A06_Enclosure_5.pdf

Red Rock Visitor’s Center Complex

1000 Scenic Loop Drive

Las Vegas, NV 89161

Operation & Maintenance Manual Red Rock Visitor’s Center Water Treatment & Distribution

Red Rock Visitor’s Center

Operation & Maintenance Manual Water Treatment & Distribution i

Table of Contents

1.0 SYSTEM OVERVIEW

1.1 Pump Building

1.2 Water Treatment Plant

1.3 Underground Water Storage Tank

1.4 Water Distribution Pumps

1.4.1 Red Rock Visitor’s Center

1.4.2 Fee Station

2.0 OPERATING THE WATER DISTRIBUTION SYSTEM

2.1 Water Treatment Plant Bypass

2.2 Chlorinator

2.3 Underground Water Storage Tank Valves, Connections, Level Indicators, and Access

2.3.1 Manual Tank Fill, Drain, and Isolation

2.3.2 Tank Level Control and Alarms

2.3.3 Tank Overflow and Maintenance Access

2.4 Well Pump and Water Distribution Pump Controls

2.4.1 Well Pump Control

2.4.2 Water Distribution Pump Controls

2.5 Air Conditioning and Ventilation

3.0 OPERATING THE WATER TREATMENT PLANT

3.1 System Supplier and Point of Contact

3.2 General Information

3.2.1 Water Filtration Media

3.2.2 Fiberglass Treatment Tanks

3.2.3 Treatment System Control Valves

4.0 APPENDICES

A. Red Rock Conservation Area Water System Operation and Maintenance Manuals

B. Hanson’s WaterTreatment O&M Manuals & Warranty

C. Warranty Management Plan: BLM Red Rock Visitors Center Water Supply Well

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1.0 SYSTEM OVERVIEW

This section provides a general description of water flow through the water distribution and treatment systems, from its point of origin at the wellhead to its point of consumption either at the Red Rock Visitor’s Center area or the Red Rock Fee Station. It is illustrated schematically in Figure 1.1. All water treatment and distribution system components listed below are depicted in the as-built drawings, shop drawings, and detailed manufacturer’s Operation and Maintenance (O&M) manuals attached in the Appendices.

Figure 1.1

1.1 Pump Building

The Pump Building is a prefabricated structure manufactured by CXT Precast Products, Building Number MN-141, 12’-0” x 18’-0”, Style: Mendocino (Figures 1.2.a and 1.2.b). This structure houses the water treatment, filtration, and chlorination system for water that comes directly from the well. The Pump Building also contains the water distribution pumps that supply water to the Red Rock Visitor’s Center and to the Red Rock Fee Station. The building is environmentally controlled, using a wall-mounted air conditioner and exhaust fan/louvers for ventilation, as shown in Figure 1.2.b. It houses the controls for the well pump as well as the water distribution pumps.

Figure 1.2.a Figure 1.2.b

Air Conditioner

Louver

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1.2 Water Treatment Plant

The Water Treatment Plant installed in the Pump Building consists of a pair of structural composite pressure vessels made of reinforced fiberglass construction, manufactured by Pentair Water. These vessels contain Katalox Light Advanced Filtration Media designed to filter and remove various constituents including suspended solids, turbidity, odor, and various metals and other elements. Water from the well is pumped directly through these fiberglass vessels where it interacts with the filtration media. Afterwards, the water is metered out of the vessels and passes through a separate sand filter to remove additional sediments, followed by a chlorine injector. The water is then deposited into the Underground Water Storage Tank where it is stored until called for at the Visitor’s Center and the Fee Station.

1.3 Underground Water Storage Tank

The Underground Storage Tank is a 10,000 gallon potable water storage tank manufactured by Xerxes.

When either the Visitor’s Center or the Fee Station call for more water, the corresponding water distribution pump in the Pump Building fulfills that demand by drawing water directly from this tank.

The Xerxes Tank is supplied with treated and chlorinated water that comes directly from the well.

1.4 Water Distribution Pumps

There are three vertical turbine pumps inside the Pump Building that deliver water from the Underground Water Storage Tank to either the Red Rock Visitor’s Center or the Fee Station. Figure 1.3 shows one of the three red pumps. Two pumps are dedicated to supplying the Visitor’s Center and are configured in a lead/lag configuration. The third pump supplies the Fee Station. All pumps are Bell & Gossett, Series VTP Vertical Turbine Pumps.

