B08_-_Atch_1_-_SOW_MOJA_Connect_Rockin_L_to_HITW_Water_System.pdf

Mojave National Preserve

San Bernardino County, California

STATEMENT OF WORK:

Connect Rocking L Residence to Hole-in-the-Wall Water System, By: Steven Bosiljevac, P.E. February 2023

CONTRACT PRICE SCHEDULE

PMIS NO. 320838

Connect Rocking L Residence to Hole-in-the-Wall Water System

Offerors are required to submit an offer that conforms to the Solicitation with pricing for Contract Price Schedule’s Base Line Items - failure to do so may render the offer non-responsive. On lump-sum price items, provide total cost only; on unit price items, provide the unit price and the extended amount of total price for the item. If no price item exists for a portion of the work, include the costs in a related price item. In case of error in extension of prices, unit price governs. In case of error in summation, the total of the corrected price item amount governs. Round totals and extend prices to whole dollars. Pricing will be evaluated based on what is determined to be the best value to the Government.

Price award will be made based upon the following equation.

Equation 1: Base Price

Base Price:

Base Price: Price Items 1 through 7.

CONTRACT CONTRACT

LINE ITEM LINE ITEM TITLE

NUMBER

(CLIN)

QUANTITY AND

UNIT OF

MEASURE

UNIT PRICE TOTAL PRICE

BASE LINE ITEMS

1.

Mobilization/Demobilization 1 LS @$________ =$_________

2.

2-inch HDPE DR 9 IPS Water Main and Appurtenances

11,000 LF *NTE @$________ =$_________

3.

Float Valve 1 LS @$________ =$_________

4.

Duplex Booster Pump System 1 LS @$________ =$_________

5.

Solar PV Power Supply System 1 LS @$________ =$_________

6.

Vehicle Protection Bollard 10 EA @$________ =$_________

7.

Destroy 33M1 Water Well 1 LS @$________ =$_________

TOTAL BASE PRICE – (Items 1 to 7) --------------------------------------------------------

*NTE: Not-To-Exceed quantity

END OF SECTION

MOJA 320838 – Connect Hole-in-the-Wall Water System to Rocking L Residence

STATEMENT OF WORK (SOW)

1. PROJECT LOCATION

Mojave National Preserve is located in Eastern San Bernardino County 2 hours east of Barstow, CA. The work site is 30 miles north of Essex, CA on Black Canyon Road at the Hole-in-the Wall campground water system and the NPS housing unit of the Rocking L residence.

2. OBJECTIVES:

This project will replace the failing existing 33M1 water well as the water source for the Rocking L residence with potable water from the Hole-in-the-Wall water system by installing new 2-inch diameter HDPE water line from the below grade reinforced concrete water storage tank to the the above ground HDPE water storage tank serving the Rocking L residence and installing a duplex booster pump system with solar PV electrical power source to pump potable water up to the Rocking L residence.

3. PLACE OF PERFORMANCE:

Well 8K1, Section 8, Township 11 N, Range 15 E, San Bernardino County, CA

Permitted Work Hours: Monday through Friday, 7:00am – 5:00pm

4. PERIOD OF PERFORMANCE:

The Contracting Officer will specify the Period of Performance in the Construction Contract.

5. SUMMARY OF WORK:

Approximately 11,000 linear feet of new 2-inch diameter HDPE potable water pipe will be installed between the Rocking K residence’s existing above ground HDPE water storage tank and the existing below grade reinforced concrete water storage tank of the Hole-in-the-Wall potable water system, along with gate valves, air release valves (ARV), water flow meters, a blow-off hydrant, and a daylight drain. In the existing below grade reinforced concrete water storage tank’s valve vault a new duplex booster pump system with integral electrical controls and 2-inch diameter schedule 80 PVC supply piping will be installed (requiring penetrations through the reinforced concrete wall of the water storage tank.) A new pole-mounted solar PV power system will be installed above ground in close proximity to the new duplex booster pump system to provide electrical power to this new duplex booster pump system and its electrical controls. In the existing above ground HDPE water storage tank at the Rocking L water storage tank’s a new float valve will be installed.

6. DESCRIPTIONS OF WORK ITEMS:

Under this contract, the contractor shall complete the following work items in accordance with the requirements given in these specifications:

A. General:

1. The intent of this section is to explain, in general, what is and what is not included in a Contract Price Schedule Line Items, and the limits where one Contract Price schedule Line Item ends and another begins.

2. The total contract price must cover all work required by the Contract Documents.

All costs in connection with the proper and successful completion of the work, including furnishing all materials, equipment, supplies, and appurtenances;

providing all construction equipment and tools; and performing all necessary labor and supervision to fully complete the work, must be included in the unit and lump sum prices of the Contract Price Schedule Line Items. All work not specifically set forth as a pay item in the Contract Price Schedule Line Items must be considered subsidiary obligations of the Contractor and all costs in connection therewith must be included in the prices submitted for the Contract Price Schedule Line Items.

3. If no Contract Price Schedule Line Item exists for a portion of the work, include the costs in a related Contract Price Schedule Line Item.

4. The description of the work of this section constitutes a summary of the work for the purpose of defining the Base Contract Price Schedule Line Items and Contract Price Schedule Option Items and is not intended to provide a detailed and exhaustive description of all aspects of the entirety of the work. For the complete and comprehensive description of the work all documents pertaining to the Contract Documents must be collectively taken into account.

