1 Fairbanks Disposal Pit Wm. Gordon Dean, PE Wm. Gordon Dean, PE Vice President, Engineering Vice President, Engineering WRS Infrastructure & Environment WRS Infrastructure & Environment Acknowledgments Acknowledgments Florida Department of Florida Department of T t ti Di t i t II T t ti Di t i t II Transportation, District II Transportation, District II John Collins, PE John Collins, PE Curtis Barnes Curtis Barnes Terry Zinn, Esq. Terry Zinn, Esq. SITE BACKGROUND SITE BACKGROUND 10 Acre Sand Borrow Pit 10 Acre Sand Borrow Pit Waste Disposal 1956 to 1982 Waste Disposal 1956 to 1982 Asphalt Testing Solvents Asphalt Testing Solvents 111 111 TCA Benzene TCE TCA Benzene TCE 1,1,1 1,1,1-TCA, Benzene, TCE TCA, Benzene, TCE Distillation/Recycling until 1978 Distillation/Recycling until 1978 Drums and Free Liquid Disposal Drums and Free Liquid Disposal PREVIOUS ACTIVITIES 1983 1983 - Removal of 1,046 drums Removal of 1,046 drums 1990 1990 - Removal of 345 drums Removal of 345 drums Limited soil removal Limited soil removal Groundwater assessment Groundwater assessment On On-site groundwater recovery system site groundwater recovery system RCRA closure permit application RCRA closure permit application PROJECT OBJECTIVES EPA CERCLA 106(a) ORDER EPA CERCLA 106(a) ORDER Issued December 1993 Issued December 1993 Obtain Clean Closure of Site Soils Obtain Clean Closure of Site Soils Complete Home Well Complete Home Well Abandonment and Replacement Abandonment and Replacement Program Program Design and Implement a Groundwater Design and Implement a Groundwater Treatment System(s) Treatment System(s) GRU WELLFIELD LOCATION MAP SITE 3.22 km (2 MILE) RADIUS FROM SITE GRU PRODUCTION WELLS RADIUS FROM SITE GRU GAINESVILLE GAINESVILLE REGIONAL AIRPORT
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1
Fairbanks Disposal Pit
Wm. Gordon Dean, PEWm. Gordon Dean, PEVice President, EngineeringVice President, Engineering
Florida Department of Florida Department of T t ti Di t i t IIT t ti Di t i t IITransportation, District IITransportation, District IIJohn Collins, PEJohn Collins, PECurtis BarnesCurtis BarnesTerry Zinn, Esq.Terry Zinn, Esq.
SITE BACKGROUNDSITE BACKGROUND
10 Acre Sand Borrow Pit10 Acre Sand Borrow Pit Waste Disposal 1956 to 1982Waste Disposal 1956 to 1982 Asphalt Testing SolventsAsphalt Testing Solvents 1 1 11 1 1 TCA Benzene TCETCA Benzene TCE 1,1,11,1,1--TCA, Benzene, TCETCA, Benzene, TCE Distillation/Recycling until 1978Distillation/Recycling until 1978 Drums and Free Liquid DisposalDrums and Free Liquid Disposal
PREVIOUS ACTIVITIES
1983 1983 -- Removal of 1,046 drumsRemoval of 1,046 drums 1990 1990 -- Removal of 345 drumsRemoval of 345 drums Limited soil removalLimited soil removal Groundwater assessmentGroundwater assessment OnOn--site groundwater recovery systemsite groundwater recovery system RCRA closure permit applicationRCRA closure permit application
