1. science
2. ecology
3. pollution

Terri Fashing, MCSTOPPP Program Manager
Presentation to the North Bay Watershed Association Board, July 11,
2014
POST CONSTRUCTION
MANUAL PROJECT
UPDATE
Project Partners



North Bay Watershed Association Board
North Bay Watershed Association Joint
Technical Committee
Bay Area Stormwater Agencies Association
(BASMAA) Phase II Committee
 Marin
County Stormwater Pollution Prevention
Program
 Napa County Stormwater Pollution Prevention
Program
 Phase II Municipalities in Sonoma (and SCWA!)
 Phase II Municipalities in Solano

Dan Cloak Environmental Consulting
Thanks to NBWA!

2011-2013 State Water Board worked on reissuing the
NPDES Phase II Permit



Compliance Collaboration: North Bay municipal permittees





New post construction stormwater treatment and control
requirements
February 2013 – NPDES Phase II Municipal Stormwater Permit
adopted
Update existing MCSTOPPP Post Construction Manual
Early 2013: North Bay Watershed Association (NBWA) Joint
Technical Committee reviewed/approved the proposed
project
2013: NBWA Board approved the project funds
NBWA Executive Director and MMWD executed a contract
with Dan Cloak Environmental Consulting
August 2013: Post Construction Project kickoff meeting in
Project Description


Planning meetings
Develop guidance manual to support
compliance with Section E.12 of the Phase II
Permit for:
 Applicants
for Development Approvals
 North Bay Municipal Staff

Hold three half-day workshops for
development professionals and municipal staff
in North Bay
 How
to use the manual
 What are the E.12 Post Construction
requirements?
Project Status




November 2013 – Dan Cloak delivered 1st
Draft
March 2014 – Draft 2
July 2014 – Final Draft
October 2014 – three workshops scheduled
 Marin,

Sonoma, and Napa
Interspersed… many BASMAA Phase II
Committee Meetings
BASMAA in the title



Marin Napa Sonoma Solano Stormwater
Association (MNSSSA) is now the BASMAA
Phase II Committee
The BASMAA Phase II Committee wanted to
name the manual the ―BASMAA Post
Construction Manual‖
―Prepared for the Bay Area Stormwater Management
Agencies Association (BASMAA) Phase II Committee
with funding from the North Bay Watershed Association‖
E.12 in a nutshell




Site Design
Runoff Treatment
Peak Runoff Controls (Hydromodification
Management)
Facility Maintenance
Let’s Look Inside the Manual!
Types of Projects
Table 1-1. Requirements at a Glance
Type of Project
Single-Family Homes*
Create or replace 2,500
square feet or more of
impervious surface
Small Projects
All projects besides singlefamily homes* that create
or replace 2,500 – 4,999
square feet or more of
impervious surface
Requirements
Incorporate Site Design Measures
1. Limit clearing, grading, and soil compaction.
2. Minimize impervious surfaces.
3. Reduce runoff, for example by dispersing runoff to landscape
or using pervious pavements.
4. Conserve natural areas of the site as much as possible
consistent with local General Plan policies.
5. Comply with stream setback ordinances/requirements.
6. Protect slopes and channels against erosion.
Complete and submit a Stormwater Control Plan for Small
Projects/Single-Family Homes.
Types of Projects Continued
Regulated Projects
Same site design measures requirements as above, plus:
Projects, other than single- 1. Route runoff to bioretention or other facilities sized and designed
family homes,* that create
according to the criteria in Chapter 4.**
or replace 5,000 square
feet or more of impervious 2. Identify potential sources of pollutants and implement
corresponding source control measures in Appendix A.
surface
3. Provide for ongoing maintenance of bioretention facilities.
4. Follow instructions in the Manual to complete a Stormwater Control
Plan.
Advantages of LID

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Filtration and pollutant sequestration
Biological processing
Attractive landscape amenity
No mosquito problems
Mimic natural hydrology
Low maintenance
Easy to inspect
Slide provided by Dan Cloak Environmental
Consulting
Page
1-2
Bioretention
evapotranspiration
infiltration
Slide provided by Dan Cloak Environmental
Consulting
Page
1-2
Path to Compliance
1.
2.
3.
4.
5.
6.
7.
Pre-application meeting
Follow the Manual.
Stormwater Control Plan
Draft O&M Plan
Detailed project design
Construction
Transfer maintenance responsibility
Slide provided by Dan Cloak Environmental
Consulting
Page
2-1
Development Review Process
Pre-Application
Meeting
Completed
Application
―Deemed
Complete‖
Section
Review
Planning
Commission
Conditions of
Approval
CEQA
Review
Detailed
Design
Plan Set and
Permit
Application
Slide provided by Dan Cloak Environmental
Construction
Discuss
Development
Review
Process
design, O&M
responsibility
Pre-Application
Meeting
Lay out the site and
stormwater facilities
Planning
Commission
Incorporate facilities in
plans and
specifications
Detailed
Design
Completed
Application
―Deemed
Complete‖
Respond to
questions and
revise plan
Prepare and submit a
Stormwater Control Plan
Section
Review
Conditions of
Approval
CEQAfacilities. Submit
Construct
Stormwater
FinalReview
O&M Plan prior to end
requirements are
of construction
attached to COAs
Plan Set and
Permit
Application
Slide provided by Dan Cloak Environmental
Construction
Transfer Maintenance
Responsibility
Guidance
1. Step-by-step instructions in the Post
Construction Manual
2. Checklist (page 3-2)
3. Template
4. Example Stormwater Control Plan(s) (to
come)
Slide provided by Dan Cloak Environmental
Consulting
Page
3-1
Stormwater Control Plan
1.
2.
3.
4.
5.
6.
7.
8.
9.
Project Information
Opportunities and Constraints
Conceptual Site Design
Calculations and Documentation
Design Details
Source Controls
Maintenance
Construction Checklist
Certification
Slide provided by Dan Cloak Environmental
Consulting
Page
3-1
Analyze Your Project for LID Page
3-3
Optimize the Site Layout




