Hearing Conservation Testing Worksheets - PowerPoint

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					      PCSM Plans
Common Mistakes, Notes, etc.
           Presented by
         Aneca Y. Crews
          PADEP-SERO




                   STRIVING TO MAKE STORMWATER   GREEN
                Agenda
• Common Mistakes
• PCSM Plan Notes
• Stormwater BMP Information Chart 5B




                                        2
Common Mistakes


                  3
             Common Mistakes
•   Insufficient infiltration documentation
    – No testing performed, not enough tests
      performed, test field logs not provided,
    – Unacceptable testing techniques utilized
      •   Testing not performed at location(s) or elevation(s)
          of proposed system(s)
      •   Avoid using the “perc” test
      •   Use infiltration test that determines hydraulic
          conductivity.
    – No geotechnical information provided
    – Reduction factors not used
                                                                 4
           Common Mistakes
• Runoff from impervious surfaces are
  conveyed directly to infiltration systems
  – Pretreatment should be provided for
    stormwater runoff prior to entering a subsurface
    infiltration system.
     • Clogging from sediment and debris→Failure
• Off-Site Discharges
  – Discharges are not going to well defined
    drainage features
  – Not identified in the Notice Of Intent (NOI)

                                                       5
Off site discharge (Section C)
                  Becoming a common
                       problem.




                                      6
     Off Site Discharges
– Easements (Legal Issue)
  • Fact Sheet
  • Follow bulleted items
– Analysis of discharge
  • Discharges to non-surfaces waters
    need to demonstrate that the
    discharge will not cause erosion or
    damage                                               Prof ile View
                                                             N.T.S.
                                                                                Suitable rigid measures and


– Discharge to Non-Surface
                                                                                protective geofabric (TRM)-
                                                                                min. 3 ft. or as needed.
                                                     X

  Water:                                  Inflow
                                                     Y
                                                                      Outflow




  • Level Spreader
                                                                                             Undisturbed
                                                          Plunge                             Ground
                                                     h     Pool


  • Conveyance                             Level
                                          Spreader
                                                                                        Optional Drain.
                                                                                        2” ductile iron
                                                                                        Driven horizontally
                                                                                                              7
               Common Mistake
•   Modified Rational Method used for Runoff
    Volume calculations.
    –   National Resources Conservation Service (NRCS)
        methods must be used for Volume calculations.
    –   The Modified Rational Method is not acceptable.
•   Potential Pollutants/Contamination
    –   Not identified on the NOI
    –   Contamination documentation not provided
    –   For Site Specific Standard or Non-residential
        Statewide Health Standards proper Erosion and
        sediment (E&S) not utilized
                                                          8
             Common Mistake
•   Not requesting a Pre-application
    meeting
    – Projects of complex nature or varying from PA
      Stormwater Best Management Practices
      (BMP) Manual should request pre-application
      meeting.
    – Conservation District and/or DEP
•   Inconsistencies between plans, details,
    and calculations
    – Inconsistent submittals will cause confusion
      and increase review time.
                                                      9
          Common Mistakes
• Structural/Non-Structural (NS) BMP
  Volume Credit
  – Volume reduction credit can only be taken for
    runoff reaching the proposed BMP during the
    2-yr 24 hour storm or a smaller event
  – No more than 25% of required volume
    reduction achieved through NS
  – Can not claim volume credits on Worksheet 5
    for extended detention

                                                    10
Non Structural Credits from WS 3


          Other credits for Non-Struct.
          BMPs are listed in Chapter 8
          of BMP Manual such as:
          BMP 5.4.3
          Protect/Utilize Natural Flow
             Paths
          Credit = ¼” x Area
          BMP 5.6.3 (pt. 2)
          Revegetate/Reforest
          Credit = 6 cf/tree    Deciduous

          or
          Credit = 10 cf/tree   Evergreen




                                         11
     Checklist: Criteria and Credits for Non
                Structural BMPs
Checklists are
found in Ch. 8
 (Section 8.8)

Checklists are
required when
 seeking NS
Volume Credit


   To receive
credit, each box
   should be
    checked.




                                               12
NPDES Application (rev. 12/2009)




                                   13
  Updated Worksheet 5
NEW             OLD




                        14
                   Worksheets


• Worksheets 1
  thru 5 and 10,
  should be
  completed for
  each point of
  interest.




