specs.doc

CONSTRUCTION SPECIFICATIONS

FOR

CRESCENT MOON RANCH – NEW WELL

SECTION 100 – GENERAL REQUIREMENTS

100.01 – PURPOSE

The well drilling work to be performed under these specifications will be used to drill an additional potable water supply well for the existing Crescent Moon Ranch Recreation Area. The desired end result is a production of approximately 10 - 20 gallons per minute (gpm) of potable water from the aquifer during preliminary testing and the preparation of a complete set of detailed Driller’s logs. It is anticipated that a well capable of producing the desired yield will need to be approximately 1,100 to 1,200 feet deep at the proposed well location. Well will be constructed, developed, and tested in accordance with these specifications.

100.02 – LOCATION

The Crescent Moon Ranch Recreation Area proposed well site is located in West Sedona, Arizona. It can be reached by going west on Highway 89A towards Cottonwood, turn south on Upper Red Rock Loop Road, go 1.8 miles and turn left onto Chavez Ranch Road, go 0.2 mile and turn slightly left onto Chavez Ranch road (unpaved), go 1.0 mile and go through gate.

The site is located on the Red Rock Ranger District of the Coconino National Forest in the SW ¼, SW ¼, NE ¼ of Section 26, Township 17 N, Range 5 E of the Gila and Salt River Meridian, Yavapai County, Arizona.

100.03 – WELL SITE

The proposed well site is located at the northern central area of the Crescent Moon Ranch Recreational Area on a higher terrace above the actual recreational picnic area (see attached location maps). The proposed well site location is approximately 150 feet west from an existing well situated along with other various surrounding buildings. The elevation of the site is 4,000’, and the terrain at the well site is generally flat.

This area is not open to the general public, but there is a residence on the Forest Service’s cabin rental program, which may be occupied. There are generally 2 – 3 camp hosts that occupy this hilltop area and reside in their recreational vehicles approximately 130 feet from the existing well site.

The geologic formation that underlies this site, and which this well will have to penetrate, is the Supai Formation. The Supai Formation is Pennsylvanian and Permian in age, and consists of red beds of sandstone, siltstone, and mudstone, with some limestone, breccia and conglomerate. The formation is described to consist of an upper, middle, and lower member. Most wells obtain their water from the middle and lower members.

We have information of an existing well as mentioned before and will attach its well drilling log. The geologic formation should be similar since the new well will be drilled approximately 150 feet from the existing well. From 0” – 4’ there is hard soil and cobbles, and 4’ to 815’ is Supai Mudstone and Siltstone, and 815’ to 940’ is Redwall Limestone. Final depth of this new well is expected to be at 1,100 – 1,200 feet in the Redwall Limestone.

The field-staked location of the well site shall be furnished to the Contractor by the Contracting Officer’s Representative (COR) prior to the commencement of drilling operations. The Contractor shall notify the Contracting Officer at least 48 hours in advance of moving to the site. The Contractor shall not move his/her drilling rig or equipment away from the well site until so directed by the COR.

100.04 – SCOPE OF WORK

The Contractor shall furnish all plant, labor, materials, transportation, services, and equipment and perform all work of drilling, constructing, and testing wells in conformance with these specifications and any applicable drawings.

The major items of work include drilling a bore hole, which shall be large enough in diameter to accommodate 12-inch nominal diameter steel well surface casing; installing 6-inch well casing; installation of gravel filter pack, developing well; test pumping; installing submersible pump with all the electrical. In addition, the Contractor shall determine the character of the subsurface formations, static water level, and hydraulic characteristics of the aquifer formation to be utilized. The Driller shall keep current written notes of these items which will form the basis of the Driller’s logs. These Driller’s logs shall be made available to the Government during drilling operations, and copies shall be provided to the Government as drilling proceeds.

The Contractor shall use steel blank and shutter screen (louvered) casing in accordance with the maximum depth and casing requirements of these Specifications. Due to the history of the existing well, this well shall be designed to have a gravel filter pack envelope approximately 3” thick to minimize the fine sediment.

In the event that no adequate water supply is found, the Contractor shall abandon the well drilling in accordance with these specifications and State of Arizona regulations.

100.05 – CONTRACT TIME

All work under this contract shall be completed within 60 calendar days after the date of receipt of the Notice to Proceed.

100.06 – SUBMITTALS

For the items listed below, the Contractor shall furnish manufacturer’s information submittals to the COR before material installation will be permitted.

· Surface Casing

· Production Casing

· Shutter/Louvered Casing

· Well Screen

· Gravel Filter Pack or Artificial Filter

· Grout

· Drilling Fluid and any Additives

Submersible Pump Pitless Adapter

A submittal of the Contractor’s Schedule of Tasks shall be submitted as completed in the process of completing the well. Included are personnel, scheduling of tasks (drilling, casing, screen, gravel pack installation, development).

100.07 – PRECAUTIONARY MEASURES

The Contractor shall take precautions to protect the public and all work during the construction period and shall provide and maintain adequate protection during severe weather conditions to prevent damage to the work, materials, and notes or log books. The safety measures shall include all necessary protective barriers, proper posting of warning signs and/or signals, and adequate lighting. A secure cap shall be installed on the well upon well completion and during periods of construction inactivity.

