TE_27_WaterWastewater.docx

Water and Wastewater Emergency Plans

1. The contractor shall use the procedures contained in this technical exhibit (TE) as a minimum guidance in how to respond to a water and/or wastewater emergency situation in conjunction with DPW personnel.

2. The contractor shall establish additional procedures, as required, to ensure the safety of personnel and property IAW Federal, State, and local Regulations.

Base Operations (BASOPS) Performance Work Statement Technical Exhibit 27 – Water and Wastewater

WATER AND WASTEWATER EMERGENCY PROCEDURE PLANS FOR

DIRECTORATE OF INSTALLATION SUPPORT FORT HUACHUCA, AZ

EMERGENCY POWER/WATER REPLENISHMENT PLAN

1. Mission: To prescribe responsibilities and actions to be taken in the event commercial electrical power is not available or limited in availability as the result of natural or man-made disasters, fuel shortages, or equipment malfunctions.

2. General:

a. Power Reductions and Outages. Complete or partial non-availability of commercial power to Fort Huachuca can result from a number of causes, to include:

(1) Man-made or natural disasters effecting the Tucson Electric Power Company (TEPCO) power plant located in Tucson, or the TEPCO power line between Tucson and Fort Huachuca.

(2) Disruption of the power transmission lines between the post power station and the water production system to include all wells and booster stations.

(3) "Brownouts" or "blackouts" when TEPCO may be unable to supply sufficient power to support consumption fully. This can result from fuel constraints, unanticipated high usage by other TEPCO customers, or unanticipated increases in consumption beyond Fort Huachuca's load limits.

(4). Impact of Water Usage. Water conservation is essential to energy conservation at Fort Huachuca. A major factor in power consumption at Fort Huachuca is that tanks are filled using electrically powered pumps. Water conservation measures are therefore also intended to reduce power consumption.

(5). Impact of treatment of wastewater. The treatment of wastewater is essential to reduce the effects of sewage on the public health, and to meet regulatory criteria from state and federal agencies.

3. Directorate of Public Works Responsibilities:

a. The Director is responsible for implementing emergency plan procedures and assigning responsibilities to Division Chiefs to include:

(1) Developing internal procedures documenting responsibilities and actions to be taken during power reductions or outages that will affect water production systems and wastewater treatment systems.

(2) Supervision of all areas, for which he or she is responsible, to assure maximum conservation of electricity and water.

(3) Informally coordinating with other agencies, as required, the reason for the power outage; and consequently the water outage, and designation of areas where water is available. Prioritizing requirements for scheduled non-emergency procedures, based on utilities available.

(4) Advising the Chief, Operations and Maintenance Division, of additional electrical power support in case of total or partial power outage that will affect the pumping systems capability to maintain a safe level of water capacity for domestic, fire-fighting, and treatment of sewage use.

(5) Advising the next echelon of supervision of agencies or activities, on interruption or reduction of water use because of power failure, and to notify of alternate measures taken to provide water to the post.

b. In case of a total power outage the Chief, Operations and Maintenance Division, is responsible for:

(1) Overall coordination of utilities requirements and staff responsibility for recommending actions to be taken throughout the DPW pertaining to utilities use.

(2) Advising the Director of the requirements to obtain alternate power supply to power the water pumping stations and wastewater treatment equipment.

(3) Advising the Director of the requirements to curtail electrical power to designated areas to maintain water pumping systems and wastewater treatment equipment.

(4) Coordinate with other agencies, as required, for availability of portable generators.

(5) Coordinate with other units and/or major commands to determine availability of power generation equipment.

(6) Coordinate with Directorate of Contracting to expedite “compelling emergency" supply, service, and procurement requests.

(7) Coordinate with other units, agencies, and/or major commands, as required, for availability of equipment to haul, distribute and dispense water to designated areas.

(8) Coordinate with the DPW service contractor to: wire and operate borrowed power equipment to the designated water facilities, and for operation of borrowed water hauling equipment, through a valid work document.

(9) Coordinate with the DPW service contractor to

(a) Secure water lines that will feed water from the activated wells and booster stations to the water reservoirs, and to isolate areas that are not critical, and

(b) Operate wastewater treatment system with 2 ea. power generators that are on location in the event of a power outage.

(10) Have in the Contract Management Division a set of maps for the water system with water routings and proposed water wells identified for emergency use.

(11) Serve as point of contact for additional emergencies related to power shortage or outage.

(12) Coordinating the termination of the use of emergency power and restoration of regular electrical power.

c. In case of a partial power outage, the Chief, Operations and Maintenance Division, is responsible for:

(1) Overall coordination of utility requirements and staff responsibility for recommending actions to be taken throughout the DPW pertaining to utilities use.

