HomeMy WebLinkAboutD_ERC Report_Thunder Hills_181217.pdf
DEPARTMENT OF COMMUNITY
AND ECONOMIC DEVELOPMENT
SIGNATURES:
Gregg Zimmerman, Administrator Date Rick M. Marshall, Administrator Date
Public Works Department Renton Regional Fire Authority
Kelly Beymer, Administrator Date C.E. Vincent, Administrator Date
Community Services Department Department Of Community & Economic Development
ENVIRONMENTAL (SEPA) DETERMINATION OF
NON-SIGNIFICANCE - MITIGATED (DNS-M)
PROJECT NUMBER: LUA18-000678, ECF
APPLICANT: Dave Christensen, City of Renton - Wastewater Utility /
Dchristensen@Rentonwa.gov / 1055 S Grady Way, Renton, WA 98057
PROJECT NAME: Thunder Hills Sewer Interceptor Rehabilitation
PROJECT DESCRIPTION: The applicant is requesting Environmental (SEPA) Review for improvements to
approximately 2,050 lineal feet of sewer main. The sewer line would be improved through a mix of parallel HDPE pipelines and
rehabilitation of the existing line using a cured-in-place lining technology. In addition, improvements are proposed to the 37,574
square foot maintenance access road and slope stability measures are proposed to alleviate erosion in the future. The project
site includes Thunder Hills Creek, a type Np stream with a 75-foot buffer, and seven tributary streams, all classified as Type Ns
streams with 50-foot buffers. There are six wetlands (Wetlands A-F). Of the six wetlands, four (Wetlands B, D, E, and F) would
have a standard buffer of 100 feet, Wetland A would have a standard buffer of 75 feet, and Wetland C would have a standard
buffer of 50 feet. The proposal would include 20,703 square feet of temporary wetland and stream buffer impacts, 1,332 square
feet of wetland impacts (Wetland E and F), and 41,000 permanent buffer impacts including the removal of 36 trees. The project
site includes RM-F and R-8 zoning designations. Access to the site would be provided via a gated entrance off of Grant Ave S
and S 18th St as well as an existing entrance at the cleared PSE easement access along S 18th St.
PROJECT LOCATION: Gated entrance at Grant Ave S and S 18th St and runs the length of Thunder Hills
Creek North just up to before it goes under I-405
LEAD AGENCY: City of Renton
Environmental Review Committee
Department of Community & Economic Development
The City of Renton Environmental Review Committee has determined that it does not have a probable significant adverse
impact on the environment. An Environmental Impact Statement (EIS) is not required under RCW 43.21C.030(2)(c).
Conditions were imposed as mitigation measures by the Environmental Review Committee under their authority of
Section 4-9-070D Renton Municipal Code. These conditions are necessary to mitigate environmental impacts identified
during the environmental review process. Because other agencies of jurisdiction may be involved, the lead agency will not
act on this proposal for fourteen (14) days.
Appeals of the environmental determination must be filed in writing on or before 5:00 p.m. on January 4, 2019. Appeals
must be filed in writing together with the required fee with: Hearing Examiner, City of Renton, 1055 South Grady Way,
Renton, WA 98057. Appeals to the Examiner are governed by RMC 4-8-110 and more information may be obtained from
the Renton City Clerk’s Office, (425) 430-6510.
PUBLICATION DATE: December 21, 2018
DATE OF DECISION: December 17, 2018
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12/17/2018 | 2:58 PM PST12/17/2018 | 3:21 PM PST
12/17/2018 | 2:54 PM PST
DEPARTMENT OF COMMUNITY
AND ECONOMIC DEVELOPMENT
Project Location Map
SR_ERC Report_Thunder Hills_181217
ENVIRONMENTAL REVIEW COMMITTEE REPORT
ERC Meeting Date: December 17, 2018
Project File Number: PR18-000551
Project Name: Thunder Hills Sewer Interceptor Rehabilitation
Land Use File Number: LUA18-000678, ECF
Project Manager: Jill Ding, Senior Planner
Owner: Various, see Exhibit 6
Applicant/Contact: Dave Christensen, City of Renton, 1055 S Grady Way, 6th Floor, Renton, WA
98057
Project Location: Gated site entrance at Grant Ave S and S 18th Street and runs the length of
Thunder Hills Creek north just up to before it goes under I-405.
