Attachment_0002_LaBarge_Water_Wells__Sitework.pdf

DIVISION 2 SECTION WY-02670

SITEWORK WATER WELLS

Rev. 06-90

WY-02670 - 1

HIGH DESERT DISTRICT NORTH LABARGE COMMON WATER WELLS

PART 1: GENERAL

1.1 SUMMARY:

A. Section Includes: Record keeping, capping of well, disinfection of well, well logging, well abandonment, and mobilization.

1.2 SUBMITTALS:

A. General: Submittals shall be according to Specification 01009 - General Information and

Requirements.

B. Records: Final well logs and reports described in this specification shall be furnished to the

Contracting Officer (CO) in the format agreed upon at the Pre-Work Conference upon completion of the well.

1.3 RELATED WORK:

A. Specifications Sections:

General Information and Requirements Section 01009 Water Well Drilling and Casing Section 02671 Well Testing Section 02672

PART 2: PRODUCTS

2.1 GOVERNMENT FURNISHED MATERIALS

A. See Section 01019, Government-Furnished Property if applicable.

2.2 CONTRACTOR-FURNISHED MATERIALS

A. Bentonite: Granular bentonite shall be American Colloid KWK, CS/55 or approved equal.

Pellet bentonite shall be American Colloid Vol-Clay or approved equal.

B. Well cap or sanitary well seal designed to prevent pollutants from entering the well.

C. Disinfectant: Calcium hypochlorite (65% available chlorine) or alternative as approved by the Contracting Officer.

WY-02670 - 2

D. Sample Bags: Sample bags or other containers as approved by the Contracting Officer.

PART 3: EXECUTION

3.1 WELL LOG AND SAMPLES:

A. Well Log: The Contractor will record drilling and logging information in the format and/or on the forms agreed to at the pre-work conference. The Contractor maintained well log shall meet the state requirements and include entries for the formation and each apparent change in material penetrated, or every 10 feet, whichever is lesser. The log of the well shall show material penetrated and full descriptive notes made of each stratum found by the drill and difficulties or any usual conditions met in drilling. Water-bearing strata shall be described in detail as to loose or compact material, color, and if gravel, whether it is water-worn or angular. The presence of clay shall be noted. The log must be kept up to date with the progress of the well drilling and shall be available for inspection by the Contracting Officer during drilling operations and after completion of drilling.

B. Logging: The Contractor shall collect samples of well-cuttings at ten-foot intervals or at each formation change (whichever is less) and, as per the Contracting Officers instructions, place them in an orderly fashion on the ground near the drill site where they can be reviewed throughout the drilling process or placed in sample bags. The sample bags shall be marked showing the depth at which the samples were collected and the date and time that the samples were collected.

C. Information for State filing: The Contractor shall furnish the Contracting Officer with a copy of the drilling information (including the log and geophysical logs) required by the State Engineer’s Office for filing on water wells.

3.2 ABANDONMENT OF THE WELL:

A. Abandonment Due to Contractor’s Actions: When the drilled well must be abandoned because of actions of the Contractor, including but not limited to lost tools, damaged well, misalignment, inability to properly install casing string and/or gravel pack, or other causes attributed to carelessness or poor workmanship, the Contractor shall pull casing (if installed) that can be removed. If the casing cannot be pulled, cut the casing off three feet below grade. The contractor will then plug the hole in accordance with State regulations and requirements. The order to abandon the well must be in writing from the Contracting Officer. The abandonment must be witnessed by the Contracting Officer. The Contractor

WY-02670 - 3

shall be responsible for drilling a new well within 50 feet of the original well.

B. Abandonment Due to Other Causes: When the well must be abandoned because of inadequate quantity or quality of the water, or for another reason not the fault of the Contractor, the Contractor shall pull the casing (if installed) that can be removed. If the casing cannot be pulled, cut the casing off three feet below grade. The contractor will then plug the hole in accordance with State regulations and requirements. The order to abandon the well must be in writing from the Contracting Officer. The abandonment must be witnessed by the Contracting Officer.

3.3 SANITARY PROTECTION OF WELLS:

A. General: The Contractor shall protect the well during the construction and testing period to prevent tampering or seepage of contaminated water, petroleum products, or other contaminates into the well from the ground surface.

B. Seal: When the well is completed, install a cap or sanitary well seal designed to prevent pollutants from entering the well. Seal or screen off equipment openings that permit direct access to the well to prevent entrance of foreign matter or contaminates.

C. Grading: Slope the surface immediately surrounding the top of the well casing wellhead away from the well in all directions.

D. Correcting Contamination: If the well becomes contaminated, or water with undesirable physical or chemical characteristics enter the well due to the neglect of the Contractor, corrective work including the supplying of casing, seals, sterilizing agents, or other materials as may be necessary to prevent contamination of the aquifers shall be performed at the Contractor's expense.

3.4 DISINFECTION

A. General: All disinfection shall be done in the presence of the Contracting Officer.

Disinfection (both following drilling and following pump installation) shall be done in compliance with the State of Wyoming Water Well Minimum Construction Standards.

PART 4: MEASUREMENT AND PAYMENT

4.1 METHOD OF MEASUREMENT:

WY-02670 - 4

A. General:

1. Rig or Standby time will not be paid for.

2. No payment will be made for drilling, installing casing, removing casing, or the plugging of a well abandoned due to Contractor's actions.

3. No payment will be made for record keeping, disinfection of the well, or furnishing and installing the cap or compression seal. The Contractor shall include consideration for these items in the bid price for other items of the Contract.

B. Units:

1. Payment will be made for furnishing and installing materials for the quantity abandoned due to causes not the fault of the contractor. Pulling casing and plugging the hole when the well is abandoned due to causes not the fault of the Contractor will be based on the price negotiated by the Contracting Officer.

2. Mobilization to the job site and between locations will be measured and paid for as a lump sum.

4.2 BASIS OF PAYMENT:

A. Payment: Prices and payment will be full compensation for the work described in this section. Payment will be made under:

Pay Item Pay Unit

WY-02670 (1) Mobilization .....................................................................................Lump Sum

END OF SECTION