OH Well Driller flashcards
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- Licensed water well driller
- An individual or contractor holding Ohio Division of Water Resources authorization to construct, deepen, or abandon wells for others; unlicensed drilling is subject to enforcement action.
- Drilling contractor license
- A license issued to a business entity rather than a person; it is not transferable and requires notice to the Division when ownership or business name changes.
- Continuing education requirement
- Hours of approved training a licensed driller must complete each renewal cycle to keep the license active; a lapsed license may need reinstatement instead.
- Licensing examination
- Test covering Ohio well construction rules, grouting and sealing, disinfection, abandonment, and reporting that an applicant must pass before being licensed.
- Cable tool drilling
- A percussion method that lifts and drops a heavy bit to break rock, with cuttings removed by bailing; effective in unconsolidated material and fractured bedrock.
- Mud rotary drilling
- A method circulating bentonite or polymer slurry that cools the bit, carries cuttings to the surface, and deposits a filter cake that stabilizes the borehole wall.
- Rotary air drilling
- A method using compressed air to remove cuttings, common in hard bedrock; foam or water may be added to control dust and improve hole stability.
- Well siting setbacks
- Required minimum distances between a well and contamination sources such as septic systems, animal enclosures, and fuel tanks, set by rule to protect water quality.
- Annular space
- The gap between the borehole wall and the casing that must be filled with grout; borehole diameter is chosen to provide the required clearance.
- Sanitary well seal
- A watertight cap at the top of the casing that excludes surface water, insects, and debris while allowing access for measurement and service.
- Tremie grouting
- Placing grout from the bottom of the annular space upward with a pump or pipe so the seal is continuous and free of voids and bridging.
- Pitless adapter
- A fitting that carries the discharge pipe through the casing below the frost line and seals watertight, avoiding the need for a well pit.
- Casing minimum height
- The required distance the casing must extend above finished grade or floor, paired with a sloped concrete pad that directs surface water away from the well.
- Grout materials
- Approved sealing materials such as neat cement, sand-cement, or bentonite; used or damaged casing and unsuitable fill may not be used in a sealed well.
- Well development
- Removal of drilling mud, cuttings, and fines from the formation and filter pack by surging, bailing, jetting, or air-lifting until discharge runs clear.
- Drawdown
- The difference between the static water level measured before pumping and the pumping water level measured during the yield test, expressed in feet.
- Specific capacity
- Pumping rate divided by drawdown, reported in gallons per minute per foot; a measure of well efficiency used to compare performance over time.
- Well disinfection
- Treatment with a chlorine solution that contacts casing, screen, and pump for a required holding period, followed by pumping to waste until residual is gone.
- Bacteriological sample
- A water sample collected in a sterile container after disinfection and flushing, submitted to a certified laboratory to confirm the well is free of contamination.
- Safe yield test
- A controlled pumping or bailing test that establishes the sustainable production rate and drawdown; rate and duration are recorded on the well log.
- Well abandonment
- Permanent sealing of a well no longer in use or unable to produce potable water; leaving a well open or unsealed is a violation of Ohio rules.
- Bottom-up sealing
- Filling the borehole from the bottom upward with approved grout or bentonite using a tremie or pump so no voids or gaps remain in the seal.
- Obstruction removal
- Clearing or perforating casing, pumps, and other downhole equipment before abandonment so sealant can be placed through the full length of the borehole.
- Abandonment report
- A filing with the Division of Water Resources describing the sealing method, materials used, and quantities, plus the recorded location of the sealed well.
- Artesian well plugging
- Special sealing of a flowing well that controls discharge before and during plugging so the seal sets properly and water is not lost between aquifers.
- Well log filing
- Submission of a record for each completed well showing location, depth, formations, casing, grout, screen, yield, and static water level within the required time.
- Owner copy of log
- A copy of the completed well log and any water quality information given to the well owner at completion, separate from the copy filed with the state.
- High-capacity withdrawal
- A large-volume water withdrawal that may trigger permitting and reporting obligations under Ohio water resources law beyond ordinary well log filing.
- Division inspection authority
- The state's power to inspect wells and order correction of casing, grout, or sealing defects; uncorrected defects can lead to license action.
- Local health district rules
- Additional siting and permitting requirements imposed by county or local health authorities that apply in addition to statewide well construction rules.
- Record retention
- The obligation to keep drilling records and make them available to the Division on request, and to report changes of address or business status.
- Static water level
- The undisturbed water level in a well measured before pumping begins; it is the baseline from which drawdown during a yield test is calculated.