northeastern illinois development and kane county needs...(article vi.c.13.4) 1:1 ratio (55.021.f)...

KANE COUNTY Brolley, Berman, Burns, Kaptain, Pickett, Michels

Hernandez, Silva, Martin, Allan, Kojzarek, Lenert

Ex-Officio: Frasz, Lauzen & O’Connor

STORMWATER MANAGEMENT PLANNING COMMITTEE

TUESDAY, MARCH 13, 2018

County Board Room Agenda 4:00 PM

Kane County Government Center, 719 S. Batavia Ave., Bldg. A, Geneva, IL 60134

Kane County Page 1

1. Call to Order

2. Approval of Minutes: April 11, 2017

3. Public Comments

4. Approval: Stormwater Management Planning Committee Ex-Officio Replacement

5. Approval: Technical Advisory Committee Replacement

6. Presentation: Engineering Resources Associates (ERA) Power Point

A. Project Back Ground

B. Project Goals

C. What’s Been Done So Far

D. TAC Recommendations

E. What’s Next

F. Project Schedule

7. New Business

8. Next Meeting: June 12, 2018 @ 4:00 pm

8. Adjournment

COUNTY OF KANE

KANE COUNTY DIVISION OF ENVIRONMENTAL & WATER RESOURCES Kenneth N. Anderson, Jr Director Jodie L. Wollnik, P.E., CFM Assistant Director

County Government Center 719 Batavia Avenue Geneva, IL 60134 Phone: (630) 232-3497 Fax: (630) 208-3837 e-mail: WollnikJodie@co.kane.il.us website: http://www.co.kane.il.us

TO: Stormwater Management Planning Committee FROM: Kenneth N. Anderson, Jr – Director DATE: March 6, 2018 RE: Appointment of Ex-Officio Municipal Member of Stormwater Management Planning Committee Mayor Irvin of Aurora has recommended Deputy Mayor Chuck Nelson for appointment as Ex-Officio Member replacing Robert J O’Connor who did not run for reelection in 2017. We recommend approval of the appointment of Deputy Mayor Chuck Nelson as Ex-Officio Member of the Stormwater Management Planning Committee.

COUNTY OF KANE

KANE COUNTY DIVISION OF ENVIRONMENTAL & WATER RESOURCES Kenneth N. Anderson, Jr Director Jodie L. Wollnik, P.E., CFM Assistant Director

County Government Center 719 Batavia Avenue Geneva, IL 60134 Phone: (630) 232-3497 Fax: (630) 208-3837 e-mail: WollnikJodie@co.kane.il.us website: http://www.co.kane.il.us

TO: Stormwater Management Planning Committee FROM: Kenneth N. Anderson, Jr – Director DATE: March 6, 2018 RE: Appointment of Technical Advisory Committee Voting Alternates The City of Batavia has requested the replacement of Scott Haines as their voting alternate with Rahat Bari. The City of St. Charles has requested the replacement of Chris Bong as their voting alternate with Monica Hawk. We recommend approval of the appointment of Rahat Bari and Monica Hawk as voting alternates on the Kane County Stormwater Technical Advisory Committee.

Kane County Stormwater

Ordinance Revisions

John Mayer & Erin Pande

Engineering Resource Associates, Inc. March 13, 2018

Where We Have Been and

Where We are Going

Presented to the Kane County Stormwater Management

Planning Committee

Stormwater Management

Ordinance Background➢ SMO adopted in 2001

Effective 2002

Minor revisions in 2009

➢ Countywide Enforcement

Certified Communities

Non-Certified Communities

Unincorporated Kane County

Project Goals

➢ Update existing SMO to provide:

Consistency with Statewide & Federal Regulations

Streamlined permitting

NPDES & BMP requirements

Consistency with County 2040 Plan & Green Infrastructure Plan

➢ Engage Certified Communities & Stakeholders

➢ Update Technical Reference Manual (TRM)

What’s Been Done So Far?

➢ Website

www.kanecountystormwaterupdate.org

➢ Identify Known Issues

Certified Community Input

➢ Review Historic Documents

What’s Been Done So Far?

➢ Agricultural Subcommittee Meetings

➢ Technical Advisory Committee (TAC)

Meetings

Stormwater Management

Floodplain/Floodway

Wetlands/Buffers

What’s Been Done So Far?

