Survey Control Network Clause Samples

Survey Control Network. Establish a network of horizontal and vertical survey control throughout the Project survey area. Install all control monumentation to withstand movement and/or deterioration by seasonal weather influences for a minimum of two years. Select control locations to minimize the probability of disturbance by construction activities and allow for easy location and recovery at a later date. Reference, horizontally and vertically, all field survey information collected to the base control network. Provide a list of computed XYZ coordinates with descriptions for all control points, survey points, and property monuments associated with the surveys to District. Establish temporary Project benchmark(s) for vertical control by closed-loop level surveying. Base vertical datum upon County record Datum. Datum shall be National Geodetic Vertical Datum 1929 (NGVD) unless otherwise directed by District. Assumed elevation datums are not acceptable. Clearly depict and note County permanent benchmark(s) referenced for the Project with a record description on the survey base map. Identify and describe Benchmarks beyond the immediate Project survey area by narrative on the survey base map. Control network points may be a combination of scribes or P.K. nails in hard surfaces, wooden hubs with tacks, or iron rods designated as control points with red plastic or aluminum caps. All points shall be clearly marked with durable marking paint in hard surface or travelled ways and with four- foot lath and ribbon in areas outside pavement, traveled ways, or other hard surface areas.
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