impending stormwater compliance lid_stor… · 2/27/2015 6 municipal stormwater regulations ms4...
TRANSCRIPT
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ImpendingStormwater Compliance
for Contractors & Developers
P t d TPresented To:
Humboldt Builder’s Exchange
February 27, 2014
Presented By:
Streamline Planning Consultants
Sam Polly, CPESC, QSD/QSP
Bob Brown, AICP 2
• Water Quality Regulation Overview• The New MS4 Regulations• CalculationsLID Pl i L
Topics Covered
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• LID Planning LessonsLearned
MS4 = Municipal Separate Storm Sewer System (A municipality)
Polluted Runoff
Polluted Runoff is the #1 Polluted Runoff is the #1 Water Quality Problem Water Quality Problem in California & the U.Sin California & the U.S. .
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(U.S. EPA)(U.S. EPA)
The only purpose of a street gutter/ storm drain is to put pollutants into our streams.
Old School New School
Managing Stormwater
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• Traditional Stormwater Management = “Gray Infrastructure”Collection, Conveyance, Discharge
Approaches to Stormwater Management
• Low Impact Development
= “Green Infrastructure”
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Today’s Problem
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Today’s Problem
• Bad Attitude?• Working in the Rain? Sediment
• Cleaning his Sprayer at the
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Sprayer at the Storm Drain Inlet? Water soluble?
• Downspout extension to curb hole
The Current Regulatory Climate:Avoid this scene
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The Current Regulatory Climate:Avoid this kind of mail
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The Current Regulatory Climate:Stormwater
• CWA & Porter Cologne – everyone is liable regardless of permit
• Agriculture ‐ dairies & now vineyards, livestock, lilies• Industrial ‐ SIC Codes such as creameries, contractor
yards asphalt plants wood workers
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yards, asphalt plants, wood workers…• Construction ‐ > 1 acre disturbed• MS4 – ≥2,500 ft2 will now have stormwater requirements
July 1, 2015
• What does this mean?– Confusion for everyone: 289 pgs, 76 p. fact sheet– Additional costs/ Potential development size reduction
Municipal Stormwater RegulationsPhase II Small MS4 General Permit
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– Increased building permit difficulties – Transparency of municipalities to the whole world– So municipalities MUST strictly enforce MS4 regulations
– Plans & projects MUST be in compliance for building permits, occupancy, profit & reputation
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Practice Tip #1 Get you building permit approvals before July 1st
– What happens if you submit an application on June 15th and it gets turned back for corrections
Municipal Stormwater RegulationsPhase II Small MS4 General Permit
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gon June 30th?
– After July 1st, get pre‐application consultation– After July 1st, prepare SWCP (Storm Water Control Plan)
Whose watching?• California State Water Resources Control Board• Regional Water Resources Control BoardL l M i i lit ( )
Municipal Stormwater RegulationsPhase II Small MS4 General Permit
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• Local Municipality (Permittee) • Neighbors• 3rd Party Watchdog Groups • & Lawyers
Whose in? – Larger urban areas– Cities:
• City Limits of: Fortuna, Eureka, Arcata• Smaller polygon within city limits: Trinidad
Municipal Stormwater RegulationsPhase II Small MS4 General Permit
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– County:• Unincorporated town: McKinleyville• Resort Improvement District: Shelter Cove• Communities surrounding Eureka: Bayview, Cutten, Ridgewood Heights, Humboldt Hill, Myrtletown
– Others: School Districts, HSU, State Parks, etc.
• Whose out? – Smaller urban areas– Towns: Manilla, Samoa, King Salmon, Fields Landing, Willow Creek, Rio Dell, GarbervilleRural Neighborhoods & woods: Areas outside the
Municipal Stormwater RegulationsPhase II Small MS4 General Permit
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– Rural Neighborhoods & woods: Areas outside the MS4 Permit boundary maps
Municipal Stormwater RegulationsPhase II Small MS4 General Permit
SMARTS
SMARTS Webpage: Scroll down…
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Municipal Stormwater RegulationsPhase II Small MS4 General Permit
Click here!
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Click Here
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Municipal Stormwater RegulationsPhase II Small MS4 General Permit
After clicking the SW Data box, Scroll down again to:
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Municipal Stormwater RegulationsPhase II Small MS4 General Permit
After clicking the Search for Owners/Operators, use the dropdown menu for the Application Type and fill in the Owner, then click the Search box:
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Municipal Stormwater RegulationsPhase II Small MS4 General Permit
Click View Attachments:
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Municipal Stormwater RegulationsPhase II Small MS4 General Permit
Click Facility/Site Map:
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H u m b o l d t B a y
J G
HK
E FPALCOMARSH
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City of Eureka: MS4 Jurisdiction
23Figure 2- Drainage Basins &Stormwater Outfall Locations
Drainage Basin Boundaries
CB
A M
Legend
Outfalls
Storm Drain Sewer Mains
O City Boundary
BASINA
B
C
D
E
F
G
H
I
J
K
L
M
O
PALCOMARSH
24County of Humboldt: MS4 Jurisdiction
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City of Fortuna: MS4 Jurisdiction
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City of Arcata: MS4 Jurisdiction
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27City of Trinidad: MS4 Jurisdiction
Municipal Stormwater RegulationsMS4 Permit Requirements
• Small Projects– 2,500 to 5,000 ft2 of replaced or created impervious surfaceSingle family home projects ≥ 2 500 ft2
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– Single family home projects ≥ 2,500 ft2
– Must use 1 or more Site Design Measure (SDM)– Must quantify runoff reduction from SDMs
Practice Tip #2– Keep your new or remodel projects (impermeable surfaces of building, driveways, parking, etc) to less than 2,500 s.f.
