GA Well Driller common mistakes
GA Well Driller · Understand the traps and how to avoid them.
Treating the Georgia well-construction rule numbers (setback distances, casing depth, grout requirements) as general knowledge and recalling them approximately instead of as exact figures tied to the specific rule provision.
Georgia's Water Well Standards impose specific numeric requirements that differ from neighboring states and from generic industry practice; candidates who learned drilling on the job often rely on habit or another state's numbers, and the exam tests the Georgia-specific value.
What to do instead
Build a one-page reference sheet of every numeric requirement in the Georgia rules (minimum casing length and depth, annular seal depth, minimum setbacks from sources of contamination, grout types and placement methods) and drill yourself on recalling each number together with the rule section it comes from, until the value and its context are linked.
Selecting a well site by convenience of access for the rig rather than by evaluating topography, drainage, nearby contamination sources, and setback compliance before mobilization.
Field pressure to start drilling and site-access constraints push crews to pick the easiest pad; candidates who have not done siting reviews underestimate how many exam items hinge on drainage direction, floodplain position, and distance to septic systems or fuel storage.
What to do instead
Practice a fixed siting checklist for every scenario: uphill and upslope of contamination, outside floodplain, compliant setbacks, adequate drainage away from the wellhead, and room for the rig and grout equipment. Work through hypothetical parcels and justify each accept/reject decision in writing.
Confusing the purpose and required depth of the annular seal with the purpose of the casing, and specifying a seal that stops short of the first competent confining layer.
Casing and grout are often discussed together in the field, so candidates blur the functions: casing holds the borehole open and excludes shallow water, while the annular seal prevents vertical migration along the outside of the casing. Items that ask where the seal must terminate expose this blur.
What to do instead
State the two functions separately and memorize the rule that the annular seal must extend from the surface (or specified minimum) down to a competent confining unit or the required depth. For each practice scenario, identify the confining layer first, then set the seal depth from it.
Specifying a grout mix or placement method without matching it to the annular space width, hole conditions, and the rule's approved methods (for example, using a method that cannot fill a large washed-out annulus or a dry hole).
Candidates memorize grout names but not the placement constraints; the exam tests whether the chosen method can actually displace drilling fluid and fill the annulus without bridging or voids, which depends on annulus geometry and hole stability.
What to do instead
Learn each approved placement method with its applicability limits: neat cement versus bentonite-sand mixes, tremie placement from the bottom up, positive displacement, and when a larger annulus requires a specific approach. Practice matching method to annulus diameter, hole condition, and depth, and explain why alternatives fail.
Choosing a drilling method (mud rotary, air rotary, cable tool, auger, reverse circulation) by default habit rather than by formation type, depth, water quality concerns, and the risk of cross-contamination.
Most drillers specialize in one method and answer from that experience; exam items deliberately present formations or contamination sensitivities where the familiar method is wrong, such as air rotary in a setting where it could spread contamination or augers in unstable caving ground.
What to do instead
Make a comparison matrix of drilling methods against formation, depth, hole stability, sample quality, and contamination risk, and practice selecting a method for unfamiliar scenarios with a written justification. Pay special attention to methods that introduce air or fluid that could migrate contaminants.
Treating well development as a fixed step performed the same way on every well, rather than selecting a development method and duration based on the drilling method used, the formation, and the completion design.
Development is often done by routine on familiar jobs; candidates miss that mud rotary wells need different development than cable-tool or air-drilled wells, and that over-development or under-development both cause problems the exam tests.
What to do instead
Study each development technique (surging, bailing, jetting, air lifting, overpumping) with the drilling methods and formations it suits, and the indicators that development is complete (turbidity, sand content, specific capacity stabilization). Practice choosing a method and a stopping criterion for varied scenarios.
Confusing disinfection contact time, concentration, and post-disinfection testing requirements, and reporting a well as ready for use without verifying chlorine residual and bacteriological clearance.
Disinfection is frequently done from memory with approximate concentrations and no documented contact time; exam items test the specific concentration, contact period, and the requirement to verify residual and, where required, sample results before the well is placed in service.
What to do instead
Memorize the required chlorine concentration, minimum contact time, and the sequence of flushing, residual verification, and sampling. Practice writing a complete disinfection and clearance procedure in order, including what must happen if residual or sample results fail.
Sizing a pump and pressure system by matching the existing installation or the pump curve alone, without reconciling well yield, drawdown, total dynamic head, and pressure tank sizing.
Candidates often size from a pump catalog or a familiar horsepower; exam items require combining well yield and safe drawdown with system demand, friction loss, and tank drawdown volume, and answers that ignore one of these inputs are the distractors.
What to do instead
Work numerical problems end to end: compute total dynamic head from static water level, drawdown, lift, and friction; check the selected pump's operating point against well yield; then size the pressure tank from pump output, cut-in/cut-out pressures, and acceptable cycle frequency. Do enough repetitions that the sequence is automatic.
Describing abandonment as pulling the pump and filling the hole, omitting the required sequence of removing or perforating obstructions, sealing intervals, and verifying seal placement and materials.
Abandonment is low-frequency work for many drillers, so the detailed procedure is unfamiliar; the exam tests that sealing must isolate aquifers and prevent inter-aquifer migration, which requires proper materials and placement rather than a bulk fill.
What to do instead
Learn the abandonment sequence as an ordered procedure: remove or perforate casing and liners as required, clean the borehole, place approved sealing material by an approved method from the bottom up, verify the top of the seal and record volumes. Practice describing the procedure for cased, uncased, and gravel-packed wells separately.
Answering safety and site-management items from general common sense rather than from specific required practices for confined spaces, electrical protection, rigging, and drilling-fluid and cuttings containment.
Experienced candidates rely on informal habits and skip the regulatory specifics, while the exam tests concrete requirements such as lockout, grounding, pit and containment design, and housekeeping that prevent the common site incidents.
What to do instead
Build a safety checklist by task (rig setup, confined-space entry, electrical, chemical handling, spoil and fluid containment, site restoration) and study the specific requirement behind each item. Practice identifying the single most serious hazard and the required control in short scenario items.