HomeMy WebLinkAboutNapoli Permit SubmittalRpt.pdf LAKE STUDY
AND
SHORELINE MITIGATION PLAN
FOR
Napoli SFR Permit Submittal
3111 Mountain View Ave N
City of Renton, WA
Wetland Resources, Inc. Project #18022
Prepared By
Wetland Resources, Inc.
9505 19th Avenue SE, Suite 106
Everett, WA 98208
(425) 337-3174
Prepared For
Giovanni Napoli
1205 N 27th Place
Renton, WA 98056
June 8, 2018
Lake Study and Shoreline Mitigation Plan WRI Project #18022
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Table of Contents
Proposed Project ........................................................................................................................1 1.0
Project Location .................................................................................................................... 1 1.1
Landscape Setting ................................................................................................................. 1 1.2
Site Description ..................................................................................................................... 2 1.3
Project Description ............................................................................................................... 3 1.4
Lake Study .................................................................................................................................3 2.0
Assessment Methodology ...................................................................................................... 3 2.1
Shoreline Mitigation Plan (Lake Study, Supplemental) .............................................................5 3.0
Alternatives Analysis ............................................................................................................. 6 3.1
Impact Evaluation ................................................................................................................. 6 3.2
Proposed Mitigation .............................................................................................................. 7 3.3
Use Of This Report .................................................................................................................10 4.0
References ................................................................................................................................11 5.0
Appendices
Appendix A: Lake Study Map
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PROPOSED PROJECT 1.0
PROJECT LOCATION 1.1
The project occurs on King County Tax Parcel 3342103860. This is a .55-acre parcel, located at
3111 Mountain View Ave N in the City of Renton. Access to the property is from the east via
Mountain View Ave N. The Public Land Survey System Locator is Section 21, Township 24N,
Range 3E, WM.
Figure 1: Site-Scale Vicinity Map
LANDSCAPE SETTING 1.2
Basin: Puget Sound
Sub-Basin: Water Resource Inventory Area (WRIA) 8 – Cedar River/Renton River
Watershed: Lake Washington Watershed
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Figure 2: Landscape-Scale Vicinity Map
The study area is located on the east shore of Lake Washington, the second largest natural lake in
Washington State with a total surface area of over 22,000 acres. The lake is approximately 20
miles in total length, with an average width of 1.5 miles (Kerwin, 2001). Lake Washington is
highly developed along much of the approximately 50 miles of lake shoreline.
The subject property is located just north of the western tip of Coleman Point. The surrounding
area is developed with single-family residences along the shoreline and the west aspect slope of
Kennydale above Lake Washington.
SITE DESCRIPTION 1.3
The subject property is immediately surrounded to the north and south by residential
development to the east by Mountain View Ave N and to the west by Lake Washington. An
existing house and significant concrete parking pad are located on the subject property. Between
the principal structure and the shoreline, maintained lawn is the dominant vegetation type.
Development along the lake’s shoreline is limited to the existing bulkhead, dock, boathouse, and
dilapidated boat ramp. The face of the bulkhead defines the ordinary high water mark (OHWM)
of Lake Washington. No vegetation is present waterward of the OHWM. No aquatic vegetation
or lake-fringe wetlands were observed. Beach substrate consists of sorted large cobble on a fairly
steep grade, which is consistent with a high-energy shoreline. No other habitat features were
observed on or in the vicinity of the subject property.
Mercer Island
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Figure 3: Bing Maps Bird’s Eye View looking east
PROJECT DESCRIPTION 1.4
The applicant proposes to remove the existing house and associated impervious surfaces and
construct a new single-family residence. The new house will be slightly closer to the lake than the
existing house, but the overall impervious surfaces will be reduced. The dock will also be
replaced is roughly its existing footprint.
The City of Renton’s Shoreline Master Program (SMP) requires applicant proposing shoreline
modifications on existing legal lots to provide a Stream or Lake Study that meets the
requirements of RMC 4-8-120D.19 and provides a specific Shoreline Mitigation Plan to allow
for a 65- foot vegetated buffer.
LAKE STUDY 2.0
ASSESSMENT METHODOLOGY 2.1
Field Investigation
Principal Ecologist Scott Brainard, PWS, conducted a site investigation on May 16, 2018.
SITE
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Limit of Study
The proposed project occurs on tax parcel (tax ID number 3342103860). Lack of legal access to
adjacent parcels prevents Wetland Resources, Inc. (WRI) staff from performing detailed
investigation in surrounding areas. Therefore this investigation involved a site visit to the subject
property and evaluation of existing on-line information, include the USFWS National Wetlands
Inventory (NWI), USDA/NRCS Web Soil Survey, WDFW SalmonScape Interactive Map,
WDFW Priority Habitat and Species (PHS) Interactive Map, and King County iMap.
