HomeMy WebLinkAboutWetland and Buffer As-Built Report - SEP Determinations - 6/5/1998 WETLAND and BUFFER MITIGATION
MONITORING PROGRAM
AS-BUILT REPORT
SETTLE INN RV PARK
Parcel #42024-43-00100
SE quarter SW quarter SE quarter of
Section 24, Township 20N, Range 4W
This report has been prepared to meet the requirements of
Mason County's Interim Resource Ordinance(#77-93)
by
Bra J. Murphy
of
MOSS & MURPHY ENVIRONMENTAL
P.O. Box 1058 Gig Harbor, Washington 98335 (253) 858-5340
ME#8271
June 5, 1998
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CONTACT:
Mery Settle
1401 Deegan Road E.
Shelton, WA 98584
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TABLE OF CONTENTS
Page
1.0. Introduction 1
1.1 Introduction 1
1.2 Mitigation Goals 1
2.0 Site Description 1
3.0 Installation Sequence 2
4.0 Monitoring Methods 2
5.0 As-Built Conditions 3
5.1 Buffer Mitigation Area 3
5.2 Wetland Area 3
5.3 Invasive Exotics 3
5.4 Potential Problems 4
6.0 Assessment of Success 4
References
Figure 1: As-Built Site Plan
Table 1: Plant Materials Installed
Appendix A: Photo Documentation
Appendix B: Monitoring Data
1. INTRODUCTION and MITIGATION GOALS
1.1 Introduction
The original wetland report for the Settle RV Park was completed by Moss
Environmental in April, 1997. It was verified that Mason County issued a stop
work order on March 13, 1996 for violations of filling and alterations to the on site
wetlands. The following As-built report covers mitigation that will offset
development impacts to approximately 4,000 square feet of the on site Wetland.
1.2 Mitigation Goals
Theoverall f restoration i r n ove al oal o thisproject s to provide functionally restored
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wetlands to compensate for recent impacts to these areas. The restoration plan
includes removal of fill that was placed in these areas and the planting of native
trees and shrubs in order to reestablish the wetland vegetation community. The
specific goals and performance standards are detailed in Table 1.
Table 1: Goals and Performance Standards
Overall Goal: to restore approximately 2,000 square feet of wetland perimeter along the eastern edge of the
existing wetland,and to restore approximately 2,000 square feet of seep wetlands along the southern portion of the
wetland. The desired restored vegetation community is a facultative/forested wetland.
GOAL PERFORMANCE STANDARD
1. At least 4,000 square feet of wetlands will be Hydric soils,hydrophytic vegetation,and wetland
restored on this site. hydrology will be present throughout the designated
restoration areas.
2. To restore a multi-layered forested wetland with At least one species of native evergreen trees and three
native plant species similar to those present prior to the species of native shrubs will be established in the
disturbance. restored wetland.
3. To restore water quality remediation within the Native herb vegetation should attain at least 80%cover.
wetland area. Native shrub vegetation should attain at least 45%
cover.
Native trees should attain at least 45%cover.
Soils should be saturated within the restored wetlands
for at least two weeks with the rate of flow slow enough
to prevent erosion and provide opportunity for nutrient
uptake.
4. To avoid invasion of non-native species into the Less than 10%of the mitigation area should be covered
restored wetland. with undesirable invasive or weedy species.
Invasive species that are potential problems on this site
include reed canarygrass(Phalaris arundinacae).
Weeds on the 1994 Washington State Noxious Weed
List should be removed from the mitigation area.
2. SITE DESCRIPTION
The project site is located in the south half of the southeast quarter of the southwest
quarter of the southeast quarter of Section 24, Township 20N, Range 4W of the
Willamette Meridian in Mason County, parcel #42024-43-00100. The site consists of
approximately 10 acres in total. The northern four acres have historically been used for
receipt of landfill material; the southern half of the site is lower and contains several
springs and an existing wetland system that drains toward the west flowing off-site and
entering into a seasonal creek that flows north along the west boundary in the easement
for Highway 101.
A brief historyof the site is contained in the April 23 1997 wetland restoration report.
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3. INSTALLATION SEQUENCE
It was anticipated that the mitigation project was to be installed in May or June of
1997. Actual planting occurred mainly in the early fall of 1997 with additional
plantings in the early spring of 1998. Ideally, plants should be installed in the
early fall or early spring in order to give them an opportunity to establish root
systems prior to the summer dry season. However, it is important that the
restoration occur as soon as possible.
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Oct. 1, 1997 Stake restoration area. Install silt fencing around perimeter of
existing wetland to be undisturbed as shown on the grading
plan.
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Oct. 2-5, 1997 Grading plan as indicated on Attachment 2, will be
completed. The grades will be overexcavated by 12 inches to
allow for the placement of purchased topsoil.
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Oct. 6-8, 1997 Purchased topsoil will be placed to a depth of at least 12
inches throughout the restored wetland areas.
Oct. 9-10, 1997 Native plant materials will be installed according to the
planting plan as shown on Attachment 3.
June 30, 1998 Silt fencing will be removed from the perimeter of the
existing wetland.
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4. MONITORING METHODS
Moss Environmental provided on-going consultation and site visits as necessary during
the installation process. Minor alterations were made to the planting plan due to plant
availability.
This as-built assessment documents existing conditions, including the changes noted
above and volunteer plant materials and invasive exotic plant species that are present on
the site.
