SECTION 01010 SUMMARY OF WORK.pdf

SECTION 01010

SUMMARY OF WORK

PART 1 - GENERAL

1.1 DESCRIPTION OF WORK

The work of this contract consists of drilling two (2) drinking water wells at two locations on the Beaverhead-Deerlodge National Forest. The major items of required work include the following:

A. Furnish all labor, materials, equipment, supervision, and transportation required for drilling, casing, and developing two

(2) six-inch potable water well.

1.2 LOCATION OF PROJECT

A. Copper Creek Campground

a. The proposed well drilling site is at the Copper Creek Campground, located on Forest Road 80 approximately 26 miles southwest of Philipsburg, MT. Latitude 46.066977, longitude -113.539053.

B. Springhill Cabin

a. The proposed well drilling site is at the Springhill Cabin, located on Montana Highway 1 approximately 9 miles west of Anaconda, MT. Latitude 46.169732, longitude -113.539053.

1.3 ACCESS TO THE DRILLING SITE

The drilling site will be located within 70 ft. of existing roads. No clearing work or site grading for access will be required.

1.4 BASIS OF AWARD

A. The estimated depth of the wells to be drilled and cased under this solicitation are shown on the Schedule of Items.

B. The depth of drilling and materials estimated, as shown on the Schedule of Items, are for the purpose of establishing a basis of award and an estimated total contract amount. These estimates will in no way obligate the Government to make payment in excess of the actual footage drilled and/or materials used at the bid prices stated by the Contractor. It is the intent of the Schedule of Items to include provisions for all materials and services which might be necessary at the bid prices of the Contractor, but does not make mandatory the use of all materials or services listed.

1.5 NOTIFICATION OF START OF WORK

The Contractor shall notify the Contracting Officer of intent to begin work at least two days in advance.

1.6 CONTRACT TIME

All work shall be completed no later than 30 calendar days after effective date of NOTICE TO PROCEED. NOTICE TO PROCEED will be issued on a mutually agreeable date after award.

1.7 PRE-QUOTE TOUR

There will not be a pre-quote tour. Those desiring directions for reviewing the job site may contact Josh Lattin at the Beaverhead- Deerlodge Supervisor’s office in Dillon, MT, 406 362-7011.

1.8 STORAGE OF MATERIALS

The Contractor will be allowed to store materials at the project site.

Coordinate the location of the storage area with the COR. Materials subject to damage from the weather shall be adequately protected by the Contractor. The Contractor shall be solely responsible for the loss of or damage to all materials and equipment stored at the project site.

1.9 EXISTING UTILITIES

A. Sanitary Facilities: Vault toilet(s) are located near the site.

B. Electrical Power: Not available.

C. Potable Water: Not available.

1.10 STAKING

The well locations will be staked in the field by the COR.

1.11 CLEANUP

A. The Contractor shall keep the work sites free from accumulation of waste materials and rubbish resulting from the work.

B. Before final acceptance of the project, the Contractor shall remove from the project sites all waste materials and rubbish resulting from the work. Rubbish and waste materials shall be disposed of at a State approved landfill.

1.12 MEASUREMENT AND PAYMENT

Measurement and payment for contract work will be made only for and under those pay items included in the Schedule of Items. Measurement and payment for work or materials required to complete the project, which are not included as pay items on the Schedule of Items, will be considered as incidental to and included in the payment for pay items shown.

END OF SECTION

SECTION 15120

WELLS

PART 1 - GENERAL

1.1 DESCRIPTION OF WORK

This section specifies the drilling, casing, and development of water wells intended for use as a potable water source.

The Contractor shall furnish all labor, materials, equipment, supervision, and transportation required for drilling, casing, and developing two six-inch diameter potable water wells.

The desired well yield is five gallons per minute.

1.2 ACCESS TO THE DRILLING SITE

The drilling site will be located within 70 feet of existing roads. No clearing or site grading for access will be required.

1.3 ACCEPTABLE DRILLING METHODS

One of the following drilling methods, with suitable equipment, shall be used:

1. Air Rotary/Percussion.

2. Rotary.

3. Cable Tool.

1.4 STATE CODES APPLY

Except where these specifications are more stringent, all aspects of Contractor's drilling and development of the well, and the abandonment if ordered by the COR, shall comply with applicable State codes including, but not limited to, the following:

A. Title 37, Chapter 43, MCA (Montana Code Annotated)

B. Title 36, Chapter 21, ARM (Administrative Rules of Montana)

1.5 SUBMITTALS

A. Submit one copy of the State Well Driller's Report within 5 days of the completion of the well.

B. Submit borehole material samples at the time of sampling.

1.6 STAKING

The well location will be staked in the field by the COR.