PROJECT OBJECTIVES
EPA CERCLA 106(a) ORDEREPA CERCLA 106(a) ORDER Issued December 1993Issued December 1993 Obtain Clean Closure of Site SoilsObtain Clean Closure of Site Soils Complete Home Well Complete Home Well
Abandonment and Replacement Abandonment and Replacement ProgramProgram
Design and Implement a Groundwater Design and Implement a Groundwater Treatment System(s)Treatment System(s)
GRU WELLFIELD LOCATION MAP
SITE
3.22 km (2 MILE) RADIUS FROM SITEGRU
PRODUCTION WELLS
RADIUS FROM SITEGRU
GAINESVILLE
GAINESVILLE REGIONAL AIRPORT
2
Soil Closure Program
PRE-EXISTING SITE CONDITIONS
GETTING STARTED
PUBLIC MEETINGS PUBLIC MEETINGS LAND SURVEYING LAND SURVEYING GEOPHYSICAL SURVEYINGGEOPHYSICAL SURVEYING GEOPHYSICAL SURVEYINGGEOPHYSICAL SURVEYING DRUM STORAGE DRUM STORAGE SITE CONSTRUCTIONSITE CONSTRUCTION
DD 35 T t l 5 H d35 T t l 5 H d Drums Drums -- 35 Total, 5 Hazardous 35 Total, 5 Hazardous Debris Debris --Concrete, Wood, MetalConcrete, Wood, Metal 1,024 Tons of RC70 Material1,024 Tons of RC70 Material
PROPERLY ABANDON WELLSPROPERLY ABANDON WELLS REPLACE WITH PROPERLY CONSTRUCTED REPLACE WITH PROPERLY CONSTRUCTED
WELL PER SELECTION CRITERIAWELL PER SELECTION CRITERIA RERE--SAMPLE WELL FOR TARGET COMPOUNDSSAMPLE WELL FOR TARGET COMPOUNDS VIDEO LOG WELL VIDEO LOG WELL
PROCESS
REPLACE PUMPS, TANKS, AND SYSTEM REPLACE PUMPS, TANKS, AND SYSTEM PIPING AND WIRING AND OBTAIN PIPING AND WIRING AND OBTAIN HOMEOWNER SIGNHOMEOWNER SIGN--OFFOFF
WELL ABANDONMENT
EACH WELL REVIEWED ON CASE BY CASE EACH WELL REVIEWED ON CASE BY CASE BASISBASIS Construction DetailsConstruction DetailsConstruction DetailsConstruction Details Groundwater Analytical ResultsGroundwater Analytical Results Geophysical Logging DataGeophysical Logging Data Well Location with Regard to Known Well Location with Regard to Known
ContaminationContamination
7
WELL ABANDONMENT
LICENSED WATER WELL CONTRACTOR:LICENSED WATER WELL CONTRACTOR: Pulled PermitsPulled Permits Complete Abandonment / Pressure GroutingComplete Abandonment / Pressure Grouting Complete Abandonment / Pressure GroutingComplete Abandonment / Pressure Grouting File Well Abandonment ReportsFile Well Abandonment Reports Goal was to Eliminate Cross Connections Goal was to Eliminate Cross Connections
Throughout the AreaThroughout the Area
WELL ABANDONMENT
WELL ABANDONMENT REPLACEMENT WELL PROGRAM
THIS AVOIDED “PROPERTY TAKING THIS AVOIDED “PROPERTY TAKING ISSUES”ISSUES”
SJRWMD MANDATED THAT NEW WELLSSJRWMD MANDATED THAT NEW WELLS SJRWMD MANDATED THAT NEW WELLS SJRWMD MANDATED THAT NEW WELLS WERE “AGRICULTURAL IRRIGATION USE WERE “AGRICULTURAL IRRIGATION USE ONLY”ONLY”
REPLACEMENT WELL PROGRAM
CONSTRUCTION GUIDELINESCONSTRUCTION GUIDELINES “Telescoped” Casing Construction “Telescoped” Casing Construction