B. Estimated Quantities:

1. All estimated quantities stipulated in the Contract Price Schedule or other Contact Documents are approximate and are to be used only:

a. As a basis for estimating the probable cost of the work.

b. For the purpose of comparing the Contract Price Schedules submitted for the work.

2. The basis of payment for unit price work and materials will be the actual amount of work done and materials furnished up to the not-to-exceed quantity.

3. Except where otherwise specified the unit or lump sum price for each item of work that involves boring, drilling, excavation or trenching, backfilling, drilling mud containment and removal, borehole cuttings containment and removal must include all costs for such work.

C. CLIN 1 – Mobilization and Demobilization - This line item consists of mobilizing and demobilizing all required equipment and construction materials to the site along with preparation of the site in order to initiate work and then site cleanup at the end of the work. Measurement will be by lump sum.

D. CLIN 2 - 2-inch HDPE DR 9 IPS Water Main and Appurtenances: Install 11,000 linear feet of new 2-inch DR 9 IPS HDPE potable water pipe to connect the Rocking L residences above ground HDPE water storage tank (nominal 2,500-gallon capacity) to the below grade reinforced concrete water storage tank (nominal 36,000-gallon capacity) of the Hole-in-the-Wall water system. Payment will be made at the Contract unit price per each linear foot up to the Not-to-Exceed amount of 11,000 linear feet.

1. This item includes furnishing all materials, equipment, and labor for installation of a 2-inch waterline as specified and valves, water meters, combination air/vac release valves (ARV), etc., and associated appurtenances. The work also includes, but is not limited to, potholing, clearing, grubbing, excavation, dewatering, bedding, backfill, compaction, piping, fittings, thrust restraint, pressure testing, disinfection & water quality testing, pipe identification, tracer wire with pull boxes, and all other work necessary to complete the installation.

2. The top of pipe must be at least thirty (30) inches below ground surface (within roadway) and twenty-four (24) inches in all other areas and backfilled with appropriate backfill material (see materials specifications). Deeper depth of bury is required where necessary to ensure the slope of the water line between combination air/vac release valves (ARV) is greater than zero.

3. The 2-inch HDPE water line’s alignment within the roadway corridors shall be along the south-side shoulder of the unimproved roadway up to the Rocking L residence. Tracer wire shall be installed on the north side of the (N) 2-inch HDPE water line in the 0900 hours position (looking east) and detectable water utility warning tape shall be buried directly above the (N) 2-inch HDPE water line at a depth of approximately 8-inches below the ground surface.

4. Install new combination air/vac release valves (ARV) at the inflection high points on the new water line. The ARVs shall have their vent piping 18-inches above the surrounding ground surface. The ARVs shall be installed in H20 load rated utility boxes.

5. Install frost-free hydrant at Rocking L residence. This includes three (3) isolation valves (three 2-inch gate valves on the 2-inch HDPE water line on either side of the 2” x 2” x 2” tee for the frost-free hydrant to allow flushing of the main in either direction without having to flow the flush water through the new water meter to be installed near the above ground HDPE water storage tank serving the Rocking L residence.

6. Install blow-off valve in proximity to the below grade reinforced concrete water storage tank. Installation includes one gate valve on the downstream side of the water main – to allow pumping to daylight from the duplex booster pump system

– and one on the blow-off valve side of the tee off of the 2-inch water line. This includes three (3) isolation valves (three 2-inch gate valves on the 2-inch HDPE water line on either side of the 2” x 2” x 2” tee for the blow-off valve to allow flushing of the main in either direction without having to flow the flush water through the new water meter to be installed near the below grade reinforced concrete water storage tank for the Hole-in-the-Wall potable water system.

7. Install new daylight drain at the edge of large wash (local low point) in the road going up to the Rocking L residence. Installation includes one gate valve on the upstream side of the water main – to allow flowing water from the above ground HDPE water storage tank out through the daylight drain – and one on the daylight drain side of the tee off of the 2-inch water line.

8. Install one water meter with integral air relief valve and ball valve in proximity to the below grade reinforced concrete water storage tank and one water meter with integral ball valve in proximity to the above ground HDPE water storage tank.

The water meters shall be installed in water meter boxes with an H20 load rating.

9. Install 2-inch HDPE by-pass piping (with associated isolation valves) around both of the water meters.

10. Install gate valves at locations called out on water line graphics in the appendices.

E. CLIN 3 - Float Valve: Furnish the materials, equipment, and labor to install a float valve and associated appurtenances in the existing HDPE water storage tank at the Rocking L Residence. The work includes all activities necessary to complete the installation of the float valve in the above ground HDPE water storage tank serving the Rocking L residence. This item will be paid on a lump sum item basis.

1. The top feed inlet line shall be 2-inch diameter schedule 80 PVC.

2. The top feed inlet line shall have a 2” x 2” x 1/2” installed on the end of it inside of the HDPE water storage tank.

3. The float valve shall allow flow through the 2” diameter orifice while the tank is being filled (and flow will also be through the ½” diameter orifice.)

4. The float valve shall close off flow to the 2” diameter orifice when the water level in the tank reaches the tank’s full elevation. At this point there will only be flow into the tank through the ½” orifice - this will result in an increase in pressure in the water line that the booster pump system’s electrical controls’ pressure sensor will detect resulting in the booster pump’s motor being turned off.

