Boyer Final slides print version - Kieser & · PDF file3/7/2013 Kieser & Associates, LLC 1 WMU‐Arcadia Creek Stormwater Treatment and Floodplain Enhancement Project DEQ #2008‐0018

3/7/2013

Kieser & Associates, LLC 1

WMU‐ArcadiaCreekStormwaterTreatmentandFloodplainEnhancementProjectDEQ #2008‐0018

Celebrating 20 Years of Excellence in Environmental Science & Engineering www.kieser‐associates.com

K. Brian Boyer, P.E.Environmental Engineering Manager

Kieser & Associates, LLCbboyer@kieser‐associates.com

March 7, 2013

OverviewOverview• Location and Regulatory Setting• Stormwater Goals and Funding• Project Challenges• Creative Solutions• Successful Outcomes

Kalamazoo River Watershed

2,020 sq. milesLake Allegan

MICHIGANPortage & Arcadia Creek Subwatershed

SCALE (MILES)

0 10 155WMU

WMU Main

City of Kalamazoo

Project Site

Campus

Arcadia Creek APPROX. SCALE (MILES)

0 0.25

Direction of Flow to the Kalamazoo River

PROJECT AREA

PROJECT AREA

Project LocationProject Location Regulatory SettingRegulatory Setting

Total Maximum Daily Load (TMDL) CWA Section 303d – requirement to list impaired waters

Maximum amount of a pollutant that a water body can receive and still safely meet water quality standards

Kzoo River/Lake Allegan TMDL (2001) for phosphorus (TP)

TMDL Goal: 50% reduction of 1998 (baseline) TP load

Municipal Separate Storm Sewer System (MS4) WMU voluntary stormwater permit 2000

WMU MS4 Watershed General Permit, issued December 23, 2003

Compliance & Sustainability

3/7/2013


Project GoalsProject Goals

1. Reduce nonpoint source pollutant loads TMDL Compliance (50% reduction goal)

2010‐2011 TMDL Compliance Plan for campus footprint

2. Reduce peak flows, increase floodplain access

3. Restoration of eroding streambanks 3. Restoration of eroding streambanks

4. Bioretention within restored floodplains

5. Increase groundwater recharge

6. Enhance habitat using native vegetation

7. Stormwater NeutralTM (net‐zero TP discharge) Campus‐wide sustainability Off‐campus Offsets

Flooding around Steam Pipes

Flooding (2008)Flooding (2008)

Waldo Stadium Flooding

Stadium Steps Flooding

CMI Grant FundingCMI Grant Funding

Grant Amount: $ 379,252

Match Funds: $ 168,937

Total Amount: $ 548,189

1 Fixed budget 2 Pre‐approved work scope1. Fixed budget 2. Pre approved work scope

STREAMBANK RESTORATION

NATIVE VEGETATION


STORMWATER DIVERSION

STORMWATER OVERFLOW BYPASS

ARCADIA CREEK

STORMWATER TREATMENT & INFILTRATION


STREAMBANK RESTORATION

ARCADIA CREEK

NATIVE VEGETATION

OFF‐LINE FLOODPLAIN BIORETENTION

Project ChallengesProject Challenges

1. Endangered species evaluation/assessment MDEQ

MDOT

2. MDOT right‐of‐way requirements Side slopes

‐ (extra review/approval process was not anticipated)

‐ (at most 4:1 side slope adjacent to road)

Water depth

Set‐back distance

Road sub‐grade

Fencing/guardrail

‐ (at most 4‐ft maximum water depth)

‐ (min. 28‐ft roadway clear zone)

‐ (min. 32‐in dry sub‐grade depth)

‐ (perimeter fencing, roadside guardrail, 840 ft)

DESIGN REVISIONS $$$

~$25K to $30K

3/7/2013



3. MDEQ Floodplain Permit APPLICATION CORRECTION REQUEST

‐ HEC‐RAS modeling, plan, profiles, cross‐sections

‐ Topo contours no greater than 1‐ft intervals

‐ River/overbank cross‐sections (existing/proposed w/ photos)

‐ List of all assumptions and variables used in model

~$15K to $20K

f p

‐ Discussion of how starting conditions were assumed

‐ Discussion of how “n” values were estimated

‐ Discussion of how other variables were estimated

‐ Calibration to existing Flood Insurance Study

‐ Depict proposed floodway, discuss determination methods

‐ Obtain a Letter of Map Revision (LOMR) from FEMA

Add’l File Fee $450 Review Fee $1,500 30 –Days!


