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1. Impacts to watershed resources within the Watershed Assessment Area (WWA) shall be evaluated based on significant on-site and off-site cumulative effects on beneficial uses of water, as defined and listed in applicable Water Quality Control Plans.
2. Watershed effects produced by timber harvest and other activities may include one or more of the following:
Sediment.
Water temperature.
Organic debris.
Chemical contamination.
Peak flow.
The following general guidelines shall be used when evaluating watershed impacts. The factors described are general and may not be appropriate for all situations. Actual measurements may be required if needed to evaluate significant environmental effects. The plan must comply with the quantitative or narrative water-quality objectives set forth in an applicable Water Quality Control Plan.
a. Sediment Effects
Sediment-induced CWEs occur when earth materials transported by surface or mass wasting erosion enter a stream or stream system at separate locations and are then combined at a downstream location to produce a change in water quality or channel condition. The eroded materials can originate from the same or different projects. Potentially adverse changes are most likely to occur in the following locations and situations:
- Downstream areas of reduced stream gradient where sediment from a new source may be deposited in addition to sediment derived from existing or other new sources.
- Immediately downstream from where sediment from a new source is combined with sediment from other new or existing sources and the combined amount of sediment exceeds the transport capacity of the stream.
- Any location where sediment from new sources in combination with suspended sediment from existing or other new sources significantly reduces the survival of fish or other aquatic organisms or reduces the quality of waters used for domestic, agricultural, or other beneficial uses.
- Channels with relatively steep gradients which contain accumulated sediment and debris that can be mobilized by sudden new sediment inputs, such as debris flows, resulting in debris torrents and severe channel scouring.
Potentially significant adverse impacts of cumulative sediment inputs may include:
- Increased treatment needs or reduced suitability for domestic, municipal, industrial, or agricultural water use.
- Direct mortality of fish and other aquatic species.
- Reduced viability of aquatic organisms or disruption of aquatic habitats and loss of stream productivity caused by filling of pools and plugging or burying streambed gravel.
- Accelerated channel filling (aggradation) resulting in loss of streamside vegetation and stream migration that can cause accelerated bank erosion.
- Accelerated filling of downstream reservoirs, navigable channels, water diversion and transport facilities, estuaries, and harbors.
- Channel scouring by debris flows and torrents.
- Nuisance to or reduction in water related recreational activities.
Situations where sediment production potential is greatest include:
- Sites with high or extreme erosion hazard ratings.
- Sites which are tractor logged on steep slopes.
- Unstable areas.
b. Water Temperature Effects
Water temperature related CWEs are changes in water chemistry or biological properties caused by the combination of solar warmed water from two or more locations (in contrast to an individual effect that results from impacts along a single stream segment) where natural cover has been removed. Cumulative changes in water temperature are most likely to occur in the following situations:
- Where stream bottom materials are dark in color.
- Where water is shallow and has little underflow.
- Where removal of streamside canopy results in substantial, additional solar exposure or increased contact with warm air at two or more locations along a stream.
- Where removal of streamside canopy results in substantial, additional solar exposure or increased contact with warm air at two or more streams that are tributary to a larger stream.
- Where water temperature is near a biological threshold for specific species.
Significant adverse impacts of cumulative temperature increases include:
- Increases in the metabolic rate of aquatic species.
- Direct increases in metabolic rate and/or reduction of dissolved oxygen levels, either of which can cause reduced vigor and death of sensitive fish and other sensitive aquatic organisms.
- Increased growth rates of microorganisms that deplete dissolved oxygen levels or increased disease potential for organisms.
- Stream biology shifts toward warmer water ecosystems.
c. Organic Debris Effects
CWEs produced by organic debris can occur when logs, limbs, and other organic material are introduced into a stream or lake at two or more locations. Decomposition of this debris, particularly the smaller sized and less woody material, removes dissolved oxygen from the water and can cause impacts similar to those resulting from increased water temperatures. Introduction of excessive small organic debris can also increase water acidity.
Large organic debris is an important stabilizing agent that should be maintained in small to medium size, steep gradient channels, but the sudden introduction of large, unstable volumes of bigger debris (such as logs, chunks, and larger limbs produced during a logging operation) can obstruct and divert streamflow against erodible banks, block fish migration, and may cause debris torrents during periods of high flow.
Removing streamside vegetation can reduce the natural, annual inputs of litter to the stream (after decomposition of logging- related litter.) This can cause both a drop in food supply, and resultant productivity, and a change in types of food available for organisms that normally dominate the lower food chain of streams with an overhanging or adjacent forest canopy.
d. Chemical Contamination Effects
Potential sources of chemical CWEs include run-off from roads treated with oil or other dust-retarding materials, direct application or run-off from pesticide treatments, contamination by equipment fuels and oils, and the introduction of nutrients released during slash burning or wildfire from two or more locations.
e. Peak Flow Effects
CWEs caused by management induced peak flow increases in streams during storm events are difficult to anticipate. Peak flow increases may result from management activities that reduce vegetative water use or produce openings where snow can accumulate (such as clear-cutting and site preparation) or that change the timing of flows by producing more efficient runoff routing (such as insloped roads.) These increases, however, are likely to be small relative to natural peak flows from medium and large storms. Research to date on the effects of management activities on channel conditions indicates that channel changes during storm events are primarily the result of large sediment inputs.
