FA480318R0004_Atth_8_Wateree_WWTP.pdf

Wastewater and Storm Water Program Points-of-Contact (POC)

Base Name: Shaw Air Force Base (AFB)

Location and Mailing Address: 428 Chapin Street

Shaw AFB, SC 29152

Wastewater and Storm Water Point-of-Contact: C.G. Mathews

Title: Water Program Manager

Organization: 20 CES/CEIE

Office Phone Number (Commercial): privacy act

Office Phone Number (DSN):

E-Mail Address: privacy act

Alternate Point-of-Contact:

Title:

Organization:

Office Phone Number (Commercial):

Office Phone Number (DSN):

E-Mail Address:

Contact Name / Title Organization Responsibility

C.G. Mathews 20 CES CEIE Water Program Manager

Danny McKay 20 CES CEIE Compliance Chief

David Conlee 20 CES Infrastructure Chief

Edward Brown 20 CES CEOD CE Civilian Operations M

Additional POCs

Component Location Description and Purpose

Wastewater Collection System Throughout the installation

The Shaw AFB wastewater collection system includes over 134,500 linear feet (LF) of gravity sewer mains on the main base and 108,200 LF in Military Family Housing (MFH). There are approximately 863 manholes and 16 sewage lift stations. All wastewater is discharged to the base-operated activated sludge wastewater treatment plant.

Refer to the Sanitary Sewer Collection System worksheet for additional details.

Sewage Lift Stations Throughout the installation

The wastewater collection system includes 19 sewage lift stations that pump sewage in areas where gravity flow is not possible.

Refer to the Sewage Lift Stations worksheet (Table A-5) for additional details.

Industrial Wastewater and Storm Water Pretreatment Throughout the installation

Nineteen active oil/water separator (OWS) pretreatment units serve the industrial facilities of the installation. The units remove oil and grit from industrial wastewater flows prior to discharge to the WWTP or stormwater discharges from industrial areas. Seven grease traps are located around the installation and are used to remove grease from wastewater discharges from kitchen and food preparation facilities.

Refer to the Oil/Water Separators and Grease Trap tabs.

Table A-2. Summary of Wastewater and Storm Water System Physical Assets

Wastewater Treatment Plant (WWTP)

Bldgs. 300, 304, 305, 306, 307, 311, and 312

Between Aiken St. and Woodville Circle

Shaw AFB's domestic, commercial, and industrial wastewater is treated at a federally owned treatment works (FOTW) located on the installation.

The WWTP complex consists of preliminary, secondary, and tertiary treatment processes including activated sludge, tertiary filtration, and sludge stabilization and dewatering. The current treatment capacity is 1.2 million gallons per day (MGD). The average daily flow is 0.50 MGD.

Refer to the Wastewater Treatment Plant Summary Information worksheet (Table A-12) for additional details.

Wastewater Outfalls and Receiving Waters Wateree River

All effluent treated by the Shaw WWTP is discharged to the Wateree River. This discharge is permitted under National Pollutant Discharge Elimination System (NPDES) Permit No. SC0024970.

Refer to the Watershed Summary and Summary of Wastewater System Permits tables (Tables A-3 and A-4), and the Summary of Wastewater Receiving Waters worksheet for additional details.

Non-Discharge Wastewater Treatment Throughout the installation

Existing records indicate that approximately 50 septic tanks may exist on the installation.

Refer to the Septic Tank Systems table (Table A-10) for additional details.

Storm Water Drainage System Throughout the installation

The storm water drainage system consists of approximately 66,000 LF of open drainage channels (ditches), approximately 166,000 LF of underground piping (storm sewers), and sheet flow.

Refer to the Storm Drainage Lines and Lift Stations worksheet for additional details.

Storm Water Lift Stations Headquarters There is one known storm water lift station on the installation. It is located in the basement of the Headquarters building.

Storm Water Detention Ponds Throughout the installation There are five storm water detention ponds on the base that provide storage for collected storm water and trap pollutants in runoff.

Storm Water Outfalls and Receiving Waters Throughout the installation

Storm water is discharged from the base through seven outfalls. Storm water discharges to Mush Branch Creek, Long Branch Creek, and Booth's Pond. Mush Branch Creek, Long Branch Creek, and Booth's Pond ultimately discharge to the Pocotaligo River. Storm water discharges from industrial areas at Shaw AFB are permitted under NPDES Permits No. SCR000000 and SC0024970.

Refer to the Summary of Storm Water System Permits and Summary of Storm Water Drainage Areas, Outfalls, and Receiving Waters tables (Tables A-19 and A-20) for additional details.

Wastewater Discharge via

FOTW?

Storm Water Discharge via Storm Water Drainage

System?

Black River Watershed No Yes No

The Black River Watershed receives water flowing away from the installation to the east and south of the base. The waterbodies that contribute to the Black River from Shaw AFB are Mush Branch Creek, Long Branch Creek, and Booth's Pond.

These smaller streams and ponds all discharge to the Pocotaligo River, which ultimately flows into the Black River.

Wateree River Watershed Yes No No

The Wateree River watershed receives water flowing to the south and west away from Shaw AFB.

The Wateree River Watershed is at the southern tip of the Catawba River Basin and the Wateree River flows into the Congaree River and into the Santee River Basin. Beech Creek and the Wateree River are the primary bodies of water that collect runoff from the base.

Pocotaligo River No Yes No

On TMDL 303d List?

Table A-3. Watershed Summary

CommentsReceiving Waters

Discharge Via What System?

Wastewater Discharge via

FOTW?

Storm Water Discharge via Storm Water Drainage

System?