Project Summary: The applicant is requesting Environmental (SEPA) Review for improvements to
approximately 2,050 lineal feet of sewer main. The sewer line would be improved
through a mix of parallel HDPE pipelines and rehabilitation of the existing line
using a cured-in-place lining technology. In addition, improvements are proposed
to the 37,574 square foot maintenance access road and slope stability measures
are proposed to alleviate erosion in the future. The project site includes Thunder
Hills Creek, a type Np stream with a 75-foot buffer, and seven tributary streams,
all classified as Type Ns streams with 50-foot buffers. There are six wetlands
(Wetlands A-F). Of the six wetlands, four (Wetlands B, D, E, and F) would have a
standard buffer of 100 feet, Wetland A would have a standard buffer of 75 feet,
and Wetland C would have a standard buffer of 50 feet. The proposal would
include 20,703 square feet of temporary wetland and stream buffer impacts,
1,332 square feet of wetland impacts (Wetland E and F), and 41,000 permanent
buffer impacts including the removal of 36 trees. The project site includes RM-F
and R-8 zoning designations. Access to the site would be provided via a gated
entrance off of Grant Ave S and S 18th St as well as an existing entrance at the
cleared PSE easement access along S 18th St.
Exist. Bldg. Area SF: N/A Proposed New Bldg. Area (footprint):
Proposed New Bldg. Area (gross):
N/A
N/A
Site Area: 95,121 sq. ft. Total Building Area GSF: N/A
STAFF
RECOMMENDATION:
Staff Recommends that the Environmental Review Committee issue a
Determination of Non-Significance - Mitigated (DNS-M).
DocuSign Envelope ID: B8D5474C-3764-4AAB-9F39-921E42EA7ABF
City of Renton Department of Community & Economic Development
Thunder Hills Sewer Interceptor Rehabilitation
Staff Report to the Environmental Review Committee
LUA18-000678, ECF
Report of December 17, 2018 Page 2 of 5
SR_ERC Report_Thunder Hills_181217
ENVIRONMENTAL REVIEW
In compliance with RCW 43.21C.240, the following environmental (SEPA) review addresses only those project
impacts that are not adequately addressed under existing development standards and environmental regulations.
A. Environmental Threshold Recommendation
Based on analysis of probable impacts from the proposal, staff recommends that the Responsible Officials:
Issue a DNS-M with a 14-day Appeal Period.
B. Mitigation Measures
1. Project construction shall comply with the recommendations outlined in the Geotechnical Report,
prepared by Stantec, dated February 13, 2015.
C. Exhibits
Exhibit 1: Environmental Review Committee (ERC) Report
Exhibit 2: Geotechnical Report, prepared by Stantec, dated February 13, 2015
Exhibit 3: Critical Areas Report, prepared by The Watershed Company, dated April 2018
Exhibit 4: Drainage Review Memo, prepared by Stantec, dated October 2, 2018
Exhibit 5: Civil Construction Plans
Exhibit 6: Thunder Hills PID List and Addresses
Exhibit 7: Advisory Notes
D. Environmental Impacts
The Proposal was circulated and reviewed by various City Departments and Divisions to determine whether the
applicant has adequately identified and addressed environmental impacts anticipated to occur in conjunction with
the proposed development. Staff reviewers have identified that the proposal is likely to have the following probable
impacts:
1. Earth
Impacts: A Geotechnical Report, prepared by Stantec, dated February 13, 2015 (Exhibit 2) was submitted
with the project application materials. Subsurface explorations were conducted and included four (4)
hollow stem auger borings that extended 5 to 25 feet below existing grade. Disturbed soil samples were
obtained by using a 140-pound hammer free falling a vertical distance of 30 inches for the borings. Within
Boring B-1 approximately 6 inches of topsoil and vegetation were encountered underlain by
approximately 5 feet of medium dense to dense, silty-fine to medium grained sand with variable amounts
of gravel and debris (fill). This layer was underlain by stiff to very stiff silt with variable amounts of sand
and woody debris (fill). The silt layer was underlain by stiff silt with variable amounts of sand, gravel, and
trace amounts of woody debris (Highly Weathered Renton Formation). These materials were underlain
by medium dense, silty-sand with clasts of weathered sandstone (Weathered Renton Formation), which
continued to the termination depth of the boring.