MethodologyMethodologygygy Surface Casing Surface Casing -- 1212--inch Diameter Steel to inch Diameter Steel to
4040--80 Feet Below Land Surface (BLS)80 Feet Below Land Surface (BLS)
REPLACEMENT WELL PROGRAM
Secondary Casing Secondary Casing -- 88--inch Diameter Steel inch Diameter Steel From 100From 100--140 Feet BLS140 Feet BLS
Tertiary CasingTertiary Casing -- 44--inch Diameter PVC toinch Diameter PVC to Tertiary Casing Tertiary Casing 44 inch Diameter PVC to inch Diameter PVC to 180180--210 Feet BLS210 Feet BLS
Drilled Out For 30Drilled Out For 30--Foot Open Hole Foot Open Hole Interval in the Floridan Aquifer Interval in the Floridan Aquifer
Five to Eight Day Process, Per Well, Five to Eight Day Process, Per Well, Dependent Upon Many FactorsDependent Upon Many Factors
8
DRILL RIG IN OPERATION REPLACEMENT WELL SAMPLING
WELLS SAMPLED FOR EPA TARGET LISTWELLS SAMPLED FOR EPA TARGET LIST FLORIDAN AQUIFER CONTAMINATION FLORIDAN AQUIFER CONTAMINATION
MONITORED THROUGH RESULTSMONITORED THROUGH RESULTSMONITORED THROUGH RESULTSMONITORED THROUGH RESULTS
REPLACEMENT WELL COMPLETION
EACH WELL WAS VIDEO LOGGED WITH THE EACH WELL WAS VIDEO LOGGED WITH THE STATE OF THE ART FDOT LOGGING VEHICLESTATE OF THE ART FDOT LOGGING VEHICLE
THE CUSTODY OF EACH WELL WAS THE CUSTODY OF EACH WELL WAS TRANSFERRED TO THE HOMEOWNER VIA THE TRANSFERRED TO THE HOMEOWNER VIA THE “RELEASE OF LIABILITY FORM”“RELEASE OF LIABILITY FORM”
COMPLETED WELL SETUP
COMPLETED WELL SETUP SUMMARY OF RESULTS
344 SIGNED PERMISSIONS344 SIGNED PERMISSIONS 333 WELLS LOGGED333 WELLS LOGGED 250+ WELLS SAMPLED250+ WELLS SAMPLED 181 WELLS ABANDONED181 WELLS ABANDONED 121 NEW WELLS INSTALLED AND SAMPLED121 NEW WELLS INSTALLED AND SAMPLED 6 OLD HOME WELLS LEFT FOR MONITORING 6 OLD HOME WELLS LEFT FOR MONITORING
PURPOSESPURPOSES
9
HOMEWELL LOCATION MAP
HATCHET CREEK
FLOOD PLAIN LIMIT
1.61 km (1 MILE) RADIUS FROM SITE
KNOWN DOMESTIC WELL LOCATION (TYPICAL)
SITE
N.E
. 39t
h S
T
REPLACEMENT WELL LOCATION MAP
HATCHET CREEK
FLOOD PLAIN LIMIT
1.61 km (1 MILE) RADIUS FROM SITE
REPLACEMENT WELL LOCATION (TYPICAL)
SITE
N.E
. 39t
h S
T
Groundwater Remediation
ProgramProgram
FOUR CONTAMINATED AQUIFERS
Surficial (0 to 60 Feet Deep)Surficial (0 to 60 Feet Deep) H1 (90 to 120 Feet Deep)H1 (90 to 120 Feet Deep) H2 (170 to 190 Feet Deep)H2 (170 to 190 Feet Deep) H2 (170 to 190 Feet Deep)H2 (170 to 190 Feet Deep) Floridan (200+ Feet Deep)Floridan (200+ Feet Deep)
AQUIFER PROFILE
150’
175’
100’
SURFICIAL AQUIFER
UPPER HAWTHORN
BURIED DRUMS
FAIRBANKS DISPOSAL PIT HATCHET
CREEK
WELLS
50’
0’
-50’
SEMI-CONFINING UNIT
UPPER INTERMEDIATE
AQUIFER
LOWER HAWTHORN
CONFINING UNIT
HAWTHORN BASAL CLAYFLORIDAN AQUIFER
OCALA GROUP
SURFICIAL AQUIFER CONTAMINATION
About 70 Acres North of Pit to Hatchet About 70 Acres North of Pit to Hatchet CreekCreek