3. Watercourse Condition
The watershed impacts of past upstream and on-site projects are often reflected in the condition of stream channels on the project area. Following is a list of channel characteristics and factors that may be used to describe current watershed conditions and to assist in the evaluation of potential project impacts:
Gravel Embedded - Spaces between stream gravel filled with sand or finer sediments. Gravel are often in a tightly packed arrangement.
Pools Filled - Former pools or apparent pool areas filled with sediments leaving few areas of deep or "quiet" water relative to stream flow or size.
Aggrading - Stream channels filled or filling with sediment that raises the channel bottom elevation. Pools will be absent or greatly diminished and gravel may be embedded or covered by finer sediments. Streamside vegetation may be partially or completely buried, and the stream may be meandering or cutting into its banks above the level of the former streambed. Depositional areas in aggrading channels are often increasing in size and number.
Bank Cutting - Can either be minor or severe and is indicated by areas of fresh, unvegetated soil or alluvium exposed along the stream banks, usually above the low-flow channel and often with a vertical or undercut face. Severe bank cutting is often associated with channels that are downcutting, which can lead to over-steepened banks, or aggrading, which can cause the channel to migrate against slopes that were previously above the high flow level of the stream.
Bank Mass Wasting - Channels with landslides directly entering the stream system. Slide movement may be infrequent (single events) or frequent (continuing creep or periodic events).
Downcutting - Incised stream channels with relatively clean, uncluttered beds cut below the level of former streamside vegetation and with eroded, often undercut or vertical, banks.
Scoured - Stream channels that have been stripped of gravel and finer bed materials by large flow events or debris torrents. Streamside vegetation has often been swept away, and the channel has a raw, eroded appearance.
Organic Debris - Debris in the watercourse can have either a positive or negative impact depending on the amount and stability of the material. Some stable organic debris present in the watercourse helps to form pools and retard sediment transport and downcutting in small to medium sized streams with relatively steep gradients. Large accumulations of organic debris can block fish passage, block or divert streamflow, or could be released as a debris flow.
Stream-Side Vegetation - Stream-side vegetation and near-stream vegetation provide shade or cover to the stream, which may have an impact on water temperature, and provides root systems that stabilize streambanks and floodplains and filter sediment from flood flows.
Recent Floods - A recent high flow event that would be considered unusual in the project area may have an impact on the current watercourse condition.
B. Soil Productivity
Cumulative soil productivity impacts occur when the effects of two or more activities, from the same or different projects, combine to produce a significant decrease in soil biomass production potential. These impacts most often occur on-site within the project boundary, and the relative severity of productivity losses for a given level of impact generally increases as site quality declines.
The primary factors influencing soil productivity that can be affected by timber operations include:
Organic matter loss.
Surface soil loss.
Soil compaction.
Growing space loss.
The following general guidelines may be used when evaluating soil productivity impacts.
1. Organic Matter Loss
Displacement or loss of organic matter can result in a long term loss of soil productivity. Soil surface litter and downed woody debris are the store-house of long term soil fertility, provide for soil moisture conservation, and support soil microorganisms that are critical in the nutrient cycling and uptake process. Much of the chemical and microbial activity of the forest nutrient cycle is concentrated in the narrow zone at the soil and litter interface.
Displacement of surface organic matter occurs as a result of skidding, mechanical site preparation, and other land disturbing timber operations. Actual loss of organic matter occurs as a result of burning or erosion. The effects of organic matter loss on soil productivity may be expressed in terms of the percentage displacement or loss as a result of all project activities.
2. Surface Soil Loss
The soil is the storehouse of current and future site fertility, and the majority of nutrients are held in the upper few inches of the soil profile. Topsoil displacement or loss can have an immediate effect on site productivity, although effects may not be obvious because of reduced brush competition and lack of side-by-side comparisons or until the new stand begins to fully occupy the available growing space.
Surface soil is primarily lost by erosion or by displacement into windrows, piles, or fills. Mass wasting is a special case of erosion with obvious extreme effects on site productivity. The impacts of surface soil loss may be evaluated by estimating the proportion of the project area affected and the depth of loss or displacement.
3. Soil Compaction
Compaction affects site productivity through loss of large soil pores that transmit air and water in the soil and by restricting root penetration. The risk of compaction is associated with:
- Depth of surface litter.
- Soil organic matter content.
- Soil texture.
- Soil structure.
- Presence and amount of coarse fragments in the soil.
- Soil moisture status.
Compaction effects may be evaluated by considering the soil conditions, as listed above, at the time of harvesting activities and the proportion of the project area subjected to compacting forces.
