MARINE PARK WATER RECLAMATION FACILITY - Operations and Maintenance Manual

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Section 55 - RAS/WAS Pump Station

55.01General Overview
55.02Design Criteria
55.03Computer Assisted Control Strategies
55.04Operating Strategies
55.05Troubleshooting
55.06Safety
55.07Records/Sampling


55.01 General Overview

Activated sludge that has settled in the secondary clarifiers is pumped back to the aeration basins by the RAS pumps. A portion of the settled activated sludge approximately equal to the activated sludge solids "grown" in the process is pumped to the Southside Interceptor by the WAS pumps with gravity flow to the Westside WWTP.

RETURN ACTIVATED SLUDGE

The center well in each secondary clarifier contains a return activated sludge (RAS) box. Settled activated sludge is lifted off the floor of the clarifier with a set of collection pipes. The driving head to transport the activated sludge through these pipes is generated by opening a discharge orifice in each pipe in the RAS sludge box. This discharge orifice is located below the water surface elevation of the clarifier. The orifices are adjusted to allow the RAS box to be "flooded" at all times.

There are four RAS pumps located in the RAS Pump Station. The purpose of these pumps is to pump RAS from the RAS box in each clarifier to the aeration basins. Under normal operating conditions, the manual valves are positioned so that RAS pumps P-15011 and P-15012 draw from secondary clarifier M-14041 and RAS pumps P-15013 and P-15014 draw from secondary clarifier M-14042.

WASTE ACTIVATED SLUDGE

The WAS pumps are progressing cavity pumps located in the RAS Pump Station. The WAS pumps are fed from the header on the discharge of the RAS pumps. The WAS flow is measured with a magnetic flowmeter to provide a measurement of the mass of biological solids wasted from the activated sludge process.

The pumping scheme for the WAS pumps runs for a timed period each day.

SECONDARY SCUM PUMPING

Periodically, the scum is automatically pumped out using the progressing cavity pump. This progressing cavity pump (SSM Transfer Pump) transfers the scum to the WAS pipeline running to the Westside WWTP. Although manual controls are placed at the Secondary Scum Box, the process of pumping the concentrated secondary scum is an automatic operation.

Because much of the scum collected in the rotating trough is clear water, it is not advantageous to pump the entire quantity to the Westside WWTP. Two types of automatic pumping are provided for the Secondary Scum Box. Normally, the operators will set the pump controls for REMOTE and the PLC will set the valves to recycle and pump from the high level switch down to low level switch. Once each day at a preset time the PLC will set the valves to send scum to the WAS line and then pump from low level switch down to low-low level switch.

DRAINING STRUCTURES

The RAS pumps also provide the driving head to drain the water from the major water holding structures on the plant site. A drain pipe from the plant site ties into two of the RAS pumps. The water from each structure is pumped to aeration basins for treatment. The two features of the RAS pumps which make them desirable for draining structures are their flow capacity and their vertical location. Because the RAS pumps are located in the basement of the RAS Pump Station, each structure can be drained to a low level. Draining structures is infrequently done and is a manual operation.

55.02 Design Criteria

RETURN ACTIVATED SLUDGE PUMPS
Number of Units
     Initial4
     Phase 28 (4 new, 4 existing)
     Ultimate12
TypeVertical, dry-pit, non-clog centrifugal
Minimum Capacity, each500 gpm
Maximum Capacity, each2,750 gpm
Discharge Pressure10 psig
Horsepower, each30 hp
SpeedVariable
ControlManual, setpoint or ratio
 
WASTE ACTIVATED SLUDGE PUMPS
Number of Units
     Initial2
     Phase 24 (2 new, 2 existing)
     Ultimate6
TypeProgressing Cavity
Capacity, each100 gpm
Discharge Pressure120 psig
Horsepower, each20 hp
Speed225 rpm
ControlTimer or manual
 
SSM TRANSFER PUMP
Number of Units
     Initial1
     Phase 22 (1 new, 1 existing)
     Ultimate3
TypeProgressing Cavity
Capacity100 gpm

55.03 Computer Assisted Control Strategies

55.03.a. General Overview

At the MPWRF Return Activated Sludge in the secondary clarifier is pumped back to the aeration basins automatically by the PLC based on a desired setpoint by the operator. This setpoint is identified as a percentage (%) of the total plant flow and is continually calculated in ten minute intervals by the PLC, and monitored by the PLC/SCS. The RAS pumps are also used to dewater water holding structures, and is a manual operation. Waste activated sludge is pumped to the South Interceptor using progressing cavity pumps for a timed period each day. Secondary scum is pumped automatically and is controlled by the PLC.

