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Hinkson Creek Watershed Restoration Project Phase II

Hinkson Creek Watershed Restoration Project Phase II. FEASIBILITY ANALYSIS FOR RETROFITTING STORMWATER BMPs.

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Hinkson Creek Watershed Restoration Project Phase II

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  1. Hinkson Creek Watershed Restoration Project Phase II FEASIBILITY ANALYSIS FOR RETROFITTING STORMWATER BMPs

  2. NOTES- The Hinkson is roughly 26 miles long, its watershed is 88.5 sq miles. It is wholly within Boone county. The stream is considered perennially flowing below Providence, it is class “C” from Providence to Mt Zion Church Rd. The impaired section begins at Walnut St, just downstream of I-70.

  3. NOTES- We have a situation in which we are looking to reduce the quantity of run-off, and increase the over-all quality of the run-off What is the contaminant of concern? The Hinkson is listed on the 303(d) list of impaired waters for “unspecified” pollutants, in a 14 mile segment downstream of I-70. A variety of urban-associated chemical constituents (polycyclic aromatic hydrocarbons, pesticides, petroleum compounds, and metals) in some stormwater discharges, and high levels of salts in snowmelt samples, have been found in the area. DNR has said they will not target a chemical pollutant in their TMDL document, but will instead target the urbanized flow regime.

  4. Why is this an area of interest/hotspot? Sampling has documented toxicity in approximately 20% of stormwater discharges in this area Impairment of Hinkson Creek begins adjacent to this area Impervious surface in this area is expansive, approximately 85 acres within the Megamarket complex alone

  5. NOTES-The area of interest is characterized by large areas of impervious surface, with significant contribution from parking areas, rooftops, and roads. This area is roughly drawn, and is meant to include the Home Depot parcel to the north and the property lines of the commercial areas to the west. The eastern border follows a watershed divide. 63 I-70 Hominy Branch Area of Interest Hinkson Cr

  6. I-70 63 NOTES-This area is characterized by coverage with conventional asphalt parking lots and stormdrains with some landscaped islands; there are several overgrown concrete drainage channels along roadsides; two small reservoirs are within this area, one is a several decades old claypit; and there is a large disturbed area that is being cleared for the installation of detention basins behind WalMart and Hy Vee.

  7. What we are looking for in the scope of services: Ideas for retrofitting stormwater treatment structures or implementing practices that will give us the most “bang for our buck” A ranked list of locations within the area of interest, including 5 pre-selected spots, that would be optimal for retrofitting, and the BMPs that would be most suitable in those locations. Details on the proposed BMPs, including possible load reduction, detention provided, costs, and maintenance A methodology/rationale for selecting these locations and BMPs

  8. What we are looking for in the proposals: A general methodology/rationale for selecting retrofit locations and BMPs Recent references for work planning/designing stormwater BMPs List of personnel working on the proposal, and their relevant experience Cost of services and timeline for completion

  9. How we will use this information: We will be implementing a cost-share program for retrofitting BMPs in the area of interest. The feasibility analysis will direct our efforts in approaching landowners. The methodology for ranking the BMP locations may be used in other areas within the City, County, or University.

  10. www.helpthehinkson.org ?

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