4. Growing Space Loss
Forest growing space is lost to roads, landings, permanent skid trails, and other permanent or non-restored areas subjected to severe disturbance and compaction.
The effects of growing space loss may be evaluated by considering the overall pattern of roads, etc., relative to feasible silvicultural systems and yarding methods.
C. Biological Resources
Biological assessment areas will vary with the species being evaluated and its habitat. Factors to consider in the evaluation of cumulative biological impacts include:
1. Any known rare, threatened, or endangered species or sensitive species (as described in the Forest Practice Rules) that may be directly or indirectly affected by project activities.
Significant cumulative effects on listed species may be expected from the results of activities over time which combine to have a substantial effect on the species or on the habitat of the species.
2. Any significant, known wildlife or fisheries resource concerns within the immediate project area and the biological assessment area (e.g. loss of oaks creating forage problems for a local deer herd, species requiring special elements, sensitive species, and significant natural areas).
Significant cumulative effects may be expected where there is a substantial reduction in required habitat or the project will result in substantial interference with the movement of resident or migratory species.
The significance of cumulative impacts on non-listed species viability should be determined relative to the benefits to other non-listed species. For example, the manipulation of habitat results in conditions which discourage the presence of some species while encouraging the presence of others.
3. The aquatic and near-water habitat conditions on the THP and immediate surrounding area. Habitat conditions of major concern are:
Pools and riffles.
Large woody material in the stream.
Near-water vegetation.
Much of the information needed to evaluate these factors is described in the preceding Watershed Resources section. A general discussion of their importance is given below:
a. Pools and Riffles
Pools and riffles affect overall habitat quality and fish community structure. Streams with little structural complexity offer poor habitat for fish communities as a whole, even though the channel may be stable. Structural complexity is often lower in streams with low gradients, and filling of pools can reduce stream productivity.
b. Large Woody Material
Large woody debris in the stream plays an important role in creating and maintaining habitat through the formation of pools. These pools comprise important feeding locations that provide maximum exposure to drifting food organisms in relatively quiet water. Removal of woody debris can reduce frequency and quality of pools.
c. Near-Water Vegetation
Near-water vegetation provides many habitat benefits, including: shade, nutrients, vertical diversity, migration corridors, nesting, roosting, and escape. Recruitment of large woody material is also an important element in maintaining habitat quality.
4. The biological habitat condition of the THP and immediate surrounding area. Significant factors to consider are:
Snags/den trees
Downed, large woody debris
Multistory canopy
Road density
Hardwood cover
Late seral (mature) forest characteristics
Late seral habitat continuity
The following general guidelines may be used when evaluating biological habitat. The factors described are general and may not be appropriate for all situations. The THP preparer must also be alert to the need to consider factors which are not listed below. Each set of ground conditions are unique and the analysis conducted must reflect those conditions.
a. Snags/Den/Nest Trees: Snags, den trees, nest trees and their recruitment are required elements in the overall habitat needs of more than 160 wildlife species. Many of these species play a vital role in maintaining the overall health of timberlands. Snags of greatest value are > 16" DBH and 20 feet in height. The degree of snag recruitment over time should be considered. Den trees are partially live trees with elements of decay which provide wildlife habitat. Nest trees have importance to birds classified as a sensitive species.
b. Downed large, woody debris: Large downed logs (particularly conifers) in the upland and near-water environment in all stages of decomposition provide an important habitat for many wildlife species. Large woody debris of greatest value consists of downed logs > 16" diameter at the large end and > 20 feet in length.
c. Multistory canopy: Upland multistoried canopies have a marked influence on the diversity and density of wildlife species utilizing the area. More productive timberland is generally of greater value and timber site capability should be considered as a factor in an assessment. The amount of upland multistoried canopy may be evaluated by estimating the percent of the stand composed of two or more tree layers on an average per acre basis.
Near-water multistoried canopies in riparian zones that include conifer and hardwood tree species provide an important element of structural diversity to the habitat requirements of wildlife. Near-water multistoried canopy may be evaluated by estimating the percentage of ground covered by one or more vegetative canopy strata, with more emphasis placed on shrub species along Class III and IV streams (14 CCR 916.5, 936.5, or 956.5).
d. Road Density: Frequently traveled permanent and secondary roads have a significant influence on wildlife use of otherwise suitable habitat. Large declines in deer and bear use of areas adjacent to open roads are frequently noted. Road density influence on large mammal habitat may be evaluated by estimating the miles of open permanent and temporary roads, on a per-section basis, that receive some level of maintenance and are open to the public. This assessment should also account for the effects of vegetation screening and the relative importance of an area to wildlife on a seasonal basis (e.g. winter range).
e. Hardwood Cover: Hardwoods provide an important element of habitat diversity in the coniferous forest and are utilized as a source of food and/or cover by a large proportion of the state's bird and mammal species. Productivity of deer and other species has been directly related to mast crops. Hardwood cover can be estimated using the basal area per acre provided by hardwoods of all species.
