HomeMy WebLinkAboutROWP23-016 CONDSDepartment of Local Services
Permits
919 SW Grady Way, Suite 300
Renton, WA 98057
206-296-6600 TTY Relay: 711
Permit Conditions
Application Number: ROWP23-0016
Application Date: 08/22/2023
Applicant: JESSICA BRUCE
AHBL
2215 N 30TH ST #300
TACOMA, WA 98403
The Permit Conditions attached to this cover sheet apply to the permit referenced herein. These conditions
must be complied with by the applicant and verified by DLS Permits staff or this permit may become null and
void.
Site Address/Location: WA
Parcel Number:
Permit Type: Engineering/Right of Way/NA/NA
Title: 154TH AVE DITCH IMPROVEMENTS ROW
Description: IMPLEMETING A SEPA CONDITION FOR MAPLE HIGHLANDS PRELIMARY PLAT
(CITY OF RENTON) TO REGRADE THE EXISTING STORMWATER DITCH AND UPSIZE THE
EXISTING DRIVEWAY CULVERTS FROM THE EXISTING 18'' OUTFALL AT 14010 154TH AVE SE
TO THE SOUTHERN DRIVEWAY AT 14024 154TH AVE SE
Valuation: $0.00
Reviewed By:
Clearing and Grading Conditions:Lorie Hammerli, 206-477-7493, lorie.hammerli@kingcounty.gov
Recommended Construction Sequence:Lorie Hammerli, 206-477-7493, lorie.hammerli@kingcounty.gov
Special Conditions:Lorie Hammerli, 206-477-7493, lorie.hammerli@kingcounty.gov
Standard ESC Conditions:Lorie Hammerli, 206-477-7493, lorie.hammerli@kingcounty.gov
Surface Water Design:Lorie Hammerli, 206-477-7493, lorie.hammerli@kingcounty.gov
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Permit Number:ROWP23-0016
Permit Conditions
Engineering - Site
Clearing and Grading Conditions
CG - 11)
Stockpile and staging areas shall not be located within the right of way or the drainage easement. They shall
have TESC measures adequate to prevent any surface waters that are or might be concentrated from
carrying sediment from the site to a natural watercourse. DLSP may require a restoration plan be submitted
for review and approval for any stockpiling or staging areas associated with the permit. Staging and
stockpiling areas may be located on existing access roads.
CG - 102)
During hauling operations, permittee shall provide effective dust control measures consisting of water,
asphalt treated base, chemical dust palliatives, or equivalent measures to control dust from this operation.
Dust, dirt or airborne solids from any source shall not be emitted in quantities as to adversely affect adjacent
properties and/or public traffic. Permittee shall abide by the regulations of the Puget Sound Clean Air
Agency (PSCAA). This site may be located in a NO-BURN ZONE. Contact PSCAA at (206)343-8800
for information.
CG - 113)
During the seasonal limitation period, clearing and grading will be allowed only if there is installation and
maintenance of an erosion and sedimentation control plan approved by the department that defines any
limits on clearing and grading or specific erosion and sediment control measures required during the seasonal
limitation period. The department may require or approve alternate best management practices.
CG - 124)
If, during the course of construction activity or soil disturbance during the seasonal limitation period,
silt-laden runoff violating standards in the King County Surface Water Design Manual leaves the
construction site or if clearing and grading limits or erosion and sediment control measures shown in the
approved plan are not maintained, a citation and stop work order will be issued in accordance with K.C.C.
chapters 23.20 and 23.28, respectively.