F. CLIN 4 - Duplex Booster Pump System: Furnish the materials, equipment, and labor to install the duplex booster pump system in the existing valve vault of the below grade reinforced concrete water storage tank of the Hole-in-the-Wall potable water system.

The work includes all activities necessary to complete the installation of the duplex booster pump system. This item will be paid on a lump sum item basis.

1. Install two submersible pump/motor assemblies in the valve vault of the below grade reinforced concrete water storage tank of the Hole-in-the-Wall public water system.

2. Install each submersible pump/motor assembly vertically inside of a 4-inch diameter schedule 80 PVC pipe containment module with the bottom end sealed with an end cap and the top end sealed with a water-tight sanitary well seal cap with water-tight port for the electrical cable. The total length of this containment module shall be four (4) feet six (6) inches (4’-6”) that has at its upper section (the section of the containment module above the valve vault’s floor elevation) a 4” x 4” x 2” schedule 80 tee that has the 2” socket of the tee connected to the 2-inch schedule 80 supply piping that conveys the pump feed water from the water storage tank compartment to the pump’s inlet. Each of the two booster pump/motor assemblies will require a flow inducer sleeve (aka shroud) installed over the pump’s intake and the motor.

3. Install each 4-inch diameter schedule 80 PVC pipe containment module – with pump/motor assembly encapsulated inside of it – into a 6-inch diameter schedule

80 PVC pipe sleeve that extends three (3) feet six (6) inches below the top of the valve vault’s floor elevation and with its top flush with the top of the valve vault’s top of floor. This requires making an opening in the valve vault’s concrete floor and excavating down to a depth three (3) feet below the top of the valve vault’s floor. Once the six (6) inch schedule 80 PVC pipe sleeve has been installed, the annular space around its outside shall be sealed with non-shrink cement grout up to being flush with the elevation of the valve vault’s floor elevation. In the bottom six (6) inches on the inside of the 6-inch schedule 80 PVC pipe sleeve place ¾-inch gravel. The 4-inch diameter schedule 80 PVC pipe containment module that is 4’-6” long must extend a minimum of eighteen (18) inches above the top of the floor of the valve vault.

4. Connect the feed water 2-inch schedule 80 PVC supply pipe to the 2-inch socket of the 4-inch diameter schedule 80 PVC pipe containment module’s 4” x 4” x 2” tee section. Install a 2-inch schedule 80 PVC ball valve on the supply pipe close to the 4” x 4” x 2” tee section.

5. Securely affix feed water 2-inch schedule 80 PVC supply piping within the valve vault. Make one penetration through the reinforced concrete wall at the center of each of the two compartments of the water storage tank at approximately one (1) foot above the top of the floor of the valve vault. Install the feed water 2-inch schedule 80 PVC supply pipe through the penetrations using water-tight fittings that secure the feed water piping in penetration. The feed water piping shall have five (5) isolation (ball) valves installed on it along with two (2) check valves.

The feed water piping shall be configured to allow flow to both booster pumps from either of the two compartments of the water storage tank. The isolation valving shall be configured to allow for isolating flow to only one booster pump at a time. The configuration of check valves shall be to prevent water moving from the feed water piping into either of the compartments of the water storage tank, regardless of whichever booster pump is receiving feed water.

6. Install the 2-inch schedule 80 PVC booster pump discharge piping up the valve vault wall to two (2) feet below the ground surface at which point the discharge piping shall exit from the valve vault horizontally through penetrations in the reinforced concrete wall – the discharge piping through the penetrations shall be made water-tight. The booster pump outlet fitting is one and a half inches (1.5”) in diameter and requires a 1.5” to 2” transition fitting. A check valve shall be installed (vertical orientation) on each booster pump’s outlet piping on the inside of the valve vault (this is in addition to the booster pump’s integral check valve.)

The 2-inch schedule 80 PVC piping requires a flanged transition fitting on the outside of the valve vault to connect to the new 2-inch DR 9 IPS HDPE buried water line.

7. Install the electrical controls system for the duplex booster pump system in an exterior rated NEMA panel mounted to a metal frame that shall have its vertical support member anchored in concrete footings. The electrical controls system shall be configured to operate the booster pump/motor assemblies in alternating power on (on call) sequencing and there is NOT to be lead-lag function – only one booster pump/motor assembly shall be powered on (on call) for any given pumping cycle.

8. The booster pump/motor assembly on call (power on) shall be set to cycle on (power on) once every 24 hours.

9. The booster pump/motor assembly off call (power off) shall be controlled by the pressure reading (4-20 mA signal) from a pressure sensor installed on the 2-inch schedule 80 PVC booster pump discharge piping. The float valve in the above ground HDPE water storage tank at the Rocking L residence shall close off flow to the 2” diameter orifice when the water level in the tank reaches the tank’s full elevation. At this point there will only be flow into the tank through the ½” orifice -this will result in an increase in pressure in the water line that the booster pump system’s electrical controls’ pressure sensor will detect resulting in the booster pump’s motor being turned off.

10. Demonstration Pumping Final Inspection and Operation Training

a. Demonstrate to the Contracting Officer the functionality of the booster pump system, electrical controls system, and the solar PV electrical power system.

b. Provide training to NPS staff of Mojave National Preserve on the operation of the booster pump system, electrical controls system, and solar PV electrical system and the maintenance. For the training include an O&M manual.