Municipal Stormwater RegulationsPhase II Small MS4 General Permit
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,– Design so minimal impervious surfaces. ‘Cut corners’ where you can.
Municipal Stormwater RegulationsMS4 Permit Requirements
• Regulated Projects– ≥ 5,000 ft2 of replaced or created impervious surface– Single family home projects excluded– Must use maximum Site Design Measures (SDMs)
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Must use maximum Site Design Measures (SDMs)– Must incorporate Source Controls– Must use LID Design Standards for maximum runoff reduction and to treat remaining runoff
– Must quantify runoff reduction– Annual reports demonstrating proper O&M
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Municipal Stormwater RegulationsMS4 Permit Requirements
• Regulated Projects ‐ LID Design Standards– ≥ 5,000 ft2 of replaced or created impervious surface– Perform Site Assessment – quantify runoff reduction– Map Drainage Management Areas (DMAs)
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– Employ Numeric Sizing Criteria of the 85th percentile, 24‐hour runoff volume (0.65”)
– Must use maximum Site Design Measures (SDMs)– Must incorporate Source Controls– Must treat the remaining 85th percentile runoff using “Bioretention”
Municipal Stormwater RegulationsMS4 Permit Requirements
• Regulated Projects – Operation & Maintenance:Post‐Construction Storm Water Management Measures– Project proponent’s signed statement of responsibility
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for O&M until legally transferred or,– Written conditions in sales/lease agreements/deeds requiring buyer or lessee responsibility until legally transferred
– Conditions of approval, etc. granting site access to Permittee for O&M inspections
Municipal Stormwater RegulationsMS4 Permit Requirements
• Regulated Projects – Condition Assessment:Post‐Construction Storm Water Management Measures
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– Annual reports to jurisdictional Permittee
Practice Tip #3– Keep your new or remodel projects (impermeable surfaces of building, driveways, parking, etc) to less than 5000 s.f.
Municipal Stormwater RegulationsPhase II Small MS4 General Permit
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– Design so minimal impervious surfaces. ‘Cut corners’ where you can.
Practice Tip #4– Design your new or remodel projects (impermeable surfaces of building, driveways, parking, etc) so that each DMA drains to large
Municipal Stormwater RegulationsPhase II Small MS4 General Permit
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p g, ) genough landscape area.
– This requires shifting project on lot, regradingdriveway features, reconsider downspout locations
Municipal Stormwater Calculations
• Regulated Projects – Runoff CalculationRequirement– Increase >50% impervious on redevelopment then Ronoff from ALL (existing + new) impervious is
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Ronoff from ALL (existing + new) impervious is included;
– <50% increase = only the new impervious is included in calculations
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Municipal Stormwater Calculations
• Methods– Dictated by local jurisdiction
– Local LID ManualC l l t
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– Calculator– Manual
– Each method has advantages and drawbacks
Residential
16,500 sf lot
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Residential
16,500 sf lotResidence 4000 s.f.Concrete 4000 s.f.Imp. Surface: 8000 s.f.Landscaping 8500 s.f.
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Residential
Current Practice:•Grade the lot so you can get all stormwater to driveway and out
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onto street
Residential DMA’s
MS4 Requirement•Minimize Disturbed area•Minimize Impervious surfaces•Design Grading Plan
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•Design roof downspouts•Define DMA’s•Perform Calculations•Add Site Design Measures
DMA = Drainage Management Area
Residential DMA’s
DMA CalculationDMA = Drainage Management Area
DMARoof (sf)
Concrete (sf)
Landscape (sf)
Total (sf)
1 700 800 200 1700
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2 900 1800 900 3600
3 1700 0 4100 5800
4 700 1400 3300 5400
Total 4000 4000 8500 16500
DMA = Drainage Management Area
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Residential DMA’s
DMA CalculationDMA = Drainage Management Area
DMA Roof (sf) Concrete (sf) Landscape (sf) Total (sf)
1 700 800 200 1700
1500/2 (need 750) short 550
2 900 1800 900 3600
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2 900 1800 900 3600
2700/2 (need 1350) short 450
3 1700 0 4100 5800
1700/2 (need 850)extra 3250
4 700 1400 3300 5400
2100/2 (need 1050)extra 2150
total 4000 4000 8500 16500
DMA = Drainage Management Area
Residential DMA’s
Site Design Measures•Rain Garden•Bioswale•Permeable Pavement•Trees
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•Rain Barrels•Etc
DMA = Drainage Management Area
BioretentionRain Gardens and Vegetated Swales
By Timothy Lawrence45
Rain Gardens and Vegetated Swales
• Rain Garden
By Timothy Lawrence46
Vegetated Bioswales
Parking Lots
• Curb cuts drain roadways into ylandscaped LID
Bioretention Area Cross-section
By Timothy Lawrence 48
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DMA’s for Commercial or Multifamily
49DMA = Drainage Management Area
Practice Tip #5 for Projects > 5000 sf (Regulated Projects)
– Bioretention may be worth it. 10,000 sf of impervious requires 400 sf bioretention.