On TMDL 303d List?

Table A-3. Watershed Summary

CommentsReceiving Waters

Discharge Via What System?

Wateree River Yes No Yes The Wateree river is on the 303d list for Metals (Mercury) for the entire length of the river.

Black River No Yes No

The Black River receives flow from the Pocotaligo River. There are no direct discharges of water from Shaw AFB to the Black River.

The Black River is on the 303d list for Metals (Mercury) for the entire length of the river. Further downstream, the river is on the 303d list for Pathogens and Organic Enrichment/ Low Dissolved Oxygen.

Beech Creek No No No Beech Creek is a tributary to the Wateree River.

Mush Branch Creek No Yes No Mush Branch Creek is a tributary to the Pocotaligo River.

Long Branch Creek No Yes No Long Branch Creek is a tributary to the Pocotaligo River.

Booth's Pond No Yes No Booth's Pond is a tributary to the Pocotaligo River.

Permit Name Permit Type Issuing Agency Permit Owner Date Issued Expiration Date Purpose Discharge Point(s)

NPDES Permit for Discharge to Surface Waters (wastewater effluent) Permit No. SC0024970

Individual

South Carolina Department of Health and Environmental Control (SCDHEC) Bureau of Water

Shaw AFB

1 Jun 03

(Modified 1 May 05)

31 May 08

Permit to authorize and limit wastewater effluent discharge from WWTP, treated groundwater, and storm water from diked fuel storage containment area to receiving waters

001, 001A – Wateree River;

002, 02A – Wateree River;

007 – Mush Branch Creek to Pocotaligo River

Permit to Construct No.

18,935-IW Individual SCDHEC

Bureau of Water Shaw AFB 23 Mar 05

23 Mar 06 (for construction to begin)

23 Mar 07 (for construction to be completed)

Permit to construct wastewater collection system (Project Name: Shaw Air Force Base/Pump Station, Force Main, and Diffuser to Wateree River)

Outfalls 002 and 02A

1. Outfall 002 receives treated wastewater from the WWTP

4. Outfall 02A receves treated groundwater

5. Outfall 007 receves storm water from a diked jet fuel containment area

Table A-4. Summary of Wastewater System Permits

Comments

Wastewater System Receiving Waters

Wastewater Outfall: Wateree River Former Outfall: Beech Creek Outfall

The Shaw WWTP currently discharges effluent to Wateree River located approximately 8 miles west of the base. Effluent flows from the base through a 24-inch gravity high density polyethylene (HDPE) pipe to a pump station near the former Beech Creek Outfall. The pump station discharges to the Wateree River. The new effluent location is near the intersection of US 76/378 and the Wateree River.

Reference: Wastewater Treatment Plant Effluent Force Main, Shaw AFB , TransSystems Corporation

Sanitary Sewer Collection System

What is the estimated total linear feet of gravity sewer lines? 134,500 (Main Base)

108,200 (MFH)

241,700 (Total)

Approximate number of sanitary sewer manholes: 870

Are there any combined sewers? Yes No

Comments

2. Shaw AFB is currently under a consent agreement with SCDHEC over excessive copper in the WWTP effluent. Shaw AFB is experiencing high concentrations due to storm water inflow to the WWTP effluent. The excessive rainwater may be decreasing alkalinity that restricts how much copper can be discharged from the WWTP. Shaw AFB has exceeded their NPDES flow limits in the past and if areas of inflow and infiltration (I&I) are not identified and corrected, limits will also be exceeded in the future. A project has been awarded to perform an I&I study of the sanitary sewer collection system (Project # VLSB 06-1250). The I&I evaluation will allow improved management of the collection system to help maintain compliance with the Shaw AFB NPDES permit. In addition to the I&I study, a project has been programmed to repair deteriorated sewer lines and manholes to eliminate I&I (Project # VLSB 07-0130).

1. It is recommended that the base ensure that sanitary sewer line cleaning is kept on the CEO's recurring work program (RWP). CEO expects to receive a new Jet-Vac-type truck/trailer within the next year to assist with sewer line cleaning.

3. The recreational vehicle campsites, collectively known as FAMCAMP, were not constructed for convenient RV sewer connection. Sites should be equipped with standard sewer connections at the rear left side of each site that correspond with the water and electrical hook-ups. Customer use of the site is not satisfactory due to current sewer set-up. A project has been recommended to install new sewer connections to the base FAMCAMP (Bldg 1930) recreational vehicle campsites 2 through 21 (Project # VLSB 03-0040).

Lift Station

ID

Common Name / Adjacent Bldg.

Date of Construction or Upgrade

Pump / Motor Type

Emergency Power Source? Alarms Sensaphone

Emergency Information Displayed?

High Level Bypass?

2 AAFES Gas Station / Bldg. 2 1995

(2) submersibles

3 HP, 208 V,

3 Ph

Yes, dedicated generator

High Level Audible and

Visual Alarms

No Yes No

12 Sewage Lift Station / Near Main Gate Prior to 1955 (2) submersible 5-

HP Grinder Pumps No Audible and

Visual Alarms

Yes Yes No

25 DRMO, located at 260 Aiken Street 2002

(2) submersible grinder pumps

2 HP

No

High Level Audible and

Visual Alarms

No No No

231 Hazmart one-1.5 Hp pump 3 HP No High Level

Power Fail Yes Yes No

Photos / Comments

Sewage Lift Stations

Common Name / Adjacent Bldg.

Date of Construction or Upgrade

Pump / Motor Type

Emergency Power Source? Alarms Sensaphone

Emergency Information Displayed?