CG - 135)
If the erosion and sediment control problem defined in the citation or stop work order is not adequately
repaired within twenty-four hours of issuance, then a notice and order may be issued in accordance with
K.C.C. chapter 23.24 to install adequate erosion and sediment control measures to stop silt-laden runoff
from leaving the site. The notice and order may also require the property owner to discontinue any further
clearing or grading, except for erosion and sediment control maintenance and repair, until the following
__________.
CG - 146)
Cuts and fills shall conform to the following provisions unless otherwise approved by the department:
1. A slope of cut and fill surfaces shall not be steeper than is safe for both the intended use and soil type
and shall not exceed two horizontal to one vertical;
2. All disturbed areas including faces of cuts and fill slopes shall be prepared and maintained to control
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Permit Number:ROWP23-0016
erosion in compliance with K.C.C.16.82.095;
3. The ground surface shall be prepared to receive fill by removing unsuitable material such as concrete
slabs, tree stumps, brush, car bodies and other materials as determined by the department;
4. Except in an approved sanitary landfill or as part of engineered fill, fill material shall meet the following
standards:
a. Fill material shall consist of earthen material, organic material or recycled or reprocessed materials that
are not categorized as dangerous waste under Title 173 WAC and that were produced originally from an
earthen or organic material;
b. Fill material shall have a maximum dimension of less than twelve inches;
c. Recycled concrete shall be free of rebar and other materials that may pose a safety or health hazard;
d. Recycled asphalt shall not be used in areas subject to exposure to seasonal or continual perched ground
water, in a critical aquifer recharge area or over a sole-source aquifer; and
e. Recycled materials that have not been reprocessed to meet the definition of common borrow shall be
intermixed with well-graded, natural, earthen materials in sufficient quantities and of a suitable size to assure
filling of all voids and to assure that the fill can be compacted to ninety percent of the maximum density;
5. Provisions shall be made to:
a. prevent any surface water or seepage from damaging the cut face of any excavation or the sloping face of
a fill; and b. address any surface water that is or might be concentrated as a result of a fill or
excavation to a natural watercourse in accordance with K.C.C. chapter 9.04 and the Surface Water Design
Manual;
6. Benches and any swales or ditches on benches shall be designed in accordance with the King County
Surface Water Design Manual;
7. The tops and the toes of cut and fill slopes shall be set back from property boundaries and structures as
far as necessary:
a. for the safety of the adjacent properties;
b. for adequacy of foundation support;
c. to prevent damage resulting from water runoff or erosion of the slopes; and
d. to preserve the permitted uses on the adjacent properties; and
8. All fill shall meet the following:
a. Fill greater than three feet in depth shall be engineered and
compacted to accommodate the proposed use unless a notice on title documenting the location of the fill is
recorded and the fill is sufficiently stable to not pose a hazard; and b. Any fill in the floodplain shall, from the
face of the fill to a horizontal distance of six feet back from the face, meet the compaction requirements for
pond embankments in the Surface Water Design Manual, unless determined by the department that
inundation is not a threat to fill integrity or that other requirements necessary for compliance with the King
County Guidelines for Bank Stabilization (Surface Water Management 1993) are met.
CG - 157)
Access roads to residential sites shall be:
1. Maintained and located to the satisfaction of the King County DLSP to minimize problems of dust, mud
and traffic circulation;
2. Located where the permanent access to the site is proposed in the permit application to minimize site
disturbance; and
3.Controlled by a gate when required by the department.
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CG - 168)
Signs warning of hazardous conditions, if determined by the department to exist on a particular site, shall be
affixed at locations as required by the department.
CG - 179)
Rocks, dirt, mud, vegetation and any other materials used or produced on-site in the course of permitted
activities shall not be spilled onto or otherwise left on public roadways or any off-site property not
specifically authorized as a receiving site under a valid permit.
CG - 210)
Work shall be limited to that shown on the approved site plans stamped dated ________ by
___________, PE of King County Department of Local Services - Permitting. A copy of the approved
plans, conditions, and permit must be on the job site whenever work is in progress.
CG - 311)
Permittee is responsible to call 1-800-424-5555 not less than 48 hours before beginning excavation where
any underground utilities may be located. Permittee is responsible to notify the utility company of this work
when overhead power, telephone, or utilities may be affected by this project.
