Res 2015-160/approving a professional engineering services agreement between the City and Unintech Consulting Engineers, inc. for the provision of professional services in connection with the Mill Street Improvements project in the not-to-exceed amount o

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Attachment A City of San Marcos Mill Street Improvements SERVICES TO BE PROVIDED BY THE ENGINEER The Engineer shall provide the necessary engineering and technical services for the preparation of plans, specifications and estimates (PS &E) detailing the construction of roadway improvements along Mill Street in San Marcos, from 100 feet southwest of the intersection of Mill and Uhland Road, northeast approximately 1,500 linear feet to tie to the new section previously constructed, and 100 feet along each leg of Uhland Road at the intersection. The construction plan set (plan set) for this project shall contain the required drawings and details pertaining to grading, paving, signing, pavement marking, street lighting, sequence of construction, traffic control and drainage. They will also include analysis of existing bus stop at Mill / Uhland, and the signalization of the intersection at Uhland/Mill only if traffic study concludes that signals are warranted. If warranted standard drawings and details pertaining to traffic signal installation shall be included in the plan set. The plan set shall be prepared in English units and shall be suitable for the bidding and award of a contract through the City construction contracting system. Design services related to the design and plan production for this project shall be performed in accordance with the latest available City and TxDOT manuals. The Engineer shall establish a roadway geometry model and perform earthwork and paving quantity calculations using GEOPAK. The CADD and GEOPAK criteria files, which comprise the geometry model, shall be provided to the City at the completion of the project. City of San Marcos standards and details will be used, where available. Hydraulic designs and calculations for culverts shall be performed with a PC -based hydraulic model such as HECRAS, CULVERT, WinStorm, Culvert Master or other hydraulic model approved in advance by the City. The culverts shall be sized to accommodate run -off from the subject roadway and run -off from outside the project limits. The Engineer will perform the following tasks either of its own accord or through approved subconsultants. TASK OUTLINE I. ENVIRONMENTAL (subconsultant Horizon) Conduct wetland determination, endangered species habitat assessment, cultural resources investigations detailed as follows: The investigations will be conducted in order to facilitate a "Statement of No Impact" by qualified environmental professional for impacts to endangered species or habitat, archaeological sites, historical structures, wetlands, water of the Unites States and the Edwards Aquifer" if applicable to this project and area of impact. Wetland Determination These efforts will include a review of National Wetland Inventory maps, USGS topographic map, historic and current aerial photography, and the Soil Conservation Service's soil survey and hydric soils list. The field investigation includes a Section 404 (Clean Water Act) jurisdictional determination conducted to confirm the presence or absence of on -site jurisdictional areas (waters of the US and /or wetlands) in accordance with Corps of Engineers criteria. This determination will be conducted according to the routine determination methodology prescribed by the 1987 Corps of Engineers Wetland Delineation Manual and applicable supplements. The prescribed methodology requires documentation of dominant vegetation, soils, and hydrologic indicators for areas to be assessed as jurisdictional. Please be advised that the Regional Supplement requires extensively more documentation of vegetation, hydrology, and soil characteristics than was previously required. Threatened and Endangered Species Habitat Assessment Unintech Consulting Engineers, Inc. 11/4/2015 1 of 8