(2) Advising the Director of requirements to curtail specific functions or services to post areas to maximize availability of power to water production systems, wastewater treatment systems, and other critical services.

(3) Maintain liaison with facilities that have emergency power supplies, to monitor total loads on auxiliary generators and available power remaining.

(4) Plan the redistribution of electrical power to the water pumping and wastewater treatment systems in the event that the primary means of transmission are inoperative.

(5) Assuring full electrical power to the designated areas of the water pumping and wastewater treatment systems in the event of power reductions. Maintenance of full power to water pumping stations and wastewater treatment equipment receives highest priority of support.

(6) Coordinate selective reconnections to preclude restart overloads.

(7) Serve as point of contact for other emergencies related to partial power outage.

(8) Recommend modifications of the existing utilities systems which will alleviate future power problems.

4. Procedures: In the event of a total or partial electrical power outage, which may disrupt the potable water service to Fort Huachuca, initial backup sources have been addressed for potable water requirements in pages 2 and 3. Initial backup sources for fire-fighting will be utilized from water reserves located throughout the post area. The fire department will utilize these sources with the aid of pumping and transporting equipment. Information in this list includes location with building number or general area. Distances are included and calculated from the cantonment area. Dimensions are given in gallons and acre/feet of water.

5. This plan will be revised once per year.

POWER EQUIPMENT WASTE WATER TREATMENT PLANT

Blower Motor (Pacer)

EMERGENCY WATER PLAN

1. Mission: To establish procedures to be implemented in the event of: partial or total water contamination where normal water supplies are reduced or interrupted, to Fort Huachuca, and to provide procedures to transport, purify, and provide potable water to designated critical areas where contamination has been determined.

a. Phase I. To develop a plan to assess the type and extent of contamination, to secure water supplies, and minimize contamination

b. Phase II. Testing and purification of contaminated water; making the water potable.

c. Phase III. To acquire water from emergency water sources.

d. Phase IV. The acquisition of water tanker vehicles (1000 and 5000 gallons) to transport potable water to designated areas

e. Phase V. Fire Department will pump potable water, via their pumping system, through the fire hydrants adjacent to critical buildings that have not been determined as contaminated facilities and have been isolated from the water distribution system.

f. Phase VI. To review plan on a yearly basis, to update and add new information that will increase the success of the implementation of this plan.

2. Scope: The provisions of this plan applies to all activities, divisions, and departments of the Directorate of Public Works of Fort Huachuca.

3. Directorate of Public Works responsibilities:

a. The Director is responsible for implementing emergency plan procedures and assigning responsibilities to Division Chiefs to include:

(1) Developing internal procedures documenting responsibilities and actions to be taken in the event a partial or total contamination of the water supply occurs.

(2) Supervision of all areas, for which he or she is responsible, to prevent contamination and to assure maximum conservation of water.

(3) Informally coordinating with other agencies, as required, the type and extent of water contamination and provide information on alternate sources and distribution points of potable water.

(4) Advising the Environmental Division Chief of coordinating with MEDDAC's Preventive Medicine Service Section, for sampling and analyzing of water to determine the type and extent of contamination.

(5) Advising the Chief, Operations and Maintenance Division, of coordinating security of water systems by: isolating major water reserves and areas to minimize contamination of the potable water system, and the procurement of water transportation and dispensing equipment.

b. When a report of contamination of the potable water system has been determined, the Environmental Division Chief is responsible for:

(1) Overall coordination of water sampling and analysis in conjunction with the Environmental Officer, Preventive Medicine Service, MEDDAC, to assay water to verify contamination and type of contaminant.

(2) Advising the Director of requirements to secure the water system partially, or have a total shutdown of the system post wide, based on the information received from the water sampling and analysis.

(3) Coordinate with the Chief, Operations and Maintenance Division, to secure the potable water system in all areas where contamination is suspected and to provide alternate sources of potable water.

(4) Coordinate with other agencies, as required, to inform them of results and alternate sources for obtaining water.

(5) Coordinate with the Housing Authority to notify occupants of discontinuation of water use and to inform occupants of alternate water sources.

(6) Coordinate procedures to decontaminate the potable water system with the appropriate agencies to include: the Arizona Department of Environmental Quality and the local Environmental Protection Agency authority.

(7) Serve as a point of contact for additional emergencies related to water contamination.

b. When a report of contamination of the water system is determined, the Chief, Operations and Maintenance Division is responsible for:

(1) Overall coordination of utilities requirements and staff for: recommending actions to be taken throughout the DPW pertaining to water contamination and to suggest solutions to the problem.

(2) Advising the Director of requirements for alternate sources of potable water.

(3) Coordinate with other units, agencies, or major commands for availability of water transporting and dispensing equipment

(4) Coordinate with other agencies to obtain water decontaminating equipment.

