Harris Vegetation Management Soils Report
United States
Department of
Agriculture
Forest
Service
August 2013
Final Soils Specialist
Report
Harris Vegetation Management Project
Shasta-Trinity National Forest
Shasta-McCloud Management Unit
Shasta County, California
(Harris Guard Station on Ovall soils)
Prepared by
Brad Rust & Tricia Burgoyne Date
Forest Soil Scientist and TEAMS Soil Scientist
Shasta-Trinity National Forest and TEAMS
Harris Vegetation Management Soils Report
TABLE OF CONTENTS
1.1 Introduction ............................................................................................................................... 1
1.1.1 Regulatory Framework ....................................................................................................... 1 1.2 Methodology for Analysis ......................................................................................................... 2
1.3 Affected Environment ............................................................................................................... 3
1.4 Current Conditions .................................................................................................................... 6
1.4.1 Erosion ................................................................................................................................ 6 1.4.2 Soil Organic Matter............................................................................................................. 6 1.4.3 Soil Porosity ........................................................................................................................ 8
1.5 Environmental Consequences ................................................................................................. 12
1.5.1 Methodology ..................................................................................................................... 12 1.5.2 Spatial and Temporal Context for Effects Analysis .......................................................... 13 1.5.3 Assumptions ...................................................................................................................... 13 1.5.4 Resource Protection Measures .......................................................................................... 15 1.5.5 Desired Condition for all units .......................................................................................... 16 1.5.6 Alternative 1 – Proposed Action ....................................................................................... 17 1.5.7 Alternative 2 ..................................................................................................................... 22 1.5.8 Alternative 3 ..................................................................................................................... 22 1.5.9 Alternative 4a .................................................................................................................... 22 1.5.10 Alternative 4b ................................................................................................................... 23 1.5.11 Alternative 4c .................................................................................................................... 23 1.5.12 Alternative 5 – No Action ................................................................................................. 24
1.6 Summary ................................................................................................................................. 26
1.7 Compliance with the Forest Plan and Other Regulatory Direction ......................................... 27
1.8 References ............................................................................................................................... 28
2. APPENDIX A. EROSION HAZARD RATING CALCULATIONS .................................................... 33
3. APPENDIX B. CUMULATIVE EFFECTS TABLE ............................................................................. 35
4. APPENDIX C. SUMMARY OF FIELD WORK-CURRENT CONDITION ........................................ 38
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employer.
Harris Vegetation Management Soils Report
3
5. APPENDIX D. SDM TRANSECTS ...................................................................................................... 40
LIST OF TABLES
Table 1. Physical properties of Harris Vegetation Management project area soils ......................... 4
Table 2. Harris Windrow Sampling Data ......................................................................................... 4
Table 3. Soil disturbance monitoring on Selected Impacted Sites……………………………… 10
Table 4. Soil compaction monitoring on Shasta-Trinity National Forest from 2002 to 20102….. 11 Table 5. Recovery rates for mechanical understory thinning soils ................................................ 14 Table 6. Resource protection measures for soils ............................................................................ 15 Table 7. Fuel treatments and their qualitative effect on soils......................................................... 18 Table 8. Comparison of alternatives .............................................................................................. 24 Table 9. Comparison of alternatives for soil resources .................. Error! Bookmark not defined. Table 10. EHR for Harris Vegetation Management project area soils ........................................... 33 Table 11. Soil effects by proposed treatment unit for the Harris Vegetation Project ................... 35 Table 12. Current conditions of Harris soils from field surveys .................................................... 38
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 1
1.1 INTRODUCTION
This report evaluates the soil conditions and discloses the potential direct, indirect and
cumulative effects of the alternatives for the Harris Vegetation Management Project. This report
includes:
Analysis methods and scale;
Affected environment, including current conditions that describe the lasting effects and influence of
past land management; and
Environmental consequences, including direct, indirect and cumulative effects in light of past, present
and reasonably foreseeable future events.
The project area encompasses approximately 2,800 treatment acres of federal lands within the
Shasta Trinity National Forest northeast of McCloud, California. The Harris Vegetation
Management Project is designed to improve forest health, develop late successional forest, and
restore fire-adapted ecosystem characteristics.