Due to the proximity and sensitive nature of the immediate area of the residents and close proximity to the lower area of the recreational sites of Crescent Moon, it is imperative that all drilling fluids and cuttings be confined to the area immediately adjacent to the well site. In order to accomplish this, the Contractor shall utilize portable containment basins/tanks or shall construct an adequately sized pit adjacent to the bore hole to receive all drilling fluids and cuttings. Runoff onto the land surface outside of the immediate drilling area or into any surface waters or drainages, including the nearby recreational and residential areas, shall not be permitted. Upon completion of the well, the Contractor shall backfill the pit to original grade.

100.08 – UTILITY SERVICES, WORK CAMP, STORAGE AREA, AND TIMES OF OPERATION

1. Water Service - There is water service available for use at the job site.

2. Electrical Service – There is electrical service available for use at the job site. Contractor may need to set up a temporary panel and receptacles for construction use only and shall be removed at end of contract.

3. Access to Site – There is a gated area from the North side of the Recreational Area which may be utilized for all entries into the project site especially for large equipment. The public access into the recreational area has limited widths and will not be sufficient for large size equipment.

4. Work Camp – No work camp shall be established within the Crescent Moon Ranch Recreational Area. The city of Sedona is nearby and has available lodging.

5. Storage Area – The Contractor may utilize an area the COR will provide which will be near the proposed well site. Temporary storage of materials, such as well casing, at the job site may be done with the approval of the COR, but this shall be at the Contractor’s risk.

6. Times of Operation – The times of drilling/construction operations at this site shall be acceptable from 7:00 am to 7:00 pm. seven days per week. No motorized activities may occur before 7:00 a.m. or after 7 p.m. seven days per week

END OF SECTION 100

SECTION 200 – WATER WELLS

200.01 – STATE DRILLING PERMIT

The driller shall be licensed in the State of Arizona for drilling potable water wells.

The Contractor will supply the Government, at the time of contract award, a State drilling permit form with the necessary Owner’s information filled in. The Government will then complete the necessary portions of this form and return it to the Contractor for submittal to the State. The Contractor shall complete this form and submit application for drilling permits and pay all permit fees as required by the State of Arizona. Preparation of completion reports or other forms required by the State agencies shall be the Contractor’s responsibility. Except where these specifications are more stringent, all aspects of the drilling of the well, including abandonment if required, shall comply with applicable State codes.

200.02 – BORE HOLE DRILLING

1. General

The bore hole shall be of a sufficient diameter to accommodate 12-inch nominal diameter surface well casing and a 6-inch well casing with 3-inch gravel pack. The bore hole shall be drilled plumb and straight and drilling shall be conducted on a regular basis until a depth that produces the desired water yield is reached. The Contractor shall notify the COR of any intended periods of inactivity. Periods of inactivity in excess of two days during well drilling operations shall not be allowed unless authorized by the COR.

If drilling fluid is required, as when using rotary drilling equipment, it shall be polymer based and shall not contain any material detrimental to the aquifer (cement, oil, etc.). No bentonite or natural clay-based fluids may be used. All additives and fluids shall be approved by the COR prior to use. During the drilling operation, formation cuttings and drilling fluids shall be confined to portable basins/tanks or excavated pits to minimize environmental damage. There will be an area adjacent to the proposed well site to be utilized for the containment area.

Drill cuttings, any drilling fluids, and all material bailed from the well bores shall be contained in suitable portable basins/tanks or in an adequately sized excavated pit adjacent to the well site. Whether portable basins/tanks or an excavated pit is used, the capacity shall be sufficient to contain all drilling fluids, cuttings, and bailed material. The Contractor shall install or construct the containment area at a location approved by the COR. No runoff of drilling fluids shall be allowed. Any excavated pits shall be backfilled with the excavated material and leveled to the original grade upon well completion.

2. Surface Casing Install surface casing as necessary to seal off any incompetent soil, alluvium, bedrock material, and shallow or contaminated groundwater to a minimum depth of 20 feet or deeper as directed by the COR. New steel surface casing having a minimum wall thickness of 3/16-inch shall be installed from the depth specified to two (2) feet above the ground surface. Surface casing shall have a nominal diameter at least six (6) inches larger than the production casing. Provide and install a bolt-on well cap over the surface casing during any periods of inactivity at the site.

3. Logs of Bore Hole The Contractor shall maintain and furnish to the COR work activity, casing tally, and Driller’s logs of the bore hole or well as the drilling proceeds. Location of strata, their thicknesses, the nature of the formations encountered, and descriptions of any groundwater encountered shall be recorded. All logs shall be kept current during the day and be available for inspection. Clear and legible copies shall be delivered to the COR within two working days for the preceding week’s work.

4. Formation Sampling of Groundwater Production Zone

Samples of drill cuttings shall be obtained during drilling operations for the purpose of designing the gravel pack gradation, and the well screen slot size in the groundwater production zone of the well. Samples shall be handled and preserved in suitably marked appropriate containers. Two representative samples shall be taken, collected, and marked by the Contractor for each formation encountered, including the aquifer formation. Submit the samples to an approved laboratory to obtain a sieve analysis. Deliver the sieve analysis result to a screen manufacturer to provide the data upon which screen-slot size and gravel-pack size distribution will be recommended.

