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Community & Economic Development Department
CE. "Chip"Vincent, Administrator
November 3, 2015
Kate Knox Machata
7K Environmental
4062 NE gy'h St
Seattle, WA 98115
SUBJECT: "Off Hold" Notice
2816 Kennewick Critical Area Exemption/ LUAlS-000761, CAE
Dear Kate Knox Machata:
The Planning Division of the City of Renton accepted the above master application with
the revised enhancement plan for review on October 12, 2015. During our review for
the subject Critical Areas Exemption request, staff determined that additional
information was necessary in order to proceed further. Specifically, because work is
proposed within the Class 4 stream and below the Ordinary High Water Mark,
Environmental (SEPA) Review is required. Staff sent you an "On-Hold" letter on October
27, 2015 pending your submittal of additional information.
On October 28, 2015, you requested that the proposed removal of armoring within the
stream be removed from the Critical Areas Exemption request so that the buffer
mitigation proposal could move forward through the review process. Staff has
separated the in-water work from the proposal and is proceeding with review of the
exemption request without any in-water work. Staff will likely condition any approval
with a requirement that the in-water work and Environmental Review application be
submitted within a reasonable time period so that the removal of the armoring can be
accomplished next year.
At this time, your project has been changed to "off hold" and is continuing through the
review process. Please contact me at (425) 430-6593 if you have any questions.
Sincerely,
fdA.~ ~·.., :tr'l,,,,o
Kris Sorensen
Associate Planner
cc: Alyssa Tran and Tony Ly/ Owner/ Applicant
Renton City Hall • 1055 South Grady Way • Renton, Washington 98057 • rentonwa.gov
DEPARTMENT OF COMM Ur ------•·If en ton AND ECONOMIC DEVELOPMENT
DATE:
PROJECT NUMBER:
PROJECT NAME:
PROJECT MANAGER:
APPLICANT:
CONTACT:
LOCATION:
DESCRIPTION:
CRITICAL AREA:
PLANNING DIVISION
CERTIFICATE OF EXEMPTION
FROM CRITICAL AREAS REGULATIONS
EVALUATION FORM & DECISION
November 03, 2015
LUA15-000761
2816 Kennewick Stream and Buffer Enhancement
Kris Sorensen, Associate Planner
Alyssa Tran
18364 160th Pl SE
Renton, WA 98058
Kate Knox Machata, 7K Environmental
4062 NE 87th St
Seattle, WA 98115
2816 KENNEWICK PL NE
The applicant is requesting a Critical Areas Exemption for SEPA exempt
activities for enhancement of a stream buffer at 2816 Kennewick Pl NE (PID
334210-3365). The subject site is within the Residential 8 (R-8) zone. An
unnamed creek and a tributary of May Creek runs through the rear yard of the
single-family residential site, in an open channel, and enters a culvert at the
northeast corner of the site where the creek then continues under NE 29th St.
The creek was classified as a Class 4 stream when the new home was
constructed in 2012 and when work in the stream and buffer were conducted
without required City approvals. The proposed plant mix in the buffer consists
of Tall Oregon Grape, Red Flowering Current, Ocean Spray, Sword fern, and Wild
Strawberry. The buffer area on the both sides ofthe creek is approximately
1,300 square feet. The site is located within the Wellhead Protection Area Zone
2. Small slopes between 15 and 25 percent are located near the creek area on
the site. A stream study and mitigation plan of the restoration proposal was
submitted by a Professional Wetland Scientist, Kate Knox Machata of 7k
Environmental dated August 31, 2015 (revised September 17, 2015). This study
concludes that an increase in ecosystem function is anticipated with the
implementation ofthis restoration plan.
Class 4 Unnamed Stream and Stream Buffer
EXEMPTION JUSTIFICATION: Renton Critical Areas Regulations, RMC 4-3-050C.5.a.iii "Exempt Activities -
Permitted within Critical Areas and Associated Buffers" iii. Approved Restoration /Mitigation activities
Page 1 of 4
City of Renton Department of Community e 1omic Development
2816 Kennewick Stream and Buffer Enhancement
Certi of Exemption from Critical Areas Regulations
LUA15-000761
approved by the City.
FINDINGS: The proposed development is consistent with the following findings pursuant to
RMC section 4-3-050C.5:
1. The activity is not prohibited by this or any other chapter of the RMC or state or federal law or regulation.
2. The activity will be conducted using best management practices as specified by industry standards or
applicable Federal agencies or scientific principles if submitted plans are followed and the conditions of
approval of this exemption are met.
3. Impacts will be minimized and disturbed areas will be immediately restored, if submitted plans are followed
and the conditions of approval of this exemption are met.
4. Where wetland or buffer disturbance occurs during construction or other activities in accordance with this
exemption, the site will be revegetated with native vegetation as required as a condition of approval for this
exemption.
DECISION: An exemption from the Critical Areas Regulations is hereby Approved with
Conditions*.
Page 2 of 4
City of Renton Department of Community & omic Development CertiJ. of Exemption from Critical Areas Regulations
2816 Kennewick Stream and Buffer Enhancement LUAlS-000761
CONDITIONS: 1. The bank armoring to be removed as identified on the approved planting plar
is not approved through this Critical Areas Exemption. A separate exemption
and Environmental (SEPA) Review process is required for the bank armoring
removal proposal. This separate permit shall be submitted to the City within
180 days (or 6 months) ofthis permit approval.
2. The applicant shall provide a monitoring report one-year following the
installation ofthe approved stream buffer plantings, to Current Planning Project
Manager, Kris Sorensen, for review and approval.
a. The monitoring report shall be prepared by a biologist or stream specialist
with an analysis ofthe approved mitigation/enhancement plan, the numbers
and types of plants planted, survival of the plants, and recommendation for
replacing of plants if they are dead, decaying, or not suited for the site.
b. The biologist or stream specialist shall provide a recommended planting
plan for any plants that need to be replaced.
c. The applicant shall install the plants recommended to be replanted by the
specialist once the Current Planning Project Manager has reviewed and
approved the one-year monitoring plan.
3. No mechanical equipment shall be used to install the
mitigation/enhancement plantings within stream buffer areas.
4. The applicant shall contact Current Planning Project Manager, Kris Sorensen,
425-430-6593, following installation ofthe approved mitigation /enhancement
plan for inspection and final approval.
5. No cutting or maintenance of grasses or other native vegetation shall be
allowed within the stream buffer area unless such maintenance is required for
the establishment period of the approved stream buffer
mitigation/enhancement plan. Maintenance of invasive plants may be allowed
provided it is consistent with the approved planting plan, for a period of 5 years
after which a new Critical Areas Exemption would be required.
SIGNATURE & DATE OF DECISION :
November 03, 2015
Date
The above land use decision will become final if the decision is not appealed within the 14-day appeal
period (RCW 43.21.C.075(3); WAC 197-11-680).
Page 3 of 4
City of Renton Department of Community & omic Development
2816 Kennewick Stream and Buffer Enhancement
CertiJ of Exemption from Critical Areas Regulations
LUAlS-000761
APPEALS: An appeal of this administrative land use decision must be filed in writing together with the
required fee to the City of Renton Hearing Examiner, City of Renton, 1055 South Grady Way, Renton, WA
98057, on or before 5:00 p.m., on November 17, 2015. RMC 4-8-110 governs appeals to the Hearing
Examiner and additional information regarding the appeal process may be obtained from the Renton City
Clerk's Office, (425) 430-6510.
RECONSIDERATION: Within 14 days of the decision date, any party may request that the decision be
reopened by the approval body. The approval body may modify his decision if material evidence not readily
discoverable prior to the original decision is found or if he finds there was misrepresentation of fact. After
review of the reconsideration request, if the approval body finds sufficient evidence to amend the original
decision, there will be no further extension of the appeal period. Any person wishing to take further action
must file a formal appeal within the 14-day appeal time frame.
EXPIRATION: Five (5) years from the date of decision (date signed).
Attachments: Stream Study and Planting Plan
Page 4 of 4
I
THAT PORTION OF THE SW 1/4 , ~, SECTION_ll___TOWNSHIP ..2A._ NORTH, RANGE..Q.5_ EAST, W.M
LY & TRAN RESIDENCE
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LEGAL DESCRIPTION:
HILLMANS LAKE
GARDEN OF EDEN #1
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VOL. 11, PG. 63
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SITE PLAN
re'DCRON1:S k ASSOC. O!J LAND SURVEYORS
-----.. &111:t::=
'1' 7K Environmental
Kate Knox Machata
7K Environmental
4062 NE 87'h St.
Seattle, WA 98115
Kris Sorensen
Planning Division,
Community & Economic Development
City of Renton
1055 South Grady Way
Renton, WA 98057
August 31, 2015
(Revised September 17, 2015)
RE: Buffer Enhancement Permit Application far Alyssa and Tony Tron (Parcel number 334210-
3365}
Dear Mr. Sorensen:
With this letter report, we are requesting critical areas exemption from the City of Renton for proposed
buffer enhancement work in parcel 334210-3365. Additional materials are attached to meet permit
submittal requirements as indicated on the Exemption from Critical Areas Regulations checklist.
Project Introduction
In August 2015, 7K Environmental was contracted to assist Alyssa and Tony Tran with permit
preparation for buffer enhancement plantings which will also provide visual privacy from adjacent
properties and help to limit trespass in the stream buffer adjacent to their home. This report has been
prepared to describe existing conditions on the site, discuss existing ecological functions in the stream
buffer, and provide details of the proposed stream and buffer enhancement activities along the
unnamed stream that crosses their property. This letter report is designed to serve as the Standard
Stream Study and Biological Assessment per Renton Municipal Code (RMC) 4-8-1200.
Project Site Description and Landscape Position
The Tran property (Parcel .number 334210-3365) is located at 2816 Kennewick Place NE in the City of
Renton (see Figure 1 provided by City of Kent). This parcel lies approximately 600 feet east of 1-405 in
the developed urban neighborhood of Kennydale. A small, unnamed tributary of May Creek (See Figure
2) with an average ordinary high water (OHW) width of 2 feet lies near the northern edge of the Tran
Page 2
property. No wetlands were observed on the property or adjacent to the property boundary as far as
was visible from the Tran property.
The unnamed tributary has a small watershed (estimated to be about 40 acres in size) upstream from
the subject parcel. Approximately 80 feet upstream from the parcel, the stream is impounded by a 2-3
foot high concrete dam. A 24-inch diameter CMP culvert carries water west under NE 29th Street. The
stream conveys water approximately 700 feet north and west to its confluence with May Creek which
joins Lake Washington approximately one mile further north and west. May Creek is known to be a fish
bearing stream with documented presence with possible spawning for fall Chinook and coho salmon and
winter run steel head. No fish presence has been noted in the unnamed tributary on the Tran property
(SalmonScape 2015).