In Borings B-2 and B-3, approximately 10 to 12 inches of vegetation and topsoil were encountered,
underlain by approximately 5 feet of medium dense, silty-fine to medium grained sand with variable
amounts of gravel (fill). This layer was underlain by dense to very dense, silty-fine to medium grained sand
with variable amounts of gravel (Glacial Till), which continued to the termination depths of the borings.
DocuSign Envelope ID: B8D5474C-3764-4AAB-9F39-921E42EA7ABF
City of Renton Department of Community & Economic Development
Thunder Hills Sewer Interceptor Rehabilitation
Staff Report to the Environmental Review Committee
LUA18-000678, ECF
Report of December 17, 2018 Page 3 of 5
SR_ERC Report_Thunder Hills_181217
In Boring B-4 approximately 8 inches of angular rock was encountered, underlain by approximately 4 feet
of loose to medium dense, silty-fine to medium grained sand with variable amounts of gravel (fill). This
layer was underlain by hard sandstone (Renton Formation), which continued to the termination depth of
the boring.
Groundwater was encountered in Boring B-4 at approximately 4.5 feet below grade. Groundwater was
not encountered in any other boring locations.
The Geotechnical Report (Exhibit 2) included recommendations to reduce the potential for landslide
activity in the future. The recommended measures included gravity retaining walls or rock buttresses
between the access roadway and stream as well as in the vicinity of Station 4+70 to 5+40 to support the
access roadway. The report mentions that some walls may be over 8 feet in height, which would exceed
the maximum permitted retaining wall height of 6 feet within residential zones. Any proposal to exceed
the maximum 6-foot height for retaining walls would require a modification (see RMC 4-9-250D).
According to the applicant the majority of the work in and adjacent to protected slopes would occur within
the existing maintenance access road corridor, with the addition of some slope stabilization measures as
discussed above. The work proposed would qualify as an exemption to the Critical Areas Regulations, as
the work proposed is not anticipated to result in an expansion of the maintenance access road corridor
by more than 10 percent, see RMC 4-3-050C.3.
Based on the work proposed and the potential impacts to sensitive and protected slope areas in Proximity
to Thunder Hills Creek and other stream and wetland areas, staff recommends as a SEPA mitigation
measure that project construction be required to comply with the recommendations outlined in the
Geotechnical Report, prepared by Stantec, dated February 13, 2015.
Mitigation Measures: Project construction shall comply with the recommendations outlined in the
Geotechnical Report, prepared by Stantec, dated February 13, 2015
Nexus: SEPA Environmental Regulations.
2. Water
a. Wetlands and Streams
Impacts: The applicant submitted a Critical Areas Report, prepared by The Watershed Company,
dated April 2018 (Exhibit 3). Thunder Hills Creek, which is classified as a Type Np stream with a
standard buffer of 75 feet flows through the project site. In addition, there are 7 tributaries to Thunder
Hills Creek within the project area, all have been classified as Type Ns streams with standard buffers
of 50 feet.
Six wetlands (Wetlands A-F) have been classified and delineated on the project site. Wetlands A, B,
and D-F have been classified as Category III wetlands, Wetland C has been classified as a Category IV
wetland. Due to a lower habitat score, Wetland A would have a standard buffer of 75 feet, Wetlands
B and D-F have higher habitat scores and would have standard 100-foot buffers and Wetland C would
have a standard 50-foot buffer.
