HomeMy WebLinkAboutHabitat Management Plan 701152005
Harlan Bauman
Buffer Reduction
And
Revegetation Plan
Parcel # 701 025 005
April 2004
Contents
Introduction
Description of Site
Applied Methodology
Washington State Wetland Identification and Delineation Manual
Streams and Streamside Wetland Definitions
Jefferson County Unified Development Code
Wetland Buffer Definition
Standard Buffer Requirements
Reducing Buffer Widths
Findings
Buffer Reduction
Revegetation Plan
Buffer Protection
Stormwater Control
Summary
References
Appendix
Sheet # 1
Sheet #2
Sheet # 3
Location Map
Existing Conditions
Buffer Revegetation Plan
Table # 1 Plant List and Landscape Specifications
Table #2 Re-seeding Recommendations and Quantities
Installation Specifications and Recommendations
Harlan Bauman
Buffer Reduction
And
Revegetation Plan
Parcel # 701 025 005
April 2004
MLA#A04-00099
Introduction
The Department of Community Development is reviewing the proposed 24' X 24' garage by Harlan
Bauman for Jeannie R. Klingensmith. Olympic Wetland Resources, Inc. was contacted to review the site
since a portion of the structure falls within a 100-foot buffer assigned to a Type 3 Stream.
A site assessment was conducted on March 22, 2004. The purpose of the assessment was to locate the
mapped stream, assess construction impacts, and evaluate possible buffer reduction possibilities.
All streams within Jefferson County are subject to requirements outlined in the Jefferson County Unified
Development Code (UDe) dated January 1,2001. Land use restrictions will apply to all future
developments associated with this parcel.
Description of Site
. Legal Description: Parcel # 701 025 005
. Location: 93 Lone Star Road, off Dabob Road (Appendix Sheet #1: Location Map)
. Soils: AmD Alderwood gravelly loam (Appendix Sheet #1: Soil map)
. Slopes: 150/0 to 30% slopes (60% slopes along ravine)
A new home has been installed at 93 Lone Star Road. To accommodate an attached garage additional
land has been cleared of all vegetation to within 10 feet of the edge a steep ravine. A documented Type 3
Stream, located at the bottom of the ravine has an assigned 100-foot buffer. This impacted area lies
within that buffer and measures approximately 35 X 85 feet, (2,800 square feet).
During the March assessment water was present in the stream at depths of 3 to 5 inches. The stream has
associated wetlands that are confined to within the 9 to 12 feet wide stream bank. The side slopes of the
ravine are very steep (30 degree, 60% slope) yet are densely vegetated with native trees, shrubs, and
ground cover and no erosion was observed.
Applied Methodology
The following resources were consulted for this project:
. Jefferson County Critical Areas Map (Stream and Wetlands)
. Aerial Photographs
. Jefferson County Unified Development Code (January 1, 2001)
. Soil Survey of Jefferson County (U.S. Soil Conservation Service 1975)
Bauman Stream Buffer Reduction Plan
Report File Number 2004-4523
1
Olympic Wetland Resources, Inc. 4/04
. National Wetland Inventory Map
. Washington State Wetland Identification and Delineation Manual
. National List of Plant Species That Occur in Wetlands: Northwest (Region 9)
Washington State Wetland Identification and Delineation Manual
Fieldwork to determine the presence of wetland boundaries was conducted according to the methodology
outlined in the Washington State Wetland Identification and Delineation Manual (Department of Ecology
#96-94). Chapter 173-22 of the Washington Administrative Code requires that all wetlands within the State
of Washington be delineated using this manual.
The methodology outlined in the Washington State Wetland Identification and Delineation Manual requires
examination of the three parameters for a positive wetland determination: hydric soils, hydrophytic
vegetation, and hydrology. For an area to qualify as a jurisdictional wetland it must have a positive indicator
from all three parameters. All wetlands identified using this methodology may be federally regulated,
regardless of size.
