City of Westfield's Stormwater Program

As part of the 1987 amendments to the federal Clean Water Act (CWA), the United States Congress added Chapter 402(p) to the CWA to address the water quality impacts of storm water discharges from industrial facilities and large to medium municipal separate storm sewer systems (MS4s).  Large to medium MS4s were defined as communities serving populations of 100,000 or more and are regulated by the Environmental Protection Agency (EPA) under the National Pollutant Discharge Elimination System's (NPDES) Storm Water Phase I Program.

In addition to these amendments, Congress directed the Environmental Protection Agency (EPA) to issue further regulations to identify and regulate additional storm water discharges that were considered to be contributing to national water quality impairments.   On December 8, 1999, the EPA issued regulations that expanded the existing NPDES Storm Water Program to include discharges from small MS4s in "urbanized areas" serving populations of less than 100,000 and storm water discharges from construction activities that disturb more than one acre of land.  These regulations are referred to as the NPDES Phase II Storm Water Program.  The urbanized area portion of City of Westfield met these criteria and was consequently designated as an MS4 entity.

In the State of Indiana, the Indiana Department of Environmental Management (IDEM) is responsible for the development and oversight of the NPDES Phase II Program.  The IDEM initiated adoption of the Phase II Rules that were ultimately codified as 327 IAC 15-13 (Rule 13).  Rule 13 became effective on August 6, 2003 and requires designated MS4 entities to apply for permit coverage by submitting a Notice of Intent (NOI) and developing Storm Water Quality Management Plans (SWQMPs) through a phased submittal process.  The IDEM's phased submittal requirements for the SWQMP include the following three components:

Part A: Initial Application
Part B: Baseline Characterization Report
Part C: Program Implementation Plan

All MS4s were required to submit NOI and SWQMP Part A documents to the IDEM by November 5, 2003.  SWQMP Part B and Part C documents were required to be submitted by May 3, 2004 and November 5, 2004, respectively.  City of Westfield's NOI and SWQMP Part A documents were submitted to IDEM on November 5, 2004 and the SWQMP Part B document was submitted to IDEM on May 3, 2003. On August 31, 2004, the City submitted a letter to the IDEM requesting a 90 day extension for submitting their SWQMP Part C.  The extension was granted by IDEM and the City's report is now due on February 2, 2005.

This report has been prepared to address Rule 13 requirements for completing the SWQMP Part C: Program Implementation Report, its corresponding certification form, and certification forms for each of the six Minimum Control Measures (MCMs) for City of Westfield, Indiana.  This report includes the following information:

- An initial evaluation of the storm water program for the City of Westfield MS4 area, including information on all known structural and nonstructural storm water BMPs utilized,
- A detailed program description for each of the six MCMs, including Measurable goals with results that are related to an environmental benefit and Programmatic Indicators,
- A timetable for program implementation milestone, which includes milestones for each of the six MCMs,
SWQMP-Part B: Baseline Characterization Report conclusions (BMP recommendations, additional protective measures for sensitive areas, and correcting identified water quality problems),
- A narrative and mapped description of the MS4 area boundaries that indicate responsible MS4 entity areas for each MCM, including specific boundaries of the MS4 area,
- An estimate of the linear feet of MS4 conveyances within the MS4 area, segregated by MS4 type, including open ditch and pipe,
- A summary of which structural BMP types will be allowed in new development and redevelopment for the MS4 area,
- A summary of the storm water structural BMP selection criteria and, where appropriate, associated performance standards that must be met after installation to indicate  BMP effectiveness, and
- A summary of the current storm water budget, funding source, and a projection of the budget for each year within the five (5) year permit term.


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