G. CLIN 5 - Solar Photo-Voltaic (PV) Electrical Power System: Furnish the materials, equipment, and labor to install the solar PV electrical power system in proximity to the below grade reinforced concrete water storage tank of the Hole-in-the-Wall potable water system. The work includes all activities necessary to complete the installation of the solar PV electrical power system. This item will be paid on a lump sum item basis.

1. The new solar PV electrical power system shall be sized to provide a minimum of

4 KVA of total effective KVA for a minimum continuous duration of six (6) hours on the winter solstice under cloudy sky conditions.

2. The new solar PV electrical power system shall be an off-grid system.

3. The solar array (aka ensemble of solar panels) shall be mounted on a metal frame above the ground (secured to foundation(s) with appropriate depth below grade) within the existing disturbed area in the immediate vicinity of the below grade reinforced concrete water storage tank of the Hole-in-the-Wall potable water system. The metal frame/foundation shall resist the loading criteria/requirements set forth in ASCE 7 Structural Loads. The Contractor shall pothole to be sure to avoid installing the metal frame/foundation directly on top of any portion of the (E) below grade reinforced concrete potable water storage tank.

4. The balance of the solar PV electrical power system’s components shall be:

wiring/cabling, electrical conduit, switches and control equipment, solar inverter(s), transformer, grounding system, electrical power protection equipment, power conditioner equipment, and all associated appurtenances.

(NOTE: a battery bank and battery charger are NOT included as required equipment and shall not be approved as part of the solar PV electrical system’s components to meet the 4 KVA requirement in D.1 above.)

5. Connection of the solar PV electrical system to the electrical controls system for the duplex booster pump/motor system.

6. The solar PV electrical system components and their configuration shall incorporate best practices to protect against tampering and vandalism.

7. The solar PV electrical system shall be compliant with the NFPA 70 National Electrical Code.

H. CLIN 6 - Vehicle Protection Bollards: This item includes furnishing all materials, equipment, and labor for installation of vehicle protection bollards. The work includes, but is not limited to excavation, backfill, compaction, 6-inch Schedule 40 galvanized steel pipe, concrete (3,000 PSI @ 28 days), and all other work necessary to complete the installation of ten (10) bollards. Payment will be made at the Contract unit price per each bollard up to the Not-to-Exceed amount of 10 bollard units.

1. The new solar PV electrical system shall be protected with new bollards for any portion of the new solar PV electrical system that is outside of the area protected by the existing vehicle protection bollards.

2. Bollards must have a minimum of 42 inches above the ground surface and an embedment depth of 36 inches into the ground.

3. The 6-inch schedule 40 galvanized steel pipe must be centered in a 12-inch diameter concrete anchor having a depth of 40 inches below the ground surface.

The steel bollard must have 3 inches of concrete cover around and below the section embedded in the concrete anchor.

4. The inside annular volume of the 42-inch section of the steel bollard above the ground must be filled with concrete and domed at the top ½ inch above the steel pipe to prevent standing water.

5. The exterior of the section of the steel bollard extending above the ground surface must be painted with AASHTO approved safety white reflective paint for exterior metal surfaces.

6. Two of the bollards shall be configured to allow for the bollards to be removed to allow authorized vehicle access into the area protected by the bollards.

I. CLIN 7 - Destroy Water Well: This item includes furnishing all materials, equipment, and labor to destroy the 33M1 water well which includes removing the existing pump/motor assembly and associated well string from the well.

1. The destruction of the existing 33M1 water well shall be done in strict accordance with the Water Well Standard: State of California, requirements of San Bernardino County, and requirements of the California State Water Resources Control Board.

2. The destruction of the 33M1 water well, the permitting process with the state and county, and the submission of the official Well Completion Report to the state using the state’s web portal are all work that must be carried out by a contractor with a valid California C-57 – Well Drilling Contractor

3. The 33M1 well was constructed in the early 1970s, is approximately 718 feet below the ground surface and is cased with 8-inch mild steel casing. The screen interval is unknown. It is most likely the well screen was field fabricated from 8-inch mild steel casing that had slots either saw cut into it or acetylene torch cut.

4. The existing pump/motor assembly is to be salvaged and will remain the property of the government.

5. The existing well string shall be demolished and legally disposed of outside of the Park.

6. The Contractor shall not proceed with destroying the 33M1 water well until the Contractor has successfully completed the Demonstration Pumping Final Inspection and Operation Training and the duplex booster pump system has been officially designated by the Contracting Officer to be in beneficial use status.

7. MATERIAL REQUIREMENTS:

A. All potable water system components must be meet AWWA Standards including NSF 61 Certification.

B. All electrical components (pump motors, electrical controls, solar PV power system, and associated components) shall comply with NFPA 70 National Electrical Code. All electrical equipment panels/enclosures (both above ground and within the water tank’s valve vault) shall meet NEMA exterior rating.

C. All material items listed require submittal to the Contracting Officer for approval prior to procurement.

D. 2-inch HDPE Pipe and Fittings - Shall be of PE 4700 DR 9 IPS and meet AWWA Standards for HDPE water pipe and fittings.

E. 2-inch PVC Pipe and Fittings – Shall be of schedule 80 PVC and meet ASTM Standards for schedule 80 PVC.

F. 2-inch Gate Valves with Valve Can - Shall meet AWWA Standards for Resilient-Seated Gate

Valves, and the valve can shall be rated for H20 loading.