Streams and Streamside Wetland Definitions
According to the DOE Washington State Wetland Rating System, Western Washington (Second Edition
DOE Manual), a stream channel is defined as "a seasonal flow of water that is predominately in one
direction and there is a defined bank or series of banks containing the water." Oftentimes, stream and
streamside wetlands are intermingled. If a stream has wetland characteristics, no matter how small, then
the entire system is rated as a wetland. Both streams and wetlands have associated buffers as defined by
the Jefferson County Critical Areas Ordinance. The larger buffer is the one that is applied.
Streams types in Jefferson County are determined using the criteria set forth in the Chapter 222-16-030_
WAC. This system categorizes streams according to connectivity of larger bodies of water, fish bearing
potential, use by humans, and whether the stream flow is seasonal or perennial. The ratings range from
Type 1, the highest quality, to Type 5, a seasonal non fish-bearing stream. This stream has been rated as a
Type 3 Stream.
Jefferson County Unified Development Code (January 2001)
Wetland Buffer Definition Section 3.6.9 (2):
A designated area adjacent to a wetland that protects, and is integral to the wetland
ecosystem. Buffers provide shading, input of organic debris, and coarse sediment, room
for variation in the stream or wetland boundaries, habitat to wildlife, and protection from
harmful intrusion necessary to protect the public from losses suffered when the functions
and values of aquatic resources are degraded.
Standard Buffer Requirements 3.6.9 (5 iii):
Buffers shall remain naturally vegetated except where the vegetation has been disturbed,
invaded by highly undesirable species, or would substantially benefit from the increased
diversity of introduced (native) species. Where buffer disturbance has occurred during
construction, replanting with native vegetation shall be required. Minor pruning of
Bauman Stream Buffer Reduction Plan
Report File Number 2004-4523
2
Olympic Wetland Resources, Inc. 4/04
vegetation to enhance views and removal of undesirable species (e.g. alders) may be
permitted by the Director on a case-by-case basis.
Reducing Buffer Widths 3.6.9 (6):
The Administrator may reduce the standard wetland buffer width, when the project applicant
demonstrates both of the following to the satisfaction of the Administrator:
i. Standard wetland buffer width averaging as set forth in this section is unfeasible.
ii. The project application includes a buffer enhancement plan using native vegetation,
which substantiates that an enhanced buffer will improve the functional attributes of
the buffer to provide additional protection for the functions and values.
Findings
The Type 3 Stream is inaccurately mapped (by the Jefferson County Critical Areas Map) and actually is
located farther to the west of the site. This stream contains wetlands directly adjacent to the stream
channel, which is 9 to 12 feet wide and at the bottom of the ravine. The steep side slopes (60% slopes) of
the ravine are densely vegetated and do not appear to be at risk of erosion from the construction project
since no vegetation was not removed within 10 feet of the top of the ravine. The buffers were measured
perpendicular from the edge of the stream channel (Jefferson County Unified Development Code, Jan. 1,
2001, Section 3 Standard Streamside Buffers Table 3-2).
The northern edge of the proposed 24' X 24' garage will fall within the 1 00- foot buffer. The distance to
the proposed building site from the edge of the stream bank is approximately 90 feet. Approximately
2,800 square feet of land has been cleared within 100-foot buffer that should have been left in its natural
state. The findings map show existing conditions, stream location (compared to location mapped by
Jefferson County), impacted area, and proposed garage location (Appendix Sheet #2).
Below is a partial list of vegetation identified on the site.
