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Sign Posted On Site
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Open
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Signed Affidavit
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Open
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Miscellaneous Condition
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Open
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GENERAL:
• Engineered plans must follow the latest regulations and standards set forth in the Puyallup Municipal Code (PMC), the City Standards for Public Works Engineering and Construction (design standards), and the current City adopted stormwater manual at the time of civil permit application [PMC 21.10.040].
• The comments provided below are intended to assist the applicant with incorporating City requirements into the project design documents, but should not be considered an exhaustive list of all necessary provisions from the PMC, design standards, or the Ecology stormwater manual.
• Comments regarding design and construction of new utilities and road improvements are provided for the applicant’s information and use. Unless specifically noted, construction of these infrastructure improvements is not a condition of landuse approval. However, infrastructure improvements must be approved and permitted prior to issuance of the first building permit associated with the project. [RCW 58.17.120 and 19.07.080]
• The individual lot designations shall be identified by numerals, starting with numeral one. [PMC 19.02.100]
• The following Dedication language shall be provided on the Final Plat document:
- FURTHER, THE UNDERSIGNED OWNERS OF THE LAND HEREBY SUBDIVIDED, WAIVE FOR THEMSELVES, THEIR HEIRS AND ASSIGNS, AND ANY PERSON OR ENTITY DERIVING TITLE FROM THE UNDERSIGNED, ANY AND ALL CLAIMS FOR DAMAGES AGAINST THE CITY OF PUYALLUP, ITS SUCCESSORS AND ASSIGNS, WHICH MAY BE OCCASIONED TO ADJACENT LAND BY THE CONSTRUCTION, DRAINAGE OR MAINTENANCE OF DEDICATED ROADS WITHIN THIS SUBDIVISION, OTHER THAN CLAIMS RESULTING FROM INADEQUATE MAINTENANCE BY THE CITY OF PUYALLUP.
- FURTHER, THE UNDERSIGNED OWNERS OF THE LAND HEREBY SUBDIVIDED, AGREE FOR THEMSELVES, THEIR HEIRS AND ASSIGNS, TO INDEMNIFY AND HOLD THE CITY OF PUYALLUP, ITS SUCCESSORS AND ASSIGNS, HARMLESS FROM ANY LOSSES, INCLUDING ANY REASONABLE COSTS OF DEFENSE, SUFFERED BY THE CITY OF PUYALLUP, ITS SUCCESSORS AND ASSIGNS, RESULTING FROM CLAIMS FOR DAMAGES BY PERSONS WITHIN OR WITHOUT THIS SUBDIVISION FINALLY ADJUDICATED TO HAVE BEEN CAUSED BY THE NEGLIGENCE OR WRONGFUL ACTS OR OMISSIONS OF THE UNDERSIGNED OWNERS, THEIR EMPLOYEES, AGENTS OR CONTRACTORS, IN ALTERING THE GROUND SURFACE, DRAINAGE OR SURFACE OR SUB-SURFACE WATER FLOWS WITHIN THIS SUBDIVISION, OR IN ESTABLISHING OR CONSTRUCTING THE ROADS WITHIN THIS SUBDIVISION.
- PROVIDED, THIS WAIVER AND INDEMNIFICATION SHALL NOT APPLY TO THE EXTENT THAT ANY LIABILITY OR DAMAGES RESULT IN WHOLE OR IN PART FROM THE NEGLIGENCE OR WRONGFUL ACTS OR OMISSIONS OF THE CITY OF PUYALLUP, OR ITS EMPLOYEES, AGENTS, CONTRACTORS, SUCCESSORS OR ASSIGNS.
- SUBJECT TO THE TERMS AND CONDITIONS CONTAINED HEREIN, THIS SUBDIVISION, DEDICATION, WAIVER OF CLAIMS AND AGREEMENT TO HOLD HARMLESS IS MADE WITH THE FREE CONSENT AND IN ACCORDANCE WITH THE DESIRES OF SAID OWNERS.
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Miscellaneous Condition
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Open
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Miscellaneous Condition
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Open
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Miscellaneous Condition
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Open
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STORMWATER/ EROSION CONTROL:
• Stormwater design shall be in accordance with the 2012 Stormwater Management Manual for Western Washington as amended in the December, 2014 (The 2014 SWMMWW aka “Ecology Manual”).
• Refer to City Standards, Section 200 for Stormwater System Requirements. [PMC 17.42]
• The applicant shall complete the stormwater flowchart, Figure 3.1, contained in Ecology’s Phase II Municipal Stormwater Permit, Appendix I. The completed flowchart shall be submitted with the preliminary stormwater site plan and highlight the Minimum Requirements (MR) triggered by the project thresholds. The link below may be used to obtain the flowchart:
Western Washington PH II Stormwater Permit
• NOTE: Areas of disturbance within the public ROW must be included in the project area as part of the stormwater thresholds and calculations.
