02-10-20 Drainage and Flooding Committee Meeting

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Mr. Lorenzo Wingate City of La Porte January 29, 2020 Revision 3 Page 3 Attachment “A” The purpose of this proposal is to develop a PER,final design plans, and construction phase services for the Bayside Terrace Subdivision Drainage Improvements project.The proposed project area can be seen inAttachment “C”. SCOPE OF SERVICES Preliminary Design Phase Services: Task 1–Preliminary Engineering Report (PER) The Preliminary Engineering Report will summarize findings from the drainage analysis and present alternative options to the City of La Porte for their approval. The PER may consider presenting the project in multiple phases based upon available funding. Preliminary Engineering Report services include: a)Reviewingall available record drawings and drainage reports to determine potential utility conflicts and constraints. b)Performingexisting conditions hydrologic analysis and delineate existing drainage basins to determine drainage boundaries, flowrates, and outfall locations. Existing conditions hydraulic analysis will quantify water surface elevations of roadside ditches. c)Evaluatingthree proposed alternatives: Concrete or asphalt with curb and gutter/storm sewer Concrete or asphalt with roadside ditch system Concrete or asphalt with combination storm sewer and roadside ditch system d)Providingestimated construction costs for each alternative developed. e)Providingprovide a final recommendation to the City of La Porte for their approvalin the form of a report. f)Prepare presentation and attend Drainage Committee meeting to present findings and recommendations. Final Design Services: Task 2-Topographic Survey Topographic survey will be delivered in AutoCAD Civil 3D format with field notes and ASCII files of all points obtained. A DTM will be created to generate 1-foot contours. a)Full topographic survey from ROW to ROW with cross-sections at 100-ft intervals, including: all existing appurtenances, water meters, valves, valve boxes, fire hydrants, improvements within the ROW (landscaping, mailboxes, etc.), trees, driveways, storm and sanitary flowlines, ditch and culvert flowlines, pipe sizes and materials, power poles, fences, etc. Obtain private utility records and incorporate into base drawing.Delineate public ROW based on land property monuments and deed records.Provide RPLS signed and sealed survey control maps in PDF format