from the U.S. Fish & Wildlife Service. Fence clearing will be
7
completed by DOFAW personnel with help from cooperating natural resource
organizations such as The Nature Conservancy and the U.S. Army
Environmental staff, or by contract labor supervised by DOFAW staff, or a
combination of the above. Additional funds for fence construction labor will be
provided through an Endangered Species Act Section 6 Candidate Conservation
Grant in the amount of $35,250.
Construction of Units 1, 2 and 3 will proceed as soon as all necessary
approvals have been granted and is estimated to commence in the third quarter
of 2003. Construction of these Units should take approximately one year.
While the materials for the construction of Unit 4 have been purchased,
the State will be seeking additional funds for construction of Unit 4. The timing
of Phase II of this project depends upon the availability of additional funds for
construction.
IV. SUMMARY DESCRIPTION OF AFFECTED ENVIRONMENT
The proposed fencing is located primarily within Pahole Natural Area
Reserve, enclosing a small portion of the Mokuleia Forest Reserve to the east of
Pahole. Pahole Natural Area Reserve is surrounded by the United States Army’s
Makua Military Reservation to the west, the Mokuleia Forest Reserve to the
northeast and southwest, and privately owned pasture to the northeast adjacent
to the lowermost boundary of the Reserve.
Pahole Natural Area Reserve occupies 658 acres on the northeastern face
of the Wai‘anae Mountain Range in the district of Waialua on the island of
O‘ahu. Mokuleia Forest Reserve occupies approximately 3,341 acres, to the
east and west of Pahole Natural Area Reserve. The project area is located
entirely within the Conservation District, within the Protective subzone.
Pahole Natural Area Reserve ranges in elevation from approximately
1,200 to 2,590 feet, and receives an average annual rainfall of 57 to 66 inches.
The runoff is rapid, and erosion occurs on the well-drained soils on slopes along
drainage ways. Eroded spots, stony areas, and outcrops are present in the
Reserve. The lower elevations of the Reserve contain dark friable soils with a
surface layer of silt clay that is moderately to strongly acidic. At the upper
elevations, the well-drained soil is strongly to extremely acidic. The surface
layer of this soil is reddish-brown silt clay overlying ironstone or saprolite.
Environmental conditions for the portion of Mokuleia Forest Reserve within the
project area are similar to those of Pahole Natural Area Reserve.
A privately controlled paved road to the abandoned Nike site and Pahole
Rare Plant Nursery runs close to the north side of the Reserve. A jeep trail
abuts the paved road near Peacock Flat and traverses the Mokuleia Forest
Reserve upslope to the Mokuleia Trail head and Pahole Natural Area Reserve
entrance. The trail continues into Pahole Natural Area Reserve, runs along its
eastern boundary, and continues beyond the Reserve’s northeastern boundary.
The Pahole Natural Area Reserve is accessible to the public by way of an
improved road and the Mokuleia Trail. Activities that are compatible with the
NARS mandate are allowed, including scientific research, hiking on designated
trails, camping, public hunting during designated seasons, and cultural practices
are allowed in the Reserve. Some of these activities require permits. Motorized
vehicles and mountain bikes are not permitted.
Flora
The Pahole Natural Area Reserve protects some of the best examples of
lowland native mesic and dry forest remaining in the Hawaiian Islands. These
forests are noted for their species diversity and richness, and are becoming
increasingly uncommon. Native natural communities within the Reserve include
koa/‘ohi‘a (
(
lowland dry forest, O‘ahu diverse mesic forest, ‘a‘ali‘i lowland dry shrubland,
and an intermittent stream.
The species richness in the project area is found in the sub-canopy trees,
shrubs, and ferns. At least 168 native plant taxa have been reported from the
Reserve, including 58 rare and endangered species. Several of these plants are
locally common in the Pahole Natural Area Reserve, but are not found elsewhere
in Hawai‘i. At least 18 endangered plant species, candidate plant species, and
plant species of concern are present within the project area and are listed in
Appendix C.
A sizeable portion of the Reserve is dominated by non-native vegetation.