Wetland Plants
Scientific Name Common Name Status La er
Inus rubra Alder FAC Tree
thyrium filix-femina Lady fern FAC Herb
Deer fern FAC+ Fern
Skunk cabba e OBL Herb
Salmonbe FAC+ Shrub
Western red cedar FAC Tree
Piggy-back plant FAC Herb
FACU Tree
FACU Shrub
FACU Herb
FACU Tree
Bauman Stream Buffer Reduction Plan 3 Olympic Wetland Resources, Inc. 4/04
Report File Number 2004-4523
Sambucus racemosa Elderberry FACU Shrub
Tsuga heterophylla Hemlock FACU- Tree
Vaccinium ovatum Evergreen huckleberry NI Shrub
Vaccinium parvifolium Red huckleberry FACU Shrub
UPL Upland Species, FACU Facultative Upland Species/Non Wetland, FAC Facultative Species,
FACW Facultative Wetland Species, OBL Obligate Wetland Species, NI No Indicator Assigned
The qualifier of + or - further defines the status of the species.
Plants classified according to the Fish and Wildlife Service; 1988,1993 Update
Buffer Reduction
In order to accommodate a feasible site for the garage, this project will require the reduction of the
standard 100- foot buffer. The Department of Community Development can authorize a buffer reduction
(see 3.6.9 (6) above) on a case-by-case basis. The garage will be approximately 90 feet from the Type 3
Stream bank.
The building area is not at risk from flooding due to the depth of the ravine; there is an elevation gain of
approximately 30-feet from the stream to the proposed garage site. Likewise there should be no impacts
to the stream from the building project due to the density of vegetation between the stream (within the
ravine) and the building site. Reducing stream buffers should have no additional impact to any part of this
riparian corridor.
Due to the impacts of clearing within the 100-foot buffer a revegetation plan will be required as
part of a buffer reduction.
Revegetation Plan
The primary goal of this revegetation plan is to minimize further buffer impacts by planting appropriate
native trees and shrubs. Trees and shrubs that are currently found on site should be protected during the
construction and revegetation process. Secondary goals include increasing species diversity, thereby
increasing habitat value for wildlife.
The impacted buffer is an area, approximately 85 feet by 35 feet that lies within a flat area at the top of the
ravine. After the garage is built the remaining buffer (to the north and west side of the garage) will be
planted in native trees and shrubs. The planting plan includes vine maple, shore pine, cedar, hazelnut,
red-flowering currant, Oregon grape, and Indian plum (Appendix Sheet #3). Complete landscape
specifications are listed including quantities, sizes, optimum locations, and spacing for each plant and all
remaining bare areas should be re-seeded with the seed mix included in the (Appendix Table #1 and Table
#2). Plantings can be rearranged to suit landscape and aesthetic choices.
Also includes in the Appendix is a directory of local nurseries that supply native plants and Installation
Specifications and Recommendations. It is critical for the success of any newly planted trees and shrubs
to be maintained for the first two to three years. Maintenance includes watering and weeding and
replacement of plant material that does not survive after the initial planting.
Bauman Stream Buffer Reduction Plan
Report File Number 2004-4523
4
Olympic Wetland Resources, Inc. 4/04
Buffer Protection
No additional vegetation within the buffer between the garage and the stream will be removed; the
preservation of all existing large trees and shrubs in the buffer is critical. Invasive species such as
Himalayan blackberry, ivy, or Scot's broom will be controlled and removed from the newly planted
buffer.
Stormwater Control
All storm water from the house and garage will be directed away from the ravine and stream. Sediment or
runoff during the construction of the structure should be minimized with the use of straw bales or
sediment fences. This will be required during the entire building process and will continue to be required
until the vegetation becomes established and can act as a natural filter. A gravel base will be placed on
driveways and parking areas.
To verify compliance with this planting plan, the project will be approved during the final inspection.
Summary
A Buffer Reduction and Revegetation Plan are outlined in this report and have been prepared to meet the
requirements of the setback approval outlined by the Jefferson County Community Development
Department. A field assessment has shown that the proposed garage encroaches on a 100-foot buffer
associated with a Type 3 Stream. The stream is located in a densely vegetated steep ravine with 30 degree
(60%) slopes with an elevation drop of approximately 30 feet from the flat building site for the garage.
The actual location of the structure will be 36 feet back from the top of the ravine and 90 feet from the
edge of the streambed.
