Planning Horizontal Directional Drilling for Pipeline Construction

9.2.1 Geotechnical Investigation
the geotechnical report containing geotechnical, geological and other information
acquired during the feasibility study (e.g., geophysical survey results) and
including a proposed No Drill Zone (with or without a description of the design
drill path), should be provided to the contractor for determining a contract price
for the drill.
since unknown or unexpected ground and subsurface conditions may occur during
the course of the drill, mitigation upon encountering differing ground conditions
should be included in the contract.
9.2.2 Existing Underground Utilities
The owner should locate all existing utility lines and identify them in the bid
package, since they may affect the drill path and No Drill Zones;
The contractor should be obligated, upon conditions set forth in the contract to
have an onsite verification performed prior to the drill, the liability should be
placed on the contractor for marked utilities while the liability should be placed
on the owner for unmarked utilities;
General liability insurance should be carried by the contractor ensuring the
insurance covers underground collapse and explosions
9.2.3 Documentation / As-builts
9.2.4 Access
As-built drawings and a summary as-built report should be completed based on
down hole survey data or the walkover location system;
As-built drawings and the as-built report will protect the contractor and owner
from future problems (e.g., future projects in the same area);
The drawings should have calculated x, y and z positions every 10 m (or other
interval identified by the owner) along the alignment
It should be the owner’s responsibility to acquire access to the drill site prior to
construction, since it is the owner that will have a long term relationship with
landowners affected by the right-of-way or construction works;
All access agreements relevant to the hdd project should be provided to the
contractor prior to construction
September 2004 Planning Horizontal Directional Drilling for Pipeline Construction Page 9-2