district of columbia sustainability - regulatory update
DESCRIPTION
District of Columbia Sustainability - Regulatory Update. 2013 Final Stormwater Rule Building Code Changes Zoning Changes – Green Area Ration and Minimum Pervious Surface Requirements. 2013 Final Stormwater Rule Restoring District Waterbodies for Residents, Businesses, & Visitors. - PowerPoint PPT PresentationTRANSCRIPT
District of Columbia
Sustainability - Regulatory Update
• 2013 Final Stormwater Rule2013 Final Stormwater Rule
• Building Code ChangesBuilding Code Changes
• Zoning Changes – Green Area Ration Zoning Changes – Green Area Ration and Minimum Pervious Surface and Minimum Pervious Surface RequirementsRequirements
2013 Final Stormwater Rule
Restoring District Waterbodies for Residents,
Businesses, & Visitors
Agriculture, Industrialization, Urbanization Degradation
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Urbanization Stormwater
Imperviousness in the DistrictImperviousness in the District
• 43% of the District’s land area is impervious.
• A single 1.2 inch storm falling on this area produces about 525 million gallons of stormwater runoff.
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Impact on WaterbodiesImpact on Waterbodies
Stormwater washes trash, sediment, oil, grease, pet waste, and other pollutants into District sewers and waterbodies.
Impact on WaterbodiesImpact on WaterbodiesIts sheer volume erodes stream channels, toppling trees, washing sediment downstream, and severely degrading aquatic habitat.
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Impervious Surface Retrofits Impervious Surface Retrofits Retain runoff on site to mimic natural land cover.
Retention BMPs gradually make District “spongier.”
Essential for long-term restoration of waterbodies.
Regulated Development Key to RetrofitsRegulated Development Key to RetrofitsNew SW regs establish retention standards (2013 rule):
• 1.2” storm retention – Projects disturbing 5k SF land.
• 0.8” storm retention – Renovations over certain size & cost.
Most regulated development in District is redevelopment.
Scale of development makes it biggest driver of retrofits.
Gradual transformation of DC’s 43% impervious land cover.
Annual area retrofitted via Annual area retrofitted via DDOE direct investmentDDOE direct investment
Annual area retrofitted under Annual area retrofitted under SW regs (1% of DC land)SW regs (1% of DC land)
10 : 1
Green Roofs
Stormwater Tree and LID Boxes
Rainwater Harvesting Rainwater Harvesting for Non-potable Usesfor Non-potable Uses
Stormwater Retention Credit Trading
Problem of imperviousness provides opportunity for trading.
Flexibility important to achieving acceptance of strong standards.
Trading can maximize triple bottom line of sustainability:• Maximize cost savings & flexibility for regulated sites.• Increase retention and accelerate restoration of
waterbodies.• Increase socioeconomic benefits, with more LID
(health, aesthetics, environmental justice, green jobs).
SRC market may serve as tool for District to achieve retrofits at lower cost and with greater engagement of private sector.
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TradingTrading’’s Potential to Increase Retentions Potential to Increase Retention
Same retention for 1.2Same retention for 1.2”” storm: storm:
10,000 gallons
Strict On-Site Trading
5,000 + 5,000 =10,000 gallons
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Greater retention for storms smaller than 1.2Greater retention for storms smaller than 1.2””Example – 0.6Example – 0.6”” storm: storm:
90% of storms in Washington DC are less than 1.290% of storms in Washington DC are less than 1.2””..This scenario yields 57% increase in annual retention. This scenario yields 57% increase in annual retention.
5,000 gallons
Strict On-Site Trading
5,000 + 5,000 = 10,000 gallons
TradingTrading’’s Potential to Increase Retentions Potential to Increase Retention
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Benefits to District Waterbodies
Increased annual Increased annual retention District-wide.retention District-wide.
Increased capture of first-Increased capture of first-flush volume.flush volume.
Shift retention BMPs to Shift retention BMPs to most vulnerable most vulnerable tributaries and improve tributaries and improve socioeconomic outcomes. socioeconomic outcomes.
Free to go off site after achieving 50% of required retention on site.
Off-Site Flexibility for Regulated Sites Off-Site Flexibility for Regulated Sites
Two off-site options:
• In-lieu fee (ILF) payment to DDOE = $3.50/gallon/year.
• Use of Stormwater Retention Credits (SRCs).
Off-site volume is an ongoing obligation for property.
SRCs can be banked indefinitely.
Purchased SRCs remain valid if generating site fails.
SRCs from anywhere in the District can be used.
Generation of Stormwater Retention Credits DDOE is sole SRC-certifying authority.
DDOE will certify up to 3 years’ worth of SRCs every 3 years for eligible retention capacity.
Retrofit sites not permanently obligated to that use:• No maintenance covenant required.
• Maintenance obligation can be ended by forfeiting SRCs or purchasing replacement SRCs for DDOE to retire.
Retrofits must be maintained for period of SRC certification or until obligation ended.
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Example SRC Transaction Grocery parking lot voluntarily installs 4,000 gal bioretention
to generate 3 years of SRCs or 12,000 SRCs.*
Church parking lot voluntarily installs 2,000 gal bioretention to generate 3 years of SRCs or 6,000 SRCs.
