Erosion and sediment control during construction. Jill Robinson Senior Planner

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1 Erosion and sediment control during construction Jill Robinson Senior Planner

2 Roadmap Reasons for the regulation Anatomy of the regulation What s new Summary

3 Reasons for the regulation During construction, removal of vegetation, root systems, and topsoil compromises the ability of vegetation to: stabilize soil reduce velocity of runoff, shield the surface from rain, and maintain the soil s ability to absorb water Plymouth, NH

5 1) Streambank erosion Alters aquatic habitats and aquatic species life cycle events by increasing turbidity, changing water temperature, and changing the depth of water bodies.

6 2) Alteration of existing drainage patterns

7 3) Destabilization of steep slopes

8 4) Reduced potential for groundwater recharge due to coverage by impervious surfaces or drainage control methods that take stormwater off-site

9 5) Runoff of chemicals and nutrients into water supplies Nutrient runoff in Chesapeake, Va. Nitrogen and phosphorous concentrations can result in accelerated eutrophication and the proliferation of nonnative aquatic plant species.

10 We have the technology

11 The Anatomy of the Regulation

12 Don t reinvent the wheel, but don t steel the hubcap either Peruse the best of models nationwide Consider your unique local conditions, like climate, topography, and town staff resources Think of what you want to accomplish to comply with fed regulations, and also your local goals.

13 Key Sections 1) Authority/Legal Basis RSA 674:44 2) Purpose 3) Findings (the science, or why this is needed) 4) Applicability 5) Definitions 6) Construction Inspections and Phasing 7) Design Standards 8) Construction Site Methods 9) Enforcement 10) Diagrams

14 Authority What s new: Federal law requires small MS4 operators to develop, implement, and enforce a program to reduce pollutants in any storm water runoff from construction activities that result in a land disturbance of greater than or equal to one acre, or less than one acre, if part of a common plan that would disturb one acre or more.

15 Applicability The regulation applies to land disturbance, development or construction activities disturbing greater than 20,000 square feet or that is in a critical area

16 Critical area Disturbed areas of any size within 75 feet of a stream, intermittent stream, bog, water body, or poorly or very poorly drained soils, disturbed areas of any size within 50 feet of a property line, disturbed areas exceeding 2,000 square feet in highly erodible soils, or disturbed areas containing slope lengths exceeding 25 feet on slopes greater than 15 percent

17 Definitions Qualified professional: a person knowledgeable in the principles and practice of stormwater management and control, including: Certified Professional in Erosion and Sediment Control

18 Construction Inspections and Phasing Inspections: initial site inspection, inspection of BMPs, after every storm event, during construction, and final inspection Documentation + photographs Phasing: initial design, schedule of operations, soil erosion control measures, and inspections and maintenance schedule

19 Design Standards and Construction Site Methods Low Impact Development Green Book BMPs (as updated) Pre-construction and pre-winter meetings with town staff, applicant, contractor, site engineer, and town engineer Construction practices Stormwater management plans

20 Enforcement: Dirty Deeds, Done Dirt Cheap

21 Enforcement The key to enforcement is to require periodic inspections, by a qualified professional, at the developer s expense Other remedies as found in the New Hampshire RSAs including cease and desist and revocation of the recorded plan

22 The Reviewers Jack Deering, Michael Redding, Randall Shuey, Joe Farrelly and Chris DeVine PBIC photo

23 Summary Check existing models, model reg by NH Association of Conservation Districts Consider local circumstances Focus on the process for inspections and compliance Seek feedback from reviewers who work in the field

STORMWATER POLLUTION PREVENTION PLAN TEMPLATE. 1.0 SITE DESCRIPTION 1.1 Project Name and Location Date

STORMWATER POLLUTION PREVENTION PLAN TEMPLATE Disclaimer: This template was developed for guidance purposes only in an effort to assist Construction Storm Water permit applicants in meeting state and local