Site History
The Tran's purchased the subject parcel in 2011. The existing dilapidated structure was demolished in
2012, and site grading was completed to allow for construction of a new residence under the new single
family residence combination permit number CP12039. Existing uses in the vicinity of the channel prior
the new construction (See Figure 2) included a home with landscaped yard including a swimming pool,
fence, and rock terrace retaining wall which paralleled the channel, approximately 15 feet to the south.
Regulatory Framework
The regulatory framework for work along the stream and in its buffer must consider federal, state and
local level jurisdiction.
Federal Jurisdiction
As a tributary of May Creek which flows to Lake Washington, the unnamed tributary to May Creek on
the Tran property is considered a Water of the United States, and thus will be regulated under Section
404 of the Clean Water Act. The U.S. Army Corps of Engineers (ACOE) regulates work below Ordinary
High Water (OHW). Federal permits may be required for any work that occurs below OHW.
The ACOE Nationwide permit 18 allows for minor discharges as follows:
18. Minor Discharges. Minor discharges of dredged or fill material into all waters of the United
States, provided the activity meets all of the following criteria: (a) The quantity of discharged
material and the volume of area excavated do not exceed 25 cubic yards below the plane of the
ordinary high water mark or the high tide line; (b) The discharge will not cause the loss of more
than 1/10-acre of waters of the United States; and (c) The discharge is not placed for the
purpose of a stream diversion. Notification: The permittee must submit a pre-construction
notification to the district engineer prior to commencing the activity if: (1) The discharge or the
volume of area excavated exceeds 10 cubic yards below the plane of the ordinary high water
mark or the high tide line, or (2) the discharge is in a special aquatic site, including wetlands.
(See general condition 31.) (Sections 10 and 404).
Page 3
If any work in the channel is proposed and is limited to streambank stabilization and has discharge
below 10 cubic yards and does not result in stream diversion, no ACOE pre-construction notification
should be needed.
State Jurisdiction
The Washington State Department of Ecology regulates water quality under Section 401of the Clean
Water Act. If the project impacts are less than (temporary or permanent impacts) Y, acre of wetland, no
individual 401 review is required. An Hydraulic Project Approval (HPA) would be required for any work
below OHW. Most construction projects or activities in or near state waters are required to obtain an
HPA from Washington Department of Fish and Wildlife (WDFW) which is designed to ensure projects
meet state conservation standards to protect fish life. Larry Fisher is the regional wildlife biologist. An
HPA application can be completed by filling out the on line application form located at the website
address http:1/wdfw. wa.gov/licensing/hpa/.
Loco/Jurisdiction: City of Renton
Local code provides for protection of critical areas including streams and their buffers. Based on current
2015 code guidance, the unnamed tributary crossing the Tran property is a City of Renton Stream Class 4
(See Figure 3). Class 4 streams have buffer use restrictions for a standard width of 35 feet. Per the
code, these buffer widths assume degraded buffers with no enhancement. Code allows that narrower
buffers may be permitted under restored or improved buffers that restore and protect riparian
functions. This parcel had a previous legal alteration that occurred within the buffer decades ago in the
form of a retaining wall and fence.
Existing Conditions
The stream and its buffer at this property exhibit characteristics of a heavily urbanized its riparian
environment (see Photographs 1-3). The stream lies at the northern edge of the Tran property. The
Tran property boundary extends a minimum of 5 feet and up to approximately 13 feet north of the
stream. Adjacent land use on the parcel to the north of the channel is a residence with fenced yard. A
line of western red cedar trees parallels the property line. Vegetation in the herb and shrub layer on the
north side of the stream is sparse due to the dense canopy cover formed by the line of cedar trees (see
Photograph!). Many lower branches of the cedars were cleared by the neighbor in late July or early
August 2015 which has opened up the understory to some extent along the western edge of the
properties. Vegetation on the south bank of the stream is currently maintained lawn up to a rock
terrace which effectively stabilizes the slope leading up to the home.
The stream bed lies in swale that is approximately 6 -8 feet lower than surrounding topography. A
topographic map showing 2 foot contours in the vicinity of this property is provided in Figure 4. The
stream is approximately 2 feet wide at OHW along the length of the channel on the Tran property
(approximately 80 linear feet). Along much of the stream, the banks were stabilized with reused
concrete riprap that appears to have been placed at least several decades ago. Hollow concrete blocks
were placed more recently along 27 linear feet of the northern bank of the channel. The block is
proposed to be removed and banks will be stabilized with rushes and/or sedges. The stream bed
substrate is composed of a mix of sand and gravel with some silt. Some of the gravel-sized material is
Page4
chunks of angular broken concrete. Flows are regulated by a dam on private property that is about 100
feet upstream from the Tran property. A culvert at the west edge of the property conveys water under
NE 29th Street and off the property.
Existing Stream Buffer Functions
Intact riparian buffers provide important ecological functions that can be described as supporting
Hydrology, Biogeochemistry, Plant Community and Habitat/Fauna! Support systems (following Brinson
et al. 1993, Brinson et al. 1995, and AC Kindig 2003.). Riparian buffers in an urban environment are
commonly degraded from decades of human encroachment and provide ecological functions to varying
degrees. Hydrology functions provided by riparian buffers may include maintenance of water quality to
downstream waters including stream temperature regulation, and regulation of water quantity from
delaying or retaining precipitation and stormwater runoff. Biogeochemistry functions provided by urban
riparian buffers may include regulation of sediment and nutrient inputs to downstream waterways
through streambank stabilization and filtration of runoff from upgradient systems. Riparian buffers may
support diverse native and/or non-native plant communities. These plant communities may provide
limited habitat opportunities for aquatic species, small birds or mammals, and beneficial insects with life
history strategies that allow survival in narrow corridors within the urban environment. In this urban
corridor, the primary goals for protecting and enhancing riparian buffers are to support cleaner water,
stream temperature regulation, stream bank stabilization, and to a limited degree provide improved
habitat for aquatic species and wildlife that can survive in the urban environment.
Ecological functions provided by the riparian buffer along the unnamed tributary to May Creek are
described under existing conditions in the sections below. The next section describes the proposed
buffer restoration and enhancement activities and assesses potential for improvement in ecological
functions that may result from this work.
Hydrology Functions
Under existing conditions, the stream and its buffer provide minimal to no hydrology functions with
enhance water quality or regulating stormwater runoff. Tree canopy cover occurs only on the northern
bank of the channel. The channel is recessed within the shallow ravine and is partially shaded by these
trees during mid-summer. These trees also intercept some precipitation to help reduce storm runoff
entering the stream. The channel banks are nearly vertical with rip rap lining much of the channel on
both sides. Sediment transport may occur to the stream from bare soil below the cedar canopy. Intact
lawn grass on the southern bank reduces potential for transport of sediment to the stream from
erosion. The existing retaining walls upslope from the stream reduce precipitation runoff from the
upslope urban environment.
Bioqeochemistry Functions
Under existing conditions, the stream and its buffer provide low to moderate biogeochemistry
functioning. There is minimal vegetation in contact with the stream during normal flows due to riprap
along steep channel banks. The plant community is maintained lawn to the south and bare herb layer
on the north and thus there is minimal potential for nutrient uptake and transformations in the riparian
buffer.
Page 5
Plant Community Functions
The cedar trees paralleling the property line are a native tree species. The rest of the riparian buffer is
dominated by non-native, predominantly herbaceous species including weeds, lawn grasses, and
horticultural plants. The northern bank has only sparse vegetation in the understory. Under existing
conditions, the stream and its buffer provide low to moderate plant community functions. The cedar
tree canopy to the north of the stream provides a slight potential for insect and litterfall input to the
creek that could support downstream aquatic food web cycling.
Fauna/ Support/Habitat Functions
Minimal to no native fauna! support or habitat functions are provided within the stream or its riparian
buffer under its existing conditions. No fish are known to occur within this small, 2-foot wide, unnamed
tributary. There is little habitat structure within the channel due to the straight, rip rap lined bank. The
sparse understory plant community and adjacent developed areas limit potential species that could
utilize this habitat. However, ducks and deer have been seen in this riparian corridor (A. Tran, Pers.
Comm. 2015).
Proposed Project
Planting Plan
The proposed planting plan is provided in Figure 5. A row of native plants will be installed along the
north property boundary to provide dual function of designed visual privacy and limiting trespass and
restoring native plant community functions. The row of tall Oregon grape (Mahonia aquifolium) will be
planted at 3-foot spacing in a row that parallels the property boundary and south of the row of cedar
trees per Figure 5. The proposed planting area occupies approximately 110 square feet in the stream
buffer.
Removal of Concrete Block
Approximately 27 linear feet of vertical concrete block will be removed from the north bank of the
channel. This stream bank in this area will be restored to soft banks and stabilized with native rushes
(Juncus effusus, Juncus acuminatus) and/or native sedges (Carex utriculata, Carex lenticularis var.
lipocarpa).
Construction Sediment and Erosion Control Measures
Construction best management practices will be used during plant installation to prevent discharge of
sediment to the stream. Mulch will be applied at the base each shrub as needed. Fertilizers should not
be used given proximity to the stream. In-stream work to remove the bank armoring block will be done
using work area isolation to minimize sediment disturbance. A typical for work area isolation is shown
in Figure 6.
Page 6
Analysis of Project Effects
The scale of the proposed planting project is very small and thus potential lift for ecosystem functions is
limited. The proposed project will provide minor, incremental positive impact to ecosystem functioning
in the riparian buffer.
Hydrology Functions
Increasing shrub canopy cover in the riparian buffer will provide incremental benefits to regulation of
stream temperatures along this 80 foot long reach of the stream. However, as the proposed planting is
on the north side of the channel, minimal additional shading will be provided. Some of the shrubs may
overhang the channel as they grow larger. Additional vegetation and development of shrub and herb
canopy layers below the tree layer will intercept additional precipitation during storm events. Removal
of the concrete block and restoration of herbaceous vegetation on the stream bank may provide minor
reduction in stream velocity to delay stormwater relative to current condition with the concrete block.
The proposed project will result in minor and incremental increase in hydrology functions in the stream
and its buffer.
Bioqeochemistry Functions
Increasing plant cover and diversifying the plant community throughout the riparian buffer will
incrementally improve biogeochemical cycling opportunities in this short reach along the stream.
Restoring the channel bank to soil with native herbaceous vegetation for bank stabilization will provide
minor opportunity for nutrient retention along the channel. Due to the small area and single native
shrub species proposed, minimal changes to biogeochemical functioning in the buffer will be realized
from the proposed project.
Plant Community Functions
The proposed project will incrementally increase the native plant diversity within a portion of the buffer
by developing an understory shrub canopy cover below the cedar trees. This shrub canopy cover may
provide greater shade cover over the stream that could help to regulate stream temperatures.
Installing the row of native plants in the buffer is designed to limit human access to the stream and area
immediately adjacent to the stream. The proposed project will have a minor and incremental increase
in plant community functions in the stream buffer.
