requirements contracts for engineering design and related services ...

B. SEWER DATA SURVEY
1. The Consultant shall research all available maps, plans, records, etc., and where as built data is missing, take
appropriate field measurements/elevations of existing sanitary, combined or storm water sewers within the limits of the
project, including interceptor sewers.
2. This records search and survey shall determine the locations, elevations and sizes of all existing sewers and
appurtenances, outfalls, manholes, catch basins and drains.
3. The information to be obtained by the Consultant shall include, but not be limited to, the following:
a) Distance from existing sewers’ centerlines to an existing building line;
b) Distance of manholes from the building line in the nearest intersecting street;
c) Existing ground surface elevations and legal grades;
d) Invert elevations of the existing sewers;
e) Internal sizes of the existing sewers;
f) Type of material used, i.e., concrete, brick, vitrified clays in existing sewer construction;
g) Invert elevations of all existing house traps;
h) Location of all mapped sewer easements.
4. The following criteria shall be observed:
a) All measurements and elevations shall be taken at or to an existing manhole.
b) All distance and internal sizes of the sewers shall be measured to the nearest one-tenth of a foot.
c) All elevations shall be measured to the nearest one-hundredth of a foot, using the respective Borough Sewer
Datum.
5. The Consultant shall plot the results of the Sewer Data Survey including the boundaries of all Drainage Areas
located both within and contiguous to the project area, as determined by the water shed limits of all previously completed
drainage plans, existing sewers and ridge lines as may be available.
6. The plotted Sewer Data Survey shall also show the locations of all mapped sewer easements with respect to
mapped street lines, and shall locate and identify all structures and other major features encroaching upon the sewer
easements.
7. The Consultant shall indicate, on the plotted Sewer Data Survey drawings, all locations at which field data were
obtained.
8. The Consultant shall review all data thus obtained, and shall coordinate this data with the Topographic Survey and
the Utility Survey.
9. The Consultant shall reconcile all discrepancies in the location and identification of all sewer elements.
10. The Consultant shall submit, to the Department, original survey notes and survey computations together with all
sewer drawings, plans and plates, which shall become the property of the City.
11. The Consultant shall plot the Sewer Data Survey in accordance with the current Departmental Drafting Standards
and requirements for Topographic and Utility Surveys.
12. The Consultant shall prepare a technical supplement on the Sewer Data Survey and shall incorporate this
supplement as an Appendix to the Preliminary Design Report. The supplement shall include, but not be limited to, the
following factors that may impact upon future sewer construction and/or drainage of the project area:
NYC Department of Design and Construction
Infrastructure, October 2012
GR-42