Post-harvest deciduous oak retention for the maintenance of habitats for mule deer and other hardwood-associated wildlife shall be guided by the Joint Policy on Hardwoods between the California Board of Forestry and California Fish and Game Commission (5/9/94). To sustain wildlife, a diversity of stand structural and seral conditions, and tree size and age classes of deciduous oaks should be retained in proportions that are ecologically sustainable. Regeneration and recruitment of young deciduous oaks should be sufficient over time to replace mortality of older trees. Deciduous oaks should be present in sufficient quality and quantity, and in appropriate locations to provide functional habitat elements for hardwood-associated wildlife.
f. Late Seral (Mature) Forest Characteristics: Determination of the presence or absence of mature and over- mature forest stands and their structural characteristics provides a basis from which to begin an assessment of the influence of management on associated wildlife. These characteristics include large trees as part of a multilayered canopy and the presence of large numbers of snags and downed logs that contribute to an increased level of stand decadence. Late seral stage forest amount may be evaluated by estimating the percentage of the land base within the project and the biological assessment area occupied by areas conforming to the following definitions:
Forests not previously harvested should be at least 80 acres in size to maintain the effects of edge. This acreage is variable based on the degree of similarity in surrounding areas. The area should include a multi-layered canopy, two or more tree species with several large coniferous trees per acre (smaller subdominant trees may be either conifers or hardwoods), large conifer snags, and an abundance of large woody debris.
Previously harvested forests are in many possible stages of succession and may include remnant patches of late seral stage forest which generally conform to the definition of unharvested forests but do not meet the acreage criteria.
g. Late Seral Habitat Continuity: Projects containing areas meeting the definitions for late seral stage characteristics must be evaluated for late seral habitat continuity. The fragmentation and resultant isolation of late seral habitat types is one of the most significant factors influencing the sustainability of wildlife populations not adapted to edge environments.
This fragmentation may be evaluated by estimating the amount of the on-site project and the biological assessment area occupied by late seral stands greater than 80 acres in size (considering the mitigating influence of adjacent and similar habitat, if applicable) and less than one mile apart or connected by a corridor of similar habitat.
h. Special Habitat Elements: The loss of a key habitat element may have a profound effect on a species even though the habitat is otherwise suitable. Each species may have several key limiting factors to consider. For example, a special need for some large raptors is large decadent trees/snags with broken tops or other features. Deer may have habitat with adequate food and cover to support a healthy population size and composition but dependent on a few critical meadows suitable for fawning success. These and other key elements may need special protection.
D. Recreational Resources: The recreational assessment area is generally the area that includes the logging area plus 300 feet.
To assess recreational cumulative impacts:
1. Identify the recreational activities involving significant numbers of people in and within 300 feet of logging area (e.g., fishing, hunting, hiking, picnicking, camping).
2. Identify any recreational Special Treatment Areas described in the Board of Forestry rules on the plan area or contiguous to the area.
E. Visual Resources: The visual assessment area is generally the logging area that is readily visible to significant numbers of people who are no further than three miles from the timber operation. To assess visual cumulative effects:
1. Identify any Special Treatment Areas designated as such by the Board of Forestry because of their visual values.
2. Determine how far the proposed timber operation is from the nearest point that significant numbers of people can view the timber operation. At distances of greater than 3 miles from viewing points, activities are not easily discernible and will be less significant.
3. Identify the manner in which the public identified in 1 and 2 above will view the proposed timber operation (from a vehicle on a public road, from a stationary public viewing point or from a pedestrian pathway).
F. Vehicular Traffic Impacts: The traffic assessment area involves the first roads not part of the logging area on which logging traffic must travel. To assess traffic cumulative effects:
1. Identify whether any publicly owned roads will be used for the transport of wood products.
2. Identify any public roads that have not been used recently for the transport of wood products and will be used to transport wood products from the proposed timber harvest.
3. Identify any public roads that have existing traffic or maintenance problems.
4. Identify how the logging vehicles used in the timber operation will change the amount of traffic on public roads, especially during heavy traffic conditions.

Note: Authority cited: Sections 4551, 4551.9 and 21080.5, Public Resources Code. Reference: Sections 4512, 4513, 4551.5, 4551.9, 4582.6, 21000(g), 21002 and 21080.5, Public Resources Code; Natural Resources Defense Council, Inc.v.Arcata Nat. Corp.(1976) 59 Cal.App.3d 959; 131 Cal.Rptr. 172; andLaupheimerv.State(1988) 200 Cal.App.3d 440; 246 Cal.Rptr. 82.






s 932.10. Pacific Yew.






s 933. Silvicultural Objectives.
The objectives of this article are to describe standard silvicultural systems and to provide for alternatives that when applied shall meet the objectives of the FPA (PRC 4512 and 4513). The RPF shall select systems and alternatives which provide for maximum sustained production of high quality timber products.
The THP shall designate one or a combination of regeneration methods, prescriptions or intermediate treatments described by this article. If a method, prescription or treatment not defined in the rules (see 14 CCR 895.1), is to be used an alternative prescription shall be included in the plan.
