Laserfiche WebLink
Northeast Drainage Ditch Restoration - Phase 1 April 23, 2012 <br /> Scope of Services-Onsite Engineering,LLC Page A-I of 6 <br /> Scope of Services- Topographic Survey, Final Design Phase, Bidding Phase, Construction <br /> Survey and Layout Phase <br /> The following Scope of Services details tasks required to perform a topographic survey, <br /> research the existing plans and field conditions, prepare a complete set of Plans and <br /> Specifications, assist the City of Decatur in the bidding process,and provide control points for <br /> the construction phase for Phase 1 of the Northeast Drainage Ditch Restoration Project. The <br /> Surveying Services for this Project will be provided by R.W. Lamb & associates, LLC. Phase I <br /> of the Project includes approximately 1.8 miles of existing drainage ditches and one detention <br /> basin (7.8 Acres). The Project Limits of Phase I of the Northeast Drainage Ditch Restoration <br /> Project includes the existing drainage ditch extending south from Spring Creek to Basin 1,Basin <br /> 1, and the existing drainage ditch from Basin 1 to 27th Street. The Phase 1 Project Limits of the <br /> existing drainage ditches and detention basins to be restored are shown on attached Map, PL-1. <br /> Topographic Surveys(R.W.Lamb& Associates, LLC) <br /> Task Description <br /> 1 Horizontal Control <br /> a. Recover horizontal control points used for previous plans. <br /> b. Establish new control points using GPS and Total Station methods. <br /> c. Establish tie points to recover control points for construction. <br /> 2 Vertical Control <br /> a. Recover Benchmarks used for previous plans. <br /> b. Establish new Benchmarks along entire project limits using <br /> conventional leveling methods. <br /> c. Convert NAVD 88 datum benchmarks to City of Decatur datum. <br /> 3 Locate Property corners <br /> a. Locate property corners along entire project limits. <br /> 4 Cross Sections <br /> a. Cross Section ditch segments at 100 foot intervals to match <br /> previous plans. <br /> b. Cross Section basin areas at intervals to match existing plans. <br /> 5 Locate drainage structures <br /> a. Locate center of inlet or manhole. <br /> b. Identify size and type of structure. <br /> c. Measure pipe inverts and diameters. <br /> d. Locate box culverts. <br /> e. Identify size and measure invert elevations. <br /> f. Locate other structures as needed. <br />