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BOLTON <br /> SOiCL 206, <br /> & MENK <br /> R3 s", MR-553 -5119 <br /> BOW-`•.7,,,•:k cord <br /> MEMORANDUM <br /> Date: February 19, 2018 <br /> To: Mr. Patrick Brama, Economic Development Manager <br /> Mr. Time Gladhill, Community Development Director <br /> Mr. Bruce Wetsby, City Engineer <br /> From: Kevin P. Kielb, P.E. <br /> Subject: Ramsey Parkway Center Median Analysis <br /> City of Ramsey <br /> Introduction <br /> The City of Ramsey is reviewing the potential for revising the proposed design of the Ramsey Parkway <br /> center median between Center Street and Zeolite Street. The median is currently proposed as a raised, <br /> vegetated median with trees, shrubs and grasses. The total length of median area, not including the paved <br /> intersections,is approximately 1,565 feet. The area analyzed is depicted on Figure 1. <br /> The City is exploring the potential of creating a depressed median design, with stormwater directed to the <br /> median from the travel lanes of Ramsey Parkway. <br /> Based on recent conversations with City staff,infiltration is not allowed within The COR area. Depressed <br /> medians will need to be designed as filtration systems,rather than infiltration systems. This adds <br /> significantly to project costs when compared to a typical depressed, vegetated median. <br /> Recommendations <br /> The median areas through the COR are located in the moderate vulnerability Drinking Water Supply <br /> Management Area. Groundwater protection will be required if the medians are depressed. <br /> A table was prepared depicting estimated project costs associated with the various alternatives reviewed. <br /> Either woven geotextile liner, clay liner, or EPDM rubber liner could be used for lining the median area. <br /> The City should consider the benefits and costs for the various options when deciding which option to <br /> select. <br /> Design Considerations <br /> Construction stormwater best management practices (BMPs)in the median areas include directing <br /> stormwater runoff volume from the street into the median through curb cuts or pipe and depressing the <br /> median area to create stormwater capture volume. Additional infrastructure is necessary to keep soils dry <br /> (i.e.perforated tile) and/or overflow structures to capture and discharge flood level flows. <br /> The majority of the COR is in the Moderate Vulnerability drinking water supply management area, with <br /> certain sections within the Emergency Response Area. Based on conversations with the City,these areas <br /> C:\Users\kevinki\Desktop\Ramsey Median\The COR-Center Median Memo 02162018.docx <br />