TOWN OF CARRBORO STORMWATER ADVISORY COMMISSION

Transcription

1 TOWN OF CARRBORO STORMWATER ADVISORY COMMISSION AGENDA November 8th, 2018; 6:30 pm Town Hall Room 100 Time Item Presenter 6:30 pm Administrative matters Chair Adjustments to agenda Approval of 9/20 minutes 6:35 pm Staff update and coordination with Commission Staff, All 7:20 pm Announcements and adjourn Chair

2 TOWN OF CARRBORO STORMWATER ADVISORY COMMISSION SUMMARY Meeting on September 20, 2018, 6:30 pm, Town Hall Basement Meeting Room Commission Members Guests Staff John Cox (vice-chair) Tom Hoban Richard Gurlitz Nil Ghosh Jim Joyce Minali Nigam Sarah Vinas Randy Dodd Robert Dickson Jeanette O Connor (chair) Bill Spang Trish Malarkey Kacy Gordon Daniel Perry Heather Holley Randee Haven O Donnell (BoA) Shauna Hay Michael Paul (absent) Cliff Credle Wayne Hadler Mike Humphrey Jerre Kennedy Carol Lerner Andrew Lerner Meredith Bratcher Marek Kossowski Town Engineer Bill Roark Jeff Kleaveland Marty Roupe Administrative Matters The meeting was called to order at 6:32 pm Sanderway CUP Mr. Kleaveland (Zoning Staff) provided a brief presentation with an orientation to the project. Mr. Gurlitz (Sanderway applicant) provided a presentation describing the development application with focuses on: an area overview; stormwater dynamics in the catchment; the CUP process and the information that is required for stormwater documentation at this stage of design; the LUO stormwater requirements and the project s approach to meeting the requirements (general site planning; Filterras for treating 1 water quality event; underground detention for meeting 1-25 year storm event; level spreader for diffuse flow; post construction maintenance requirements. Mr. Ghosh and Mr. Perry presented on behalf of the owners of the neighboring properties located downhill/downstream of the project. They requested that the Commission represent their finding that the materials submitted do not provide sufficient documentation that the submittal satisfies the Town s Stormwater Engineering Review Checklist. This included analysis of: detention requirements; annual volume control/snap tool/curve number calculations; stormwater control measure design and details (e.g., missing calculations for stormwater routing, Filterra sizing, splitter box for level spreader and level spreader sizing, rip rap velocity dissipator); a storm pipe analysis; ephemeral stream calculations at downstream driveway pipe; portions of lots/impervious surfaces draining to stormwater management system. Neighbors of the project also presented information to supplement information they provided prior to the meeting regarding their concerns about the vulnerability of the adjacent properties due to existing flood impacts that have been occurring, echoing the points offered by Mr. Ghosh and Mr. Perry regarding the need for additional documentation, and highlighting that there is no margin for error in the stormwater design, construction, and post construction operation and maintenance. After hearing the above input from the applicant and neighbors and their representatives, the Commission deliberated and prepared review comments that recommended: a re-review of satisfaction of the CUP level Stormwater Engineering Requirements checklist submittal be performed by the Town; and several CUP conditions (drainage of impervious surfaces; peak flow analysis; undisturbed drainage easement for Lot 7) be considered. Lloyd Property Rezoning The SWAC reviewed the rezoning application and recommended that it be affirmed that condition 15 regarding the 50 and 100 year storm events considers the stormwater runoff from the entire site. Adjourn The meeting was adjourned at 11:45 pm. The next meeting will be on October 11th.

3 TOWN OF CARRBORO NORTH CAROLINA TRANSMITTAL: STORMWATER UTILITY DELIVERED VIA: HAND MAIL FAX To: From: Cc: Stormwater Advisory Commission (SWAC) Randy Dodd, Stormwater Utility Manager Joe Guckavan, Public Works Director Heather Holley, Stormwater Specialist Date: November 1, 2018 Subject: Update on Stormwater Activities and Planning for Future Commission Meetings Summary The purpose of this memo is to provide the Stormwater Advisory Commission (SWAC) with an update on recent activities and an overview of upcoming plans for Stormwater Utility staff. The intention is to share information during the transition of the Stormwater Utility from a period of establishment to a longer term operational status and to provide background material to help with the planning of future Commission agendas. Information Carrboro s stormwater program can be described and broken down in different ways, one of which is based on the services that the program offers (see graphic, and Tables 1 and 2). It is important to consider these services not as discrete and separate, but as integrated and coordinated, as facilitated by the administrative role. The placing of the program under the umbrella of a utility and within a dedicated enterprise fund results in the ability to more holistically manage and coordinate the Town s stormwater program. The following briefly summarizes some, but not all, of these services. Stormwater Utility Administration includes developing and implementing program service delivery; stormwater related data management; regulatory tracking and annual reporting; issuing notice of violations; contract administration for contractual services; staffing the Stormwater Advisory Commission; program integration with Town administrative activities (e.g., operating budget and CIP). Stormwater Infrastructure Services include maintenance of the Town-owned stormwater system including inlets, catch basins, pipes, ditches, and Stormwater Control Measures (SCMs);

