Treat the PG exam as a test of applied judgment organized by ASBOG's official task analysis, with the heaviest weight in Hydrogeology (22%), Engineering Geology (18%), and Mineral and Energy Resources (16%). The actionable advice: for every blueprint task statement, practice writing the professional deliverable it asks for, such as a well design, a hazard recommendation, or a reserve calculation, and allocate your study hours in proportion to each domain's blueprint percentage rather than to your comfort with the subject.
How the PG Blueprint Differs From the FG Exam You Already Passed
The PG blueprint shifts weight toward applied domains: Hydrogeology at 22%, Engineering Geology at 18%, and Mineral and Energy Resources at 16%, while Mineralogy, Petrology, and Geochemistry and Sedimentology, Stratigraphy, and Paleontology drop to 5% each.
Compare the two blueprints side by side. FG task statements ask you to identify minerals, describe fossils, and interpret landforms; PG statements ask you to plan investigations, design wells, provide recommendations for engineering design, and perform economic evaluation and reserve assessment. The verbs change from recognize to produce. When you study, rewrite each PG task statement as the end product a client or regulator would receive, then practice producing that product on paper.
The weighting has a direct consequence for scheduling. A candidate who rereads petrology notes is investing hours in a domain worth 5% while leaving 22% hydrogeology coverage thin. Build your calendar from Table 1 below: give hydrogeology roughly four times the attention you give mineralogy, and place engineering geology and resources sessions close behind. This is arithmetic from the published 2023 task analysis blueprint, not a prediction of which questions appear.
Table 1 shows the contrast at a glance.
| Domain | FG Weight | PG Weight | PG Study Emphasis |
|---|---|---|---|
| General geology and investigations | 17% | 17% | QA/QC, scope planning, maps, sections, logs |
| Mineralogy, petrology, geochemistry | 12% | 5% | Alteration effects and investigation planning only |
| Sedimentology, stratigraphy, paleontology | 11% | 5% | Depositional settings applied to site models |
| Geomorphology and surficial processes | 14% | 8% | Watershed processes, remote sensing interpretation |
| Structure, tectonics, seismology | 12% | 9% | Cross sections, paleoseismic evaluation |
| Hydrogeology | 13% | 22% | Aquifer properties, well design, fate and transport |
| Engineering geology | 12% | 18% | Index properties, hazards, design recommendations |
| Mineral and energy resources | 9% | 16% | Exploration, reserves, closure and reclamation |
Reading 'Plan and Conduct' Tasks as Deliverables, Not Topics
Most PG domains open with a task like plan and conduct investigations. Convert each one into a scope of work: objective, methods, data requirements, QA/QC steps, and reporting, framed around public health, safety, welfare, and applicable regulations.
Task 1 in the PG blueprint explicitly bundles public health, safety, and welfare, the environment, regulations, and Quality Assurance/Quality Control into investigation planning. That means a planning answer is incomplete if it names methods but omits calibration records, chain of custody, duplicate samples, or the reason a step protects the public. When you rehearse, force yourself to state the QA/QC control that matches each field or laboratory method you propose.
Run this drill weekly: choose five blueprint task statements at random and write a two-line scope of work for each, covering objective, primary method, and one QA/QC control. If you cannot fill the QA/QC line, you have found a gap worth a study session. For example, Task 3 (collect, describe, and record data) pairs naturally with borehole logging standards; Task 4 (positions, scales, elevations) pairs with map and GIS checks such as verifying datum and scale before measuring distances.
The drill takes fifteen minutes and exposes vocabulary gaps faster than rereading chapters.
Hydrogeology Scenarios: Wells, Aquifer Tests, and Contaminant Paths
At 22%, hydrogeology carries the single largest PG share. Expect tasks on hydraulic properties of saturated and vadose zones, well design, aquifer yield and sustainability, and chemical fate and transport in soil and water.
Worked scenario: a release of solvent has created a plume in an unconfined sandy aquifer underlain by a clay confining layer. You must design monitoring wells (Task 28). The plausible mistake is specifying one long screen spanning the whole saturated thickness at each location. That design vertically averages the water column and can dilute or entirely miss a dense contaminant layer resting on the clay. The better decision is a nested pair of short screens, one near the water table and one just above the clay, placed along transects perpendicular to the interpreted flow direction. It matters because well screen placement determines whether the dataset represents the contaminant distribution at all.
Worked scenario: a 72-hour pumping test in the same sand yields drawdown data you must interpret for aquifer yield (Tasks 27 and 29). The mistake is reporting a transmissivity value drawn from early-time data alone, which reflects the pumped well's near-field response and can overstate sustainable yield if a boundary, such as the clay pinch-out or a recharge stream, appears in late-time data. The better decision is to analyze late drawdown, check for boundary trends, and state yield as conditional on the observed flow system. Practice narrating both scenarios aloud until the reasoning, not just the definitions, is automatic.
Add vadose-zone concepts, such as tension and unsaturated flow, to the same scenarios.
Engineering Geology: Recommendations Must Follow From the Mechanism
At 18%, engineering geology asks for index and physical properties of earth materials, hazard mapping, and design recommendations for ground behavior, land use, and hazard mitigation. Tie every recommendation to a stated failure or deformation mechanism.