High Level Bypass?

Photos / Comments

Sewage Lift Stations

600 Round House / Main Base

1941, upgrade planned FY13

(3) submersibles, pump #3 is a backup

Yes, dedicated generator

Audible and Visual Alarms

Yes No Yes

1127 1 single phase 1HP No

1122 Head Quarters 1983

(2) submersibles, 3/4 HP, 1 Ph, 208 V

Onsite Generator for entire building and lift station

Audible and Visual Alarm No No No

Common Name / Adjacent Bldg.

Date of Construction or Upgrade

Pump / Motor Type

Emergency Power Source? Alarms Sensaphone

Emergency Information Displayed?

High Level Bypass?

Photos / Comments

Sewage Lift Stations

1130 9th Air Force/Headquarters Unavailable

(2) submersibles with above grade motors, 1.5 HP

Quick connect for mobile generator

Audible and Visual Alarms

No Yes No

1216 Flight Line 2008

(2) ABS

submersible, 10-

Hp each, 3 phase, 208 Volt

10 HP

Quick connect for mobile generator

Sensaphone with audible and visual alarms

Yes No unavailable

1518 Flight Line 2008 (2) centrifugal, 10 HP

Quick connect for mobile generator

Sensaphone with audible and visual alarms yes No No

1600 Flight Line 2008

(2) Piranha M- 35/2D grinder pumps. 4.7-Hp each, 208 Volt, 3 Phase, 75 gpm

10 HP

Quick connect for mobile generator

Audible and Visual Alarms

Yes Yes No

Common Name / Adjacent Bldg.

Date of Construction or Upgrade

Pump / Motor Type

Emergency Power Source? Alarms Sensaphone

Emergency Information Displayed?

High Level Bypass?

Photos / Comments

Sewage Lift Stations

1694 Hush House 2008

(2)ABS ABS

Piranha S-30/2D grinder pumps, 4- Hp each, 208 Volt, 3 Phase, 50 gpmsubmersibles, 2 HP, 240 V, 3 Ph, 2.5 A

No High Level

Audible Alarm

No Yes No

1827 Skeet Range / Condor Country Road 2012

(2) submersibles, 25 HP, 3 Ph, ABS

230 V, 60 Hz

Yes, dedicated generator

High Level Power Fail, Audible and

Visual Alarms

Yes Yes No

1919 Condor Country/AFCENT

(2) submersibles,

1.5 Hp, 208 Volt, 3

phase No No no no

Common Name / Adjacent Bldg.

Date of Construction or Upgrade

Pump / Motor Type

Emergency Power Source? Alarms Sensaphone

Emergency Information Displayed?

High Level Bypass?

Photos / Comments

Sewage Lift Stations

1979 Sewage Lift Station / Patrol Road 2002

(2) submersibles,

7.5 HP, 240 V,

3 Ph, capacity to add another pump

Yes, dedicated generator

High Level Power Fail Audible and

Visual Alarms

Yes Yes No

3227 Base Housing / Wherry, Elm Street 2013

(2) submersible grinder pumps, 3

Phase 280 V, design flow 393 gpm

20 HP

Yes

High Level Power Fail, Audible and

Visual Alarms

Yes Yes No

Base Housing, 5000 Area / Persimmons Street

(2) submersible grinder pumps, 3

Phase, design flow 393 gpm

20 HP

Yes

High Level Power Fail, Audible Alarm

Common Name / Adjacent Bldg.

Date of Construction or Upgrade

Pump / Motor Type

Emergency Power Source? Alarms Sensaphone

Emergency Information Displayed?

High Level Bypass?

Photos / Comments

Sewage Lift Stations

1919 LS1919, 609 ACOM (2) submergible pumps Both

91999 Clarmont Road, off SC Hwy 261 1 mile north of Hwy 378/76 three 75-Hp submersible grinder pumps Yes

High Level Power Fail, Audible Alarm

Yes Yes No

1973 East Gate Guard House 2012

(2) 2-Hp Grinder submersible pumps, each pump 18 gpm, 208 Volt, 3 phase

No

High Level Audible and

Visual Alarms

Common Name / Adjacent Bldg.

Date of Construction or Upgrade

Pump / Motor Type

Emergency Power Source? Alarms Sensaphone

Emergency Information Displayed?

High Level Bypass?

Photos / Comments

Sewage Lift Stations

9197 Youth Center Ball Field 2001

(2) submersibles grinder pumps, 3

HP each, 208 Volt, 3 phase

No

High Level Audible and

Visual Alarms

No No No

Wateree Wateree Recreational 1990

(2) submersible grinder pumps, 2

HP each, 208 Volt, 3 phase

Yes

High Level Power Fail, Audible Alarm

Served

Power Rating (kW)

Phase and Voltage

Fuel Type and

Tank Capacity (gal)

Stationary (Dedicated) or

Mobile (Assigned)?

2 60 120/240 V Natural gas connection Stationary

311 250 120/240 V Diesel, 400 gal, AST Stationary

600 200 277/480 Diesel, 1000 gal, AST Stationary

1827 40 120/240 V Diesel, 250 gal, AST Stationary

1979 80 120/240 V Diesel,150 gal AST Stationary

3227 80 3 Phase, 120/240 V Diesel, 130 gal, AST Stationary

1122 80 3 Phase, 120/240 V Diesel Staionary

9199 300 3 Phase, 120/240 Diesel, 1000 gal, AST Stationary

5630 60 3 Ph, 120/128 V Diesel, 500 gal, AST Stationary

Comments

Generators that Service Sewage Lift Stations

1. Lift stations 1122, 1216, 1130, 1600, and 116 have quick connects for mobile generators. Buildings 1122 and 1130 has a dedicated generator for the entire building.

