O-2004-2717 - Laserfiche WebLink

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Mr. John Joems April 7, 2004 Page 2 of6 includes the excavation of the pond area, the fill associated with the viewing platform, the vertical wall and footing required to support the viewing platform, the grading of the remaining basin area and the installation of the I8-inch culverts and 48-inch outfall structure. After final grading, the surface must be stabilized by revegetation, either by sodding or hydro mulching. We would also recommend that the 4-inch water line be installed at this time to avoid future excavation of the revegetated surface. The pipe can be installed as part of the basic package, but the wet connection to the exiting waterline can be done as part of a later construction phase. Although the elevated viewing platform and associated retaining wall should be included in the basic park package, the pave stones for the viewing platform surface can be easily added in a later phase. During the interim, it is recommended that the surface be revegetated by sodding or hydromulching. Please refer to the attached Exhibit C for a detailed listing of basic park design features and enhanced park features to be included at a later date. In addition, the City desires to investigate the cause of frequent flooding at several intersections along Driftwood Drive along the western boundary of the project and to design improvements to facilitate drainage into the proposed pond in order to alleviate the drainage problems. It is our understanding that the City of La Porte will provide the landscaping plants and materials for the landscaping needs of the park. In addition, it is our understanding that the City will identify a landscape architect/water feature designer to aid in the design ofthe pond. Scope of Work Services to be provided by this firm would consist of the following: 1. Site Visits, Coordination and Meetings: Visit site and attend meetings with client, governing agencies including the City of La Porte, Harris County Flood Control District, Harris County and utility companies as needed for coordination during the design phase and plan preparation. 2. Topographic Survey: It is our understanding that the City of La Porte will provide a topographic survey of all existing surface features and top of ground elevations at 100 foot intervals of the detention basin site. In addition, they will provide top of curb and top of pavement elevations for the section of Driftwood fronting the existing detention basin and the section of Springwood Drive fronting the reserve to facilitate the drainage analysis of Driftwood. 3. Geotechnical Investigation - Provide a geotechnical investigation of the site to determine suitability of existing soil conditions for construction of the amenity pond. Provide recommendations for an appropriate liner should existing soil conditions prove inadequate to properly retain water for the pond. 4. Site Design: Provide plan view drawing(s) of the geometric layout for construction of the park with site features located as required (inc1. 4-inch waterline). Provide full dimension controls for the pond, viewing platform, retaining wall, trails, picnic area, parking lot (inc1. striping), and other misc. improvements. Obtain all required approvals from the City of La Porte, Harris County and Harris County Flood Control District, as required.