CG - 512)
Permittee shall be responsible for implementing all appropriate measures needed (i.e. paving, sweepers,
and/or other techniques) to keep streets and roads used as haul routes for export or import of materials
clean and free from debris, mud, etc. Rocked construction entrances shall be installed where ever
equipment, trucks, etc... will be running from disturbed areas to pavement on existing roads.
CG - 613)
Any damage to pavement edges, sidewalk, curb and gutter, etc., resulting from construction authorized by
this permit shall be repaired immediately.
CG - 714)
Prior to filling and/or grading of this site, the ground surface shall be prepared by removing all clearing
debris, stumps, and other unsuitable material from the site. Only earth materials which have no rock or
similar irreducible material with a maximum dimension greater than 12 inches shall be used as fill.
CG - 815)
If the contractor chooses to dispose of excess excavated material on other sites, provide documentation
King County DLSP inspector that these sites have been inspected by a consultant capable of identifying
critical areas as defined by King County Code. The report shall include date of inspection, name of
consultant and company, an assessor’s map of the parcel, the name, address and phone number of the
property owner, and the location of the fill placed on the property. No fill shall be placed in critical areas or
their buffers on these sites.
CG - 916)
Failure to comply with any of the conditions contained within this permit shall be immediate cause for
suspension of the permit and fines and penalties pursuant to King County Code Title 21A, and 23 and
Chapters 9.04, 9.12, and 16.82.
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Recommended Construction Sequence
Recommended Construction Sequence17)
A detailed construction sequence is needed to ensure that erosion and sediment control measures are
applied at the appropriate times. A recommended construction sequence is provided below:
1. Hold the pre-construction meeting.
2. Post sign with name and phone number of ESC supervisor (may be consolidated with the required notice
of construction sign).
3. Flag or fence clearing limits.
4. Install catch basin protection, if required.
5. Grade and install construction entrance(s).
6. Install perimeter protection (silt fence, brush barrier, etc.).
7. Construct sediment ponds and traps if applicable.
8. Grade and stabilize construction roads.
9. Construct surface water controls (interceptor dikes, pipe slope drains, etc.) simultaneously with clearing
and grading for residential project.
10. Maintain erosion control measures in accordance with King County standards and manufacturer's
recommendations.
11. Relocate erosion control measures, or install new measures so that as site conditions change, the erosion
and sediment control is always in accordance with the King County Erosion and Sediment Control
Standards.
12. Cover all areas that will be unworked for more than seven days during the dry season or two days
during the wet season with straw, wood fiber mulch, compost, plastic sheeting, or equivalent.
13. Stabilize all areas within seven days of reaching final grade.
14. Seed, sod, stabilize, or cover any areas to remain unworked for more than 30 days.
15. Upon completion of the project, stabilize all disturbed areas and remove BMPs if appropriate.
Special Conditions
SC - 118)
Pre-Construction meeting is required prior to any land disturbing activity. The ESC Supervisor shall attend
the pre-construction meeting.
Contact 1-888-546-7728 to schedule Pre-Construction Meeting.
SC - 219)
King County does not make any warranties regarding water rights for the proposed development. The
property owner is responsible for establishing and maintaining a legal water source.
Standard ESC Conditions
SEC - 120)
Approval of this erosion and sedimentation control (ESC) plan does not constitute an approval of
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permanent road or drainage design (e.g., size and location of roads, pipes, restrictors, channels, retention
facilities, utilities, etc.).
SEC - 1021)
The ESC facilities on inactive sites shall be inspected and maintained a minimum of once a month during the
dry season, bi-monthly during the wet season, or within twenty four (24) hours following a storm event.
SEC - 1122)
At no time shall more than one (1) foot of sediment be allowed to accumulate within a catch basin. All
catch basins and conveyance lines shall be cleaned prior to paving. The cleaning operation shall not flush
sediment-laden water into the downstream system.
SEC - 1323)
Cover measures will be applied in conformance with Appendix D of the Surface Water Design Manual.
