ATTACHMENT 2 - Statement of Work 12467020R0006.docx

12467020R0006

BUCKHALL WELL CONSTRUCTION

ATTACHMENT 2 – STATEMENT OF WORK

USDA FOREST SERVICE

BUCKHALL RECREATION AREA

WATER WELL CONSTRUCTION AND ABANDONMENT

12467020R0006

October 2019

US Forest Service 4931 Broad River Road Columbia, SC 29212

BUCKHALL RECREATION AREA

WATER SYSTEM AND PLUMBING RENOVATIONS

DIVISION 1 - GENERAL REQUIREMENTS

01010 - SUMMARY OF WORK

A. In accordance with the contract provisions, the contractor is to provide the complete construction of the Buck Hall Recreation Area Water Well Construction in accordance with SC DHEC permit 33839-WS, and the specifications and other provisions of the contract. Work shall include but not be limited to the following:

1. Construct complete domestic water well in accordance with SC DHEC permit 33839-WS Contractor shall connect new well to water system piping in the pumphouse via underground schedule 80 PVC water line and electrical service in accordance with the drawings.

2. Abandon existing adjacent well in accordance with SC DHEC permit 33839-WS.

Well is 4” diameter steel casing, and records show it is approximately 100+ feet deep. This well is inside a pumphouse with concrete slab floor. After abandonment of well, concrete floor shall be restored to a smooth, flat concrete surface. If roof components are removed for casing extraction, contractor shall restore roofing to present, leak-free condition.

3. Complete all required SC DHEC water quality testing required to obtain a SC DHEC permit to operate

B. Any permit-required activities requiring observation, consultation, coordination, approval, or reporting by the professional design engineer, shall be coordinated with TY Lin International; Forest McKenzie, PE; phone: 843-806-4120.

C. This work shall be completed with minimal impact to campground operation and the present in-use water system. Contractor shall notify campground host or Forest Service Recreation managers for temporary system shut downs lasting up to several hours. Shut downs lasting more than 8 hours shall be coordinated through the COR. Present drinking water system permit: SC Department of Health and Environmental Control number 25738-WS.

D. Provide the COR a written plan showing dates of planned contract activities prior to mobilization and at least 3 days prior to construction start.

01040 – COORDINATION

A. The recreation area is open and the campground is expected to be open during construction. The contractor shall provide all signs, barricades, and notices necessary to inform and protect the public during construction operations.

B. This work must be done in compliance with SC Department of Health and Environmental Control (DHEC) drinking water standards and system permit number 25738-WS. Modifications to the permitted drinking water system must be approved by SC DHEC.

01051 – CONSTRUCTION STAKING

A. Construction staking shall be the responsibility of the Contractor. Staking for any part of the work shall be approved by the COR prior to commencing construction on that part. Construction staking shall not be a separate pay item, but shall be considered part of each individual item of work.

01300 – SUBMITTALS

A. Contractor shall submit to the COR, data sheets and/or drawings for all "or equal" substitutions proposed in lieu of the name brands specified prior to commencing any work that relates to a respective submittal. Contractor may submit electronic copies of submittals to the COR.

B. Contractor shall submit 3 copies of all submittals as specified in other sections of these specifications.

01410 - TESTING LABORATORY SERVICES

A. The Contractor shall complete all water sampling and testing necessary to obtain a SC DHEC water system Permit to Operate. Notify SC DHEC or the design engineer for permit-required inspections, as applicable.

01510 - TEMPORARY UTILITIES AND LOCATION OF EXISTING UTILITIES

A. Electricity – 120 volt power is available at the site.

B. Water -Potable water (drinking water) is not available at the site.

C. Sanitary - Sanitary facilities (portable) are available at the site.

D. Contractor shall locate all underground utilities (power, water) prior to trenching or excavating. Utilities that are damaged or cut during construction shall be repaired by the contractor.

01635 - PROTECTION OF ADJACENT AREAS

A. The Contractor shall be responsible for protecting from damage all adjacent areas and existing improvements around or near the project site. All damage to areas caused by construction activities or equipment shall be immediately reported to the COR. The Contractor shall be responsible for repairing all damaged areas as directed by the COR.

01700 - PROJECT CLOSEOUT

A. Instructing Owner in Use of water system/well

It is the responsibility of the Contractor to see that the proper manufacturer's representatives, subcontractors, contractor's superintendents, etc., are available at completion of the job and before occupancy to provide instructions in the use of all facilities and equipment and to train personnel in the proper use and maintenance of the building, equipment controls, switches, valves, etc.