The near extirpation of native plants and their replacement by alien species in
these areas are the result of rooting, disturbance of native ground cover, and
weed dispersal by feral pigs.
Acacia/Metrosideros) lowland mesic forest, ‘ohi‘a/uluheMetrosideros/ Dicranopteris) lowland mesic forest, lonomea (Sapindus)Fauna
Native birds known to occur in the Pahole Natural Area Reserve are the
‘apapane (
Pacific golden plover (
(
pairs, has been observed in the project area.
One species of the endangered O‘ahu tree snail (
three snail species of concern, and at least three additional snail species have
been reported from the Reserve. Given the relatively intact condition of the
native forests in the project area, it can be assumed that the site supports native
insects and other invertebrates as well. A list of native animals known from the
Reserve is contained in Appendix D.
9
Non-native feral pigs (
mongooses (
rosea
Himatione sanguinea), ‘amakihi (Hemignathus virens), kolea orPluvialis fulva), and the endangered O‘ahu ‘elepaioChasiempis sandwichensis ibidis). One lone male ‘elepaio, but no nestingAchatinella mustelina),Sus scrofa), rats (Rattus spp.), mice (Mus spp.),Herpestes auropunctatus), and the predatory land snail (Euglandina) occur in the Reserve.Significant and Sensitive Habitats
The entire Pahole Natural Area Reserve is considered to be a sensitive
habitat, particularly for the endangered O‘ahu ‘elepaio (
sandwichensis ibidis)
(
plant species. Pahole Natural Area Reserve has been designated as critical
habitat for the ‘elepaio and for 25 threatened and endangered plants on O‘ahu by
the U.S. Fish and Wildlife Service; a list of species with designated critical
habitat in the project area is contained in Appendix E. The Natural Area
Reserve also includes lowland native mesic and dry forests, which are becoming
increasingly rare in Hawai‘i.
Chasiempis, one species of the endangered O‘ahu tree snailAchatinella mustelina), three snail species of concern, and many rare nativeArchaeological & Cultural Resources
An archaeological reconnaissance of the planned fence route was
performed by Loren Zulick, Cultural Resources Specialist, Environmental
Division, Directorate of Public Works (DPW), U.S. Army Garrison Hawai‘i to
assess the potential impacts to known and previously unrecorded cultural sites.
The full report is included as Appendix F.
The archaeological reconnaissance survey involved walking the entire
planned route for the fenceline. No extant cultural resources on the surface of
the ground, including temporary shelters or other natural or constructed
features, were observed within the project area. In addition, no cultural
resources or historic properties were identified along the proposed fenceline
routes. The closest known cultural site is State Site #50-80-03-5920, a
habitation/agricultural complex located within Makua Valley, 1,000 meters to
the southwest. The report concluded that Site 5920 would not be impacted by
the proposed project.
The report also noted that construction of the proposed exclosures may
impact the Mokuleia Trail, as the fence will cross the trail twice, and suggested
mitigation measures to minimize the potential impact. The report concluded
that no cultural resources will be impacted by the proposed project.
A search for relevant studies at the University of Hawai‘i and in the
Hawaiian and Pacific Collection did not turn up any historical information
regarding the site. A review of
legends, traditions, or other information relating to the project area. Finally,
during pre-consultation, the Office of Hawaiian Affairs, the Ilio‘ulaokalani
Coalition, and Kahea – the Hawaiian Environmental Alliance were requested to
share any information they had regarding traditional use of the area or to
identify any groups or individuals who may use the area. No traditional or
cultural practices occurring in the project area were identified through this
10
process. Collection of plants within a Natural Area Reserve is restricted and
requires a Special Use Permit, and there have been no applications for Special
Use Permits for traditional and cultural activities within Pahole Natural Area
Reserve. Finally, as the project site is in a remote wilderness, visitation to the
area apart from hunters and resource managers is minimal and is primarily
limited to the area surrounding the Mokuleia Trail. Based on all the available
information, there are no known traditional and cultural activities associated
with the project area that might be impacted by fence construction.
