PSA - On-Call Design - McCormick Engineering LLC

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Exhibit A- Engineer's Services Understanding of the Assignment It is the understanding of McCormick Engineering, LLC (MCCORMICK) that the City has observed chronic flooding conditions along the northwest corner of the intersection of Harrow Drive and Hampshire Drive. At a second site, the City requires on -call support services related to improvements to the existing Calvert Basin in response to potential redevelopment or expansion of areas including and adjacent to the local ethanol plant. At a third site, the vicinity of Pershing Street and Huey Street drains poorly to an existing separated sewer. The City desires to develop up to three Prime construction contracts to improve the drainage at these three locations. The first Prime contract (Harrow Drive Contract) is anticipated to improve the local drainage by extension of existing stormwater infrastructure to the site. The second Prime contract (Calvert Basin Contract) will provide as -needed services related to discharges and detention volumes in response development requests to the City to the existing basin. Improvements might include improvements to the outlet from the noted facility and by possibly dredging the noted facility; lowering the normal pool level in the facility to provide additional effective detention volume; excavation of adjacent areas within the basin footprint to provide additional detention volume. The third Prime contract (Pershing Street Contract) will study potential infrastructure improvements to improve drainage in the greater vicinity of Pershing Street and Huey Street with a potential combination of proposed infiltration features and tie ins to an existing storm sewer near Brookfield Street and Pershing Street. The general locations of the sites are shown in Figures 1-3. Scope of Services Study and Report Phase - (All Prime Construction Contracts) MCCORMICK will perform the following tasks in order to complete the noted work: • Perform drainage calculations related to the peak rates and volumes of runoff contributing to the chronic standing runoff that remains in the ditch site after storm events. Perform similar calculations at the second detention facility site to quantify the frequency and nature of overtopping. • Provide a topographic survey of the Harrow Drive site via subconsultant in anticipation of work outlined in design phases below • Prepare an exhibit that indicates the general locations of proposed improvements, based on topographic survey (Harrow Drive site) or GIS LiDAR (Calvert Basin and Pershing Street sites) to be performed as part of the work. • Notify the City if project elements appear to require Right -of -Entry to perform the Work. • Respond to comments or suggestions from the City on the extent of proposed Work. 2025 Storm water On -Call Services Project - Scope of Services Page 13 of 14 (Exhibit A- Engineer's Services)