(5) Coordinate the restoration of the water system after decontamination takes place.

(6) Coordinate with Directorate of Contracting to “expedite “compelling emergency" supply, service, and procurement requests.

(7) Coordinate with DPW service contractor to: mobilize water transporting and dispensing equipment, secure the potable water system, or isolate designated areas through a valid work document.

4. Procedures: In the event of a total contamination of the potable water distribution system; which may disrupt potable water services to support Fort Huachuca, initial backup sources for potable water, if not contaminated, will be utilized.

The total amount of potable water reserve on Fort Huachuca is:

(1) Three million gallon reservoir.

(2) One and one-half million gallon reservoir.

(3) Old Post reservoirs - 450,000 gallons.

(4) Elevated tank - 500,000 gallons.

(5) Six surge tanks (50,000 gallons each) - 300,000 gallons.

(6) East Range holding tank - 100,000 gallons.

(7) West Range tank – Canelo/W. Hemp – 120,000 gallons.

(8) Black Tower tank – Black Tower – 10,000 gallons.

Total: 5,530,000 gallons

This potable water reserve is contained in different types of structures such as: ground level reservoirs, steel holding tanks, surge tanks (located at each water well), high altitude steel tanks, and concrete tanks with piping systems. If these facilities are secure in time to prevent contamination, they could be used as emergency water sources as soon as connections are devised. Water will be transported to the post areas by the available vehicles (1000 and 5000 gallon water tankers) provided by the Directorate of Public Works. Water sources have been identified.

In the event that potable water must be transported to the hospital, a fire engine will also be tasked, to provide pumping capabilities of water into the hospital. The fire truck can also connect to fire hydrants adjacent to the hospital, which allows direct access to the hospital water supply. The engine pumping capabilities are approximately 1,000 gallons/minute of potable water.

5. This plan will be revised every year.

POWER EQUIPMENT WATER TREATMENT PLANT

MTRS

HP

Station

Prepared 09/28/18 5-16-2-10

Rucker St Booster

62500 NO 480 OK 4 50

Water Production, Treatment, Storage, Equipment, and Distribution Equipment List

Recurring Maintenance Frequency

Facility # and Equipment

Manufacturer

Frequency

Well #1, Bldg. #90017: Pump

Flowway

D, W, Q

Booster 1A, Bldg. #90016: Pump, Booster - #1

United Iron Works

D, W, Q

Surge Tank, 50,000 gal

D

Well #2, Bldg. #90013: Pump

Winthroath

D, W, Q

Booster 2A, Bldg. #90014: Booster, 2A Auto-Centrifugal

Bingham-Williamette

D, W, M, Q

Surge Tank, 50,000 gal

D

Level Sensor

D

Water Plant for Well #1 and Well #2, Bldg. #90015 (Chemical Building):

Saturator Tank, 50 gal capacity

M

Prepared 9/28/2018 T-5-16-3-1

Well #3, Bldg. #90431: Pumps, Lineshaft Deep Well

Worthington

D, W, Q

Motors Booster Pump Fluoridator Motor Starter and Control Panel U.S. Motors

Square D D, W, Q D, W, Q D, W, Q D

Saturator Tank, 50 gal capacity

M

Surge Tank, 50,000 gal capacity

D

Level Sensor

D

Well #4, Bldg. #90672: Pumps, Lineshaft Deep Well

Pamona

D, W, Q

Saturator Tank, 50 gal capacity

M

Surge Tank, 50,000 gal capacity

D

Level Sensor

D

Well #5, Bldg. #90860: Pumps, Lineshaft Deep Well

Worthington

D, W, Q

Saturator Tank, 50 gal capacity

M

Surge Tank, 50,000 gal capacity

D

Chlorinator Level Sensor

D

Well #6, Bldg. #79692:

Saturator Tank, 50 gal capacity

M

Bldg. #79696

Surge Tank, 50,000 gal capacity

D

Level Sensor

D

Well #7, Facility #PUZPW1-HW:

Well #8, Facility #PUZPW1-1IW:

One and a Half Million Gallon Reservoir Booster Pump, Bldg. #22024:

Wherry Booster Station, Bldg. #62500:

Irwin Street Booster Station, Bldg. #53401: Booster, #B1

Westinghouse

D, W, Q

D, W, Q

Kino Springs Reservoir, Facility #11515: Motor

Aurora

D, W, Q

Blacktail Canyon, Bldg. #12508: Motor Starter and Control Panel

Autocon System Control Co.