1.4.1 Red Rock Visitor’s Center

At the Visitor’s Center, all water is pumped into a 15,000 gallon above ground storage tank. This tank feeds several facilities at the upper Visitor’s Center complex which includes the Visitor’s Center Building, the Red Rock Administration Building, and the adjacent restroom facilities. Because this tank is fed from the wellhead, changing water level within this 15,000 gallon tank controls the two dedicated water distribution pumps supplying it from the Pump Building. Level switches in the 15,000 gallon tank will signal these pumps at the Pump Building to cycle on or off. Specifically, water level in this tank will actuate the appropriate switch whenever it approaches either a predetermined high or low condition.

Subsequently, these switches will send a signal to the Pump Building, telling the variable speed drives controlling the Bell & Gossett pumps to ramp up or slow down/stop in accordance with water demand.

Note that a surge tank is mounted in the water supply line to regulate line pressure as the pumps cycle (one of two blue tanks in Figure 1.3).

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1.4.2 Fee Station

Unlike for the Visitor’s Center, the water distribution pump that supplies the Fee Station is controlled directly from the plumbing fixtures in the building. When faucets are opened and closed, or the toilet is flushed, the change in pressure in the line signals the distribution pump in the Pump Building to start and stop. Like the supply line that feeds the Visitor’s Center, a surge tank is mounted in the line to the Fee Station (the other blue tank in Figure 1.3).

Figure 1.3

2.0 OPERATING THE WATER DISTRIBUTION SYSTEM

This section is a guide on how to operate each major component of the water distribution system.

Where applicable, it describes the positioning of valves, the general operation of pumps, and an overview of the system controls. Refer to each component’s individual O&M manual appended to this document for detailed instructions on how to program, operate, and service the equipment.

2.1 Water Treatment Plant Bypass

Under normal operation, water from the well is initially pumped through the Water Treatment Plant in the Pump Building. Figure 2.1 shows the normal operating configuration of the Water Treatment System Bypass Valves located inside the Pump Building on the east wall. These valves may be manually configured to bypass the water treatment plant. This is done by closing the normally-open, red-handled isolation valves (NO) and opening the normally-closed, red-handled bypass valve (NC) shown in Figure 2.1.

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Figure 2.1

2.2 Chlorinator

The chlorinator (Figure 2.2) meters a sodium hypochlorite solution directly into the well water supply line inside the Pump Building. It is currently calibrated to provide a mixture of 1.5 parts per million. The chlorinator requires periodic monitoring to ensure the supply of disinfectant does not run out. Fill the chlorinator tank using NSF-certified disinfectants only, such as those pictured in Figures 2.3.a and 2.3.b.

When refilling, use a 1:8 ratio of disinfectant to water, in accordance with the equipment manufacturer’s recommendations.

NC

NO NO

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Figure 2.2

Figure 2.3.a Figure 2.3.b

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2.3 Underground Water Storage Tank Valves, Connections, Level Indicators, and Access

2.3.1 Manual Tank Fill, Drain, and Isolation

The Underground Tank is normally filled directly from the wellhead. If the situation requires, this tank may be filled manually via the manual fill hose connection. A water truck may attach a hose directly to the cam-lock manual fill hose connection that is mounted to the combined fill/vent line gooseneck (Figure 2.4).

This Underground Tank is capable of being isolated from the Pump Building and the water distribution system. Likewise, the water inside this tank is also able to be drained out of the tank. Both functions must be performed manually by opening and closing the corresponding valve shown in Figure 2.5. Both valves are appropriately labeled to indicate which one regulates flow to the Pump House (normally open) and which one directs flow out through the drain (normally closed). The valve key to adjust these valves is located inside the Pump Building, hanging on the wall adjacent to the door. Due to the depth at which these valves are buried, the valve key must be fully extended to access both valves.

Figure 2.4 Figure 2.5

2.3.2 Tank Level Control and Alarms

The well pump is controlled by level switches located inside the Underground Storage Tank to ensure it does not run dry nor gets overfilled from the wellhead. In the event the tank runs too low or too high, a visual signal, visible from the visitor center, will alert staff of either situation. This signal will be in the form of one of two signal lights mounted on the top right-hand corner of the Pump House exterior wall facing the Visitor’s Center (Figures 2.6.a and 2.6.b).

• Low Level Alert: The left (red) light will flash in the event the Underground Storage tank is too low/near empty.

• Overflow Alert: The right (yellow) light will flash in the event the Underground Storage tank is overfilled/overflowing.