                                15
Nitrates Compliance
          • Worksheet 10 can be
            misleading.
          • Only use when can meet
            Volume Control Guidance
            (CG-1).
             – If not, complete WS 11 to 13
          • Should control runoff from
            at least 90% of the
            disturbed area.
             – If not, also need WS 12 & 13.
             – WS 12 – Pollutant Loading
             – WS 13 – Pollutant Reduction

                                               16
Standard Notes


                 17
               Standard Notes
• Ownership, Operations, and Maintenance
  Procedures (Must be included on drawings)
  – Applicant or entity (association, company, agency, etc.)
    listed as responsible party


• Provide Quality Control of Materials. As with all
  BMPs, the final product is only as good as the
  materials and workmanship that went into it. The
  designer is encouraged to review and approve
  materials and workmanship, especially as related
  to aggregates, geotextiles, soil and topsoil, and
  vegetative materials.
                                                               18
                        Standard Notes
•    Do not compact soil infiltration beds during construction. Prohibit all
    heavy equipment from the infiltration area and minimize all other traffic.
    Equipment should be limited to vehicles that will cause the least compaction,
    such as tracked vehicles.
•   Protect the infiltration area from sediment until the surrounding site is
    completely stabilized. Methods to prevent sediment from washing into BMPs
    should be clearly shown on plans. Where geo-textile is used as a bed bottom
    liner, this should be extended several feet beyond the bed and folded over the
    edge to protect from sediment wash into the bed during construction, and then
    trimmed. Runoff from construction areas should never be allowed to drain to
    infiltration BMPs. This can usually be accomplished by diversion berms and
    immediate vegetative stabilization.
•   If an infiltration area is also to be utilized as a temporary sediment basin,
    excavation should be limited to within 1 foot of the final bottom invert of
    the infiltration BMP to prevent clogging and compacting the soil horizon, and
    final grade removed when the contributing site is fully stabilized. All infiltration
    BMPs should be finalized at the end of the construction process, when
    upstream soil areas have a dense vegetative cover.


                                                                                           19
    PCSM Notes & Permit Special
           Conditions
1. A Notice of Termination (NOT) will be required to be submitted following
approval of the final as-built plans. Prior to accepting the NOT, the
Department and/or Conservation District will perform final inspection to ensure
site stabilization and verify adequate installation and function of stomwater
best management practices (BMPs)

2. As-built plans for the stomwater BMPs for each project phase shall be
provided within six months following the completion of each phase. The as-
built plans shall be signed and sealed by a PA Registered Professional
Engineer.

3. The Permittee shall provide engineering construction oversight for the
proposed stormwater BMPs. Additional soil testing may be required prior to
the installation of infiltration BMPs to ensure proper location and function.

4. The permittee shall provide for engineering construction oversight for the
proposed stormwater best management practices (BMPs). A licensed
professional engineer knowledgeable in the design and construction of
stormwater BMPs, preferably the design engineer, shall conduct oversight.
                                                                                  20
STORMWATER BMP INFORMATION
         CHART 5B




                             21
 Stormwater BMP Info Chart 5.B
• Why is this needed?
  – A condensing of the calculations for proposed
    BMP’s
  – Highlights common mistakes
• Supporting calculation/documentation
  should be included in Stormwater Report




                                                    22
Stormwater BMP Info Chart 5.B




                                23
Infiltration Information




                           24
Stormwater BMP Info Chart 5.B




                                25
Drainage Information




                       26
Stormwater BMP Info Chart 5.B




                                27
BMP Information




                  28
Stormwater BMP Info Chart 5.B


      •Foot notes reference Appendix C of the PA
      BMP Manual under Site conditions and
      constraints and Design consideration




                                                   29
2-year 24-hour storm only
            Similar to WS 4 but limited to
          drainage to indiv. BMP (Post Dev)




                                              30
Section C – E&S and PCSM

       Stormwater BMP Chart 5B should match the summary
       table in section C.2 of the NPDES application. Both
       should match Stormwater Report




                                                             31
     How to expedite the review
• Submit a complete application
• Follow the application instructions and BMP Manual.
• Provide volume control for difference in 2-year w/o
  any voodoo hydrology.
• Utilize Worksheets and supporting checklists. (for
  each point of interest)
• Request a preapplication meeting with CD and/or
  DEP.
• Communicate with reviewer to better understand
  outstanding issues and find viable solution


                                                        32
       Timeframes* for NPDES
              Approval:
• Varies among by region and county.
• PAG-2:
   – 45 to 100 days
• Individual Permit:
   – 3 to 6 months
• Add another 60 days if a public hearing is required.
• Each deficiency letter allows 60 days to provide a
  complete response

   * Timeframes above assume a reasonably quick turnaround by
     designers to comments.



                                                                33
       Stormwater BMP Highlights
•   Chapter 3- Principles & Control Guidance
•   Chapter 5- Non-structural BMPs
•   Chapter 6- Structural BMPs
•   Chapter 8- Methods & Worksheets
•   Appendix C – Site Evaluation & Soil testing
•   NOI checklist & instruction




                                                  34
                     FIN
• Questions?

Contact Info:
Aneca Y. Crews
Stormwater Section
PA DEP - SERO
484-250-5129
acrews@state.pa.us




                           35
                  Checklists
• Criteria and Credits for
  Non-Structural BMPs.
  – Plan requirements
  – Required for most
    submittals requesting
    NS Credits.




                               36

				
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