The assessment of maximum sustained production of high quality timber products is guided by:
(a) Regeneration methods, intermediate treatments and prescriptions described in the rules which establish standards. These methods, treatments, prescriptions, and standards shall not be utilized to permit harvesting of growing stock in a manner that will significantly delay reaching or maintaining maximum sustained production.
(b) Published yield tables or other tools which can be validated and which serve as a point of reference for evaluating and selecting silvicultural systems and their implementation.
(c) The Sustained Yield Plan. The SYP establishes the flow of forest products from managed timberlands, and shall demonstrate the achievement of maximum sustained production.
(d) An assessment of maximum sustained production of high quality timber products is not required for a harvest designated as, and meeting the definition of fuelbreak/defensible space under 14 CCR 913.4 [933.4, 953.4] Special Prescriptions. Because these lands are designated as defensible space areas, the wood production potential of these lands is compatible with the lowest site classifications and they shall be considered site IV timberland for stocking purposes.

Note: Authority cited: Sections 4551 and 4561, Public Resources Code. Reference: Sections 4551.5 and 4561, Public Resources Code.






s 933.1. Regeneration Methods Used in Evenaged Management.
The following types of regeneration methods are designed to replace a harvestable stand with well spaced growing trees of commercial species. Evenaged management systems shall be applied with the limitations described by this rule:
(a) Timber stands harvested under an evenaged regeneration method shall meet the following standards:
(1) Where a regeneration step harvest of evenaged management will occur on stands younger than 50 years of age for Class I lands, 60 years of age for Class II and III lands, or 80 years of age for Class IV and V lands, or equivalent age of trees, based on height, as determined according to the appropriate site class, the RPF preparing the THP or SYP must demonstrate how the proposed harvest will achieve MSP pursuant to 14 CCR s 933.11(a) or (b) provided, however, that the Director may grant an exemption from this section based upon hardship.
(2) The regeneration harvest of evenaged management shall be limited to 20 acres for tractor yarding. Aerial or cable yarding may be 30 acres. Tractor yarding may be increased to 30 acres where the EHR is low and the slopes are < 30%. The RPF may propose increasing these acreage limits to a maximum of 40 acres, and the Director may agree where measures contained in the THP provide substantial evidence that the increased acreage limit does any one of the following:
(A) by using additional on-site mitigation measures, reduces the overall detrimental effects of erosion thereby providing better protection of soil, water, fish and/or wildlife resources; or
(B) provide for the inclusion of "long corners", or
(C) create a more natural logging unit by taking maximum advantage of the topography; or
(D) will increase long-term sustained yield; or
(E) provide feasible off-site mitigation measures that can be incorporated in the plan to restore or enhance previously impacted resource areas or other environmental enhancements that will result in demonstrable net environmental benefits within the planning watershed. These measures may include, but are not limited to, watercourse restoration, soil stabilization, road surface stabilization, road outsloping, road abandonment, road reconstruction, enhancement of wildlife habitats and vegetation management.
To qualify for an exemption, the plan submitter is not required to demonstrate that other feasible options are not available.
(3) Evenaged regeneration units within an ownership shall be separated by a logical logging unit that is at least as large as the area being harvested or 20 acres, whichever is less, and shall be separated by at least 300 feet in all directions.
(4) Within ownership boundaries, no logical logging unit contiguous to an evenaged management unit may be harvested using an evenaged regeneration method unless the following are met:
(A) The prior evenaged regeneration unit has an approved report of stocking, and the dominant and codominant trees average at least five feet tall or are at least five years of age from the time of establishment on the site, either by the planting or by natural regeneration. If these standards are to be met with trees that were present at the time of the harvest, there shall be an interval of not less than five years following the completion of operations before adjacent evenaged management may occur.
(5) Except for the clearcut method, all trees to be harvested or all trees to be retained shall be marked by, or under the supervision of, an RPF prior to felling operations. A sample area shall be marked prior to a preharvest inspection. The sample area shall include at least 10% of the harvest area up to a maximum of 20 acres per stand type, and must be representative of the range of conditions present in the area. The marking requirement may be waived by the Director if the trees to be harvested are easily distinguished from the trees to be retained, when explained and justified by the RPF in the plan.
(6) Special consideration for aesthetic enjoyment shall be given to selection of silvicultural treatments and timber operations within 200 feet of the edge of the traveled surface of any permanent road maintained by the County or the State.
(7) Special consideration for aesthetic enjoyment and protection of adjacent stand vigor shall be given to the selection of silvicultural methods and timber operations within 200 feet of adjacent non-federal lands not zoned TPZ.
(b) Clearcutting. The clearcutting regeneration method involves the removal of a stand in one harvest. Regeneration after harvesting shall be obtained by direct seeding, planting, sprouting, or by natural seed fall. When practical, clearcuts shall be irregularly shaped and variable in size in order to mimic natural patterns and features found in landscapes. Site preparation and slash disposal measures, if necessary for successful regeneration, shall be described in the plan.
