PSA - Arcadis - North Station Well #1 Replacement Design

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This is EXHIBIT A, consisting of 6 pages, referred to in and part of the Agreement between Owner and Engineer for Professional Services dated 2016. Engineer's Services Article 1 of the Agreement is supplemented to include the following agreement of the parties. Engineer shall provide Basic and Additional Services as set forth below. PART 1— BASIC SERVICES The City of South Bend (City) owns and operates nine groundwater treatment facilities with combined theoretical total and firm production capacities of 77.2 million gallons per day (MGD) and 53.7 MGD, respectively. However, the City believes the actual combined fine production capacity of the system based on its current condition is closer to 40-45 MGD. Reduced revenue has limited the City's ability to implement needed improvements to the treatment facilities. Today, the average day demand is about 15 MGD, with peaks reaching about 30 MGD. Thus, the City is able to handle the current demand although any further deterioration will be detrimental, especially as the reliability continues to decrease for the aged equipment. The North Station, a critical treatment facility in the system, includes four wells and has a theoretical total and firm capacity of 11.2 MGD and 7.8 MGD, respectively. The total capacity based on current. conditions is 8.6 MGD. Well No. 1 has been downsized over the years and was found recently to be pumping significant amounts of sand. Because of the criticality of this station, the City desires to replace Well No. 1 to its original capacity in proximity to the existing well, which is the focus of this scope of work. Rehabilitation of the Well No. 1 would involve the installation of an internal liner (smaller diameter screen and filter pack placed within the existing screen) and would substantially reduce the production capacity of the well and the effectiveness of routine cleanings, thereby decreasing the longevity of the well. Rather than expending capital on a diminished resource, the City is planning to invest in a new production well to replace Well No, 1. The preferred location for the new production well is near the existing Well No. 1 to reduce costs associated with relocating the raw water discharge piping and associated electrical and 11C equipment. It is assumed that the existing electrical power is sufficient and only new wiring and conduit will be required. It is also assumed that a new control panel will be provided and associated control wiring and conduits but that there is an existing PLC that can be reused. A structural pad and protection fence will be provided; a well house will not be included. Based on the City's operational records, Well No. 1 was producing approximately 1,000 gpm prior to the onset of excessive sand pumping. The City indicated that the well was originally capable of pumping more than 2,000 gpm, similar to the other wells at the North Station Well Field. It is possible that a new well may be capable of producing quantities of water similar to the original capacity, and the City wishes to maximize the capacity from the new well. The following tasks will be performed as part of this scope of services. (Exhibit A — Engineer's Services) EJCDC E-500 Agreement Between Owner and Engineer for Professional Services Copyright © 2008 National Society of Professional Engineers for EJCDC. All rights reserved.