REMEDIATION ENHANCEMENT WITH HYDRAULIC SOIL FRACTURING

Jim FrereKennesaw - S&ME

2015 AIPG Conference

Hydraulic Soil Fracturing

• Benefits• Fracturing Process• Installation and Utilization• 2 Examples of Pilot Testing and Full

Scale Implementation

2015 AIPG Conference

Hydraulic Soil Fracturing

• BENEFITS -• Enhances AS/SVE, ChemOx, Bioremediation• Reduces cost

• Eliminating additional wells• Increased mass contaminant removal• Not limited to shallow depths

• Low pressures, uplift monitoring

2015 AIPG Conference

Hydraulic Soil Fracturing• Not Shale Oil/Gas

Fracturing at depth of1,000+ ft.

2015 AIPG Conference

2015 AIPG Conference

43.5psi

29  psi

58psi

2015 AIPG Conference

2015 AIPG Conference

2015 AIPG Conference

2015 AIPG Conference

2015 AIPG Conference

2015 AIPG Conference

2015 AIPG Conference

ChemOx, Bio‐Remediation, Air Sparging

2015 AIPG Conference

2015 AIPG Conference

2015 AIPG Conference

Chemical Distribution Facility• Low Permeability Soils – South

Georgia• Depth to Groundwater – 3

feet• PCE/TCE contaminants• AS/SVE not applicable• Excavation not appropriate –

active facility• Fracture one location at 5

depths (8 – 24 ft )o Approximately 1,000 lbs. sand

per fracture

2015 AIPG Conference

PILOT TEST AREA

2015 AIPG Conference

AOC‐1

2015 AIPG Conference

2015 AIPG Conference

Food Grade Cross‐ linked Guar

2015 AIPG Conference

Guar with sand and enzyme to break guar gel

2015 AIPG Conference

Hydraulic Fracturing with guar and sand

Four permanganate injection points up gradient of  monitoring wells

2015 AIPG Conference

Low Pressure 10% KMnO4 Injection – Approximately 100 gallons per injection well

Manifold  for four (4) KMnO4 injection wells

2015 AIPG Conference

2015 AIPG Conference

2015 AIPG Conference

Summary of PT

• Reduction of PCE in groundwater of shallow residuumo 24,000 ug/L to 4,000 ug/Lo Total VOCs from 45,000 ug/L to 8,000 ug/L

• Reduction of PCE in groundwater deep residuumo 20 ug/L to non-detecto Total VOCs increased from 100 ug/L to 4,000 ug/L

2015 AIPG Conference

PT and Full Scale – Warren AFBTreatment for TCE GW Plume

• Predesign testing – bench scale U of WYo Natural Oxidant Demand

• Pilot Testing 12/04 – 3 locations –one fracture eacho 1,200 lbs. KMnO4 per fracture

(Slurry)o Confirmation borings 1 week

after/3 month after fracturing

2015 AIPG Conference

Warren AFB TCE Plume Map

2015 AIPG Conference

2015 AIPG Conference

2015 AIPG Conference

2015 AIPG Conference

2015 AIPG Conference

2015 AIPG Conference

2015 AIPG Conference

H&S – Splash face screen‐ Splash Apron‐ Hard Hat‐ Rubber/Nitrile gloves‐ Tyvek® Coveralls

2015 AIPG Conference

2015 AIPG Conference

Summary

• Permanganate diffusion from fracture approximately 2 feet to 3 feet in 2 years

• Full scale implementation performance better than pilot test.o 9 locations with 4-5 fractures each (40 fractures -

40,000 lbs. of KMnO4 slurry)o 15 to 20 feet radius of fracture

• 24% cost reduction from using additional vertical wells

2015 AIPG Conference

Summary

• Reduction in TCE Groundwater Concentrations –50% - 95% in two years

• Rebound – 10% to 30%• Mass Contaminant Reduction Approx. 50 – 75%• Total Project Cost for Full Scale Implementation (40

Fractures) and Confirmation Borings - $ 200,000• $ 150,000 – add’l monitoring wells/analytical