Fairly tight sedimentary deposits withFairly tight sedimentary deposits with Fairly tight sedimentary deposits with Fairly tight sedimentary deposits with karst featureskarst features
No contamination identified below 35 feetNo contamination identified below 35 feet 261 ppb 1,1261 ppb 1,1--DCE and 241 ppb TCEDCE and 241 ppb TCE
10
SURFICIAL AQUIFER REMEDIATION
400+ Vertical Recovery Wells400+ Vertical Recovery Wells 600+ Air Sparging and VES Wells600+ Air Sparging and VES Wells Horizontal Recovery TrenchesHorizontal Recovery Trenches Horizontal Recovery TrenchesHorizontal Recovery Trenches
SURFICIAL AQUIFER REMEDIATION
14 Trenches, Each 300 Feet Long14 Trenches, Each 300 Feet Long 26 Feet Below Water Table26 Feet Below Water Table One Pass InstallationOne Pass Installation One Pass InstallationOne Pass Installation 4 Air Stripping Towers4 Air Stripping Towers NPDES Discharge to PondNPDES Discharge to Pond
SURFICIAL 1,1-DCE PLUME vs TRENCH LOCATIONS
HATCHET CREEK
1.28 ppb 1 1 DCE
TYPICAL RECOVERY TRENCH
7 ppb 1,1 DCE
1,1 DCE
SITE
RECOVERY TRENCH DETAIL
11
H1 AQUIFER CONTAMINATION
0.5 Miles North to 1.5 Miles Southwest of 0.5 Miles North to 1.5 Miles Southwest of PitPit
2 Vertical Recovery Wells2 Vertical Recovery Wells Air Stripping TowersAir Stripping Towers 4 Injection Wells4 Injection Wells 4 Injection Wells4 Injection Wells One injection Well Converted to Recovery One injection Well Converted to Recovery
WellWell
H1 1,1-DCE PLUME vs. H1 RECOVERY WELL LOCATIONS
H1RW-1
H1RW-3
H1RW-2
HW-34
SITE
>1.28 ppb 1,1-DCE
>7 ppb 1,1-DCE
H2 AQUIFER CONTAMINATION
Hatchet Creek to 1,000 Feet South of Pit Hatchet Creek to 1,000 Feet South of Pit and Isolated Area to Eastand Isolated Area to East
SEPTEMBER 1998 DATA ALL BELOW GPSSEPTEMBER 1998 DATA ALL BELOW GPS
H2RW-4
N
H2RW-1
H2-11
LEGEND
H2 RECOVERY WELL LOCATION
NOT TO SCALE
N.E. 77TH AVE.
LEGEND
H2 RECOVERY WELL LOCATION
NOT TO SCALE
H1 AQUIFER
TREATMENT BEGAN: FEBRUARY 1, 1996TREATMENT BEGAN: FEBRUARY 1, 1996 VOLUME OF WATER TREATED AS OF 7VOLUME OF WATER TREATED AS OF 7--3131--00: 00:
432.10 MILLION GALLONS432.10 MILLION GALLONS SIGNIFICANT REDUCTION OF PLUMESIGNIFICANT REDUCTION OF PLUME CONTAMINATION PLUME CONTAINED TO FDOT CONTAMINATION PLUME CONTAINED TO FDOT
PROPERTY AND IMMEDIATE VICINITY, PLUS PROPERTY AND IMMEDIATE VICINITY, PLUS ISOLATED POCKETS SURROUNDING H1ISOLATED POCKETS SURROUNDING H1--53 AND 53 AND H1H1--5555
H1H1--2, H12, H1--46, AND HW46, AND HW--34 CONVERTED TO 34 CONVERTED TO TEMPORARY RECOVERY WELLS TEMPORARY RECOVERY WELLS
H1 AQUIFER
DYE TRACE STUDIES (STATIC AND DYNAMIC) DYE TRACE STUDIES (STATIC AND DYNAMIC) COMPLETEDCOMPLETED
INJECTION WELLS NORTH OF HATCHET CREEK INJECTION WELLS NORTH OF HATCHET CREEK WILL NOT BE USEDWILL NOT BE USED
PUMP TESTS COMPLETED ON H1PUMP TESTS COMPLETED ON H1--3 AND H13 AND H1--4646 HYDRAULIC CHARACTERISTICS CONSISTENT HYDRAULIC CHARACTERISTICS CONSISTENT
