requirements contracts for engineering design and related services ...

the Consultant, it is infeasible to comply with the 2% maximum sidewalk cross slope and 5% maximum longitudinal
ramp slope requirement(s) of the Americans with Disabilities Act Accessibility Guidelines;
f) In conjunction with the mitigation of adverse property and street impacts (including substandard longitudinal
gutter grades, street trees, shrubs, fences, walls, sidewalk removals, addition of entrance steps and access/egress
solutions) the Consultant shall develop the "best technically feasible fit" top of curb for each block face and each
individual property and intersecting street, through the performance of a detailed grade analysis and design, which
shall consist of an intensified study and a reiterative design process for proposed grades on curb and sidewalk, and
integrating into the detailed design process all of the factors listed above which will affect the desired solution;
g) Perform topographic surveys to obtain additional survey data including spot elevations to "fully support" the
detailed grade design and reiterative grade design process where needed;
h) Locate and plot customized profiles, which shall require pre-approval by the City, for the purpose of executing
the detailed analysis and design of project grades. Locate and plot customized cross sections, which shall require
approval by the City, for the purpose of executing the detailed analysis and design of project grades;
i) Develop/design roadway crowns and/or cross slopes within the framework of Departmental or other approved
standards and the existing crowns and cross slopes for streets abutting and/or intersecting the project limits;
j) Design sidewalk pavement grades at and into all intersections and terminal streets to meet the existing
conditions and/or the proposed design in each intersecting street. The application and/or use of transition areas to
satisfy this design requirement shall, for the purposes of this program, not be considered an adequate level of study
and or design;
k) Reiterate the foregoing grade study and design requirements, until a "best fit" grade design is achieved,
including, but not limited to: the plotting and study of additional profiles; plotting and study of additional cross
sections, the securing and study of additional topographic data as described above, and as needed to meet/comply
with the specific site constraints and specific site issues including, but not limited to, street/roadway drainage,
required cover for storm sewers, drainage of private properties, and the Americans with Disabilities Act Accessibility
Guidelines;
l) Incorporate and integrate the proposed design grades into the composite Contract Drawings and with other
affected project components;
m) Prepare a "grade change exhibit" for the entire project site, in accordance with the current DDC standards and
requirements in the standard format prescribed by the Department in coordination with the Topographical Bureau of
the respective Borough President's Office, identifying all locations where the proposed design grades vary from the
existing Legal Grades. Information regarding Legal Grade Maps and samples of Legal Grade Maps for different
Boroughs is included on the following pages.
NYC Department of Design and Construction
Infrastructure, October 2012
GR-51