G. 2-inch Ball Valves - Shall be of Schedule 80 PVC and meet AWWA Standards for PVC valves.

H. 2-inch Check Valve – Shall meet AWWA Standards for Check Valves.

I. Combination Air/Vac Release Valve (ARV) with Utility Box shall meet AWWA Standards for combination air and vacuum release valves (lead free) and the utility box shall be rated for H20 loading.

J. 1-inch Frost-Free Yard Hydrant – Shall meet AWWA Standards, have backflow protection, be automatic draining and freezeless; have an internal reservoir below the frost line that is sealed to prevent entry of ground water or surface water into the reservoir. Pre-Approved hydrant meeting salient features listed above: Woodford Model S3.

K. Submersible Pump/Motor Assembly – The pump component requirements:

1. Valve casing made of polyamide

2. Discharge chamber made of 304 stainless steel

3. Valve guide made of polyamide

4. Valve spring made of 316LN stainless steel

5. Valve cone made of polyamide

6. Valve seat made of NBR rubber

7. O-ring made of NBR rubber

8. Lock ring made of 310 stainless steel

9. Top bearing made of NBR rubber

10. Top chamber made of polyamide

11. Guide vanes made of polyamide

12. Impeller made of Polyamide with tungsten carbide bearings

13. Bottom chamber made of polyamide

14. Bearing made of ceramic

15. Suction interconnector made of polyamide

16. Ring made of 304 stainless steel

17. Cone for pressure stabilization made of polyamide

18. Spacer made of polyamide

19. Sand trap made of 316 stainless steel

20. Shaft with coupling made of 304 stainless steel

21. Cable guard made of 304 stainless steel

22. Fluid pumped is water at less than 104 degrees Fahrenheit

23. Pump outlet is 1.5 inches NPT

24. Maximum diameter of 3 inches

25. Q=13.3 US gallons per minute against a TDH of 263.9 feet

26. Stages 6

27. Built in non-return valve

28. Compatible connection to motor with easy disconnect functionality

29. Pre-approved pump meeting salient features listed above: Grundfos 22 SQF-220

L. Submersible Pump/Motor Assembly – The motor component requirements:

1. Power input of at or below 2.5 kW (related voltage AC of 1x90-240 V; rated voltage

DC 100-300 V; rated current of 12.5 A; power factor of 1.0)

2. Rated rotational speed of 10,700 rpm

3. Start method of direct-on-line type

4. Enclosure class (IEC 34-5) of IP68 type

5. Insulation class (IEC 85) of F type

6. Built-in motor protection of Y type

7. Thermal protection of internal type

8. Udc of 100 V / 300 V

9. Motor type of permanent-magnet (NOTE: induction motor not acceptable)

10. Integrated soft-start and dry-run protection within the motor housing (not external)

11. Overload and locked rotor protection

12. Over temperature protection

13. High starting torque at low voltage

14. Replaceable motor lead

15. Maximum diameter of 3 inches

16. Compatible connection to pump with easy disconnect functionality

17. Pre-approved motor meeting salient features listed above: Grundfos MSF3

M. Water Meters – Shall be accurately read flows from 0 to 20 gallons per minute, have less than 2 PSI pressure loss at a flow rate of 20 gallons per minute, and meet AWWA Standards for Water Meters.

N. Float Valve – Shall be compliant with the Safe Drinking Water Act requirement for lead, be made of heavy-duty brass main body with stainless steel float.

O. Utility Box – Shall be traffic rated for H20 loading and the lid shall have the utility type written on it (WATER or ELECTRICAL for this project.)

P. Water Utility Warning Tape – Shall be blue in color and detectable.

Q. Utility Tracer Wire – Shall be solid copper wrapped in high molecular weight polyethylene insulation and blue in color.

R. Metal Framing System – Shall be made from high-corrosion resistant steel alloy and be modular to allow for ease of configuring supports and frames without requiring welding or drilling holes for mounting hardware.

S. Native soil free of rocks, organic material, and debris may be used for backfill. Place backfill materials in horizontal layers not exceeding 8 inches in loose depth. Compact each layer, at optimum moisture content to a density equal to surrounding ground. Above and below the pipe a minimum of 6-inches must be Sieve Size Percent Passing, 1/2-inch 100%, No. 4 50- 80%, No. 40 10- 25%. Note: If the native soil meets these sieve size requirements, then bedding under the water line is not required.

8. TRENCHING GUIDELINES:

A. Excavate the trench to the approximate level of the top of the utility line to be installed, using adequate trench width and side slopes to safely accommodate worker access. Continue excavating for the utility line, to a width not greater than is shown on the appropriate trench detail in Chapter 7 Underground Installation of PE piping, Plastic Pipe Institute (plasticpipe.org.) Note: Trenching done by wheel or chain techniques can excavate directly to the required depth to install the water line when their trench width is just slightly wider than the OD of the water line being installed.

1. Rocky Trench Bottom: Where ledge rock, hard pan, boulders, or sharp-edged materials are encountered, over-excavate a minimum depth of 6 inches below the bottom of the utility exterior wall to permit adequate bedding preparation. The installed utility shall have at least 6 inches of clearance from any rock protrusion.

2. Unstable Trench Bottom: Secure approval of depth of over-excavation and stabilization method. For wet trench construction, use approved method of dewatering through diversion, damming and pumping, well points, or underdrain systems. Dispose of removed fluidized materials as approved. Use select backfill material to build a suitable foundation to within 6 inches of finished utility grade, prior to bedding with the specified material. Do not proceed with utility installation until wet trench and unstable conditions are under control.