Because of the use of Federal funds, the U.S. Fish and Wildlife Service
(as the funding agency) will be conducting a Section 106 consultation for this
project.
Sites of Oahu disclosed no specific sites,V. GENERAL DESCRIPTION OF THE ACTION INCLUDING
ENVIRONMENTAL AND SOCIOECONOMIC CHARACTERISTICS
Environmental Impacts
Short-Term Impacts
The primary short-term environmental impacts of the proposed action are
associated with fence construction. Disturbance of vegetation will occur along
the fence line in a corridor no wider than 10 feet. Some common native plants
may be damaged, but not to any significant degree. Disturbance of the
vegetation will be limited to areas that do not contain sensitive resources.
Soil will be disturbed along the proposed fence line. Soil disturbance will
be short-term, and no changes in the normal runoff or percolation patterns are
expected. The proposed project may enhance water quality in nearby
intermittent streams by reducing feral pig activity.
Noise and air pollution from helicopter sling loads and the use of small
power tools will be unavoidable during fence construction. Increased human
activity in the project area resulting from fence construction will be necessary.
This increase in activity may temporarily disturb native birds in the immediate
vicinity.
Long-Term Impacts
The long-term impacts of the proposed action are associated with the
proposed fencing and removal of feral pigs, which may alter the vegetation in
the project area. Fence construction would entail clearing a corridor no wider
than 10-feet to remove hazards to fence construction crews and facilitate fence
construction. Although most of the vegetation is expected to grow back, fence
inspection and maintenance will require that the fence line be kept cleared of
vegetation. The proposed fence construction may also affect plant species
known to support the endangered O‘ahu tree snail,
11
Soil disturbance along the proposed fence line, as well as the transport of
fence materials and crews, will increase the potential accidental introduction of
non-native plants to the project site. Species, such as
Achatinella mustelina.Triumfetta semitrilobaand
construction workers, and new alien species could be introduced.
Native plant populations, including populations of endangered species,
should increase in numbers once feral pigs are removed from the fenced areas.
At the same time, the removal of feral pigs could result in an increase in nonnative
plants that are currently suppressed by feral pig activity. However, nonnative
plants that are spread by feral pigs in the proposed fenced areas may
decrease once the pigs are removed.
Clidemia hirta, which occur in the project area, could be spread by fenceSocio-Economic Impacts
The proposed action will require spending the funds necessary for the
project. Fencing materials have been purchased, and fence crews and helicopter
operators will be contracted. Positive economic impacts will result from the
release of project funds into the O‘ahu economy through the purchase of fence
materials and employment of fence crews. The proposed action may attract
additional funding for watershed protection, reforestation, and endangered
species recovery.
With respect to long-range planning policies, the project is consistent
with Section 3.1.3, Guidelines for Open Space and the Natural Environment of
the North Shore Sustainable Communities Plan, relating to identification and
protection of endangered species, native ecosystems, and other important
ecologically sensitive areas and with Section 3.4.3, Planning Guidelines for the
Preservation of Forest Lands of the Wai‘anae Sustainable Communities Plan,
relating to the protection of rare and endangered species and preventing the
introduction of alien species.
The proposed action will result in the loss of approximately 250 acres to
public hunting. Under current DOFAW rules, public hunting of game mammals
in Pahole Natural Area Reserve is restricted, requiring an entry permit from the
O‘ahu NARS Manager and requiring hunters to be accompanied by a DOFAW
staff member. The reduction in hunting acreage resulting from the proposed
action is not expected to be significant because little hunting occurs in the
relatively remote, upper elevations of the Pahole Natural Area Reserve.
Further, the project area represents a small portion of the hunting land in the
general area, most of which will remain open for public hunting in the
foreseeable future. Finally, the planned fencing will not restrict access for
hunters crossing Pahole Natural Area Reserve to get to other hunting areas.
A portion of the proposed fence runs along and crosses the Mokuleia
Trail. The trail is maintained and is used by hikers, hunters, and naturalists. In
comparison to other trails on O‘ahu, Mokuleia Trail is not commonly used by
the public because of the limited vehicular access to the trailhead.
