CALIFORNIA RPF LATEST 2026 EXAM QUESTIONS AND
SOLUTIONS RATED A+
✔✔Which of the following species are susceptible to white pine blister rust? - ✔✔Five-
needle pines = sugar pine (pinus lambertiana), western white pine (pinus monticola)
✔✔According to §763 of the Professional Foresters Law, what is the minimum number
of individuals who are to be appointed by the board to serve on the Professional
Foresters' Examining Committee? - ✔✔7 total:
4 RPFs
1 certified specialist (certified rangelane mgmt)
2 public members, including 1 from the board of forestry
✔✔List 4 characteristics of fuels that affect the way fires burn and are important in
prescribed fire management. - ✔✔1. Size of fuel - particle size class
2. Fuel moisture
3. Distribution of fuel + loading
4. Type of fuel (composition)
✔✔How many TPA would you plant to achieve 16' spacing between trees? -
✔✔=43560/(16*16) = 170
Remember: an acre = 1 chain (66 feet) * 1 furlong (660 feet)
✔✔Why does the concept of MAI not apply well to uneven-aged stands? - ✔✔MAI
describes the average annual growth of trees, and trees grow at different rates during
their lives - therefore, for uneven-aged stands, the MAI is not effective at determining
the average growth rate
✔✔List 4 purposes a THP document serves during its life - ✔✔1. Guide for RPF
2. Information for regulatory agencies (CDF, CDFW, Water boards, CGS)
3. Guide for LTO
4. Enforceable document used by CDF
✔✔In logging terminology, define deadman. - ✔✔An anchoring device - where 1+ logs
are buried in the ground, then a guy or anchor line is attached
✔✔What is the common name of a California native fern that may indicate wet
conditions in a forest environment? - ✔✔Sword fern
✔✔A deduction from taxable income, allowed under specific conditions by US tax laws
to the owners of timber for reduction of an original growing stock through cutting. -
✔✔Depletion allowance (deduction for loss from fire, earthquake, ice, etc. = casualty
loss)
,✔✔What is the radius of a 1/5 acre inventory plot? - ✔✔Area = Πr^2
R = square root of Area/Π
43560/5 = 8712
√8712/3.14 = 53
✔✔Besides CO2, what are 3 naturally occurring greenhouse gases? - ✔✔Methane
(CH4), ozone (O3), water vapor (H2O)
✔✔Briefly define a "blind lead or area" in logging terminology. What are the obvious
negative environmental results of that situation. - ✔✔In a highlead system, when the
line of sight between the tailblock and the top of the tower is obscured by a slope; this
can lead to damage to residual trees and to increased erosion.
✔✔According to the CCR, an approach to harvesting based on the retention of
structural elements or biological legacies - ✔✔Variable retention
✔✔In a standard township, what is southwest of section 15? - ✔✔Answer = section 21
✔✔Define the term marginal cost - ✔✔This is the cost of producing one more unit, or
the increase in total cost by producing one more unit
✔✔Next to the regulatory programs, give the name of the CA state agency/department
that administers the program - ✔✔Streambed Alteration review = CDFW
Watershed Basin Plans = Regional Water Quality Control Boards
Off-Highway Motor Vehicle Registration = DMV
Forest slash burning = CDF
✔✔You are an RPF who prepared a THP, and operations have commenced. You have
a falling out with the plan submitter and you provide written notice to the LTO and plan
submitter of your plan to withdraw. What are the obligations of the LTO at this point? -
✔✔Cease operations (except for emergencies and operations necessary to protect
water quality) because there is not sufficient oversight; wait until a new RPF has signed
on as responsible
✔✔The Scribner Dec. C log rule differs from the International ¼" Rule in what basic
way? - ✔✔Scribner is a diagram rule, and the International is a mathematical formula
rule; International accounts for taper (meaning that Scriber underaccounts for logs)
✔✔On a cable logging system, describe the purpose of the haulback line. - ✔✔This
pulls the mainline cable and butt rigging from the landing to the logs and provides lift to
the mainline.
