CLEAN WATER SERVICES DESIGN & CONSTRUCTION STANDARDS Public - - PowerPoint PPT Presentation

CLEAN WATER SERVICES DESIGN & CONSTRUCTION STANDARDS

January 26, 2017 Damon Reische, Development Services Division Manager

Public Meeting

WHY UPDATE D&C NOW?

Permit Issuance

April 22 , 2016

1

st

Anniversary

April 2017

2

nd

Anniversary

April 2018

3

rd

Anniversary

April 2019

1,000 SF Treatment Threshold

Time Permit Requirement

LIDA PrioriAzaAon Implement HydromodificaAon Plan Phase 1 Phase 2

• Ch. 1
• Ch. 4
• Ch. 2
• Ch. 6

What topics are included in Phase 1 Draft Standards?

Stormwater

• 1,000 SF treatment threshold
• LIDA incentives
• Redevelopment Table 4-1
• Storm Master Planning
• Turf fields with underdrains
• Planting requirements for WQ

Facilities

Erosion Control

• Erosion Control Permit Threshold
• BMPs for stream/wetland

restoration projects Sanitary

• Sanitary Conveyance from Private System
• Storm Connections to Sanitary

(example: trash enclosures, wash pads)

• Procedural (Housekeeping)
• Update 1200C/CN language
• Maintenance Plans
• 2-Year Maintenance Period for Filter Vaults
• LIDA Lot Submittal Requirements
• Approved Product List
• Model Homes
• Update Standard Details
• Typo and Reference Corrections
• Definitions Related to Updated Topics

What topics are included in Phase 1 Draft Standards?

• Chapter 1 Definitions

§ Add & clarify existing definitions

• Chapter 2 Administrative Procedures

§ Erosion control permit threshold § 1200-CN references § Clarify maintenance requirements § Submittal requirements for Model Homes, “LIDA lots,” construction on single family residential lots

• Chapter 4 Runoff Treatment & Control

§ 1,000 SF treatment threshold § LIDA prioritization § Redevelopment

• Chapter 6 Erosion Prevention &

Sediment Control

§ Require supplemental plans to address:

v Runoff control during wet weather v Dewatering v Concrete treatment of soils

§ Reference to stream and wetland restoration BMPs § Reference to 1200-CN § Protocol for use of chitosan

• Appendix B Standard Details

§ Update & standardize formatting § Minor content changes

Public Review Process

• Release drafts in sections
• Format- redline revisions with

explanatory reader notes

• Conceptual language released for

initial public review

• Legal review in coming months
• Formal public review to follow
• Stakeholder input welcome at any

time

CHAPTER 4: UPDATE & NEXT STEPS

• January 6th

§ Initial Draft of Chapter 4 posted § Distributed to email List Serve § Available on CWS website

• January 20th

§ Date comments are requested § However, accepted at any time

• January 26th

§ Public meeting scheduled

• CHAP. 6: EROSION PREVENTION & SEDIMENT CONTROL
• January 18

§ Initial draft of Chapter 6 posted § Distributed to email list § Available on CWS website

• January 26

§ Public meeting scheduled

• February 3

§ Date comments are requested § However, accepted at any time

Standard Details

CHAPTER 4: RUNOFF TREATMENT AND CONTROL

• 3 Key Topics

§ 1,000 SF treatment threshold § LIDA/GI prioritization § Redevelopment

• General

§ Desire for clear and objective Standards § Create a “decision tree” or sizing tool § Consider impact to buildable area (LIDA) § Consider physical and fiscal constraints § Continue to allow option to “trade” treatment area

§ Consider exemptions for certain activities (ADA upgrades, other?)

• Redevelopment

§ Ratio options are preferable for simplicity § Incentivize net reduction in impervious area (no penalty for removing impervious) § Resolve treatment issues for small projects on large sites. § Resolve confusion when a project is reviewed as ‘development’ or ‘redevelopment’

Stakeholder Input Addressed in Initial Chapter 4 Draft

Initial DRAFT of Chapter 4: Runoff Treatment and Control.

