Stewarts Creek Water Quality Improvement - Implementation

Transcription

1 tewarts Creek Water Quality Improvement - Implementation City of Monroe, North Carolina Chris Costner, PE City of Monroe eungho ong, PE, CFM CDM mith eptember 18, 2017

2 Introduction to Monroe s tormwater Utility and tormwater Master Plan Program Phase I (2015 ~ 2016) tewarts Creek Watershed ampling / Monitoring Phase II (2016 ~ ) Water Quality Improvements and Implementation Phase III (2017) Future City Plans Key Words: mall Budget Multi-Year Works! Presentation Outline

3 County seat of Union County outheast of Charlotte, NC Population: 34,000 ± ize sq. miles Watersheds tewarts Creek Bearskin Creek Richardson Creek tewarts Creek Located in the northwestern part of Monroe Approximately 13.8 square miles of contributing drainage area 1/3 of the watershed is outside the City limits Flow into Lake Twitty (water supply lake) before discharging into Richardson Creek General Information

4 City of Monroe trmwater Prgram Purpose: Meet EPA s NPDE, Phase II requirements To enhance existing stormwater system To protect water resources Reservoir drinking supply Protect our streams/creeks Recreation use Future generation Key Components: Program Administration NPDE, Phase II Compliance tormwater Operation / Maintenance tormwater Capital Improvement Projects tormwater Inventory tormwater Master Planning / Water Quality

5 trmwater Utility Fee chedule Budget: FY16: $2,100,900 FY17: $2,261,600 FY18: $2,219,400 Fund Balance: $1,487,000 (reserve) Residential Rate ingle Family Detached/ Mobile Homes Tier Impervious Area (square feet) 0 to 2,010 - $3.15/month 2,011 to 3,289 - $4.50/month 3,288 and beyond - $6.30/month Other Residential Units Town Homes - $2.25 /month Multifamily - $2.70/month Condominiums - $2.25/month Non-Residential Rate 1 Equivalent Residential Unit (ERU) per Impervious Area - $4.50/ERU/month 1 ERU equal to 2,618 square feet of impervious surface Began collecting stormwater fees in January 2009 July 2014 first utility rate increase

6 trmwater Master Planning Prgram

7 trmwater Master Planning Prgram Budget $100,000 per year for planning $20,000 per year for sampling Multi-Year tormwater Master Planning Process Phase I tarted March years to complete Water quantity during the first four years City-Wide water quality in the final year Water Quantity Analysis Used Unsteady tate modeling concept Model cenarios: Existing Land Use Conditions Future Land Use Conditions

8 trmwater Master Planning Prgram (cont.) Recommendation tructural Recommendations Non-tructural Recommendations Water Quality Analysis tarted November 2012 Evaluation of historical water quality data from NC DEQ Verify the determination of impairment from NC DEQ Potential ources Land Development Nonpoint source runoff (i.e. urban, agriculture and land development)

9 trmwater Master Planning Prgram tewarts Creek Water Quality Improvement Further Define Impairments Impaired Waters 303 (d) Category 5 Impaired Waters tewarts Creek (including Lake Twitty) Richardson Creek (Including Lake Lee) tewarts Creek Watershed Improvement Program 3 Phases FY15: Data Collection FY16: CM Evaluations, Concept Plans and Public Outreach FY17: tormwater Master Plan Update for tewarts Creek basin

10 tewarts Creek Watershed Water Quality Monitoring (Phase I) Ambient ampling Activities 4 Ambient amplings at 4 locations Lab Analysis Water Quality Evaluation tormwater ampling Activities 10 tormwater amplings at 1 location Lab Analysis Water Quality Evaluation

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13 ummary of Ambient ampling Data Constituent WMM Value Laboratory Reporting Limit Median Measured Value Average Measured Value TKN (mg/l) Nitrite+Nitrate N (mg/l) Total N (mg/l) Ortho P (mg/l) Total P (mg/l) TD (mg/l) NA T (mg/l) NA Turbidity (NTU) NA Copper (mg/l) Zinc (mg/l) NA BOD 5 (mg/l) NA ph NA NA Water Temp ( C) NA NA DO (mg/l) NA NA DO aturation (%) NA NA 71% 66%

14 ummary of tormwater ampling Data Constituent WMM Value Laboratory Reporting Limit Median Measured Value Average Measured Value TKN (mg/l) Nitrite+Nitrate N (mg/l) Total N (mg/l) Ortho P (mg/l) Total P (mg/l) TD (mg/l) NA T (mg/l) NA Turbidity (NTU) NA Copper (mg/l) Zinc (mg/l) NA BOD 5 (mg/l) NA ph NA NA Water Temp ( C) NA NA DO (mg/l) NA NA DO aturation (%) NA NA 73% 67%

15 tewarts Creek Watershed Water Quality Improvement BMP Evaluation, Concept Plans and Public Outreach (Phase 2) tormwater BMP Evaluation Review of City s Ordinance (non-structural stormwater BMP) Potential candidate sites for structural stormwater control measures (CM) Criteria ite Investigation (13 sites) CM identification for potential candidate sites Concept Plans Primary candidate CM 5 sites CM Opinions of Probable Construction Cost ($2,500,000) Public Outreach Public input on conceptual improvement plans Questionnaires and public meeting Property Owner Coordination

16 Potential CM ites Investigations

17 CM ites Evaluation coring heet

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23 tewarts Creek Watershed Water Quality Monitoring tormwater Master Plan Update (Phase 3) Update the City s Current tormwater Master Plan Incorporate tewarts Creek monitoring and BMP evaluation Add content to meet the EPA s 9 criteria for a watershed restoration plan: 1) Cause and ources 2) Load reduction expected 3) NP Management Measures 4) Technical and Finance Assistance 5) Information / Education 6) chedule 7) Measurable 8) Criteria used to determine load reduction 9) Monitoring Compilation of the tormwater (Quality + Quantity) Master Plan Report

24 What Next? ubmit updated tormwater Master Plan to NC DENR Water Planning ection Division of Water Resources Find funding source for proposed recommended CMs Design / Construct tructural CM

25 THANK YOU! QUETION? Contact: Chris Costner, P.E eungho ong, P.E., CFM