55.03.b. Control Strategies

This section tells the operator how to interact with the PLC and the SCS, describes each control loop, and describes how and where alarm equipment status is transmitted.

55.03.b.1. RAS Pumps

Loop Function:Monitor pump ON status and REMOTE position, and determines RAS flow based on total plant flow. Monitors RAS flow from each clarifier, subtracting WAS flow, and provides for pump sequencing.
Instrumentation:HS-15011, HS-15012 HS-15013, HS-15014 (HAND/OFF/REMOTE handswitch [HOR])
(Located at each AFD).

HS-15011, HS-15012, HS-15013, HS-15014 (START/STOP pushbuttons [SS])
(Located at each AFD).

QL-15011, QL-15012, QL-15013, QL-15014 (Power on light [POWER ON])
(Located at each AFD)

QL-15011, QL-15012, QL-15013, QL-15014 (Pump on light [PUMP ON])
(Located at each AFD).

SI-15011, SI-15012, SI-15013, SI-15014 (Speed indicator)
(Located at each AFD).

SHK-15011, SHK-15012 SHK-15013, SHK-15014 (Pump speed manual controller [0-100%])
(Located at each AFD).

FIT-15031 (Magnetic flow meter)
(Located on each discharge header for each pair of RAS pumps).

FIT-09091, FIT-09092, FIT-09093 (Magnetic flow meter)
(Located on RAS line to each aeration basin).
Alarms:QL-15011, QL-15012, QL-15013, QL-15014 (Pump fail light [FAIL])

PSH-15011, PSH-15012, PSH-15013, PSH-15014 (High pressure switch for each RAS pump that shuts down the pump in event of a high discharge pressure)
PLC/SCS Function:Monitor pump on status (OOR), QL-15011, QL-15012, QL-15013, QL-15014

Monitor HOR handswitch REMOTE position (OOR), QL-15011, QL-15012, QL-15013, QL-15014.Monitor discharge high pressure switch and provide alarm, PAL-15011, PAL-15012, PAL-15013, PAL-15014

Monitor local pump fail from AFD and provide alarm (RUN FAIL), QA-15011, QA-15012, QA-15013, QA-15014.Determine pump run fail in REMOTE mode and provide alarm (RUN FAIL), QA-15011, QA-15012, QA-15013, QA-15014

Provide pump sequencing

Provide RAS flow control and indication from each clarifier, FIK-15031, FIK-15032

Sum RAS flow from each clarifier and subtract WAS flow to get total RAS flow, FI-15033

Operation:

  1. When selected to REMOTE, there are three modes of control for RAS pump control; MANUAL, AUTO, and RATIO. The mode selected is used for control of all four RAS pumps. There is one PID loop faceplate for each pair of pumps at the SCS CRT allowing operating personnel to monitor pump performance and make control changes as defined below. The PLC/SCS is programmed for bumpless transfer between modes. Current speed is maintained when modes are changed.

    When selected to MANUAL mode, each pump can be started and stopped and individual pump speed can be adjusted through the SCS CRT.

    When selected to AUTO mode, the speed of a pump is controlled by a PID flow controller to maintain a RAS flow setpoint. Individual flow setpoints can be set for each pair of RAS pumps. If both pumps in a pair are selected to REMOTE, the first pump selected to REMOTE will function as LEAD with the other pump assigned as backup. The LEAD pump may be changed by operations through the SCS CRT. The LEAD pump in each RAS pump pair is automatically started by the PLC/SCS system and runs continuously. If the LEAD pump fails, the backup pump is started if it is in REMOTE.

    When selected to RATIO mode, operators can enter a ratio setpoint of RAS flow to influent plant flow. The average influent flow is calculated over a 10 minute window and is used for control. This is done because the upstream bar screen cycle can cause abrupt short changes in influent flow. The RAS ratio setpoint range is 25% to 75%. The PLC calculates the total RAS flow setpoint needed, and divides the flow setpoint between the RAS flow controllers if at least one pump in each pair is in REMOTE. The pumps are sequenced in the same manner as they are in the AUTO mode.

