Amendment No 1 to PSA - Danch Harner & Assoc - Small Drainage Design and Repair Project (2)

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EXHIBIT 1A SMALL DRAINAGE PROJECTS - BASIC SERVICES Defined Project Scope: The goal of the project is to improve the drainage conditions in/near/around Overlook Court and adjoining properties. The existing stormwater basin southeast of the Overlook Court cul-de-sac is to be utilized but not significantly altered, except for some possible outlet control erosion control measures. The scope entails two areas of focus, the area north of Overlook (upstream storm system) and the area south of Overlook and east of Sampson Street (includes backyard area of adjacent properties). The tasks shown in this exhibit have been modified from the original agreement to redefine the scope of work for the Overlook project. The existing system in Overlook Court is undersized to provide needed capacity of the collection system through the area. The south area outcomes include an improved grading/drainage from rear of homes along Sampson Street/Overlook Court to the basin. This could simply be grading/clearing or entail more detailed stormwater collection system. Possible outcomes for the north area include an additional/replacement pipe system to the storm inlets farther south that outlet into the basin, a (deeper) bore under public rights -of -way to provide additional volume capacity of storm collection system to the basin, and any other method to improve the drainage from the north, to the basin. Dedication/acquiring of easements may also be required based upon final design features. DHA will provide options (channelized and/or piped) on City property/easements to capture ponded water for Phase I area. Options to include preliminary design and cost estimates, and listing of impacts to/for City and residences. DHA will also provide as part of Phase II design for a storm sewer from an existing location in Sampson Street to the existing basin, if the preliminary design in Phase I does not satisfy the storm sewer issue within Phase II area. Final designs shall include the clearing and re -planting of trees and landscaping elements, and easement acquisition costs as required, in addition to the complete set of design plans and specifications. Bid to be opened December 10, 2019 with awarding later in the month. Construction is to be slated for 2020, with construction beginning in April and completed by mid -June of same year, or earlier depending on scope of work. Engineer shall perform: Task 1 — Topographic Survey Engineer shall perform all topographic survey of the specific areas of concern, Phase I and Phase II. Underground and overhead utilities and recorded plat easements will be included, in addition to spot elevations, and other topographic features within the project area. Completion: September 27, 2019