The Harris Vegetation Management Project would comply with the Shasta Trinity Land and
Resource Management Plan (Forest Plan) standards for long-term soil productivity. The
proposed silvicultural and fuel treatments in each alternative are not expected to adversely affect
soil resources because of soil protection measures that will be implemented as part of each
management alternative. These protection measures will help to ensure that resource safeguards
will be in place that would prevent adverse effects on the soil resource from occurring. Where
effects cannot be avoided, mitigation is planned in order to minimize or negate detrimental levels
of soil disturbance.
Regulatory Framework 1.1.1
Management actions must occur in conformance with applicable law, regulation, policy,
guidance, and management direction. This regulatory framework determines the overall
objectives and standards and guidelines applied to project activities and resource management.
Elements specifically relevant to the soil resource are described here.
Specific measures, indicators, and thresholds are established in assessing soil condition, and for
evaluating the effects of the proposed project on the soil resource- what gets looked at, why, and
interpretation of what it means to soil quality and site productivity. The Shasta Trinity National
Forest Land and Resource Management Plan (Forest Plan) (1995b) includes forest-wide
standards that has a goal to maintain or improve soil productivity and prevent excessive surface
erosion, mass wasting, and cumulative watershed impacts. Measures should be taken to avoid
adverse effects to soil conditions and to evaluate management effects on soil productivity, soil
hydrologic function and soil buffering capacity. For this project, all evaluations of soil
productivity also address concerns of hydrologic function and buffering capacity. Hydrologic
function is discussed in the hydrology report. Soil buffering capacity is directly proportional to
the amount of organic matter in soil and humus and relates to cation exchange capacity. Coarse
wood, surface organics (duff or litter), and soil organic carbon (SOC) directly relate to buffering
capacity.
The National Soil Management Handbook defines soil productivity and components of soil
productivity, and establishes guidance for measuring soil productivity. In determining a
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 2
significant change in productivity, a 15% reduction in inherent soil productivity potential will be
used as a basis for setting threshold values. Threshold values would apply to measurable or
observable soil properties or conditions that are sensitive to significant change. The threshold
values, along with areal extent limits, would serve as an early warning signal of reduced soil
productive capacity, where changes to management practices or rehabilitation measures may be
warranted.
Management activities have potential to cause various types and degrees of disturbance. Soil
disturbance is categorized into compaction, displacement, puddling, severe burning, and erosion.
Direction was established that properties, measures, and thresholds relative to these disturbance
types would be developed at the Regional and Forest levels, known as Soil Quality Standards
(SQS).
The Shasta-Trinity National Forest Land and Resource Management Plan (LRMP) establishes
Forest-wide management direction, and Standards and Guidelines in carrying out project
activities. Management direction pertaining to soils includes the following:
• Develop specific soil evaluation and mitigation measures for each project that has the
potential to impact the soil resource.
• Develop and apply erosion control plans to road construction, mining, recreation
developments, and other site disturbing projects. Use the Soils and Geologic Resource
Inventories for predicting the need and extent for erosion control measures.
• Identify and evaluate areas of known or suspected instability as a part of project planning.
Protect areas with a high probability of mass wasting from ground disturbing activities.
• Protect long-term soil productivity in controlled burn prescriptions and by meeting
aquatic conservation strategy objectives.
• Logging Systems: generally confine tractor logging to sustained slopes of less than 35
percent. When possible, limit skid trails to 15 percent of the harvest area and tractor slash piling
to the dry season.
1.2 METHODOLOGY FOR ANALYSIS
During July of 2009, the TEAMS soil scientist evaluated all units with a history of soils
disturbance, and many units without any sign of disturbance were also surveyed. For the soil
resource, the treatment unit serves as the analysis area, as we do not expect activities within units
to influence soil characteristics outside of unit boundaries.
In order to evaluate soil quality, a site-specific assessment of soil quality indicators has been
conducted within the analysis area.
