Repair water main and sinkhole on massey avenue onboard naval station mayport

The contractor shall remove all existing sinkhole washout and debris from the nearby storm

water culvert and the existing sinkhole area to successfully accomplish this repair work.

3. The Contractor shall remove existing broken 12†water main, and provide a Type B crossing

beneath the existing storm water pipe per the detail provided on page 3 of this Statement of

Work. A minimum of 12†of vertical clearance shall be provided between the bottom of the

existing storm water pipe and the crown of the water main. The new potable water pipe that is

installed for this utility transition is to match the existing ductile iron pipe material and

restrained mechanical joints shall be utilized in accordance with pages 3 and 4 of this statement

of work.

4.

The Contractor shall investigate the depth of the existing 24†water main running parallel to the

12†water main to confirm that a minimum of 12†is provided between the bottom of the storm

water pipe and the crown of the water main. The contractor shall dig no more than 24†below

the existing storm water pipe to confirm the minimum 12†clearance exists.

The Contractor shall restore the bedding material layer beneath the existing storm pipe. The

bedding material shall consist of clean sand (SP or SM). The thickness of the bedding material

layer shall be 12†minimum.

6. The Contractor shall wrap the storm pipe joints with geotextile fabric type Dâ€3 and install in

accordance with the FDOT design standards, index no.

280, sheet no. 1 attached to this SOW.

7. The Contractor shall neatly sawcut and remove the existing asphalt pavement at least 5 feet

from edge of failed pavement. The limits for removal of existing base course and underlying

material shall be established by offsetting the limits of existing asphalt removal inward (toward

the sinkhole) by 1 foot. This will leave 1 foot of existing base course around the perimeter of the

repair area on which the new asphalt layer can overlap.

8. The Contractor shall provide clean suitable backfill material. The backfill material shall be

compacted to 95% maximum density (ASTM D1557).

9. The Contractor shall construct 12†of stabilized subgrade (LBR 40), 10†base (Group 9), 1.5â€

asphalt structural course (SPâ€12.5), and 1.5†asphalt friction course (SPâ€12.5).

The surface

grades shall match the existing adjacent surface grades with no abrupt changes in grade

elevation at the interface. The typical section for this area is shown within the red box on Tâ€101,

and the design crossâ€section is shown on XSâ€102 with a red box identifying the station nearest

the work area.

10. The Contractor shall construct concrete curb and gutter (Type F) to match the existing adjacent

curb and gutter. The slope of the gutter shall match the existing adjacent curb and gutter to

ensure positive drainage.

11. The Contractor shall construct 4†thick concrete sidewalk to match the existing adjacent

concrete sidewalk.

12. The Contractor shall paint pavement markings on the new asphalt surface in the work area as

shown on SMâ€102.

13.

The contractor is responsible for providing all detour signage, barricades, and traffic cones for

rerouting of traffic for the duration of this sinkhole repair job.

14. The contractor shall flush and chlorinate the newly replaced sections of potable water line and

take two consecutive bacteriological samples upstream and downstream along those potable

water line sections showing that no total coliforms or E. Coli bacteria is present in accordance

with Florida DEP drinking water compliance standards. The contractor shall also ensure any

required boiled water notices and rescissions are distributed to the affected tenants. The

bacteriological results are to be sent to the water system utilities commodity manager.

15.

The Contractor shall install Bahia sod on all nonâ€paved disturbed areas. The sod shall be

adequately watered to promote establishment of the turf.

16. The Contractor shall comply with the applicable specification requirements from the Massey

Avenue Corridor Improvements project (Contract No. N69450â€10â€Dâ€0001). The specifications

from the referenced project shall provide detailed instruction concerning products, testing,

execution, etc. when needed to complete the work.