Fauna/ Support/Habitat Functions
Although only a very small incremental increase in native plant diversity is proposed, increased diversity
in native plant community will incrementally increase the opportunities for foraging birds and beneficial
insects. There are limited opportunities for improving fauna I support functions due to the heavily urban
environment in the surrounding landscape. Due to the scale of this project there will be little to no
change in fauna I support/habitat functions due to the proposed planting project.
Recommended Project Conditions
• No pesticides or fertilizers shall be used north of the fence or rock retaining wall. Grass north of
the rock wall should be left to grow and should not be mowed.
Page 7
If shrubs die, replant in place with the same species or alternate native species from the list in
Appendix A.
Conclusions
In conclusion, the proposed project includes planting shrubs and herbs along approximately 80 linear
feet of riparian buffer for an unnamed tributary of May Creek. Approximately 20 native shrubs [tall
Oregon grape (Mahonia aquifolium)] will be installed in the riparian buffer covering approximately 110
square feet. Bank armoring will be removed from a section of the stream. Sediment and erosion
control measures are proposed to protect water quality in the stream during the installation and
establishment period. The proposed project will provide minor incremental lift in ecosystem functions
along this short reach of stream.
We are happy to discuss the proposed project in further detail. Please contact the homeowner Alyssa
Tran at 206-307-1874 and/or Kate Knox Machala at 206-683-7229 or via email at
a.kate.knox@gmail.com if additional information is needed.
Sincerely,
Kate Knox Machala, M.S.
Professional Wetland Scientist #2104
7K Environmental
Page 8
References
AC Kindig & Company and Cedarock Consultants. 2003. City of Renton Best Available Science Literature
Review and Stream Buffer Recommendations. Prepared for the City of Renton dated February 27, 2003.
Brinson, M.M. 1993. A hydrogeomorphic classification for wetlands. Wetlands Research Program
Technical Report WRP-DE-4. Waterways Experiment Station, U.S. Army Corps of Engineers, Vicksburg,
MS.
Brinson, M. M., Hauer, F. R., Lee, L. C., Nutter, W. L., Rheinhardt, R. D., Smith, R. D., and Whigham, D.
(1995). "A guidebook for application of hydrogeomorphic assessments to riverine wetlands," Technical
Report WRP-DE-11, U.S. Army Engineer Waterways Experiment Station, Vicksburg, MS. NTIS No. AD
A308 365.
Federal Register. 2012. Nationwide Permits, Conditions, Further Information, and Definitions. Vol. 77,
No. 34 Issued Tuesday, February 21, 2012.
King County IMAP. 2015. Accessed online at: www.kingcounty.gov/operations/GIS/Maps/iMAP.aspx
Page 9
FIGURES
Figure 1. Neighborhood detail map prepared by City of Renton for inclusion with permit application.
Page 10
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Figure 2. 2009 aerial imagery of parcel (Source: King I Map. 2009.)
Figure 3. City of Renton stream class mapping showing Tran property on a class 4 stream. Source:
http ://re ntonwa ,gov/uploaded Files/Busi ness/E DN SP/pro j ects/wtrcla s s. pdf
Page 11
Figure 4. 2 foot contours in the vicinity of the Tran property. (Contour layer source is City of Renton GIS
Data available at: http://rentonwa.gov/government/defau lt.aspx?id~29887)
THAT PORTION OF Tl W 1/4 .~. SECTION _}£_TOWNSHIP -2.4 RTH, RANGE..Q.5_ EAST, WM
LY & TRAN RESIDENCE
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Parcel Number: 334210-3365
Tall Oregon Grape Bank Armoring to be
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Figure 5. Proposed Project Site plan
re!] CRONES It ASSOC. t.::l!J lAND SURVEYORS -·--.&i:-... .:.iuz.~
Page 13
Figure 6. Typical for work area isolation of the north stream bank during removal of concrete block to
protect water quality. Figure from http://www.catchmentsandcreeks.com.au/docs/lB-1.pdf
Proposed
Planting Area
Approximate
Property
Boundary
PHOTOGRAPHS
Photograph 1. Looking east from northwest corner of the Tran property along unnamed stream.
Page 14
Page 15
Photograph 2. Looking east toward dam on neighbor's property in the background.
Photograph 3. Looking northeast toward neighboring property and fence beyond line of cedar trees.
Concrete riprap has been in place along most of the stream for several decades or more.
Page 16
Appendix A
Additional Native shrub species that may be installed if replanting is required in the future
include:
Shrubs
Acer circinatum (vine maple)
Cory/us cornuta (Hazelnut)
Holodiscus discolor (Ocean spray)
Lonicera involucrota (Black twin berry)
Mahonia aquifolium (Tall Oregon grape)
Rhododendron mocrophyllum (Pacific rhododendron)
Ribes sanguineum (Red flowering currant)
Rosa pisocarpa (Clustered wild rose)
Rosa gymnocarpa /Bald hip rose)
Rubus spectabilis (Salmonberry)
Camus sericea /Red twig dogwood )
Rubus parviflorus (Thimbleberry)
Vaccinium ovatum (Evergreen huckleberry)
Low shrubs
Gau/theria shallon (Sala I)
Arctostaphylos uva-ursi (Bearberry or Kinnickinnick)
Understory herbaceous species
Polystichum munitum (swordfern)
Fragaria virginiana (wild strawberry)
Stream bank planting herbaceous species
Juncus effusus
Juncus acuminatus
Carex utriculata
Carex lenticularis var.lipocarpa
DEPARTMENT OF COMMUN
AND ECONOMIC DEVELOPMENT
DATE:
PROJECT NUMBER:
PROJECT NAME:
PROJECT MANAGER:
APPLICANT:
CONTACT:
LOCATION:
DESCRIPTION:
CRITICAL AREA:
PLANNING D
CERTIFICATE OF
FROM CRITICAL AREA
EVALUATION FORM
November 02, 2015
LUA15-000761
2816 Kennewick Stream and I
Kris Sorensen, Associate Planr
Alyssa Tran
18364 160th Pl SE
Renton, WA 98058
Kate Knox Machata, 7K Environmental
4062 NE 87th St
Seattle, WA 98115
2816 KENNEWICK Pl NE
The applicant is requesting a Critical Areas Exemption for SEPA exempt
activities for enhancement of a stream buffer at 2816 Kennewick Pl NE (PIO
334210-3365). The subject site is within the Residential 8 (R-8) zone. An
unnamed creek and a tributary of May Creek runs through the rear yard of the
single-family residential site, in an open channel, and enters a culvert at the
northeast corner of the site where the creek then continues under NE 29th St.
The creek was classified as a Class 4 stream when the new home was
constructed in 2012 and when work in the stream and buffer were conducted
without required City approvals. The proposed plant mix in the buffer consists
of Tall Oregon Grape, Red Flowering Current, Ocean Spray, Swordfern, and Wild
Strawberry. The buffer area on the both sides ofthe creek is approximately
1,300 square feet. The site is located within the Wellhead Protection Area Zone
2. Small slopes between 15 and 25 percent are located near the creek area on
the site. A stream study and mitigation plan of the restoration proposal was
submitted by a Professional Wetland Scientist, Kate Knox Machata of 7k
Environmental dated August 31, 2015 (revised September 17, 2015). This study
concludes that an increase in ecosystem function is anticipated with the
implementation of this restoration plan.
Class 4 Unnamed Stream and Stream Buffer
EXEMPTION JUSTIFICATION: Renton Critical Areas Regulations, RMC 4-3-050C.5.a.iii "Exempt Activities -
Permitted within Critical Areas and Associated Buffers" iii. Approved Restoration/Mitigation activities
Page 1 of 4
October 27, 2015
Kate Knox Machata
7K Environmental
4062 NE 37'h St
Seattle, WA 98115
SUBJECT: "On Hold" Notice
Community & Economic Development Department
C.E."Chip"Vincent, Administrator
2816 Kennewick Critical Area Exemption/ LUAlS-000761, CAE
Dear Kate Knox Machata:
The Planning Division of the City of Renton accepted the above master application with
the revised enhancement plan for review on October 12, 2015. During our review for
the subject Critical Areas Exemption request, staff has determined that additional
information is necessary in order to proceed further. Specifically, because work is
proposed within the Class 4 stream and below the Ordinary High Water Mark,
Environmental (SEPA) Review is required. An Environmental Checklist is enclosed with
this letter and is required to be filled out and submitted along with the review fee.
The checklist and fee will need to be submitted before January 26, 2016 so that we may
continue the review of the subject application and proceed with Environmental Review
and Critical Areas Exemption request.
At this time, your project has been placed "on hold" pending receipt of the requested
information. Please contact me at (425) 430-6593 if you have any questions.
Sincerely,
~~ ~.~ "'"'-
Kris Sorensen
Associate Planner
cc: Alyssa Tran and Tony Ly/ Owner/ Applicant
Enclosures
Renton City Hall • 1055 South Grady Way , Renton, Washington 98057 , rentonwa.gov
February 15, 2017
Kate Knox Machata
7K Environmental, LLC
4062 NE 87'h St.
Seattle, WA 98115
Community & Economic Development C. E. "Chip" Vincent, Administrator
SUBJECT: LUAlS-000761 2816 Kennewick Stream and Buffer Enhancement
Acceptance of Year 1 Monitoring Report
Dear Ms. Machata:
I have received the Year 1 Monitoring Report for stream buffer enhancement plantings associated
with the LUA15-000761 Critical Areas Exemption. The exemption was approved with conditions
that stated, in part; that the applicant provide a monitoring report one-year following the
installation of the plantings. Condition #2 further stated that the report provide number and types
of plantings, survival, and replacement recommendations. The report identified a successful
planting with no replacement needed. Therefore, staff finds the applicant is in compliance with
the Condition #2 of the referenced Critical Areas Exemption and no further action related to this
condition is required.
Please feel free to contact me should you have any questions regarding this letter at 425.430.6593
or mherrera@rentonwa.gov.
------------
Sin:~
Matthew Herrera, AICP
Senior Planner
cc: Alyssa Tran, 18364 160'" Pl SE, Renton, WA 98058
1055 South Grady Way, Renton, WA 98057, rentonwa.gov
CITY OF RENTO
DEPARTMENT OF COMMUNITY & ECONOMIC
DEVELOPMENT
MEMORANDUM
Date: December 8, 2016
To: City Clerk's Office
From: Sabrina Mirante
Subject: Land Use File Closeout
Please complete the following information to facilitate project closeout and indexing by the City
Clerk's Office.