The existing Thunder Hills sewer interceptor and maintenance road are located parallel to Thunder
Hills creek and are within wetland, stream, and associated buffer areas. Construction associated with
the proposed sewer interceptor rehabilitation will result in some disturbance to streams, wetlands,
and their associated buffers. Impacts from proposed project activities include temporary impacts from
construction, direct wetland impacts from access road improvements, and impacts to the combined
wetland/stream buffers from access. The sewer interceptor rehabilitation work itself does not include
in-water work and would not result in adverse stream impacts.
Temporary combined wetland and stream buffer impacts will occur adjacent to the access roads
throughout the project area, for a total of 20,703 square feet. Direct wetland impacts include
DocuSign Envelope ID: B8D5474C-3764-4AAB-9F39-921E42EA7ABF
City of Renton Department of Community & Economic Development
Thunder Hills Sewer Interceptor Rehabilitation
Staff Report to the Environmental Review Committee
LUA18-000678, ECF
Report of December 17, 2018 Page 4 of 5
SR_ERC Report_Thunder Hills_181217
placement of a gravel access road within Wetland F, and construction of a new gravel turnaround that
extends partially into Wetland E at the southernmost extent of the project area. These direct wetland
impacts total 1,332 square feet. Permanent wetland and stream buffer impacts would occur as a result
of the improvements to the maintenance access road.
To reduced and mitigate for impacts to streams, wetlands, and associated buffer areas CIPP
technologies will be used, where the sewer line crosses the stream, for sewer rehabilitation in order
to ensure no direct stream impacts. Temporary impacts would be mitigated on-site. Permanent buffer
impacts will be mitigated on-site at a one-to-one ratio (for a total of 42,945 square feet) through
buffer enhancement, while permanent wetland impacts will be mitigated through purchase of credits
from the City of Renton’s Springbrook Creek mitigation bank. Additionally, large wood would be
installed in the creek bed to enhance fish habitat should fish use be restored in the future. It is
anticipated that all impacts to wetlands, streams, and associated buffer areas would be addressed
and mitigated through the City’s adopted Critical Areas Regulations (RMC 4-3-050) and would be
reviewed through the Construction Permit process; therefore no further mitigation is recommended
at this time.
Mitigation Measures: None recommended.
Nexus: N/A
b. Storm Water
Impacts: The applicant submitted a Drainage Review Memo, prepared by Stantec, dated October 2,
2018 (Exhibit 4). The project is vested to the requirements of the 2009 King County Surface Water
Design Manual, as a complete Construction Permit application was submitted prior to the adoption
of the 2017 City of Renton Surface Water Design Manual. The memo concludes that the activities
proposed would meet the definition of maintenance under the 2009 King County Surface Water
Design Manual and would therefore be exempt from drainage review.
Mitigation Measures: None recommended.
Nexus: N/A
3. Vegetation
Impacts: Vegetation would be removed from the improved maintenance access road/trail areas, at the
turnaround areas, and along the maintenance access road. Most of the vegetation to be removed consists
of ivy, blackberries, ferns, salal, grasses and other shrubs. Additionally, 40 trees, that are located directly
in grading or maintenance access path areas are proposed to be removed. Approximately 0.9 acres of
vegetation will be removed throughout the project area. However, temporary and permanent impacts to
wetland and stream buffers will be mitigated on site and would include the planting of various native
groundcover, shrubs, and 124 trees, resulting in approximately 42,945 sf of buffer mitigation through
vegetation re-planting.
Mitigation Measures: No further mitigation is recommended.
Nexus: N/A
E. Comments of Reviewing Departments
The proposal has been circulated to City Department and Division Reviewers. Where applicable, their comments
have been incorporated into the text of this report and/or “Advisory Notes to Applicant.”
Copies of all Review Comments are contained in the Official File and may be attached to this report.
The Environmental Determination 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).
DocuSign Envelope ID: B8D5474C-3764-4AAB-9F39-921E42EA7ABF
City of Renton Department of Community & Economic Development
Thunder Hills Sewer Interceptor Rehabilitation
Staff Report to the Environmental Review Committee
LUA18-000678, ECF
Report of December 17, 2018 Page 5 of 5
SR_ERC Report_Thunder Hills_181217
Environmental Determination Appeal Process: Appeals of the environmental determination must be filed in writing
together with the required fee to: Hearing Examiner, City of Renton, 1055 South Grady Way, Renton, WA 98057, on
or before 5:00 p.m. on January 4, 2019. RMC 4-8-110 governs appeals to the Hearing Examiner and additional
information regarding the appeal process may be obtained from the City Clerk’s Office, Renton City Hall – 7th Floor,
(425) 430-6510.