12
Fence construction could interfere with public access to portions of the
Reserve for a short period of time. Appropriate public access to, and use of the
area will not be affected in the long-term by the proposed action. After fencing,
the project area will remain open space and will continue to be managed as a
Natural Area Reserve. Public hiking, nature study, research, cultural practices,
hunting, and other permitted activities will still be allowed in the Pahole
Natural Area Reserve, subject to existing NARS rules.
Finally, the positive socio-economic impacts of the proposed action
include protecting native forest and watershed in the Wai‘anae Mountains,
which support the leeward and north shore communities of O‘ahu. The proposed
fences will contribute to the recovery of unique and critically endangered
Hawaiian species and create additional opportunities for nature appreciation,
education, and research.
Cultural Impacts
The proposed action is not expected to adversely affect cultural practices.
As noted earlier, there are no known traditional and cultural activities
associated with the project area that might be impacted by fence construction.
Because public access to the area will not be affected in the long-term by the
proposed action and gates or stiles will be constructed to ensure access where
the fencing crosses Mokuleia Trail, the project should not impact access for
Native Hawaiian cultural practices that may be in existence but are currently
unknown. Construction of fences will have no effect on existing regulations
restricting the collection of plants in Natural Area Reserves, and thus should not
affect Native Hawaiian gathering rights. Finally, as the intent of the fence is to
protect and restore native natural resources, the long-term impact on gathering
rights may be positive.
For example, the proposed action will protect and enhance the habitat for
many native plant species that are essential to the Native Hawaiian culture,
including palapalai (
maile (
(
As these plants and the forest recover, it may be possible to allow limited
collecting of certain species (via special use permits) for traditional practices.
Thus, the proposed action is anticipated to enhance traditional and customary
practices by protecting and actively managing the native forest and watershed in
the Pahole Natural Area Reserve.
Microlepia strigosa), wiliwili (Erythrina sandwicensis),Alyxia oliviformis), ieie (Freycinetia arborea), koa (Acacia koa), ohiaMetrosideros spp.), and papala kepau (Pisonia sp.).VI. MITIGATION MEASURES
Although the proposed action is not expected to have any significant
impacts on the environment, the following measures are proposed to mitigate
any potential negative impacts resulting from the project.
The proposed fence line was selected based on the need to minimize
impacts of fence construction on native plant communities; ease of fence
installation and maintenance; and long-term survival of the fences from
vegetative encroachment, erosion, and slides. The fence line transects
predominantly non-native plant communities, and fence alignment has been
designed to minimize the impacts to native species by following existing
corridors of disturbance whenever possible.
Prior to vegetation clearing and fence construction, DOFAW staff will resurvey
the fence lines to ensure that no rare, threatened or endangered plants or
animals are within the area cleared for the fence. Potentially sensitive areas and
any rare, endangered or threatened plant or animal species identified in
proximity to the project area will be flagged to prevent damage by fence crews.
If necessary, minor changes in fence alignment will be made to avoid sensitive
sites by a greater distance.
Further, in order to avoid impacts to the endangered O‘ahu tree snail,
(
biologists to survey the proposed fence line corridor for tree snail populations
prior to any vegetation clearing. No large ‘ohi‘a trees will be removed, and the
preferred host tree for the endangered snail, olopua (
will receive special attention. Any trimming or cutting of trees or shrubs will
be done only after the vegetation has been carefully inspected for snails. Staff
knowledgeable about tree snail protocols will do the clearing. Whenever
possible, the cleared vegetation will be placed on native vegetation so that any
undetected native tree snails will have an opportunity to reach a replacement
host plant.
Vehicular traffic will be restricted to existing roads and jeep trails, and
existing foot trails will be used during fence construction. All fence
construction workers will be instructed on specific procedures to prevent the
spread or introduction of noxious plants in the project area. Known problem
species, such as
found along the proposed fence lines will be removed from the project area prior
to fence construction. Vehicles and equipment will be inspected prior to
entering the project area.