SEC - 1424)
Prior to the beginning of the wet season (Oct. 1), all disturbed areas shall be reviewed to identify which
ones can be seeded in preparation for the winter rains. Disturbed areas shall be seeded within one week of
the beginning of the wet season. A sketch map of those areas to be seeded and those areas to remain
uncovered shall be submitted to the King County inspector.
SEC - 225)
The implementation of these ESC plans and the construction, maintenance, replacement, and upgrading of
these ESC facilities is the responsibility of the applicant and/or ESC supervisor until all construction is
approved.
SEC - 326)
The boundaries of the clearing limits shown on this plan must be clearly marked with brightly colored tape or
plastic or metal safety fencing. If tape is used, it should be supported by vegetation or stakes, and should be
about 3 to 6 feet high and highly visible. Equipment operators should be informed of areas of vegetation that
are to be left undisturbed prior to construction (2009 KCSWDM Appendix D). During the construction
period, no disturbance beyond the clearing limits shall be permitted. The clearing limits shall be maintained
by the applicant/ESC supervisor for the duration of construction.
SEC - 427)
Stabilized construction entrances shall be installed at the beginning of construction and maintained for the
duration of the project. The applicant shall use Hot Mix Asphalt (HMA) to pave from the edge of pavement
to the right-of-way before installing the construction entrance from the right-of-way onto the project site
(See 2016 King County Road Design and Construction Standards). Additional measures, such as
constructed wheel wash systems or wash pads, may be required to ensure that all paved areas are kept
clean and track out to road right-of-way does not occur for the duration of the project.
SEC - 528)
The ESC facilities shown on this plan must be constructed prior to or in conjunction with all clearing and
grading so as to ensure that the transport of sediment to surface waters, drainage systems, and adjacent
properties is minimized.
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SEC - 629)
The ESC facilities shown on this plan are the minimum requirements for anticipated site conditions. During
the construction period, these ESC facilities shall be upgraded as needed for unexpected Storm events and
modified to account for changing site conditions (e.g. additional cover measures, additional sump pumps,
relocation of ditches and silt fences, perimeter protection etc.) as directed by the certified erosion control
specialist or by King County.
SEC - 730)
The ESC facilities shall be inspected daily by the applicant/ESC supervisor and maintained to ensure
continued proper functioning. Written records shall be kept of weekly reviews of the ESC facilities.
SEC - 831)
Any areas of exposed soils, including roadway embankments, that will not be disturbed for two consecutive
days during the wet season or seven days during the dry season shall be immediately stabilized with the
approved ESC methods(e.g., seeding, mulching, plastic covering, etc.).
SEC - 932)
Any area needing ESC measures that do not require immediate attention shall be addressed within seven (7)
days.
Surface Water Design
T - 133)
The duff layer, native top soil, and natural vegetation shall be retained in an undisturbed state to the
maximum extent practicable. If it is not practicable to retain the duff layer in place, it should be stockpiled
on-site, covered to prevent
erosion, and replaced immediately upon completion of the ground disturbing activities.
T - 1034)
All construction activities shall be done in a manner that prevents pollution of surface waters and ground
waters as specified in the King County's Stormwater Pollution Prevention Manual (SPPM). See "Control of
Other Pollutants," Section D.3.5 (p. D-135), for specific measures and references to applicable activity
sheets in the SPPM.
T - 1135)
All exposed and unworked soils shall be stabilized through the application of cover measures to protect the
soil from the erosive forces of raindrop impact, flowing water, and wind erosion. One or more of the
following cover measures may be used to meet this requirement during the construction phase:
• Mulching (See Section D.2.1.2.2, p. D-16)
• Nets and Blankets (See Section D.2.1.2.3, p. D-18)
• Plastic Covering (See Section D.2.1.2.4, p. D-20)
• Seeding (See Section D.2.1.2.6, p. D-24)
• Sodding (See Section D.2.1.2.7, p. D-28)
Cover measures shall be applied in accordance with the following requirements:
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1. Cover measures must be installed if an area is to remain unworked for more than seven days during the
dry season (May 1 to September 30) or for more than two consecutive working days during the wet season
(October 1 to April 30). These time limits may be relaxed if an area poses a low risk of erosion due to soil
type, slope gradient, anticipated weather conditions, or other factors. Conversely, the County may reduce
these time limits if site conditions warrant greater protection (e.g., adjacent to significant aquatic resources
or highly erosive soils) or if significant precipitation is expected.