DIVISION 2 - SITE WORK

SECTION 02050

DEMOLITION

PART 1 - GENERAL

A. This item covers the removal/abandonment of the existing well. Follow SC DHEC regulations for well abandonment.

PART 2 - PRODUCTS

A. None.

PART 3 - EXECUTION

A. All material designated to be removed shall be removed from the project site and disposed of in accordance with all state regulations.

B. Concrete slab portion in the pumphouse shall be saw cut to form a clean straight edge for anticipated removal of upper well casing for abandonment.

C. All holes shall be backfilled and compacted in 6 inch lifts to the density of adjacent ground.

SECTION 02221

TRENCH EXCAVATION, BACKFILL, AND COMPACTION

A. This item covers all trenching, backfilling and compacting.

B. All excavation work shall be unclassified.

C. A buried utilities shall be in compliance with local/county building codes, and International Code Council (ICC) codes.

A. None.

A. The trenches receiving the pipe shall be the minimum width possible with consideration being given to working room and safety within the trench.

B. The depth of the trench shall be as necessary to remove and replace the waterlines as specified.

C. The trench bottom shall be raked smooth and compacted to form proper bed for pipe and prevent settlement at the bottom of the trench.

D. Pumping, Bailing and Draining

1. The Contractor shall remove by pumping, bailing, or draining any water which may accumulate, or be found, in the trenches and other excavation made under this contract and shall form all dams, flumes or other works necessary to keep them entirely clear of water while the utility lines are being constructed.

E. Trench Backfilling and Compaction

1. Trench backfilling shall be carefully performed so as not to cause movement of the pipe within the trench.

2. Backfill shall be carefully deposited and compacted on both sides of the pipe to avoid damaging pipe.

3. Warning tape shall be installed in all trenches.

DIVISION 3 - CONCRETE

SECTION 03100

CONCRETE FORMWORK

A. This section covers all formwork, expansion and control joints, and related accessories.

A. Forms shall be wood, plywood, hardboard, or metal and shall be approved by COR.

B. Form oil shall be nonstaining type.

C. Expansion joint filler shall be premolded or preshaped type made of asphalt fiber.

A. Forms shall be built tight, in proper alignment, and adequate to resist the stresses of concrete placement without deformation.

B. Forms shall be constructed to produce the required concrete surface.

C. Expansion and contraction joints shall be formed as indicated on the drawings.

SECTION 03200

CONCRETE REINFORCEMENT

PART 1 – GENERAL – Reinforcement of concrete is not expected in this contract.

A. This section covers all concrete reinforcement and its accessories.

B. The latest editions of the following specifications and codes shall govern:

1. ACI 301, Specifications for Structural Concrete for Buildings

2. ASTM A615, Deformed and Plain Billet-Steel Bars for Concrete Reinforcement

3. ASTM A185, Steel Welded Wire, Fabric, Plain, for Concrete Reinforcement

A. Reinforcing steel shall comply with ASTM A615, intermediate grade 40, unless otherwise shown.

B. Reinforcing mesh shall comply with ASTM A185 and shall be gauge and mesh indicated.

A. Reinforcement bars and mesh shall conform to the sizes and spacing as shown.

B. Field bending and cutting will be permitted if performed in accordance with above listed code.

C. Reinforcement shall be free from dirt, oil, paint, grease, mill scale, and loose or thick rust when concrete is placed.

D. Woven wire mesh shall be hooked and/or supported during the placement of concrete slabs to insure proper embedment as detailed.

E. Anchorage and accessories shall be accurately placed as shown and held rigidly in position during placing of concrete.

F. Depth of cover, radius of bends, and deformations shall be in accordance with ACI-318.

G. All splices shall overlap a minimum of 18 inches.

SECTION 03300

CAST-IN-PLACE CONCRETE

A. This section covers cast-in-place concrete, including curing and finishing of concrete.

B. The latest editions of the following specifications and recommended practiced shall govern:

1. ACI 301 - Specifications for Structural Concrete for Buildings

2. ACI 306 - Recommended Practice for Winter Concrete

3. ACI 305 - Recommended Practice for Hot Weather Concrete

A. Aggregate shall conform to the requirements of AASHTO M6 and M80 and shall be well graded from fine to coarse within designated limits.

B. Cement, Portland, shall comply with ASTM C150, Type 1. Supplier shall provide mill certification of compliance with specification.

