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GeoSierra LLC 1
Trenchless PRB Installation ProjectsTrenchless PRB Installation ProjectsKelly AFBKelly AFB -- San AntonioSan Antonio
Jim Ortman
GeoSierra Atlanta, GA
Website: www.geosierra.com
GeoSierra LLC 2
Kelly AFBKelly AFBPRB Project ScopePRB Project Scope
5 PRBs totaling 3,650’
2,100’ on 2-Lane City Streets
1,550’ Within An Active Railroad Right-of-Way
Average Depth – 20 ft bgs to 40 ft bgs
1,000 Tons of Iron
Complex site circumstances
Minimum Footprint Requirements
GeoSierra LLC 3
Drilling Frac Casing BoreholesDrilling Frac Casing Boreholes
GeoSierra LLC 4
QA/QC ProcessesQA/QC Processes
Bench Scale Treatability Column Test
Pre-Construction Hydraulic Pulse Interference Test
Probabilistic Design
Active Resistivity Imaging
Inclined Profile Resistivity or Magnetometer
Post-Construction Hydraulic Pulse Interference Test
Ongoing Gel and Iron QA/QC Tests
Ground Surface
GeoSierra LLC 5
Pre and PostPre and Post--ConstructionConstructionHydraulic Pulse Interference TestHydraulic Pulse Interference Test
Observation Wells
Source Well
Plugs
Packers
High Precision Pressure Tranducers
Iron Reactive Barrier
Hydraulic Source
GeoSierra LLC 6
Pulse Interference Setup and MonitoringPulse Interference Setup and Monitoring
GeoSierra LLC 7
Navigating Around UtilitiesNavigating Around Utilities
GeoSierra LLC 8
Handling and Logging CoresHandling and Logging Cores
GeoSierra LLC 9
Gravel and Cobbles GeologyGravel and Cobbles GeologyCity of San AntonioCity of San Antonio
GeoSierra LLC 10
Frac Casings and Iron FilingsFrac Casings and Iron Filings in Project Warehousein Project Warehouse
GeoSierra LLC 11
Aligning Feeder Pipe and Frac CasingAligning Feeder Pipe and Frac Casing
GeoSierra LLC 12
Setting and Aligning CasingSetting and Aligning Casing
GeoSierra LLC 13
Confirming Casing Alignment WithConfirming Casing Alignment WithDownhole Camera and CompassDownhole Camera and Compass
GeoSierra LLC 14
Surrounding Casing with Cement GroutSurrounding Casing with Cement Grout
GeoSierra LLC 15
Placing Resistivity StringPlacing Resistivity Stringat Same Depth as Frac Casingat Same Depth as Frac Casing
GeoSierra LLC 16
Frac Casings in Place Ready to FracFrac Casings in Place Ready to Frac
GeoSierra LLC 17
Frac Equipment FootprintFrac Equipment Footprint Tinker AFB Kelly AFBTinker AFB Kelly AFB
GeoSierra LLC 18
Iron Filings over Mixer Adding Iron to GelIron Filings over Mixer Adding Iron to Gel
GeoSierra LLC 19
RealReal--Time Active ResistivityTime Active ResistivityImage of Frac InjectionImage of Frac Injection
GeoSierra LLC20
Inclined Profile Soil Resistivity Inclined Profile Soil Resistivity Probe to Verify PRB Thickness Probe to Verify PRB Thickness
Soil ResistivityProbe
IronPRB
Inclined Length (feet)
Res
istiv
ity(o
hm-c
m)
30 31 32 33 34 35 36 370
500
1000
1500
2000
2500
3000
3500
4000
PRB IntersectionLength= 9.6”PRB Thickness= 4.8”
5
4
32
167
98
N
PulseWellPW-3at100-105'20gpmwith20secintervalPhase1Post-PRB 02/09/01
PulseWellPW-3at100'-105'20gpmwith20sec intervalPhase1Pre-PRB 11/04/00
GeoSierra LLC 21
Pre and Post Construction ComparisonsPre and Post Construction Comparisons Verify the Permeability of the PRBVerify the Permeability of the PRB
Time(mins)
Rec
eive
r Pre
ssur
e (p
si)
Sou
rce
Flow
Rat
e (g
pm)
0 0.25 0.5 0.75 10
0.025
0.05
0.075
0.1
0
10
20
30
40
50
60
70
80
90
100
PW-1 PW-4 PW-2 PW-3
Time(mins)
Rec
eive
r Pre
ssur
e (p
si)
Sou
rce
Flow
Rat
e (g
pm)
0 0.25 0.5 0.75 10
0.025
0.05
0.075
0.1
0
10
20
30
40
50
60
70
80
90
100
PW-1 PW-2 PW-4 PW-3
Pulse Well PW-3 at 100’ – 105’ 20 gpm with 20 sec. interval Phase 1 Pre-PRB 11/04/00
Pulse Well PW-3 at 100’ – 105’ 20 gpm with 20 sec. Interval Phase 1 Post-PRB 02/09/01
GeoSierra LLC 22
GeoSierra Installed PRBsGeoSierra Installed PRBs…Proven Technology…Proven Technology
Depth Length _______Site Name________ 65’ 360’ Caldwell Superfund Site - NJ
75’ 240’ McGraw Edison Superfund Site - IA
115’ 100’ DuPont - Oakley, CA
40’ 1200’ Arrowhead Superfund Site – VA
100’ 100’ BP - Gardena, CA
115’ 75’ Sierra Army Depot - Herlong, CA
95’ 500’ Tinker AFB – Oklahoma City
40’ 3650’ Kelly AFB (5 PRBs) Installation Underway