Regulated site has 3,000 gal yearly offsite obligation & purchases total of 18,000 SRCs to comply for 6 years.
By end of 6-year period, regulated site purchases additional credits or pays in-lieu fee.
*Note: Opportunity for discount on stormwater impervious fee provides layered incentive for retrofit.
*SRC value based on projected cost to recoup costs, not market analysis. Costs include capital, maintenance, land, and return on investment.
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Potential Financial ReturnPotential Financial Return
Projected 10-Year Financial Return – Stormwater GI (1.2 in. retention) for 1,000SF Impervious
Discount
Rate 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
10-Year Total
DC Water Max. Discount 4% $5 $6 $8 $10 $11 $12 $13 $14 $15 $15 $107
DDOE Max. Discount 55% $18 $18 $26 $26 $26 $26 $33 $33 $33 $33 $273
Projected SRC Value* $1.25 $888 $917 $949 $981 $1,014 $1,048 $1,083 $1,120 $1,158 $1,197 $10,354
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Transition PlanTransition Plan
Transition Period 1 ends
Final Rule Published
Transition Period 1 180 days
Transition Period 1Transition Period 1 Regulated projects comply with existing regulations.Regulated projects comply with existing regulations. Tied to submittal of first SW Management Plan as part Tied to submittal of first SW Management Plan as part
of building permit application process.of building permit application process.
July 19, 2013 January 15, 2014
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Transition Period 1 ends
Transition Period 2B 545 Days
Final Rule Published
Transition Period 1 180 days
Transition Period 2A 365 Days
Transition Period 2A
ends
Transition Period 2B ends
Transition Period 2A and 2BTransition Period 2A and 2B Minimum on-site retention requirement waived.Minimum on-site retention requirement waived. Entire retention volume may be achieved off site.Entire retention volume may be achieved off site.
July 19, 2013 January 15, 2014
January 15, 2015
July 14, 2015
Transition PlanTransition Plan
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Fully Effective – Except:1) Certain projects (“Advanced Design”) with unexpired approval by
Zoning Com. or NCPC - Subject to TP when application submitted.
2) Additional grounds for on-site relief for projects with unexpired approval (from HPRB, CFA, BZA, DCOP, NCPC) that conflicts with on-site BMP – If application submitted prior to end of TP2A/TP2B.
Transition Period 1 ends
Transition Period 2B 545 Days
Final Rule Published
Transition Period 1 180 days
Fully effective for Major Land Disturbing Activities
Transition Period 2A 365 Days
Fully effective for Major Substantial
Improvements
Transition Period 2A
ends
Transition Period 2B ends
January 15, 2014
January 15, 2015
July 14, 2015
Transition PlanTransition Plan
Greening the District’s Building Codes
Goals
Green the construction code to the maximum extent practicable.
Codify the best practices currently followed by green building leaders in the District.
Compliance Paths
Green Building Act Int’l Green Construction Code (IgCC) ASHRAE 189.1 LEED Green Communities National Green Building Standard
Code Summary - Scope
Covers all commercial projects (10,000 SF and larger)
Covers multi-family residential 4 stories and larger (and 10,000 SF and larger)
Transitory Provisions for the Revised Codes
Exceptions (Section 123 Building Code)
Projects with existing building permits
Projects with existing design contracts or existing filed application
Tenant layout permits for previously built Core and Shell buildings
GREEN AREA RATIOREGULATION
Green Area RatioWhat is it? A flexible green site
design requirement that varies by zone.
How Achieve? Choose from a range of
environmental landscaping practices each of which have been assigned an environmental performance ranking.
Examples may include… Impermeable pavement Impermeable roof Un-vegetated permeable
pavement Vegetated permeable pavement Green roofs Natural ground cover Rain gardens Trees & shrubs Green facades
GAR: How Does it Work?
How to calculate: Add up landscape elements
by number or size # trees Size of green roof Size of rain garden # of plants Soil depths
Divide by lot area
= GAR score
Pervious surface requirements
Landscaping for parking lots
RELATED ZONING REQUIREMENTS
Pervious Surface Requirements
In zones R-1 through R-4 Applies when increasing existing lot occupancy by 10%+
or 25%+ for historic structures Pervious = grass; mulched groundcover; plants; trees;
permeable pavers; and decks or porches
Landscaping for Surface Parking
Minimum 10% of lot landscaped Landscape end islands of 9+ spaces Trees must be min. 2.5” dbh at planting Plant 4’ from protective barriers Special exceptions if impracticable
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QUESTIONS?QUESTIONS?Jeff SeltzerJeff Seltzer
To download the District’s Final Rule and Stormwater Management Guidebook, To download the District’s Final Rule and Stormwater Management Guidebook, & related resources, visit:& related resources, visit:
ddoe.dc.gov/swregsddoe.dc.gov/swregs
For additional information on the Green Area Ratio visit:For additional information on the Green Area Ratio visit:
ddoe.dc.gov/garddoe.dc.gov/gar
For additional information on the Green Building Codes:For additional information on the Green Building Codes:
ddoe.dc.gov/greenbuildingsddoe.dc.gov/greenbuildings