C. Water shall be clean, fresh, and free from injurious amounts of minerals or foreign substances.

D. Additives, air entrainment agents shall comply with ASTM C-260.

E. Liquid curing membrane shall be Type 1-D or Type 2.

F. Concrete Mix Design

1. All concrete shall have a minimum "compressive strength" of 3000 psi at 28 days.

2. Concrete shall be air entrained and shall contain not less than 3% and not more than 6% entrained air determined by test procedure ASTM C-138.

3. The design of the concrete mixture shall be the responsibility of the Contractor and shall be submitted to the COR for approval prior to placing any concrete.

G. Concrete collars for valve boxes shall be pre-fab concrete collars as approved by the COR.

A. "Ready-Mixed Concrete" may be employed if the time interval between mixing at the plant and discharge into the form does not exceed 1-1/2 hours.

B. All concrete shall be placed within 1-1/2 hours from the time of mixing.

1. No concrete shall be placed after it has started its initial set.

2. No concrete with a temperature above 90oF or below 50o shall be placed.

C. Concrete shall be placed in such a manner as to avoid segregation of the mixture.

1. Concrete shall be spread in horizontal layers when practicable.

2. No concrete shall be freely dropped more than 5'.

3. Depositing a large quantity of concrete and flowing or working it along the forms will not be permitted.

D. Mechanical vibrators shall be used for consolidation of concrete.

1. Concrete shall be consolidated within 15 minutes after placement.

2. If consolidation of concrete with mechanical vibrators is impractical, hand tamping, rodding, and spading will be permitted.

E. Concrete shall be placed and protected as specified for temperature conditions.

F. Concrete plant standards and truck mixer and agitator standards shall be as recommended by the National Ready Mix Association.

G. Finishing

1. All finishes shall be made without use of cement or other dusting materials.

2. Concrete shall be struck to proper grade and surface finished with float trowels.

3. At all exposed formed surfaces, remove all ties, fill all form tie holes and imperfections; i.e., "honeycombing", with dry cement mortar, remove all lines, and then "sack" or finish to match adjacent surfaces.

4. The concrete pad surface shall be broom finished.

5. All edges and control joints, shall be edged with a minimum 1/2 inch radius edging tool

H. Concrete shall be protected against rapid drying and kept moist for 7 days by covering with curing paper with edges sealed, burlap, canvas, Type 1-D or Type 2 liquid membrane curing compounds, or by sprinkling.

I. Testing – testing is not required for the concrete slab patch under this contract.

1. Concrete shall have a minimum 28-day breaking strength of 3000 psi when tested in accordance with ASTM C-39.

2. At the option of the COR, the Contractor shall make a minimum of two (2) test cylinders from each concrete truck. The test cylinders shall be made in accordance with ASTM C31, stored on the site, and protected from damage. Each cylinder shall be labeled to identify which section of the project the concrete was incorporated. The Contractor shall deliver the cylinders to a Forest Service approved laboratory for testing. The cost of testing (breaking) the cylinders will be paid for by the Contractor.

3. Slump shall not exceed 3" for vibrated concrete or 5" for nonvibrated concrete. Contractor shall perform slump testing in accordance with ASTM C143 as may be directed by the COR.

DIVISION 15 - MECHANICAL AND PLUMBING

SECTION 15401

WATER SUPPLY LINE

A. This section covers the construction of the potable water supply lines from the well to present water system in the pumphouse, including all piping specialties, equipment, valves and boxes, yard hydrants, testing and disinfecting.

A. Water Pipe and Fittings

1. Plastic waterline shall be schedule 80 and in accordance with the permit.

2. Solvent for PVC shall be in accordance with pipe manufacturer's recommendations.

B. Concrete – Where concrete is used for slabs or bases, it shall conform to Division 3 of these specifications.

PART 3 - EXECUTION

A. Water Pipe and Fittings

1. Any connections made between different pipe materials, including valves and fittings shall be made using connectors or adapters designed for that purpose.

2. Adaptors between steel and plastic lines shall be made with standard adaptors specifically made for the purpose.

B. Pipe Laying Trench

1. Before the pipe is laid in the trench, the earth forming the bed shall be freed of stones, roots, etc. The pipe shall then be evenly bedded in the earth to leave a uniform support for the entire length of the pipe, except the couplings under which a recess shall be excavated to a sufficient depth to relieve it of any load and to allow ample space for making the joint. In case the bed trimmed on the bottom of the trench is too low, earth shall be placed in the bottom of the trench and tamped, and a new bed shall be trimmed for the pipe. Pipe shall not be raised by ramming earth beneath it.

