CPG Study Guide 2026
Everything you need to pass the CPG exam in one place: the exam format, every topic to study, real practice questions with explanations, flashcards, and full-length practice tests. Free, no sign-up needed.
📋 CPG Exam Format at a Glance
📚 CPG Topics to Study (28)
✍️ Sample CPG Questions & Answers
1. What factor MOST affects the validity of environmental monitoring & assessment outcomes in Certified Professional Geologist?
Validity depends primarily on using consistent, appropriate methods that actually measure what they are intended to measure.
2. What is a retaining wall used for in geotechnical engineering?
A retaining wall is a structure used in geotechnical engineering to hold back soil or rock from a slope that would otherwise collapse or erode. Its primary purpose is to stabilize slopes, prevent soil erosion, and create usable land on uneven terrain. By counteracting lateral earth pressure, retaining walls ensure the stability of elevated ground surfaces for construction or landscaping.
3. Under current EPA ProUCL guidance, which method is preferred for handling nondetects when computing summary statistics?
ProUCL recommends Kaplan-Meier or similar methods over arbitrary substitution, which can bias the mean and variance.
4. Which practice best prevents cross-contamination when sampling multiple monitoring wells with one non-dedicated pump?
Going from clean to dirty wells and fully decontaminating between them lowers the risk of carrying contamination over.
5. The CPG (Certified Professional Geologist) credential is issued by which organization?
AIPG administers the CPG certification program, which has been the national standard for professional geologist certification since 1963.
6. Why are field SPT blow counts commonly corrected to N60?
Hammer systems deliver different energy ratios, so N is normalized to a 60% energy efficiency standard.
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How this page was made: written with AI tools and published by Nathan Beja, founder of Practice Test Geeks, who is responsible for its content. Exam facts are checked against the official sources listed below. Not reviewed by a subject-matter expert. Editorial policy
Sources & references
Exam facts on this page (fees, format, dates, passing scores) are checked against these official sources; the date is our last check. Editorial policy
- aipg.org — Score release, eligibility, fees, renewal, test delivery · verified Oct 2026