Project Name:
LUA (file) Number:
Cross-References:
AKA's:
Project Manager:
Acceptance Date:
Applicant:
Owner:
Contact:
PID Number:
ERC Determination:
Administrative Decision:
Public Hearing Date:
Date Appealed to HEX:
By Whom:
HEX Decision:
Date Appealed to Council:
By Whom:
2816 Kennewick Stream and Buffer Enhancement
LUA15-000761, CAE
Kris Sorensen
October 19, 2015
Alyssa Tran
Tony Ly
Kate Knox Machata
3342103365
Date:
Appeal Period Ends:
Approved with Conditions Date: November 3, 2015
Appeal Period Ends: November 17, 2015
Date:
Appeal Period Ends:
Council Decision: Date:
Mylar Recording Number: I
Project Description: The applicant is requesting a Critical Areas Exemption for SEPA exempt i
activities for enhancement of a stream buffer at 2816 Kennewick Pl NE (PIO 334210-3365). The !
subject site is within the Residential 8 (R-8) zone. An unnamed creek and a tributary of May Creek ;
runs through the rear yard of the single-family residential site, in an open channel, and enters a !
culvert at the northeast corner of the site where the creek then continues under NE 29th St. The i
creek was classified as a Class 4 stream when the new home was constructed in 2012 and when !
work in the stream and buffer were conducted without required City approvals. The proposed plant I
mix in the buffer consists of Tall Oregon Grape, Red Flowering Current, Ocean Spray, Swordfern, [
and Wild Strawberry. The buffer area on the both sides of the creek is approximately 1,300 square I
feet. The site is located within the Wellhead Protection Area Zone 2. Small slopes between 15 and 1 25 percent are located near the creek area on the site. A stream study and mitigation plan of the i
restoration proposal was submitted by a Professional Wetland Scientist, Kate Knox Machata of 7k ,
Environmental dated August 31, 2015 (revised September 17, 2015). This study concludes that an!
increase in ecosvstem function is anticioated with the imolementation of this restoration olan. ·
"-~~:~:~a~:~:~:-~_s"":---~-----~~:~~M-~Kwe""n"'n""e .. w .. ic'"k-PI .. N_E ______ ,_J
ERC Determination Types: DNS -Determination of Non-Significance; DNS-M -Determination of
Non-Significance-Mitigated; DS -Determination of Significance.
DEPARTMENT OF COMMUNITY
AND ECONOMIC DEVELOPMENT
Planning Division
LAND USE PERMIT MASTER APPLICATION
PROPERTY OWNER(S) PROJECT INFORMATION
PROJECT OR DEVELOPMENT NAME: NAME·
Alvssa Tran and Tonv Lv Native Shrub Hedge Planting Project
ADDRESS:
2816 Kennewick Pl NE
, PROJECTIADDRESS(S)/LOCATION AND ZIP CODE:
' 2816 Kennewick Place NE, Renton WA 98056. The
planting area is along the North boundary of the
CITY: ZIP· property, north of the stream.
Renton 98056
TELEPHONE NUMBER:
205-307-187 4
KING COUNTY ASSESSOR'S ACCOUNT NUMBER(S):
Parcel# 334210-3365
PPLICANT (if other than owner)
NAME: EXISTING LAND USE(S) Residential
COMPANY {if applicable)·
PROPOSED LAND USE(S) No change
EXISTING COMPREHENSIVE PLAN MAP DESIGNATION
ADDRESS 'R-8
PROPOSED COMPREHENSIVE PLAN MAP DESIGNATION
CITY: ZIP (if applicable) No Change
TELEPHONE NUMBER: EXISTING ZONING: R-8
CONTACT PERSON ! PROPOSED ZONING (if applicable): No change
NAME: SITE AREA (in square feet) 200 square feet
Kate Knox Machala
SQUARE FOOTAGE OF PUBLIC ROADWAYS TO BE
COMPANY (if applicable)· DEDICATED: NIA
7K Environmental
SQUARE FOOTAGE OF PRIVATE ACCESS EASEMENTS:
ADDRESS·
4062 NE 87~ St NIA
PROPOSED RESIDENTIAL OENSITY IN UNITS PER NET
CITY ZIP· ! Seattle 98115
ACRE (If applicable) NIA
--
TELEPHONE NUMBER AND EMAIL ADDRESS: i NUMBER OF PROPOSED LOTS (if applicable)
NIA
i
I
i 206-683-7229 i I I a.kate.knox@gmail.com
NUMBER OF NEW DWELLING UNITS (if applicable) j
NIA ___j .~--------------·-·J
C:\Users\kate\Oocuments\03 Self-employment\tran Renton\masterapp_CDmplete_0830l5.docx
--RECEIVED -
S ': :' l i :",', ', J Rev OBl201S
CITY OF RENTON
Pt.ANNING DIVISION
PROJECT INFORMAT,-10'-N-~(,c_o_n_ti_n_ue_d_,_ll _______ ~
NUMBER OF EXISTING DWEWNG UNITS (ij applicable) PROJECT VALUE:
NIA
SQUARE FOOTAGE OF PROPOSED RESIDENTIAL
BUILDINGS (if applicable) NIA
IS THE SITE LOCATED IN ANY TYPE OF
ENVIRONMENTALLY CRITICAL AREA, PLEASE INCi.UDE
SQUARE FOOTAGE (if applicable)
SQUARE FOOTAGE OF EXISTING RESIDENTIAL
BUILDINGS TO REMAIN (if applicable) NIA
SQUARE FOOTAGE OF PROPOSED NON-RESIDENTIAL
BUILDINGS (if applicable). NIA
SQUARE FOOTAGE OF EXISTING NON-RESIDENTIAL
BUILDINGS TO REMAIN (if applicablef NIA
NET FLOOR AREA ON NON-RESIDENTIAL BUILDINGS (if
applicable)· NIA
NUMBER OF EMPLOYEES TO BE EMPLOYED BY THE NEW
PROJECT (if applicable) NIA
0 AOUIFIER PROTECTION AREA ONE
0 AOUIFIER PROTECTION AREA lWO
0 FLOOD HAZARD AREA
D GEOLOGIC HAZARD
D HABITAT CONSERVATION
D SHORELINE STREAMS & LAKES
D WETLANDS
LEGAL DESCRIPTION OF PROPERTY
(Attach leaal descrlotlon on seoarate sheet with the following information included)
__ sq.ft.
__ sqfl
__ sqft.
__ sq.ft
__ sq.fl
SITUATE IN THE §Y:l. QUARTER OF SECTION~. TOWNSHIP 24N, RANGE OSE, IN THE CITY OF
RENTON, KING COUNTY, WASHINGTON
AFFIDAVIT OF OWNERSHIP
I, (Print Name/s) ~. declare under penalty of pe1ury under the laws of the State of Washington lhat I am (please checl< one)
Ci?l the current owner of the property involved in this application or O the authorized representative to act for a corporation (please
attach proof ot authorization) and that the foregoing statements and answers herein contained and the information herewith are in all
respects true and correct to the best of my knowledge and belief,
STATE OF WASHINGTON) ) ss
COUNTY OF KING )
MIRANDA MACKEY
STATE OF WASHINGTON
NOTARY PUBLIC
MY COMMISSION EXP1RES
05-01-19
Notary (Print)
My appointment expires ~Q=_,./_1_/~l_'.:1~-----------
C:\Users\kate\Oocuments\03 Self-employment\Tran Renton\masterapp_Comple1e _083015 docx Rev: OB/201S
DEPARTMENT OF COMMUNITY
AND ECONOMIC DEVELOPMENT
SUBMITTAL REQUIREMENTS
EXEMPTION FROM CRITICAL AREAS
REGULATIONS
Planning Division
1055 South Grady Way-Renton, WA 98057
Phone: 425-430-7200 Fax: 425-430-7231
PURPOSE: To allow certain activities to intrude into a critical area or required buffer subject to the City
providing a letter of exemption of any listed conditions or requirements.
FREE CONSULTATION MEETING: Prior to submitting an application, the applicant should informally
discuss the proposed development with the Planning Division. The Planning Division will provide
assistance and detailed information on the City's requirements and standards. Applicants may also take
this opportunity to request the waiver of the City's typical application submittal requirements, which
may not be applicable to the specific proposal. For further information on this meeting, see the
instruction sheet entitled "Submittal Requirements: Pre-Application."
COMPLETE APPLICATION REQUIRED: In order to accept your application, each of the numbered items
must be submitted at the same time. If you have received a prior written waiver of a submittal item(s)
during a pre-application meeting, please provide the waiver form in lieu of any submittal item not
provided. All plans and attachments must be folded to a size not exceeding Sl'I by 11 inches.
APPLICATION SCREENING: Applicants are encouraged to bring in one copy of the application package
for informal review by staff, prior ta making the requested number of copies, colored drawings, or photo
reductions. Please allow approximately 45 minutes for application screening.
APPLICATION SUBMITTAL HOURS: Applications should be submitted to Planning Division staff at the
6th floor counter of Renton City Hall, 1055 South Grady Way, between 8:00 a.m. and 4:00 p.m. Monday
through Friday. Please call your assigned project manager to schedule an appointment or call (425) 430-
7200 to reach the Planning Division. Due to the screening time required. applications delivered by
messenger cannot be accepted.
ADDITIONAL PERMITS: Additional permits from other agencies may be required. It is the applicant's
responsibility to obtain these other approvals. Information regarding these other requirements may be
found at
All Plans and Attachments must be folded to 8 W'by 11"
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APPLICATION MATERIALS:
D 1.
N/A
[8J 2.
[8J 3.
[8J 4.
[8J 5.
[8J 6.
Pre-Application Meeting Summary: If the application was reviewed at a "pre-application
meeting", please provide 5 copies of the written summary provided to you.
Waiver Form: If you received a waiver form during or after a "pre-application meeting",
please provide 5 copies of this form.
Land Use Permit Master Application Form: Please provide the original plus 11 copies of the
COMPLETED City of Renton Planning Division's Master Application form. Application must
have notarized signatures of All current property owners listed on the litle Report. If the
property owner is a corporation, the authorized representative must attach proof of signing
authority on behalf of the corporation. The legal description of the property must be
attached to the application form.
Critical Areas EKemption Form (attached!: Please provide 3 copies of the attached Critical
Areas Exemption form if the project consists of one of the listed activities eligible for SEPA
exemption.
Neighborhood Detail Map: Please provide 12 copies of a map drawn at a scale of 1" = 100' or
1" = 200' (or other scale approved by the Planning Division) to be used to identify the site
location on public notices and to review compatibility with surrounding land uses. The map
shall identify the subject site with a much darker perimeter line than surrounding properties
and include at least two cross streets in all directions showing the location of the subject site
relative to property boundaries of surrounding parcels. The map shall also show: the
property's lot lines, lot lines of surrounding properties, boundaries of the City of Renton (if
applicable), north arrow (oriented to the top of the plan sheet), graphic scale used for the
map, and City of Renton (not King County) street names for all streets shown. Please ensure
all information fits on a single map sheet.
Kroll Map Company (206-448-6277) produces maps that may serve this purpose or you may
use the King County Assessor's maps as a base for the Neighborhood Detail Map. Additional
information (i.e. current city street names) will need to be added by the applicant.