Comment on the use of telemetry and SCADA to operate sewage lift stations and describe the system capabilities all of the lift stations except for 2 are equipped with Sensaphone autodialers, which contact the Utilities Contractor (currently National O&M) and the Fire Department in the event of an emergency. The remaining seven lift stations do not have Sensaphone autodialers or other means of telemetry. There is a project funded for 2018 to install a new SCADA system to replace the sensaphones.

Comments

Sewage Lift Station SCADA / Telemetry Details

1. A project has been approved for 2018 to install a SCADA system at the WWTP and lift stations to continuously monitor the operation of the different components of the WWTP and the individual lift stations. The project manager is Bob Jones CEC.

OWS ID Org/Site Facility

OWS

Capacity

(Gal)

Does it treat

WW or

SW?

Discharge Location? Process Notes

202 20 LG Railhead 1081 WW Holding Tank

For incidental spills when oil changes occur in the engine shed in the pit below the engine.

207 20 LG Railhead 3000 SW SW

Collects and separates jet fuel from spills during the transfer of fuel from tank cars to the hydrant system storage tanks

339 20 CES sediment trap only 120 WW Sanitary

Sewer Dirt Boys

708 B 20 CES Wash Rack 342 WW Sanitary Sewer Fire Dept Wash Rack

1206 20 CMS Propulsion 912 WW Sanitary Sewer Services 16 floor drains

1511 B 20 CMS Corrosion Control Unavailable WW Sanitary

Sewer Services floor drains

Table A-8. Oil/Water Separators

OWS

Capacity

(Gal)

Does it treat

WW or

SW?

Discharge Location? Process Notes

Table A-8. Oil/Water Separators

1602 PL 20 EMS AGE

Parking Lot Sanitary

Sewer out of service inactive

1602 WR 20 EMS

AGE and

Aircraft Wash Racks

684 WW Sanitary Sewer

Services wash rack and four floor drains

1693 20 EMS North end of runway 2,723 SW SW across pad from hush houses

1610 20 EMS AGE Hot Pit 684 Unavailable Unavailable Unavailable \

1694 20 CMS Hush House Unavailable WW Sanitary Sewer

Services floor drains in Hush House

OWS

Capacity

(Gal)

Does it treat

WW or

SW?

Discharge Location? Process Notes

Table A-8. Oil/Water Separators

1725 20 SUP POL Fuels Lab 2,432 WW Holding Tank Services Fuels Laboratory sink

Outfall 2 N. Gate N. Gate 18,153 SW Outfall 2

Services storm water run off from the northern most part of the base, including the flightline, golf course, and parking apron

Outfall 3A Perimeter Rd. N. End 4,150 SW Outfall 3A storm water and sediment run off

OWS

Runway 20 SVS south end of runway 2,969 SW Outfall 003 incidental spills on runway

2798 Golf Cart Barn Golf Course 500 SW Sanitary Sewer to rinse off golf carts; collects sediiments, effluent goes to golf course pond.

OWS

Capacity

(Gal)

Does it treat

WW or

SW?

Discharge Location? Process Notes

Table A-8. Oil/Water Separators

Grease Trap ID Location Grease Trap Capacity (Gal) Pumping Frequency

417 Dining Hall 2000 (2 units) Quarterly

823 Burger King 1000 Quarterly

922 Officers Club 150 Semi-Annually

1048 Hospital 500 (2 units) Quarterly

1401 Bowling Alley 550 Semi-Annually

1402 NCO Club 250 Semi-Annually

1420 Commissary 550 Quarterly

1518 DPC/Grill 550 Quarterly

Table A-9. Grease Traps

1. Reference: Performance Work Statement for Maintenance of Grease Traps and Lift Stations, February 2003.

Building No. Year Constructed Status Comments

Table A-10. Septic Tank Systems there are no active septic tanks on base; the only septic tanks are located at PECR.

Table A-11. Influent Wastewater Details

The WWTP influent pump station (LS 600) has a dedicated emergency generator on site. There is an older pump station associated with LS 600 that could be used in an emergency. The lift station has visual and audible alarms in association with the Sensaphone communication system.

Comment on how the WWTP would handle an influent wastewater stream that is or is suspected of being contaminated by a toxin or other unexpected substance.

The WWTP has an equalization basin located upstream of the influent pump station.

The basin has an approximate volume of 350,000 gallons and a system of blowers and diffusers for mixing and aeration. The large volume allows for contaminants to become less concentrated before entering the treatment process where they could interfere with the biological treatment of the wastewater.

Describe the adequacy of or deficiencies in the WWTP's influent pump station

Wastewater Treatment Plant Summary Information

Bldg No. / Location

Bldg. 304 - WWTP Office and Lab Bldg. 305 - Storage Bldg.

Bldg. 307 - Chlorine/Sulfur Dioxide Bldg.

Bldg. 311 - Pump Room Bldg. 312 - Lime Silo

WWTP Design Capacity 1.2 MGD

Process Equipment Item or Treatment System Specification or Design Parameter Purpose Photos

Lift Station 600

Influent lift station constructed in 1941. Consists of three submersible pumps. Lift station has a macerator, manual bar screen, and an emergency power generator. It also has a Sensaphone autodialer along with visual and audible alarms.

See Sewage Lift Station Worksheet (Table A-5) for additional information.

Receives wastewater flow from the entire collection system and pumps it to the headworks for preliminary treatment.