• The applicant is responsible for submitting a preliminary stormwater management site plan which meets the design requirements provided by PMC Section 21.10 and Ecology Manual. The preliminary stormwater site plan (PSSP) shall be submitted with the landuse application to ensure that adequate stormwater facilities are anticipated prior to development of the property. The preliminary stormwater site plan shall reasonably estimate the quantity of stormwater runoff and the application of On-site Stormwater Management BMPs for the proposed development.
• The written technical report shall clearly delineate any offsite basins tributary to the project site and include the following information: [PMC 21.10.060]
- the quantity of the offsite runoff;
- the location(s) where the offsite runoff enters the project site;
- how the offsite runoff will be routed through the project site.
- the location of proposed retention/detention facilities
- and, the location of proposed treatment facilities
• Each section of the TIR/SSP shall be individually indexed and tabbed with each permit application and every re-submittal prior to review by the City. [PMC 21.10.060]
• Public right-of-way runoff shall be detained and treated independently from proposed private stormwater facilities. This shall be accomplished by enlarging the private facilities to account for bypass runoff; providing separate publicly maintained storm facilities within a tract or dedicated right-of-way; or, other methods as approved by the City Engineer. [PMC 21.10.190(3)]
• Development and redevelopment projects are required to employ, wherever feasible, Low Impact Development (LID) Best Management Practices (BMPs) to meet the design criteria set forth in PMC 21.10.190, the Ecology Manual Volume I, Minimum Requirement 5; Volume III, Chapter 3; and Volume V, Chapter 5.
• If infiltration facilities/BMPs are anticipated, the number of infiltration tests shall be based on the area contributing to the proposed facility/BMP, e.g., one test for every 5,000 sq. ft of permeable pavement, or one test for each bioretention cell.
• Preliminary feasibility/infeasibility testing for infiltration facilities/BMPs shall be in accordance with the site analysis requirements of the Ecology Manual, Volume I, Chapter 3, specifically:
- Groundwater evaluation, either instantaneous (MR1-5), or continuous monitoring (MR1-9), during the wet weather months (December 21 through April 1).
- Hydraulic conductivity testing:
i. If the development meets the threshold to require implementation of Minimum Requirement #7 (flow control); or, if the site soils are consolidated; or, if the property is encumbered by a critical area, then Small Scale Pilot Infiltration Testing (PIT) during the wet weather months (December 21 through April 1) is required.
ii. If the development does not meet the threshold to require implementation of Minimum Requirement #7; or, is not encumbered by a critical area; and is located on soils unconsolidated by glacial advance, grain size analyses may be substituted for the Small Scale PIT test at the discretion of the review engineer.
- Testing to determine the hydraulic restriction layer.
- Mounding analysis may be required in accordance with Ecology Volume III Section 3.3.8.
• Upon submission of any geotechnical infiltration testing, appropriate long-term correction factors shall be noted for any areas utilizing infiltration into the underlying native soils in accordance with the Ecology Manual, Volume III, Chapter 3. Provide the long-term infiltration rate calculation in the stormwater report.
• At the time of civil permit application, the applicant is responsible for submitting a permanent storm water management plan which meets the design requirements provided by PMC Section 21.10. [PMC 21.10.190, 21.10.060]
- When using WWHM for analysis, provide the following WWHM project files with the civil permit application:
- Binary project file (WHM file extension)
- ASCII project file (WH2 file extension)
- WDM file (WDM file extension)
- WWHM report text (Word file)
• The applicant has proposed a stormwater detention facility to serve the plat which is a conservative assumption in terms of the viability of the overall project. However, the City still has reservations that the feasibility/infeasibility criteria for implementing Minimum Requirement 5 (MR5) BMPs has been thoroughly contemplated per the Ecology Manual requirements. Specifically:
- The preliminary storm report dated May 25, 2022 and the associated geotechnical report dated May 3rd, 2022 only investigated the existing native soils under in situ conditions. Based on the geotechnical report, groundwater was not encountered under existing site conditions.
- However, the existing site is proposed to be substantially regraded and filled, up to 32ft deep. Considering that the Ecology Manual only requires 1-foot of separation to any restrictive layer for permeable pavements, it is conceivable that permeable pavements may be a feasible BMP.
- In addition, the Ecology Manual allows a minimum feasiblility infiltration rate of 0.3 in/hr. The preliminary storm report does not provide any substantiating documentation that the proposed imported fill cannot meet this minimum infiltration rate.