Site Plan: Please provide 12 copies of a fully-dimensioned plan sheet drawn at a scale of
1"=20' (or other scale approved by the Planning Division). We prefer the site plan be drawn on
one sheet of paper unless the size of the site requires several plan sheets to be used. If you
are using more than a single plan sheet, please indicate connecting points on each sheet.
The Site Plan should show the following:
• Name of proposed project
• Date, scale, and north arrow (oriented to the top of the paper/plan sheet)
• Drawing of the subject property with all property lines dimensioned and names of
adjacent streets
• Widths of all adjacent streets and alleys
• Location of all existing public Improvements including, but not limited to, curbs,
gutters, sidewalks, median islands, street trees, fire hydrants, utility poles, etc., along
::.\URts\hte\Oocuments\03 Self-employment\Tran Renton\(ritareas~)lempt j1}_Compk!te_0Ul'.l1S.dor• fCev; 02/201S
the full property frontage
• Location and dimensions of existing and proposed:
1. structures
2. setbacks
3. parking, off-street loading space, curb cuts and aisle ways
4. fencing and retaining walls
5. free-standing signs and lighting fixtures
6. refuse and recycling areas
7. utility junction boxes and public utility transformers
8. storage areas and job shacks/sales trailers/model homes
Location and dimensions of all easements referenced in the title report with the
recording number and type of easement (e.g. access, sewer, etc.) indicated
Location and dimensions of natural features such as streams, lakes, required buffer
areas, open spaces, and wetlands
• Ordinary high water mark and distance to closest area of work for any project located
within 200-feet from a lake or stream
A legend/analysis of the following information MUST be included on the site plan:
• Total square footage of the site
• Square footage (by floor and overall total) for each individual building and/or use
• Total square footage of all buildings/structure footprints
• Total impervious surfacing. List the square footage of both existing impervious area to
remain plus new impervious areas to be installed, and the total square footage of
parking areas
• Percentage of lot coverage
• Square footage of all landscaping (total, interior of parking lot, and wildlife
habitat/natural areas)
Allowable and proposed building heights
• All building setbacks required by code
• Proposed building setbacks
• Square footage of any on-site critical areas
Parking analysis including the following:
1. Number of stalls required by Code (if more than one use/ratio show required
number for each use
2. Total number of stalls proposed (if less or more than total required attach a
request for a parking modification to the application package
3. Location and number of "ADA accessible" stalls, compact, employee
and/or guest parking stalls, and parking space dimensions
4. Sizes of various types of stalls proposed
5. Angle of stalls (if other than 90 degrees)
6. Location and size of curb cuts
7. Traffic flow within the parking, loading. maneuvering areas, ingress and egress
8. Location of wheel stops
9. Loading space(s) location and dimensions
10. Number of stacking space(sl for any drive-up windows
11. Location and dimensions of any bicycle racks, bus shelters, carpool parking
,:;.\\.HiH~\kate\Docume.nts\03 Self·employmer.t\Tr;m Renton\<r1tare,ne;iiert'pt (l)_ CampfetJ?_OS:1015 e:o.::1t l;!:t,' 02/2015
rgJ 7.
D 8.
N/A
D 9.
N/A
spaces, or facilities designed to accommodate access to the site.
Topography Map: Please provide 4 copies of a plan showing the site's existing contour lines at
live-foot vertical intervals.
Tree Retention/Land Clearing (Tree Inventory) Plan: Please provide 4 copies of a fully
dimensioned plan drawn by a certified arborist or a licensed landscape architect if ANY trees
or vegetation are to be removed or altered. The plan shall be based on finished grade, drawn
at the same scale as the project site plan with the northern property line at the top of the
paper, and clearly show the following:
All property boundaries and adjacent streets, location and dimensions of rights-of-
way, utility lines, fire hydrants, street lighting, and easements;
• Location of all areas proposed to be cleared;
Location, species, and sizes of trees on or immediately abutting the site. This
requirement applies only to trees with a caliper of at least six inches (6"), or an alder
or cottonwood tree with a caliper of at least eight inches (8"), when measured at fifty.
four inches (54") above grade;
• Clearly identify trees to be retained and to be removed;
Future building sites and drip lines of any trees which will overhang/ overlap a
construction line. Where the drip line of a tree overlaps an area where construction
activities will occur, this shall be indicated on the plan;
• Show critical areas and buffers.
Arborlst Report: Please provide 4 copies of an arborist report by a certified arborist or a
licensed landscape architect that correlates with the Tree Retention/ Land Clearing Plan and
addresses the following:
• Identification scheme used for each tree (e.g. tree number);
• Species and size of each tree (caliper measured at 54 inches above grade);
• Reason(s) for any tree removal (e.g. poor health, high risk of failure due to structure,
defects, unavoidable isolation (high blow down potential), unsuitability of species,
etc.) and for which no reasonable alternative action is possible (pruning, cabling, etc.);
For trees proposed to be retained, a complete description of each tree's health,
condition, and viability;
For trees proposed to be retained, a description of the method(s)used to determine
the limits of disturbance (e.g., critical root zone, root plate diameter, or a case-by-
case basis description for individual trees);
A description of the impact of necessary tree removal to the remaining trees, including
those in a grove or on abutting properties;
The suggested location and species of supplemental trees to be used when required.
The report shall include planting and maintenance specifications;
• An analysis of retained trees according to Priority of Tree Retention Requirements
specified in RMC 4-4-130H.1.b.
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D 10. Wetland Assessment: Please provide 12 copies of the map and 5 copies of the report if ANY
N/A wetlands are located on the subject property or within 100 feet of the subject property. The
wetland report/delineation must include the information specified in RMC 4-8-1200. In
addition, if any alteration to the wetland or buffer is proposed, 5 copies of a wetland
mitigation plan is also required. See RMC 4-8-1200 for plan content requirements.
[8] 11. Standard Stream or Lake Study: Please provide 12 copies of a report containing the
information specified in RMC Section 4·8·1200. In addition, if the project involves an
unclassified stream, a supplemental stream or lake study is also required (12 copies). If any
alteration to a water-body or buffer is proposed a supplemental stream or lake study (12
copies) and a mitigation plan (12 copies) are also required. See RMC 4·8·120D for plan
content requirements.
D 12. Flood Hazard Data: Please provide 12 copies of a scaled plan showing the nature, location,
N/A dimensions, and elevations of the area in question; existing or proposed structures, fill,
storage of materials, and drainage facilities. Also indicate the following:
[8] 13.
D 14.
N/A
D 15.
N/A
D 16.
N/A
• Elevation in relation to mean sea level of the lowest floor (including basement) of all
structures
• Elevation in relation to mean sea level to which any structure has been floodproofed
• Certification by a registered professional engineer or architect the floodproofing
methods criteria in RMC HU'l·l 1).SiJUH have been met
• Description of the extent to which a watercourse will be altered or relocated as a result
of proposed development
Biological Assessment/Critical Areas Study: provide 5 copies if the project is located in a
designated floodplain.
Habitat Data Report: If the project site contains or abuts a critical habitat per RMC 4.3.
OSOBSb, please provide 12 copies of a report containing the information specified in Section
4-8-1200 of the Renton Municipal Code.
Geotechnlcal Report: Please provide S copies of a study prepared and stamped by a State of
Washington licensed professional engineer including soils and slope stability analysis, boring
and test pit logs, and recommendations on slope setbacks, foundation design, retaining wall
design, material selection, and all other pertinent elements.
Letter of Understanding Geologic Risk: Please provide 5 copies of a letter from the applicant,
or the owner of the site, stating that he or she understands and accepts the risk of developing
in an unstable area and that he or she will advise, in writing, any prospective purchasers of
the site, or any prospective purchasers of structures or portions of structures on the site, of
the unstable potential of the area.
D 17. Grading Plan, Detailed: Please provide 12 copies of a 22" x 34" plan drawn by a State of
N/A Washington licensed civil engineer or landscape architect at a scale of one inch to forty feet
clearly indicating the following:
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• Graphic scale and north arrow
• Dimensions of all property lines, easements, and abutting streets
• Location and dimension of all on-site structures and the location of any structures
within 15-feet of the subject property or that may be affected by the proposed work
• Accurate existing and proposed contour lines drawn at two-foot, or less, intervals
showing existing ground and details of terrain and area drainage to include surrounding
off-site contours within 100-feet of the site
• Location of natural drainage systems, including perennial and intermittent streams and
the presence of bordering vegetation
• Setback areas and any areas not to be disturbed
• Finished contours drawn at two-foot intervals as a result of grading
• Proposed drainage channels and related construction with associated underground
storm lines sized and connections shown
• Finished floor elevatlon(s) of all structures, existing and proposed
General notes addressing the following (may be listed on a cover sheet):
• Area in square feet of the entire property
• Area of work in square feet
• Both the number of tons and cubic yards of soil to be added, removed, or relocated
• Type and location of fill origin, and destination of any soil to be removed from site
D 18. Drainage Control Plan: Please provide 4 copies of a plan drawn to scale and stamped by a
N/A Washington State licensed professional engineer and complying with the requirements of
Renton Municipal Code, Section 4-6-030 and the King County Surface Water Management
Design Manual, 2009 edition, as adopted and amended by the City of Renton.
D 19. Drainage Report: Please provide 4 copies of a report complying with the requirements of the
N/A City of Renton Drafting Standards, Section 4-6-030 of the City of Renton Municipal Code, the
King County Surface Water Design Manual (KCSWDM), 2009 edition, and the City of Renton
Amendments to the KCSWDM, Chapters 1 and 2 as adopted by the City of Renton. The report
(TIR) must be stamped and dated by a civil engineer and shall contain the following:
• Table of Contents
Technical Information Report (TIR) Worksheet
• Section 1: Project Overview
Section 2: Conditions and Requirements Summary
Section 3: Offsite Analysis
• Section 4: Flow Control and Water Quality Facility Analysis and Design
• Section 5: Conveyance System Analysis and Design
• Section 6: Special Reports and Studies
• Section 7: Other Permit
Section 8: CSWPPP Analysis and Design
Section 9: Bond Quantities, Facility Summaries, and Declaration of Covenant
Section 10: Operations and Maintenance Manual.
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0 20. Plan Reductions: Please provide one 8 W' x 11" legible reduction of each full size plan sheet
N/A (unless waived by your Project Planner). The sheets that are always needed in reduced form
are: landscape plans, conceptual utility plans, site plan or plat plan, neighborhood detail map,
topography map, tree cutting/land clearing plan, critical areas plans, grading plan, and
building elevations. The quality of these reductions must be good enough so that a photocopy
of the reduced plan sheet is also legible. If your reduced plans are not legible once
photocopied, you will need to increase the font size or try a different paper type. Illegible
reductions cannot be accepted. Once the reductions have been made, please also make one
8 W' x 11" regular photocopy of each photographic reduction sheet. Some of the local Renton
print shops that should be able to provide you with reductions of your plans are Alliance
Printing (425) 793-5474, Apperson Print Resources (425) 251-1850, and PIP Printing (425) 226·
9656. Nearby print shops are Digital Reprographics (425) 882-2600 in Bellevue, Lithe Design
(206) 574-3000 and Reprographics NW/Ford Graphics (206) 624-2040.
