Philadelphia Water Department

Appendices

Table E-7: Post-Construction Stormwater Management Plan Report Requirements

Table E-7: Post-Construction Stormwater Management Plan Report Requirements

PCSMP
Report Section*
Requirements
Cover
  • Signed and sealed by a Professional Engineer
Introduction/
Project Description

 

  • Project summary
  • Stormwater management summary
    • Applicable PWD Stormwater Regulations
    • Applicable State and Federal regulatory/permit requirements
  • Existing site and drainage conditions summary
Project Soils

 

  • Soil survey map
  • Hydrologic Soil Group discussion
Stormwater Management

 

  • Stormwater management design methodology
    • Rainfall depths and distribution, if applicable (Section 3.4)
    • Runoff estimation method, if applicable (Section 3.4)
    • Flow and storage routing methods, if applicable (Section 3.4)
  • Stormwater analysis summary and discussion
  • Proposed stormwater management design
    • Proposed stormwater management practice (SMP) summaries
    • Infiltration summary
    • Proposed disconnected impervious cover (DIC) summaries
Appendices

 

  • Stormwater analysis calculations
    • Static storage calculations, if applicable (Section 3.4.1)
    • Predevelopment and post-development Tc calculations, if applicable (Section 3.4.1)
    • Predevelopment and post-development hydrologic modeling, if applicable (Section 3.4.1)
      • Model routing
      • Input parameters
      • Hydrograph summaries
      • Pond summaries
  • Pipe capacity calculations
Data CD-ROM or Alternative

 

  • Electronic copies of all submitted materials
  • Hydrologic modeling input files, if applicable
The following items are required, but may be included in the PCSMP Report or submitted separately as part of the PCSMP Review Phase Submission Package.
Item Requirements
Drainage Area Plan(s)

 

  • Predevelopment and post-development drainage areas (including any off-site area)
  • Location of point(s) of analysis (POA)
  • Pertinent existing stormwater infrastructure necessary to define existing drainage conditions
Inlet Drainage
Area Plan

 

  • Predevelopment and post-development inlet drainage area delineations (including any roof leaders)
  • Calculated areas of drainage and time of concentration to each inlet
  • Impervious and pervious cover and runoff coefficients within each drainage area
PWD Stormwater Plan Review Worksheets (See Appendix G)

 

  • Copy of ERSA Application previously submitted to PWD
  • PDF printout of completed Online Technical Worksheet
  • Worksheet 4:  Operation and Maintenance Agreement Information
Geotechnical  Report

 

  • Signed and sealed by a Professional Engineer
  • Detailed description of testing procedure and materials/apparatus used
  • Weather information at time of testing and previous 24 hours (temperature, rainfall, etc.)
  • Engineer’s analysis and summary of all results including soil classification (in accordance with ASTM D2488) and site evaluation
  • Engineer’s affirmative or negative recommendation on feasibility of infiltration, with justification
  • Infiltration Testing and Soil Characterization Plan (including, but not limited to, topographic/existing features of the site showing location of test pits/borings and infiltration tests)
  • Field boring/test pit logs for soil profiling
  • Infiltration Testing Log (see Appendix H for template, which shows minimum level of information that must be provided)
  • Sieve analysis results per ASTM D422 and USCS classification per ASTM D2487 of each sample
  • Photographs of testing
  • A completed Infiltration Waiver Request Form (Appendix G), if infiltration is infeasible
Media Filter Design Documentation

 

  • Inflow and outflow event mean concentrations and percent removals for Total Suspended Solids (TSS) for sand/media filters (Designs must demonstrate a maximum effluent event mean concentration of 15 milligrams per liter for TSS at a POA downstream of the SMP)
  • Third-party certifications for proprietary media filters
  • Hydrologic and hydraulic model files, if applicable
  • Product specifications for proprietary media filters
  • Manufacturer’s guidelines for installation for proprietary media filters
  • Construction sequence
  • Maintenance requirements, including product life and replacement schedule, if applicable
Low Flow Device Design Documentation

 

  • Performance/discharge curves
  • Third-party certifications
  • Hydrologic and hydraulic model files, if applicable
  • Product specifications
  • Manufacturer’s guidelines for installation
  • Construction sequence
  • Maintenance requirements, including product life and replacement schedule, if applicable
Operation and Maintenance (O&M) Schedules

 

  • Site-specific O&M Schedule for each SMP
    • Provides for inspection of SMP, including routine maintenance, repair, and replacement (see maintenance guidelines in Chapter 4)
    • Provides for report documenting each inspection and all SMP maintenance activities performed as a result of inspections
Construction Certification Package with Customized SMP Construction Certification Forms (See Appendix J)

 

  • One site-specific SMP Construction Certification Form for each SMP

 

Proof of Applicable State and/or Federal Permits

 

  • Typical permits (as applicable):
    • Pennsylvania Code and Charter Chapter 102 NPDES National Pollutant Discharge Elimination System Phase II Permit for Construction Activities
    • Pennsylvania Code and Charter Chapter 105: Water Obstruction and Encroachment General and Joint Permits
    • Other applicable permits (see Section 2.5, Section 2.6, and Section 2.7 for resources to assist in determining which permits may apply)
  • Proof of issuance is required for PWD sign-off on a Building Permit; however, the applicant must only prove that they have applied for all applicable permits via copies of permit applications, application receipts, or notification letters from relevant agencies

*The PCSMP Report section divisions/organization listed are not required, but are provided by PWD to aid the applicant in organizing the required inclusions in the PCSMP Report.