2010 Stormwater Management Report (PDF) - US Environmental ...

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4.0 REPRESENTATIVE AND RECEIVING WATER MONITORING, AND BMP DEMONSTRATION PROGRAMS 4.1 PREVIOUSLY COMPLETED MONITORING PROGRAMS Under the permit, the Commission was required to monitor stormwater quality in areas representative of different land uses and receiving water quality during wet weather. The Commission was also required to implement a demonstration program designed to evaluate the effectiveness of a non-structural stormwater Best Management Practice. The Commission completed all of the required monitoring and the demonstration program within the first five years of the permit. In 2004, because there were funds remaining in the monitoring program contract, the Commission extended the contract duration, and an additional round of receiving water monitoring was performed in 2005. In 2006, the Commission extended the monitoring program contract again, and added $10,039 to the contract, to allow for one more year of receiving water monitoring. In total, the Commission completed six years of receiving water monitoring. In 2007, anticipating that the Commission’s permit would soon be re-issued by EPA/DEP, the Commission sent a letter to EPA/DEP stating that it had fulfilled all of the monitoring requirements of the existing permit and there were no immediate plans to continue representative and receiving water monitoring. Since there was no response from EPA or DEP regarding the letter, it was concluded that this was acceptable to EPA and DEP. Description of the monitoring programs and the BMP Demonstration program were reported in previous Stormwater Management Reports. 4.2 2010 STORMWATER MONITORING PROGRAM In 2010, the Commission monitored stormwater discharges from representative drainage areas and receiving waters. The same three (3) representative areas and the same five (5) sample sites within three (3) receiving water bodies were sampled as in the previous monitoring program, during three (3) storm events. The purpose of the monitoring was to determine if there was any change in the concentration of pollutants over time, and to try to determine pollutant sources. The stormwater monitoring program was completed towards the end of 2010 and the data and results are currently being compiled and analyzed. A final report is expected to be completed by the end of April 2011. 4 - 1
5.0 PROGRAM MODIFICATIONS Numerous modifications were made to the Commission’s stormwater programs over the last ten years. These modifications were described in previous annual Stormwater Management Reports and are summarized below. This section also describes any additional changes now being proposed. 5.1 STORMWATER MANAGEMENT PROGRAM It is the position of the Commission that its current Stormwater Management Plan and practices are effective in reducing pollutants to the maximum extent practicable. No modifications were proposed in 2010. The Commission expects to award a three (3) year Wastewater and Stormwater Facilities Plan Study in early 2011. The study will include a review of the Commission’s current Stormwater Management Plan, as well as applicable Best Management Practices. 5.2 OUTFALL SCREENING a. Dry Weather Outfall Screening of Storm Drain Outfalls During the 1999-2004 permit term, the Commission completed screening of its major outfalls in accordance with the permit requirements. The results of the 1999-2004 field screening was presented in previous annual reports. The Commission completed dry weather screening of all of its outfalls (major and nonmajor) towards the end of 2010. The data is currently being verified and compiled. A report on the results and findings of the 2010 outfall screening is expected to be completed by the end of April, 2011. b. Wet Weather Outfall Screening of Storm Drain Outfalls The Commission performed wet weather screening of 24 outfalls in 2000, 15 of which were 36-inches in diameter or larger. No odor was detected in any of the outfalls screened. Clarity of the flow was cloudy or opaque in 17 cases. These observations are fairly typical for stormwater discharges. Evidence of an illegal connection was observed during wet weather screening at one outfall. However, the evidence observed (white chalky marks on the outfall walls) would have been equally visible during a dry weather inspection. 5 - 1
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2010 Stormwater Management Report B
Page 6 and 7:
TABLE OF CONTENTS (cont.) 5.0 PROGR
Page 8 and 9:
1.0 INTRODUCTION 1.1 PERMIT HISTORY
Page 10 and 11:
oadways, roadway maintenance, const
Page 12 and 13:
Table 1-1 BWSC Stormwater Outfalls
Page 14 and 15:
Table 1-2 Drainage Areas to Outfall
Page 16 and 17: 2.0 ILLEGAL CONNECTION REMEDIATION
Page 18 and 19: Because upstream contamination sour
Page 20 and 21: Table 2-1 Drainage Area Investigati
Page 22 and 23: Table 2-1 Drainage Area Investigati
Page 24 and 25: The Commission estimates the wastew
Page 26 and 27: January 2011 BOSTON WATER AND SEWER
Page 28 and 29: January 2011 BOSTON WATER AND SEWER
Page 30 and 31: 3.0 STORMWATER MANAGEMENT ACTIVITIE
Page 32 and 33: Table 3 - 1 Brook Inlet and Outlet
Page 34 and 35: Table 3 - 2 BWSC Particle Separator
Page 36 and 37: 3.2 CONTROL OF NON-STORMWATER DISCH
Page 38 and 39: Table 3 - 3 Spill/Dumping Response
Page 40 and 41: Table 3 - 3 Spill/Dumping Response
Page 42 and 43: g. Yard Waste/Composting The Boston
Page 44 and 45: In 2010, the Commission approved 18
Page 46 and 47: Table 3 - 4 Private Infiltration De
Page 48 and 49: Table 3 - 5 Privately Installed Par
Page 50 and 51: and that negative impacts to stormw
Page 52 and 53: The composition of the material swe
Page 54 and 55: The Catch Basin Stenciling Program
Page 57 and 58: Vincent G. Mannering, Executive Dir
Page 63 and 64: The City of Boston’s dog fouling
Page 65: DON’T DUMP! A catch basin dumping
Page 71 and 72: 6.0 FINANCING STORMWATER MANAGEMENT
Page 73 and 74: These costs do not include the cost
Page 75 and 76: 8.0 WATER QUALITY IMPROVEMENTS The
Page 77 and 78: 9.0 ASSESSMENT OF STRUCTURAL CONTRO
Page 79: Table 9 - 1 2010 Particle Separator
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