All Plans and Attachments must be folded to 8Yz'' by 11"
C:\U~rs\hti?\Doct.Jments\03 .Self,,empfoyment\Tran Reriton\critarea.~xempt {l)_Complete .. 083015 dOC)I Rt\i:02/201S
DEPARTMENT OF COMMUNITY
AND ECONOMIC DEVELOPMENT
CRITICAL AREAS EXEMPTION
(FOR SEPA EXEMPT ACTIVITIES)
Planning Division
1055 South Grady Way-Renton, WA 98057
Phone: 425-430-7200 Fax: 425-430-7231
Applicant Name I Project Name I Phone Number
Alyssa Tran and Tony Ly Native Shrub Hedge Planting Project 206-307-1874
Parcel Number I Project Address
334210-3365 2816 Kennewick Pl NE, Renton WA 98056
Brief Description of Project
A row of native shrubs will be planted along the north property boundary. Approximately 20 tall Oregon
grape (Mohonio aquifolium) will be installed at 3·4 foot spacing in a row that parallels the property
boundary and south of the row of cedar tree. Approximately 27 linear feet of concrete block will be
removed from the north stream bank. Sediment and erosion control measures are proposed to protect
water quality in the stream during the installation and establishment period.
Type of Critical Area I [g) Work Occurs in I [81 Work Occurs in Class 4 Stream Critical Area Buffer
PURPOSE: Exempt activities provided with a letter of exemption from the Development Services
Administrator may intrude into a critical area or required buffer (Subject to any conditions or
requirements provided by the Administrator).
APPLICABILITY OF EXEMPTIONS: The following is a general list of activities that may be exempt from the
critical areas regulations. More specific descriptions of the activities are contained in the Critical Areas
Regulations. Some of the listed activities may not be exempt in certain critical areas. The Planning
Division will evaluate you request according to the City of Renton Critical Areas Regulations in RMC 4-3-
0SOC, J, L, and N.
I AM REQUESTING A CRITICAL AREAS EXEMPTION FOR ONE OR MORE OF THE FOLLOWING ACTIVITIES:
[g] Conservation, Enhancement, and Related Activities:
• Conservation or preservation of soil, water, vegetation, fish, and other wildlife
Enhancement activities as defined in chapter 4-11 RMC D'
Any critical area, buffer restoration, or other mitigation activities that have been approved
by the City
0 Research and Site Investigation:
Nondestructive education and research
• Site investigative work necessary for land use application submittals such as surveys, soil
logs. etc.
C \Users\kau!\Documenu\03 Selremp:oyment\Tran Renton\trit,.UtH1.sexemµt U)._comp!ete_OS3015 dooc Rev 02/2015
0 Agricultural, Harvesting, and Vegetation Management:
• Harvesting wild foods
• Existing/Ongoing agricultural activities 1
• Removal of dead, terminally diseased, damaged, or dangerous ground cover or hazardous
trees which have been certified as such by a forester, registered landscape architect, or
certified arborist
0 Surface Water Alteration:
• New surface water discharges provided the discharge meets the requirements of the
Storm and Surface Water Drainage Regulations 1 2 3
New or modified regional storm water facilities 1 2 '
• Flood hazard reduction 1 3 4 6
0 Roads, Parks, Public and Private Utilities:
• Relocation of Existing Utilities out of Critical Area and Suffer
Maintenance, operation, and repair of existing parks, trails, roads, facilities, and utilities 1 2
Installation, construction, replacement, or operation of utilities, traffic control, and
walkways within existing improved right-if-way or easement 1 2
Modification of existing utilities and streets by 10% or less 1 2 5
• Management and essential tree removal for public or private utilities, roads and public
parks 1
D Wetland Disturbance, Modification, and Removal:
Any activity in small Category 3 wetlands 1 2 3 4 5
Temporary disturbances of a wetland due to construction activities that do not include
permanent filling 1 ' '•
0 Maintenance and Construction for Existing Uses and Facilities:
Remodeling, replacing, or removing existing structures 1 2
Normal and routine maintenance and repair of any existing public or private uses and
facilities where no alteration of the critical area and required buffer or additional fill
materials will be placed 1 2
Construction activity connected with an existing single family residence or garage,
provided that no portion of the new work occurs closer to the critical area or required
buffers than the existing structure and/or the developed area of the site 1 2
• Existing activities which have not been changed, expanded or altered provided they
comply with the applicable requirements of chapter 4-10 RMC 1
0 Emergency Activities:
Removal of trees or ground cover by a City department, agency, public, or private utility in
an emergency situation
• Public interest emergency use, storage, and handling of hazardous materials by
governmental organizations in an Aquifer Protection Area
ADDITIONAL PERMITS: Additional permits from other agencies may be required. It is the applicant's
responsibility to obtain these other approvals. Information regarding these other requirements may be
found at
c \lJs1m\kate\Document1\03 Self·emproyment\Tnn Fl:enton\cntarea~e>:empt (l) _comptete_oa101s docx Aev 02/201S
I, the undersigned, declare under penalty of perjury under the laws of the State of Washington, that to
the best of my knowledge the above information is true and complete.
-~;
Applicant Signature: 1 "to J Date: ___ -'-'-'--f.-"--""'---
D Exemption Granted
Jennifer Henning. Planning Director
Department of Community & Economic Development
Conditions of Approval:
'Exemption does not apply in Aquifer Protection Areas
2Exemption does not apply in Flood Hazard Areas
3Exemption does not apply In Geologic Hazard Areas
4 Exemption does not apply in Habitat Conservation Areas
5Exemption does not apply in Streams and Lakes: Class 2 to 4
6 Exemption does not apply in Wetlands
10
D Exemption Denied
Date
C \Vsers\kate\Documenti;\03 Self emptoyment\Tran Renton\crltart?,3Sexempt {1) ,CompleH!_OS3015,docx Rev 02/2015
DEPARTMENT OF COMMUNITY
AND ECONOMIC DEVELOPMENT
WAIVER OF SUBMITTAL REQUIREMENTS
FOR LAND USE APPLICATIONS
Planning Division
1055 South Grady Way-Renton, WA 98057
Phone: 425-430-7200 Fax: 425-430-7231
-LAND USE PERMIT SUBMIITAL REQUIREMENTS: WAIVED
BY:
MODIFIED
BY:
Arborist Report 4
Biological "" ----4
I Colored Maps for Display 4
[ Construction Mitigation Description HND 4
Deed of Right-of-Way Dedication ,
Density Worksheet 4
COMMENTS:
I I ,JJ
Drainage Control Plan, [<-5 -~o~~;"dJ<To;:~ II,
Drainage Report,
Elevations, Architectural JA.\io 4
Environmental Checklist 4
Existing Covenants (Recorded Copy) 1 ,No,
, , qvo1w"-s
! Existing Easements {_R_c_c_o __ r_d __ e_d_C __ o __ p_y_) 1-A-Na-,------,r----+-------+-----------------<
,_' F_·l_oo_d_H_a,_.a_rd_D_a_ta_, ________________ _f-_2_
: floor Plans , AND, ··: A
Geotethnicdl Report 2 AND 3
_ Grading Elevations & Plan, Conceptual,
, Grading Elevations & Plan, Detailed 1 I
-+-------+---~-------1 I Habitat Data Report, l:::'..,5 j i··-·---·------·-----------------~~----+------+----------------<
; ::i:~:::;;:: ~eferral
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PROJECT NAME: C nti'cc, I f\Yt&i, Ex-t#\p-f,o,.,
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LAND USE PERMIT SUBMITIAL REQUIREMENTS:
: King County Assessor's Map Indicating Site,
landscape Plan, Conceptual 4
Landscape Plan, Detailed 4
Legal Description,
Letter of Understanding of Geological Risk,
' Parking, Lot Coverage & Landscaping Analysis , : --· ------
, Plan Reductions (PMTs) .1 t·--
Post Office Approval,
WAIVED
BY:
MODIFIED
BY:
: ·------·---------··-----+----+-----+----------------;
Plat Name Reservation 4
Rehabilitation Plan 4
Screening Detail,
Shoreline Tracking Worksheet 4
: Site Plan 2AND4
Stream or Lake Study, Standard 4
Stream or Lake Study, Supplemental,
Stream or Lake Mitigation Plan 4
Street Profiles, ............. ___ .. ___ ........... .
Title Report or Plat Certificate, .,o,
Topography Map i
Traffic Study,
Tree Cutting/Land Clearing Plan,
+------;--~-----~---------,
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\fJetlands Report/Delineation ;i
Wireless:
A13plicant Ag_reement~tat_ement !.AND 3_
Inventory of Existing Sites 2 -l,ND:.
Lease Agreement Draft 2 ,,No 3
This Requirement may be waived by:
1. Property Services
2 Development Engineering Plan Review
3 Building
4 Planning
WAIVED
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2816 KENNEWICK PL NE RENTON WA 98056
Parcel Number: 334210-3365
Tall Oregon Grape Bank Armoring to be ·
at 3-4 foot spacing O ed
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HILLMANS LAKE
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VOL. 11, PG. 63
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HYO. KENNEWICK PL NE
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f'E'DcRONES & ASSOC.
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------&llli:1:11!1
DEPARTMENT OF COMMUNITY
AND ECONOMIC DEVELOPMENT
I ,I',
WAIVER OF SUBMITTAL REQUIREMENTS
FOR LAND USE APPLICATIONS
Planning Division
1055 South Grady Way-Renton, WA 98057
Phone: 425-430-7200 Fax: 425-430-7231
LAND USE PERMIT SUBMITIAL REQUIREMENTS: WAIVED
BY:
MODIFIED
BY: COMMENTS:
Arborist R_eP __ o_rt __ -_, __________________ +-----+--'--~----"S'---1!-lO-t=-.,=-=,u..""--f---lll'"'-''1-'"--P.,,,__
t--Bi_o_lo_g_ic_·a_l A_s_s_es_s_m_e_n_t_, _______________ ·-+-·----____ J.:,s _
Calculations 1
Colored Maps for Display 4
1 Construction Mitigatton Description 2 ANDJ-----,-----+------+---------------1
1
Deed of Right-of-Way Dedication ,
i Density Worksheet 4
i Drainage Control Plan,
: Drainage Report 2
: Elevations, Architectural 3 pm 4
Environmental Checklist,
Existing Covenants (Recorded Copy) 1 AND,
Existing Easements (Recorded Copy) 1 AND4
] F1ood Hazard Data 11
' Hoar Plans JANG~
Geotechnical Report 2.ANO 3
Elevations & Plan, c.rn,ceu,ud,
Habitat Data Report 4
Improvement Deferral 1
Irrigation Plan,
2e;xr,·· /Ze;i;il.iwict -----'
PROJECT NAME: cnnu. / f\Yr<t, Ex-tWtp-Aovi
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1, \:'.:"fD\Oata\Forrns-~ernpl;,te,~\Self-1,elp l-laridouts\?larn1rg\ Waivers,1bmittalfecs.docx 1ev 02/2015
WAIVED I LAND USE PERMIT SUBMITIAL REQUIREMENTS: ' BY:
: King County Assessor's Map Indicating Site,
' I andscape Plan, Conceptual,
Landscape Plan, Detailed 4
:
I BY:
. -------------···-·-·-·-·-···--·-·· ·--····-··-··-----·· ---------
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Letter of Understanding of Geological Risk,
Map of Existing Site Conditions,
Master Application Form, _____ , ___ _
Monument Cards {one per monument) 1
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Plan Reductions (PMTs) 4 r _______ j
Post Office Approval, -J
Plat Name Reservation ..
