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Sign Posted On Site
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Public Noticing
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Signed Affidavit
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Resolved
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Public Noticing
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Miscellaneous Condition
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Resolved
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Standard Conditions
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Miscellaneous Condition
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Resolved
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Standard Conditions
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Miscellaneous Condition
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Resolved
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Standard Conditions
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Miscellaneous Condition
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Resolved
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Standard Conditions
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Miscellaneous Condition
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Resolved
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Standard Conditions
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Miscellaneous Condition
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Resolved
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Standard Conditions
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STORMWATER/ EROSION CONTROL:
• Refer to City Standards, Section 200 for Stormwater System Requirements. [PMC 17.42]
• Stormwater design shall be in accordance with PMC Chapter 21.10 and the current stormwater management manual as adopted by the City Council at the time of project application. The City is currently using the 2019 Department of Ecology (Ecology) Stormwater Management Manual for Western Washington (aka “Ecology Manual”).
• The applicant shall complete the stormwater flowchart, Figure 1-3.1 and Figure 1-3.2, contained in the Ecology Manual. The completed flowchart shall be submitted with the preliminary stormwater site plan and highlight the Minimum Requirements (MR) triggered by the project thresholds.
• NOTE: Areas of disturbance within the public ROW must be included in the project area as part of the stormwater thresholds and calculations.
• Public right-of-way runoff shall be detained and treated independently from proposed private stormwater facilities. This shall be accomplished by: 1) enlarging the private facilities to account for bypass runoff; 2) providing separate publicly maintained storm facilities within a tract or dedicated right-of-way; or, 3) 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; and Volume V.
• 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 III, Chapter 3, specifically:
- Groundwater evaluation, either instantaneous (MR1-5), or continuous monitoring (MR1-9), during the wet weather months (December 1 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 1 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 V Section V-5.4.
• Upon submission of the 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)
• 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]
• Overflow facilities shall be provided 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.
• Any proposed infiltration facility shall be designed in accordance with City standards and the following criteria to be provided by a licensed geotechnical engineer:
- The infiltration rates for the proposed infiltration facilities shall be determined using the Pilot Infiltration Test (PIT) described in 2019 DOE Stormwater Manual for Western Washington (Ecology Manual).
- The bottom of the infiltration facility shall be a minimum of 5-feet above the maximum wet season water table or bedrock/impermeable layer on the site.
- A separation down to 3-feet may be considered if supported by a groundwater mounding analysis performed by a licensed geotechnical engineer. [PMC 21.10]
• The proposed infiltration trench as shown on the preliminary site plan appears to meet the criteria as an Underground Injection Control (UIC) Well. This type of design must be registered with the Department of Ecology and designed in accordance with the Ecology Manual. (NOTE: Registration does not apply to residential roof runoff designs.)
- The applicant may elect to provide an alternative to the UIC well such as an infiltration trench without perforated pipe, bioretention, or other LID BMP.
- Please refer to City Standards 203 and the Department of Ecology’s website for more information.
• Water quality treatment of stormwater shall be in accordance with the Ecology Manual, Volume 1, Minimum Requirement 6; and Volume 5, Runoff Treatment.
• Overflow facilities shall be provided at the low points of any 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. The BMP descriptions and maintenance criteria shall be obtained from the "City of Puyallup Site Management Plan for Stormwater Operations and Maintenance." 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 permit issuance, the applicant shall post a financial guarantee in accordance with PMC 21.10.160 in the amount of 125% of the cost of the stormwater system.
• A Stormwater Systems Development fee will be assessed for each new equivalent service unit (ESU) in accordance with PMC Chapter 14.26. Each ESU is equal to 2,800 square feet of ‘hard’ surface. The current SDC as of this writing is $4,146.50 per ESU.
• Stormwater Systems Development fees are due at the time of site development permit or in the case where no site development permit is required, at the time of building permit issuance for the individual lot(s); and the fees do not vest until the time of site development permit issuance, or at the time of building permit issuance in the case where a site development permit is not required.
• 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.
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Miscellaneous Condition
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Resolved
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Standard Conditions
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Miscellaneous Condition
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Resolved
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Standard Conditions
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Miscellaneous Condition
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Resolved
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Standard Conditions
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Miscellaneous Condition
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Resolved
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Standard Conditions
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Miscellaneous Condition
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Resolved
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Submit With Civil Permit Application
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Miscellaneous Condition
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Resolved
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Submit With Civil Permit Application
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Miscellaneous Condition
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Resolved
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Submit With Civil Permit Application
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