(c) Seed Tree. The seed tree regeneration method involves the removal of a stand in one harvest except for well distributed seed trees of desired species which are left singly or in groups to restock the harvested area. The seed step is utilized to promote natural reproduction from seed and to initiate the establishment of an evenaged stand. The removal step may be utilized to remove the seed trees after a fully stocked stand of reproduction has become established.
(1) Seed Tree Seed Step.
The seed tree seed step is the regeneration step and shall meet the following requirements:
(A) Retention of at least the following basal area of seed trees per acre which are 18 inches dbh or greater:
1. Fifteen square feet basal area on site I, II and III lands and
2. Twelve square feet basal area on site IV and V lands.
The seed trees must be of full crown, capable of seed production and representative of the best phenotypes available in the preharvest stand.
(B) No point within the logged area shall be more than 150 feet from a seed tree.
(C) Seed tree species and site preparation measures shall be specified in the plan by the RPF.
(D) Seed trees shall be marked by or under the supervision of an RPF prior to felling operations.
(E) If natural regeneration is inadequate within two years after the first August following completion of timber operations, seed trees may be harvested and artificial regeneration shall be used to meet the requirements of 14 CCR s 932.7(b)(1).
(F) In the absence of a Sustained Yield Plan, to maintain and improve tree species diversity, genetic material and seed production, trees of each native commercial species where present at the time of harvest shall be retained after harvest. These leave trees shall be representative of the best phenotypes available in the preharvest stand. The RPF may propose and the Director may agree to a species specific plan in the THP which protects existing regeneration or provides for regeneration in-lieu of retaining trees.
(2) Seed Tree Removal Step.
Not more than 15 predominant trees per acre may be removed in the seed tree removal step. Not more than 50 sq. ft. of basal area of predominant trees per acre may be removed in the seed tree removal step. The seed tree removal step may be utilized when the regeneration present exceeds the minimum stocking requirements set forth in 14 CCR s 932.7(b)(1). Regeneration shall not be harvested under the seed tree method unless the trees are dead, dying or diseased or substantially damaged during timber operations. The minimum stocking standards of 14 CCR s 932.7(b)(1) shall be met immediately upon completion of operations. The seed tree removal step shall only be used once in the life of the stand unless otherwise agreed to by the Director. If the extent and intensity of the soil and vegetation disturbance caused by the harvest is similar to what would have been caused by a clearcut, the size limitations, separation (spacing) by logical logging unit requirements, and yarding equipment limitations of 14 CCR s 933.1(a) are applicable.
(d) Shelterwood. The shelterwood regeneration method reproduces a stand via a series of harvests (preparatory, seed, and removal). The preparatory step is utilized to improve the crown development, seed production capacity and wind firmness of designated seed trees. The seed step is utilized to promote natural reproduction from seed. The removal step is utilized when a fully stocked stand of reproduction has become established, and this step includes the removal of the protective overstory trees.
The shelterwood regeneration method is normally utilized when some shade canopy is considered desirable for the establishment of regeneration.
(1) Shelterwood Preparatory Step. The shelterwood preparatory step shall meet the following minimum standards:
(A) At least the following basal area of seed trees per acre which are 18 inches dbh or greater shall be retained.
1. Thirty square feet basal area on site I, II and III lands and
2. Twenty four square feet basal area on site IV and V lands.
The seed trees must be of full crown, capable of seed production and representative of the best phenotypes available in the preharvest stand.
(B) No point within the logged area shall be more than 100 feet from a seed tree.
(C) Seed tree species shall be specified in the plan by the RPF.
(D) At least 100 square feet of basal area per acre on Site I lands, and 75 square feet of basal area per acre on Site II and III lands and 50 sq. ft. of basal area per acre on site IV and V lands shall be retained.
(E) The minimum stocking standards of 14 CCR s 932.7(b)(1) shall be met immediately upon completion of operations. Within six months following completion of work described in the plan, a report of stocking shall be filed as stated in PRC s 4587.
(2) Shelterwood Seed Step. The shelterwood seed step is the regeneration step and shall meet the following standards:
(A) At least the following basal area of seed trees per acre which are 18 inches dbh or greater shall be retained
1. Thirty square feet basal area on site I, II and III lands and
2. Twenty four square feet basal area on site IV and V lands.
The seed trees must be of full crown, capable of seed production and representative of the best phenotypes available in the preharvest stand.
(B) No point within the logged area shall be more than 100 feet from a seed tree.
(C) Seed tree species and site preparation measures shall be specified in the plan by the RPF.
(D) Seed trees shall be marked by or under the supervision of an RPF prior to felling operations.
(E) If natural regeneration is inadequate within two years after the first August following completion of timber operations, seed trees may be harvested and artificial regeneration shall be used to meet the requirements of 14 CCR s 932.7(b)(1).