In each unit, the following indicators were examined:
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 3
Percent detrimental1 soil disturbance: decrease in soil porosity, or increase in soil bulk density, that
impairs site productivity, soil displacement, severe soil burning, lack of adequate cover, rutting, or
lack of large woody debris (LWD);
Percent cover by category: rock, wood, vegetation, and litter;
Down woody debris (tons per acre);
Litter and duff depths;
Percent of rock in the uppermost soil horizon; and
Slope stability, erosion concerns and other soil issues.
Please see the project record for unit-specific field notes and specific methods used for sampling.
The sampling protocol used was the Forest Soil Disturbance Monitoring Protocol (Page-
Dumroese et al 2009a).
Since then the Shasta-Trinity National Forest (STNF) has adopted the Forest Soil Disturbance
Monitoring Protocol (Page-Dumroese, et. al. 2009) which is a multi-faceted approach to soil
disturbance and forest sustainability. The STNF has incorporated validation sampling (using
transects to measure erosion, disturbance, compaction, displacement, and cover (Rust 2011) as a
component of the soil monitoring protocol.
The STNF used the Forest Soil Disturbance Monitoring Protocol (FSDMP) developed by USFS
Region 1 and the Rocky Mountain Research Station to provide a standard inventory, monitoring,
and assessment tool. This method uses paced transects with “toe-point” sampling combined with
qualitative indicators of disturbance. At each point, spade holes are used to assess soil
disturbance classes by looking at forest-floor attributes (cover, vegetation, woody debris),
surface-soil attributes (displacement, erosion, ruts, burn severity), and subsurface attributes
(compaction, platy and massive structure). After porosity, surface woody debris (large woody
debris, fine slash, organic matter, and other visual signs of disturbance i.e. ruts, piles of soil,
wheel tracks, erosion, burning, displaced topsoil, etc.) are evaluated, each sample point is ranked
according to the FSDMP classification system. Bulk density samples are used to validate if
detrimental effects have occurred or not, along with tree growth and lack of surface cover and
vegetation. Extent of platyness, penetration resistance (cone penetrometer readings >3000 kpa),
rutted terrain, and topsoil displacement are also used. Taken together a call is made in the field
initially and adjusted if necessary after bulk density samples are analyzed and penetrometer
readings are processed. Doing the validation sampling was a step that the STNF added to the
process to confirm field calls and develop one’s ability to make proper calls in the field. It also
provides additional data to support the FSDMP.
1.3 AFFECTED ENVIRONMENT
The Harris Vegetation Management Project area encompasses 9,200 acres on the Shasta Trinity
National Forest in the Shasta-McCloud Management Unit in the McCloud Ranger District. The
project area is located approximately 23 miles northeast of the city of McCloud, CA. The
vegetation in the area is predominately mixed conifer with some pure fir stands. Stands of
ponderosa pine and Douglas fir are also common. Elevation ranges from 4,400 to 5,600 feet.
1
Detrimental soil disturbance refers to either decrease in porosity of greater than 10%, or greater than 2 inches of topsoil displaced, eroded, or
severely burned, or lack of large woody debris of less than 5 trees per acre with some or all occurring over the project unit greater than 15% or the area.
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 4
This area is typified by buttes and cinder cones (with up to 45 percent slopes) separated by
nearly level glacial outwash terraces and lava flows. Virtually no surface water exists within the
project area. The climate in the project area is characterized by cool, wet winters and warm dry
summers with an average annual precipitation of 48 inches, with most precipitation falling
between October and May (Western Regional Climate Center 2010).
The soils in the project area (Table 1) are terrace and cinder cone soils that are deep and gravelly
with sideslope and lava flow soils that are moderately deep and well drained. Soils are generally
derived from volcanic materials from lava flows, pyroclastics, mudflows, ash deposition and
pumice deposition. The soils are generally coarse textured with a range of coarse fragments, are
deep to moderately deep and are well drained (Lanspa 1994). Areas of low lying outwash
terraces (Ovall soils) have depressions of fine-textured riparian soils (Morical and Aquic
Xerofluvents).