➢ Comparison to neighboring counties

StandardKane County

(2001)

DuPage County

(2013)

Cook County

WMO (2014)

Lake County

(2015)

McHenry County

(2016)

Will County

(2004)

Compensatory

Storage In

Depressional

Storage Areas

1:1 Ratio

(9-27.G)

1:1 Ratio

(15-81.D.1)

Exemptions:

<640 acres & total

fill <200 CY

(15-81.D.1 to D.2)

Do not exceed

existing release

rates

Non-Riverine

Regulatory

Floodplain:

1:1 Ratio

(704.02)

1:1 Ratio &

based on critical

duration storm

(Article VI.C.13.4)

1:1 Ratio

(55.021.F)

Compensatory

Storage in

Floodplain &

Flood Prone

Areas

Riverine:

1.5:1

Non-Riverine adj

to lake: 1:1 Ratio

1.5:1 Ratio

Exemptions:

flood protection of

ex. building for

volume displaced

by building &

within 10’ of

building; <640

acres & floodplain

reduced by <0.5%

at all cross

sections; <640

acres & total fill

<200 CY

(15-81.D.1 to D.2)

1.1:1 Ratio

(602.9)

Exemptions:

Flood proofing of

ex. Building

(602.11)

1.2:1 Ratio

(704.01)

1.2:1 Ratio for

development

partially on-site

with more than

10% of the BFE

surface area on-

site

(704.03)

1.5:1 ratio w/o as-

built;

1.2:1 ratio w/ as-

built;

1:1 ratio for

roadway

development

Exemptions:

<=5CY of fill,

replacement of

onsite waste

disposal systems

& flood proofing

w/i 10’ of ex.

Buildings;

artificially created

storage

(Article VI.C.13.a

Table 7)

Riverine:

1:1 Ratio

Non Riverine:

1:1 Ratio

(55.063)

TAC Recommendations

Detention Triggers

➢ Existing: Zoning Based ➢ Proposed: Impervious Based

TAC Recommendations

Watershed Benefit Measures

➢ Existing: N/A

➢ Proposed: New Standard for

large, open space parcels &

agricultural properties

TAC Recommendations

Credit for Impervious Area

Removal

➢ Existing: N/A

➢ Proposed: New Standard

TAC Recommendations

Downstream Discharges

➢ Existing:

Ordinance is not clear how far downstream

should be analyzed for impacts from offsite

outfalls

➢ Proposed:

Consistent with Illinois Drainage Law

“Reasonable Use”

TAC Recommendations

Upstream Conveyance

➢ Existing:

Allows offsite tributary surface water to flow

through side yards into detention basins

➢ Proposed:

Require preventative design measures

and/or maintenance responsibilities to

address surface water from agricultural

areas into development

TAC RecommendationsFee-In-Lieu of Detention

➢ Existing:

Redevelopment

Mass Grading

➢ Proposed:

Redevelopment

Mass Grading

New Development

TAC RecommendationsSubstantial Damages in Floodway

➢ Existing:

Not allowed to replace,

reconstruct, repair or modify

➢ Proposed:

Allowed to replace, reconstruct,

repair or modify with same

outside building dimensions

Consistent with IDNR standards

TAC RecommendationsSubstantial Improvements in Floodway

➢ Existing:

Improvements and maintenance

cumulative since 2010

➢ Proposed:

Improvements remain cumulative

since 2010

• Examples: Kitchen & Bathroom

remodel

Maintenance items over previous

10-years

• Examples: Roofing, windows

replacement, painting, etc.

TAC Recommendations

1.5:1 Ratio

w/o modeling

• Keep current standard for projects not requiring detailed engineering studies

1.2:1 Ratio

w/ modeling

• Revise standard for projects providing updated engineering studies

1:1 Ratio

Restoration

• Revise standard for projects providing a watershed benefit measure

1:1 Ratio

Depressional Storage

• Same as current standard

1.5:1 Ratio

• Riverine Floodplain

1:1 Ratio

• Non-Riverine Floodplain

1:1 Ratio

• Depressional Storage Areas

Compensatory Storage

Existing Proposed

Compensatory Storage

Exemptions➢ Replacement of septic systems in

floodplain or floodway

➢ Agricultural dredged spoils in

floodplain

➢ Small amounts of fill to restore

subsided areas in floodplain

➢ Building structural members and

building materials for accessory

structures in floodplain

What’s Next?

➢ Reorganize ordinance sections

➢ Upcoming TAC Meetings Wetlands/Buffers (April 2018)

Best Management Practices (April 2018)

Sediment and Erosion Control (April 2018)

Administration, Enforcement, General Provisions (May 2018)

What’s Next?

➢ Stakeholder

Outreach

➢ Draft Ordinance

Language

➢ Reconvene TAC

Stakeholders

Municipalities & Certified

Communities

Watershed Groups

Environmental Groups

Local Developers

Roadway Agencies

Forest Preserve Districts

Park Districts

Schedule

2018 2019

Apr May Jun Jul Aug Sep Oct Nov Dec Jan Feb

TAC Meetings

Stormwater Management Committee Meeting

Draft Ordinance Language

County Board Meeting

Public Comments

Ordinance Adoption

Comments or Questions?