Worked scenario: a road cut is proposed in interbedded sandstone and clay shale dipping toward the excavation. You must provide recommendations for ground behavior (Task 37). The plausible mistake is basing the recommendation on intact rock compressive strength and specifying a rock bolt pattern. Strength of intact samples is not the governing variable when bedding-parallel discontinuities daylight in the cut face; the mechanism is planar sliding along a weak clay seam, controlled by orientation and pore pressure. The better decision is to recommend a discontinuity survey, piezometers to define groundwater levels in the bedding, and drainage plus geometry changes before any support design.
The reason this distinction matters: a support design sized against intact strength leaves the actual sliding plane untreated, which is a public safety problem, not just a scoring problem. Practice the same habit with expansive soils, liquefaction-prone loose sands, and karst: name the mechanism, identify the property that controls it, for example plasticity index, relative density, or soil-rock void geometry, then match the recommendation to that property. A recommendation without a mechanism is the pattern to eliminate from your answering before exam day.
Include remote sensing and GIS interpretation (Task 36) in the same drills.
Mineral and Energy Resources: Reserve Language and Closure Duties
At 16%, resources tasks span exploration planning, locating and distributing resources, economic evaluation and reserve assessment, quantity and quality calculations, and closure, waste management, and reclamation of extraction operations.
The conceptual hinge is the difference between a mineral resource and a mineral reserve. A resource is a concentration of material with reasonable prospects for economic extraction; a reserve is the portion demonstrated to be economically extractable after applying modifying factors such as mining method, processing recovery, permitting, and market conditions. In a quantity calculation scenario, the mistake is converting every estimated tonnage into a reserve statement as soon as drilling defines it. The better decision is to keep geological tonnage and reserve figures distinct and to state which modifying factors were applied to move material between categories.
Closure and reclamation tasks deserve their own rehearsal because they blend geology with obligations. Practice outlining what a closure study for a mine or energy operation must address: waste characterization, water management, and restoration of the site (Task 43). A useful self-check is to explain, in two sentences each, why reclamation planning begins during exploration rather than at the end of operations, and how water quality protection links the resources domain back to the hydrogeology tasks you studied for Section 3.
Sketch one grade-tonnage style calculation end to end as a practice exercise.
General Geology Domain: Maps, Sections, and Judged Investigation Design
General geology holds 17% on the PG, matching its FG weight, but the tasks change character: planning under QA/QC and regulatory framing, compiling existing information, recording new data, deriving positions and elevations, and interpreting logs, sections, and maps.
Build map skills as testable procedures rather than background knowledge. Practice three operations until they are mechanical: converting a scale statement into ground distance, tracing structure contours or section lines across a topographic base, and describing what a borehole log implies about the subsurface model between holes. Then practice the interpretive step the PG tasks demand: state what the graphic supports and what it does not, because a section drawn between sparse control points is an interpretation with stated uncertainty, not a measured fact.
Here is a practical exercise with a self-check rubric. Take any published geologic map and cross section. In twenty minutes, write: the map scale as a ratio and its ground meaning; the strike and dip symbols' meaning at two locations; one statement the section supports; one claim the section cannot support given the data density. Rubric: two points if the scale conversion is exact and explained; two points if your supported statement cites specific map evidence; two points if your unsupported claim identifies missing data such as subsurface control or age dates; two points if you note datum or elevation source; two points if you finish all four items in time. A score of eight or more suggests the graphic-interpretation tasks are in working order.
Repeat the exercise with a remotely sensed image for geomorphology tasks.
A Preparation Sequence and Concrete Readiness Checks
Sequence your preparation in three passes: a blueprint audit of every task statement, scenario practice in the three heaviest domains, and mixed-domain synthesis under time pressure. Finish with a checklist of deliverables you can produce from memory.
Pass one, spanning roughly the first third of your calendar: transcribe all PG blueprint task statements, mark each green, yellow, or red against your ability to write its deliverable, and schedule red items by domain weight, hydrogeology first, then engineering geology, then resources, then general geology, then the remainder. Pass two: work paper scenarios in the heaviest domains, including the well design, pumping test, slope, and reserve scenarios modeled above, always writing the mistake, the better decision, and the consequence. Pass three: mix domains in single sittings so you practice switching between a well screen question and a hazard question without losing the task framing.
Readiness checks, as learning milestones rather than pass predictions: you can state the PG weight of each domain from memory within a few points; you can sketch a monitoring well completion appropriate to two different aquifer-and-contaminant settings; you can name the mechanism, controlling property, and matched recommendation for three geologic hazards; you can distinguish resource from reserve and list two modifying factors; you can write a two-line scope of work with a QA/QC control for any blueprint task in under three minutes. If any check fails, return to the corresponding pass rather than rereading general texts.
For administrative details such as registration and scheduling, consult your state board and the ASBOG examinee materials directly, since eligibility and logistics are set at the state level.
The free practice page below is the place to run pass-three drills.
References and further reading
Use these references to explore the concepts and check the latest information from the relevant organizations.