Lake Assessment Narrative
Lake Washington, a Type S water, is the only aquatic critical area located on and near the
subject property. On-site vegetation is virtually entirely maintained lawn with the exception of
ornamental trees and shrubs immediately adjacent to the house. The on-site land use and
vegetation composition is consistent with the surrounding uses within 100 feet along the
shoreline.
Ecological Functions
The cement bulkhead deflects wave energy, which can cause erosion that leads to deeper water
along the shoreline. High-energy/deep water shorelines do not provide refuge opportunities for
migrating fish. Bulkheads also prevent establishment of riparian vegetation, which provides cover
and forage opportunities for juvenile salmon. The narrow natural beach provides some shallow,
low-energy habitat, but the general absence of overhanging vegetation limits the ecological value
for migrating fish. Mowing and maintaining the lawn on the landward side of the bulkhead also
limits the establishment of native vegetation, reducing the overall ecological value of this
shoreline.
Due to the mostly high-energy shoreline, lack of riparian vegetation, ongoing maintenance of the
lawn, shoreline ecological functions are limited within the subject property.
Fish and Wildlife
No fish or wildlife species were directly observed at the time of investigation. The Washington
Department of Fish and Wildlife (WDFW), Pacific States Marine Fisheries Commission
(PSMFC), and the Washington Dept. of Natural Resources (WADNR) are the primary agencies
that provide publicly available information used for making fish presence determinations
consistent with the water typing rules set forth in WAC 222-16-030. The following information
represents the findings from each source.
WDFW SalmonScape Map Tool
SalmonScape is an online GIS database that contains publicly available resource information
for fish population studies and general species distribution (both documented and modeled
presence).
Within Lake Washington, the following species are depicted:
• fall Chinook (documented presence),
• coho (documented presence),
• winter steelhead (documented presence),
• sockeye salmon (documented presence),
• bull trout (documented rearing),
• kokanee (documented presence)
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PSMFC StreamNet Map Tool
StreamNet is a fish distribution database maintained by the PSMFC as a regional clearinghouse
for fish data. In the vicinity of the project area, fish presence is only depicted within Lake
Washington. StreamNet states the presence of the following species:
• fall Chinook (migration only)
• coho (migration only)
• sockeye salmon (migration only)
• winter steelhead (migration only)
• bull trout (migration only)
WDNR Forest Practices Activity Mapping Tool (FPAMT)
FPAMT is an online GIS database that aids the process of submitting a Forest Practices permit
application. The tool is useful for the purposes of this study because WADNR models fish
presence. FPAMT depicts Lake Washington as a fish-bearing shoreline of the state. No other
streams are noted in the vicinity of the project.
WDFW Priority Habitat and Species (PHS) Maps
No terrestrial priority habitats are listed on or near the site. Aquatic priority habitats for the
above listed species are noted on the PHS maps.
Measures to Protect Trees
No significant trees are currently located within the boundary of the subject property and
therefore no protection measures are proposed.
No Net Loss of Shoreline Ecological Function
The existing condition of the shoreline provides limited ecological value due to its developed and
maintained condition. The applicant proposes replace the existing structure, reduce the overall
on-site impervious surface and re-vegetate the majority of the existing lawn. Construction may
cause temporary impacts to ecological function, but these impacts are not significant enough to
be measurable. The long-term benefit of this project lies in the reduction of impervious surface
and the planting of native vegetation. Establishment of native vegetation will reduce the existing
impaired condition of the shoreline buffer and provide for an overall improvement in Shoreline
Ecological Function.
SHORELINE MITIGATION PLAN (LAKE STUDY, SUPPLEMENTAL) 3.0
The applicant is proposing to reduce the shoreline buffer from 100 feet to 65 feet by
implementing a Shoreline Mitigation Plan that will significantly increase the shoreline ecological
function for the subject property. Therefore the intent of this is to address this proposed buffer
reduction and demonstrate the improvement in ecological function.
SMC 25.06.020(1) requires that mitigation for environmental impacts be applied in the following
order. The applicant’s response immediately follows each sequencing principle (as indented,
italicized text).
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ALTERNATIVES ANALYSIS 3.1
Avoidance
Avoiding the impact altogether by not taking a certain action or parts of an action;
The applicant is proposing to replace the existing house with a new structure that is located closer to the
lake. This is the only feasible location for the new house given the required front yard setbacks and the
location of the adjacent houses to both the north and south.