5. Water Bearing Strata The bore hole shall be drilled to a maximum depth of 1,200 feet, or to the depth directed by the COR. The Contractor shall notify the COR two days prior to his/her estimated time of reaching the anticipated total depth of the bore hole. The COR reserves the right to terminate the drilling above the base of the aquifer formation.

6. Well Blockage

In the event a tool is lost in the well bore and is not recoverable, or other blockage occurs that prevents continuing the hole to the depth specified in the Schedule of Items, the following action shall be taken: If a depth is reached that produces the yield as specified in Paragraph 100.01 and drilling cannot be continued due to hole blockage, then the hole will be accepted if all other specifications are met. But if a well does not produce the specified yield at less than the specified depth, then the Contractor shall abandon the hole as specified below, relocate the drill rig to another setup point approved by the COR, and drill a suitable hole at no additional cost to the Government.

7. Abandonment of Bore Hole or Well

The COR may order the bore hole or well to be abandoned at any time should results indicate that there is insufficient water or that water is of unsatisfactory quality. An abandoned uncased hole shall be backfilled with clean drill cuttings and/or grout and have a concrete surface plug installed to a depth of five (5) feet, depending on the geologic conditions and/or State requirements. If casing is already installed as authorized by the COR, either pull the casing and follow the directions for an uncased hole as previously described, or if the casing cannot be pulled, abandon the well per State regulations. Abandoned casing shall be removed at least five (5) feet below the natural ground surface and the hole shall be filled in level with the ground surface. In either case, the abandoned hole shall be marked so that the exact site can be easily located.

200.03 – COMPLETION OF WELL

After completion of bore hole drilling and testing, and with approval from the COR, the Contractor shall continue with the completion of the well. This shall include the installation of the production (solid) well casing, shutter/louvered type well casing with a nominal diameter of six (6) inches. The general sequence of well completion requirements is listed below. This sequence is not intended to restrict the Contractor in performing any necessary work.

1. Natural Development Cable Tool Drilling Procedure

Install blank production casing to the depth required to seal off undesirable aquifer zones.

Subject alluvial formation samples to sieve analysis for proper shutter/louver slot size casing and gravel filter pack. This result shall be submitted to shutter/louvered casing manufacturer for mechanical analysis. Install the shutter/louvered casing through aquifer zone. Contractor shall furnish and install all proper seals for the installation of the gravel filter pack, including gravel feed pipe.

After entire casing installation, including the shutter/louvered casing and gravel filter pack, develop the well for production capacity and disinfect the well. Remove temporary surface casing while installing sanitary well seal.

2. Natural Development Rotary Drilling Procedure Subject hole alluvial formation samples to sieve analysis for proper shutter/louver screen slot size for casing and gravel filter pack gradation. This result shall be submitted to shutter/louvered casing manufacturer for mechanical analysis. Contractor shall furnish and install all proper seals for the installation of the gravel filter pack, including gravel feed pipe.

Ream well bore hole, if necessary, to the depth required and install blank production casing.

Ream test hole, if necessary, below production casing setting, through aquifer zone, and install shutter/louvered casing through aquifer zone, and install gravel filter pack and all filter pack seals.

Develop and test the well for production capability and disinfect the installation. Remove temporary surface casing while installing sanitary well seal.

200.04 – CASING AND WELL SCREEN

1. Steel Casing: The blank production casing shall have the following characteristics:

A. Material: New, steel conforming to ASTM A-139, Grade B, "Electric Fusion Welded Steel Pipe”, as manufactured by the Roscoe Moss Company, or approved equal. All material, including casing sections, shall be supplied from a single source. Material shall be either of the following two types shown below:

1. Mild Steel

2. Copper-bearing

B. Minimum Wall Thickness: 3/16-inch minimum

C. Length: Nominal 21 foot lengths.

D. Joints: Joints shall be electric arc welded. Full penetration butt welded casing joints shall be required. The use of a casing alignment tool is required for welded joints.

E. Field Assembly: For field assembly by welding, section ends shall be furnished with collars.

F. Collars: Shall have the same thickness and have the same physical and chemical properties as the corresponding casing section. Collars must be rolled to fit the outside diameter and factory welded to one end of each section. The inside edge of the collars shall be free of sharp edges and burrs. Section ends shall be machined flat perpendicular to the axis of the casing and shall not vary more than 0.010-inch at any point from a true plan at right angles to the axis of the casing.

G. Inspection Windows on Collars: Three 3/16-inch diameter inspection windows must be provided in each collar to assure proper matching of the sections.

2. Well Screen (Metal Construction): The shutter/louvered screen shall have the following characteristics:

A. Type: Shutter / Louvered Screen B. Material: New, steel conforming to ASTM A-139, Grade B, "Electric Fusion Welded Steel Pipe”, as manufactured by the Roscoe Moss Company, or approved equal. All casing sections, including blank casing, shall be supplied from a single source. Material shall be either of the following two types shown below:

1. Mild Steel

2. Copper-bearing

Louvered screen casing slot size shall be sized according to sieve analysis. The Contractor shall submit results to a steel manufacturer, such as Roscoe Moss Company, or approved equal. The sieve analysis will determine the gravel pack gradation and the slot size of the louvers.

