Stormwater Management 101: Implementation Options through Partnerships CWEA Stormwater 2015 Spring Seminar: LID Design Workshop- Lesson Learned Stormwater Management 101: Implementation Options through Partnerships

Design Prospective: Getting Your Plans Approved Rosanna La Plante, P.E. Office of Compliance and Laboratories Department of Public Works City of Baltimore April 2015

Department of Public Works Who we are. Unlike other counties, we have authority for both SWM AND ESC.

Plans Review and Inspection Section Stormwater Management (Article 7, Div. II) Erosion &Sediment Control (Article 7, Div. III) Wet Utilities (Article 25 and Standard Details) Inspections Pre-construction notification Bi-weekly Inspections Milestone SWM inspections Final Inspection/ Removal of ESC Post-construction Inspection SWM: Every 3 years or by complaint ESC: By complaint Plans Review by DPW Building Permit DHCD ROW Permit DGS What we do

SWM /ESC Review Process Concept Submittal Concept Approval SDP Submittal SDP Approval Final Submittal Review Comments Waiver Public Notice Review Comments NPDES General Construction Permit Review Comments Process: noting three review stages City Permits MDE Permits Final Approval Construction

Stormwater Management Options 1. ESD Practices (Ch. 5) By CLA, RLS, or PE Small footprint Drainage area constraints Simple calculations Most require infiltration Demonstrate ESD to MEP Quality Control 2. Traditional Practices (Ch 3) Most require P.E. Large footprint & d.a. Long complicated calculations Quantity/Quality Control 3. Alternative Practices Limited Guidance Quality Control Demonstrate that stormwater management has been considered in this order. Emphasize ESD to MEP. Innovative technology is part of alternative practices. Other alt include affforestation, stream restoration, and mechanical sweeping. Off-site treatment usually constrained to same watershed. Fee in lieu is a last resort. On-site Treat Off-Site Treat SWM Bank Fee-in-lieu

Site Constraints of an Urban Area This helps ESD to MEP argument. Easy to argue that ESD can’t be done… but High density/small sites l Established utilities l Dispersed open space Polluted soils l Buried streams l Compacted soils l Neighborhood identity

Treatment Train Waverly School #51 9 Micro-bioretention areas and a green roof Example of treatment train and ESD practices in an urban area. It can be done.

Available Guidance Expectation of Content Documents the conversation Checklists Expectation of Content Documents the conversation Basis of QA/QC Decreased design & review effort Std Details Tech Specs Notes The state guidance manual is a good starting point but there are supplemental guidance docs for ESD Note that anything in italics is a requirement. Most jurisdictions have their own checklist to reflect their unique issues – find them early or expect delays. Although we have over 17 checklists, they have helped a lot in decreasing review times. Updated Standard details for ESC has also improved the review time and the City is working on std SWM details and technical specifications to decrease both design and review times. This also allows for quality control of materials. For our City projects, we have modified our checklists to include a review by the project manager– a pre-screening before it gets to our office. This allows the PM to understand the quality of the submittal. Do not assume that the standard notes are skipped over– we read them carefully.

Get the Right People Involved Early Regulatory Agency Each jurisdiction is a little different Pre-submission meetings are encouraged Design Team Resist the “silo” treatment of SWM/ESC Owner’s Maintenance Staff Just because it can be built, does not mean the owner can maintain it. Community Franklin Square Elementary /Middle School (Photos provided by Parks and People Foundation) This should be step #1. Stormwater used to be considered an afterthought resulting in it being the bottle neck for permitting. Silo treatment– swm/esc part of civil team and usually produce separate drawings, which don’t match the full package. This is very important for green roofs and rainwater harvesting. Maintenance – cite school example and permeable pavement. Community – SWM is visible. If accessible to the public, then get their buy-in early or they will use the SWM/ESC review to stop the project.

Schedule and Cost Considerations Review time and the queue Response to comments  There are always comments! Public Notice – NPDES General Permit Costs Borings and infiltration tests Underground utility location Permitting fees SWM surety bond requirements As-built and survey requirements = $ Time is money. This goes back to the getting right

Rain Gardens and Micro-Bioretention Insufficient ponding area Drainage delineation Getting flow to facility Underdrain positive drainage Fabric layer Location – think about salt and snow Utility location Standard details – not typical

Exercise 1 Practice Area (sf) D.A. (ac) I.A. (ac) Vol. (cf) ESDv (cf) Pe 1 5,320 0.45 0.17 7,441 1,681 2.0 3a 4,585 0.25 0.00 5,961 120 2.6 3b 2,232 0.29 2,902 135 3c 3,498 0.42 0.01 4,547 280

Exercise 2

Micro-Bioretention – Design Blue Alleys Project (Photos provided by Blue Water Baltimore and Biohabitats)

Micro-Bioretention –Install

Permeable Pavement DA=surface of pervious (no run on) No water ponding in the pervious pavers Soil types Be aware of surroundings Detailed sequence of construction Maintenance requirements Blue Alleys Project (Photos provided by Blue Water Baltimore and Biohabitats)

Green Roof DA = Surface of roof (run on ok) Access to site for maintenance Continuous coordination with Architect

Summary Follow local regulations and use guidance documents. Keep open communication early and often… but don’t pester. Consider schedule and costs in project planning. Identify site constraints early to support ESD to MEP. Provide clean and clear plans and supporting docs.

Office of Compliance and Laboratories Department of Public Works Thank you for your time. Ms. Rosanna La Plante, P.E. Office of Compliance and Laboratories Department of Public Works Rosanna.LaPlante@baltimorecity.gov 410-396-0732