12–2 (210–VI–NEH, May 2001) 7. Developing
Following filter material placement and when specified in section 13 of this specification, the well shall be devel-oped by an approved method. The contractor shall submit a plan for accomplishing the work to the engineer for review before development of the well.
All materials pulled into the screen during development shall be removed. Filter material shall be added to the an-nular space around the screen as needed to maintain the top of the filter at the specified elevation.
Any well that continues to produce appreciable amounts of fines for 4 hours after development will be abandoned and relocated unless otherwise continued by the engineer.
8. Backfilling
After the well has been developed, the annular space around the riser pipe above the filter material shall be filled with selected moist impervious earthfill or portland cement concrete. Backfill shall be placed in layers not to ex-ceed 12 inches in thickness, and each layer shall be tamped firmly into place. The temporary casing shall be with-drawn in increments as the backfill is placed.
9. Abandoned wells
All abandoned wells shall be plugged as specified in section 13 of this specification. When a well is abandoned after development, the well screen and riser pipe shall be salvaged, if possible.
10. Logging and sampling
The contractor shall conduct drilling operations in a manner that allows the engineer to take representative dis-turbed soil samples of all materials encountered.
11. Measurement
Method 1—The amount of well drilling is measured to the nearest foot of well drilled and cased. Wells abandoned for causes other than the fault of the contractor will be included in the measurement for payment.
The volume of filter material and backfill material is computed to the nearest 0.1 cubic yard from measurements of the vertical well space occupied by each and the outside diameters of the casing and riser. Filter material and backfill material for wells abandoned for causes not attributed to actions of the contractor will be included in the measurement for payment.
The amounts of pipe and well screen installed in the riser and outlet assembly are measured to the nearest linear foot at the time the riser is assembled. Pipe and well screen that cannot be salvaged from wells abandoned for causes not attributed to actions of the contractor will be included in the measurement for payment.
The couplings and special fittings and appurtenances are counted at the time the riser is assembled. Couplings and special fittings and appurtenances that cannot be salvaged from wells abandoned for causes not attributed to ac-tions of the contractor will be included in the measurement for payment.
The time required to develop each well is measured to the nearest half hour. Time required to develop wells aban-doned for causes not attributed to actions of the contractor will be included in the measurement for payment.
Method 2—The amount of well drilling is measured to the nearest foot of well drilled and cased. Wells abandoned for causes not attributed to actions of the contractor will be included in the measurement for payment.
The volume of each grading of filter material placed is computed to the nearest 0.1 cubic yard from measurements of the vertical well space occupied by each and the diameters of the casing and riser. Filter in wells abandoned for causes not attributed to actions of the contractor will be included in the measurement for payment.
The amounts of pipe, couplings, fittings, appurtenances, and well screen installed in the riser and outlet assembly are measured to the nearest linear foot at the time the riser is assembled. Pipe, couplings, fittings, appurtenances, and well screen that cannot be salvaged from wells abandoned for causes not attributed to actions of the contrac-tor will be included in the measurement for payment.
The time required to develop each well is measured to the nearest half hour. Time required to develop wells aban-doned for causes not attributed to actions of the contractor will be included in the measurement for payment.
Backfill is not measured.
12. Payment
Method 1—Payment for each item of work will constitute full compensation for all labor, equipment, materials, and all other items necessary and incidental to the completion of the work included in the item.
Payment for drilling and casing each size of well is made at the contract unit price for that size of well and will include compensation for drilling, casing, and pulling casing.
Payment for furnishing and placing filter material is made at the contract unit price for that grading of filter material.
Payment for furnishing, placing, and compacting backfill is made at the contract unit price.
Payment for furnishing and installing each type and size of pipe is made at the contract unit price for that type and size of pipe.
Payment for furnishing and installing each type and size of well screen is made at the contract unit price for that type and size of well screen.
Payment for furnishing and installing each coupling is made at the contract unit price for that type and size of coupling.