C. Strength: Adequate to withstand the external forces to which it will be subjected during and after installation.

D. Joints: Joints shall be electric arc welded. Full penetration butt welded casing joints shall be required. The use of a casing alignment tool is required for welded joints.

E. Field Assembly: For field assembly by welding, section ends shall be furnished with collars.

F. Collars: Shall have the same thickness and have the same physical and chemical properties as the corresponding casing section. Collars must be rolled to fit the outside diameter and factory welded to one end of each section. The inside edge of the collars shall be free of sharp edges and burrs. Section ends shall be machined flat perpendicular to the axis of the casing and shall not vary more than 0.010-inch at any point from a true plan at right angles to the axis of the casing.

G. Inspection Windows on Collars: Three 3/16-inch diameter inspection windows must be provided in each collar to assure proper matching of the sections.

H. Openings: Submit samples of drill cuttings from the aquifer formation for mechanical analysis. Screen openings shall be machine made, horizontal to the axis of the casing and of a louver form with the aperture facing downward. The aperture size, amount of openings per lineal foot, and the minimum area of opening shall be determined by the sieve analysis.

I. Length: To be determined from the Driller’s log and mechanical analysis of the formation samples.

J. Size: 6-inch nominal pipe size, 3/16-inch wall thickness minimum.

3. Surface Casing Surface casing shall be new steel having a minimum wall thickness of 3/16-inch. Surface casing shall have a nominal diameter at least six (6) inches larger than the production casing.

200.05 – SANITARY SURFACE SEAL

The annular space between the drill hole and the surface casing shall be sealed with cement/sand grout. The depth of the grout seal shall be a minimum of 20 feet or to a depth adequate to prevent entry of undesirable subsurface water.

Insert a packer ring around the production casing at the proper depth below ground level. Remove the temporary surface casing while installing the grout. Grout may be installed by dumping and tamping or by the grout pipe method. Grout shall be brought to two (2) to three (3) feet below ground surface to allow for installation of a pitless adapter. A watertight seal or gasket shall be placed between the pump discharge head and the discharge line; or, in the event of a below-ground discharge, between the discharge pipe and discharge line.

Openings into the top of the well which are designed to provide access to the well, i.e., for measuring, chlorinating, adding gravel, etc., shall be protected against entrance of surface waters or foreign matter by installation of watertight caps or plugs. Access openings designed to permit the entrance or egress of air or gas (air or casing vents) shall terminate above the ground and above known flood levels and shall be protected against the entrance of foreign material by installation of down-turned and screened "U" bends.

Complete the well with fiber mesh reinforced concrete surface slab with minimum lateral dimensions of five (5) feet, 25-square feet, and a minimum thickness of four (4) inches, which is sloped to allow water to drain away from the well in all directions.

200.06 – GROUT

Grout shall be a sand-cement mixture of Portland cement (Type I, II, or III), sand, and water in the proportion of not more than two parts by weight of mortar sand to one part cement with not more than six (6) gallons of clean water per bag of cement or a neat cement mixture with not more than seven (7) gallons of clean water per bag of cement. Curing time before the resumption of construction shall be: Types I or II – 48 hours; Type III – 24 hours.

200.07 – STRAIGHTNESS

The well shall be constructed plumb and straight. A 30 foot long piece of pipe or other plummet device, whose outside diameter is no more than 1-inch smaller than the inside diameter of the casing, shall be used to test the straightness of the permanent well casing. The plummet device shall be put through all parts of the permanent casing. The well casing shall not vary from the vertical in excess of 2/3 the inside casing diameter per 100 feet of depth. The COR shall have the right to reject a well if it exceeds the plumbness requirement, or if the plummet device binds or does not pass freely through all parts of the casing, with no payment to the Contractor until such deficiency is corrected.

200.08 – DEVELOPMENT

After the gravel filter pack assembly, including the filter pack seal, has been installed, the well shall be developed by a mechanical method. The air lift swabbing technique shall be utilized, unless other methods are recommended by the well screen manufacturer and approved in writing by the COR. Continue well development until the water from the well is clear and free of fines. Start pumping at a low rate and gradually increase to the full well capacity. Continue pumping until no more fines can be brought into the well, or until ordered to stop by the COR.

200.09 – PUMPING

Wells shall be pumped continuously for one eight (8) hour period. No substitution for continuous pumping will be considered, and no stoppages or accrual of intermittent periods of pumping will be allowed in the payment for pumping unless so authorized by the COR.

The Contractor shall install the 5 hp submersible pump, pump cable, and all appurtenances necessary to permit the well to be pumped at the rate and depth specified and as agreed to by the COR. The Contractor shall also furnish a totalizing flow-meter or orifice weir and a gate valve for regulation and measurement of the discharge during the pumping tests. The Contractor shall also furnish a calibrated water level indicator or sounder, as approved by the COR, for measurement of the static and pumping water levels, and during the installation of the gravel filter pack and filter pack seals.