Minimization
Minimizing impacts by limiting the degree or magnitude of the action and its implementation by
using appropriate technology or by taking affirmative steps to avoid or reduce impacts;
Impact minimization will be achieved in the following ways:
• The house was designed to be placed mostly within the footprint of the existing structure, but will
extend slightly closer to the lake;
• BMPs will be implemented to minimize the potential for sedimentation to the lake; and
• Materials selection does not include wood treated with toxic compounds.
Rectification
Rectifying the impact by repairing, rehabilitating, or restoring the affected environment;
The affected environment in this case is buffer zone. Rectification is not practical for this project because
repair, rehabilitation, and restoration could only be achieved by, for example, removing existing house. No
opportunities for rectification are known to exist for this project.
Reduction
Reducing or eliminating the impact over time by preservation and maintenance;
The proposed structure will be regularly maintained and preserved by the Homeowner, to reduce the
frequency of short-term impacts associated with repair/replacement actions.
Compensation
Compensating for the impact by replacing, enhancing, or providing substitute resources or
environment;
As mitigation for the proposed buffer reduction, the applicant proposed to enhance a large portion of the
remaining 65-foot buffer with native species.
IMPACT EVALUATION 3.2
(a) Identification, by characteristics and quantity, of the resources (stream, lake) and
corresponding functional values found on the site;
Lake Washington, a Type S water is the only critical area located on the site. Given the existing developed
nature of the subject property, the ecological function provided by the on-site buffer is limited (refer to ecological
function section of this report).
(b) Evaluation of alternative locations, design modifications, or alternative methods of
development to determine which option(s) reduce(s) the impacts on the identified resource(s) and
functional values of the site;
Given that this is a narrow waterfront single-family lot, alternative locations for a new house are not feasible.
If the proposed house location were modified, it’s likely that the overall impervious surfaces and impact would
be similar.
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(c) Determination of the alternative that best meets the applicable approval criteria and identify
significant detrimental impacts that are unavoidable;
By implementing the proposed mitigation plan, this project meets the applicable review criteria and has no
detrimental impacts. Implementation of this mitigation plan will have an improvement in the overall ecological
function of the site.
(d) Evaluation of the cumulative impacts on the system, to the extent that the site resources and
functional values are part of a larger natural system such as a watershed;
Given that implementation of this plan will increase the overall ecological function of the shoreline area, this
project has the potential to have a cumulative benefit (if other shoreline mitigation projects are implemented).
(e) Evaluation, for shorelines regulated by RMC 4-3-090, of how the preferred alternative
achieves the standard of no net loss of ecological functions under RMC 4-3-090D2;
As previously stated implementation of this plan has the potential for provide a lift in shoreline ecological
function.
(f) Evaluation of each of the mitigation plan criteria found in RMC 4-3-050K1, Mitigation Plan
Required.
The mitigation plan has been specifically designed to meet the requirements of RMC 4-3-050.
PROPOSED MITIGATION 3.3
The applicant proposes to offset potential impacts associated with a buffer reduction by installing
native vegetation within the majority of the remaining 65-foot buffer. The proposal is expected to
improve shoreline ecological function by removing a large portion of the maintained lawn
increasing structural diversity within the buffer by providing overhanging vegetation, and by
providing future sources of small and large wood recruitment. Design, specifications and location
of the proposed plantings are depicted on the Landscape Plan for the Napoli Residence prepared
by Kenneth Philp, LA.
Shoreline Enhancement Planting Plan
Common Name Latin Name Size Quantity
Serviceberry Amelanchier alnifolia 5-6’ tall 3
Oregon grape Mahonia nervosa 1 gallon 37
Flowering currant Ribes sanguineum 5 gallon 6
Evergreen huckleberry Vaccinum ovatum 5 gallon 41
Mountain spirea Spiraea splendens 5 gallon 14
Idaho fescue Festuca idahoensis 1 gallon 37
Oregon Iris Iris tenax 1 gallon 35
Tufted hair grass Dechampsia cespitosa 1 gallon 41
Kinnikinnik Arctostaphylos uva-ursa 1 gallon 634
Sword fern Polystichum munitum 1 gallon 36
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PROJECT MONITORING PROGRAM
Requirements for monitoring project:
1. Initial compliance/as-built report
2. Semi-annual site inspection (in the spring and in the fall) for years 1-3
3. Annual site inspection (in the spring) for years 4-5
3. Annual reports including final report (one report submitted in the fall of each monitored year)
Purpose for Monitoring
The purpose for monitoring this mitigation project shall be to evaluate its success. Success will be
determined if monitoring shows at the end of five years that the definitions of success stated
below are being met. The property owners shall grant access to the mitigation area for inspection
and maintenance to the contracted landscape and/or wetland specialist and the City of Renton
during the period of the bond or until the project is evaluated as successful.