Interim draft; contains conceptual language addressing the following:

§ Treatment requirement for all development creating or modifying 1,000 SF or more of impervious area, including single family construction and partitions. § Language to address the new permit requirement to prioritize Green Infrastructure and Low Impact Development Approaches (LIDA). § Methodology to calculate treatment requirements that consolidates development and redevelopment into a single section. § General housekeeping changes, including changing the term "facility" to "approach" for water quality treatment types.

Initial DRAFT of Chapter 4: Runoff Treatment and Control.

The Initial Chapter 4 draft also included:

§ An analysis of the Table 4-1 alternatives § New water quality treatment calculator (Figure 4-1).

New Language LIDA

• All development required some LIDA or GI
• List documenting approved approaches
• CWS has been requiring some form of LIDA for years

including Swales, buffer strips and riparian restoration

• Evaluated during site planning
• Reality important aspect – thresholds – have not been

defined for all of treatments e.g. 1 tree and canopy cover has not been defined (1 tree, areal coverage, ?)

LIDA & Green Infrastructure Prioritization Concept

• Treatment Approaches

§ Vegetated Swale § Extended Dry Basin § Constructed Water Quality Wetland § Structural Infiltration Planter § Flow-Through Planter § LIDA Swale § Street-Side Planter § Landscape Filter Strip § Non-structural infiltration planter § Vegetated Corridor as a Filter Strip § Proprietary Treatment Systems

• Green Infrastructure

§ Upland Tree Preservation § Vegetated Corridor Preservation § Minimize impervious area: green roofs, green walls, porous pavement, boardwalks § Rainwater catchment and harvesting systems for re-use § Parking minimization: compact parking spaces, shared parking (on-street, shared lots, public lots), underground or stacked parking § Lawn conversions to native landscaping § LIDA for water quality treatment

WHATS NEXT?

• January

§ Distribute Chapters 1, 2, 6 and details to the public § Review public comments § Jan. 26th Stakeholder Meeting

• February

§ Feb. 8th CWAC meeting § Prepare full draft of proposed Standards § Legal review

• March

§ Public Notice § Board Hearing

Key Topic: Treatment Threshold

• Question
• Comments
• Documents

CHAPTER 4: RUNOFF TREATMENT AND CONTROL

Key Topic: LIDA/GI Prioritization

• Question
• Comments
• Documents

CHAPTER 4: RUNOFF TREATMENT AND CONTROL

Key Topic: Redevelopment

• Question
• Comments
• Documents

CHAPTER 4: RUNOFF TREATMENT AND CONTROL

• Question
• Comments
• Documents

CHAPTER 6: EROSION PREVENTION AND SEDIMENT CONTROL

• Question
• Comments
• Documents

APPENDIX B: DETAILS

HOW TO STAY INVOLVED IN THE PROCESS

• Check out the D&C Update Webpage

cleanwaterservices.org/dncupdate

• Get on the Email List (link on webpage)
• Submit comments or questions

DnCupdate@cleanwaterservices.org

INPUT ON KEY TOPIC DRAFT UPDATES

• 1,000 SF treatment threshold

§ Exempt ADA projects (such as sidewalk ramp retrofits) by defining them as maintenance. § The changes to the on-site treatment criteria used to determine fee-in-lieu eligibility are too broad. § Revise fee-in-lieu amount for small sites on the cost of a more typical LIDA – such as flow-through planter. § Add a provision to the on-site treatment criteria that allows for treating adjacent or nearby equivalent amount

v Currently specified in 4.05.4 (a)

INPUT ON KEY TOPIC DRAFT UPDATES

• LIDA/GI prioritization

§ Modify thresholds so that they are above and beyond land use code requirements.

v Intent of updates is to incorporate green infrastructure options

currently available through land use code requirements.

§ Concern that land use codes may not have sufficient provisions for these approaches, or may contradict these approaches and that a fee-in-lieu should be available. § Quantify performance criteria for the GI approaches

INPUT ON KEY TOPIC DRAFT UPDATES

• Redevelopment

§ Equivalent level of support for the ‘modified’ and ‘simplified’ approaches § In calculator, state at top that treatment is not requirement for projects that only remove impervious area.