The Contractor shall notify the COR 48 hours in advance of the date when he/she proposes to start pumping. Prior to beginning the pumping, the Contractor shall discuss the details of the proposed pumping with the Government. The COR shall agree to the pump depth, pumping rates, and the general method in which the pumping will be conducted.

If the pumping lasts less than eight (8) hours due to equipment failure, the well shall be allowed to recover for a period of time, equal to twice the pumping interval, and the pumping restarted at no additional cost to the Government.

Protection of Ground Water Quality: Exercise precautions to prevent foreign materials and surface water from entering the well.

1. Pump Installation The depth of the submersible pump installation and the pumping rates shall be discussed between the Contractor and the Government, and shall be agreed to by the COR. The anticipated depth of the pump setting is shown below:

Estimated Static Water Level – 260 feet

Estimated Pumping Water Level – up to 1,100 feet

Estimated Test Pumping Rate – up to 20 gpm

Pump Setting – up to 1,100 feet

2. Pumping Period, Rate, and Data Required

The well shall be allowed to rest for a minimum of eight (8) hours after the installation of the 5 HP submersible pump and prior to the start of the pumping.

The static water level shall be measured and recorded prior to the start of the pumping.

Beginning at the agreed upon initial pump rate, begin pumping. Well pumping shall proceed continuously for eight (8) hours minimum, or longer if necessary. Measure and record the drawdown at intervals not to exceed 10 minute periods or 5-foot drawdowns during the first hour of pumping.

After the first hour, the drawdown shall be measured and recorded at intervals not to exceed one hour or a 1-foot drawdown. If the drawdown has stabilized, increase the pump rate as agreed previously by the COR. Any changes in pump rate shall be measured and recorded. As the eight (8) hours of time allows, continue to adjust the pump rate as necessary until the yield of the well is closely determined. The maximum rate of pumping shall be at the maximum capacity of the well, or the rate of 10 gpm as shown in the previous paragraph, whichever is less.

At the end of the pumping period, measurements of the well recovery shall be taken at five (5) minute intervals during the first 30 minutes and at ten (10) minute intervals during the remainder of the first hour. Hourly measurements shall be made thereafter until the static water level is essentially re-established.

3. Written Report The Contractor shall submit a written report for each well outlining the results of the test pumping and recording the following data. The Contractor shall submit this report within fifteen (15) days of well completion.

A. Static Water Level – This is the distance from the measuring point, and referenced to the ground surface, to the water level in the well before the pumping is started.

B. Pumping Rate – The pumping rate shall be determined by the use of a totalizing flow-meter or orifice weir to be furnished by the Contractor. In addition, the pumping rate shall be checked by recording the time required to fill a container of known capacity or by recording the head of a 90 degree, V-notched weir. The capacity of the measuring container shall not exceed the capacity of a 55 gallon barrel. Any changes in the pumping rate during the test shall be measured and recorded.

C. Drawdown – This is the distance below the static water level to the water level in the well while pumping is in progress. This distance shall be measured and recorded according to the requirements of the previous paragraph.

D. Residual Drawdown – This is the distance below the static water level to the recovering water level in the well after pumping has stopped. This distance shall be measured and recorded according to the requirements of the previous paragraph.

E. Inlet Depth – The Contractor’s recommendation of the pump inlet elevation, based on the results of the pumping and the Contractor’s experience, for 5 HP submersible pump installation.

F. Well Production – The Contractor’s estimate of the probable well production based on the results of the pumping and the Contractor’s experience.

200.10 – SUBMERSIBLE PUMP

1. Equipment Startup The Contractor shall inspect the complete pump installation during system startup to ensure proper operation. Certification shall be furnished by the Contractor that the pump starter, installation, and connections are adequate to protect the pump motor under normal operating conditions and/or abnormal power conditions such as lightning surges, over/under voltage, etc. when protective devices are specified. A complete check on electrical and hydraulic characteristics of pump installation shall be made in the presence of the C.O.R. and a report submitted to the C.O.R.

Characteristics to report on are as follows:

2. Power Off (Leads Disconnected) A. Motor winding resistance readings before and after pump installation.

B. Motor cable resistance readings before and after pump installation

C. Repeat resistance readings after one hour of pump operation (hot motor).

3. Power On

A. Record temperature of water pumped from well.

B. Supply voltage (all leads) at normal operating head at total dynamic head (TDH).

C. Line current (all leads) at normal operating head (TDH).

D. Discharge and drawdown at total dynamic head (TDH) after a minimum 1-hour pumping duration.

Note any vibration in pump during operation and make applicable corrections.

200.11 – SUBMERSIBLE PUMP PRODUCTS

1. Pump

A. The Contractor shall provide the COR with specifications and technical data pertaining to the pump capacity, efficiency, and power requirements. The pump shall be sized to meet the actual well conditions and be equipped with direct connected electric motor with NEMA size 1 motor starter.

B. The pump shall have sufficient capacity to efficiently operate under the following conditions:

Pumping rate: 6 – 10 gpm, minimum

Total Dynamic Head (TDH): 1,200 feet

Horsepower: 5 HP These specifications are based on the “Goulds” pump curve for the stainless steel, submersible pump, Goulds Model type - 10GS50, 5 HP, 3-phase, 230 volts. Other pumps will be equally considered based upon meeting the above listed salient characteristics. Submittal to be provided to COR. The pump will eventually lift water to a storage tank located approximately 81 feet above the wellhead elevation.