Upon initial completion of the fences, any feral pigs remaining in the
fenced areas would be penned in temporarily until they are removed. This may
result in intensified damage to native resources by animals that might otherwise
be passing through the area. DOFAW staff will immediately implement
intensive control efforts to eliminate any feral pigs remaining in the enclosed
area. Volunteer hunters from the public will be used as the method-of-choice to
remove feral pigs from the project area before and after fence construction. No
further ingress to, or recruitment of, feral pigs in the project area is anticipated.
Staff will perform periodic monitoring to insure that all pigs are removed and do
not harm native resources within the fenced areas.
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Most of the proposed fencing will be installed along ridges dominated by
non-native vegetation, minimizing the likelihood that any archaeological or
historic sites in the Reserve would be affected. Fencing and removing feral pigs
from the project area will be the first step toward the protection of any
archaeological sites that might be discovered in the future. Feral pigs and other
hoofed mammals are known to disturb archaeological sites elsewhere in Hawai‘i
by knocking over stone walls, turning over soil, spreading noxious weeds, and
accelerating erosion and landslides. Vegetation clearing and fence construction
will cease if any archaeological, historical, or cultural sites are encountered
during construction, and the State Historic Preservation Division will be
consulted immediately.
The proposed action will not restrict travel on the Mokuleia Trail, and the
integrity of the trail will be kept intact. For the most part, the fences will not
be visible from the trail and will not impact any view planes. The fence line has
been routed away from the Mokuleia Trail wherever possible, and will cross the
trail in only two places. Stiles or gates will be installed to facilitate the safe
and easy crossing of the fence in these two areas, and gates may be installed in
other locations for fence maintenance and management purposes. The stiles and
gates should be more than sufficient for any continued use of the project area.
To mitigate the loss of public hunting opportunities in the project area,
efforts will be made by DOFAW staff to provide additional public hunting
opportunities elsewhere in the Mokuleia Forest Reserve by enhancing access to
the lower Kaala and West Makaleha areas, where hunting pressure on feral pigs
is currently low.
Achatinella mustelina), DOFAW staff will enlist the support of expertNestegis sandwicensis),Triumfetta semitriloba and Clidemia hirta, that are currentlyVII. ALTERNATIVES CONSIDERED
Five project alternatives were considered and are described here.
Alternative # 1: Construct a network of habitat management unit fences
surrounded by a perimeter fence in uppermost portion of the Pahole
Reserve as proposed (preferred alternative).
This is the preferred alternative because it is the most efficient way to
protect native resources and watershed, and control feral pigs. In the long-term,
it is more cost-effective to subdivide the 235-acre project site into habitat
management units to facilitate feral pig control and fence maintenance. The
habitat management fences (Units 1, 2 and 3) would secure high-priority natural
areas, and the perimeter fence (Unit 4) would provide adjacent protected areas
for reforestation and future outplanting of endangered species and reforestation.
Public hunting would be used as the method-of-choice for initially removing
feral pigs from the fenced areas. Invasive species would be monitored and
controlled.
Alternative # 2. Construct small fenced exclosures around existing rare
and endangered plant species in Pahole Natural Area Reserve.
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This alternative is impractical because most of the rare and endangered
plants in the Reserve exist on steep slopes, partly as a result of selective
pressure by feral pigs. Fence construction in these relatively remote areas
would be difficult and expensive, and would damage the steep sensitive slopes
targeted for protection. By fencing only existing populations of endangered
species, this alternative would preclude reforestation of the area and the
recovery of endangered species.
Alternative # 3. Construct a perimeter fence around the entire Pahole
Natural Area Reserve to protect approximately 658 acres.
This alternative would require approximately 29,000 feet of fencing and
would be expensive to implement. This alternative would entail fencing
portions of the lower Reserve (below approximately 1,600 feet) that do not
warrant intensive management at this time because of a proliferation of invasive
species and extensive damage caused by feral pigs.
Alternative # 4. No fences constructed in the Pahole Natural Area
Reserve; rely on public, staff, and aerial hunting, snaring, and trapping
to control feral pigs.