, ✔✔You want to thin a stand to 50' x 50' spacing - how many TPA would be left? -
✔✔=43560/(50*50) = 17 TPA
✔✔A plant that is more or less restricted to moist sites, but not considered an aquatic
plant is a _________. - ✔✔Hygrophyte (called a "hydrophyte" if it's actually in aquatic
areas). Examples would be equisetum and sedges, some ferns.
✔✔Dunning's Tree Classification is used to classify which species of conifers in the
FPRs? - ✔✔All commercial species - initially it was created to describe the vigor of pine,
its location within the stand structure, and its susceptibility to insects or disease, but it
has been applied to all commercial coniferous species
✔✔A geomorphic feature formed by coalescing scars originating from landsliding and
erosional processes caused by active stream erosion. The feature that is identified as
the area beginning immediately adjacent to the stream channel below the first break is
the _____. - ✔✔Inner gorge
✔✔As used in the FPRs, what is properly functioning salmonid habitat? - ✔✔The
beneficial functions of the riparian zone are suitable for all life-history stages of listed
anadromous salmonid species that would be expected to occur in specific geomorphic
conditions considering spatial and temporal variability.
✔✔To reduce current fuel hazard on timberlands, there are different permitting options
(aside from THPs); name 2 that require the QMD of the remaining stand to increase -
✔✔1. Forest Fire Prevention Exemption: Cutting trees to reduce vertical and horizontal
continuity §1038(i); in compliance with PRC §4584(k); this was increased to 24"
2. §1052.4 Emergency Notice: RPF prepares a Notice of Emergency Timber Operations
for immediate cutting for fuel hazard reduction
✔✔Using economics as the sole criteria to determine when a project or transaction is
economically feasible, name a condition that must be met? - ✔✔The NPV must be >0
✔✔List 3 life forms of herbaceous plants likely to be found in a forest type in temperate
North America - ✔✔Forbs, grasses, rushes, ferns
✔✔Silviculturally, what is meant by an intolerant species (and give an example)? -
✔✔Intolerant species do not survive well in shade (without adequate sunlight); an
example is Ponderosa pine
✔✔Regional WQB and state WRCB have the authority to require monitoring and
reporting as a condition of a waiver of WDR on THPs: what is the legislative basis? -
✔✔Porter-Cologne Act?? - Yes
SOLUTIONS RATED A+
✔✔Which of the following species are susceptible to white pine blister rust? - ✔✔Five-
needle pines = sugar pine (pinus lambertiana), western white pine (pinus monticola)
✔✔According to §763 of the Professional Foresters Law, what is the minimum number
of individuals who are to be appointed by the board to serve on the Professional
Foresters' Examining Committee? - ✔✔7 total:
4 RPFs
1 certified specialist (certified rangelane mgmt)
2 public members, including 1 from the board of forestry
✔✔List 4 characteristics of fuels that affect the way fires burn and are important in
prescribed fire management. - ✔✔1. Size of fuel - particle size class
2. Fuel moisture
3. Distribution of fuel + loading
4. Type of fuel (composition)
✔✔How many TPA would you plant to achieve 16' spacing between trees? -
✔✔=43560/(16*16) = 170
Remember: an acre = 1 chain (66 feet) * 1 furlong (660 feet)
✔✔Why does the concept of MAI not apply well to uneven-aged stands? - ✔✔MAI
describes the average annual growth of trees, and trees grow at different rates during
their lives - therefore, for uneven-aged stands, the MAI is not effective at determining
the average growth rate
✔✔List 4 purposes a THP document serves during its life - ✔✔1. Guide for RPF
2. Information for regulatory agencies (CDF, CDFW, Water boards, CGS)
3. Guide for LTO
4. Enforceable document used by CDF
✔✔In logging terminology, define deadman. - ✔✔An anchoring device - where 1+ logs
are buried in the ground, then a guy or anchor line is attached
✔✔What is the common name of a California native fern that may indicate wet
conditions in a forest environment? - ✔✔Sword fern
✔✔A deduction from taxable income, allowed under specific conditions by US tax laws
to the owners of timber for reduction of an original growing stock through cutting. -
✔✔Depletion allowance (deduction for loss from fire, earthquake, ice, etc. = casualty
loss)
,✔✔What is the radius of a 1/5 acre inventory plot? - ✔✔Area = Πr^2
R = square root of Area/Π
43560/5 = 8712
√8712/3.14 = 53
✔✔Besides CO2, what are 3 naturally occurring greenhouse gases? - ✔✔Methane
(CH4), ozone (O3), water vapor (H2O)
✔✔Briefly define a "blind lead or area" in logging terminology. What are the obvious
negative environmental results of that situation. - ✔✔In a highlead system, when the
line of sight between the tailblock and the top of the tower is obscured by a slope; this
can lead to damage to residual trees and to increased erosion.
