EABSlides Sept 2007robinseab.org/Documents/EABSlides_Sept_2007.pdf · ACRONYMS & ABBREVIATIONS LF04 – Landfill Number 4 PBC – Performance Based Contract RPO – Remedial Process

Welcome

Environmental Advisory Board Meeting

Robins Air Force BaseSeptember 13, 2007

Welcome and Program Introduction

Dr. Linda SmythEAB Community Co-chair

ACRONYMS & ABBREVIATIONS

GWTP – Groundwater Treatment PlantGTWS – Groundwater Treatment SystemI & I – Inflow and InfiltrationIWCA – Industrial Wastewater Collection AreaIWCS – Industrial Wastewater Collection SystemLCS – Leachate Collection SystemLF03 – Landfill Number 3

ACRONYMS & ABBREVIATIONS

LF04 – Landfill Number 4PBC – Performance Based ContractRPO – Remedial Process OptimizationSSCA - Sanitary Sewer Collection AreaSSCS - Sanitary Sewage Collection System SVE – Soil Vapor ExtractionTCE – Trichloroethylene or TrichloroetheneVOC – Volatile Organic Compound

Environmental Advisory Board

Remedial Process Optimization of the

Groundwater Treatment System

Mr. David Sanders, P.G.Earth Tech, Inc.

September 13, 2007

OVERVIEW

Groundwater Treatment System (GWTS) ProcessPerformance-Based Contract (PBC)Performance MetricsExamples of RPOSummary

GWTS PROCESS

Award-winning GWTS team

Groundwater Treatment Plant (GWTP)

AWARDS IN 2006Georgia Association of Water Professionals -Plant of the Year Gold Award

GWTS PROCESS

Groundwater is pumped from wells at five remote sites

Groundwater is received at the GWTP through double-walled force main piping

GWTP also receives water from a rinse pad and by direct delivery

GWTS PROCESS

Treatment process involves:• Clarification• Equalization• pH adjustment• Filtration• Chemical/ultraviolet oxidation• Granular activated carbon• Neutralization• Discharge monitoring

PERFORMANCE-BASED CONTRACT

RPO - systematic evaluation and enhancement of site remediation processes to ensure:• Human health and the environment are protected• Risk and cost are minimized

PBC specifies the end results

Success is based on achievement of pre-determined metrics and milestones

PERFORMANCE-BASED CONTRACT

Metrics:

• GWTP run time• Influent flow rate• TCE and VOC mass removal• Discharge permit compliance• Maintenance inspections• Housekeeping inspections• Corrective Action Plan compliance• Site equipment run time

Well Rehabilitation

PERFORMANCE METRICS

Historical Flow TotalsGWTS Remediation Sites Annual Flow Totals (October 1997 - November 2006)

0

50

100

150

200

250

300

350Dec

05 - N

ov 06

Dec 04

- Nov

05

Dec 03

- Nov

04

Dec 02

- Nov

03

Dec 01

- Nov

02

Dec 00

- Nov

01

Dec 99

- Nov

00

Dec 98

- Nov

99

Oct 97

- Nov

98

Ann

ual F

low

Tot

als

in M

illio

n G

allo

ns (M

gal)

PERFORMANCE METRICS

Historical Mass RemovalHistorical Cumulative Mass Removal Estimates for

GWTS Remediation Sites

0

2,000

4,000

6,000

8,000

10,000

12,000

14,000

16,000

18,000

20,000

Dec 05 - N

ov 06

Dec 04 - N

ov 05

Dec 03 - N

ov 04

Dec 02 - N

ov 03

Dec 01 - N

ov 02

Dec 00 - N

ov 01

Dec 99 - N

ov 00

Dec 98 - N

ov 99

Oct 97 - N

ov 98

Cum

ulat

ive

Tota

l Org

anic

s M

ass

Rem

oved

(lb

s)

EXAMPLES OF RPO

Adjustments to Extraction Wells:

• Raising or lowering pumps• Installing larger or smaller pumps• Adjusting valve openings• Adjusting transducer settings for measuring water

levels• Rehabilitation

Flow meter readout in gpm

EXAMPLES OF RPO

Installing Larger Pumps

EXAMPLES OF RPO

Extraction Well Rehabilitation

EXAMPLES OF RPO

Operation of Treatment Plant:

• Evaluations of aging equipment• Remote monitoring of restoration sites• Reconfiguration of piping• TCE Analyzer

GWTS process schematic

EXAMPLES OF RPO

Operation of Treatment Plant Examples• Reconfiguration of Piping

EXAMPLES OF RPO

Operation of Treatment Plant Examples• TCE Analyzer

GWTP laboratory

EXAMPLES OF RPO

Shutdown of Landfill Number 4 (LF04) Extraction Wells

EXAMPLES OF RPO

Soil Vapor Extraction (SVE)/Leachate Collection System (LCS) at Landfill Number 3 (LF03)