2. All water lines shall be provided with a minimum of thirty (30) inches of cover.

3. Preparatory to making pipe joints, all surfaces of portions of the pipe and jointing material to be joined shall be clean and dry. Lubricants, primers, adhesives, etc., shall be used as recommended by the pipe and/or joint manufacturer's specifications. The joints shall be made and a watertight joint obtained.

4. When the pipe has been bedded and the joint made, the recess under the couplings shall be refilled with earth and enough refilled and tamped on each side of the pipe to hold it securely in place. Care shall be taken to not disturb the position of the pipe during this process.

5. Backfill shall not be placed over any pipe that is in a heated condition. Before backfilling, the pipe temperature shall be brought to the approximate temperature of the ground either by running water through it or by backfilling in the early morning when pipe and ground are at the same temperature.

6. A continuous and uniform bedding shall be provided in the trench for all buried pipe. Back-fill material shall be tamped in layers around the pipe and to a sufficient height above the pipe to adequately support and protect the pipe. Stones, other than crushed bedding, shall not come into contact with the pipe and shall not be within six (6) inches of the pipe.

7. Trenches shall be kept free and dry during bedding, laying, jointing, and backfilling.

8. At the end of each work day and when left unattended, all open ends of the pipes will be covered to prevent entrance of trash or wildlife.

9. Connections will be made to the existing and/or constructed facilities according to standard plumbing practices. Any connections made between different pipe material shall be made using connectors or adaptors designed for the purpose of connecting the two types of pipe.

10. Extend handles on all underground valves as shown on the drawings. If handles can not be extended as shown, provide wrench and handle for each valve.

11. Drain-fields and Spray-fields - Potable water lines shall not be laid less than twenty-five (25) feet horizontally from any portion of a waste-water tile-field or spray-field.

12. Install detectable warning tape in all water line trenches as shown the drawings. Water line shall be detectable within 3 feet with electronic equipment.

13. Bore or jack all waterlines under all pavements. Maintain 30” minimum bury depth for waterlines. Steel sleeve or casing may be used under pavements subject to the approval of the COR.

C. Separation of Water Mains and Sewer – Not used

D. Testing

1. Waterlines - Before backfilling any section over pipe couplings, it shall be tested by the Contractor in accordance with AWWA C600. Test pressure shall be a minimum of 90 PSI (1.5 times the working pressure) for two hours with no allowable leakage. An air pressure test will not be accepted. The Contractor shall record all test procedures and results and submit two (2) copies to the COR upon completion of all pressure testing.

2. Leaks or defects revealed by the tests will be located and repaired until no leaks are detected and the pressure holds for two hours. Any length of pipe or pipe fitting damaged or defective shall be promptly removed from the job site or destroyed.

2. Test System for Proper Operation in the Presence of the COR.

E. Disinfection of Waterlines – This section kept for reference- follow all SC DHEC requirements per permit.

Prior to disinfecting water lines, contractor shall post signs at each toilet building informing the public not to drink the water. All hydrants and drinking fountains shall be turned off at the underground valve during disinfecting operations.

1. Disinfection of waterlines shall be conducted in accordance with AWWA C651. Upon completion of the water system, the entire system shall be disinfected by pumping chlorine at 50 ppm throughout the entire system. Valves, faucets, fixtures, and hydrants shall be opened at this time permitting the solution to flow through until the strong smell of chlorine is detected and then closed. This chlorinated water shall remain in the system for a minimum of 24 hours. At the end of the 24 hour disinfection period, the treated water in all portions of the waterlines must have a residual of not less than 10 ppm free chlorine. Then the system must be flushed with potable water and the sampling program started. Care must be exercised to prevent damage to the equipment or surrounding environment when draining the system.

2. SC DHEC will conduct sampling per their direction. (This section left for reference) The number of sampling sites depends on the amount of new construction but must include all dead-end lines and be representative of the water in the newly constructed mains. At each site, a minimum of two (2) satisfactory bacteriological samples taken at least 24 hours apart shall be obtained. Also at each site, chlorine residual at time of sampling must be measured and reported. If the membrane filter method of coliform analysis is used, non-coliform growth must also be reported. If non-coliform growth is greater than 80 colonies per 100 milliliters, the sample result is invalid and must be repeated. All samples shall be analyzed by a State approved laboratory.

3. Location and number of bacteriological samples and chlorine residual tests required are as follows: (SC DHEC will conduct final sampling per their direction)

3. If the chlorine residual at each site is greater than 0.0 mg/l, then the bacti and chlorine residual tests shall be repeated at that site.

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