    A minimum RAS flow setpoint for each pair, initially set at 600 GPM, will be used in AUTO and RATIO modes.

    The PLC also monitors a high pressure switch that is closed under normal operating conditions. While a RAS pump is operating in REMOTE, an open pressure switch indicates air mixing with the RAS and will stop the pump. The SCS will alarm this condition.

    When draining structures the RAS controllers should be placed in MANUAL mode.

55.03.b.1. WAS Pumps

Loop Function:Monitors pump in REMOTE, provides high pressure alarm and pump failure. Monitors either TIMED or TOTALIZED flow of WAS pump, and starts backup pump in the event of LEAD pump failure.
Instrumentation:FIT-15091 (Magnetic flow meter)
(Located at discharge header from the WAS pumps).

PI-15091, (Pressure Indicator)
(Located at WAS and SSM discharge header).

HS-15081, HS-15082 (HAND/OFF/REMOTE handswitch [HOR])
(Located at MCC-09).

HS-15081, HS-15082 (START/STOP pushbuttons [SS])
(Located at MCC-09).

QL-15081, QL-15082 (Pump on light [ON])
(Located at MCC-09).

HS-15081, HS-15082 (High pressure reset pushbutton [RESET])
(Located at MCC-09).

PSH-15081, PSH-15082 (High Discharge Pressure Switch)
(Located at each WAS Pump discharge).
Alarms:QA-15081, QA-15082 (Pump run failure [RUN FAIL])

QL-15081, QL-15082 (Pump high discharge pressure light [HIGH PRESSURE]).
PLC/SCS Function:Monitor pump on status (OOR), QL-15081, QL-15082.

Monitor HOR handswitch REMOTE position (OOR), QL-15081, QL-15082.

Monitor discharge pressure switch and provide alarm (HIGH PRESSURE), PAH-15081, PAH-15082.

Determine pump run fail in REMOTE and provide alarm (FAIL), QA-15081, QA-15082.

Provide pump sequencing.Control flushing of WAS line with W3 water.Indicate totalized WAS flow, FQI-15091.

Operation:

  1. When selected to REMOTE, there are three modes for WAS pump sequencing; MANUAL, TIMED and TOTALIZE. The first pump placed in REMOTE will function as the LEAD. The LEAD pump may be changed by operations using a SCS CRT handswitch. If the LEAD pump fails, the backup pump is started if it is in REMOTE.

    In MANUAL mode the pumps can be manually started and stopped remotely through the SCS CRT. In TIMED mode, the LEAD WAS pump is run for a timed period each day followed by FV-15091 flushing for a timed period. Operators can enter the WAS pump start time, pumping duration, and flushing duration through the SCS CRT. In the TOTALIZE mode, the WAS pump is run until it pumps a specified volume entered by the operator through the SCS CRT. Operators also enter the WAS pump start time and flushing duration through the SCS CRT. The WAS pumps are interlocked so that they can only run when at least one of the RAS pumps are running.

55.03.b.1. Secondary Scum (SSM) Transfer Pump

Loop Function:Monitors and controls level of secondary scum box when in REMOTE position. Automatically pumps secondary scum through the RAS line to the aeration basin influent; and once per day to the WAS line as adjusted by the operator through the SCS.
Instrumentation:HS-15061 (HAND/OFF/REMOTE handswitch [HOR])
(Located at MCC-09).

HS-15061(START/STOP pushbuttons [SS])
(Located at MCC-09).

QL-15061 (Pump on light [ON])
(Located at MCC-09).

HS-15061 (High pressure reset button [RESET])
(Located at MCC-09).

PI-15091 (Pressure indicator for pump discharge)
(Located on SSM Discharge Header).

PSH-15061 (High Discharge Pressure Switch)
(Located at SSM Transfer Pump discharge).

LSHH-14011 (Scum pit level switch - Sends High Scum Box Level to PLC)
(Located at secondary scum pit)

LSH-14011 (Scum pit level switch - Sends START pump signal to PLC)
(Located at secondary scum pit)

LSL-14011 (Scum pit level switch - Sends STOP pump signal to PLC. Disabled if pumping to the WAS line)
(Located at secondary scum pit)

LSLL-14011 (Scum pit level switch - Sends STOP pump signal to PLC if pumping to the WAS line)
(Located at secondary scum pit)
Alarms:QA-15061 (Pump P-15061 run failure [RUN FAIL]).