D

Tank, Pressure, 10,000 gal capacity

D

Level Indicator Target

D

Parachute Building Reservoir Tank, Sycamore Canyon:

Tank, 10,000 gal capacity D

Sand Trap #1, Bldg. #13324:

East Range Spatial Resolution, Bldg. #15690:

Garden Canyon Water Systems, Facility #PUZPW1:

Motor, Well Pump, Submersible Franklin Electric D East Range Test Sensor, REMBASS Well, Bldg. #15663:Pump, Submersible Franklin D Motor, Starter and Control Panel Furnas D Tank, Pressure, 120 gal capacity

D

East Range REMBASS Sensor Implantation Site, Bldg. #16502:

Bunker, Bldg. #18752:

Pump Motor, Submersible Fairbanks-Morse D

Old Post Chlorinator, Bldg. #22003:

Chlorine Sensor

*OFFLINE*

Capital D

Elevated Water Tank, Bldg. #49001:

Three Million Gallon Reservoir, Bldg. #61609:

Level Transmeter Bristols D

Irwin Street Swimming Pool, Bldg.

#70563:

Filters, replace filter sand(2)

D, A (or as need be on

RM)

Facility # and Equipment Manufacturer Frequency

Barnes Field House Swimming Pool Bldg. #61701:

with Float Control (2), replace Diatomite Cartridges

D, AN ( done on RM)

Reservoirs:

Bldg. #61609:

Bldg. #22020:

Bldg. #22001:

Bldg. #22002:

Waterous M & H Kennedy Iowa

Water Production, Treatment, and Storage Production

1. System Description - Hydraulic

a. The potable water supply for Fort Huachuca is supplied by eight deep groundwater wells located in a dispersed manner throughout the main post area. The total pump capacity is rated at 5,810 gallons per minute (gpm) or 8.4 MGD). Additional data is available upon request.

b. Each well is housed in a wooden pump house with concrete floors. Wells No. 1 through 6 feed directly into two 50,000 gallon surge tanks located at each well site. Wells No. 7 and 8 pump jointly to a 100,000 gallon surge tank facility. Wells No. 1 through 6 are controlled by float switches located in the surge tank. As the surge tank level drops, the switch electronically triggers the pump operation. Wells No. 7 and 8 are controlled manually no communication from surge tank to Well #7 or Well #8.

c. From the surge tanks booster pumps are utilized to feed either the distribution system or fill the storage facilities. Pumps No. 1, 2A, 3, 4, 5 and 6 discharge to the system while, Booster Pumps 2B and East Range Boosters 1, 2 and 3 discharge to storage. Flow and valve schematics are given in Figure 3-2. Current storage capacity totals 5.55 MG (including surge tanks) according to the specifications listed in Table 3-2.

d. Flow data from Wells No. 1 through 6 are calculated monthly using recorded pump hours and rated pump capacities. Wells No. 7 and 8 are programmed to be computer activated and measured; however, the system is not currently in-use. From the storage facilities, distribution to the system is through 6 inch to 16 inch diameter cast iron and steel and transite mains. System pressure within the distribution network is maintained at 65 to 70 pounds per square inch (psi) with four in-line distribution booster pumping stations.

e. The ages of the various components of the system vary widely. Some distribution mains and storage facilities are 60 years old and more. Some facilities have been constructed in the last 10 years.

f. Additional water supply could be obtained on an emergency basis from a spring located in Huachuca Canyon near the old post of Fort Huachuca. The estimated capacity from this alternate source is 400 gpm. No interconnection currently exists with the surrounding community of Sierra Vista.

1.1 System Description - Treatment

a. Potable water treatment at Fort Huachuca consists of chlorination and fluoridation.

1.1.1 Chlorination

Individual chlorination facilities are located adjacent to all wells except Nos. 7 and 8, where the facilities are located adjacent to the storage facilities. Chlorine is provided by twin 150 pound cylinders connected by manifold to a vacuum type, V-notch chlorinator. The chlorine is injected on the suction side of the booster pumps. Chlorine usage is measured by scales at all facilities. Storage space for spare cylinders is provided at each site.

1.1.2 Fluoridation

Individual fluoridation facilities are located at each well site with the exception of Wells No. 7 and 8. For these wells, the facilities are located within the storage facility of the booster pump station. Fluoride is fed into the raw water line prior to the surge tanks at Wells No. 1 through 6, while at Wells No. 7 and 8 the fluoride is fed prior to the booster pumps. A 4 percent feed of sodium fluoride solution is used with an automatic, water operated, meter-paced unit. The solution tank is protected from the supply line by an air gap in the tank. Feed rates and dosage rates were not available; however, a 0.8 to 1.0 mg/L fluoride residual goal was stated.