4. Inaccurate historic floodplain elevation data 1970s data

2010 survey data (1‐ft contours)

City of Kalamazoo to submit flood insurance map revisions

5. Revisions to maintain project objectives5. Revisions to maintain project objectives Layout and grading plan revisions (MDOT/ MDEQ concerns)

6. Cost concerns and project viability Do we still have a project?

ADDITIONAL COSTS $42K to $52K

Creative SolutionsCreative Solutions

1. Endangered species evaluation/assessment Additional MDOT Review

‐ Resubmit MDEQ documentation, no additional information

2. MDOT right‐of‐way requirements‐ Eliminate fencing install used guardrail‐ Eliminate fencing, install used guardrail

3. MDEQ Floodplain Permit Application Correction Request

‐Modeling alterna ve → cross‐sectional increase demo

‐ Cross‐section all fill areas

‐ No decrease of floodplain cross‐sectional areas


‐ Provided 15 critical cross‐sections, with grading modifications


FILL Net Increase = 8.18%

Avg. Increase = 9.5%

Additional 3.8 Acre‐ft

CUT


4. Inaccurate historic floodplain elevation data Historic fill concerns

‐ Provide historic aerial photos (spanning 1960 – 2010)

‐ Demonstrate no land/veg disturbance, age of existing trees

‐ Can rely on 2010 survey data (1‐ft contours)

5. Revisions to maintain project objectives‐ Substitute guardrail for plants/trees/plugs (seed only)

‐ On‐site, upland spoils placement (in lieu of hauling)

USED GUARDRAIL $10,360 SavingsON‐SITE SPOILS $85,770 Savings

3/7/2013


(After)

Successful Project OutcomesSuccessful Project Outcomes

• Stormwater Diversion Swale

Location

(Before)

(After)


• Stormwater Diversion Swale• Expanded Floodplain• Native Vegetation

Location

(Before)

(After)


• Stormwater Treatment• Infiltration• Expanded Floodplain• Native Vegetation

Location

(Before)

(After)


• Stormwater Treatment• Infiltration• Expanded Floodplain• Native Vegetation

Location

(Before)

(After)


• Increase Floodplain Connectivity and Capacity

Location

(Before)

(After)


• Streambank Restoration• Native Vegetation

Location

(Before)

3/7/2013


• Increase Floodplain Connectivity and Capacity

• Bioretention & Infiltration


(After)

Location

(Before)

(After)


• Removal of In‐stream Obstruction

Location

(Before)

ImprovementImprovement QuantificationQuantification

Redirect urban stormwater runoff 102 acres

Provide treatment for first-flush stormwater runoff 120 ac-ft/yr

Streambank restoration of eroding streambanks 268 ft

Restoration of disconnected floodplains used for 1 6


pbioretention

1.6 acres

Increased floodplain capacity 6,130 cyd

Increased groundwater recharge 60 ac-ft/yr

Enhanced habitat through use of native Michigan vegetation/seed mixes

3.5 acres

Reduction of total phosphorus load to Arcadia Creek 85 lbs/yr

Reduction of sediment loading to Arcadia Creek 27 tons/yr

• 15 BMPs since 1998• 468.8 acres treated including BTR (blue areas)

• 59.8% of campus


Off‐Campus Contributing Areas


TMDL Compliance

StormwaterNeutralTM

Runoff Volume(Net zero TP

discharge)

Off‐Campus Offsets

Description Metric

Construction ($) $235,000

Total Phosphorus (TP) Removal ($/lb) $5,460

Total Suspended Solids (TSS) Removal ($/ton) $19,580

Stormwater Volume Treated ($/gal) $0 34


Stormwater Volume Treated ($/gal) $0.34

Drainage Area Served ($/acre) $2,300

ENVIRONMENTAL METRICS

= $$$ PRIORITIES

FUTURE DECISION‐MAKING!

3/7/2013


Concluding RemarksConcluding Remarks

• Floodplain enhancement / functionality

• Collaboration / negotiation

• Shared vision for improvement / outcomes

• Water quality goals / objectives

• Priorities (environmental benefits/metrics)

PROJECT PARTNERSThe FORUM of Greater Kalamazoo

Western Michigan UniversityCity of Kalamazoo

MDOTDriesenga & AssociatesHoffman Brothers, Inc.

Kieser & Associates, LLCMDEQ

Questions?Questions?

Brian Boyer, P.E.Environmental Engineering Manager

Kieser & Associates, LLCbboyer@kieser‐associates.com

Celebrating 20 Years of Excellence in Environmental Science & Engineering www.kieser‐associates.com

(Copies of presentation are available)

Documents

Boyer Final slides print version - Kieser & · PDF file3/7/2013 Kieser & Associates, LLC 1 WMU‐Arcadia Creek Stormwater Treatment and Floodplain Enhancement Project DEQ #2008‐0018