4 street sweeping; design and construction of public stormwater infrastructure (including green infrastructure) projects, stormwater retrofits, and restoration projects on Town maintained land. Stormwater Planning Services include planning and engineering review and oversight of new development proposals and construction, and updating of the Land Use Ordinance. Stormwater Community Services includes education and outreach, providing public participation opportunities, coordination with the Clean Water Education Partnership (CWEP), and (a) new assistance program(s). Stormwater Field Services include inspections of SCMs issued under a Town land use permit, illicit discharge detection and elimination activities, stream determinations, and stream monitoring. Table 1: Stormwater Services Prior to and With the New Stormwater Utility Stormwater Service Prior to Utility With Utility Administration Legal LUO (Article XVI) and illicit discharge (Town Code) Legal structure for Utility added in Town Code. Programmatic Dispersed program Umbrella program Financial Stormwater expenses not tracked Tracked, under Enterprise Fund Regulatory Responsibility Planning (town wide), Public Works (PW facility) Stormwater Utility Advisory Commission EAB Stormwater Commission Infrastructure MS4 1 and facility maintenance Public Works Public Works: support from Stormwater Utility Green infrastructure Not applicable Stormwater Utility Field Planning Department Stormwater Utility Planning Plan review, erosion control, permitting Planning Department: contract engineering & county support Planning Department: Stormwater Utility, contract engineering & county support SCM Inspection & Planning Department maintenance 2 Community Assistance Not applicable Stormwater Utility Outreach/education Planning Department Stormwater Utility Stormwater Utility (potentially with contract support) All of these services are important for the Stormwater Utility moving forward. In 2018, one priority has been initial steps to establish the administrative mechanisms and capacity to operate a successful utility over the long term. Specifically, the emphasis of Stormwater Utility staff activities in the first half of calendar year 2018 was on maintenance of preexisting stormwater services while also supporting the establishment of a rate structure to provide dedicated stormwater revenue. 1 Municipal separate storm sewer system, or conveyance system 2 This item refers to Stormwater Control Measure inspection and maintenance on private property after development (post construction).

5 Table 2: Overview of Town Staff Current (mid 2018) Major Stormwater Responsibilities Type of Service Responsibility Notes Administrative Launching utility Implementing interlocal billing agreement Stormwater related databases GIS and administrative databases NPDES permit administration Compliance activities, tracking and annual reporting Jordan Lake Rules Compliance tracking, planning, implementation, reporting Town administrative tasks e.g. financial, legal, contractual, cross department coordination Contract administration e.g., benthic monitoring; Public Works facility permit compliance; engineering services Infrastructure Stormwater conveyance system Maintaining catch basins, pipes, ditches, swales and proper disposal of waste from clean-up operations Street sweeping Town operates one vacuum truck Planning Reviewing stormwater plans for Shared by staff and contract engineering firms new development proposals Stormwater Control Measure inspections Historically able to only pursue reactively; preparing to ramp up effort Erosion control Delegated to Orange County; some staff administrative time for coordination Field Implementing buffer requirements in LUO Town s requirements exceed minimum state requirements, which adds to staff workload. Illicit discharge detection Historically able to only pursue reactively; preparing to ramp up effort. Community Benthic monitoring Private property drainage inquiries Staffing new Stormwater Advisory Commission Education and outreach Through contractual support Tracking and providing support with floodplain administration, maintenance of public conveyance system, response to inquiries. Initiated in February, 2018 Participation in the Clean Water Education Partnership. Preparing to ramp up effort. Now that the rate structure has been established, staff have shifted gears to a) implement the rate structure; and b) begin to initiate and prioritize opportunities for service expansion. For the former, this has mainly involved coordination with the Orange County Property Tax Office, and responding to citizen billing inquiries. For the latter, a new staff position was posted in the summer and filled in early September. Two recent activities that have required staff time have been the public review of development projects (principally the Sanderway and Lloyd properties) and preparation and response to tropical storm events in September and October 3. An outcome of the storm response is that a new activity for Utility staff is supporting federal/state flood mitigation grant application and administration. This involves both administration of current grants (two elevation projects for homes on Lorraine Street) and potential future applications. In recent weeks, staff have been tracking anticipated state/federal assistance and grant opportunities 3 Some discussion of response activities was provided in the Commission s October agenda materials

6 and reaching out to residents who may be able to benefit from these opportunities to determine interest in being included in a potential application made by the Town on behalf of residents. Table 3: Overview of New Stormwater Services (Underlined items are recommended for future SWAC agendas) New Service FY 18/19 Future Years Floodplain Grants Administration & application Continue Florence Response Underground Storage Tank spill Preparedness for major storms response; application for public assistance for Public Works facility impacts and a number of conveyance system and private property concerns/inquiries SCM Maintenance Work with SCM owners on self Inspect all SCMs within 5 years inspections and annual reporting; ramp up Town inspections Education and Capstone project(s); updating Expand program Outreach website IDDE program Outfall/dry weather inspections Continue Plan for capital Further compile and prioritize future Implement projects projects Implement Bolin Creek Watershed Restoration Plan Jordan Lake Existing Development Requirements Administration Residential Assistance Program Recommendation projects 4. Review (or in FY 19/20) Review (or in FY 19/20) Implement billing; create/improve record keeping and administrative systems; review residential rate and crediting Provide consultative services Implement projects Implement projects Self and/or State audit(s) Implement administrative updates Create and implement more formal assistance program It is recommended that SWAC members review this memo, contact staff with any questions, and plan to discuss at the November meeting. 4 Recommended for discussion at SWAC December meeting