Table 1. Physical properties of Harris Vegetation Management project area soils
Soil Name Texture
Rock
fragments
(%)
Deptha
Compaction
Ratingb
Acres % of project
area
Ash derived soils
Germany Family Medial (SL) 10-50 Moderate Moderate 4074 44
Germany Family, Deep
Medial (SL) 10-40 Deep Moderate 340 4
Ledmount Family Medial (fSL) 10-35 shallow Moderate 1621 18
Revit Family Medial (fSL) 0-30 moderate High 110 1
Yallani Family Medial-skeletal (cSL)
35-60 deep Moderate 136 1.5
Coarse-ashy soils
Neer Family Medial-skeletal (SL)
30-70 Moderate Low 1 <1
Sheld Family Medial-skeletal (SL)
35-65 Deep Low 632 7
Washougal Family Medial-skeletal (L) 20-80 Moderate Low 260 3
Riparian soils
Ovall Family, Ponded
Coarse-loamy (SL)
0-35 Deep Moderate 1644 18
*Morical Family Fine-loamy (SCL) 0-15 Deep High Minor soil
*Aquic Xerorthents Fine-loamy(SiL) 0-5 Deep High Minor soil
Rock Outcrop 352 4
Total 9170
a - Depth classes are: Very Shallow - <10 inches, Shallow - 10-20 inches, Moderate - 20-40 inches, Deep - 40-60 inches. b - Based on R-5 soil interpretations (USDA, 1999); * - possible wetlands but these areas dry out in the summer so they do not support wetland vegetation. They have hydric indicators but the season of ponding is too cold for vegetative growth before it dries out in the summer.
Soils vary in their susceptibility to erosion, compaction, displacement, and soil-burn-severity.
For the Harris Project area erosion is generally low due to mild slopes and good soil cover. Many
of the soils within the project area are more resilient to compaction with 20-35 percent of coarse
fragments (rock content) in the mineral soil profile. Rock content is an indicator of the
susceptibility of compaction on a specific soil type. Rock content over 35 percent will greatly
reduce the effect of mechanical compaction. Fine textured ashy soils (Revit & Morical Families)
with few rock fragments have a high compaction hazard. Other ashy soils have more sand
(Germany, Ledmount, and Yallani families) and are less susceptible to compaction.
Harris Vegetation Management Soils Report
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The soils in the project area generally have between 10 and 30 percent rock content which helps
to reduce the compaction hazard considerably, but does not eliminate it. Dry soils are less likely
to compact and have lower risk of compaction than moist soils (Welke and Fryles 2005). Fine
loamy and loamy soils have better water holding capacity and provide available water for plant
growth, increasing site productivity especially for Germany soils (Welke and Fyles 2005). Ovall
soils are coarse sandy soils with depositional fine-textured layered deposits that restrict water
infiltration and are seasonally ponded (see Figure 1 below). Ovall soils lack rock content and are
susceptible to compaction when wet or moist. Because low-lying areas are seasonally ponded the
potential exists for wetlands to form on the fine-textured soils (20% of map unit 240) but due to
cold winter temperatures, early season ponding, and rapid drying in the summer little wetland
vegetation is expressed, disqualifying them for wetlands (Appendix E).
Figure 1: Harris Project Soils
Mechanical soil displacement has occurred within the project area in four units (40,185,197,199).
The practice of “brush to trees” windrowing practiced in the 1950s to 1970s plowed brush fields
and soil into windrows displacing from 4 to 8 inches of topsoil. The windrows were subsequently
planted with conifers. Topsoil was scalped to tear out brush and to remove duff and seeds to
expose bare soil for planting. Windrowed brush was burned leaving large rows of topsoil rich in
soil organic matter.
71
240
69
69
71
69
295
71
166
71
166166
74
24069
167
166
73
240
74
357
333
253
247
253
295
333333
273
253
278
253
333
199
69
359
71
0 0.8 1.60.4
Miles 4
Legendharris_soilsSOIL_NAME, SOIL_MAP_U
Oval sandy loam Ponded
Germany loam
Ledmount sandy loam
Neer gravelly sandy loam
Revit fine sandy loam
Rock Outcrop
Sadie sandy loam
Sheld gravelly coarse sandy loam
Washougal gravelly sandy loam
Yallani sandy loam
harrislsr_bnd
Harris TS Project
Physical Science Dept.