2. Any area to remain unworked for more than 30 days shall be seeded or sodded unless the County
determines that winter weather makes vegetation establishment infeasible. During the wet season, exposed
ground slopes and stockpile slopes with an incline of 3 horizontal to 1 vertical (3H:1V) or steeper and with
more than ten feet of vertical relief shall be covered if they are to remain unworked for more than 12 hours.
Also during the wet season, the material necessary to cover all disturbed areas must be stockpiled on site.
The intent of these cover requirements is to have as much area as possible covered during any period of
precipitation.
3. Exposed soils shall be stabilized at the end of the workday prior to a weekend, holiday, or predicted rain
event.
4. Where seeding for temporary erosion control is required, use the standard set forth in the 2021 King
County Surface Water Design Manual Appendix D. See KCSWDM Appendix D, Section D.2.1.2.6, p.
D-24.
5. Where straw mulch for temporary erosion control is required, mulch shall be applied at a minimum
thickness of 2 inches.
T - 1236)
Establish a stabilized entrance for construction vehicle access to minimize the tracking of Sediment onto
public roads. Entrance and exit shall be limited to one route. See "Stabilized Construction Entrance," 2021
Appendix D, Section D.2.1.4.1 (p. D-42), for detailed specifications.
T - 1337)
If sediment is tracked offsite, public roads shall be cleaned thoroughly at the end of each day, or more
frequently during wet weather, if necessary to prevent sediment from entering waters of the state. Sediment
shall be removed from roads by shoveling or pickup sweeping and shall be transported to a controlled
sediment disposal area. Street washing will be allowed only after sediment is removed in this manner. Street
wash wastewater shall be controlled by pumping back onsite, or otherwise be prevented from discharging
into drainage systems tributary to surface waters.
T - 1438)
All temporary ESC measures shall be removed within 30 days after final site stabilization is achieved or after
the temporary measures are no longer needed. Trapped sediment shall be removed or stabilized onsite.
Disturbed soil areas resulting from removal of measures or vegetation shall be permanently stabilized with
seeding or sodding.
T - 1539)
Prior to final construction approval, the project site shall be stabilized to prevent sediment-laden water from
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leaving the project site after project completion. All disturbed areas of the project site shall be vegetated or
otherwise permanently stabilized. At a minimum, disturbed areas must be seeded and mulched to ensure that
sufficient cover will develop shortly after final approval. Mulch without seeding is adequate for small areas to
be landscaped before October 1.
T - 1640)
Prior to obtaining final construction approval, the site shall be stabilized, the structural ESC measures, such
as silt fences and sediment traps, removed, and drainage facilities cleaned. The removal of ESC measures is
not required for those projects, such as plats, that will be followed by additional construction under a
different permit. In these circumstances, the need for removing or retaining the measures must be evaluated
on a site-specific basis.
T - 1741)
To obtain final construction approval, the following conditions must be met:
1. All disturbed areas of the site shall be vegetated or otherwise permanently stabilized. At a minimum,
disturbed areas shall be seeded and mulched (see Section D.2.1.2.6) with a high likelihood that sufficient
cover will develop shortly after final approval. Mulch without seeding is not adequate to allow final approval
of the permit, except for small areas of mulch used for landscaping. The only exceptions to these
requirements are lots within a plat that are to be developed under an approved residential permit
immediately following plat approval. In these cases, mulch and/or temporary seeding are adequate for
cover.