Grit Chamber

23 feet long x 4.5 feet wide Water Depth: 5.5 feet Total Volume: 4,250 gallons Design HRT: 5 minutes

(2) Blowers and air diffusers Chain driven collection buckets Grit screw conveyer

The aerated grit chamber is used to remove large particulate matter through settling. As the grit accumulates on the bottom of the chamber, the chain driven collection baskets are used to collect the grit in the collection sump where the grit is conveyed out of the chamber by a grit screw conveyer.

Parshall Flume 12-inchs Used to measure flow rate of WWTP influent.

Located Between Aiken St. and Woodville Circle

Table A-12. Wastewater Treatment Plant Summary Information

Headworks and Preliminary Treatment

Process Equipment Item or Treatment System Specification or Design Parameter Purpose Photos

Table A-12. Wastewater Treatment Plant Summary Information

Equalization Basin

54 feet x 54 feet x 16.5 feet deep 350,000 gallons Designed to hold 8 hours of average daily flow

(2) 388 cfm centrifugal blowers Grid pumping and diffusion system

Tank provides aeration and mixing while lessening the effects caused by large hydraulic loads and high contaminant levels entering the treatment process.

Screw Lift Pump Station

(2) 18-inch sluice gates

(2) 1425-gpm screw pumps Variable motor speed control

Used to convey wastewater from the wet well located after the equalization basin to an open channel, which flows to the aeration basin splitter box.

Table A-12. Wastewater Treatment Plant Summary Information

Lime Feed Lime storage silo

Adds lime to open channel leading to aeration basins. The lime is used to provide alkalinity in the activated sludge process for sufficient nitrification, and also as a buffer to prevent the pH from falling below the levels allowed in the NPDES permit.

Aeration

Current loading:

Organic loading rate: 11.9 lb BOD/1,000 cubic feet HRT: 20 hours F/M Ratio: 0.05 lb BOD/lb ML VSS Principal design criteria:

Volume: 1.0 MG Hydraulic detention time: 2.0 hours Loading: 0.1 lbs BOD/lb/MLSS Lbs MLSS under aeration: 23,000-34,000

Performs biological treatment of organic wastes. The wastewater from the splitter box is fed to the three basins, where aeration is provided and the microorganisms in the wastewater and return activated sludge (RAS) reduce the organics load within the wastewater. The control of dissolved oxygen (DO) within the basins can be controlled by lowering and raising the wastewater levels to affect the way the aerator blades mix the liquid. If sufficient DO is not provided, the mixed liquor concentration must be lowered.

Aeration Basin Splitter Box Unavailable

Flow control box that distributes the wastewater to the three aeration basins. The wastewater is mixed with RAS before entering the aeration basins to provide the proper microorganisms needed to treat the wastewater.

Table A-12. Wastewater Treatment Plant Summary Information

Aeration Basin No.1 Rectangular 377,000 gallons (3)30-HP blowers

Performs biological treatment of organic wastes.

Aeration Basin No.2 Rectangular 377,000 gallons

(2) 40-HP blowers

Performs biological treatment of organic wastes.

Aeration Basin No.3 Circular 246,000 gallons 30-HP surface mechanical aerator

Performs biological treatment of organic wastes.

Clarifier Lift Station Unavailable Used to convey the effluent from the aeration tanks to a flow distribution box that splits the mixed liquor between the three clarifiers.

Table A-12. Wastewater Treatment Plant Summary Information

Secondary Clarifiers

Current Loading:

Solids loading rate: 13.2 lb TSS/square foot-day HRT: 3.7 hours Principal design criteria:

Design hydraulic loading: 415 gpd/square foot Weir overflow rate: 3639 gpd/ft Available surface area: 2,886 square feet Available volume: 183,600 gallons

The secondary clarifiers allow for settling of the biological material produced in the aeration basins. The treated wastewater overtops the weir on the perimeter of the tank and flows into the collection trough. The biological material settles to the bottom of the clarifier and is released to flow back to the aeration basin as RAS or to flow to the aerobic digesters as waste activated sludge (WAS) for further treatment.

Secondary Clarifier No.1

35 feet in diameter Side wide depth (SWD) of 8.5 feet Collection trough around perimeter on surface Telescopic valves on underflow

Settling of biological material produced in the aeration basins.

Secondary Clarifier No.2

35 feet in diameter SWD of 8.5 feet Collection trough around perimeter on surface Telescopic valves on underflow

Settling of biological material produced in the aeration basins.

Secondary Clarifier No.3

35 feet in diameter SWD of 8.5 feet Collection trough around perimeter on surface Telescopic valves on underflow

Settling of biological material produced in the aeration basins.

Table A-12. Wastewater Treatment Plant Summary Information

WAS Pump Station Unavailable WAS flows by gravity from the clarifiers to a wet well at the pump station and is pumped to the aerobic digesters

RAS Parshall Flume Unavailable Measures flow of RAS back to splitter box

Tertiary Filter Building

Filter bed depth: 3.67 feet 24 inches of anthracite 8 inches of sand 12 inches of graded gravel Precast filter bottom Backwash pump: 2,500-gpm Surface wash pump: 115-gpm Surface agitators Backwash: 3 times per 24 hours

The filters are used to polish the effluent and remove particulate matter that remains in the wastewater. The filters are cleaned using a backwash line and waste troughs on the surface. The backwash wastewater is then transferred to the washwater holding tank and then to the equalization basin. The backwash water source is provided from the old chlorine contact chamber.

Washwater Holding Tank Unavailable Backwash water from the filters is stored in the washwater holding tank. The washwater is then pumped to the equalization basin.

