A.5 Surveys and
General Requirements. Surveys should generally contain
the following information:
Geotechnical Reports
Locations of all permanent features within limits of
work, such as buildings, structures, fences, walls,
concrete slabs and foundations, above-ground tanks,
cooling towers, transformers, sidewalks, steps, power
Site Survey
and light poles, traffic control devices, manholes, fire
hydrants, valves, culverts, headwalls, catch basins or
Site surveys are generally prepared for GSA projects
inlets, property corner markers, benchmarks, etc.
involving sitework. The survey may be contracted
separately by GSA or may be included in the scope of the
Location of all adjacent and abounding roads or streets
A/E for the project. The guidelines given here apply in
and street curbs within limits of work, including
either case. In cases where GSA contracts for the survey
driveways and entrances. Type of surfacing and limits
directly, the A/E may be requested to review the scope of
should be shown. For public streets, right-of-way
work for the survey and recommend modifications to the
widths and centerlines should also be shown.
technical requirements to suit the specific project site. The
Location of all trees, shrubs, and other plants within
geotechnical report must be available to all contractors so
limits of work. For trees, caliper size should be shown;
that there would be a common reference on which to base
dead trees should be indicated.
their bids. Also, the report would subsequently function as
Location of all overhead telephone and power lines
the basic reference for evaluating "changed conditions" or
within the limits of work and their related easements.
"differing site conditions" during construction and,
Based on existing records, location of underground
therefore, need be of sufficient detail, number of borings,
utilities, such as gas, water, steam, chilled water, electric
groundwater, and contamination evaluations to support
power, sanitary, storm, combined sewers, telephone, etc.
the design and mitigate large changed conditions issues.
should be shown. Sizes of pipes (I.D.), invert elevations,
The criteria listed here are not absolute; they should be
inlet or manhole rim elevations should be indicated.
modified by the civil engineer to suit the particular
Where appropriate, information should be verified in
conditions of the project. All surveys should be prepared
the field.
and sealed by a surveyor licensed in the state where the
Based on existing records, location of underground
project is located.
storage tanks or other subsurface structures.
Topography field criteria should include such items as
300 millimeter or 600 millimeter (1 to 2 foot) contour
intervals plotted on a grid system appropriate to the
scale of the survey; elevations at top and bottom of
ditches and at any abrupt changes in grade; periodic
top-of-curb and gutter elevations, as well as street
centerline elevations; elevations at all permanent
features within the limits of work; ground floor eleva-
tions for all existing buildings.
348 F A C I L I T I E S S T A N D A R D S
FOR THE
PUBLIC
BUILDINGS
SERVICE
A.5 Surveys and Geotechnical Reports Site Survey
Revised March 2005 PBS-P100
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