If the conditions vary significantly from the anticipated results, thereby altering the pump needs, a pump matching the well conditions will be installed and an adjustment will be made in the payment for the submersible well pump.

2. Pump Assembly

The impellers/diffusers shall be of Lexan, and Noryl or corrosion resistant and non-toxic; accurately machined/fabricated, finished, and balanced. They shall be semi-open or enclosed type, securely fastened to the impeller shaft which shall be of stainless steel or corrosion-resistant metal. The pump assembly shall have a device for carrying momentary upthrust loads. A check valve shall be installed at the top of the pump. The assembly enclosure shall be stainless steel with corrosive-resistant coating.

3. Pump Motor The motor shall be for 60 cycle, three phase, 230 volt operation with 3450 RPM minimum. The pump motor shall be designed especially for submersible use with vacuum impregnated winding completely sealed off from contact with water. The motor shall have sufficient power to efficiently and continuously operate the pump at the listed capacity and head without exceeding the normal horsepower rating; service factor shall apply to infrequent short-time overloads only and should not be infringed upon during normal operating conditions. The motor leads shall be protected by a metal guard where they pass the pump bowls. The motor shall be capable of continuous operation under water, with protected submersible power cable, UL 778 listed.

4. Well Pump Controls

A. New Control System: A variable frequency constant pressure controller shall be installed in a NEMA 3R Enclosure (Rainproof, outdoor rated enclosure) inside the existing control building. A recommended model from ITT, CentriPro, Balanced Flow, BF50, Constant Pressure Controller for 5 HP Submersible Pump, or an approved equal meeting the following characteristics:

1. Controller Temperature Range:

a. Min. Ambient Temp – 0°F

b. Max. Ambient Temp – 122°F

c. UL 508C Listed

2. Input Voltage: Single phase, 230 Volt.

3. Output Voltage: Three-phase power to the motor, variable frequency and voltage.

4. Constant Pressure: Provides consistent pressure even as flow requirements vary.

5. Controller shall provide pump protection and act as troubleshooting device.

6. Adjustable Dry Well Sensitivity Switch

7. Integral Surge Protection

5. Power Cable The power cable supplying the motor shall be of a type suitable for the application with adequate strength for the length of cable vertically supported in the well. The cable shall be sized to limit the voltage drop to no more than 2 percent at the motor terminals. The cable shall have the following characteristics:

A. Type: THW-Twisted, unjacketed, submersible pump cable

B. Insulation: Thermoplastic polyvinyl chloride (PVC)

C. Color coding: black, red, yellow, green (ground)

D. UL Standard 83.

E. Size: #4/3 with ground

6. Strainer The strainer shall have a net inlet area at least four times the intake area of the pump. The strainer shall be of corrosion-resistant metal.

7. Column Pipe The column pipe shall match selected well pump’s discharge tapping and be of size and material recommended by the manufacturer, if other submersible pump is selected from section above.

The pipe size matching the recommended unit above shall be 1-1/4-inch, Schedule 40, galvanized steel pipe with steel threaded American Petroleum Institute (API) couplings with check valves installed every 300-feet.

8. Pitless Well Adapter The pitless well adapter shall be a heavy duty type adequate to support the column pipe installation having the following characteristics:

Minimum 36” bury depth

All brass construction, tested to 150 psi, fits 6” casing, slide type with O-ring gaskets for complete seal. Teal or Dicken type or approved equal.

Threaded discharge connection. Contractor shall install 1-1/4” galvanized steel discharge pipe at least a minimum of 5-feet from the well and make final connections to the plumbing which will be stubbed up.

9. Well Cap The well cap shall be an approved removable watertight conduit type and shall be vented per ADEQ requirements.

200.12 – GRAVEL FILTER PACK

Sieve analysis shall be performed for grain and particle size distribution of the aquifer material. Based on the size and uniformity, a gravel pack shall be selected. After selection of the proper gravel pack, the well screen shutter/louver size shall be determined. Filter pack material shall minimize the amount of fine-grained sediment entering the well; allow for proper well development; not inhibit the inflow of water to the well; and not affect the chemistry of water samples taken from the well.

1. Filter Material: The filter media should consist of either of the following materials:

a. Silica-based material.

b. Fine Gravel

2. Material Cleanliness: Filter material must be clean to minimize filter pack collapse and reduce well development time. Treat all filter material with 50 mg/L chlorine solution prior to placement to ensure it doesn't contaminate the well.

3. Grain Size/Uniformity: The silica sand or gravel should be of a uniform size. Base the grain size of the filter pack placed in well, in water-bearing zones, to be composed of non-cohesive granular materials upon a representative sieve analysis of the formation materials opposite the well screen. Chose a filter pack material with a d-30 grain size (30 percent passing) 4 to 6 times larger than the d-30 grain size of the finest formation materials screened, and a uniformity coefficient of 2.5 or less. Use a multiplier of 4 for fine-grained, uniform, poorly graded or well sorted formation materials, and a multiplier of 6 for non-uniform well graded or poorly sorted materials.

