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City of San Marcos <br />Sunset Acres Drainage Improvements <br />Attachment A — Scope of Services <br />January 3, 2018 <br />PROJECT DESCRIPTION SUMMARY <br />Alan Plummer Associates, Inc. (APAI) understands that the City of San Marcos desires to make drainage <br />and utility improvements within the Sunset Acres Subdivision. The storm drain system that currently <br />serves the subdivision is undersized. The system drains to a trunk line within the Texas Department of <br />Transportation (TxDOT) right-of-way for Interstate 35. TxDOT is in the early stages of designing <br />improvements to I35 in the area of Sunset Acres. The City has approached TxDOT about increasing the <br />capacity of the trunk line along 135 to receive the 25 -year flow from an upgraded storm drain system. <br />TxDOT has expressed a willingness to cooperate with the City concerning this request. In addition to the <br />storm drain system being undersized, several streets have been repaved such that the gutters have been <br />filled, reducing the carrying capacity. Also, the slopes of the gutters are relatively flat. <br />It is anticipated that the drainage improvements will require a complete reconstruction of the streets to <br />increase the gutter slopes and restore/increase the carrying capacities of the gutters. Additional inlets and <br />increased storm drain sizes will also likely be needed. Since the streets throughout the subdivision will be <br />completely disturbed, the City has expressed an interest in also including some wastewater line <br />improvements as well as some traffic calming improvements as part of the project. <br />At this time, the City intends to move forward with Preliminary Engineering for the project. APAI <br />proposes to complete the following services during this phase. <br />BASIC SERVICES <br />PROJECT MANAGEMENT & QA/QC <br />Includes project set-up/close-out; communication with the City; subconsultant management; managing <br />staff resources, files, budgets, and schedule; project invoicing; and project QA/QC throughout the <br />duration of the project. <br />PRELIMINARY PHASE (30%) <br />A. Meetings. Includes one (1) Kick-off meeting, three (3) project status meetings [one meeting will <br />include traffic calming discussion], one (1) 30% Review Meeting, one (1) public meeting with <br />area residents, two (2) coordination meetings with TxDOT, and three (3) site visits. <br />B. Data Collection and Review. Collect and review previous project records and available base map <br />information including City GIS, aerial imagery, floodplain mapping, and property parcels. <br />C. Provide Topographic Surveying. It is our understanding that the proposed improvements may be <br />phased. As a result, the survey information to be obtained during the Preliminary Phase will be <br />limited that necessary to establish the overall magnitude of the improvements. Detailed design <br />surveys will be conducted as part of the Design Phase. LNV, Inc. will provide topo survey to <br />include: <br />1. Provide horizontal and vertical control for topographic survey. <br />2. Topographic survey limited to the location and flowlines of the existing storm drain and <br />wastewater features, ie. manholes and inlets; street centerlines and gutter slopes. <br />3. Above ground planimetric features, including existing structures and edge of roads will <br />be determined from existing aerial photogrammetry. <br />FEW <br />