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CITY OF RENTON
DEPARTMENT OF COMMUNITY AND ECONOMIC DEVELOPMENT
STAFF REPORT TO THE ENVIRONMENTAL REVIEW COMMITTEE
EXHIBITS
Project Name:
Thunder Hills Sewer Interceptor
Rehabilitation
Land Use File Number:
LUA18-000678, ECF
Date of Meeting
December 17, 2018
Staff Contact
Jill Ding
Senior Planner
Project Contact/Applicant
Dave Christensen
City of Renton
1055 S Grady Way, 6th Floor,
Renton, WA 98057
Project Location
Gated site entrance at Grant Ave S
and S 18th Street and runs the
length of Thunder Hills Creek
north just up to before it goes
under I-405.
The following exhibits are included with the ERC Report:
Exhibit 1: Environmental Review Committee (ERC) Report
Exhibit 2: Geotechnical Report, prepared by Stantec, dated February 13, 2015
Exhibit 3: Critical Areas Report, prepared by The Watershed Company, dated April 2018
Exhibit 4: Drainage Review Memo, prepared by Stantec, dated October 2, 2018
Exhibit 5: Civil Construction Plans
Exhibit 6: Thunder Hills PID List and Addresses
Exhibit 7: Advisory Notes
DocuSign Envelope ID: B8D5474C-3764-4AAB-9F39-921E42EA7ABF
CITY OF RENTON
Technical Memorandum No. 4
Geotechnical Investigation
Thunder Hills Sewer Interceptor
February 13, 2015
Prepared By:
Phil A. Haberman, P.G., P.E.G.
Senior Engineering Geologist
Gopal A. Singam, P.E.
Senior Geotechnical Engineer
Stantec Consulting Services Inc.
11130 NE 33rd Place
Suite 200
Bellevue, WA 98004
425.869.9448
RECEIVED
11/15/2018 jding
PLANNING DIVISION
EXHIBIT 2
Entire DocumentAvailable in
Laserfiche
Submittals Folder
DocuSign Envelope ID: B8D5474C-3764-4AAB-9F39-921E42EA7ABF
C RITICAL A REAS R EPORT
THUNDER HILLS SANITARY SEWER LINE – RENTON, WA
Prepared for:
Stantec Consulting Services Inc.
11130 NE 33rd Place
Suite 200
Bellevue, WA 98004
Prepared by:
April 2018
RECEIVED
11/15/2018 jding
PLANNING DIVISION
EXHIBIT 3
Entire Document
Available in
Laserfiche
Submittals Folder
DocuSign Envelope ID: B8D5474C-3764-4AAB-9F39-921E42EA7ABF
RECEIVED
11/15/2018 jding
PLANNING DIVISION
EXHIBIT 4
DocuSign Envelope ID: B8D5474C-3764-4AAB-9F39-921E42EA7ABF
DocuSign Envelope ID: B8D5474C-3764-4AAB-9F39-921E42EA7ABF
VICINITY MAPCITY OF RENTONNTSEXACT SIZE, TYPE, LOCATION OR DEPTH.BURIED UTILITIES IN AREACALL BEFORE YOU DIGEXISTING UTILITIES SHOWN ARE FROMTHE BEST AVAILABLE INFORMATION ANDNO GUARANTEE IS MADE AS TO THE 1-800-424-5555RECEIVED11/15/2018 jdingPLANNING DIVISIONEXHIBIT 5Entire DocumentAvailable in Laserfiche Submittals FolderDocuSign Envelope ID: B8D5474C-3764-4AAB-9F39-921E42EA7ABF
Property Owners and Addresses
Puget Sound Energy
P.O. Box 97034
Bellevue, WA 98009
Phone: 425‐456‐2575
Woodcliffe Apartments c/o Thomson Reuters
2235 Faraday Avenue Suite #0
Carlsbad, CA 92088
760‐603‐1660
Berkshire Seattle Apartments, LLC
C/O MIG Real Estate LLC
660 Newport Center Drive #1300
Newport Beach, CA 92660
Phone: 949‐474‐5800
Regency Woods Apartments
1200 S 18th St
Renton, WA 98055
King County Assessor’s Account Numbers:
0007200048, 0007200192, 2023059005, 2023059010, 2023059012, 2023059013, 2023059050,
2023059070, 2023059084, 2023059088, 2023059111, 2023059112, 2023059113, 2023059114,
2023059116, 2023059155, 8644120000
RECEIVED
11/15/2018 jding
PLANNING DIVISION
EXHIBIT 6
DocuSign Envelope ID: B8D5474C-3764-4AAB-9F39-921E42EA7ABF
DEPARTMENT OF COMMUNITY