WITH PREVIOUS RESULTSWITH PREVIOUS RESULTS H1H1--46 CONVERTED TO RECOVERY WELL46 CONVERTED TO RECOVERY WELL
TREATMENT BEGAN: DECEMBER 8, 1995TREATMENT BEGAN: DECEMBER 8, 1995 VOLUME OF WATER TREATED AS OF 7VOLUME OF WATER TREATED AS OF 7--3131--00: 00:
342.69 MILLION GALLONS342.69 MILLION GALLONS SURFICIAL CONTAMINATION CONTAINED SURFICIAL CONTAMINATION CONTAINED
ENTIRELY WITHIN FDOT PROPERTY BOUNDARYENTIRELY WITHIN FDOT PROPERTY BOUNDARY ONLY TWO PERMITONLY TWO PERMIT--DESIGNATED WELLS (OUT DESIGNATED WELLS (OUT
OF 10) ABOVE GROUNDWATER PROTECTION OF 10) ABOVE GROUNDWATER PROTECTION STANDARDSSTANDARDS
SURFICIAL RECOVERY WELL DATA VS. SURFICIAL RECOVERY WELL DATA VS. CONCENTRATION PLOTSCONCENTRATION PLOTS
SURFICIAL SYSTEMSURFICIAL SYSTEM
TYPICAL RECOVERY
TYPICAL INJECTION WELL
EFFLUENT TO INJECTION WELLSCREEK
RECOVERY WELL
TYPICAL TREATMENT SYSTEM
HORIZONTAL TRENCH
EFFLUENT TO PONDEFFLUENT
TO PONDSSITE
SRW-4 TCE Concentration vs. Time
0
3
6
9
12
15
2/6/
96
3/13
/96
4/17
/96
5/21
/96
7/1/
96
8/7/
96
9/18
/96
10/2
2/96
11/2
5/96
12/3
0/96
2/3/
97
3/10
/97
4/14
/97
5/28
/97
9/15
/97
11/2
4/97
12/3
0/97
2/4/
98
5/4/
98
8/3/
98
10/5
/98
12/2
2/98
3/15
/99
Date
Co
nce
ntr
ati
on
(p
pb
)
GPS = 3 ppb
SRW-2 TCE Concentration vs. Time
0
6
12
18
24
30
2/6/
96
3/13
/96
4/17
/96
6/5/
96
7/10
/96
8/13
/96
9/24
/96
11/5
/96
12/1
0/96
1/14
/97
3/10
/98
7/21
/97
8/25
/97
10/2
1/97
12/1
/97
1/5/
98
2/17
/98
5/18
/98
9/8/
98
11/1
6/98
3/2/
99
Date
Co
nce
ntr
ati
on
(p
pb
)
GPS = 3 ppb
SRW-3 TCE Concentration vs. Time
0
3
6
9
12
15
2/6/
96
3/6/
96
4/3/
96
5/14
/96
6/18
/96
7/18
/96
8/13
/96
9/18
/96
10/1
5/96
11/1
2/96
12/1
0/96
1/7/
97
3/3/
97
3/31
/97
4/29
/97
10/2
8/97
11/2
4/97
12/2
2/97
1/20
/98
3/2/
98
6/15
/98
9/22
/98
12/2
2/98
3/15
/99
Date
Co
nce
ntr
ati
on
(p
pb
)
GPS = 3 ppb
GEOPROBE ACTIVITIES
TREATMENT SYSTEM DATA EVALUATION TREATMENT SYSTEM DATA EVALUATION INDICATED LIKLIHOOD OF UNIDENTIFIED INDICATED LIKLIHOOD OF UNIDENTIFIED SOURCESSOURCES
FIRST SAMPLES FROM TOP OF WATER TABLE FIRST SAMPLES FROM TOP OF WATER TABLE --CLEANCLEAN
SECOND SAMPLES FROM 25 TO 29 FEET BLS SECOND SAMPLES FROM 25 TO 29 FEET BLS --PRIMARILY CLEANPRIMARILY CLEAN
SAMPLES FROM TOP OF CLAY (34 TO 39 FEET SAMPLES FROM TOP OF CLAY (34 TO 39 FEET BLS) BLS) -- POSSIBLE DNAPLPOSSIBLE DNAPL
16
GEOPROBE ACTIVITIES
OVER 650 GEOPROBE BORINGS TO COLLECT OVER 650 GEOPROBE BORINGS TO COLLECT GROUNDWATER SAMPLESGROUNDWATER SAMPLES
7 UW BORINGS FOR DETAILED VERTICAL 7 UW BORINGS FOR DETAILED VERTICAL LITHOLOGIC AND ANALYTICAL PROFILE IN LITHOLOGIC AND ANALYTICAL PROFILE IN SOURCE AREASSOURCE AREAS
3 ROTOSONIC WELLS3 ROTOSONIC WELLS WATERLOO SAMPLER FOR DETAILED VERTICAL WATERLOO SAMPLER FOR DETAILED VERTICAL
GROUNDWATER PROFILEGROUNDWATER PROFILE
WHAT DO WE DO NOW?WHAT DO WE DO NOW?