Manual Fill Hose Connection

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The level switches are accessible from the handhole box mounted directly above the switch insertion point in the tank (Figure 2.7.a). Figure 2.7.b shows the Warwick level switch control inside the handhole. Signal wire from the high- and low-level switches are routed through this box into the Pump Building where they tie into the well pump control panel as well as the Low Level and Overflow Alert lights in Figures 2.6.a and 2.6.b).

Figure 2.6.a Figure 2.6.b

Figure 2.7.a Figure 2.7.b

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2.3.3 Tank Overflow and Maintenance Access

In the event overflow does occur, the tank is protected by an overflow line that directs water onto a riprap-lined ditch to prevent erosion (Figure 2.8 foreground). The end of this line is covered by a flap that opens to allow water to flow out but remains closed to prevent wildlife and debris from entering.

When it becomes necessary for personnel to physically enter the tank to perform maintenance or cleaning, a raised entry access hatch is located next to the overflow (Figure 2.8 background). The hatch is secured by a padlock. Once opened, personnel can climb down into the tank using the built-in fiberglass ladder (Figure 2.9).

WARNING! The Underground Water Storage Tank is a confined space. Only personnel who are trained and equipped for confined space entry may enter, and a trained and equipped confined space monitor outside the tank must be present.

Figure 2.8 Figure 2.9

2.4 Well Pump and Water Distribution Pump Controls

2.4.1 Well Pump Control

The Well Pump Control Panel is located on the west wall of the Pump Building, above the three Water Distribution Pump variable speed drive controllers (Figure 2.10.a). The well pump can be operated either manually or automatically. The default configuration is automatic. As noted in Paragraph 2.3.2 above, the level switches inside the Underground Water Storage Tank will automatically signal the well pump to start and stop in order to maintain adequate water volume inside this tank. These switches may be manually bypassed with the manual toggle switch located inside the Well Pump Control Panel (Figure 2.10.b). When this manual toggle switch is turned “ON” (switch in the UP POSITION), the well pump will run regardless of the water level in the Underground Tank. Under normal operations, ensure the toggle switch is in the “OFF” position (switch in the DOWN POSITION).

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WARNING! If the Manual Toggle Switch controlling the well pump remains “ON”, be aware that the water level in the Underground Water Storage Tank may overflow. Do not leave the well pump system unattended while in manual mode.

Figure 2.10.a Figure 2.10.b

2.4.2 Water Distribution Pump Controls

The Water Distribution Pumps are controlled from the three AQUAVAR CentriPro variable speed drive motor controllers mounted on the west wall of the Pump House (Figure 2.11) beneath the Well Pump and Chlorinator Control Panel. These units enable the operator to run the pump in manual mode (HAND) or automatically according to programmed parameters (AUTO). The control parameters that regulate these pumps are the water demand signal from the Visitor’s Center storage tank as well as pressure in the line. For detailed instructions on how to operate these pumps, refer to the AQUAVAR CentriPro Manual in Appendix A of this Operation & Maintenance Instruction.

WARNING! When the vertical turbine water distribution pumps are operating in manual mode (HAND), they will continue to push water regardless of the pressure in the supply lines. Damage to the water distribution system components such as the pump, piping, valves, control sensors, or other in-line appurtenances may occur at excessive pressure levels. Do not leave the water distribution pumps unattended while in manual mode.

Well Pump & Chlorinator Control Panel (Closed)

Well Pump & Chlorinator Control Panel (Open)

Manual Well Pump Toggle Switch

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Figure 2.11

2.4.2.1 Visitor’s Center Distribution Pump Control

The two Bell & Gossett distribution pumps that supply water from the wellhead to the Visitor’s Center are directly controlled by water level in the 15,000 gallon aboveground storage tank next to the Administration Building. Level switches in that tank send a signal to a Radio Telemetry Control system located in the Administration Building mechanical room. The level switch and telemetry controls are mounted inside the Administration Building mechanical room on the west wall to the left-hand side of the entrance (Figures 2.12.a and 2.12.b). This telemetry system sends a radio signal to the Pump Building next to the wellhead, via the receiver antenna shown on top of the building in Figure 2.6.a. This signal communicates directly with the AQUAVAR CentriPro variable speed drive pump motor controllers to operate the distribution pumps in the Pump Building. Depending on water level in the Visitor’s Center tank, the signal from the Radio Telemetry Control System causes the water distribution pumps to ramp up or slow down/stop.

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Figure 2.12.a

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Figure 2.12.b

2.4.2.2 Fee Station Distribution Pump Control

The distribution pump that supplies water from the wellhead to the Fee Station is directly controlled by the water fixtures in the Fee Station. When a tap is opened or a toilet is flushed at the Fee Station, the pressure change in the supply line to the Fee Station sends a signal via an in-line pressure sensor, like the ones shown in Figure 2.13, causing the water distribution pump motor to ramp up or slow down/stop.

