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REV 9.29.17
<br />10. Provide preliminary alignment of the new stormwater piping along Clarewood Drive. Detail the
<br />connection to the existing collection system on Bugg Lane, and determine the alignment and location of
<br />the connection to the TxDOT IH -35 system.
<br />11. Perform the preliminary hydraulic calculations for both the new stormwater collection piping along
<br />Clarewood Drive, as well as completing calculations along Barbara Drive to prevent ponding along the
<br />road.
<br />12. Identify any possible Low Impact Development (LID) options that may be appropriate for the design of
<br />any water quality features for the project. Based on the Feasibility report, there are no water quality
<br />improvements anticipated with the project. However, in the event modifications to the existing TxDOT
<br />"ditch" are required, LID options such as a rain garden or vegetative filter strip will be investigated, and a
<br />recommendation provided for inclusion into the final design phase.
<br />13. Identify the regulatory agencies that will have authority over improvements within the project area and
<br />identify the necessary permits from those agencies. It is anticipated that TxDOT, Hays County, City of
<br />San Marcos, and TCEQ will require coordination. Coordination with Texas Parks and Wildlife, FEMA,
<br />Union Pacific, US Fish and Wildlife, USACE, and Federal Aviation Administration is not anticipated.
<br />14. Perform the Clarewood PCSWMM Modeling Analysis for the Existing and Proposed systems for the 2-,
<br />5-, 10-, 25-, 50-, and 100 -year storm frequencies as required by TxDOT for documentation in Memo.
<br />Report results, provide profiles, compare flows, and velocities at outfall.
<br />15. Perform the Highway 80 PCSWMM Modeling Analysis for the Existing system both with and without a
<br />flapgate at the Blanco River outfall for the 2-, 5-, 10-, 25-, 50-, and 100 -year storm frequencies as
<br />required by TxDOT. Models will be based off of existing GIS data. Report results, provide profiles, and
<br />prepare exhibits displaying a spatial comparison of flapgate effects.
<br />16. Prepare short Technical Memorandum for submittal to TxDOT, outlining the project, identifying the 2-, 5-
<br />1 10-, 25-, 50-, and 100 -year storm flows that the proposed project would contribute to the existing
<br />TxDOT collection system, and possible improvements to the TxDOT system to accommodate any
<br />increases in flow to the collections system. Also include a write-up of the Highway 80 flapgate analysis
<br />for consideration. Submit the TM to TxDOT and conduct a review meeting with the appropriate parties
<br />to obtain consensus on the proposed conceptual improvements' interaction with the TxDOT system.
<br />17. Coordinate with the COSM to obtain Utility providers with overhead and/or underground utilities within
<br />the project area. Information to be collected includes record drawings, GIS maps, and any other data
<br />that may be available to identify utilities in the area.
<br />18. Based on the collected utility information, identify all utility conflicts associated with the proposed
<br />improvements, and identify possible utility relocations and parties responsible for the design of the
<br />relocations. It is anticipated that any COSM utilities that are in conflict, with the exception of electrical
<br />utilities will be designed under this authorization as noted in subsequent tasks. Design of other utility
<br />relocations will be the responsibility of the utility provider.
<br />19. Develop 30% plans/exhibits for the proposed project improvements. This includes developing plan
<br />drawings of the proposed project site, the proposed stormwater collection improvements, any utility
<br />relocations, limits of proposed Road improvements, and resulting exhibits from the regulatory agency
<br />coordination task. These exhibits will be included in the Preliminary Engineering Report noted below.
<br />20. Develop preliminary construction cost estimate of the proposed improvements. The cost estimate will
<br />be prepared using AECOM's standard method of estimating, and will include a contingency of 25%.
<br />21. Prepare a DRAFT Preliminary Engineering Report, outlining the proposed improvements for the project.
<br />Submit three (3) hard copies and one (1) electronic copy in pdf format for COSM review.
<br />22. Receive and address COSM comments on the Draft Preliminary Engineering Report.
<br />23. Submit the Final Preliminary Engineering Report to the COSM, addressing the comments. Three (3)
<br />hard copies and one (1) electronic copy will be provided.
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