- At the time of civil application, the applicant shall further investigate the feasibility/infeasibility of implementing Minimum Requirement #5 permeable pavement based on the final grading plan (cut/fill areas) for the project. If permeable pavement is deemed feasible, the project shall conduct confirmation infiltration testing of the imported fill at the time of construction.
- There may be other BMP infeasibility criteria available to the applicant outlined in the Ecology Manual that would prevent the use of permeable pavement. For example, downstream impacts associated with lateral flow, potential erosion hazards, and/or slope stability concerns due to infiltrated stormwater, but the current application materials do not provide sufficient information to support a definitive infeasibility determination for the use of permeable pavement on the imported fill.
• In the event that during civil design, there is insufficient room for proposed stormwater facilities in the area(s) shown on the major plat, the stormwater area(s) shall be increased as necessary so the final design will be in compliance with current City Standards. This may result in the number of lots being reduced, or a reduction in other site amenities. [PMC 21.10.060(4), 21.10.150]
• Overflow facilities shall be provided for any proposed detention/retention (R/D) facilities in accordance with the City Standards. This includes a downstream analysis a minimum of ¼ mile downstream from the site.
• Any above-ground stormwater facility shall be screened from public right-of-way and adjacent property per the underlying zoning perimeter buffer requirements in the PMC.
• Stormwater R/D facilities shall be a minimum of 20-feet from any public right-of-way, tract, vegetative buffer, and/or property line. [PMC 21.10 & DOE Manual, Vol. V, Pg 10-39 and Pg 10-9]
• The 2-yr, 10-yr, and 100-yr water surface elevation (WSE) shall be shown on the R/D facility cross-section(s).
• The proposed project discharges to an adjacent wetland; the applicant shall provide a hydrologic analysis prior to landuse approval which ensures the wetland’s hydrologic conditions, hydrophytic vegetation, and substrate characteristics are maintained. See Ecology Manual Volume I, Minimum Requirement 8.
- Clarify how the wetland hydrology is being maintained. Provide hydroperiod analysis for the adjacent wetland in accordance with the DOE Manual, MR8 and Appendix I-D.
• Water quality treatment of stormwater shall be in accordance with the Ecology Manual, Volume 1, Minimum Requirement 6; and Volume 5, Runoff Treatment.
• If permeable pavement is proposed, overflow facilities shall be provided at the low points of the proposed permeable pavement areas to allow safe discharge to the downstream public storm system.
• Trench dams shall be provided at the property line for utilities located below infiltrative facilities including, but not limited to, permeable pavements and bioretention facilities. Reference City Standard Detail 06.01.10.
• At the time of civil permit application, all pipe reaches shall be summarized in a Conveyance Table containing the following minimum information and included in the TIR:
Pipe Reach Name Design Flow (cfs)
Structure Tributary Area Pipe-Full Flow (cfs)
Pipe Diameter (in) Water Depth at Design Flow (in)
Pipe Length (ft) Critical Depth (in)
Pipe Slope (%) Velocity at Design Flow (fps)
Manning’s Coefficient (n) Velocity at Pipe-Full Flow (fps)
Percent full at Design Flow (%)
HGL for each Pipe Reach (elev)
• All storm drains shall be signed as follows:
a) Publicly maintained stormwater catch basins shall be signed using glue-down markers supplied by the City and installed by the project proponent.
b) Privately maintained stormwater catch basins shall be signed with pre-cut 90ml torch down heavy-duty, intersection-grade preformed thermoplastic pavement marking material. It shall read either “Only Rain Down the Drain" or “No Dumping, Drains to Stream”. Alternatively, the glue-down markers may be purchased from the City for a nominal fee.
• All private storm drainage facilities shall be covered by a maintenance agreement provided by the City and recorded with Pierce County. Under this agreement, if the owner fails to properly maintain the facilities, the City, after giving the owner notice, may perform necessary maintenance at the owner’s expense.
• Erosion control measures for this site will be critical. A comprehensive erosion control plan will be required as part of the civil permit application.
• Prior to the final plat being accepted by the City, all disturbed areas within the site shall be stabilized to the satisfaction of the City Engineer.
• Applicant will be required to delineate, dimension, field stake, and flag all limits of clearing, wetland buffers, and other sensitive areas PRIOR to work commencing.
• A Stormwater Systems Development Charge (SDC) will be assessed for each new single family residence. The current SDC as of this writing is $3,560.00 per unit.
• A Construction Stormwater General Permit shall be obtained from the Department of Ecology if any land disturbing activities such as clearing, grading, excavating and/or demolition will disturb one or more acres of land, or are part of larger common plan of development or sale that will ultimately disturb one or more acres of land. The link below may be used to obtain information to apply for this permit:
Construction Stormwater General Permit
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Miscellaneous Condition
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Open
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Miscellaneous Condition
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Open
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Miscellaneous Condition
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Open
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