Landfill gas flareLCS well vault

SUMMARY

GWTS RPO efforts proactively enhance site cleanup

Award-winning performance is minimizing environmental risk and long- term cost

Optimization leads to success

Environmental Advisory Board

Basewide Industrial and Sanitary Sewer Rehabilitation

Plan

Mr. Russell AdamsWater Quality Program Manager

September 13, 2007

OVERVIEW

Industrial/Sanitary Sewer Collection SystemInflow and Infiltration (I & I) TerminologyImpact of I & I on Sewer SystemProject ApproachField Survey ResultsSewer Rehabilitation PlanSummary

INDUSTRIAL/SANITARY SEWER COLLECTION SYSTEM

Aging system requires improvements• 50 percent of system piping installed between 1940

and 1960• 15 percent of system piping installed between 1960

and 1980• 60 miles of collection system piping

Map of Industrial and Sanitary Sewer Systems

Sanitary Sewer Industrial Sewer

I & I TERMINOLOGY

Inflow is surface water that enters a collection system through:• Roof leaders• Area and foundation drains• Manhole covers• Storm sewer cross connections

Infiltration is groundwater that enters a collection system through:• Defective pipes• Joints/connections• Manholes/pump stations

I & I TERMINOLOGY - EXAMPLES

Directional boring through sewer main


Joint failure in sewer pipe


Sewer pipe infiltration

IMPACT of I & I on SEWER SYSTEM

Capital expenditure for infrastructure improvements increases• Larger pipes and pumping equipment needed• Additional capacity for treatment plant process

facilities requiredMaintenance and chemical addition costs increase“Washout” can occur at treatment plants

PROJECT APPROACH

Objective• Identify extent of I & I and develop corrective actions

Performed field surveys• Manhole/pump station inspections • Flow monitoring• Smoke testing• Video inspections

Analyzed existing data• Water/wastewater records• Rainfall• Groundwater monitoring wells

PROJECT APPROACH

Industrial wastewater collection system (IWCS) subdivided into 4 areas• Defined as Industrial

Wastewater Collection Areas (IWCAs)

• Flow meters installed at downstream boundary locations

• Monitoring performed continuously for six months

Industrial Sewer Collection Areas 1 through 4

PROJECT APPROACH

Sanitary Sewage Collection System (SSCS) subdivided into 8 areas • Defined as Sanitary Sewer

Collection Areas (SSCAs)• Flow meters installed at

downstream boundary locations

• Monitoring performed continuously for six months Sanitary Sewer Collection

Areas 1 through 6

FIELD SURVEY RESULTS

Manhole/pump station inspections• Evaluated condition of

over 800 manholes─ Half require inflow protection

for covers─ 20 percent are overloaded

• Evaluated condition of 71 pump stations─ One-third require sealing of

pipe penetrations


Flow monitoring• Determined I & I

magnitude for IWCS─ 72 percent of infiltration and

86 percent of inflow comes from IWCA #2 and #4

Industrial Sewer Collection Areas


Flow monitoring• Determined I & I

magnitude for SSCS─ 66 percent of infiltration and

75 percent of inflow comes from SSCA #4, #5C, and #6

Sanitary Sewer Collection Areas


Smoke testing• Identified potential

sources of inflow• More than 30 deficiencies

were noted in IWCS and over 50 in SSCS

• Majority of deficiencies are in the Base Industrial Area


Video inspection• 225,000 feet inspected

(~40 miles) • Identified defects• Root intrusion found in

7,000 feet of sewers• 4,000 feet of pipe and

liner require replacement

SEWER REHABILITATION PLAN

Objectives• Recommend corrective

actions to reduce I & I• Develop/present

economic justification• Prioritize corrective

actions• Develop long-range

infrastructure planWastewater lift station


5-year plan• Specific repairs for IWCS

and SSCS components identified and prioritized

• Estimated total capital cost of rehabilitation ~ $1.1 Million

• Annually inspect 10 percent of sewer system manholes, pipes, and pump stations

Typical manhole


Long-range infrastructure planning• Use results of annual

inspections─ determine future capital costs─ prioritize largest I & I

contributors─ implement actions

• Develop hydraulic model to help predict impact of future development

Industrial wastewater facility


Hydraulic model• Prepared hydraulic models

for IWCS and SSCS─ Purchased an ArcGIS-based

computer program─ Integrated existing data from

Base GIS (maps, etc) with information collected during field surveys


N

KEY----- 0-50%----- 50-75%----- >75%

Peak day flow rates, 2.33”rainfall event on 7/29/2006 (SSCS)

SUMMARY

Field surveys confirmed extensive I & I exists Contributing sources were identifiedRehabilitation plan developed • Corrective action recommendations prioritized• Five-year plan developed to inspect, maintain, and

repair system• Long range infrastructure planning will predict

impact of future development and secure fundsContinued proactive approach will ensure functional system

New Businessand

Program Closing

Dr. Linda SmythEAB Community Co-chair

Next EAB Meeting

January 10, 2008

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