Define the
development
envelope
Minimize grading
Set back from
creeks, wetlands,
and riparian areas
Preserve
significant trees
Slide provided by Dan Cloak Environmental
Page
3-3
Optimize the Site Layout

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Limit roofs and
paving
Preserve and use
permeable soils
Detain and retain
runoff throughout
the site
Use drainage as a
design element
Slide provided by Dan Cloak Environmental
Page
3-4
Use Pervious Surfaces
 Permeable
pavements

Green roofs
Design criteria
on page 4-6
Slide provided by Dan Cloak Environmental
Page
3-4
Disperse Runoff
Slide provided by Dan Cloak Environmental
Consulting
Page
3-4
Direct Runoff to Facilities
Slide provided by Dan Cloak Environmental
Page
3-4
7. Maintenance of Facilities



Operation and maintenance plan required
O&M Plan is referenced in an agreement that
―runs with the land‖
Stormwater Control Plan must:
Acknowledge and summarize maintenance
requirements
 Include a statement accepting maintenance
responsibility


Page
3-6
Most significant for subdivisions
Slide provided by Dan Cloak Environmental
Consulting
Drainage Management AreasPage
4-2


Follow roof ridges
and grade breaks
Different DMA for
each surface type
Slide provided by Dan Cloak Environmental
DMA Types

Pervious DMAs
Page
4-2
Use a curb to avoid run-on
from self-treating areas
 Self-treating
 Self-retaining

Impervious DMAs
 Drains
to
self-retaining
 Max
2:1 ratio
impervious:pervious
 Drains
to LID facility
Slide provided by Dan Cloak Environmental
Consulting
To storm drain
Grade self-retaining areas
to drain inward. Set any area
drains to pond 3"-4"
Example
DMA-1
DMA-2
DMA-3
DMA-4
DMA-5
DMA-6
DMA-7
Total
Slide provided by Dan Cloak Environmental Consulting
3200
3200
3700
12400
500
8500
4200
35700
Sizing
DMA
Name
DMA-1
PostDMA
project
Area
surface
(SF)
type
3200 Roof
DMA-2
3200 Roof
1.0
3200
DMA-4
12400 Paved
1.0
12400
Facility
Sizing
factor
18800
0.04
Total>
Slide provided by Dan Cloak
Environmental Consulting
DMA
Runoff
factor
1.0
DMA
Area
Facility Name
runoff
factor
3200
Minimum
Facility
Size
Proposed
Facility
Size
752
900
DMA-1
DMA-2
DMA-3
DMA-4
DMA-5
DMA-6
DMA-7
Total
3200
3200
3700
12400
500
8500
4200
35700
Make This Happen

Page
4-5
Bioretention facilities are level so they ―fill up
like a bathtub.‖
Slide provided by Dan Cloak
Environmental Consulting
Page
4-7
Slide provided by Dan Cloak
Environmental Consulting
Planting Soil
 60-70% Sand

ASTM C33 for fine aggregate
 30-40% Compost

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
Certified through US Composting Council
Seal of Testing Assurance Program
Install in 8"-12" lifts
Do not compact
Do not overfill
Leave room for mulch
Slide provided by Dan Cloak
Environmental Consulting
Page
4-7
Landscaping



Select plants for fast-draining soils
Select for facility location
Avoid problem conditions
 Overly
dense plantings
 Aggressive roots
 Invasive weeds
 Need for irrigation or fertilization
Slide provided by Dan Cloak
Environmental Consulting
Page
4-7
Landscaping—O&M issues
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No fertilizer
No pesticides
Clean up as needed and annually
Add mulch if needed annually
 Compost

Page
5-2
mulch (aged mulch) recommended
Avoid filling in or re-grading
Slide provided by Dan Cloak
Environmental Consulting
MCSTOPPP’s
Bioretention Facility Plant Matrix
BASMAA Post Construction Manual
Slide provided by WRA Environmental
Consultants (Megan Stromberg)
Role of Plants
• Drought Tolerant
• Native or adapted to
• Tolerate well-drained CA climate
soils AND flooding • No fertilizer
• Irrigation
Slide provided by WRA Environmental
Consultants (Megan Stromberg)
Biotreatment Soil is Not Soil!
•
•
•
•
Concrete Sand and Compost
Very fast draining
Low water holding capacity
Very different from native soil
Slide provided by WRA Environmental
Consultants (Megan Stromberg)
Matrix Headings & Definitions
•
•
•
•
•
Plant Categories
Light Preference (sun, part, shade)
Size (height and width, in feet)
Watering Preference
Tolerances: Heat, Coast, Wind
• Zone 1 Hydrology - wetter
• Zone 2 Hydrology - drier
• High Performers
• Origin (Ca. Native or not)
Slide provided by WRA Environmental
Consultants (Megan Stromberg)