TABLE 3-2

WATER STORAGE TANKS

11663

Fire Suppression Black Tower

Sewage Treatment Plant TREATMENT PLANT COMPONENTS

A. PLAN - GENERAL FUNCTIONAL DESCRIPTION:

1. The treatment plant is classed basically as a physical process plant, with Orbal aeration disk filter classed as a physical/biological treatment component. There are no chemical additions for process enhancement. Chlorine is applied in the influent to the tertiary filter only for algae control, disinfection, and sulfur dioxide DE chlorinates the filter effluent to prevent THM formation.

2. It is the intent of the Fort to maximize to the greatest extent the re-use of the plant effluent, thus reducing the demand for ground water. To this end, the treatment process results in the discharge of effluent which meets all applicable standards for re-use.

3. The bio solids which are accumulated (screenings, grit, scum, dried sludge, and miscellaneous solids from cleanings, all are treated and monitored to assure their non-toxic condition and disposed of, off the Post, in an approved landfill.

4. The subsequent section of this chapter provides the Basis of Design and general functional details of each Treatment Plant component.

B. HEADWORKS:

All components included in the Headworks are identified, design and operational details are provided in the following sub-sections.

1. Screw Conveyor, Manual Bar Screen, and Channels:

a. Function is to remove coarse inorganic material, including rocks, rags, sticks, heavy trash.

Basis of Design: Hydraulic Capacity -

7.2 MGD

Bar Size - 3/8" x 2-1/2"; 3/4" spacing

b. Manual Bar Screen is used only when Screw Conveyor is shut down for repair or maintenance, and screenings from Manual Bar Screen are manually raked and deposited in dumpster all inorganic materials must not be allowed to get past the bar screen (Augur Monster) and get to the Oxidation Ditch. Traveling Bar Screen automatically discharges screenings into dumpster. It is actuated by (1) differential across screen, (2) program timer, or (3) high-level float. All screenings are disposed of at landfill.

2. Grit Chambers Nos. 1 and 2:

a. Function is to provide for settling of heavy inorganic matter, such as sand and rocks, which has passed the bar screens.

45 cu. ft. grit

b. Grit settles in grit hopper with the highest concentration normally at each end of the hopper. Vacuum truck is used to remove grit from grit chamber during normal operation, one grit chamber is in operation for a day, then is shut down for cleaning, while the second is in operation. During peak flows, both units are in service. All grit is disposed of at drying beds. At no time will any grit be permitted to enter the oxidation ditch. If and abundant amount of grit is in the waste stream the contractor will adjust the operation of the grit chambers to ensure the chambers are not full of grit at any time.

3. Parshall Flume and Flow Sensor/Indicator/Transmitter:

Function is to measure treatment plant influent wastewater volume, provide local indication, and transmit flow signal for control of motorized slide gates at the grit chambers, and the influent flow recorder.

4. Recirculated Waste Stream Inlets:

a. Function is to provide for waste streams from various in-plant locations to be recirculated through the treatment plant, with the solids contained in the liquid stream becoming a part of the primary sludge. Waste streams are:

(1) Oxidation Ditch

(2) Sludge Press Over Flow (Filtrate)

(3) Clarifier Sludge (RAS/WAS)

(4) Tertiary Filter Backwash

(5) Common Discharges from Deep Well Pump Stations Nos. 1 and 2

(6) Digester Supernatant

(7) Sludge Drying Beds (Decant)

(8) Equalization Basin Sludge

Basis of Design: Waste streams discharged into Headworks Channel must be downstream from Parshall Flume to prevent incorrect influent flow measurement, and upstream from the Shredder/Grinder to provide thorough mixing with main waste stream.

b. The frequency and rate of flow of discharges to the Headworks from digester supernatant and from draining operations of the equalization basins, oxidation ditch and clarifiers are manually controlled. To assure that back-flooding of the Parshall Flume does not occur, these must be scheduled to not occur simultaneously.

5. Shredder/Grinder, Bypass Bar Screen, Channels:

a. Function is to macerate all organic and inorganic material which has passed the bar screens and grit chambers.

b. Bypass Bar Screen is used only when Shredder/Grinder is shut down for repair or maintenance. Screenings from Bypass Bar Screen manually raked and disposed of at landfill.

6. Flow Control/Splitter Box No. 1:

a. Function is to divide the total wastewater stream into individual streams discharging to the Oxidation Ditch and to the Equalization Basins in service at any given time. The flow division is accomplished automatically by means of the control structures, and the flow volume directed to each basin is in direct proportion to the relative capacities of basins in service. The possible scenarios are identified in Table 6.

TABLE 6 – FLOW PROPORTIONS TO EQUALIZATION BASINS

b. The design and construction of Splitter Box No. 1 includes a fourth control structure with high and low inlet piping streams that discharges influent water to the oxidation ditch treatment train.

C. EQUALIZATION BASINS:

Equalization Basins provide the first phase of inorganic pollutant removal by the treatment facility during extreme high flow. The same design standards apply to all three units and the operating results will be comparable.