Table A-12. Wastewater Treatment Plant Summary Information

Chlorine Feed Building 12.5% Chlorine bleach is used to disinfect the effluent

Dechlorination Building Sodium Sulfit is used to dechlorinate the effluent

Chlorine Contact Tank

75.5 feet long x 11 feet wide x 8 feet deep Total capacity: 50,000 gallons HRT: 1 hour Chlorine diffuser Sulfur dioxide diffuser

The chlorine contact chamber is designed to provide a bypass around the tertiary filtration process. This will allow operation of the WWTP while the filtration system is offline.

Effluent Parshall Flume Unavailable Used to measure flow rate of WWTP effluent.

Aerobic Sludge Digestion and Sludge Handling

Total Volume: 195,000 gallons Current loading factor: 0.019lb TSS/cubic foot-day.

Aerobic conditions in the digesters provide an environment suitable for organics degradation. The organics reduction results in nutrients, inactive biomass and nonbiodegradable particulate organic material that must be disposed. This sludge is pumped to a storage silo where it is stored until it is removed by the City of Sumter.

Disinfection and Dechlorination

The chlorine is added at the influent of the contact chamber where at least 30 minutes of contact time is provided for disinfection. The sodium sulfite solution is added at the influent end of the Parshall Flume to remove the chlorine prior to discharge.

Table A-12. Wastewater Treatment Plant Summary Information

Aerobic Sludge Digester No.1

Surface area: 490 square feet 18 foot SWD Volume: 65,000 gallons Positive displacement blowers (250-cfm)

(12) Static tube aerators Decanting weir

Organics reduction and sludge stabilization

Aerobic Sludge Digester No.2

Surface area: 490 square feet 18 foot SWD Volume: 65,000 gallons Positive displacement blowers (250-cfm)

(12) Static tube aerators Decanting weir

Organics reduction and sludge stabilization

Aerobic Sludge Digester No.3

Surface area: 490 square feet 18 foot SWD Volume: 65,000 gallons Positive displacement blowers (250-cfm)

(12) Static tube aerators Decanting weir

Organics reduction and sludge stabilization

Digested Sludge Pump Station Unavailable Sludge is pumped into truck and transported to the City of Sumter's Pocotaligo River WWTP for disposal

Table A-12. Wastewater Treatment Plant Summary Information

Lime Silo Unavailable Lime used to stabilize sludge-presently not in use

Table A-12. Wastewater Treatment Plant Summary Information

Sludge Drying Beds

(4) Large drying beds: 65 feet long x 20 feet wide

(3) Smaller drying beds: 50 feet long x 20 feet wide 12 inches of sludge can be pumped onto each bed.

The drying beds are not routinely used by the WWTP.

Comment on the use of SCADA to operate the WWTP and describe the system capabilities

The WWTP uses a Sensaphone autodialer system to notify a contact at the WWTP and the Fire Department during emergency situations. The Sensaphone is limited in its application and monitors only a few locations at the WWTP. There is no SCADA system currently in use at the WWTP.

Comments

Table A-13. WWTP SCADA Details

1. A project has been recommended to install a SCADA system for the WWTP and lift stations to improve remote monitoring and operation of these systems.

Generator

WWTP

Component

Served

Power Rating

Stationary or Mobile?

Receptacle or Transfer

Switch Available?

Fuel Type and Tank Volume (Gals)

Is generator routinely exercised?

How often?

Photos

WWTP

Engine Generator Set

All WWTP Components 500 kW Stationary

Automatic Transfer Switch

Diesel;

200 gallons Monthly

Who is responsible for maintaining generators and providing fuel?

A-14. Generators that Service WWTP

CE Power Production

WWTP Laboratory

1. Total Suspended Solids (TSS)

3. pH

4. Dissolved Oxygen (DO)

5. Ammonia

6. Residual chlorine

7. Total Phosphorus

Comments

2. Samples are taken at the head works and at the effluent flume for monitoring. Parameters such as DO and pH are also measured through many of the processes.

Does the base WWTP operate a certified laboratory? Yes No

Analyses performed in house by WWTP personnel:

2. Biochemical Oxygen Demand (BOD)

1. Ammonia, TP and fecal coliform samples are analyzed by Shealy Environmental Lab.

Comment on the availability of wastewater system contingency response plans (CRP)

The base has a integrated contingency response plan last updated in 2017, which includes some wastewater collection and treatment components. The CRP includes methods for providing latrines in the event of collection or treatment failure. There is no mention of how to address the cause of the system failure. It is recommended that the base develop a comprehensive wastewater system CRP that contains procedures to follow in the event of a wastewater system emergency, such as a lift station failure, a SSO, or a sewer main break.

Comment on the base's implementation of periodic wastewater contingency response exercises

Comment on the level of emergency response training provided to CEOUW and Fire Department personnel

Comment on emergency personnel contact procedures There is always a member of CEOUW on call. The water system operator is considered the first responder. Standby personnel are required to carry a cell phone and a two-way radio.

Comment on the availability of spare parts for critical equipment CEOUW can access spare parts and equipment kept in a spare parts room.

The level of emergency response training provided to CEOUW personnel is relatively limited. Fire Department personnel are well trained and conduct exercises related to incidents such as hazardous material spills. The Fire Department is also trained to properly manage a chlorine gas incident at the WWTP. It is recommended that the base periodically perform joint emergency response exercises related to the wastewater system.

The exercises should involve all relevant parties.