Monitoring Methodology
During the as-built site visit, representative photo points shall be selected. Photos shall be taken
from the same location during each monitoring year to establish a record of plant growth
throughout the monitoring period. The exact location of permanent photo points shall be
depicted in the as-built report, and Year 0 photographs shall be included in the as-built letter.
Vegetation sampling shall be conducted as a qualitative assessment, for the purpose of
establishing approximate invasive cover and installed species cover. Total invasive cover will be
determined as follows: the contracted biologist will record approximate invasive species coverage
within the planting area. Total observed invasive species cover will be divided by the total
enhancement area, yielding approximate invasive cover. The findings will be presented in each
annual report. Total observed native species cover will be divided by the total enhancement area,
yielding approximate areal coverage. The findings will also be presented in each annual report.
Conducting a rough qualitative assessment of invasive species cover and installed plant cover is
an adequate reporting measure given the small total planting area. Each monitoring report will
establish an approximate percent coverage of invasive species, which will serve as the basis for
maintenance recommendations. Maintenance shall occur following any monitoring report
documenting an increase in invasive species cover, even if cover is reported below ten percent.
Report Contents
Annual monitoring reports shall be submitted by October 31 of each year during the monitoring
period. As applicable, monitoring reports must include descriptions / data for:
1. Site plan and vicinity map
2.Historic description of project, including date of installation, current year of monitoring,
restatement of mitigation / restoration goals, and performance standards
3. Plant survival and areal coverage for every plant community,
4. Monitoring methodology in the context of assessing performance standards,
5. Assessment of nuisance / exotic biota and recommendations for management
6. Color photographs taken from permanent photo-points
PROJECT SUCCESS AND COMPLIANCE
Upon completion of the proposed mitigation project, an inspection by a qualified biologist will be
made to document correct mitigation installation. A compliance letter will be supplied to the City
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of Renton for review, within 30 days after the completion of planting. City review and
acceptance of the as-built letter is required prior to commencement of the 5-year monitoring
period.
A landscape professional or wetland biologist will perform monitoring of the plantings annually
in the spring and fall for the first three years, and in the fall only for years four and five. A written
report describing the monitoring results will be submitted to the City of Renton after the fall site
inspection of each monitored year. Final inspection will occur five years after completion of this
project. The contracted consultant will prepare a final report describing the project in the context
of success standards. If the project does not meet the below Definitions of Success in year five,
additional years of monitoring will occur until the project is considered successful. The bond will
not be released until a final monitoring report is submitted that deems the project successful.
City of Renton Contact
Certain actions within the wetland and buffer mitigation areas may require inspection or
approval by City of Renton staff. Requests for inspection/approval shall be coordinated with the
City.
Definition of Success
Performance standards have been established to assess the success of the mitigation project.
Performance standards are as follows:
Year 1 Monitoring
Success Standard: 100 percent survival of installed woody species
No greater than 15 percent coverage of invasive species
Year 3 Monitoring
Success Standard: 90 percent survival of installed species
No greater than 15 percent coverage of invasive species
New growth of woody plants shall be observable and documented
Year 5 Monitoring
Success Standard: 80 percent survival of installed woody species
No greater than 10 percent coverage of invasive species
New growth of woody plants shall be observable and documented
Maintenance
This mitigation project will require periodic maintenance to replace mortality of installed species.
Maintenance is also necessary to control invasive, non-native plant species and competing
grasses. The planting areas will be maintained in the spring of each year for the five-year
monitoring period, and in the fall if recommended by the contracted biologist. Maintenance will
include hand removal of competing grasses and non-native vegetation from a 2-foot diameter
ring surrounding a given plant. Removal of invasive species shall be done by hand to decrease
the likelihood of damage occurring to the plantings. All blackberry, reed canarygrass, and other
aggressive invasive species sprouting anywhere within ten feet of the planting area shall be
removed during each maintenance period. Herbicide use is prohibited.
Following each monitoring site visit, recommendations will be made for the replacement of plant
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mortality and other general maintenance. All maintenance recommendations related to invasive
cover shall be addressed within 45 days of the date written on the annual report requiring action,
and the City shall be supplied with a letter documenting how these recommendations were
addressed. If necessary, re-planting shall occur in the fall, and a brief memo will be drafted and
submitted to the City of Renton indicating that re-planting has successfully occurred.