Buffers will need to be reduced from the assigned 100 feet to 90 feet to accommodate the construction of
the 24 X 24 foot garage. This buffer reduction is reasonable and falls within the reductions permitted by
the Department. However, a larger area of the buffer has been impacted during the initial clearing for the
home site and a revegetation plan is required to mitigate this degradation. No further impacts will result if
the post-construction revegetation plan is completed, if best management practices are used during
construction, and if stormwater from impervious surfaces is directed away from the steep slopes of the
ravine. The primary goal of this plan is to increase overall functions and values of the buffer and to
further protect the Type 3 Stream. Compliance with the plan will be verified through inspections during
and after construction. The success of this project will be dependent on ongoing maintenance.
Final approval of this buffer reduction and revegetation plan falls under the jurisdiction of Jefferson
County DePar1:n:ent of Community Development, Critical Areas Division.
i --"
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Dixie Llewellin
Principal Biologist, Olympic Wetland Resources, Inc.
Certified for Wetland Delineation, 1987 Manual.
Wetland Training Institute, June 1995.
Bauman Stream Buffer Reduction Plan
Report File Number 2004-4523
5
Olympic Wetland Resources, Inc. 4/04
References
Buckingham, et at, 1995. Flora of the Olympic Peninsula. Northwest Interpretive Association
and the Washington Native Plant Society, Seattle, Wash.
Cooke, Sarah Spear, 1997. A Field Guide to the Common Wetland Plants of West em
Washington and Northwest Oregon. Seattle Audubon Society, Seattle, Wash.
Cowardin, L.M.V. Carter, F.C.Goblet, and E.T. LaRoe, 1979. Classification of Wetland and
Deep Water Habitats of the U.S. U. S. Fish and Wildlife Service, Washington, D.C.
Hitchcock and Conquest, 1973. Flora of the Pacific Northwest.
Federal Interagency Committee for Wetland Delineation, 1987. Federal Manual for Identifying
and Delineating Jurisdictional Wetlands. July 1994 update. u.s. Army Corps of
Engineers, U.S. Environmental Protection Agency, U.S. Fish and Wildlife Service, and
U.S.D.A. Soil Conservation Service.
Jefferson County Unified Development Code. January 2001.
Leonard, William P., 1993. Amphibians of Washington and Oregon. Seattle Audubon Series.
MacBeth, Div. of Kollmorgen Instruments Corp., 1992. Munsell Soil Color Charts.
Mitsch and Gosselink, 1993. Wetlands.
Pojar, Mackinnon, 1994. Plants of the Pacific Northwest Coast.
Reed, Porter, 1988. National List of Plant Species That Occur in Wetlands, Region 9. 1993
update.
Washington State Wetland Department of Ecology, March 1997. Washington State Wetland
Identification and Delineation Manual, #96-94.
u.s. Department of Agriculture, 1994. Keys to Soil Taxonomy. Pocahontas Press.
u.s. Department of Agriculture, Soil Conservation Service, 1975. Soil Survey of Jefferson
County.
Appendix
Sheet # 1 Location Map
Sheet #2 Existing Conditions
Sheet # 3 Buffer Revegetation Plan
Table 1 Plant List and Landscape Specifications
Table #2 Re-seeding Recommendations and Quantities
Installation Specifications and Recommendations
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Installation Specifications and Recommendations
All areas of exposed soil will be revegetated with species known to tolerate local soils
and conditions. Individual plant species have been selected because they have a high
habitat value, are consistent with surrounding vegetation, and are known to thrive in east
Jefferson County.
Fall Installation
Planting should be installed between mid-September and mid-November, unless the new
plantings can be watered throughout the summer. Plantings installed in the fall generally
outperform those installed in the late winter or spring. Plants put in the ground in the fall
have the advantage of an extended period for root growth before rapid top growth in the
spring. In the fall, the soil is warmer and more aerated than in the spring and most plants
experience active root growth during this time.