3. Trench depth for water line installation in the roadway is a minimum of 30 inches to top of pipe and non-roadway 24 inches to top of pipe.

B. Shoring and sheeting: Construct and maintain all shoring, sheeting, and slope lay-back necessary to protect the excavation, as needed for the safety of the employees and as required by applicable State and Federal laws.

1. For trenches over 5 feet deep, provide suitable barricades for worker protection.

When work area is left open and unattended by Contractor, provide suitable barricades for public safety, regardless of trench depth.

2. For trenches over 4 feet deep, provide suitable exit means in accordance with applicable provisions of OSHA.

3. Do not remove timber or sheeting if it is in a compacted zone. Instead, trim it off at a safe level above that zone.

4. As directed, remove all other sheeting and shoring when safe to do so.

C. Compaction: Use vibratory compactors for sands and gravels (non-cohesive soils). Use mechanical tampers for sand and gravel containing a significant portion of fine-grained material, such as silt and clay (cohesive soils). Hand tamp around pipe, conduit, or cable to protect the lines until adequate cushion is attained. Puddling or water flooding for consolidation of backfill or compaction by wheel rolling with construction equipment will not be permitted.

D. Utility Installation: Shape the trench bottom to ensure uniform contact with the full length of the installed line and remove any sharp-edged materials that might damage the line.

Compaction shall be maintained beneath the line.

1. Select Backfill: Fill by hand placement around the utility to just over half depth, and compact in a manner to ensure against lateral or vertical displacement. Place select backfill to 12 inches above the utility line by hand placement in not more than 6-inch layers.

2. Vehicular Traffic Areas: Fill and compact in 8-inch maximum layers to 95 percent of maximum density.

3. Nontraffic Areas: Fill and compact in 8-inch maximum layers to 90 percent of maximum density.

4. When chain or wheel trenching techniques are used, the trench width need only be slightly wider than the OD of the water line being installed.

9. PRESSURE-TEST OF PIPE SYSTEM:

A. Pressure-Test of Pipe System: Hydrostatic pressure leak tests of new PE pressure piping systems (once the water line is installed, and all isolation valves, blow-off valve, combination air/vac release valves (ARV), and associated appurtenances have also been installed) must be conducted in strict accordance with ASTM International F 2164, Standard Practice for Field Leak Testing of Polyethylene (PE) Pressure Piping Systems Using Hydrostatic Pressure.

1. Pneumatic pressure testing of any water piping system is prohibited in Mojave National Preserve.

2. Where any isolation valves, PRVs, hydrants, combination air valves, and associated appurtenances are installed on the existing water system, a visual leak detection test must be conducted for two (2) hours at the normal working pressure of the water system prior to backfilling. Any detected leakage constitutes a failure of the visual leak test and repairs must be made to eliminate the detected leak.

B. Disinfection of Pipe System: The AWWA C651 (latest edition) Standard for Disinfection of

Water Mains must be adhered to for water system features installed.

C. Plugging of Abandoned Water Line: Legacy water lines that are designated to be abandoned in place once new water lines have been installed (and are in beneficial use where required) must be disconnected from the water system and plugged using non-shrink cement grout.

The plug must fill a minimum of six inches inside the abandoned pipe from the cut end of the pipe.

10. PERMITS:

A. General: The Contractor shall obtain all applicable permits associated with the work and / or comply with all permit conditions. A general building permit is not required for work on NPS land. The following permits must be obtained prior to the commencement of work: Well Destruction Permit for the 33M1 water well.

11. GENERAL REQUIREMENTS (DIVISION 01):

A. Contractors will receive Desert Tortoise training. Work conducted during active tortoise season will require a monitor.

B. Archeological Monitor shall have access to observe all ground-disturbing site work, including construction of temporary facilities, from a safe location mutually agreed on by Contractor and Monitor. As new ground is broken, Monitor will examine excavated materials, using construction layout centerline and perimeter staking as a reference point to record locations of findings.

C. If Archeological Monitor discovers resources, immediate relocation of the work to another area may be required to allow Monitor to take soil samples and record resources. While Archeological Monitor is documenting resources, Contractor shall relocate work to non-sensitive areas where monitoring is not normally required.

D. If resources are discovered while Archeological Monitor is absent, stop work immediately and report the discovery to the Contracting Officer.

E. Construction Camp: Establishment of a camp within the park will not be permitted.

F. There is no electrical service available at the project site. Contractor shall provide a source for electrical power and lighting.

G. No telephone service is available on site for Contractor’s use. Cell service is not available.

H. Up to 500 gallons per day of water is available for the Contractor’s use from the well located at Hole-in-the-Wall. The well can pump approximately 5 gallons per minute. If additional water is required, the Contractor shall furnish water from a source outside the park boundary.

I. Place portable temporary sanitary facilities in approved locations secluded from public observation and convenient to workstations. Relocate as work progress requires. Maintain and clean toilet facilities at least weekly.

J. Completely remove from the Park portable temporary sanitary facilities on completion of work.

K. Dispose of excess excavated material (including rocks and boulders) that cannot be used in construction at a location, as directed by the Contracting Officer, in the Hole in the Wall Area.

Unless otherwise specified, all removed material becomes the property of the Contractor and shall be disposed of legally outside the park. Immediately remove hazardous rubbish from project site. Place other construction debris in refuse containers at least daily. Dispose of refuse at least weekly, in a legal manner, at public or private dumping areas outside the park.