4. Grain Shape: Well-rounded and sorted grains should be used to reduce drawdown, increase yield and allow for more effective development.

5. Filter Volume: Do not extend the filter pack more than three (3) feet above the top, or one (1) foot below the bottom of the well screen. Prior to filter pack placement, calculate the volume of filter pack material required. Record calculated and actual volumes used, and report these volumes in the Well Driller’s Log.

6. Gravel Fill Pipe: Pipe shall be Schedule 40 PVC conduit extending vertically from above the surface of the sanitary seal, past the bottom of any other annular seals, into the top of the gravel pack filling the annular space of the well. This shall be used during and immediately after well development.

Place the filter pack material through fill pipe to ensure positive placement.

If the fluid level in the well is within about 10 feet of the top of the well screen, set the pipe above the fluid level, to avoid plugging pipe during filter pack placement.

If the fluid level in the well is greater than about 10 feet above the top of the well screen, the pipe may need to be set deeper than the fluid level, and placement of the filter pack through the pipe may require the use of water to wash the filter pack through the pipe.

During development, the gravel pack compresses and volume is lost due to settling and may become necessary to add more gravel to the top of the pack through the gravel fill pipe.

Sound the top of the filter pack frequently during placement, and following installation, to ensure that the filter pack is not bridging in the annulus, and to document final placement depth.

200.13 – FILTER PACK SEAL

The filter pack seal shall consist of a two (2) foot thick fine-grained sand cushion overlaid by a three (3) foot thick grout seal, placed in the annulus above the gravel filter pack.

A. Sand Cushion: Use sand with a d-50 grain size two to three times finer than the d-50 grain size of the filter pack material, but no coarser than 20 mesh.

B. Grout Seal: For the grout seal, use type and method of placement consistent with Section 200.06 of these specifications.

Sound the top of both the sand cushion and grout seal following installation to check for proper placement. Record these measurements on the Well Driller’s Log.

200.14 – ANNULAR SEAL

Seal the entire annular space from the top of the grout seal above the gravel filter pack to the bottom of the surface seal. Leave temporary casings in the hole prior to grouting to prevent caving of the borehole or vertical migration of contaminants within the borehole. Withdraw temporary casing slowly as the well is backfilled with grout.

Allow the annular seal to set for at least 24 hours prior to installing the well cap and surface seal. Seal off any settlement of the annual seal before installing the well cap and surface seal.

200.15 – DISINFECTION

Upon completion of the well and test pumping, the well shall be disinfected as per Arizona Department of Environmental Quality, Engineering Bulletin #8, “Disinfection of Water Systems.”

A. Gravel. Gravel used in gravel-packed wells shall come from clean sources and should be thoroughly washed before being placed in the well. Gravel purchased from a supplier should be washed at the pit or plant prior to delivery to the well site.

B. During placement of the gravel in the annular space disinfectants (usually calcium hypochlorite in tablet or granular form) shall be added to the gravel at a uniform rate (two tablets per cubic foot or one pound of the granular form per cubic yard).

C. Lubricants. Mud and water used as a drilling lubricant shall be free from sewage contamination. Oil and water used for lubrication of the pump and pump bearing shall also be free from contamination.

200.16 – WATER TESTING

The Government will be responsible for obtaining and testing all necessary water samples.

200.17 – SITE CLEANUP

Upon completion of all work specified, the Contractor shall remove from each drilling site all non-Government owned equipment and materials not originally present before the Contractor’s move-in occurred. The ground shall be returned, as near as possible, to the original topography. All work shall be done to the COR’s satisfaction.

200.18 – AS-BUILT DRAWINGS

The Contractor shall maintain a set of the contract drawings depicting as-built conditions. These drawings shall be maintained in a current condition and shall be available for review. All variations from contract drawings shall be indicated in red on the drawings. Upon completion of the contract work, as built drawings shall be submitted to the Contracting Officer (CO) or Contracting Officer Representative (COR).

200.19 – ELECTRICAL DISTRIBUTION AND BUILDING ELECTRICAL SYSTEM

The Contractor shall perform all work necessary and required to accomplish the task as detailed on the drawings and discussed in the installation notes. Work includes furnishing and installing all the electrical components from the submersible pump and motor to the new pump control and the service entrance, and install all necessary accessories to make the new well operable. The existing water tank control wiring will need to be relocated and extended from the existing pump control panel to new pump control panel to permit automatic operation of filling the water storage tank. Existing well pump controls shall be modified to allow only manual switch operation.

Electrical service is available at the control building. Contractor may need to set up a temporary panel with receptacles for construction use only and shall be removed at end of contract.

The materials referred to by trade name, make, or catalog number shall be regarded as establishing a standard of quality; substitutions of equal quality can be made by submitting a data sheet of the proposed substituted item to the Engineer, for approval.

Conduit Fittings: Corrosion and leak resistant standard fittings designed for use with the conduit furnished.

Service Requirements: Single phase, 110/230 V power is supplied to the site. The submersible well pump motor will require a three-phase power.

The installation shall conform to the most current edition of the National Electrical Code and to the requirements specified herein.