Contingency Plan
If, during any of the inspections, more than 20 percent of woody plants are severely stressed, or it
appears more than 20 percent may not survive, additional plantings of the same species or, if
necessary, alternative species may be added to the planting area. If this situation persists into the
next inspection, a meeting with a representative for the City of Renton, the consulting wetland
biologist and the property owner will be scheduled to decide upon contingency plans. Elements
of the contingency plan may include, but will not be limited to more aggressive weed control,
plant mortality replacement, species substitution, fertilization, and/or soil amendments.
PERFORMANCE BONDING
A performance bond or other assurance device shall be provided to the City of Renton for the
period of five years from the completion of the project, in the amount of 150% of the estimated
cost for plant material and labor, maintenance, and monitoring. This bond shall be released at
the end of five years, upon a successful determination by the City of Renton related to the above
Definitions of Success.
Total Estimated Project Cost *
Plants and Labor $11,734
Installation Costs $4,445
Mulch $650
Maintenance $3,600
Monitoring $4,500
Total Estimated Project Cost $24,929
*Total Estimated Project Cost calculated using amounts from the King County Bond Quantity Worksheet.
Total Estimated Bond Amount (150% of Estimated Project Cost) $37,393.50
USE OF THIS REPORT 4.0
This Lake Study and Conceptual Shoreline Mitigation Plan is supplied to Giovanni Napoli as a
means of determining the presence of critical habitat, as required by the City of Medina during
the permitting process. This report is based largely on readily observable conditions and, to a
lesser extent, on readily ascertainable conditions. No attempt has been made to determine
hidden or concealed conditions.
The laws applicable to salmonid habitat are subject to varying interpretations and may be
changed at any time by the courts or legislative bodies. This report is intended to provide
information deemed relevant in the applicant's attempt to comply with the laws now in effect.
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The work for this report has conformed to the standard of care employed by ecologists. No other
representation or warranty is made concerning the work or this report and any implied
representation or warranty is disclaimed.
Wetland Resources, Inc.
Scott Brainard, PWS
Principal Ecologist
REFERENCES 5.0
Kerwin, J. 2001. Salmon and Steelhead Habitat Limiting Factors Report for the Cedar – Renton
Basin (Water Resource Inventory Area 8). Washington Conservation Commission. Olympia,
WA.
http://www.pugetsoundnearshore.org/supporting_documents/WRIA_8_LFR_FINAL.pdf.
Accessed December 2016.
NOAA National Weather Service Forecast Office, Seattle, Washington.
http://www.weather.gov/climate/index.php?wfo=sew. Accessed December 2016.
Olson, P. and E. Stockdale. 2010. Determining the Ordinary High Water Mark on Streams in
Washington State. Second Review Draft. Washington State Department of Ecology, Shorelands
and Environmental Assistance Program. Lacey, WA. Ecology Publication # 08-06-001.
StreamNet. 2016. StreamNet Mapper. http://www.streamnet.org/mapping_apps.cfm. Accessed
December 2016.
U.S. Fish and Wildlife Service. National Wetland Inventory (NWI). Wetlands Mapper.
http://www.fws.gov/wetlands/. Accessed December 2016.
Washington State Department of Fish and Wildlife (WDFW). 2016. Priority Habitats and Species:
PHS on the Web. (http://wdfw.wa.gov/mapping/phs/). Accessed December 2016.
Washington State Department of Fish and Wildlife (WDFW). 2016. SalmonScape.
(http://wdfw.wa.gov/mapping/salmonscape/index.html). Accessed December 2016.
OHWM
LAKE WASHINGTON
TYPE S WATER
OHWM
LEGEND
PROPERTY BOUNDARY
LAKE STUDY MAP
NAPOLI - MOUNTAIN VIEW AVE N
PORTION OF SECTION 31 , TOWNSHIP 24N , RANGE E, 5W.M.
Delineation / Mitigation / Restoration / Habitat Creation / Permit Assistance
9505 19th Avenue S.E. Suite 106 Everett ,Washington 98208
Phone: (425) 337-3174
Fax: (425) 337-3045
Email: mailbox@wetlandresources .com
6/8/2018
Napoli - Mountain View Ave N
Giovanni Napoli
1205 N 27th Place
Renton, WA 98056
City Of Renton
Lake Study Map Map
Drawn by:
Project Number: 18022
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Scale 1" = 100'
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