PART 2 - PRODUCTS

2.1 PERMANENT CASING

A. New, black welded steel - ASTM A-53 - Bearing factory markings of conformance.

1. Size, Weight and Wall Thickness - Conform to the following:

Size Weight Minimum Wall (Inches) (Lbs. Per Ft.) Thickness (Inches)

6 17.02 0.250

B. Casing shall have 5-foot minimum lengths, and joints shall be electric arc welded.

2.2 TEMPORARY CASING

New or used steel or plastic with a minimum outside diameter three inches larger than the outside diameter of the permanent casing; to be removed as well grouting progresses. Temporary casing remains the property of the Contractor.

2.3 WELL LINER

A. Material: Polyvinyl Chloride (PVC) pipe with solvent welded joints, PVC 1120, ASTM F480, SDR 26, NSF approved, manufactured specifically to be used as well casing.

B. Size - Inside diameter of 4-1/2 inches.

2.4 DRILLING WATER

Suitable for domestic consumption.

2.5 CEMENT GROUT

A. Mix Proportions - Portland cement with a maximum of 6 gallons of water per sack of cement. Up to 5% bentonite clay, by weight, may be added.

B. Cement - Type I, II, or III Portland cement.

C. Water - Taken from source suitable for domestic consumption.

2.6 BENTONITE

Commercial bentonite, fine grained, impervious, with at least 50 percent bentonite and 0.5 mm maximum size of remaining portion.

2.7 DRILLING FLUIDS

A commercial NSF approved agent used to aid in removal of cuttings.

Bentonite may be used only by approval of the Engineer.

2.8 SAMPLE CONTAINERS

One liter size, sealable plastic.

PART 3 - EXECUTION

3.1 PROTECTION OF GROUNDWATER QUALITY

Exercise precautions to prevent foreign materials and surface water from entering drilled hole.

3.2 SURFACE SEAL

The upper portion of the drill hole (upper drill hole) shall be drilled, cased, and sealed with cement grout or bentonite in accordance with applicable State regulations.

1. Diameter of Upper Drill Hole: Adequate diameter to provide a minimum sealing material thickness of three inches, meaning 1-1/2 inches of sealing material around the outside of the permanent casing on all sides.

2. Depth of Surface Seal: Surface seal shall extend to a minimum depth of 18 feet below the land surface with the following exceptions:

a. Consolidated formations:

(1) Upper drill hole shall extend from the land surface to at least 3 feet into a sound, consolidated formation, but in no instance shall the upper hole extend less than 18 feet below land surface.

(2) Unperforated permanent casing shall be installed to extend to this same depth and the lower part of the casing shall be sealed into the rock formation with cement grout.

(3) Throughout the driving of the well casing to the rock formation, the annular space between the upper drill hole and the permanent casing shall be kept at least one half full with bentonite slurry.

(4) The annular space between the rock formation and the permanent casing shall be tightly sealed with cement grout. The remainder of the annular space to land surface shall then be filled with appropriate sealing material.

b. Unconsolidated formations without significant clay beds:

(1) The annular space between the upper drill hole and the permanent casing shall be kept at least one-half full with appropriate sealing material throughout the driving of the permanent well casing into the aquifer. After the permanent casing is set in its final position, the remaining annular space shall be filled to the land surface with cement grout or bentonite clay grout.

(2) If temporary casing is used to maintain the oversized drill hole, the annular space shall be kept full with appropriate sealing material as the temporary casing being withdrawn.

c. Other special sealing techniques in ARM 36.21.657 through

36.21.660 as required.

3. Sealing of Annular Space Between Casing and Upper Drill Hole:

Place bentonite or cement slurry through pipes, starting at bottom of the area to be filled, and retracting pipes as space is filled, until entire space is filled. Chip or pellet placement may be gravity fed.

4. Temporary Casing: Furnish, install, and remove all temporary casing necessary to support the walls of the upper drill hole while the surface seal is placed. Sealing shall be performed by withdrawing the temporary casing and simultaneously adding the sealing material from the bottom of the space to be sealed toward the surface in one continuous operation.

5. Casing Centralizers: Well casing to be sealed into an oversize drill hole or casing shall be equipped with centering guides to ensure the proper centering of the casing. Guides shall be of steel, at least 1/4 inch in thickness, evenly spaced in groups of 3 or 4 maximum intervals of 20 feet. The spacing between the first two sets of casing centralizers shall not exceed 15 feet.

