Municipal Separate Storm Sewer System Stormwater Management Plan

2026-11-03

The County will contract with the selected respondent to assist in developing draft documents and data for compliance with the DEQ MPDES MS4 General Permit for the next five - year iteration ( 2027 - 2032 ) to consist of the following : 1 . A draft boundary map of the urbanized area within Lewis and Clark County , outside of the incorporated cities , that will be subject to the 2027 - 2032 MPDES MS4 General Permit ; 2 . A draft NOI permit application and supporting application materials ; 3 . Mapping of stormwater components within , or impacted by , the urbanized area . The mapping shall include , at a minimum , waterways , outfall locations , inlets , subsurface conduits / pipes , dry wells , stormwater retention basis , flood mitigation and stormwater discrete conveyances , structures , and features . A GIS / mapping interface capable of both reading a geodatabase map image and feature layers ; 4 . A draft SWMP and plan to support and implement the six Minimum Control Measures ( MCMs ) required under federal and state law : a . Public Education and Outreach ; b . Public Involvement and Participation ; c . Illicit Discharge Detection and Elimination ; d . Construction Site Storm Water Management ; e . Post - Construction Site Storm Water Management ; and f . Pollution Prevention and Good Housekeeping .

Montana

2026-04-29