Table A-15. Existing Wastewater System Contingency Response Procedures / Plans

Table A-15. Existing Wastewater System Contingency Response Procedures / Plans

Comment on the base's procedures for obtaining equipment during a wastewater system emergency

Portable generators are stored at Power Production; however, most of these units are designated for other uses during power outages. Spare parts and equipment not available on base can be purchased with the "Impact Card" at the Pipeline Supply Company.

Comment on the availability of mutual aid agreement or close relationship with neighboring wastewater systems

The City of Sumter provided a sewer truck to Shaw AFB in the past when the base needed assistance. A mutual aid agreement between the base and the City should be established if there is not one currently in place.

Comment on the availability of a secure location for critical personnel to meet and strategize to respond to wastewater system emergencies

Deploy to the primary assembly area when directed by the On-Scene Commander.

Operators Certification

Tony Quercia Class A Biological, Class A Physical / Chemical

Lucretia Green Class A Biological, Class A Physical / Chemical

- Flightline driver training -Force Protection Condition (FPCON) training -Systems Security Awareness Training and Education (SATE) -Fire Protection training

Table A-16. Operator Training and Certification

1.South Carolina Code of Regulations Chapter 51 establishes the requirements for the certifications listed in Table A-14. The Code is based on the Statutory Authority of 1976 Code Sections: 40-23-10, 40- 23-40.

2. In addition to plant operator certifications, the WWTP operators are required to have the following training:

HQ ACC CEOI completes an infrastructure program review of the installation approximately every three years.

The program review provides an overall assessment of the wastewater system and looks more specifically at collection and pumping. The program also makes recommendations for system upgrades and programs projects for future HQ ACC funding.

The base-level CEO identifies projects on an as needed basis. Projects are programmed into Tririga/NEX

GEN-IT.

Several I&I studies have been conducted to assess sources of I&I and inspect the sanitary sewer system.

Consequently, the base has had several wastewater rehabilitation projects, including upgrades of sewer lines, manholes, and lift stations, and is currently undergoing a project to rehabilitate sanitary sewer lines and reduce I&I.

Table A-17. Wastewater System Capital Improvement Details

Comment on the base's wastewater capital improvement and sustainability program

Comment on the overall wastewater O&M program

The overall wastewater system O&M program is adequate. The base uses a RWP to track all lift station inspections and any other maintenance. The program maintains separate lists of inspection requirements for each lift station. OWS and grease trap cleaning is handled by a local contractor.

Comment on wastewater collection system inspection and cleaning frequencies

Sewage lift stations are visually inspected daily by contractor O&M personnel. The visual and audible alarm systems are checked regularly. The base has a vactor truck to assist with regular cleaning and inspection of the lift stations.

Table A-18. Wastewater System O&M Details

Permit Name Permit Type Issuing Agency Permit

Owner Date

Issued Expiration

Date Purpose Discharge Point

NPDES General Permit for Storm Water Discharges Associated with Industrial Activity, Permit No.

SCR000000

General SCDHEC Bureau of Water Shaw AFB 22 Jul 04 31 Aug 22

Permit to authorize storm water discharges associated with industrial activity, except construction activity (industrial storm water), including discharges through a municipal separate storm water system, under conditions stated in the permit

Outfall 003 discharges to Mush Branch Creek to Pocotaligo River

Outfalls 004 & 005 discharge to Long Branch Creek to Pocotaligo River

NPDES Permit for Discharge to Surface Waters, Permit No.

SC0024970

Individual SCDHEC Bureau of Water Shaw AFB 23 Apr 03 31 May 08

Permit to authorize storm water discharge from a diked fuel storage containment area (Outfall

007) to receiving waters

Outfall 007 discharges to 003 watershed; this eventually discharges to a ditch to Mush Branch at outfall 003 and then to the Pocotaligo River

NPDES General Permit for Storm Water Discharges From Large and Small Construction Activities, Permit No. SCR100000

General SCDHEC Bureau of Water Shaw AFB 10 Feb 12 31 Dec 18

Permit to authorize storm water discharges from construction sites that disturb land greater than 1 acre.

All outfalls

Table A-19. Summary of Storm Water System Permit

Outfall Number Drainage Area Number Areas Served Receiving Waters Sampling Requirements Outfall Photos / Comments

007 007

Discharges storm water from a diked containment area around three JP-8 bulk storage tanks in POL yard

Area served: 1 acre

Mush Branch Creek to Pocotaligo River

Monitoring and reporting is required at this site by sampling in association with one occurrence per quarter. The following parameters shall be monitored:

Flow, Oils and Grease, total organic carbon (TOC), pH, Benzene, Ethylbenzene, Toluene, Xylenes.

Naphthalene, MTBE, Copper, Lead, and Toxicity. Outfall 007 receives storm water from a one acre area. The drains from the containment area and the storm water drop inlets in the surrounding yard all drain through a 48-in pipe to the south of the site and flow into an open vegetated ditch. A previous study indicates the presence of an OWS on the effluent from the site; however, this OWS has not been identified.

002 002

Northern most point on base; drains residential area, golf course, parking apron, and parts of the flight line; this outfall is listed in the 2003 SWPPP

Area served: 583 acres

Long Branch Creek to Pocotaligo River

Monitoring and reporting is required at this site by sampling in association with one occurrence twice per year. The following parameters shall be monitored:

BOD, Oils and Grease, COD, TSS, pH, total Kjeldahl nitrogen, total phosphorus, Acute Whole Effluent Toxicity, and Section 313 Water Priority Chemicals.

Outfalls 003 and 004 are under the same general permit as outfall 002 and have the same sampling requirements.