QL-15061 (Pump high discharge pressure light [HIGH PRESSURE]).
PLC/SCS Function:Monitor pump on status (OOR), QL-15061

Monitor HOR handswitch REMOTE position (OOR), Ql-15061

Monitor discharge pressure switch and provide alarm (HIGH PRESSURE), PAG-15061

Determine pump run fail in REMOTE and provide alarm (FAIL), QA-15061

Monitor scum box high level switch and provide alarm, LAHH-14011

Run pump based on level switch inputs, LSH-14011, LSL-14011, LSLL-14011

Once each day empty the Secondary Scum Box into WAS line

Monitor SCUM/WATER selector switch in manual mode (SCUM/WATER), HS-15061

Monitor discharge valve positions (OC), ZS-15061, ZS-15030

Position valves for recycling water or discharging scum to the WAS line, FV-15030, FV-15061

Operation:

  1. When selected to REMOTE, the pump is started and stopped based on level in the scum box. Normally the pump is started at the high level switch and stopped at the low level switch. At a preset time of day, adjustable by the operator through the SCS CRT, the pump is run between the low level switch and the low-low level switch.

    The PLC/SCS system controls the position of the SSM transfer pump discharge valves to direct the scum. When pumping between the high and low level switches, the scum is sent to the RAS line and the aeration basin. When pumping between the low and low-low level switches the scum is directed to the WAS line.

55.04 Operating Strategies

55.04.a. General Operating Strategy

Each RAS pump is powered from an adjustable frequency drive (AFD). The speed of the pump is controlled by adjusting the manual speed controller on the AFD panel.

The WAS and Secondary Scum (SSM) pumps will shut down if there is a high pressure in the discharge line as sensed by the high pressure switch. This interlock is reset by pressing the RESET pushbutton or by placing the HOR handswitch to OFF.

When the SSM transfer pump is in HAND, the position of the SSM transfer pump discharge valves is controlled by the SCUM/WATER handswitch located at the secondary scum box. In the SCUM position, the discharge valves are set to direct the secondary scum to the WAS line. In the WATER position the secondary scum is directed to the RAS line and back the aeration basins.

When selected to REMOTE, there are three modes of control for RAS pump control; MANUAL, AUTO, and RATIO. The mode selected is used for control of all four RAS pumps. There is one PID loop faceplate for each pair of pumps at the SCS CRT allowing operating personnel to monitor pump performance and make control changes as defined below. The PLC/SCS is programmed for bumpless transfer between modes. Current speed is maintained when modes are changed.

When selected to MANUAL mode, each pump can be started and stopped and individual pump speed can be adjusted through the SCS CRT.

When selected to AUTO mode, the speed of a pump is controlled by a PID flow controller to maintain a RAS flow setpoint. Individual flow setpoints can be set for each pair of RAS pumps. If both pumps in a pair are selected to REMOTE, the first pump selected to REMOTE will function as LEAD with the other pump assigned as backup. The LEAD pump may be changed by operations through the SCS CRT. The LEAD pump in each RAS pump pair is automatically started by the PLC/SCS system and runs continuously. If the LEAD pump fails, the backup pump is started if it is in REMOTE.

When selected to RATIO mode, operators can enter a ratio setpoint of RAS flow to influent plant flow. The average influent flow is calculated over a 10 minute window and is used for control. This is done because the upstream bar screen cycle can cause abrupt short changes in influent flow. The RAS ratio setpoint range is 25% to 75%. The PLC calculates the total RAS flow setpoint needed, and divides the flow setpoint between the RAS flow controllers if at least one pump in each pair is in REMOTE. The pumps are sequenced in the same manner as they are in the AUTO mode.

A minimum RAS flow setpoint for each pair, initially set at 600 GPM, will be used in AUTO and RATIO modes. The PLC also monitors a high pressure switch that is closed under normal operating conditions. While a RAS pump is operating in REMOTE, an open pressure switch indicates air mixing with the RAS and will stop the pump. The SCS will alarm this condition.

When draining structures the RAS controllers should be placed in MANUAL mode.

When selected to REMOTE, there are three modes for WAS pump sequencing; MANUAL, TIMED and TOTALIZE. The first pump placed in REMOTE will function as the LEAD. The LEAD pump may be changed by operations using a SCS CRT handswitch. If the LEAD pump fails, the backup pump is started if it is in REMOTE.