Do not burn or bury refuse inside the park.

L. Before scheduling the final inspection, remove all tools, equipment, surplus materials, and rubbish. Restore or refinish surfaces that are damaged due to work of this contract to original condition. Remove grease, dirt, stains, foreign materials, and labels from finished surfaces.

Thoroughly clean water tank valve vault interior. Pick up all construction debris from the site.

At time of final inspection, project shall be thoroughly clean and ready for use.

M. Keep dust to a minimum at removal site and on haul roads. Use sprinklers or water trucks as necessary.

N. Contractor shall at all times conduct their operations to ensure the least inconvenience to the public.

O. Work Limits and Equipment Access: The Contractor shall limit all work and storage of materials to the work limits of this project. The work limits are:

1. Along Existing Roadways: The work limit shall be the width of the roadway.

2. The alignment of new water lines will be along the shoulder of existing roadway taking into account the alignments of existing buried utilities. Any variation to aligning the new water line differently must be approved by the Contracting Officer.

P. Construction Operations: For the safety and convenience of the public, the Contractor will conduct his operations in a concise and timely manner. The Contractor will complete and clean up each phase of the work within a reasonable time from starting. No more than 300 feet of trench will be open at any one time, with no more than 100 feet open overnight. If pipe-laying work does not continue daily with significant progress, the Contractor shall completely backfill the open trenches.

Q. Public Traffic: Public traffic will be allowed on all roads during construction. Conditions for maintaining public traffic shall be as follows:

1. Signs shall be provided at all times during in-road activities. All signs and traffic control devices shall conform to the Manual of Uniform Traffic Control Devises, Federal Highway Administration, ANSI D6.1. Work shall not start until signs are in place.

2. One lane of traffic shall be maintained along all roads during daylight operations. At night and during weekends, two lanes shall be open to traffic. Barriers shall be erected around all open excavations and material stockpiles.

R. Preservation of Natural Features: Confine all operations to work limits of the project. Prevent damage to natural surroundings. Restore damaged areas, repairing or replacing damaged trees and plants, at no additional expense to the Government.

1. Provide temporary barriers to protect existing trees and plants and root zones.

2. Do not remove, injure, or destroy trees or other plants without prior approval. Consult with Contracting Officer and remove agreed-on roots and branches that interfere with construction.

3. Do not fasten ropes, cables, or guys to existing trees.

4. Carefully supervise excavating, grading, filling, and other construction operations near trees to prevent damage.

S. Existing Utilities: Notify Contracting Officer of proposed locations and times for excavation.

Existing water lines shown are approximate. To permit changes in the event of conflict, the Contractor shall expose existing underground utilities to verify size, location, and elevation.

All utility crossings shall be exposed at least 300 feet in advance of water line installation.

The Contractor shall notify the Contracting Officer in case of conflict and, if necessary, changes will be made to the plans to avoid delays in the Contractor’s work schedule. If damage occurs to a known existing utility, repair utility at no additional expense to the Government.

1. If damage occurs to an unknown utility, repair utility. An equitable adjustment will be made in accordance with the Changes clause of the General Provisions.

2. Interruption of Existing Utility Service: The Contracting Officer shall be notified inwriting at least 48 hours in advance of any shutdown of the existing water system.

Such shutdowns shall be planned and scheduled such that the shutdown period is minimized. Shutdowns to make connections to the existing system shall not exceed 4-hours each.

T. Hauling Restrictions: Comply with all legal load restrictions in the hauling of materials. Load restrictions on park roads are identical to the state load restrictions with such additional regulations as may be imposed by the Park Superintendent. Information regarding rules and regulations for vehicular traffic on park roads may be obtained from the Office of the Park Superintendent. A special permit will not relieve Contractor of liability for damage which may result from moving of equipment.

12. QUALITY ASSURANCE REQUIREMENT:

The contractor shall develop and maintain a quality assurance program to ensure services are performed in accordance with commonly accepted standard practices and in compliance with all applicable code. The contractor shall develop and implement procedures to identify and prevent defective workmanship. As a minimum the contractor shall develop quality control procedures addressing the critical areas identified in this statement of work. The government will periodically evaluate the contractor’s performance in accordance with the statement of work.

Codes & Standards: The Contractor shall complete all work in accordance with the latest versions of applicable codes, standards, and regulations. The following codes and standards are directly related to the project:

A. NFPA 101 (National Fire Protection Association’s Life Safety Code) B. MUCTD Standards and Policies C. Occupational Safety and Health Administration (OSHA) requirements D. California Code of Regulations E. AWWA Standards F. ASTM Standards G. NFPA 70 National Electrical Code H. ASCE 7 Structural Loads

Additional Requirements:

A. All affected areas must be restored to their original condition from before the work began. Any damages will be fixed and repaired at no cost to the government.

B. All new equipment must conform to the manufacturer’s instructions and guidelines.

13. SUBMITTALS:

A. Division 01 documents: The following items must be submitted a minimum of one week prior to the Preconstruction Conference. Contracting Officer will notify Contractor of tentative date for the Pre-Construction Conference.

1. Letter designating Project Superintendent.

2. Construction Schedule.

3. A comprehensive breakdown of the Schedule of Values.

4. Safety Plan.

5. A list of Subcontractors for this project.

6. Written statements from subcontractors certifying compliance with applicable labor standard clauses.

7. Satisfactory evidence of liability insurance coverage and workman’s compensation for the Contactor and all subcontractors.