3.3 CASING INSTALLATION

A. Extension Above Surface: Extend permanent casing approximately 24 inches above ground surface.

B. Joints: Weld casing segments to form continuous, watertight casing in section to be cased. Prepare and weld casing as follows:

1. Cut casing ends square.

2. Bevel end to be joined.

3. Align casing segments.

4. Join segments together using electric arc welder. Use sufficient number of passes to completely fill slot formed.

Proportion placing of weld material to provide a minimum of three full passes within the slot area. Remove slag from welded area between passes.

3.4 SAMPLING OF PENETRATED MATERIAL

A. Sample at every change of material or at 25-foot intervals within the same material. Drill two feet into formation being sampled. Force drilled material out into a clean tub. Allow to settle and obtain representative sample. Place sample into container and label with date, project name, well number, and sample depth.

B. The Government will perform any necessary mechanical sieve analysis of water bearing formation samples.

3.5 PERFORATING

A. Perforation of casing rather than a well screen may be required by this contract, as determined by the COR.

B. Perforate casing in place in hole.

C. Demonstrate perforator on casing in the hole above the 24-inch cut-off line.

1. Perforator Type: Mills Knife or other approved instrument which produces slots approximately 3/8 inch by 2-1/2 inches in size.

2. Placement: Perforations shall be no closer than 25 feet to the ground surface. Perforations shall be located below the lowest expected static water level. Depth and length of perforations shall be approved by the COR.

D. Torch-cut perforations are an acceptable alternative if approved in advance by the COR. Size and spacing of the perforations to be determined by the COR.

3.6 WELL LINER

A. Install steel casing as required for a surface seal and for protection against caving of the hole during the drilling operation. Line the remainder of the hole with a PVC liner, as directed and approved by the

COR.

B. Extend liner from bottom of hole to within five feet of the ground surface. Terminate the upper end of liner with a bell end or coupling.

C. Slot liner transversely to its axis as required to permit entry of water from all water-bearing zones. Size and location of the slots to be determined by the COR.

D. Manufactured slotted PVC pipe is an acceptable alternative to field slotting of the liner. Size and number of slots to be determined by the COR.

E. If necessary to protect the slotted section of liner from caving of material from above, install a rubber formation packer 5 feet above the top of the slotted section of liner. The determination on whether to install a formation packer will be made by the COR.

F. Slotting of liner, installation of slotted pipe, and packer is incidental to the installation of the liner. No separate payment will be made.

3.7 WELL DEVELOPMENT

A. After installing the slotted liner, or perforating the casing, if required, develop well by surge block, surging with air, jetting, or other methods approved by the COR.

B. Do not surge opposite casing perforations or screens. Continue well development until water from well is clear and free of fines.

C. Start surging at a slow rate and gradually progress to a maximum rate.

Continue surging at varying rates until no additional fines can be brought into the well or until directed to stop by the COR.

D. Remove fines from the well as development proceeds.

E. As the well is being developed, well yield shall be measured with use of a five gallon bucket or other method approved by the COR.

3.8 DISINFECTION

Clean and disinfect the well upon completion of well development.

1. Cleaning: Thoroughly clean the well by removing all foreign substances, and if necessary, swab with alkalies to remove oil and grease.

2. Disinfection: Disinfect the well with sufficient chlorine tablets or bleach to provide a chlorine residual of 50 mg/l in all parts of the well. Disinfect as follows:

a. Place tablets or bleach in the well. Agitate well from top to bottom with a bailer or other methods approved by the COR, for at least 15 minutes.

b. After agitating, wash the walls of the casing above the water level thoroughly with water bailed from the well.

NOTE: 1/6 cup of 5.25% household bleach per ten gallons of water is roughly a 50 mg/l chlorine solution.

3. Payment: Disinfection of the well is incidental to the project, and no separate payment will be made.

3.9 TEMPORARY WELL CAP

After completion of cleaning and disinfection, tack weld a steel plate to the top of the casing to serve as a temporary well cap.

3.10 PERMANENTLY ABANDONING NEW WELLS

If the COR directs the well to be abandoned, fill the well completely with neat cement, bentonite slurry, bentonite chips or pellets to within 3 feet of the surface. Cut off or drive casing downward so top of casing is at least 3 feet below the ground surface. Fill remaining hole with naturally occurring soils. Hand rake surface to blend with surrounding ground surface.

END OF SECTION