eabslides sept 2007robinseab.org/documents/eabslides_sept_2007.pdf · acronyms & abbreviations...
TRANSCRIPT
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
I & I TERMINOLOGY - EXAMPLES
Joint failure in sewer pipe
I & I TERMINOLOGY - EXAMPLES
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
FIELD SURVEY RESULTS
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
FIELD SURVEY RESULTS
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
FIELD SURVEY RESULTS
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
FIELD SURVEY RESULTS
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
SEWER REHABILITATION PLAN
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
SEWER REHABILITATION PLAN
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
SEWER REHABILITATION PLAN
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
SEWER REHABILITATION PLAN
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
Please…Complete the meeting evaluation and
feedback form
Leave your name tag and lanyard for the next meeting.
Thank you!