Although public hunting occurs in the Pahole Natural Area Reserve,
without easy access to the project area and physical barriers, such as fences, to
restrict the movement of feral pigs, public hunting cannot keep the number of
pigs low enough to protect the Reserve and recover endangered species. Staff
hunting and other methods of controlling feral pigs are more effective in
reducing animal damage than relying on public hunting alone and may be less
expensive than fencing large areas in the short term. However, as long as the
Reserve boundaries are open, there will be ingress of feral pigs from adjacent
lands. Animal control would have to continue indefinitely. Staff and aerial
hunting, snaring, and trapping would be expensive, unpopular, and perceived by
the hunting community as an ongoing waste of meat. The best long-term
solution to the feral pig problem in the Pahole Natural Area Reserve is to fence
large habitat management units and remove feral pigs as quickly as possible.
Alternative # 5. No action.
This alternative is inconsistent with the NARS mandate to protect native
ecosystems and geological sites in perpetuity, pursuant to Chapter 195, HRS.
This alternative is contrary to the State’s legal obligation to protect and recover
threatened and endangered species, as required by Chapter 195D, HRS. The noaction
alternative effectively accepts the deterioration and eventual loss of
unique and rare native forest and watershed, and would preclude endangered
species recovery efforts in the Reserve.
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VIII. DETERMINATION
It is not expected that this project will have a significant negative impact
on the surrounding environment, and thus, it is anticipated that the proposed
action will result in a Finding of No Significant Impact.
IX. FINDINGS, AND REASONS SUPPORTING THE
DETERMINATION
The goal of the proposed action is to benefit native forests, watershed,
and habitat for native species, including endangered species. Creating
permanent barriers to exclude feral pigs will enhance reforestation efforts and
remove a major threat to the continued survival of rare and endangered species.
Conservation efforts throughout Hawai‘i have consistently shown that removing
feral pigs and other invasive species is an important first step toward protecting
and restoring native ecosystems. If animals are removed before the damage is
widespread and severe, native vegetation is often able to recover naturally and
the spread of invasive weeds can be stopped. Unless the pervasive disturbance
of feral pigs is removed, native resources in the Pahole Natural Area Reserve
will continue to decline.
Mitigation measures will be implemented to insure that sensitive natural
resources will not be harmed by the proposed action. Implementing a weedcontrol
program will increase the likelihood of native vegetation recovery and
prevent the establishment of new noxious plants. The short-term damage to
vegetation and soil as a result of building the fences will be more than offset by
the regeneration that will take place once the feral pigs have been removed.
The proposed action will protect watershed and habitat for native species that
are an integral part of the Native Hawaiian culture. Efforts will be taken to
minimize the effects of the proposed action on public use and enjoyment of the
project area.
The anticipated Finding of No Significant Impact is based on the
evaluation of the project in relation to the following criteria identified in the
Hawai‘i Administrative Rules § 11-200-12:
1) Involves an irrevocable commitment to loss or destruction of any natural
or cultural resource.
The proposed action will provide long-term protection for native forest,
watershed, and habitat for native plants and animals, including
endangered species. Fencing and the removal of feral pigs will enhance
reforestation and protect watershed values. The project will secure
outplanting sites for endangered species and aid in their recovery. The
positive results of the project are expected to more than offset any shortterm
damage incurred during fence construction.
2) Curtails the range of beneficial uses of the environment.
Amelia,
There is more to this so called Anglo Fence for security reasons, no less. I doubt if this fence was for the environment. Dr. George Kanahele writes in his Ku Kanaka text on the Sense of Place and actually makes a difference between the two cultures. Anglo Geography and fence and the Native Hawaiians and their version of space.
We needed to call the Anglos on their intent and didn't....
The fence was a well talked about point of contention during botany classes and off classes. I did do a walk to the end of Kaena with my Botany class 400 level when the Albratros flew in to nest. So clearly it's an old long time ago plan that leaked into the sustainable plans in Waianae.
The sustainable planners out here mostly insecure humans and need domestication that are planning the fence line along the Waianae Coast---nuts yeah!