2. Structural measures such as, but not limited to, silt fences, pipe slope drains, construction entrances,
storm drain inlet protection, and sediment traps and ponds shall be removed from the site. Measures that
will quickly decompose, such as brush barriers and organic mulches, may be left in place. In the case of silt
fences, it may be best to remove fences in conjunction with the seeding, since it may be necessary to bring
machinery back in to remove them. This will result in disturbed soils that will again require protection. The
DLSP inspector must approve an applicant's proposal to remove fencing prior to the establishment of
vegetation. In some cases, such as residential building following plat development, it shall be appropriate to
leave some or all ESC measures for use during subsequent development. This shall be determined on a
site-specific basis.
3. All permanent surface water facilities, including catch basins, manholes, pipes, ditches, channels, flow
control facilities, and water quality facilities, shall be cleaned. Any offsite catch basin that required protection
during construction (see Section D.2.1.5.3) shall also be cleaned.
4. If only the infrastructure of the site has been developed (e.g., subdivisions and short plats) with building
construction to occur under a different permit, then the critical area buffers, Critical Area Tracts, or Critical
Area Setback Areas shall be clearly marked as described in Section D.2.1.1 (p. D-11) in order to alert
future buyers and builders.
T - 242)
If DLSP finds that implementation of the proposed Small Site ESC plan is insufficient to prevent the
discharge of sediment or other pollutants to the maximum extent practicable, additional measures will be
required by DLSP. In some cases, an ESC plan or a complete Construction Stormwater Pollution Plan
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prepared by a civil engineer per Chapter 2 of the Surface Water Design Manual may be required.
T - 343)
The ESC plan outlines the minimum requirements for anticipated site conditions. During construction, ESC
plans shall be revised as necessary by the ESC supervisor or as directed by King County to address
changing site conditions, unexpected storm events, or non-compliance with the ESC performance criteria in
Section D.4.1 (p. D-69). If non-compliance with the ESC performance criteria occurs, the plan must be
updated within 7 days of inspections or investigations. Implementation of the onsite changes must
occurwithin 10 days.
T - 444)
The contractor or other persons performing construction activities shall comply with the stormwater
pollution prevention measures/BMPs specified for such activities in the King County Stormwater Pollution
Prevention Manual.
T - 545)
Prior to commencing construction, the applicant must identify to the County a contact person responsible for
overseeing the installation and maintenance of required ESC measures and compliance with the Stormwater
Pollution Prevention Manual during construction. The name and contact information for this person must be
on or attached to Small Site ESC plan at the time of the pre-construction meeting.
T - 646)
Both the applicant and contractor are responsible for implementation and maintenance of the approved ESC
plan and any additional measures required by the County.
T - 747)
The Small Site ESC plan shall be retained onsite or within reasonable access to the site. The plan shall be
modified whenever there is a significant change in the design, construction, operation, or maintenance at the
construction site that has, or could have, a significant effect on the discharge of pollutants to surface waters.
The plan shall be modified, if during inspections or investigations conducted by the County, it is determined
that the plan is ineffective in eliminating or significantly minimizing pollutants in stormwater discharges from
the site. The plan shall be modified as necessary to include additional or modified measures designed to
correct problems identified.
T - 848)
Stormwater runoff originating on the site and/or entering the site from offsite areas must be controlled per
the approved plan so as to minimize erosion of disturbed areas and exposed cut and fill slopes. The
following runoff control measures shall be used as needed per the conditions of use and specifications for
each measure:
• Interceptor Dikes and Swales (see Appendix D, Section D.3.6.1, p. D-57 for conditions of use and
specifications)
• Ditches (see Appendix D, Section D.7.4.2, p. D-87 for conditions of use and specifications)
• Pipe Slope Drain (see Appendix D, Section D.7.4.3, p. D-88 for conditions of use and specifications).
T - 949)
Accumulated water in foundation areas, excavations, and utility trenches shall be removed and disposed of
in a manner that does not pollute surface waters or cause downstream erosion or flooding. See "Dewatering
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Control," Section D.3.7 (p. D-65), for detailed specifications.
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