The cool, cloudy days and frequent precipitation of fall and winter also provide ideal
transplanting conditions. Until sufficient root systems develop, newly installed plants will
undergo transplanting stress that can be exacerbated by hot sunny days. Fall and winter
weather allows for reduced transpiration and provides ample moisture for the roots while
the plant recovers from transplant shock.
Root Disturbance
Immediately before installation plants with broken, damaged, or twisted roots
must be pruned. Matted or circling roots of containerized plantings must be
pruned or straightened and the sides of the root ball must be roughened from top
to bottom to a depth of approximately half an inch in two to four places.
If circling roots are left, they may eventually girdle the plant as they grow and
thicken in place. If the roots at the edge of the root ball are straightened and
extended, they will have access to a greater volume of soil in the planting hole.
Also, the roughened edges of the root ball will have better contact with the
backfill soiL
Disturbing and removing one-fourth to one-half of the roots in the outer inch of
the root ball will damage only the most sensitive plants; most often, this treatment
actually stimulates increased plant growth.
Plant Depth
The finished height of each plant's root ball will be slightly higher than that of the
surrounding soil. The exception is for sandy soils, in which case the soil heights
will be even. The top of the root ball will not be covered with backfill soil. A
watering basin will be formed around each planting by building a berm of soil at
least 30 inches in diameter.
When planting a container-grown plant, the top of the root ball should not be
covered with any other soil. Covering the root ball with soil, particularly if it has a
finer texture than the potting or field-growing soil, will generally cause water to
flow around the root ball instead of into it; root balls covered in this way may
receive water only from below. To allow direct wetting of the root ball from
above, install the plant so that the top of the nursery soil is slightly higher than the
surrounding soil level. If the soil is sandy, or of a large particle size, then the
nursery soil should be level with the surrounding soil.
A watering basin made of mounded soil around each planting will further help to
catch water from above-the berm should be at least 30 inches in diameter
surrounding a plant. Mulch placed within the basin and on the berm will limit
moisture loss from the root ball and surrounding soil, but take care that it does not
come into contact with the stem of the plant as rodents or pathogens living in the
mulch may attack the bark.
Re-seeding
After the completion of the construction and planting projects, a seed mix (included in
Table 1.) will be evenly spread on all bare areas. An inspection by a wetland biologist or
Critical Areas staff of Jefferson County Department of Community Development will be
required after all planting is completed.
Maintenance: Weeding and Irrigation
The use of appropriate native species and careful planting ensures that the need for
ongoing maintenance will be minimized. However, some maintenance is required to
ensure that the young plants become established. It is recommended that weeding around
new plants be conducted once or twice a year during the months of May and September
for the first five years, and as often as needed after that. All Scot's broom, Himalayan
blackberry, and thistle should be monitored and eliminated from the site.
Irrigation may be required for upland species (vine maple, red-flowering currant, and
pine) for the first three years or until plants are well established. Hand watering or
irrigating with overhead sprinklers once a week should be adequate during the hot
summer months. Wetland species that are planted near the creek corridor may require
less watering.
2
Oly/mp( .Jic We"tland Re:S,OiUf'CeS lniC:
__ .. / ' _. _, , _' u . __. _., dd . d'" .' ., _ I .0 " .'" .. _ J u ~ , , ,',.,.:. _ I .,
Dixie Llewellin, Principal Biologist
Parcel # 701 025 005
Stacie,
I have reviewed the comments by Jeff Davis, Washington Department ofFish and Wildlife and have
made revisions to the revegetation plan for Harlan Bauman. The plan now contains 6 Douglas fir for
future LWD (large woody debris) to be planted on the upper areas of the buffer. The firs will be
replacing the 6 shore pines from the original plan.
If you need any additional changes please feel free to contact me.
Sincerely, /};
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r
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Dixie Llewellin, Principal Biologist
Certified for Wetland Delineation, 1987 Manual
Wetland Training Institute, June 1995.
, Cc; Jeff Davis, Harlan Bauman
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