In MANUAL mode the pumps can be manually started and stopped remotely through the SCS CRT. In TIMED mode, the LEAD WAS pump is run for a timed period each day followed by FV-15091 flushing for a timed period. Operators can enter the WAS pump start time, pumping duration, and flushing duration through the SCS CRT. In the TOTALIZE mode, the WAS pump is run until it pumps a specified volume entered by the operator through the SCS CRT. Operators also enter the WAS pump start time and flushing duration through the SCS CRT. The WAS pumps are interlocked so that they can only run when at least one of the RAS pumps is running.

When selected to REMOTE, the SSM transfer pump is started and stopped based on level in the scum box. Normally pump is started at the high level switch and stopped at the low level switch. At a preset time of day, adjustable by the operator through the SCS CRT, the pump is run between the low level switch and the low-low level switch.

The SCS/PLC system controls the position of the SSM transfer pump discharge valves to direct the scum. When pumping between the high and low level switches, the scum is sent to the RAS line and the aeration basin. When pumping between the low and low-low level switches the scum is directed to the WAS line.

55.04.b. Normal Operating Conditions

Note: Normal plant operations will use the PLC and the SCS CRT to enter setpoints, select equipment operating modes and monitor equipment status. Local control of equipment will be covered under section 55.04.c. Alternate Operating Conditions.

55.04.b.1. RAS Pumps

There are three modes of operation of the RAS pumps; MANUAL, AUTO, and RATIO. The normal mode of operation of the RAS pumps will be in the RATIO mode. The operator places a pair of RAS pumps in REMOTE. The first pump put in REMOTE becomes the lead pump, with the second pump becoming the backup. Equipment Status Table 55.04.b.1 summarizes the proper equipment configuration for normal plant operation.

EQUIPMENT STATUS TABLE 55.04.b.1.
Equipment DescriptionStatus
P-15011 (RAS Pump #1)HS-15011 Handswitch to REMOTE
P-15012 (RAS Pump #2)HS-15012 Handswitch to REMOTE
P-15013 (RAS Pump #3)HS-15013 Handswitch to REMOTE
P-15014 (RAS Pump #4)HS-15014 Handswitch to REMOTE
P-15215 (RAS Pump #5)HS-15215 Handswitch to REMOTE
P-15216 (RAS Pump #6)HS-15216 Handswitch to REMOTE
P-15217 (RAS Pump #7)HS-15217 Handswitch to REMOTE
P-15218 (RAS Pump #8)HS-15218 Handswitch to REMOTE
FIT-15031, FIT-15032
FIT-15233, FIT-15234
Magnetic flowmeter on for each pair of RAS pumps
FIT-09091, 09092, 09093
FIT-09294, 09295, 09296
Magnetic flowmeter on for each aeration basin on line
Secondary clarifier draft tubesOpen for each clarifier on line
Suction valve for RAS pump(s)Open for each pump on line
Discharge valve for RAS pump(s)Open for each pump on line


55.04.b.2. WAS Pumps

There are three modes of operation for the Waste Activated Sludge Pumps; MANUAL, TIMED, and TOTALIZED. The normal mode of operation for the WAS pumps is in the TOTALIZED mode. In this mode the operator selects TOTALIZE mode through the SCS CRT, entering the necessary information for this type of wasting mode. Equipment Status Table 55.04.b.2. summarizes the proper configuration for normal plant operation.

EQUIPMENT STATUS TABLE 55.04.b.2.
Equipment DescriptionStatus
P-15081 (WAS Pump #1)HS-15081 Handswitch in REMOTE
P-15082 (WAS Pump #2)HS-15082 Handswitch in REMOTE
P-15283 (WAS Pump #3)HS-15283 Handswitch in REMOTE
P-15284 (WAS Pump #4)HS-15284 Handswitch in REMOTE
Suction valve for WAS pumpsOpen to each pump on line
Discharge valve for WAS pumpsOpen to each pump on line


55.04.b.3. Secondary Scum (SSM) Transfer Pump

The operator normally selects the REMOTE position for the scum pump, through the SCS CRT screen. This allows the pump to pump between the high level switch in the secondary scum box and the low level shutoff switch. The scum is returned to the head of the aeration basins. Once per day, at a preset time, scum is pumped from the low level switch to the low-low level switch. The scum is redirected to the waste sludge line to the Westside Treatment Plant. Equipment Status Table 55.04.b.3. summarizes the proper equipment configuration for normal plant operation.