1. Settling Basins, Grit Collectors, Scum & P.O.L Removal:

Function is to provide adequate time for grit solids (inorganic) settling and P.O.L. removal. Convey the influent water back to the headworks for processing. The manually rotated scum/P.O.L trough decants surface scum & P.O.L and flushing water and discharges to the scum chamber.

2. Pump Station No. 1:

Function is to provide capability to drain any of the three (3) Equalization Basins on a periodic as-needed basis. Collects flow from Equalization Basin Chambers. Two (2) pumps are installed and discharged through a common line to the Headworks.

“Lead-Lag” function

D. OXIDATION DITCH AND CONTROL STRUCTURES:

The filter units and the structures which are integral to its operation are identified, and a brief description are provided in the following sub-sections.

1. Oxidation Ditch:

Function is to serve as a Biological reactor to provide a degree of organic removal in the wastewater stream as it contacts and flows through the Aeration Chambers and Disks.

Wastewater from the Influent Box is distributed in the outer chamber of the Oxidation ditch, at no time shall any inorganic material be allowed to infiltrate the oxidation ditch, provisions will be made to ensure all inorganic materials are removed from the system. The outer chamber is maintained with a DO level of zero (0) by the use of Aeration Disks, the wastewater flows through to the next chamber where the DO level is maintained at a 2+ by the use of Aeration Disks, the wastewater flow continues through another chamber then is gravity fed to Recirculation Well/Splitter Box No. 2.

2. Junction Box No. 1:

Function is to serve as a collection chamber for the effluent from the Primary Clarifiers/EQ Basins and to discharge the combined flow to the Influent Box. Slide gates in the structure and a by-pass line extending from this structure to Splitter Box No. 2 The capability to take the bio reactor and ox ditch out of service for maintenance and/or repair cannot be done.

3. Influent Box/Trickle Filter: *OFFLINE*

a. Function during operation is to serve as a receiving/mixing chamber for equalization basins effluent from Junction Box No. 1 and recirculated the recirculation well.

b. During the infrequent occasions when any one of the Effluent Holding Ponds must be drained, the effluent is discharged from the indicated drain line into the Influent Box, thence through the treatment train for re-treatment and disposal.

4. Recirculation Well/Splitter Box No. 2:

Function is to collect the Oxidation Ditch effluent wastewater stream in the recirculation pump chamber and to deliver the overflow by means of slide gates with calibrated weirs to each clarifier in direct proportion to the relative capacities of the two clarifiers. A third gate with a solid plate is provided to supply effluent to a potential future clarifier. This structure provides mounting for the two effluent recirculation pumps.

5. Recirculation Pumps, Flow Indicator/Transmitter: *OFFLINE*

Recirculation pumps were used with the trickle filter, they pumped water from the splitter box to the influent box for the trickle filter.

E. CLARIFIERS:

Clarifiers provide a continuing retention and settling process, this also includes the polymer system for the wastewater stream flowing to the circular clarifier tanks from Splitter Box No. 2. The same design standards apply to the two (2) units and the operating results will be comparable. All components are identified and located on Figure II-5 for Clarifier No. 1 and on Figure II-6 for Clarifier No. 2, and details are provided in the following sub-sections.

1. Retention Tanks and Sludge Collection System:

Function is to provide adequate retention in a quiescent zone to assure solids settling, and with rotating rake arms fitted with scrapers and squeegees, to move the settled solids to the RAS/WAS sludge basin. Sludge is pumped for continued processing to the oxidation ditch or disposed of to the dewatering sludge press. Clarifier effluent is discharged to the Final Treatment Works.

2. Sludge Pumping Stations (R.A.S./W.A.S):

R.A.S. pump function is to convey settled sludge on a continual flow to the Oxidation Ditch. Flow will be determined by samples analyses as required in Chapter IV. W.A.S. pump function is at periodic intervals waste sludge to the dewatering sludge press, intervals of waste will be determined by sample analyses as required in Chapter IV.

3. Pump Station No. 2:

Function is to provide capability to drain either of the clarifiers on a periodic as-needed basis. A single pump is installed and discharges is to the Headworks. The pump is similar to those installed in Pump Station No. 1, and in emergency situations, one pump from Pump Station No. 1 can be moved to Pump Station No. 2.

F. FINAL TREATMENT WORKS:

The combined effluent flow from Clarifiers Nos. 1 and 2 enters the Final Treatment Works where the wastewater stream receives the enhanced treatment required to produce effluent quality which is in conformance with all state and federal regulatory agency standards. All components included in the Final Treatment Works are identified and located on Figure II-7 and Figure II-8. Details are provided in the following sub-sections.