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 6
1.4 CURRENT CONDITIONS
Logging in the Harris project area started in the early 1900s with railroad logging. Much of the
area was harvested as is reflected in the overall stand age. Review of the project area shows an
existing skid trail network in units that averages 10 percent. The upland area was not managed
until the 1970s. The Toad Mountain Allotment and the McCloud/Hambone allotment are both
within part of the project area and have been vacant for several years.
Erosion 1.4.1
Inherent potential for erosion is low. The slope is generally between 5 and 10 percent with some
small areas up to 20 percent. Ground cover by rock, litter, duff and vegetation was nearly
continuous in many places, averaging 91 percent over the units. Basal vegetative cover averaged
13 percent, organic matter 65 percent, rock 4 percent and wood 9 percent across the project.
An intact litter layer was found throughout the project area, with thicker and more effective
cover in the closed canopy forests versus the open shrubby areas. The litter layer was generally
loose, but the shallow duff layer was generally tighter and held together by fungal hyphae. This
duff layer provides excellent soil protection. Annual grasses, herbaceous vegetation, and even
rock fragments can also be a form of protection and may reduce rain drop impact on soils.
In assessing inherent erosion hazard ratings (EHR) an assumption is made about the ability of a
soil, with little or no vegetation cover, to withstand a precipitation event equivalent to the long-
term average occurrence of a 2-year, 6 hour storm. The severity of a soil’s erosion hazard depend
on a number of factors including the soil’s texture, water movement within the soil as well as
runoff potential, slope length, and (importantly) soil surface cover. Risk ratings vary from low to
very high with low ratings meaning low probability of adverse effects on soil and water quality if
accelerated surface erosion occurs. Moderate erosion hazard ratings mean that accelerated
erosion is likely to occur in most years and water quality impacts may occur. High to very high
erosion hazard ratings mean that effects to soil productivity and water quality are likely to occur
when accelerated erosion happens. Although two soil types within the project area (eight percent
of the total area) can potentially have high erosion hazard ratings, currently all of the erosion
hazard ratings for the Harris Vegetation Management Project area are low (appendix A). Please
refer to the hydrology section for a discussion on erosion and equivalent roaded acres for this
project.
Soil Organic Matter 1.4.2
The importance of soil organic matter cannot be overstated (Okinarian 1996, Jurgensen et al.
1997). This organic component contains a large reserve of nutrients and carbon, and it is
dynamically alive with microbial activity. The character of forest soil organic matter influences
many critical ecosystem processes, such as the formation of soil structure, which in turn
influences soil gas exchange, soil water infiltration rates and soil water-holding capacity. Soil
organic matter is also the primary site of nutrient recycling and humus formation, which
enhances soil cation exchange capacity and overall fertility.
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Monitoring of previous windrowing practices on the STNF shown in Table 2 have high levels of
soil displacement and low LWD counts as brush fields were converted to plantations.
Additionally these same plantations have truncated topsoil A horizons due to displacement of
topsoil into the windrows. There are four units within the Harris project area that were
windrowed (40, 185, 197, and 199).
The monitoring compared windrowed (wr) trees to inter-bay (ib) trees to see if surface duff and
partial topsoil scalping from windrowing has affected soil productivity (see Table 2 below). On
the average 3 to 6 inches of topsoil was scraped off when brush fields were converted to
plantations in the 1960’s and 1970’s. This topsoil was pushed into windrows and then brush was
burned leaving soil mounds in rows from 90 to 150 feet apart. Measurements of tree height, age,
and diameter breast height (DBH) were used as a relative indicator of site soil productivity.. For
Germany soils windrow trees on the average on 2 windrowed units were 126 feet tall for 36 year
old trees where inter-bay trees were 96 feet tall for 36 year old trees. DBH for windrow trees was
20 inches where inter-bay trees were 16 inches. The difference between windrow trees and inter-
bay trees was 30 feet in height and a 4 inch DBH. For Shasta soils windrow trees on the average
on 2 windrowed units were 86 feet tall for 47 year old trees where inter-bay trees were 80 feet
tall for 47 year old trees. DBH for windrow trees was 20 inches where inter-bay trees were 15
inches. Difference between windrow trees and inter-bay trees was 6 feet in height and a 5 inch
DBH. Germany soils on a whole are more productive than Shasta, Washougal, or Sadie soils due
to higher available water holding capacities and higher soil organic matter explaining bigger
trees at an earlier age. But in all cases when topsoil was scalped from windrowing, the windrow
trees benefited (more nutrients, moisture, and space) from the topsoil and the inter-bay trees,
suffered.