All equipment and materials shall be new (unless indicated or specified otherwise). The Contractor shall submit proof, if requested by the Contracting Officer, that the materials, appliances, equipment, or devices that he/she furnishes and installs under this contract meet the requirements of the Underwriters Laboratories, Inc., as regards to fire and casualty hazards. The label of, or listing by, the Underwriters' Laboratories, Inc., will be accepted as conforming with this requirement. In lieu of the label or listing, the Contractor may submit independent proof satisfactory to the Contracting Officer that the materials, appliances, or devices conform to the published standards, including methods of test, of the Underwriters' Laboratories, Inc. The contract drawings indicate the extent and the general location and arrangement of equipment, conduit, and wiring.

The Contractor shall study building plans and details so the outlets and equipment will be properly located and readily accessible.:

Installation of all electrical equipment as mentioned herein shall be done under the supervision of a licensed electrician and in accordance with the National Electrical Code, most current edition.

All work will comply with specifications and methods established by local jurisdictions and/or utility companies. Should a conflict arise in the appplication of appropriate codes or specifications the direction of the local jurisdiction or utility shall prevail.

Trenching excavation and backfill will be performed by another contract which will coincide with this contract. The electrical and water utilities will be stubbed up approximately 5-feet from the proposed well site and adjacent to the control building for final connections under this contract.

END OF SECTION 200

SECTION 300 – MEASUREMENT AND PAYMENT

300.01 – GENERAL

Any work performed without the authorization of the COR will not be measured or paid for. Any materials not incorporated into the work will not be paid for. The Contractor shall be responsible for purchasing the types and quantities of materials necessary to complete this project.

Payment for the various items as specified herein shall constitute full compensation for furnishing all plant, labor, equipment, appliances, materials, and performing all operations required to complete the work in conformity with the drawings and specifications. All incidental costs in connection with work not specifically mentioned in the measurement and payment items shall be included in the contract prices for the items listed.

300.02 – PAYMENT

1. Mobilization and Demobilization Payment for this item will be made under Item 1 – Mobilization, at the applicable Unit Price. This work shall consist of preparatory work and operations necessary for the movement of personnel, equipment, supplies, and operations that must be performed or that cause costs to be incurred prior to beginning work on the various items on the project site. The method of measurement will be as designated in the Schedule of Items. Mobilization will be paid for at the contract unit price for the item as shown in the Schedule of Items. Progress payments will be made as follows:

A. When five (5) percent or more of the original contract amount is earned from other pay items, fifty (50) percent of the amount for mobilization, or five (5) percent of the original contract amount, whichever is less, will be paid.

B. When ten (10) percent or more of the original contact amount is earned from other pay items, one hundred (100) percent of the amount for mobilization, or ten (10) percent of the original contract amount, whichever is less, will be paid.

C. Upon completion of all work on the project, any unpaid amount for mobilization will be paid.

2. 16-in Diameter Drilling Bore Hole for Surface Casing This item will be considered to include the drilling of a 16-inch diameter or larger hole. The number of linear feet of drilling will be measured by determining the actual distance from the ground surface to the total depth of drilling. Payment for this item will be made under Item 2 – 16-inch Diameter Bore Hole, at the applicable Unit Price and will be considered to include compensation for minor formation testing.

3. Sanitary Surface Seal

This item will be considered to include all work necessary to install the 12” surface casing and a proper concrete surface seal to provide protection from any leakage and to keep runoff from entering the wellhead. Positive drainage shall be directed away from the well AS SHOWN ON DRAWINGS. Payment for this item will be made under Item 3 – Sanitary Surface Seal – 20 ft, at the applicable unit price and will be considered to include compensation for all surface casing, concrete work and accessories, watertight well caps, pitless adapter, and completing the plumbing connection to end of stubbed up waterline from other contract from the existing control building.

4. Well Drilling for Production Casing This item will be considered to include the drilling of a 12-inch or larger hole. Include in this pay item all incidental site work, such as the installation of portable containment basins/tanks or the excavation of temporary containment pits and berms, and general site restoration and cleanup. The number of linear feet of drilling will be measured by determining the actual distance from the bottom of the surface casing to the total depth of drilling. Payment for this item will be made under Item 4 – 12-inch Bore Hole to Drill (20’ to 1,200’), at the applicable Unit Price and will be considered to include compensation for minor formation testing and any necessary site work as described above.

5. Steel Casing, 6-Inch Diam. Blank This item will be considered to include the installation of 6-inch blank casing, minimum 3/16-inch wall thickness. The number of linear feet of 6-inch blank casing to be paid for will be determined by measuring the actual length of casing installed. Payment for this item will be made under Item 5 – 6-in diam., Steel Blank Well Casing, at the applicable Unit Price and will be considered to include compensation for furnishing and placing the surface casing, welding, grouting, and all casing accessories required.

6. Steel Casing, 6-Inch Diam, Ful Flo Shutter Screen

This item will be considered to include the installation of 6-inch diameter, 3/16-in wall thickness minimum, shutter (louvered) screen casing. The number of linear feet of 6-inch shutter screen type casing to be paid for will be determined by measuring the actual length of casing installed.