1. Parshall Flume and Sensor/Indicator/Transmitter:

Function is to measure Final Treatment Works influent volume, provide local indication, and transmit flow signal for control of motorized slide gates, chlorination, sulfur dioxide, and UV equipment, and to readout.

Basis of Design: Hydraulic Capacity 0 - 8.0 MGD

2. Chlorination Channel:

Function is to provide chlorine solution diffusion and mixing in Final Treatment Works influent wastewater stream and distributing flow to chlorine contact chambers in service.

Basis of Design: Horizontal Cross-channel diffuser and 20 - 40 seconds of mixing time; slide gate control of flow split to contact chambers.

3. Chlorine Contact Chambers:

Function is to provide retention time to stabilize chlorine residual in traveling bridge tertiary filter influent for algae control and microorganism destruction in filter media.

Basis of Design: Vertical end around baffles in chamber for serpentine flow; 1 - 2 minutes retention time. A contact chamber precedes each filter.

4. Traveling Bridge Tertiary Filters:

a. Function is for a final stage removal of BOD5, TSS and turbidity, and to serve as a polishing media for the clarifiers effluent to assure efficiency by the UV system.

3.6 MGD PWWF

Backwash Automatic control by sensors, monitoring head loss through filters

b. Filter backwash flows into the backwash disposal well and is pumped to the Headworks.

5. Filter Backwash Pump Station:

Function is to discharge Traveling Bridge Tertiary Filter backwash waste stream from filter backwash well, common to both filters, to the Headworks. Two (2) pumps are installed with alternating lead lag controls. A line under the effluent channel interconnects the two (2) backwash chambers.

6. Dechlor Chamber:

a. Function is to provide diffusion and retention of sulfur dioxide solution to remove chlorine residual remaining in the tertiary filter effluent stream. Two (2) chemical feeder pumps mounted at the Dechlor Chamber influent provide the water supply for the chlorine and sulfur dioxide feeders and for the effluent monitoring equipment. Two (2) sample pumps mounted at the Dechlor Chamber effluent deliver sample water to the Chlorine Analyzer/Controller and SO2 mixers.

b. All Dechlor Chamber effluent volume to a maximum of 4.0 MGD flow rate discharges into the UV channel. Flows exceeding 4.0 MGD rate overflow the calibrated weir and are discharged into the East Range Outfall Sewer.

7. UV Disinfection System:

a. Function is to disinfect the Dechlor Basin effluent stream by destroying pathogens and coliform bacteria with exposure to ultraviolet radiation from low pressure mercury lamps.

Basis of Design: UV module lamps sufficient to produce an effluent containing no pathogens and no more than 25 cfu/100 ml of fecal coliform in a mean of five (5) samples and no more than 75 cfu/100 ml in a single sample.

b. All disinfected effluent flows into the Effluent Pump Station.

8. Effluent Pump Station:

a. Function is to discharge filtered and disinfected effluent to the Effluent Holding Ponds for subsequent turf grass irrigation and provide effluent to all wash down stations and the dewatering belt filter press. Three (3) pumps are installed. Three pumps are provided to discharge effluent water to the holding ponds. A propeller type flow meter installed in the pump discharge line provides local flow indication and totalizing and transmits flow signal for readout.

b. Effluent not pumped to the Effluent Holding Ponds overflows into the East Range Recharge Basins.

c. During the infrequent occasions when any one of the Effluent Holding Ponds is being drained into the Influent Box, the pumps are not operating.

9. Effluent Outfall Sewer Mounting Ring and Sensor/Transmitter:

Function is to measure the combined flow of disinfected effluent being discharged to the East Range Recharge Basins.

10. Chlorination System:

a. Function is to control algae and microorganism destruction in the Final Treatment Works structures and in the Traveling Bridge Tertiary Filter Media. Two (2) complete sets of equipment are installed to provide standby service.

frequency and duration.

b. Water supply to operate equipment supplied by Submersible Pumps installed at Dechlor Chamber Influent.

11. Sulfur Dioxide System:

a. Function is to apply sulfur dioxide solution in the Dechlor Chamber to neutralize (destroy) any free chlorine residual which may remain in the Traveling Bridge Tertiary Filter Effluent. Two (2) complete sets of sulfur dioxide feed equipment are installed to provide standby service and one Dechlor Analyzer/Controller is installed.

Basis of Design:

Sulfur Dioxide Feeder Capacity Dechlor Analyzer/Controller

15 -150 lbs/24 hours each

0 - 5 ppm residual

Operation Continuous operation with chemical feed rate increased or decreased in accordance with free chlorine residual present in sample. Chemical feed rate is further modulated by proportional control from Final Treatment Works Influent Meter.

b. Water supply to operate the sulfur dioxide feeders supplied by SO 2 Mixers installed at Dechlor Chamber influent. Sample water to the Dechlor Analyzer/Controller supplied by Sample Pumps installed in the Dechlor Chamber effluent.

