PSA - Arcadis - North Station Well #1 Replacement Design

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Task 1. Kick-off and Review Meetings Arcadis will meet with the City to kick-off the project including a site visit to perform field investigations, to review the proposed test and production well location, to discuss the results of the test - drilling program (by conference call), to present the preliminary well field design (by conference call), to review the 60% design deliverable(by conference call). Conference calls are proposed to keep the costs down. Task 2. Evaluate Existing/Future Conditions Task 1 will involve establishing the operational objectives (production goals) for the new production well and reviewing existing information to assess whether a new production well can be expected to meet the established objectives. Although overall demands on the water system are declining, demands in the pressure zone serviced by the North Station Well Field are more stable and plans to potentially decommission other existing well fields may increase the burden on the North Station wells. Previous water system studies will be reviewed, and discussion will be held with the City to establish a production goal for the new well. Available operational data from the well field will also be reviewed to evaluate the current hydrogeological conditions in the well field. Data to be reviewed will include pumping rates for each well (both historical and current), water level trend information (static and pumping), maintenance records, the current peak capacity of the wellfield, and any available aquifer testing information. It is assumed that City personnel will be able to provide this information. The purpose of the review is to support estimation of the available capacity that can be expected from the new production well and predict the influence of increased withdrawals from new production well on the other wells in the well field. Installation of new production well and increasing capacity of the well field may have implications relating to the City's agreement with Memorial Hospital. Arcadis will review the agreement language and provide a recommendation on whether any modifications to the agreement will be necessary. In addition, the operation of the new Memorial wells will affect the water levels at the North Station Well Field. It will be necessary to account for the influence of the new Memorial wells to both estimate available capacity from the new production well and to establish the operating conditions (static and pumping water levels) for the new production well. The documents produced by Memorial Hospital's consultants will be reviewed to estimate the influence of the Memorial wells on water levels in the proposed new production well. It should be noted that the intent of the evaluation is to establish probable operating conditions for design of the new production well, and a full assessment of the sustainable yield of the aquifer with the Memorial and North Station Well Fields operating is beyond this scope. Arcadis will also review the baseline capacities established for the North Station Well Field under the Great Lakes Compact and the implications of increasing the production capacity of the well field under the Great Lakes Compact regulations. Additional permitting may be required if the increased capacity is considered to be more than I MGD above the baseline capacity. Task 3. Well Siting A well siting evaluation will be performed to select the location for the new production well. The location will be selected to meet Indiana Department of Environmental Management (IDEM) public water supply sanitary setback requirements outlined in 327 IAC 8-3.4-9. As discussed above, the preferred location for the new production well is near the existing Well No. 1. However, the location Page 2 (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.