requirements contracts for engineering design and related services ...

6. The Datum Plane shall be “as in use” by the respective Borough President’s Office unless otherwise directed by the
Commissioner.
7. Aerial Photogrammetry may be utilized for the preparation of survey plans as outlined in Section E. However, the
Consultant will be required to conduct a detailed Topographical and Utility Survey by using standard electronic/
manual methods to produce utility/composite plans as per the contract specifications.
8. All elements of the Topographic Survey(s) shall be referenced by station and offset to a Center Line Baseline for the
Mapped Street which shall be established/coordinated/tied into the coordinated survey traverse, in accordance with
the current Departmental Standards
9. A stationed R.O.W. centerline baseline shall be provided and tied to the possession and/or R.O.W. lines.
10 All survey work procedures, minimum accuracy, and error of closure standards for traverses and/or Bench Runs
shall conform to specifications required herein.
C. INFORMATION TO BE OBTAINED AND SHOWN
The complete topographical surveys are to be referenced by station offsets to the borough monument lines, or to
base lines established from said borough monument lines or to established building lines in mapped streets, with all
elevations referenced to established borough bench marks or to bench marks set from said borough bench marks.
Where no physical monument system exists the Consultant shall research the survey record diagrams of local
properties to identify fixed points on ground that have known dimensional ties to the legal Block and Lot lines that
abut the project limits. Where no City coordinate system exists, the Consultant must perform the work in the
required NY State Plane Coordinate system. Upon written authorization from the Commissioner, the Consultant may
use an independent coordinate system.
The Topographic Survey(s) shall identify and locate all legal dimensions, property boundaries, and physical features
within the contract limits that are needed to produce a comprehensive design, including, but not limited to, the
following information:
1. Streets, Pavements and Curbs
a. Established R.O.W. width and legal grade of streets and easements. The established R.O.W. width shall be
based on the lines as shown on the Final Maps for each respective borough’s Topographical Bureau Final Map,
or if the street has been revised, shall be based on the lines as shown on the Alteration Map for the same
section of roadway.
b. Location and widths of existing streets, roadways, sidewalks and grass areas; and edge of pavements.
c. Block dimensions. If dimension cannot be obtained from the Final City Map, block dimensions can be obtained
from other sources such as Tax maps, private surveys etc.
d. Block interior corner angles.
e. Location and type of material of curbs, drop curbs, driveways, sidewalks, headers, edges of pavement and
changes in types of pavements.
f. Elevations of the street surface (to nearest hundredth of a foot) at fifty (50) foot intervals including P.C.'s, P.T.’s,
midpoint of corner curbs, and changes in grade that are six (6) inches or greater, taken at the center line of
road, top and bottom of curbs or edge of pavement, back of walk, and right of way line.
2. Properties, Buildings, Walls, Overhead Structures
a. Location and frontage size of the existing buildings abutting the street, identified by house number, type of
building (frame, brick, etc. as well as use such as school, gas station, commercial, residential etc.), and number
of stories, entranceways, together with elevation of first floor, garage entrance and elevation of basement
and/or cellar doors.
b. Lot and block numbers for each building.
c. Location and identification of all abutting tax lots by Lot and Block Numbers (including those encroaching into
the mapped right-of-way).
d. Location of all street encroachments including but not limited to hedges, fences (including height, type of
material), steps, stoops, cellar doors, gratings, and connecting manhole located outside of project limits.
e. Locations, height, width, and type of material of retaining walls.
f. Location and elevations giving clearance of the undersides of overpasses, ramps and bridges and all columns
and abutments for all grade separating structures.
NYC Department of Design and Construction
Infrastructure, October 2012
GR-15