12. Effluent Monitoring System:

a. Function is to perform a continuous analysis of the concentration of pH, nitrate, and turbidity present in the waste stream discharged from the Traveling Bridge Tertiary Filters.

Nitrates 0 - 50 mg/l

Turbidity 0 - 20 NTU

Remote recording

Transmitter Signal Compatible with control system influent.

G. BIOSOLIDS MANAGEMENT:

All solids which are concentrated in the R.A.S/W.A.S. sludge basins, constitute the material generated by the treatment process which must be stabilized for volume reduction and disposal. This will result in a product for which ultimate disposal can safely be provided at a landfill.

1. R.A.S/W.A.S Sludge Pumps and Meter/Indicator/Transmitter:

Function is to convey settled solids Clarifiers to the Oxidation Ditch or the Dewatering Sludge Press. During normal operation, the piping and valving matches each of the four pumps. A flow meter indicator/transmitter are installed in the common discharge lines to the Oxidation Ditch and the Dewatering Sludge press.

Flow Meter/Indicator Transmitter Signal 550 gpm each Controlled periodic operation (AFD) 0 - 3000 gpm Compatible with control system

Flow Meter/Indicator Transmitter Signal 1000 gpm each Controlled periodic operation (AFD) 0 - 3000 gpm Compatible with control system

2. Dewatering Sludge Press & Polymer Systems:

a. Function is to stabilize the sludge with the use of a polymer coagulant to (a) reduce sludge volume, (b) provide dewatering of sludge. Two (2) W.A.S pumps are provided, but only one (1) circulation pump can be operated at a given time due to the sludge press operation of only 75 to 100 gpm of W.A.S flow. The current biosolids management provides the following sequence of operation:

(1) W.A.S. Sludge is pumped from R.A.S and W.A.S pit.

(2) Sludge is circulated by the W.A.S. Sludge Circulating Pump and sludge flow is maintained at 75 to 100 gpm.

(3) Polymer is introduced in the flow stream of the W.A.S.

(4) W.A.S and polymer are sent through the sludge press for dewatering. Dewatered sludge is conveyed to a roll off dumpster to be discharged to a proper disposal landfill.

3. Filtrate Pump Station:

Function is to receive gravity flow from the dewatering sludge press from the underdrain system and discharge to Headworks.

H. BIOSOLIDS MANAGEMENT- BACK-UP:

All solids which are concentrated in the sludge hopper of each of the three (3) equalization basins and the RAS/WAS pit, constitute the material generated by the treatment process which must be stabilized for volume reduction, methane production, and pathogen destruction. This will result in a product for which ultimate disposal can safely be provided at a landfill. All components included in the Biosolids Management Backup System are identified and are detailed in the following sub-sections.

1 Equalization Primary Sludge Pumps and Meter/Indicator/Transmitter:

a) Function is to convey settled solids from the three (3) Equalization Basin Sludge Hoppers (not in use) and the RAS/WAS basin to the digesters. During operation, the piping and valving matches each of the pumps with its respective equipment. A magnetic flow tube and indicator/transmitter are installed in the common discharge line to the digesters.

b) After sludge reaches acceptable degree of dryness it is removed from surface of bed and disposed of at landfill.

*OFFLINE*

2. Digesters and Appurtenances:

a. Function is to stabilize the sludge and to (a) reduce sludge volume, (b) provide a high level of pathogen destruction, (c) produce methane gas for energy, and (d) minimize odors in digester sludge. Two (2) digesters are provided, but because only one (1) sludge recirculation pump and one (1) sludge heat exchanger are installed, only one (1) digester can be operated in the digestion mode at a given time. The second digester provides additional storage and settling for digested sludge and supernatant produced from the first digester. The biosolids management back up system provides the following sequence of operation:

(1) Sludge is pumped from the RAS/WAS basin to Digester No. 1.

(2) Sludge is recirculated in Digester No. 1 by Sludge Recirculating Pump, main mixer centrally located in the digester and sludge temperature is maintained at 96 - 98F by heat exchanger.

(3) Supernatant is transferred from Digester No. 1 to Digester No. 2 at operator's discretion, and when appropriate, is discharged from Digester No. 2 to the Headworks or drying beds.

(4) Digested sludge is transferred from Digester No. 1 to Digester No. 2, and, when appropriate, is discharged from Digester No. 2 through a magnetic flow tube to the selected sludge drying bed.

b. Methane gas produced by the digestion process only in Digester No. 1 is the primary fuel for the heat exchanger boiler, with any excess methane gas disposed of with the flare.

3. Dual-Fuel Boiler:

Func…