(F) In the absence of a Sustained Yield Plan, to maintain and improve tree species diversity, genetic material and seed production, trees of each native commercial species where present at the time of harvest shall be retained after harvest. These leave trees shall be representative of the best phenotypes available in the preharvest stand. The RPF may propose and the Director may agree to a species specific plan in the THP which protects existing regeneration or provides for regeneration in-lieu of retaining trees.
(3) Shelterwood Removal Step. The shelterwood removal step may be utilized when the regeneration present exceeds the minimum stocking requirements set forth in 14 CCR s 932.7(b)(1). Unless otherwise agreed to by the Director, the Shelterwood removal shall only be used once in the life of the stand. Regeneration shall not be harvested during the shelterwood removal step unless the trees are dead, dying or diseased or substantially damaged by timber operations. The minimum stocking standards of 14 CCR s 932.7(b)(1) shall be met immediately upon completion of operations.
If the extent and intensity of the ground disturbance caused by the harvest is essentially the same as would have been caused by a clearcut or will cause adverse cumulative effects on wildlife as determined by the RPF or Director the size limitations, and separation (spacing) by logical logging unit requirements, of 14 CCR s 933.1(a) are applicable unless the post-harvest stand, regardless of average diameter, meets the stocking standards of 14 CCR s 933.3(a)(1)(A) or (B).

Note: Authority cited: Sections 4551 and 4561, Public Resources Code. Reference: Sections 4561, 4582(h) and 4587, Public Resources Code.






s 933.1.5. Regeneration Methods Used in Even-Aged Management and Limitations.

Note: Authority cited: Sections 4551, 4553, 4561, and 21160, Public Resources Code. Reference: Sections 4512, 4513, 4551.5, 4561 and 4582(h), Public Resources Code.






s 933.2. Regeneration Methods Used in Unevenaged Management.
Unevenaged management is utilized to establish and maintain an unevenaged stand structure. Unevenaged management attributes include the establishment and/or maintenance of a multi-aged, balanced stand structure, promotion of growth on leave trees throughout a broad range of diameter classes, and encouragement of natural reproduction.
(a) Selection. Under the selection regeneration method, the trees are removed individually or in small groups sized from .25 acres to 2.5 acres.
(1) Trees to be harvested or trees to be retained shall be marked by or under the supervision of the RPF prior to felling operations. When openings greater than .25 acres will be created, the boundaries of the small group(s) may be designated in lieu of marking individual trees within the small group areas. A sample area must be marked prior to a preharvest inspection for evaluation. The sample area shall include at least 10% of the harvest area up to a maximum of 20 acres per stand type which is representative of the range of conditions present in the area.
(2) Post harvest stand stocking levels shall be stated in the THP. The level of residual stocking shall be consistent with maximum sustained production of high quality timber products. In no cases shall stocking be reduced below the following standards:
(A) Selection System.
1. On Site I lands at least 100 square feet per acre of basal area shall be retained.
2. On Site II and III lands at least 75 square feet per acre of basal area shall be retained.
3. On Site IV and V lands at least 50 square feet per acre of basal area shall be retained.
4. Unless the plan submitter demonstrates how the proposed harvest will achieve MSP pursuant to 14 CCR s 933.1(a) or (b), the residual stand shall contain sufficient trees to meet at least the basal area, size, and phenotypic quality of tree requirement specified under the seed tree method.
(B) Group Selection.
1. At least 80% of the stocked plots must meet the Basal Area standards of 14 CCR s 933.2(a)(2)(A).
2. Not more than 20% of the stocked plots may meet stocking standards utilizing the 300 point count standard with trees that are at least 10 (ten) years old.
3. An RPF or supervised designee may offset up to 8 plots per 40 plots where those plot centers are initially placed within small group clearings created during the current harvest. Unless substantially damaged by fire, the RPF or supervised designee shall not exclude small group clearings created by previous timber harvesting from the stocking survey.
4. Unless the plan submitter demonstrates how the proposed harvest will achieve MSP pursuant to 14 CCR s 933.11(a) or (b), the residual stand shall contain sufficient trees to meet at least the basal area, size, and phenotypic quality of tree requirement specified under the seed tree method.
(3) Within any THP, small group clearings under the selection method shall be separated by a logical logging area.
(4) Following completion of timber operations (including site preparation) not more than 20 percent of the THP area harvested by this method shall be covered by small group clearings.
(5) Exceptions to stocking standards in 14 CCR s 933.2(a)(2) above may be granted only when proposed by the RPF and explained and justified in the plan, but in no case will the exceptions be less than those specified in 14 CCR s 932.7(b)(2). Exceptions may only be granted when the RPF clearly demonstrates that the existing stand will grow substantially less than both the potential site productive capacity and the proposed post harvest stand.
(b) Transition. The transition method may be used to develop an unevenaged stand from a stand that currently has an unbalanced irregular or evenaged structure. The transition method involves the removal of trees individually or in small groups from irregular or evenaged stands to create a balanced stand structure and to obtain natural reproduction.
(1) Area for determination of preharvest seed tree retention levels shall be no greater than 20 acres in size.