✔✔According to the CCR, an approach to harvesting based on the retention of
structural elements or biological legacies - ✔✔Variable retention
✔✔In a standard township, what is southwest of section 15? - ✔✔Answer = section 21
✔✔Define the term marginal cost - ✔✔This is the cost of producing one more unit, or
the increase in total cost by producing one more unit
✔✔Next to the regulatory programs, give the name of the CA state agency/department
that administers the program - ✔✔Streambed Alteration review = CDFW
Watershed Basin Plans = Regional Water Quality Control Boards
Off-Highway Motor Vehicle Registration = DMV
Forest slash burning = CDF
✔✔You are an RPF who prepared a THP, and operations have commenced. You have
a falling out with the plan submitter and you provide written notice to the LTO and plan
submitter of your plan to withdraw. What are the obligations of the LTO at this point? -
✔✔Cease operations (except for emergencies and operations necessary to protect
water quality) because there is not sufficient oversight; wait until a new RPF has signed
on as responsible
✔✔The Scribner Dec. C log rule differs from the International ¼" Rule in what basic
way? - ✔✔Scribner is a diagram rule, and the International is a mathematical formula
rule; International accounts for taper (meaning that Scriber underaccounts for logs)
✔✔On a cable logging system, describe the purpose of the haulback line. - ✔✔This
pulls the mainline cable and butt rigging from the landing to the logs and provides lift to
the mainline.
, ✔✔You want to thin a stand to 50' x 50' spacing - how many TPA would be left? -
✔✔=43560/(50*50) = 17 TPA
✔✔A plant that is more or less restricted to moist sites, but not considered an aquatic
plant is a _________. - ✔✔Hygrophyte (called a "hydrophyte" if it's actually in aquatic
areas). Examples would be equisetum and sedges, some ferns.
✔✔Dunning's Tree Classification is used to classify which species of conifers in the
FPRs? - ✔✔All commercial species - initially it was created to describe the vigor of pine,
its location within the stand structure, and its susceptibility to insects or disease, but it
has been applied to all commercial coniferous species
✔✔A geomorphic feature formed by coalescing scars originating from landsliding and
erosional processes caused by active stream erosion. The feature that is identified as
the area beginning immediately adjacent to the stream channel below the first break is
the _____. - ✔✔Inner gorge
✔✔As used in the FPRs, what is properly functioning salmonid habitat? - ✔✔The
beneficial functions of the riparian zone are suitable for all life-history stages of listed
anadromous salmonid species that would be expected to occur in specific geomorphic
conditions considering spatial and temporal variability.
✔✔To reduce current fuel hazard on timberlands, there are different permitting options
(aside from THPs); name 2 that require the QMD of the remaining stand to increase -
✔✔1. Forest Fire Prevention Exemption: Cutting trees to reduce vertical and horizontal
continuity §1038(i); in compliance with PRC §4584(k); this was increased to 24"
2. §1052.4 Emergency Notice: RPF prepares a Notice of Emergency Timber Operations
for immediate cutting for fuel hazard reduction
✔✔Using economics as the sole criteria to determine when a project or transaction is
economically feasible, name a condition that must be met? - ✔✔The NPV must be >0
✔✔List 3 life forms of herbaceous plants likely to be found in a forest type in temperate
North America - ✔✔Forbs, grasses, rushes, ferns
✔✔Silviculturally, what is meant by an intolerant species (and give an example)? -
✔✔Intolerant species do not survive well in shade (without adequate sunlight); an
example is Ponderosa pine
✔✔Regional WQB and state WRCB have the authority to require monitoring and
reporting as a condition of a waiver of WDR on THPs: what is the legislative basis? -
✔✔Porter-Cologne Act?? - Yes
