1. SCMs: Post Construction and After

2. SCMs: Post Construction and After
Introduction
Staff
Program Background
Construction
Post Construction Program
Goals of Program
SCM’s in Cary
Reporting and Tracking
SCM Stakeholders
Case Studies
Q & A

3. WATER RESOURCES DEPARTMENT
Stormwater Division
SW Engineering Manager
Billy Lee
SW Engineer
Dan Clinton
Jan Patterson
SW Program Analyst
Charles Brown
SW Field Services Administrator
Matt Flynn
Sr. SW Engineering Technician
Todd Hoefler
SW Engineering Technicians
Kirk Stafford
Jeff Hall
Environmental Specialist
Eric Kulz

4. NPDES PHASE 2 Program NPDES Phase 2 Public Education & Outreach
Public Involvement & Participation
Illicit Discharge Detection & Elimination
Construction Site Runoff
Post Construction Site Runoff
Pollution Prevention & Good Housekeeping

5. NPDES Program Background
NPDES PHASE 2 Permit
History
July 1, 2005
NPDES Program Background
December 1, 2011
February 17, 2017

6. Construction Program

7. Site Plan Process Development Review Committee (DRC)
Plan Submittal
Development Review Committee (DRC)
Erosion and Sediment Control Plan (Construction)
Stormwater Management Plan (Post Construction)
Construction
Grading permit issued and work starts
Paperwork for the SCM initiated
Post Construction
Final paperwork submitted/inspection of device in final form
Certificate of Compliance issued and SCM enters post construction program with annual inspections

8. Construction to Post Construction

9. Conversion Issues Site is stabile Removal and disposal of sediment
Proper volume – As Built
Permanent stabilization
Plantings
Paperwork

10. Construction / Post Construction History
Mid 1990’s: Emphasis on constructing SCM’s as designed
Late 1990’s-2001: Emphasis on O&M for functionality
2001: Neuse River Rules - Nitrogen treatment (Cape Fear Basin included and paperwork for SCM’s)
2005: Phase 2 – TSS Treatment – impervious >24%
2007: Transitions to independent inspections by qualified professionals
2009: PE Certification within 30 days of conversion of SCM’s
2010: GIS compliance tracking for annual SCM inspects

11. Post Construction Program

12. Post Construction Program Goals
Regulate SCM Compliance (private and Town owned)
Approved SCM design functional integrity is preserved
SCM owner’s legal responsibilities are sustained in perpetuity
SCMs are maintained in perpetuity and comply with O&M Manual requirements
Track progress, deadlines, ownership information, photos, inspection reports

13. SCM’s in the Town of Cary
263 Wet Ponds
175 Bioretention Areas
221 Constructed Wetlands
113 Dry Ponds
160 Level Spreaders
41 Grass Swales
52 Sand Filters
58 Underground Detention Systems
9 Proprietary Devices (must be pre- approved by DWQ)
3 Riparian Buffers
4 Plunge Pools
1 Step Pool
10 Scour Hole
1 Permeable Pavement
1 Stormfilter
18 Unregulated
1169 SCMs at 547 sites

14. SCM’s in GIS

15. SCM Records SCM files include: Record drawings
Site specific Operation & Maintenance Manual
Financial security documentation (letters of credit)
Previous inspection reports (five years)
Professional engineer certification (30 days of completion)
Certificate of compliance letters

16. Stakeholders Designers (PE, RLA) of SCM Design Developer
Certification: initial and annually
Modifications
Developer
RP through Transfer
HOA/Developer/Citizens
O&M of SCM in perpetuity
SCM Contractors
Monthly/Quarterly/Annual O&M
Annual certification if qualified
Town of Cary
Compliance
Technical assistance
Plan Review
Construction
Post Construction
~Post Construction

17. Case Studies: How to assess and adapt program

18. Ardmore at Reedy Creek Multiple SCM’s and Phases in project
SCM’s converted and no compliance letter sent to owner placing the SCM in the post construction program
Developer turning over HOA property and selling off phases to track builders
HOA receiving SCM’s with maintenance not performed and overgrown