8. Quality Control Plan.

9. Under-An-Acre Pollution Prevention Plan.

B. Technical Documents Submittals: The following documents shall be submitted to the

Contracting Officer prior to construction mobilization. If these documents have not been received and approved by the NPS prior to construction, the construction start date may be delayed.

1. Product Data – Submit product cut sheets / material data on all products to be used for approval. Indicate the size, model, or type of each recommended product.

2. Samples – When requested, submit a physical sample of a product or an array of color choices for approval, if applicable.

3. Shop Drawings - Submit shop drawings that embody all major elements of the work.

a. Drawings shall be developed in AutoCAD or similar drafting software.

b. Drawings shall include details, dimensions, notational information and other data to ensure the contractor has a complete understanding of the work.

c. Drawings shall be submitted to the Contracting Officer in PDF format. Allow 7 calendar days for the drawings to be reviewed by NPS. The Contractor shall incorporate review comments into the shop drawings and resubmit for final approval.

C. Any work done or orders for materials or services placed before obtaining the

Contracting Officer’s approval shall be at the Contractor’s own risk.

D. Provide a one-year warranty for workmanship, materials, and equipment.

E. Provide pressure test data documenting passed pressure tests of water system following

AWWA Standards for pressure testing HDPE & PVC water lines and appurtenances.

F. O&M Binder submittal organized with tabs and containing the record information

(manufacturer’s cutsheets, O&M requirements, warrantees, etc.) that detail the materials, manufacturers, models, and related data/information needed to carry out the operation and maintenance requirements of the water system components installed under the Contract.

G. Composite As-Constructed Information Closeout Submittal:

1. Document in AutoCAD the as-constructed configuration of the Rocking L water line extension including associated appurtenances employing plan and profile views and details.

a. Conduct a topographic survey of the Rocking L water line extension alignment.

b. Generate in AutoCAD the as-constructed plan and profile of the Rocking

L water line extension alignment with the associated valves and appurtenances.

c. Generate in AutoCAD the as-constructed booster pump system including the electrical controls system and the solar PV electrical power system.

d. Each drawing sheet in the set will have wording added to it that indicates that the As-Constructed drawings include information that has been provided by others for improvements previously constructed.

2. Prepare the Composite As-Constructed Drawing Set of the Hole-in-the-Wall potable water system incorporating the as-constructed information generated in G.1 above and the Government-Furnished Information (See #8 below) to include the following sheets as a minimum:

a. Cover Sheet: Give water system name and location and indicates the drawing set is the Composite As-Constructed Drawing Set for the Hole-in-the-Wall Potable Water System. This sheet will also indicate the classification and system number given by the state of California.

b. Composite Set Index Sheet: Provide in table format the sheets in the drawing set indicating the page number and the title of the sheet. The arrangement of the drawing list shall be done to facilitate incorporation of future sheets into the composite as-constructed drawing set. Space permitting, the Composite Set Index can be placed on the Cover Sheet.

c. Design Analysis Sheet: Provide a to-scale plan layout of the Composite As-Constructed Drawing Set for the Hole-in-the-Wall potable water system information and data for water mains, water storage tanks, supply wells and chlorine treatment system, system electrical controls, isolation valving, fire hydrants, ARVs, PRVs, water meters, frost-free yard hydrants, and other key appurtenances to the water distribution system to include water quality sampling points.

d. Hydraulic Analysis Sheet: Provide a to-scale plan layout with pipe size labeling for distribution mains and water demand data for all service connections to the Hole-in-the-Wall potable water system. Provide a schematic profile layout of the potable water collection system identifying key system elevations. In table format the key data from the peak day’s peak flow analysis and average day’s peak flow analysis.

e. System Layout Index Sheet: Provide in at-a-glance-graphic form the manner in which the remainder of the sheets are organized within the drawing set.

f. Specific System Sheets: These are plan and profile sheets, water tank and site related drawings, production well sheets, standard details for common appurtenances, details for unique system features and equipment, electrical system and controls related sheets, and any other sheets required to convey necessary system information for O&M purposes.

14. GOVERNMENT-FURNISHED PROPERTY, MATERIAL, EQUIPMENT, OR

INFORMATION (GFP, GFM, GFE, OR GFI):

A. GFI FROM PAST PROJECTS MAKING IMPROVEMENTS TO THE HOLE-IN-THE-

WALL POTABLE WATER SYSTEM:

1. MOJA 113 Water System Improvements at Hole-in-the-Wall (construction drawings in PDF and design report in PDF)

2. MOJA 74683 Replace Water Line at Hole-in-the-Wall (construction drawings in both PDF and AutoCAD and preliminary engineering report in PDF)

3. MOJA 234372 Construct New Well to Replace Primary Source to Hole-in-the- Wall (as-constructed information in PDF)

4. MOJA 310142 Replace Components of Hole-in-the-Wall Water System (as-constructed information in PDF)

15. SAFETY REQUIREMENTS:

A. This contractor is to follow at a minimum all OHSA rules and procedures. A required safety plan must be submitted and approved before any work is to begin. This plan shall identify any hazards related to the work and provide measures to follow to mitigate risk.

1. First Aid Equipment: Provide adequate first aid equipment for all contract employees for the hazards associated with the types of ongoing construction work at the site.

2. First Aid Training: Provide adequate training to all Contractor personnel to ensure prompt and efficient…