Technology EvaluationTechnology Evaluation-- Insitu Chemical OxidationInsitu Chemical Oxidation-- Insitu Thermal Insitu Thermal
-- ExcavationExcavation--Excavation with SheetpileExcavation with Sheetpile--Open hole ExcavationOpen hole Excavation
Pilot Study Evaluation
Evaluated InEvaluated In--Situ Oxidation and InSitu Oxidation and In--Situ Situ Thermal Technologies for Pilot TestingThermal Technologies for Pilot Testing 70 foot by 70 foot area in potential source70 foot by 70 foot area in potential source70 foot by 70 foot area in potential source 70 foot by 70 foot area in potential source
areaarea Approximately 40 feet deepApproximately 40 feet deep
Pilot Study Evaluation
InIn--Situ OxidationSitu Oxidation Fenton’s ProcessFenton’s Process
Current Environmental Systems, Inc.Current Environmental Systems, Inc.Current Environmental Systems, Inc.Current Environmental Systems, Inc.
Pilot Study Evaluation
Bid Results: InBid Results: In--Situ Thermal HeatingSitu Thermal Heating Approximately $600K for pilot study ($65/yd.)Approximately $600K for pilot study ($65/yd.) Differs significantly from commonly publishedDiffers significantly from commonly published Differs significantly from commonly published Differs significantly from commonly published
results ($32/yd.)results ($32/yd.)
Remedial ApproachRemedial Approach
Work Plan Development under PerformanceWork Plan Development under Performance--Based permitBased permit-- Excavate to UTS or Residential Excavate to UTS or Residential
Standards (whichever is more stringent)Standards (whichever is more stringent)Standards (whichever is more stringent)Standards (whichever is more stringent)-- On site treatment of excavated soilsOn site treatment of excavated soils-- Cleanup excavated soils to State Cleanup excavated soils to State
Leachability goalsLeachability goals
Excavation Activities Excavation Activities --Overburden, 0 to 20 ft Overburden, 0 to 20 ft Overburden Removal Overburden Removal
Began Overburden Removal October 2001 Began Overburden Removal October 2001 and completed December 2001.and completed December 2001.
DewateringDewatering -- Horizontal Trench InstalledHorizontal Trench Installed Dewatering Dewatering -- Horizontal Trench InstalledHorizontal Trench Installed Dewatering Activities began January 21, Dewatering Activities began January 21,
20022002
18
Excavation Activities Excavation Activities -- 20 to 30 20 to 30 feet BLSfeet BLS
Excavation of Soils below water table (20Excavation of Soils below water table (20--30 feet below land surface)30 feet below land surface)-- Initiated January 2002Initiated January 2002yy-- Interceptor Trench CutInterceptor Trench Cut
to Aid in Dewatering Activitiesto Aid in Dewatering Activities
Excavation ActivitiesExcavation Activities
Excavation ActivitiesExcavation Activities Observation of DNAPLObservation of DNAPL
DNAPL DNAPL encountered at encountered at approximately 34 approximately 34 feet below landfeet below landfeet below land feet below land surfacesurface
Observation of DNAPLObservation of DNAPL
DNAPL at ~34 feet DNAPL at ~34 feet below land surfacebelow land surface
Observation of DNAPLObservation of DNAPL
DNAPL in sand DNAPL in sand stringer at stringer at approximately 37 feet approximately 37 feet blblbls.bls.
