PSA - Erskine Drainage Improvements Study - McCormick Engineering, LLC.

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Exhibit A- Engineer's Services McCormick Engineering, LLC (MCCORMICK) recently performed design Plans and analyses of improvements to improve the performance of the Miami Road Detention Basin (Miami Basin), which is in the southwest quadrant of the intersection of Miami Road and Ireland Road. Water levels in the Miami Basin are currently controlled by infiltration and a controlled release valve to a combined sewer. The City desires to develop a comprehensive solution that would provide a more adequate outfall at the Miami Basin, while providing compensatory storage to offset release of additional discharge from the Miami Basin, and improving drainage conveyance at the Erskine Municipal Golf Course. The general location of the watershed and sites are shown in Figure 1. Study and Report Phase MCCORMICK will perform the following tasks in order to complete the noted work: Task SR1— Review of Previous Studies This task will include collection of available data and documents from EmNet related to the performance of the Miami Basin during the August 2016 storm event in order to perform a check on the results of the hydrologic modeling characteristics developed in task listed below. McCormick Engineering will also review other currently available data prepared by others such as drainage study reports by others, information from historical records, topographic mapping. Task SR2 — Field Reconnaissance MCCORMICK staff will conduct a field reconnaissance of the targeted portion of the watershed. This will include site visits to confirm and enhance hydrologic analysis performed in the 2016 engineering study. Task SR3 — Hydrologic Modeling In order to analyze potential drainage improvements at the Erskine Municipal Golf Course, it is anticipated that three general sources of potential stormwater inflow would need to be assessed: Flow from the Miami Basin, currently directed to CSO 22 via a combined sewer • Flow from the High Street Sewer at Ireland Road • Flow from Chippewa Basin watershed sources downstream of Ireland Road McCormick Engineering will develop a base condition HEC-HMS model to represent the watershed response of these three stormwater contributions to the Chippewa Basin at the downstream side if the Erskine Drainage Improvement Study - Scope of Services Page 1 of 3 (Exhibit A- Engineer's Services)