Page 255 - Villas at Savona Close-out Manual

5.1 PREPARATION.
Provide a pavement profile from laser level measurements of each area to be raised to
determine the extent of the pavement that requires adjustment. Ensure that the finished
concrete slabs will conform to the grades and cross-sections of the slabs as shown in the plans
or as directed. Determine the exact locations of the injection holes at 3 to 6 feet intervals for
each treated area. Obtain approval for the final proposed grades and injection hole locations
before beginning work.

5.2 DRILLING

A. Establishing Grout Holes. The grout holes can be produced either by drilling or driving a
temporarily plugged casing. The method used shall be capable of penetrating rocks and other
obstructions. Regardless of the method used, the casing shall be in tight, intimate contact with the
surrounding soil of the resulting hole so that it is firmly held in place and resistant to ejection
from the grout pressure and/or leakage of grout around the perimeter.

B. Hole Location. Hole locations shall be indicated on the plans. The exact location, depth, and
spacing of the grout holes is subject to change, as directed by the engineer during the performance
of the grouting program.

C. Control of Drilling Circulation Flush. Water or other circulation media shall be captured and
directed to an approved disposal location. Ponding of uncontrolled drilling flush or wastewater in
the work area shall not be permitted. Settling tanks or other devices to separate drill cuttings and
other solids from the water shall be used when required.

D. Water Injection. The injection of water into the drilled holes in addition to any remnant water
from the drill circulation may be required or prohibited by the engineer, depending on the exact
soil conditions encountered.

5.3 GROUT INJECTION

A. In general, alternate primary holes shall be grouted first, followed by the intermediate secondary
holes.

B. Depth ConFIrmation. The actual depth of the open grout hole shall be confirmed by measuring
with a proper weighted measuring tape or line immediately before connection of the grout
delivery line. The measured depth shall be noted. If it is less than the planned depth, the hole
shall be re-drilled to proper depth before grouting.

C. Sequence. The sequence in which the holes are drilled and grouted is subject to the approval of,
and may be modified by, the engineer. Grout injection shall not be initiated into any hole within
12 ft of a hole grouted within the previous 12 hours (Cement grout only). Holes located on or
near a downslope of the treatment area, or near a retaining wall or structure foundation element,
shall be injected before holes that are located more distant from the outer edge of the treatment
area.

D. Grout Staging. Holes shall be injected in ascending stages, starting at the bottom and working
upward. No stage shall be injected until the immediately underlying stage has been completed.
Individual stage lengths shall be a minimum of 1 ft and a maximum of 4 ft high.

7
HEERUP ENGINEERING, PC January 16
Villas at Savona 03229