Two 50-foot permanent monitoring stations were established; one along the wetland
restoration area and one along the seep wetland restoration area of the mitigation
project.(Figure 1).
Plantings within each monitoring plot were counted, percent cover, native volunteer
species were recorded. In addition, soil stability characteristics and hydrology were
recorded.
5. AS-BUILT CONDITIONS
The following variations were made to the original plan:
• A few changes were made due to plant availability in the wetland area. Additional
plantings of Douglas fir, Western Hemlock and red Alder were planted in the
restoration areas.
5.1 Buffer Mitigation Area
Tree and shrub plantings were installed per the planting plan in the wetland
restoration area, although some changes were made due to plant availability..
Medium-sized bark mulch was placed around the plantings in the buffer mitigation
area (see Attachment 1).
5.2 Wetland Area
The restored wetland areas appear to be successfully planted with plants that are shown
in Table 1. Some additional plantings were planted that were not called for in the initial
Restoration report. Some plants may need irrigation during the dry summer months. The
seep area is revegetating well with a grass and clover mix in the herbaceous layer. Plants
of both wetland areas are shown as a total number used in Table 1. Some of the
additional plantings may not do well where they were planted.(i.e. skunk cabbage which
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was planted may be topographically too high in one or two plants. This was noted and
not changed as they were additional plantings and are not required in the plan).
5.3 Invasive Exotics
At the time of the site visit in October, 1997, and in late April, 1998, there were no
invasive exotics in the mitigation area, although Scot's broom (Cytisus scoparius)
can be found north and west of the migitation area. This, of course, will be
continued to be monitored in future monitoring visits.
5.4 Potential Problems
At this time, the mitigation effort appears to be successful. Potential problems
include invasion by invasive exotics, including Himalayan blackberry (Rubus
discolor) and possibly Scot's broom. Additional potential problems could come
from erosion associated with the wetland buffer and their slopes(seep area). At
the time of the site visit, however, there appeared to be no serious erosion
problems throughout the buffer area.
6. ASSESSMENT OF SUCCESS
The Settle RV Park wetland restoration and buffer mitigation project has been
successfully installed. Plant materials appear to be in good health and thriving in the
buffer and wetland areas. A total of four tree species, four shrub species, and 3-6 herb
species were installed in the wetland and buffer areas. There are no invasive exotics in
the mitigation area at this time, however, this will have to be watched in the future.
Irrigation will most likely be required during the summer months.
TABLE 1: AS-BUILT PLANTS INSTALLED
SPECIES COMMON NAME IND STAT ORIGINAL NUMBER REASON
SPECS INSTALLED FOR CHANGE
Trees
Thuja plicata Western red cedar FAC 40 30
Alnus rubra Red alder FAC 0 20 additional plantings
Pseudotsuga menzesii Douglas fir FACU 0 35 additional plantings
Tsuga heterophylla Western hemlock FACU 0 1O additional plantings
Shrubs
Cornus stolonifera Red osier dogwood FACW 84 35
Rubus spectabilis Salmonberry FAC 84 20
Ribes sanguineum Red flowering currant NR 84 60
Salix sps. willow FACW 0 35
Herbs
Juncus ensifolius Three-stamen rush FACW 0 165
Ranunculus repens Creeping buttercup FACW 0 100
Tolmiea menzesii Piggy back plant FAC+ 0 >10
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REFERENCES CITED
Moss Environmental, 1996. Wetland Buffer and Restoration Plan, for the Gibbens Single
Family Residence.
Moss Environmental, 1996. Wetland Delineation and Analysis Report for the Gibbens
Single Family Residence.
Shannon Wilson, Inc., 1996. Wetland Mitigation Report for Graham Town Center.
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GARY YANDO,DIRECTOR
P�oN.STgTFO
o A o DEPARTMENT OF COMMUNITY DEVE T
u _
o T i PLANNING - SOLID WASTE- UTILITI
Zoo N Y oy BLDG. I • 411 N. 5T'j ST. • P.O. BOX 57 �
SHELTON, WA 98584 • (360) 427-967
rasa .
August 17, 1998
Mery Settle
1401 E Deegan RD
Shelton, WA 98584
RE: Wetland and Buffer Mitigation Monitoring Program asaregquf bt_.
Mason County for previous violation which occurred in the site.
Parcel #42024-43-00100
Dear Mr. Settle:
The Mason County Department of Community Development has reviewed
the Wetland and Buffer Mitigation Monitoring Program As-Built
Report that was prepared to meet the requirements of the Mason
County Interim Resource Ordinance (#77-93) by Moss & Murphy
Environmental dated 6/5/98 .
The report meets the requirements for restoration and monitoring of
the wetland which was filled and degraded in the later part of 1996
and early 1997 . Mason County DCD staff met with you on the site
this spring and summer and verified the removal of the fill and
establishment of the new plantings for the restoration project.
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At this time, the violation has been resolved to the point where
applications for further development may be submitted to the County
for review. Staff recommends that you and/or your representative
contact Michael MacSems of the Permit Assistance Center to schedule
a pre-application meeting once a complete proposal has been
developed meeting the current ordinance requirements.
If a complete application with site plan is received prior to the
pre-application meeting staff will be better able to assist you
with their department 's requirements for development. If you have
j any questions please give me a call . Thank you.
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Sincerely,
Grace Miller, Planner
DEPT. OF COMMUNITY DEVELOPMENT
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CC: Gary Yando, Director DCD