Plat Plan,
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Preapplication Meeting Summary 4
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Rehabilitation Plan ,
' Screening Detail,
' Shoreline Tracking Worksheet 4 I '---------------------------+-----+-----f-----------------1
· Site Plan 1.1,No 4
Stream or Lake Study, Standard,
Stream or Lake Study, Supplemental 4
Stream or Lake Mitigation Plan 4
Street Profiles 2
Title Report or Plat Certificate , ,,c,
I Topography Map i
'. Traffic Study,
Tree Cutting/Land Clearing Plan 4
Urban Design Regulations Analysrs 4
: Utilities Plan, Generalized 2
Wetlands Mitigation Plan, Final ,1
Wetlands Mitigation Plan, Preliminary 4
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Wetlands Report/Delineation <l
Wireless:
Appli~ant Ag_reeme~_t__~ . .t.~~-~~~~-~.t. J_'.'No J
~~~Jory 5:)f Existing Sites 2 .i.~io '.I
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WAIVED
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MODIFIED
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_ Map of _Existing Site Conditio~_s ~"~'~D~'---+----~-----+-------------------1
Map of View Area ] Mo:.
This Requirement may be waived by:
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Building
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ZONING MAP BOOK
PLANNING -TECHNICAL SERVICES
PRINTED DATE: 10/0212013
Community & Economrc Development
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Kate Knox Machata
7K Environmental
4062 NE 87'h St.
Seattle, WA 98115
Kris Sorensen
Planning Division,
Community & Economic Development
City of Renton
1055 South Grady Way
Renton, WA 98057
August 31, 2015
(Revised September 17, 2015)
RE: Buffer Enhancement Permit Application for Alyssa and Tony Tran {Parcel number 334210-
3365)
Dear Mr. Sorensen:
With this letter report, we are requesting critical areas exemption from the City of Renton for proposed
buffer enhancement work in parcel 334210-3365. Additional materials are attached to meet permit
submittal requirements as indicated on the Exemption from Critical Areas Regulations checklist.
Project Introduction
In August 2015, 7K Environmental was contracted to assist Alyssa and Tony Tran with permit
preparation for buffer enhancement plantings which will also provide visual privacy from adjacent
properties and help to limit trespass in the stream buffer adjacent to their home. This report has been
prepared to describe existing conditions on the site, discuss existing ecological functions in the stream
buffer, and provide details of the proposed stream and buffer enhancement activities along the
unnamed stream that crosses their property. This letter report is designed to serve as the Standard
Stream Study and Biological Assessment per Renton Municipal Code (RMC) 4-8-1200.
Project Site Description and Landscape Position
The Tran property (Parcel number 334210-3365) is located at 2816 Kennewick Place NE in the City of
Renton (see Figure 1 provided by City of Kent). This parcel lies approximately 600 feet east of 1-405 in
the developed urban neighborhood of Kennydale. A small, unnamed tributary of May Creek (See Figure
2) with an average ordinary high water (OHW) width of 2 feet lies near the northern edge of the Tran
Page 2
property. No wetlands were observed on the property or adjacent to the property boundary as far as
was visible from the Tran property.
The unnamed tributary has a small watershed (estimated to be about 40 acres in size) upstream from
the subject parcel. Approximately 80 feet upstream from the parcel, the stream is impounded by a 2-3
foot high concrete dam. A 24-inch diameter CMP culvert carries water west under NE 291h Street. The
stream conveys water approximately 700 feet north and west to its confluence with May Creek which
joins Lake Washington approximately one mile further north and west. May Creek is known to be a fish
bearing stream with documented presence with possible spawning for fall Chinook and coho salmon and
winter run steel head. No fish presence has been noted in the unnamed tributary on the Tran property
(SalmonScape 2015).
Site History
The Tran's purchased the subject parcel in 2011. The existing dilapidated structure was demolished in
2012, and site grading was completed to allow for construction of a new residence under the new single
family residence combination permit number CP12039. Existing uses in the vicinity of the channel prior
the new construction (See Figure 2) included a home with landscaped yard including a swimming pool,
fence, and rock terrace retaining wall which paralleled the channel, approximately 15 feet to the south.
Regulatory Framework
The regulatory framework for work along the stream and in its buffer must consider federal, state and
local level jurisdiction.
Federal Jurisdiction
As a tributary of May Creek which flows to Lake Washington, the unnamed tributary to May Creek on
the Tran property is considered a Water of the United States, and thus will be regulated under Section
404 of the Clean Water Act. The U.S. Army Corps of Engineers (ACOE) regulates work below Ordinary
High Water (OHW). Federal permits may be required for any work that occurs below OHW.
The ACOE Nationwide permit 18 allows for minor discharges as follows:
18. Minor Discharges. Minor discharges of dredged or fill material into all waters of the United
States, provided the activity meets all of the following criteria: (a) The quantity of discharged
material and the volume of area excavated do not exceed 25 cubic yards below the plane of the
ordinary high water mark or the high tide line; (b) The discharge will not cause the loss of more
than l/10-acre of waters of the United States; and (c) The discharge is not placed for the
purpose of a stream diversion. Notification: The permittee must submit a pre-construction
notification to the district engineer prior to commencing the activity if: (1) The discharge or the
volume of area excavated exceeds 10 cubic yards below the plane of the ordinary high water
mark or the high tide line, or (2) the discharge is in a special aquatic site, including wetlands.
(See general condition 31.) (Sections 10 and 404).
Page 3
If any work in the channel is proposed and is limited to streambank stabilization and has discharge
below 10 cubic yards and does not result in stream diversion, no ACOE pre-construction notification
should be needed.
State Jurisdiction
The Washington State Department of Ecology regulates water quality under Section 401of the Clean
Water Act. If the project impacts are less than (temporary or permanent impacts) Y, acre of wetland, no
individual 401 review is required. An Hydraulic Project Approval (HPA) would be required for any work
below OHW. Most construction projects or activities in or near state waters are required to obtain an
HPA from Washington Department of Fish and Wildlife (WDFW) which is designed to ensure projects
meet state conservation standards to protect fish life. Larry Fisher is the regional wildlife biologist. An
HPA application can be completed by filling out the online application form located at the website
address http://wdfw.wa.gov/licensing/hpa/.
Local Jurisdiction: City of Renton
Local code provides for protection of critical areas including streams and their buffers. Based on current
2015 code guidance, the unnamed tributary crossing the Tran property is a City of Renton Stream Class 4
(See Figure 3). Class 4 streams have buffer use restrictions for a standard width of 35 feet. Per the
code, these buffer widths assume degraded buffers with no enhancement. Code allows that narrower
buffers may be permitted under restored or improved buffers that restore and protect riparian
functions. This parcel had a previous legal alteration that occurred within the buffer decades ago in the
form of a retaining wall and fence.
Existing Conditions
The stream and its buffer at this property exhibit characteristics of a heavily urbanized its riparian
environment (see Photographs 1-3). The stream lies at the northern edge of the Tran property. The
Tran property boundary extends a minimum of 5 feet and up to approximately 13 feet north of the
stream. Adjacent land use on the parcel to the north of the channel is a residence with fenced yard. A
line of western red cedar trees parallels the property line. Vegetation in the herb and shrub layer on the
north side of the stream is sparse due to the dense canopy cover formed by the line of cedar trees (see
Photographl). Many lower branches of the cedars were cleared by the neighbor in late July or early
August 2015 which has opened up the understory to some extent along the western edge of the
properties. Vegetation on the south bank of the stream is currently maintained lawn up to a rock
terrace which effectively stabilizes the slope leading up to the home.
The stream bed lies in swale that is approximately 6 -8 feet lower than surrounding topography. A
topographic map showing 2 foot contours in the vicinity of this property is provided in Figure 4. The
stream is approximately 2 feet wide at OHW along the length of the channel on the Tran property
(approximately 80 linear feet). Along much of the stream, the banks were stabilized with reused
concrete riprap that appears to have been placed at least several decades ago. Hollow concrete blocks
were placed more recently along 27 linear feet of the northern bank of the channel. The block is
proposed to be removed and banks will be stabilized with rushes and/or sedges. The stream bed
substrate is composed of a mix of sand and gravel with some silt. Some of the gravel-sized material is
Page4
chunks of angular broken concrete. Flows are regulated by a dam on private property that is about 100
feet upstream from the Tran property. A culvert at the west edge of the property conveys water under
NE 29'" Street and off the property.
Existing Stream Buffer Functions
Intact riparian buffers provide important ecological functions that can be described as supporting
Hydrology, Biogeochemistry, Plant Community and Habitat/Fauna! Support systems (following Brinson
et al. 1993, Brinson et al. 1995, and AC Kindig 2003.). Riparian buffers in an urban environment are
commonly degraded from decades of human encroachment and provide ecological functions to varying
degrees. Hydrology functions provided by riparian buffers may include maintenance of water quality to
downstream waters including stream temperature regulation, and regulation of water quantity from
delaying or retaining precipitation and stormwater runoff. Biogeochemistry functions provided by urban
riparian buffers may include regulation of sediment and nutrient inputs to downstream waterways
through streambank stabilization and filtration of runoff from upgradient systems. Riparian buffers may
support diverse native and/or non-native plant communities. These plant communities may provide
limited habitat opportunities for aquatic species, small birds or mammals, and beneficial insects with life
history strategies that allow survival in narrow corridors within the urban environment. In this urban
corridor, the primary goals for protecting and enhancing riparian buffers are to support cleaner water,
stream temperature regulation, stream bank stabilization, and to a limited degree provide improved
habitat for aquatic species and wildlife that can survive in the urban environment.
Ecological functions provided by the riparian buffer along the unnamed tributary to May Creek are
described under existing conditions in the sections below. The next section describes the proposed
buffer restoration and enhancement activities and assesses potential for improvement in ecological
functions that may result from this work.
