Specifications include, but are not limited to: 3.1.1 CONTROL, TOPOGRAPHIC, PLANIMETRIC AND CHECK SURVEY 3.1.1.1 Use of publicly available data to generate deliverable must be sited with metadata providing source of data, datum, projection and units of measure. Cite sampling tests to indicate level of precision of data set regarding deliverable. 3.1.1.2 All field surveys will be based upon the NAD83/2011 WV State Plane horizontal datum and the NAVD88 vertical datum. Benchmarks and horizontal control shall be of a permanent nature and established outside of the anticipated limits of construction. The minimum requirements for the installation of control shall be specified in the project Work Directive. 3.1.1.2.1 The Measurement and payment for control surveying shall be ‘per hour’ and shall be inclusive of all requirements herein. No additional payment will be made for this work. 3.1.1.3 Field Surveys for Topographic Mapping – Field surveys will be conducted as needed to establish horizontal and vertical control data for preparation of the topographic map(s) as well as the required check sections and any necessary planimetric locations. The following specifications and stipulations will apply to field survey: 3.1.1.3a The maximum allowable relative horizontal positioning precision is 2 cm (0.07 feet) plus 50 parts per million (based upon direct distance between the two points.) 3.1.1.3b Horizontal traverses shall be closed. Total angular misclosure shall be less than 5 seconds times the number of angles. Horizontal direction shall be referenced to the horizontal datum specified in 3.1.1.2. 3.1.1.3c A baseline shall be established across or in close proximity to the site with permanent objects or conventional surveying markers as directed in Item (d) below. Baselines may be established on pre-existing jeep trails, roads or utility rights of way on or in close proximity to the site. A minimum of three (3) baseline stations shall be monumented by conventional survey markers (e.g. galvanized spikes, rebar with plastic caps, etc.) set flush with the ground surface and referenced by guard stakes, and shall be inter-visible to one another and be tied to the horizontal and vertical control. 3.1.1.3d All field survey control work on the public right of way where possible, however, the WVDEP/AML shall obtain right of way on private property where needed.