19. Issues Faced and Changes Made
SCM’s are sent compliance notifications as soon as all paperwork received
Before compliance letter is written there is a meeting onsite with owners reps and engineer (HOA members are allowed)
Punch list of items listed during meeting and corrections made and final inspection done to ensure work then letter sent
Certificate of Compliance changed to reflect that once letter is written the owner needs to start all maintenance obligations at that time

20. Glencroft Townhomes Townhome project with multiple SCM’s
Conversions ongoing through site
Certified by engineer and all paperwork received
Site visit set up for final walk through
Noted that multiple bioretention devices holding water past 48 hours

21. Issues Faced and Changes Made
The site visit with all parties revealed that the bioretention devices were having issues with meeting drawdown times.
Issues noted and a punch list prepared. The repair was not working and other issues noted due to long waits until they contacted the Town to look at work again.
Need to ensure that the engineer of record will sign off on the SCM’s and have them recertify after each attempt to make them compliant.
Will not write the certificate of compliance until the SCM is fully functional with state standards.

22. Park at Langston: Issues
Dry Ponds built for detention purposes (5 to 1.5 Acres)
Cut down in low area and had continuous issues with standing water and cattails (HOA complaints to Town)
Was developed and then annexed into the Town.
Developer cut and maintained vegetation at the request of HOA to be able to turn over the maintenance of the Dry Ponds

23. Issues Faced and Changes Made
The term Dry Pond is a misnomer to HOA. They think that it should be dry all the time with no standing water.
Had to change the mentality of looking at these devices as a open storage device a type of underground detention above ground.
The HOA hired firm to rewrite and to record changes to the O&M manual and the Maintenance Agreement.
Trained all Town staff who deal with SCM’s to ensure a consistent message.

24. Davis Square Townhome project with two SCM’s Bioretention and Wetland
SCM’s converted and certified by engineer and all paperwork received
Site visit performed and had no issues
Certificate of Compliance sent in December of 2016

25. Issues Faced and Changes Made
Received complaints from the HOA representative in May SCM had not been turned over from developer to HOA
Contacted the developer and engineer to ask that they may need to look into the matter
Issues noted and a action plan created to repair. The repair was not working and other issues noted.
HOA rep pressed Developer to fix issues and they are in the process of correcting them before turning over.
Working now to inform the HOA boards, management companies to address issues before taking on the task of maintaining SCM’s. Empower the HOA to act.

26. Medcon Ct Subdivision Project was completed in 2001
Wet pond serves as the SCM
Annual inspection in 2014 was failed due to sediment levels in the wet pond.
Wet pond drawn down and revealed that the pooling area was around 70 percent full.

27. Issues Faced and Changes Made
Has only 14 homeowners in the HOA and majority are retired
Were stating that a lot of water from offsite was being treated in the wet pond and that caused all the sedimentation
Wanted the Town to help pay for costs to clean out due to the offsite water.
Noted that wet ponds had a functional life and require a clean out and it was in the 15 year range of needing maintenance.
Meet with them as needed to assist with all they needed to bring the site into compliance.

28. Stakeholder Issues
HOA is the developer until the neighborhood is almost completely built out
Developer and the HOA transfer of property is a private transaction
HOA does not know how devices function (compliant or non compliant)
SCM is certified and is not meeting design standards
HOA is unaware of the cost to maintain devices

29. SCM Program Outcomes
Awareness of operation and maintenance manual requirements.
Quarterly and/or monthly reports and maintenance services are being done so that owners can comply with O&M manual maintenance requirements.
HOA’s are realizing the value of routine maintenance (Monthly/Quarterly) as necessary to avert larger problems. May even need to have bi-monthly or have weekly work done
Some sites have moved inspection months to coincide with the growing season or have multiple inspections at once.
The Town is a resource for owners

30. Questions
Charles Brown Stormwater Program Analyst