Municipal Stormwater RegulationsPhase II Small MS4 General Permit
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p q– Bioretention requires recording of O&M agreement on deed and submittal of annual O&M reports.
– Bioretention may not be worth it.
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Drainage Management Areas
• Step 1: Delineate the DMAs
• Step 2: Classify the DMAs
Page
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Drainage Management Areas Tabulation and CalculationsAreas draining to self‐retaining areas
DMA Square Feet
Surface RunoffFactor
Product Receiving DMA
ReceivingDMA Area
Ratio
8 1822 Roof 1.0 1822 DMA-7 79819 1712 Roof 1.0 1712 DMA-7 798110 2558 Roof 1.0 2588 DMA-7 7981∑ 6092 7981 0.76
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Municipal Stormwater Calculatorhttp://owp‐web1.saclink.csus.edu/LIDTool/Start.aspx
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Municipal Stormwater Calculator
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Practice Tip #6 for Projects > 5000 sf (Regulated Projects)
– If using a generalized web soil map, check your site’s soil to avoid excess Site Design Measures
Municipal Stormwater RegulationsPhase II Small MS4 General Permit
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Municipal Stormwater Calculator0.16 ac = 6,970 ft2
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Municipal Stormwater Calculator
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One 55 gal rain barrel = 7.35 ft3 so multiply by 4 barrels = 29.4 ft3 = 22.4% reduction;Remaining 77.6% x 325ft2 = 252.2ft2 Amended Strip 18” deep (16’x16’ or 5’x50’)
Practice Tip #7 for Projects > 5000 sf (Regulated Projects)
– Consider available space versus up front cost & long‐term maintenance
Municipal Stormwater RegulationsPhase II Small MS4 General Permit
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g
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Municipal Stormwater RegulationsInterpretations
• Permit Goals vs. Manual Standards– E.12.e.(ii)(f)3)…minimum infiltration rate of 5 inches per hour…
– E.12.e.(ii)(f)3)… A mixture of sand (60%‐70%)…and
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compost (30%‐40%) may be used.– Really?
Municipal Stormwater RegulationsInterpretations
• Permit Goals vs. Manual Standards– What’s really sustainable and what works on the ground
– E.12.e.(ii)(f)…The facilities must be demonstrated
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to be at least as effective as a bioretentionsystem with the following design parameters:
– Doesn’t say “must have the following parameters”– E.12.e.(ii)(f)8) “Appropriate plant palette for the specified mix…” implies different mixes
Practice Tip #8 for Projects > 5000 sf (Regulated Projects)
– If the local jurisdiction allows, assess your soils before resorting to bioretention; an engineered
Municipal Stormwater RegulationsFlexibility
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g ; gsoil mix and associated impacts may be unnecessary
Microbes eat toxins for breakfast!
LID – What’s the Point
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Microbes eat hydrocarbons for lunch!
LID – What’s the Point
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LID – Creating a toxin-eating ecosystem
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Design Considerations and Requirements Considerations
• Irrigation? Soil, Compost/Mulch, Plant Type, Planting Season
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Design Considerations and Requirements Considerations
• Compaction– Surrounding Project Construction/Engineering
– Equipment within LID feature
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Design Considerations and Requirements Considerations
Follow local climate cycles ‐Native plants have dormant cycles
“Brown is the New Green”
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Cosumnes Elementary,Sloughouse, CAPhoto Courtesy of Delta Bluegrass
Practice Tip #9– Waterboard Intent = Development mimics natural landscape and ecosystem to reduce runoff and pollution
Municipal Stormwater RegulationsPhase II Small MS4 General Permit
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p– Maximize soil‐plant‐microbial systems
Questions? ….No?
Waterboard• [email protected]• (866) 563‐3107
Streamline Planning• [email protected]• [email protected]• (707) 822‐5785
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BioretentionRain Gardens and Vegetated Swales
• Rain Garden
By Timothy Lawrence73
Pervious Concrete
• Minimize stormwater runoff• Reduce need for storm drain systems• Provide filtration of pollutants• Increase infiltration to groundwaterE li i t ddl !
Pervious Pavement
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Permeable Pavers
Reinforced Grass
• Even eliminate puddles!
Rain Barrels/Cisterns
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Design Considerations and Requirements Soils and Plants
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Where are the Roots?
Roots: Perennial vs. Annual