The stream leading to Outfall 002 enters an old OWS through a weir. There is a side channel that accepts overflow. The storm water that is treated in the OWS exits through a 64-in diameter pipe where it combines with the water that flows through the diversion channel. This flow is discharged through two 36-in x 72-in box culverts on the opposite side of the road.

003 003

Discharges storm water runoff from the south ditch containment area of the base through an oil/water separator

Area served: 587 acres

Mush Branch Creek to Pocotaligo River Same requirements as Outfall 002.

Storm water exits the base through two box culverts, each 5-ft x 11-ft. These culverts are fed by 51-in and 60-in diameter pipes that empty into an open area before the culverts.

Table A-20. Summary of Storm Water Drainage Areas, Outfalls, and Receiving Waters

Outfall Number Drainage Area Number Areas Served Receiving Waters Sampling Requirements Outfall Photos / Comments

Table A-20. Summary of Storm Water Drainage Areas, Outfalls, and Receiving Waters

004 004

Discharges storm water runoff from the east ditch containment area of the base

Area Served: 1,227 acres

Long Branch Creek to Pocotaligo River Same requirements as Outfalls 002.

Outfall 004 is located within a fenced area in the southeast corner of the base. The outfall consists of a metal grate covering two 36-in x 60-in box culverts.

005 005

Discharges storm water runoff from the northeast area of the base, mainly from the approach zone of the apron

Area served: 97 acres

Long Branch Creek to Pocotaligo River

Outfall 005 no longer requires monitoring. There are no industrial activities associated with this outfall.

Outfall 005 consists of a 36-in box culvert which passes under road and leaves the base in a ditch. A weir and manhole are located upstream of the road.

006 006

Discharges storm water runoff from areas on the northeast side of the base

Area served: 180 acres

Booth's Pond to Pocotaligo River

Outfall 006 no longer requires monitoring. There are no industrial activities associated with this outfall.

Outfall 006 consists of a concrete pipe with a concrete riser box to allow for the settling of sediment before exiting the base. A concrete channel leads to the effluent point.

Storm Drainage Lines and Lift Stations

Approximate total linear feet of storm sewer lines:

Are there any combined sewers? Yes No

Approximate number of storm sewer manholes:

Approximate total linear feet of drainage ditches:

Number of storm water lift stations:

166,265

1,500

66,275

Comments

One

5. A project is currently underway to convert the storm water drainage ditch that discharges to Outfall 003 into a piped system. The project would also involve replacing culverts and implementation of erosion control measures. This project is in response to two notices of violations (NOVs) associated with erosion and total suspended solids (TSS) problems at Outfall 003 (NOVs dated 6 Oct 94 and 17 Jan 96). Complicating factors are airfield hazard and bird aircraft strike hazard (BASH) issue due to an open ½ mile culvert. The NPDES General Permit requires that Shaw AFB adhere to best management practices (BMPs).

3. A storm water lift station is located in the basement of the Headquarters building.

4. Currently, sediment accumulation in storm water drainage swales and pipes is contributing to inadequate drainage during heavy rain events.

A project has been recommended to conduct a survey of the storm drainage system. The scope should include: identify locations with accumulated sediment and debris; dredge storm water drainage ditches and concrete swales; perform high-pressure cleaning and vacuuming of drainage pipes; and dispose of debris as needed.

Approximate number of storm sewer catch basins, curb inlets and drop inlets:

1. Estimates for the total length of storm drainage lines and the total number of manholes, inlets, and drainage ditches at Shaw AFB are based on the GIS data provided by the base GeoBase office.

2. Less than half of the storm drainage line attributes are known. Pipe types include vitrified clay, reinforced concrete, corrugated metal, and cast iron. Pipes diameters range is size from 6 to 72 inches.

Communication

How do wastewater system personnel communicate with each other on a daily basis?

Two-way hand-held radios Email

Cell phones Base phone network

Pagers Other ____________________

Is there an internal emergency notification hierarchy? Yes No

Programmed, Funded, Completed, and Other Recommended Wastewater and Storm Water System Projects

Project Description of Work Status Actual or Projected Completion Date Comments

Infiltration and Inflow Project Evaluation Report

I & I study of WW collection system on the main base. Flow monitoring and manhole inspections were conducted to gather information on the system post-rehabilitation. This information was compared with the information compiled in the pre-rehabilitation study.

Complete 2010, 2018

Table A-22. Sanitary Sewer Studies

The following table presents a list of sanitary sewer studies that were completed, awarded, or programmed prior to the Wastewater and Storm Water System Evaluation.

Completion Date Comments

Replace 2 MFH pump stations 2 pump stations replaced Active 2012

Repair Sewer Collection Connected facilities to sanitary sewer system;

removed/abandoned septic tanks. Active 2012-2015

Table A-23. Collection and Pumping System Upgrades

The following table presents a list of sanitary sewer collection and pumping system upgrades that were completed, awarded, or programmed prior to the Wastewater and Storm Water System Evaluation.

Completion Date Comments

Repair WWTP Project to repair multiple WWTP components. Active 2012 VLSB-11-0034

I & I Rehab on base Project to repair manholes and sewer lines Active 2014-2016 VLSB-14-0073, 15 and 16-0073

Table A-25. WWTP Process / Component Upgrades

The following table presents a list of WWTP process / component upgrades that were completed, awarded, or programmed prior to the Wastewater and Storm Water System Evaluation.

Programmed, Funded, and Completed Wastewater and Storm Water System Projects

Completion Date Notes

Table A-26. Storm Water System Projects

The following table presents a list of storm water studies that were completed, awarded, or programmed prior to the Wastewater and Storm Water System Evaluation.