Payment for each special fitting or appurtenance is made at the contract unit price for that type and size of fitting or appurtenance.
Payment for developing each well is made at the contract unit price for developing that size of well.
Method 2—Payment for each item of work will constitute full compensation for all labor, equipment, materials and all other items necessary and incidental to the completion of the work included in the item.
12–4 (210–VI–NEH, May 2001)
Payment for drilling, casing, and backfilling each size of well is made at the contract unit price for that size of well and includes compensation for drilling, casing, pulling casing, and backfilling.
Payment for furnishing and placing filter material is made at the contract unit price for that grading of filter material.
Payment for furnishing and installing each type and size of pipe complete with all couplings, fittings, and appurte-nances (except well screens) is made at the contract unit price for that type and size of pipe.
Payment for furnishing and installing each type and size of well screen is made at the contract unit price for that type and size of well screen.
Payment for developing each well is made at the contract unit price for developing that size of well.
Method 3—Measurement is not made. Items of work listed in the bid schedule for installing, operating, and remov-al of relief wells will be paid for at the contract lump sum prices. Such payment will constitute full compensation for all labor, equipment, tools, and all other items necessary and incidental to the completion of the work.
All methods—The following provisions apply to all methods of measurement and payment. Compensation for any item of work described in the contract, but not listed in the bid schedule is included in the payment for the item of work to which it is made subsidiary. Such items and the items to which they are made subsidiary are identified in section 13 of this specification.
13. Items of work and construction details
Part 642
Construction Specification 13 is applicable to the furnishing and installation of timber piles, steel piles, steel sheet piles, precast concrete piles, and shells for cast-in-place piles. It is not applicable to the installa-tion of drilled, cast-in-place piles.
2. Material specifications
The following material specifications complement Construction Specification 13:
511—Steel Piles 512—Wood Piles
513—Precast Concrete Piles 514—Cast-in-Place Concrete Piles
Include Construction Specification 31, Concrete for Major Structures, or 32, Structure Concrete, as ap-propriate, when not included in the contract for other concrete installation.
3. Included items
Items to be included in construction specifications and drawings follow:
a. Plan showing the location of all piles, including test piles, if any.
b. Foundation profiles and sections showing:
(1) Log of borings, including penetration test results
(2) Required or estimated pile penetration (3) Cutoff elevations
c. Required bearing capacities. (Note: Specify (1) required bearing capacity or (2) required pen-etration or (3) required bearing capacity and minimum penetration, as appropriate.) d. For timber piles, state the type, class, species
and length of piles required. For Type I piles, state where the piles will be inspected. For Type II piles, state the type of treatment and minimum retention of preservative per cubic foot of pile.
e. Details of precast or cast-in-place concrete piles including dimensions, reinforcement de-tails, class of concrete, size of aggregate, and type of cement and slump required.
f. Nominal size and weight of section for H-bear-ing piles.
g. Authorization to use gravity drop hammers, if appropriate.
h. Details of load tests that will be required, if ap-propriate.
i. Methods of measurement and payment if the standard specification includes more than one method.
4. Methods
Section 12, Measurement and payment
Methods 1 and 2—Intended for use when a consid-erable number of piles of about the same length are required. Method 1 provides for a single pay item for furnishing and driving piles. Method 2 provides for sep-arate pay items for furnishing piles and driving piles.
Method 3—Used when the lengths of piles required are quite variable. It is particularly suitable where the cut-off portions of the piles may be salvaged and used on the job, such as when steel bearing piles are specified.
Method 4—Used for sheet pile walls when the re-quired depth of penetration is known.
When specifications are prepared using electronic procedures and all methods but one are deleted for use in the contract specification, delete from the last paragraph, All Methods—The following provisions apply to all methods of measurement and pay-ment. Left justify the remaining text.
5. Items of work and construction details Starting at the top of page 13–5, prepare and outline job specific "Items of Work and Construction Details"
(IWCD) in accordance with these instructions.
Instructions for use