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NGWA - Study Questions - Augering & Monitoring
Well
If decontamination procedures are not followed, what piece(s) of drill equipment is (are) most likely to contaminate a well? - โ โ 1. Drill rods.
- Augers.
- Samplers. The purpose for a double cased monitoring well would be... - โ โ ... to prevent migration of contamination between aquifers. Which of the following is usually added to cement grout to reduce shrinkage? - โ โ Bentonite. To protect against suspected dust, mist, fumes, and vapors, personnel should begin operations by having... - โ โ ... a filtration respirator. The site specific safety plan calls for level D PPE. Level D PPE includes... - โ โ Hard hat, safety glasses, steel toe shoes. When drilling monitoring wells in urban areas, which of the following should be taken into consideration? - โ โ 1. Access to drilling sites.
- Underground utilities.
- Overhead utilities.
Under what conditions will bentonite pellets not swell to their maximum size? - โ โ In highly mineralized water. How far can a well screen section be moved vertically after a filter pack and bentonite seal have been placed? - โ โ The length of the filter pack above the screen. The purpose of taking ground water samples while advancing the hole it... - โ โ ... to determine containment concentrations at specific intervals in the aquifer. What standard method is used for decontaminating equipment and materials DOES NOT belong? - โ โ Lubricate equipment with petroleum products after cleaning. Which of the following factors can alter the quality of a ground water sample taken from a monitoring well? - โ โ 1. Solvent used to weld PVC casing together.
- Improperly stored and handled casing.
- Drilling fluid. Which of the following is NOT true? - โ โ The SPT is performed by driving a standard sampler 9 inches into the soil using a 100 lb hammer. The most common use of a piezometer is... - โ โ ... for water quality sampling.
What is the method for removing sand that has entered the hollow-stem auger after you have drilled below the water table? - โ โ Wash the sand out with approved water. When the drill cuttings exceed the volume of the borehole while hollow-stem auger drilling, you have usually... - โ โ ... encountered flowing sand. Hollow-stem augers are commonly used to install wells because... - โ โ ... soil sampling is easy and accurate in most cases. Proper screen selection for a ground water monitoring well should include... - โ โ ... slot size matched to filter pack material. Of the methods listed, which is the best method of obtaining soil samples during the drilling of a monitoring well? - โ โ Using a Shelby tube and/or split spoon sampler. Monitoring wells used to sample ground water should always be... - โ โ 1. Installed with great care to avoid contamination from the drilling process
- Installed to protect the well from surface pollution.
- Protected with secure well protective covers. In order to establish project expectations, the drilling contractor should... - โ โ
- Request and review the statement of work.
- Discuss project specifics with the project manager.
- Outline the statement of work with the drill crew.
Observations made during performance of contract work at a drilling and monitoring site, such as unusual soil odor or color (of samples)... - โ โ ... are essentially the property of the person paying for the investigation and who has the responsibility to take action as necessary to protect the public. Federal Motor Carrier safety regulations require the driver of a CMV of 10,001 lbs. combined weight or over to have... - โ โ ... a medical card and valid driver's license. Personal protection requirements for working at a hazardous waste site are broken down in four levels A thru D with... - โ โ ... level A being the most protective. The document that specifically states what is to be accomplished on a projects is a(n)... - โ โ ... statement of work. A piezometer is... - โ โ ... an instrument placed in the ground water used to measure pressure (head). Hollow-stem auger drill rigs have many components which make up the drill rig. Which items are not generally part of the package? - โ โ Down the hole hammer and float sub. The primary item which dictates the type of drilling equipment to be used on a site is... - โ โ ... geology. The commonly used hollow-stem auger system for monitoring well installations...
- โ โ ... should include an auger head than can be machined to accent a plate that facilitates well installation below the ground water level.
The safety of operation of a hollow-stem auger drill rig is compromised when... - โ โ ... drilling operations occur closer than the 100' safety zone from an electrical line. Daily inspection of drilling equipment should include, but is not limited to... - โ โ Inspection of cable, hoses, etc. All fluid levels First aid kit available The drilling method used to construct a monitoring well should... - โ โ ... minimize disturbance of subsurface materials The "auger fork" is a device that slips through the flights of the auger column and... - โ โ ... keeps the augers from "sliding" back into the borehole when removing the augers from the borehole. For drilling operations at a hazardous waste site, the exclusion zone is... - โ โ ... the area on-site that is potentially contaminated and where workers must wear PPE as stipulated in the site specific health and safety plan. An advantage of using hollow-stem augers is... - โ โ ... no drilling fluid is used, eliminating contamination by drilling fluid additives. A disadvantage of using cable tool drilling for monitoring wells is... - โ โ ... possible problems in controlling heaving sands. Which of the following is not a standard industry term in the monitoring field? - โ โ Ping rods.
Tremie pipe or line is a device, usually a small diameter pipe or hose, that performs the following functions... - โ โ ... allows pressure grouting from the bottom of the hole without introduction of air pockets. The following method(s) is/are not commonly acceptable for well development. - โ โ The Haliburton method. When bentonite is used in drilling the borehole for constructing a monitoring well, which method is best for removing the bentonite from the screen area? - โ โ Using deflocculant agents and surging. What is the main purpose for developing monitoring wells? - โ โ To obtain representative water samples. What characteristic(s) may be observed to determine proper development of a ground water monitoring well? - โ โ 1. Turbidity.
- Temperature.
- pH A poorly developed monitoring well can lead to which of the following? - โ โ
- Low production rate.
- High turbidity.
- Non-representative ground water samples. The completion of a log is essential for... - โ โ 1. Compliance with regulatory entities.
In selecting a fluid for a well, the following consideration should be given. - โ โ Fluid should be selected on the basis of the circumstances of each individual well. When selecting a screen for a monitoring well, which of the following is not a consideration? - โ โ Type of well head seal. The purpose for making a sieve analysis of sand and gravel formations in monitoring well construction is... - โ โ ... to select the proper screen slot opening. When backfilling the annulus of a monitoring well after the filter pack and seal are in place, the best material to use is... - โ โ ... cement and/or bentonite grout materials. Which material is best for a typical 2-inch monitoring well filter pack? - โ โ Coarse clean silica sand. Without regard to sampling parameters, which of the four typical types of materials used for monitoring wells would deteriorate the quickest in a low pH environment? - โ โ Steel. A flush mount well cover should have... - โ โ ... concrete in the base.
