Stormwater Mapping and Illicit Discharge Detection and Elimination Program
In 2000 the Vermont Legislature required the Department of Environmental Conservation (VTDEC) to implement a statewide program to promote detection and elimination of improper or illegal connections and discharges. (Sec. 3. 10 V.S.A. § 1264 (b)(9)). Illicit discharges are discharges of wastewater or industrial process water into a stormwater only drainage system. The legislature's intent was to expand illicit discharge detection and elimination (IDDE) efforts from the communities—all in the greater Burlington area—required to perform IDDE in compliance with the Environmental Protection Agency's Phase II Stormwater Rule to encompass all developed areas of the Vermont. Following the legislature's mandate, VTDEC has assisted municipalities not subject to the Phase II Stormwater Rule by mapping drainage systems and performing IDDE. This work, funded through grants from the state Clean & Clear/Ecosystem Restoration Program, USEPA Section 319 and the Lake Champlain Basin Program, has been completed for all major urbanized areas in the Missisquoi, Lamoille, lower Winooski (outside the greater Burlington area), Otter, Poultney River Basins and the three largest Connecticut River Basin towns and is ongoing in the Lake Memphremagog, Upper Winooski, White and Black River Basins and in the Town of St Johnsbury. About eighty communities have had GIS (Geographic Information System) drainage maps completed. Stone Environmental, Watershed Consulting Associates and Aldrich-Elliott Engineers in conjunction with several watershed associations (Friends of the Winooski River and Friends of the Mad River) have or are currently conducting IDDE surveys in sixty-five non-designated MS4 communities. Consultants have identified 2078 discharge points, about 700 of which were flowing when inspected. A wastewater source was indicated at 153 discharge points. Other types of contamination included petroleum (16 locations), treated drinking water (42 locations), heated water, pet and septic waste, paint and road salt. By combining drainage mapping, environmental investigative work, and municipal cooperation, this effort has eliminated numerous wastewater discharges, decreasing phosphorus by an estimated 200 kg per year to Lake Champlain, and reducing the risk of pathogen exposure.
Status of Stormwater Mapping Project - March 2014:
Status of Illicit Discharge Detection and Elimination Project - March 2014:
Stormwater Infrastructure Data Availability:
The geographic information systems stormwater infrastructure data used in these reports is available for download thru the Vermont Center for Geographic Information Systems (http://www.vcgi.org/). Please note that the VCGI database is updated once per year with data collected in the preceding year so some data illustrated in these reports may not be available thru VCGI. All data used in these reports is available also from the VTDEC Ecosystem Restoration Section.
Presentation - March 2011:
Presentation -October 2012:
Barton, Brighton, Derby, Newport, and Orleans (4.1MB PDF)
Revised: July, 2014
VT DEC Watershed Management Division 1 National Life Drive, Main 2 Montpelier, VT 05620-3522 Tele: 802-828-1535 Fax: 802-828-1544
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