EQUIPMENT STATUS TABLE 55.04.b.3.
Equipment DescriptionStatus
P-15061 (SSM Pump # 1)HOR Handswitch in REMOTE
P-15262 (SSM Pump # 2)HOR Handswitch in REMOTE
ZS-15030, ZS-15061, ZS-15230, ZS-15272SSM Pump discharge valves functioning
Suction valve to SSM PumpOpen to each pump
Discharge valve to SSM PumpOpen to each pump


55.04.c. Alternate Operating Conditions

55.04.d. Startup/Shutdown Conditions

55.04.e. Key Control Data and 4 Level Alarm Table

55.04.f. Contingency Plans

A Contingency Plan is written to handle an unpredictable occurrence that has a reasonable chance of happening. Most Contingency Plans deal with situations where having a written procedure can help prevent loss of a unit process, handle a process upset or respond to a hazardous situation. The following is a list of Contingency Plans developed for the RAS/WAS Pumping Station. The plans are kept in the Contingency Plan Notebook located in the Operator Laboratory and the Shift Supervisor Office.

55.04.g. Standard Operating Procedures

A Standard Operating Procedure (SOP) is written to handle operator activities performed on a regular but not necessarily daily basis. Most SOPs deal with potentially hazardous activities making it important that a written, step-by-step procedure be available. The following is a list of SOPs developed for the RAS/WAS Pumping Station. The procedures are kept in the SOP Notebook located in the Operator Laboratory and the Shift Supervisor Office.

55.05. Troubleshooting

See Section 75 Maintenance Plan for troubleshooting dealing with the operation of the RAS pumps, WAS pumps, and the SSM pump.

See Table 55.05.a.1. for troubleshooting the RAS pumps.

See Table 55.05.a.2. for troubleshooting the WAS pumps.

See Table 55.05.a.3. for troubleshooting the SSM pump.


TABLE 55.05.a.1. - Troubleshooting the RAS Pumps
ObservationProbable CauseSolution
RAS pump not operating.RAS pump "tripped out" and backup pump not in REMOTE.Reset lead pump once, and place backup pump in REMOTE.
Pump shut down on PRESS alarm.Indicates air in lines. Correct by bleeding air and checking all piping.
RAS pump not maintaining desired flow setpoint.Pump controller not in correct mode.Place in correct mode (either AUTO or RATIO).
Pump or piping partially plugged.Switch pumps and observe flow. If flow is still below setpoint backflush suction lines.



TABLE 55.05.a.2. - Troubleshooting the WAS Pumps
ObservationProbable CauseSolution
WAS pump not operating.RAS pump "tripped out" and backup pump not in REMOTE.Reset once, and place backup pump in REMOTE.
Pump has stopped due to high discharge pressure alarm.Lock out pump and investigate piping.
Pump has stopped due to high discharge pressure alarm.Solids deposition in discharge line due to insufficient flushing.Increase timer setting on FV-15091.



TABLE 55.05.a.3. - Troubleshooting the SSM Pump
ObservationProbable CauseSolution
Secondary Scum Pit full.SSM Pump not operating due to pump not in REMOTE position.Place SSM Pump in REMOTE.
SSM Pump not operating due to high discharge pressure.Lock out pump and investigate for plugged pump and/or lines.
Faulty high level switch (LAHH-14011), and scum pit not actually full.Repair/replace high level switch.
SSM Pump "tripped out" on overload.Reset pump breaker once.
Faulty high level start switch (LSH-14011).Repair/replace LSH-14011 switch.
Heavy scum layer on scum pit surface.FV-15030 inoperable.Repair valve and/or controls.


55.06. Safety

No specific safety considerations for the RAS/WAS Pumping Station have been identified at this time.

55.07 Records/Sampling

55.07.a. Sampling Schedule

IDX #
PARAMETER
NAME
SAMPLE
FREQUENCY
SAMPLE
TYPE
SAMPLE
LOCATION
159
RAS SS (mg/L)
7/W
Grab
RAS Pumps
160
RAS VS (%)
2/W
Grab
RAS Pumps
161
WAS SS (mg/L)
7/W
Grab
RAS Pumps
162
RAS FLOW (MGD)
Continuous
N/A
RAS Line To AB's
163
WAS FLOW (MGD)
Continuous
N/A
WAS Line To Blandford


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