07-27-20 Regular Meeting of the La Porte City Council (2)

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April 22, 2020 Proposal for Survey Page No. 3 ADDITIONAL SERVICES Item-1: Topographic Surveying for Detention Pond Topographic survey will be performed for a proposed detention pond area (size to be determined). Location of the detention pond is not selected yet. Some conceptual options are shown in the attached exhibit. Survey shall conform to all requirements of City of La Porte and Category 6 survey, Condition 2 of TSPS Manual as applicable. In general, the scope for survey will be including the following tasks: 1. Horizontal and vertical controls will be established and tied to the Texas State Plane Coordinate System, South Central Zone NAD 83 and datum NAVD 88. The nearby TSARP monument will also be tied to the survey as benchmark. 2. Limited site clearing of brushes as applicable (if wooded) 3. Survey elevations in a 50’x50’ grid 4. Survey all topographic (with or without trees within wooded area) and utility features. 5. Prepare a plan drawing with DTM/contour in AutoCAD. The deliverables will be signed and sealed topographic survey map. Item-2: Boundary Surveying for Detention Pond Boundary Survey will be done for the proposed detention pond area. Survey will comply with Category 1A, Condition 2 survey of the latest TSPS Manual and City of La Porte survey requirements as applicable/feasible. Horizontal and vertical controls will be established and tied to the Texas State Plane Coordinate System, South Central Zone NAD 83 (CORS 96) and datum NAVD 88. In conformance, the scope of work will include the following: 1. Searching and surveying monuments for establishing boundary of the site. 2. Abstracting and deed research for the pond site and adjoining properties. 3. Preparing plat map drawing for boundary of the site. 4. Preparing metes and bound description for the boundary of the site. 5. Map check closure for the boundary. 6. Setting the boundary on the ground. The deliverables will be signed and sealed boundary plat map and metes and bounds. Item-3: Channel Cross Section Survey Four cross sections will be surveyed along Little Cedar Bayou in the vicinity of the detention pond area. In general, the scope for survey will be including the following tasks: 1. Horizontal and vertical controls will be established and tied to the Texas State Plane Coordinate System, South Central Zone NAD 83 and datum NAVD 88. The nearby TSARP monument will also be tied to the survey as benchmark. 2. Limited site clearing of brushes as applicable. 3. Survey four channel cross sections including elevations at flowline, toe, high bank, water level, estimated ROW line, etc. 4. Prepare a plan drawing with surveyed cross sections in AutoCAD.