19
DNAPL SAMPLEDNAPL SAMPLE
DNAPL separated into DNAPL separated into LNAPL and DNAPLLNAPL and DNAPL
EXEX--SITU SOIL VAPOR SITU SOIL VAPOR EXTRACTION PLANEXTRACTION PLAN
Rotary Trommel To Remove Debris And Rotary Trommel To Remove Debris And Regulate Particle SizeRegulate Particle Size
Sample Soils Sample Soils -- Clean Stockpile Or SVEClean Stockpile Or SVELi d P d I SWMU/WMALi d P d I SWMU/WMA Lined Pond In SWMU/WMALined Pond In SWMU/WMA
Addition of 5% Quick Lime If Needed To Addition of 5% Quick Lime If Needed To Improve Material Handling Of ClaysImprove Material Handling Of Clays
Treat To Florida Leachability SCTLs (Chapter Treat To Florida Leachability SCTLs (Chapter 6262--777, FAC)777, FAC)
Lined Pond(Soil Treatment Area)
SRW-1 SRW-2
ApproximateL ti f
ApproximateLocation of
Source Area 2
DewateringTreatment System
Soil Processing Area
FDOT Office
ApproximateLocation of
Source Area 3
Location ofSource Area 1
= Approximate location of apparent source material encountered during excavation activities.
WORK PLAN IMPLEMENTATIONWORK PLAN IMPLEMENTATION
Increasing Clay Content Clogged TrommelIncreasing Clay Content Clogged Trommel Added 5% Hydrated Lime Due To Health Added 5% Hydrated Lime Due To Health
And Safety ConcernsAnd Safety Concerns -- Minimal EffectMinimal EffectAnd Safety Concerns And Safety Concerns Minimal EffectMinimal Effect Added 5% Quick Lime Added 5% Quick Lime -- SuccessSuccess Clayey Soils Became Friable And NonClayey Soils Became Friable And Non--PlasticPlastic All Soil Concentrations Below Leachability All Soil Concentrations Below Leachability
SCTLsSCTLs Most Below Detection Limit Of 1 Most Below Detection Limit Of 1 g/kgg/kg Leachate Tests Below Detection LimitsLeachate Tests Below Detection Limits
CaO + Water CaO + Water Ca(OH)Ca(OH)22 + Heat+ Heat Calcium Reacts with Metals in Clay StructureCalcium Reacts with Metals in Clay Structure Very Plastic Clays (Plasticity Index GreaterVery Plastic Clays (Plasticity Index Greater Very Plastic Clays (Plasticity Index Greater Very Plastic Clays (Plasticity Index Greater
Than 50) Rendered NonThan 50) Rendered Non--PlasticPlastic Moisture Sensitivity Substantially ReducedMoisture Sensitivity Substantially Reduced Swell Potential Reduced From 8% To 10% Swell Potential Reduced From 8% To 10%
To Less Than 0.1%To Less Than 0.1%
WORKING WITH QUICK LIMEWORKING WITH QUICK LIME
Highly Exothermic Reaction With All Moisture Highly Exothermic Reaction With All Moisture -- Eyes, Lungs, Sweat, Etc.Eyes, Lungs, Sweat, Etc.
