PSA - Arcadis - North Station Well #1 Replacement Design

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should not be too near such that new production well would be placed in a zone of plugging of the aquifer material that likely surrounds the existing Well No. 1. Prior to selecting the well location, discussions will be held with IDEM to establish the sanitary setback radius that will be applied to the new production well. Arcadis will then select a potential well site and assess the area surrounding the site to ensure compliance with the sanitary setback regulations. Arcadis will attend one site visit to the well field property and visually inspect the well site area for potential contamination sources and other structures that may be prohibited by the sanitary setback regulations. Arcadis will also review the City's Wellhead Protection Plan documents and perform an additional search of environmental databases to identify recorded potential contaminant sources in the vicinity of the well field. We have assumed a $300 budget based on past experience. Arcadis will also review storm and sanitary sewer records available from the City to ensure no alignments exist within the proposed setback. Once a suitable site is selected, Arcadis will stake the location of the proposed well and measure the coordinates of the location using a hand-held global positioning system device. In addition to potential sources of contamination, Arcadis will inventory existing water users (private and industrial wells) within the vicinity of the well field that could be affected by increased withdrawals. A map will be produced showing the relationship of these wells to the well field and the estimated drawdown that would be expected at each well. If there is a potential for significant impacts to the existing water users, a detailed well survey procedure can be developed at this time to determine if the predicted drawdowns will have an adverse effect on the existing wells. Because the number of existing water users within the influence of the well field is unknown, costs for performing a detailed survey are not included in this proposal. Task 4. Well Site Application Arcadis will prepare and submit a Well Site Application to IDEM for the production well site selected during the well siting evaluation. In addition to location, property ownership, and geological information, the application requires submittal of an inventory of potential contaminant sources within a 3,000-foot radius of the proposed new production well. Arcadis will tabulate and map the potential contaminant sources identified from the environmental database search and Wellhead Protection Plan documents review completed as part of Task 2 for submittal with the application package. Once the submittal is complete, a site visit with the IDEM regulators will be required for inspection of the well location and surrounding area. Arcadis personnel will schedule and attend the site inspection visit with the IDEM regulators. It should be noted that a standard condition for well site approval by IDEM is the requirement to perform temperature and bacteriological monitoring on the production well (once operational) to determine whether the well is under the direct influence of surface water. Task 5. Test Drilling Upon receiving well site approval from IDEM, Arcadis will plan and oversee the installation of a test boring at the new production well location to collect geologic samples of the aquifer material and facilitate the design of the new well. The test boring will be drilled using rotosonic techniques. The rotosonic drilling method does not use drilling mud and produces high -quality continuous core samples of the subsurface. Prior to drilling, Arcadis will develop simple specifications for the solicitation of bids from a minimum of three qualified rotosonic drilling contractors. The specifications will outline the details of the test drilling, including depth, diameter, and sampling requirements. Arcadis will provide a recommendation to the City regarding the selection of a drilling contractor based on the proposed drilling costs and availability. It is assumed that City will contract directly with the selected drilling contractor to install the test boring. (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.