GEOPROBE TAYLOR FERGUSON What is a Geoprobe A

GEOPROBE TAYLOR FERGUSON

What is a Geoprobe A Geoprobe is a hydraulically-powered, direct push machine that uses static force as well as dynamic percussion force to drive steel boring rods into the sub-surface at a variety of depths in order to assist in sub-surface sampling. The use of the direct push technique refers to tools being pushed into the ground without the use of drilling to remove soil or to make a path for the tool.

Direct Push & Rotary Rigs

Direct Push

Direct Push & Rotary Rig

Direct Push: Model 540 MT

Direct Push: 5410

Background of Geoprobe • Originated from Geotechnical • Clay • Bedrock • Other Material • Ex: Louisville/Ne w Albany Bridge

Geoprobe Functions Soil Core Sampling Soil Gas Sampling Groundwater Sampling Electrical Conductivity and Contaminant Logging Grouting/Plugging & Material Injection (bentnite clay)

Soil Core Sampling This is soil sampling at various depths (furthest can go is 100 ft) It allows for continuous core sampling, without cutting, and the machines are very mobile There are two types of core sampling Single Rod Systems Dual Tube Systems Unlikely but could be used to find crude oil in Penn. & KY

Soil Core Sampling

Single Rod v. Dual Tube • Single Rod • More efficient and less time consuming • Dual Tube • Dual rod allows for cased hole • Prevents cross contamination

How This Relates to Oil/Gas

Typical Gas Station

Fuel Tanks

Corrosion

Soil Gas Sampling This is used to find near-surface hydrothermal gas vapors This could show permeability or other types of activity

Old v. New

How This Relates to Oil/Gas

Groundwater Sampling Done to study water contamination Insert multiple wells to check recharge and flow in groundwater Depends on size of area Typically set three in a triangle Can be long term or short term

Groundwater Sampling

How This Relates to Oil/Gas

Keystone Pipeline

Animas River (Colorado)

Electrical Conductivity & Contaminant Logging Purpose To understand soil characteristics Electrical conductivity Higher conductivity: silts & clay Lower conductivity: sands & gravel Permeability Contamination Map subsurface area

Electrical Conductivity

How This Relates to Oil/Gas

Grouting/Plugging & Material Injection Grouting/Plugging Is simply filling in the hole That can mean filling in bore hole from soil/gas sampling or packing the bore hole to prevent cross contamination for monitoring well or material injection Material Injection Injecting material in order to neutralize contaminants Ex: Regenesis ORC (injects oxygen to allow bacteria to eat contaminant) and RPI Bos 200 (soaks up contaminant and then biodegrades)

GP 300

How This Relates

Conclusion A lives next to a gas station and notices gas is in his drinking water, A notifies the State and they fix immediate issue, State then notifies owner to remove tank and finish fixing problem, Owner can do this or face a lien on property that will not be removed until problem is fixed (force State can take depends on the State law) IN/KY-this problem TN-State can fix entire problem and just charge owner A tries to buy B’s property, does Phase 1 (look at property on paper and see if any issues i. e underground tanks), Phase 2 (See if actual problem i. e. contamination), Phase 3 (do remediation to remove contamination) By law if contamination, must notify State but usually just negotiate the $ difference in contract This can backfire if a 3 rd party (i. e. neighbor) and finds contamination, he then notifies State and State will be mad and take harsher action