Hydrology Functions
Under existing conditions, the stream and its buffer provide minimal to no hydrology functions with
enhance water quality or regulating stormwater runoff. Tree canopy cover occurs only on the northern
bank of the channel. The channel is recessed within the shallow ravine and is partially shaded by these
trees during mid-summer. These trees also intercept some precipitation to help reduce storm runoff
entering the stream. The channel banks are nearly vertical with rip rap lining much of the channel on
both sides. Sediment transport may occur to the stream from bare soil below the cedar canopy. Intact
lawn grass on the southern bank reduces potential for transport of sediment to the stream from
erosion. The existing retaining walls upslope from the stream reduce precipitation runoff from the
upslope urban environment.
Bioqeochemistry Functions
Under existing conditions, the stream and its buffer provide low to moderate biogeochemistry
functioning. There is minimal vegetation in contact with the stream during normal flows due to riprap
along steep channel banks. The plant community is maintained lawn to the south and bare herb layer
on the north and thus there is minimal potential for nutrient uptake and transformations in the riparian
buffer.
Page 5
Plant Community Functions
The cedar trees paralleling the property line are a native tree species. The rest of the riparian buffer is
dominated by non-native, predominantly herbaceous species including weeds, lawn grasses, and
horticultural plants. The northern bank has only sparse vegetation in the understory. Under existing
conditions, the stream and its buffer provide low to moderate plant community functions. The cedar
tree canopy to the north of the stream provides a slight potential for insect and litterfall input to the
creek that could support downstream aquatic food web cycling.
Fauna/ Support/Habitat Functions
Minimal to no native fauna I support or habitat functions are provided within the stream or its riparian
buffer under its existing conditions. No fish are known to occur within this small, 2-foot wide, unnamed
tributary. There is little habitat structure within the channel due to the straight, rip rap lined bank. The
sparse understory plant community and adjacent developed areas limit potential species that could
utilize this habitat. However, ducks and deer have been seen in this riparian corridor (A. Tran, Pers.
Comm. 2015).
Proposed Project
Planting Plan
The proposed planting plan is provided in Figure 5. A row of native plants will be installed along the
north property boundary to provide dual function of designed visual privacy and limiting trespass and
restoring native plant community functions. The row of tall Oregon grape (Mahonia aquifolium) will be
planted at 3-foot spacing in a row that parallels the property boundary and south of the row of cedar
trees per Figure S. The proposed planting area occupies approximately 110 square feet in the stream
buffer.
Removal of Concrete Block
Approximately 27 linear feet of vertical concrete block will be removed from the north bank of the
channel. This stream bank in this area will be restored to soft banks and stabilized with native rushes
(Juncus effusus, Juncus acuminatus) and/or native sedges (Carex utriculata, Carex lenticularis var.
lipocarpa).
Construction Sediment and Erosion Control Measures
Construction best management practices will be used during plant installation to prevent discharge of
sediment to the stream. Mulch will be applied at the base each shrub as needed. Fertilizers should not
be used given proximity to the stream. In-stream work to remove the bank armoring block will be done
using work area isolation to minimize sediment disturbance. A typical for work area isolation is shown
in Figure 6.
Page 6
Analysis of Project Effects
The scale of the proposed planting project is very small and thus potential lift for ecosystem functions is
limited. The proposed project will provide minor, incremental positive impact to ecosystem functioning
in the riparian buffer.
Hydrology Functions
Increasing shrub canopy cover in the riparian buffer will provide incremental benefits to regulation of
stream temperatures along this 80 foot long reach of the stream. However, as the proposed planting is
on the north side of the channel, minimal additional shading will be provided. Some of the shrubs may
overhang the channel as they grow larger. Additional vegetation and development of shrub and herb
canopy layers below the tree layer will intercept additional precipitation during storm events. Removal
of the concrete block and restoration of herbaceous vegetation on the stream bank may provide minor
reduction in stream velocity to delay stormwater relative to current condition with the concrete block.
The proposed project will result in minor and incremental increase in hydrology functions in the stream
and its buffer.
Bioqeochemistry Functions
Increasing plant cover and diversifying the plant community throughout the riparian buffer will
incrementally improve biogeochemical cycling opportunities in this short reach along the stream.
Restoring the channel bank to soil with native herbaceous vegetation for bank stabilization will provide
minor opportunity for nutrient retention along the channel. Due to the small area and single native
shrub species proposed, minimal changes to biogeochemical functioning in the buffer will be realized
from the proposed project.
Plant Community Functions
The proposed project will incrementally increase the native plant diversity within a portion of the buffer
by developing an understory shrub canopy cover below the cedar trees. This shrub canopy cover may
provide greater shade cover over the stream that could help to regulate stream temperatures.
Installing the row of native plants in the buffer is designed to limit human access to the stream and area
immediately adjacent to the stream. The proposed project will haye a minor and incremental increase
in plant community functions in the stream buffer.
Fauna/ Support/Habitat Functions
Although only a very small incremental increase in native plant diversity is proposed, increased diversity
in native plant community will incrementally increase the opportunities for foraging birds and beneficial
insects. There are limited opportunities for improving faunal support functions due to the heavily urban
environment in the surrounding landscape. Due to the scale of this project there will be little to no
change in faunal support/habitat functions due to the proposed planting project.
Recommended Project Conditions
No pesticides or fertilizers shall be used north of the fence or rock retaining wall. Grass north of
the rock wall should be left to grow and should not be mowed.
Page 7
If shrubs die, replant in place with the same species or alternate native species from the list in
Appendix A.
Conclusions
In conclusion, the proposed project includes planting shrubs and herbs along approximately 80 linear
feet of riparian buffer for an unnamed tributary of May Creek. Approximately 20 native shrubs [tall
Oregon grape (Mohonia aquifolium)] will be installed in the riparian buffer covering approximately 110
square feet. Bank armoring will be removed from a section of the stream. Sediment and erosion
control measures are proposed to protect water quality in the stream during the installation and
establishment period. The proposed project will provide minor incremental lift in ecosystem functions
along this short reach of stream.
We are happy to discuss the proposed project in further detail. Please contact the homeowner Alyssa
Tran at 206-307-1874 and/or Kate Knox Machala at 206-683-7229 or via email at
a.kate.knox@gmail.com if additional information is needed.
Sincerely,
Kate Knox Machata, M.S.
Professional Wetland Scientist #2104
7K Environmental
Page 8
References
AC Kindig & Company and Cedarock Consultants. 2003. City of Renton Best Available Science Literature
Review and Stream Buffer Recommendations. Prepared for the City of Renton dated February 27, 2003.
Brinson, M.M. 1993. A hydrogeomorphic classification for wetlands. Wetlands Research Program
Technical Report WRP-DE-4. Waterways Experiment Station, U.S. Army Corps of Engineers, Vicksburg,
MS.
Brinson, M. M., Hauer, F. R., Lee, L. C., Nutter, W. L., Rheinhardt, R. D., Smith, R. D., and Whigham, D.
(1995). "A guidebook for application of hydrogeomorphic assessments to riverine wetlands," Technical
Report WRP-DE-11, U.S. Army Engineer Waterways Experiment Station, Vicksburg, MS. NTIS No. AD
A308 365.
Federal Register. 2012. Nationwide Permits, Conditions, Further Information, and Definitions. Vol. 77,
No. 34 Issued Tuesday, February 21, 2012.
King County IMAP. 2015. Accessed online at: www.kingcounty.gov/operations/GIS/Maps/iMAP.aspx
Page 9
FIGURES
Figure 1. Neighborhood detail map prepared by City of Renton for inclusion with permit application.
Page 10
Stream
Figure 2. 2009 aerial imagery of parcel (Source: King I Map. 2009.)
Figure 3. City of Renton stream class mapping showing Tran property on a class 4 stream. Source:
http ://ren to nw a .gov/uploaded Files/Busi n ess/E DN SP /projects/wt re I ass. pdf
Page 11
Figure 4. 2 foot contours in the vicinity of the Tran property. (Contour layer source is City of Renton GIS
Data available at: http://rentonwa.gov/govern ment/defau lt.aspx?id=29887)
THAT PORTION OF Tl N 1 /4 , ~. SECTION -2£_ TOWNSHIP _24 Rrn RANGE _Q5._ EAST, WM.
I
NORTH
FIRE /
HYO.
1-
(J)
I
I
I
LY & TRAN RESIDENCE
2816 KENNEWICK PL NE RENTON WA 98056
Parcel Number: 334210-3365
Tall Oregon Grape Bank Armoring to be
at 3-4 foot s~ac1ng removed ,
/, · 87.61 ~
1f l :'~ ' ,!,,"""':"" .. . . .. ... ... ,:.,;;'.~ t
I ROCK TER~CE--------_J_ __ 1
FENCE
(These dimensions are appx,
measurements on Land Survey.)
17' /
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I
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2: I
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RESIDENCE AREA
I
L----~--_JI
I I t'f------~:§o·----+.,: ;,
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HYO.I KENNEWICK PL NE
Figure 5. Proposed Project Site plan
LEGAL QESCRIPIION·
HILLMANS LAKE
GARDEN OF EDEN #1
PART OF LOT 51
VOL 11, PG, 63
f'ITTcRONES & ASSOC, lJ!I WlD SURVEYORf \-•--H-.. .:=.?.ai~ ...
Page 13
Figure 6. Typical for work area isolation of the north stream bank during removal of concrete block to
protect water quality. Figure from http://www.catchmentsandcreeks.com.au/docs/lB-1.pdf
Proposed
Planting Area
Approximate
Property
Boundary
PHOTOGRAPHS
Photograph 1. Looking east from northwest corner of the Tran property along unnamed stream.
Page 14
Page 15
Photograph 2. Looking east toward dam on neighbor's property in the background.
Photograph 3. Looking northeast toward neighboring property and fence beyond line of cedar trees.
Concrete riprap has been in place along most of the stream for several decades or more.
Page 16
Appendix A
Additional Native shrub species that may be installed if replanting is required in the future
include:
Shrubs
Acer circinatum (vine maple)
Cory/us cornuta (Hazelnut)
Holodiscus discolor (Oceanspray)
Lonicero involucrata (Black twin berry)
Mahonia aquifolium (Tall Oregon grape)
Rhododendron macrophyllum (Pacific rhododendron)
Ribes sanguineum (Red flowering currant)
Rosa pisocarpa (Clustered wild rose)
Rosa gymnocarpa (Bald hip rose)
Rubus spectabilis (Salmonberry)
Camus sericea /Red twig dogwood )
Rubus parviflorus (Thimbleberry)
Vaccinium ovatum (Evergreen huckleberry)
Low shrubs
Gaultheria shallon (Salal)
Arctostaphylos uva-ursi (Bearberry or Kinnickinnick)
Understory herbaceous species,
Polystichum munitum (swordfern)
Fragaria virginiana (wild strawberry)
Stream bank planting herbaceous species
Juncus effusus
Juncus acuminatus
Carex utriculata
Carex lenticularis var.lipocarpa