AND ECONOMIC DEVELOPMENT
Page 1 of 2 LUA18-000678
ADVISORY NOTES TO APPLICANT
The following notes are supplemental information provided in conjunction with the administrative land use
action. Because these notes are provided as information only, they are not subject to the appeal process for
the land use action.
Planning:
(Contact: Name, 425-430-6598, jding@rentonwa.gov)
1. RMC section 4-4-030.C.2 limits haul hours between 8:30 am to 3:30 pm, Monday through Friday unless
otherwise approved by the Development Services Division.
2. Commercial, multi-family, new single family and other nonresidential construction activities shall be
restricted to the hours between seven o’clock (7:00) a.m. and eight o’clock (8:00) p.m., Monday through
Friday. Work on Saturdays shall be restricted to the hours between nine o’clock (9:00) a.m. and eight
o’clock (8:00) p.m. No work shall be permitted on Sundays.
3. Within thirty (30) days of completion of grading work, the applicant shall hydroseed or plant an
appropriate ground cover over any portion of the site that is graded or cleared of vegetation and where
no further construction work will occur within ninety (90) days. Alternative measures such as mulch,
sodding, or plastic covering as specified in the current King County Surface Water Management Design
Manual as adopted by the City of Renton may be proposed between the dates of November 1st and
March 31st of each year. The Development Services Division’s approval of this work is required prior to
final inspection and approval of the permit.
4. A National Permit Discharge Elimination System (NPDES) permit is required when more than one acre is
being cleared.
5. The applicant will be required to submit a Final Stream Mitigation Report and Maintenance and
Monitoring proposal. In addition, the applicant will be required to comply with all the code requirements
of RMC 4-3-050 Critical Areas. This includes, but is not limited to, providing the City with a site
restoration surety device and, later, a maintenance and monitoring surety device.
6. The applicant may not fill, excavate, stack or store any equipment, dispose of any materials, supplies or
fluids, operate any equipment, install impervious surfaces, or compact the earth in any way within the
area defined by the drip line of any tree to be retained.
7. Retaining walls over 4 feet in height require a building permit. Any retaining walls proposed over 6 feet
in height require the approval of a Modification in accordance with RMC 4-9-250D.
8. This permit is shall comply with the Bald and Golden Eagle Protection Act. The permitted is responsible
for adhering to the U.S. Fish and Wildlife Service National Bald Eagle Management Guidelines (2007) and
/or your U.S. Fish and Wildlife Service permit.
Development Engineering:
(Contact: Name, 425-430-7382, afowler@rentonwa.gov)
1. See Attached Development Engineering Memo dated December 7, 2018
Fire Authority:
(Contact: Corey Thomas, 425-430-7024, cthomas@rentonwa.gov)
1. None
Technical Services:
(Contact: Amanda Askren, 425-430-7369, aaskren@rentonwa.gov)
EXHIBIT 7
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ADVISORY NOTES TO APPLICANT
Page 2 of 2 LUA18-000678
1. Easements documents to be reviewed upon consultant completion. Comments will be provided prior
to recording of said easement documents.