Reacts With Some OrganicsReacts With Some Organics -- Rubber HosesRubber Hoses Reacts With Some Organics Reacts With Some Organics Rubber Hoses Rubber Hoses On EquipmentOn Equipment
Appropriate PPE And Dust Control EssentialAppropriate PPE And Dust Control Essential FDA Approved Food AdditiveFDA Approved Food Additive $200 per 2,000 Pound Supersack$200 per 2,000 Pound Supersack
21
FINAL RESULTS AT FAIRBANKSFINAL RESULTS AT FAIRBANKS All Contaminated Soils Mixed With Quick All Contaminated Soils Mixed With Quick
LimeLime 18 Inch Lifts Using Large Road Mixer In 18 Inch Lifts Using Large Road Mixer In
Lined Soil Processing AreaLined Soil Processing Areagg Additional Quick Lime Mixing InAdditional Quick Lime Mixing In--Situ With Situ With
Back Hoe In DNAPL AreasBack Hoe In DNAPL Areas 11,500 Cubic Yards of Contaminated Soils 11,500 Cubic Yards of Contaminated Soils
Successfully Treated With Quick LimeSuccessfully Treated With Quick Lime Treated Soils Returned To ExcavationTreated Soils Returned To Excavation Unit Treatment Cost Less Than $30 Per Cubic Unit Treatment Cost Less Than $30 Per Cubic
YardYard
Confirmation SamplingConfirmation Sampling
Confirmation Sample CollectionConfirmation Sample Collection--Collected confirmation samples on10Collected confirmation samples on10--foot foot centers across excavation floorcenters across excavation floor
Any results above leachability goals triggered Any results above leachability goals triggered rere--excavationexcavation
Excavation activities completed March 2002Excavation activities completed March 2002
Fairbanks Disposal Pit After Fairbanks Disposal Pit After 2002 Excavation2002 Excavation
SURFICIAL SYSTEMSURFICIAL SYSTEM
TYPICAL RECOVERY
TYPICAL INJECTION WELL
EFFLUENT TO INJECTION WELLSCREEK
RECOVERY WELL
TYPICAL TREATMENT SYSTEM
HORIZONTAL TRENCH
EFFLUENT TO PONDEFFLUENT
TO PONDSSITE
Recovery Well Trend AnalysisRecovery Well Trend Analysis
SRW-2 1,1,1-TCA Concentrations vs. Time
(2001-Present)
400pp
b)
Source Removal Complete
0
100
200
300
1/8/
01
2/5/01
D
4/9/01
6/5/01
8/1/
01
10/2/0
1
12/5
/01
1/8/02
D
3/1/
02
5/6/02
7/8/02
Date
Co
ncen
tratio
n (p
MCL=200 ppb
22
Recovery Well Trend AnalysisRecovery Well Trend Analysis
SRW-2 1,1-DCE Concentration vs Time
(2001-Present)
300pp
b)
Source Removal Complete
050
1001502002503
1/8/01
2/5/
01D
4/9/
01
6/5/
01
8/1/
01
10/2
/01
12/5
/01
1/8/
02D
3/1/
02
5/6/
02
7/8/
02
Date
Co
nce
ntr
atio
n (p
MCL=7 ppb
Recovery Well Trend AnalysisRecovery Well Trend Analysis
SRW-2 TCE Concentrations vs Time
(2001-Present)
100
pp
b)
Source Removal Complete
0
20
40
60
80
1/8/01
2/5/
01D
4/9/
01
6/5/01
8/1/01
10/2/0
1
12/5
/01
1/8/
02D
3/1/
02
5/6/02
7/8/02
Date
Co
nce
ntr
atio
n (p
MCL=3 ppb
Excavation ConclusionsExcavation Conclusions
Excavation facilitated the ability to “chase” Excavation facilitated the ability to “chase” stringers and isolated areas of contaminationstringers and isolated areas of contamination
DNAPL found in sand stringers would have been DNAPL found in sand stringers would have been virtually impossible to address with othervirtually impossible to address with othervirtually impossible to address with other virtually impossible to address with other technologiestechnologies
With source materials removed, dissolved phase With source materials removed, dissolved phase contamination is expected to continue to contamination is expected to continue to decrease with timedecrease with time
1) determine location and severity of 1) determine location and severity of ) y) ypossible sinkhole featurespossible sinkhole features
2) determine possibility of relic sinkholes 2) determine possibility of relic sinkholes contributing to vertical migrationcontributing to vertical migration
3) compare results with 1994 D&M 3) compare results with 1994 D&M natural potential surveynatural potential survey
Current StatusCurrent Status
Cost Cap InsuranceCost Cap Insurance 10 Year Policy10 Year Policy Single FDOT PaymentSingle FDOT Payment Single FDOT PaymentSingle FDOT Payment Another Consultant Won Project in midAnother Consultant Won Project in mid--
20032003
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Wm. Gordon Dean, PEWm. Gordon Dean, PEWRS Infrastructure & WRS Infrastructure &
Environment, Inc.Environment, Inc.1650 Summit Lake Drive1650 Summit Lake Drive
Suite 202Suite 202Tallahassee, FL 32317Tallahassee, FL 32317