There are never any excavations with drilled shafts.

Not addressed in the Standrd Specifications

Not to be excavated before the drilling of the shaft

To be excavated before the drilling of the shaft

To be addressed as part of the Drilled Shaft Installation Plan

Monitor Structures A & B

Monitor Structures A, B, C, & D

No monitor is required.

Monitor all Structures

Monitor Structure A only

Water Method, Natural Slurry Method, Polymer Method & Mineral Slurry Method

Air Lift Method, Bailing Bucket Method, Tremie/Pump Method & Downhole Pump Method

Dry Method, Wet Method, Casing Method & Permanent Casing Method.

Dry Method, Wet Method, Casing Method, & Tremie/Pump Method

The Standard Specifications do not address specific methods.

Excavate 10 ft of shaft first, excavate shaft to 20 ft, then push casing down to 15 ft

Install casing down to 15 ft first, then excavate shaft to 20 ft.

Excavate 5 ft of shaft first, excavate shaft to 20 ft, then push casing down to 15 ft

Excavate 15 ft of shaft first, then push casing down to 15 ft, then excavate shaft to 20 ft

Excavate 20 ft of shaft first, then push casing down to 15 ft

8.5 feet

5 feet

7.5 feet

6 feet

Enough length to provide surface caving

111.9 feet

92.6

126.9 feet

110.6 feet

123.9

0.69 feet

1.03 feet

0.52 feet

0.37 feet

1.40 feet

They could be made of corrugate metal

The ID (inside diameter) must be atleast equal than the specified shaft diameter less 1 foot

They have to be left in place

They cannot be deeper than 5 ft below ground

The ID (inside diameter) must be at least equal than the specified shaft diameter less 1 inch.

The casing is temporary casing left in the hole and the Contractor should not be paid for the casing

The casing is considered temporary and the Contractor should be paid for the casing

The casing is permanent and the Contractor should be paid for the casing

The casing is considered permanent, but the Contractor will only be paid if he does not exceed his total bid price

The casing is permanent and the Department will pay half the cost of the casing

To determine shaft tip elevations and/or authrozied installation criteria for the drilled shaft

To determine what diameter of shaft to construct

When the Contractor has difficulty in drilling the shaft with conventional methods

To assist the Contractor in determining what excavation tools will be required to drill the shaft

15 feet deeper than the deepest shaft shown in the Plans

Determined by the inspector

To the depth shown in the Contractors Drilled Shaft Plan

20 feet deeper than the deepest shaft shown in the Plans

3 times the diameter of the shaft below the shaft tip elevation

Density

Viscosity

All of the above

Salt Content

pH

The shaft has an average depth of sediment of less than 1.2 inch and is acceptable

The shaft has an average depth of sediment of 0.84 feet and is unacceptable

The shaft has more than 50% of the base with 1/2" or more of sediment, and is unacceptable

The shaft has a maximum depth of sediment of 1.44 inches and is acceptable

There is insufficient data provided to evaluate the shaft bottom

Perform three consecutive tests on the same fluid and if the tests are the same (within 0.1 pcf), then the balance is okay

Use some fresh water (usually available from the water keg) and test the water. The weight should be 62.4 pcf. If it does the mud balance is okay.

Perform a Sand Content Test. If the results of the Sand Content tests are within the specification limits then the balance is okay

Keep a standard weight fluid such as gasoline to check the weight

Run three or more random tests on the same sample of slurry. If the results are within 0.1 pc, the mud balance is acceptable

The bottom of the shaft has less than the maximum of 1 1/2 inches of sediment over the base and is acceptable

The bottom has more than the 1/2 inch of sediment over more than 50% of the base and is not acceptable

Bottom hole cleanliness is not required for this type of project by the 455 Specfications

The cleanliness is stisfactory so long as the 36 hour time limit is not exceeded

The Bottom of the shaft has less than one inch of sediment as required for misc. shafts up to 60 inches in diameter and is acceptable