Community Services:
(Contact: Leslie Betlach, 425-430-6619, lbetlach@rentonwa.gov)
1. None
Police:
(Contact: Cyndie Parks, 425-430-7521, cparks@rentonwa.gov)
1. None
Building:
(Contact: Craig Burnell, 425-430-7290, cburnell@rentonwa.gov)
1. None
DocuSign Envelope ID: B8D5474C-3764-4AAB-9F39-921E42EA7ABF
DEPARTMENT OF COMMUNITY
& ECONOMIC DEVELOPMENT
M E M O R A N D U M
DATE: December 7, 2018
TO:Jill Ding, Planner
FROM:Ann Fowler, Civil Plan Reviewer
SUBJECT: Utility and Transportation Comments for Thunder Hills Sewer
Interceptor Rehabilitation
Thunder Hills Creek from Grant Ave S/S 18th Street to I-405
LUA18-000551
I have reviewed the application for the Thunder Hills Sewer Interceptor Rehabilitation at Thunder
Hills Creek from Grant Ave S/S 18th Street to I-405 and have the following comments:
EXISTING CONDITIONS
The site is approximately 2.18 acres in size and is irregular in shape. The site consists of an existing
sewer interceptor alignment through the Thunder Hills Creek valley along with a gravel improved
access roadway located adjacent to the existing stream.
CODE REQUIREMENTS
SURFACE WATER
1. A geotechnical report, dated February 13, 2015, completed by Stantec, for the site has
been provided. The submitted report describes the site is a Severe Erosion Hazard area.
Erosion control measures will need to be in place prior to starting grading activities on the
site. Geotechnical recommendations presented need to be address within the project
plans.
2. Temporary erosion and sediment control plans are required and shall be in accordance
with the City of Renton Surfacewater Design Manual.
3. A Construction Stormwater General Permit from Department of Ecology will be required
since grading and clearing of the site exceeds one acre.
4. A Stormwater Pollution Prevention Plan (SWPPP) is required for the project site and shall
be submitted with the Civil Construction Permit Application.
5. Wet Season requirements found in Appendix D of the 2017 City of Renton Surface Water
Design Manual (RSWDM) shall be adhered to for construction occurring between October
1st and April 30th.
6. All work proposed outside of the applicant’s property will require a temporary
construction easement prior to any permits being issued.
TRANSPORTATION
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Thunder Hills Sewer Interceptor Rehabilitation – LUA18-000551
Page 2 of 2
1. Any work within or affecting traffic within the City right-of-way will require an approved
traffic control from the City.
2. Paving and trench restoration shall comply with the City’s Trench Restoration and Overlay
Requirements.
3. The right of way shall remain unobstructed when possible. No stockpiles are allowed in
the right of way. All truck maneuvering and materials storage shall occur on-site.
4. City streets shall be kept clean at all times and shall be swept in a timely manner. Truck
washing and / or other measures as approved by the Public Works Inspector may be
required for the duration of the project.
5. Construction hours outside of right of way: 7:00 AM to 8:00 PM Monday thru Friday and
9:00 AM to 8:00 PM on Saturday. Saturday work is by permission only. No work is allowed
on Sunday.
6. Construction hours inside of right of way: Follow approved traffic control plan. Saturday
work is by permission only. No work is allowed on Sunday.
7. Right of way haul hours: 8:30 AM to 3:30 PM Monday thru Friday. Hauling on Saturday is
by permission only. No hauling is allowed on Sunday.
GENERAL COMMENTS
1. Maximum exposed retaining wall height is 6-ft in residential zones and 8-ft in commercial
zones and shall be setback a minimum of 3-ft from the right-of-way as outlined in RMC 4-
4-040 – Fences, Hedges and Retaining Walls. A modification request is required to exceed
the height limitations outlined in City code.
2. A civil construction permit for the utility repairs is required. Civil construction plans shall
conform to the City Renton Drafting Standards. A licensed Civil Engineer shall prepare
the civil plans. Please visit the City’s website for submittal requirements:
https://rentonwa.gov/cms/One.aspx?portalId=7922741&pageId=9687014
3. A landscaping plan shall be included with the civil plan submittal.
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