Figure 2.13

Pressure Sensors

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2.5 Air Conditioning and Ventilation

The wall-mounted air conditioner and the ventilation fan/louvers are controlled by the small panel on the northwest wall of the Pump Building, mounted in between the entry door and the main breaker panel for the building (Figure 2.14). The air conditioner and fan/louvers may be programmed for automatic operation, or for manual operation. Refer to the O&M manual in the Appendices for details on how to operate this system.

Figure 2.14

3.0 OPERATING THE WATER TREATMENT PLANT

This section is a guide on how to operate each major component of the Water Treatment Plant. Where applicable, it describes the positioning of valves, the general operation of pumps, and an overview of the system controls. Refer to the Hanson’s Water Treatment manual attached to the end of this document for detailed instructions on how to program, operate, and service the equipment as well as for a specific point of contact who designed the treatment system.

3.1 System Supplier and Point of Contact

The Water Treatment Plant was sized and supplied by:

Hanson’s Commercial Water Treatment 4345 Wagon Trail Avenue Las Vegas, NV 89118 Office Phone: (702) 364-4550

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Fax: (702) 368-1801 Point of Contact: Rick Wallace, System Engineer Industrial Water Treatment Email: rick@hansonwater.com Cell: (702) 821-6955

A complete manual for all the major system components is attached to this Operations and Maintenance Manual. Refer to this manual for detailed O&M instructions for each Water Treatment system component.

3.2 General Information

3.2.1 Water Filtration Media

The active ingredient for the treatment of raw well water is the KATALOX LIGHT Advanced Filtration Media. This material is added to each fiberglass treatment vessel in accordance with the supplied Hanson’s O&M Manual. KATALOX Light is ANSI/NSF-61 Certified for drinking water applications and has met the ANSI/NSF 372 lead-free compliance standard.

When changing the media, use KATALOX LIGHT Advanced Filtration Media or an approved equal.

3.2.2 Fiberglass Treatment Tanks

The treatments tanks are a pair of 20 cubic foot, 36-inch diameter by 72-inch-tall fiberglass vessels mounted in parallel (Figure 3.1) along the northeast wall inside the Pump Building. These tanks contain the filtration media and actively filter raw well water after it is initially pumped from the wellhead into the Pump Building. Filtered water is metered from each tank to the Underground Water Storage Tank via a top-mounted Fleck 2900S Control Valve. Since the tanks are mounted in parallel, each tank can be manually isolated by closing a pair of isolation valves mounted in the inlet and outlet lines above the tank. This allows for servicing or removal without impacting the overall operation of the water treatment system.

Service each Fiberglass Treatment Tank in accordance with the manufacturer’s instructions.

mailto:rick@hansonwater.com

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Figure 3.1

3.2.3 Treatment System Control Valves

The Fleck 2900S Control Valve is manufactured by Pentair (Figure 3.2). It is mounted on top of each treatment tank. Although the control valve is capable of 106 GPM continuous service flow with a backwash of 36 GPM, it’s flow rate is actually limited by the well pump’s capacity, which is approximately 11 GPM. Therefore, the Fleck 2900S will continuously cycle on and off metering water from the treatment tanks to the Underground Water Storage Tank as long as the well pump continues to produce water and gradually fills the fiberglass treatment vessels. Water regeneration cycles can be programmed using the control valve’s built-in timer.

Refer to the Fleck 2900S manual included with the attached Hanson’s literature for detailed instructions on programming and servicing the control valve.

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Figure 3.2

4.0 APPENDICES

These appendices include detailed O&M literature for the major system components in the Water Distribution System and the Water Treatment Plant.

A. Red Rock Conservation Area Water System Operation and

Maintenance Manuals

Tab 1: Bard – One TON Air Conditioner Tab 2: Series VTP – Vertical Turbine Pumps Tab 3: Aquavar Intelligent Pump Controller Tab 4: Aquavar – Start Up Genie Programming Manual Tab 5: Aquavar – IPC Application Guide Tab 6: WCI Warranty

B. Hanson’s WaterTreatment O&M Manuals & Warranty

Tab: FLECK 2900S Tab: Fiberglass Tanks Tab: KATALOX MEDIA Tab: WARRANTY

C. Warranty Management Plan: BLM Red Rock Visitors Center Water

Supply Well

2.5 Air Conditioning and Ventilation