(2) This method is to be used to increase stocking and improve the balance of age classes so as to allow the residual stand to be managed by the selection regeneration method. This method shall not be used more than two times for a stand. The RPF shall delineate areas previously treated by the transition method on the plan map.
(3) Stands suitable for the transition method contain adequate quantity and quality of seed producing trees to provide adequate regeneration for new age classes. Stands suitable for this method shall have no more than 50 sq. ft. of basal area greater than the selection basal area standards.
(4) Trees to be harvested or trees to be retained shall be marked by or under the supervision of a RPF before felling operations. A sample area must be marked before the preharvest inspection for evaluation. The sample area shall include at least 10% of the harvest area up to a maximum of 20 acres per stand type which is representative of the range of conditions present.
(5) Immediately following the completion of timber operations, the minimum basal area standards in 14 CCR s 932.7(b)(2) shall be met.
(6) The post harvested residual stand shall contain at least 15 square feet of basal area per acre of seed trees at least 12 inches dbh or greater for timber sites I, II or III; or 12 square feet of basal area per acre of seed trees 12 inches dbh or greater for timber sites IV or V. Unless obviously stocked, these basal area requirements will be determined from sampling averaged across each harvested area required in 14 CCR s 933.2(b)(1). Unless the plan submitter demonstrates how the proposed harvest will achieve MSP pursuant to 14 CCR s 933.11(a) or (b), where present in the preharvest stand, disease free, undamaged seed trees 18 inches dbh or greater shall be retained post harvest until the stand exceeds the minimum seed tree requirements of 14 CCR s 933.1(c)(1)(A). The seed trees shall be full crown, capable of seed production and representative of the best phenotypes available in the present stand.
(7) Following completion of timber operations (including site preparation) not more than 20 percent of the Plan area harvested by this method shall be occupied by small group clearings.
(8) The Plan Submitter must provide the Director sufficient information such as growth and stand description to demonstrate that the standards of the selection regeneration method will be met by the third and subsequent entries of Plan areas harvested by the transition method.
(c) Within six months following completion of timber operations conducted pursuant to the selection and transition methods as described in the plan, a report of stocking shall be filed as stated in PRC Section 4587.
(d) In the absence of a Sustained Yield Plan, to maintain and improve tree species diversity, genetic material, and seed production, trees of each native commercial species where present at the time of harvest shall be retained after harvest. These leave trees shall be representative of the best phenotypes available in the preharvest stand. The RPF may propose and the Director may agree to a species specific plan in the THP which protects existing regeneration or provides for regeneration in-lieu of retaining trees.

Note: Authority cited: Sections 4551 and 4561, Public Resources Code. Reference: Sections 4561, 4582(h) and 4587, Public Resources Code.






s 933.2.5. Even-Aged Size Limits.

Note: Authority cited: Sections 4551, 4553 and 4561, Public Resources Code. Reference: Sections 4512, 4513, 4561, 4582(h) and 21001, Public Resources Code.






s 933.3. Intermediate Treatments.
(a) Commercial Thinning. Commercial thinning is the removal of trees in a young-growth stand to maintain or increase average stand diameter of the residual crop trees, promote timber growth, and/or improve forest health. The residual stand shall consist primarily of healthy and vigorous dominant and codominant trees from the preharvest stand.
(1) Post harvest stand stocking levels shall be stated in the THP. The level of residual stocking shall be consistent with maximum sustained production of high quality timber products. Generally stands will develop stand structures with considerably higher levels of basal area than provided in these minimum standards as stand age increases. In no case shall stocking be reduced below the following standards:
(A) Where the preharvest dominant and codominant crown canopy is occupied primarily by trees greater than 14 inches DBH:
1. On Site I mixed conifer lands at least 125 sq.ft. per acre of basal area shall be left, and on Site I lands where greater than 50% of the basal area is pine, at least 100 square feet per acre of basal area shall be left.
2. On Site II mixed conifer lands at least 100 sq.ft. per acre of basal area shall be left, and on Site II lands where greater than 50% of the basal area is pine, at least 75 square feet per acre of basal area shall be left.
3. On Site III mixed conifer lands at least 75 sq.ft. per acre of basal area shall be left, and on Site III lands where greater than 50% of the basal area is pine, at least 75 square feet per acre of basal area shall be left.
4. On Site IV and V mixed conifer lands, at least 50 sq.ft. per acre of basal area shall be left, and on Site IV and V lands where greater than 50% of the basal area is pine at least 50 square feet per acre of basal area shall be left.
(B) Where the preharvest dominant and codominant crown canopy is occupied primarily by trees less than 14 inches DBH, a minimum of 100 trees per acre over 4 inches DBH shall be retained for site I, II and III. For site IV and V 75 trees per acre over 4 inches DBH shall be retained.
(2) Exceptions to these stocking standards may be proposed by the RPF when explained and justified in the plan, but in no case will the standards be below those specified in 14 CCR 932.7(b)(2). (continued)