Table 2: Windrow Sampling Data
The loss of these processes, due to windrowing has direct effect on site productivity and
sustainability. Organic matter is the one component of the soil resource that, if managed
Unit Age Site Characteristics Location
Topsoil depth (undist. A)
(inches)
Topsoil depth (dist. A)
(inches)
WR distance
(feet)
Tree height
(feet)
DBH
(in)
Height differ.
(feet)
DBH differ.
(inches)
Elk 1 36 flat (0-5%) Germany wr 6 140 134 20
(Elk unit 6 LSR area) ib 3 109 17 25 3
Elk 2 36 flat (0-5%) Germany wr 8 150 118 20
(Elk unit 14 LSR area) ib 3 82 15 36 5
CC1 47 flat (0-5%) Shasta wr 8 90 89 20
(Clear Ck, Pilgrim Ck. area) ib 4 86 14 3 6
CC2 47 flat (0-5%) Shasta wr 8 150 86 20
(Clear Ck, Pilgrim Ck. area) ib 3 74 16 12 4
SH1 45 sloping (5-15%) Washougal wr 10 90 69 18
(Spring Hill - Mt. Shasta) ib 6 69 15 0 3
SH2 45 sloping (5-15%) Washougal wr 10 90 62 18
(Spring Hill - Mt. Shasta) ib 6 62 15 0 3
AL8 36 sloping (5-15%) Sadie wr 8 135 79 18
(Algoma Unit 8 - Tate Ck) ib 3 67 14 12 4
BC1 39 rolling (15-40%) Washougal wr 6 150 72 16
(Big Canyon unit 3-160) ib 3 67 12 5 4
Windrow Sampling - sampled Shasta, Germany, Sadie, and Washougal windrow and interbay locations on the McCloud Flats and West Mt. Shasta
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 8
correctly, can actually be improved by human activity. Manipulation of the organic constituents
of the soil may be the only practical tool available for mitigating effects of harvesting systems
that remove standing trees and dead and down trees, or cause extensive soil disturbance. To
protect the sustainable productivity of the forest soil, a continuous supply of organic materials
should be provided, particularly in harsh environments (Harvey et al. 1987). The four units with
soil windrows would have soil redistributed to improve soil productivity in the Harris project.
1.4.2.1 Soil Wood
Residue left after advanced brown-rot decay is a brown, crumbly mass composed largely of
lignin. In healthy forest ecosystems, especially coniferous forests, the upper-most soil horizon
contains a significant portion of brown-rotted wood residues. The sponge-like properties of
advanced brown-rotted wood act as a moisture wick. Because of the high lignin concentrations,
and low carbohydrate rates, soil wood persists in the forest for a long time (Blanchette 1995).
The soil wood in the Harris Vegetation Management Project area is generally adequate. Soil
cover from organic matter is nearly continuous throughout the project area except old skid trails
and landings. Even where cover is naturally patchy, such as in woodland and shrub vegetation
types, soil cover standards are met (well exceeding 50 percent as described above). Average
observed depth of litter is 2 cm and duff is 2 cm also but total organics range from 1 cm to 13
cm. The thin litter and duff layer in this area is likely due to high rates of decomposition and the
organic matter is most likely incorporated in the top soil horizon and to areas that were
windrowed and in plantations. In addition to cover directly on the soil surface, most locations
within the project area have a canopy cover of perennial, live vegetation which serves as a
relatively continuous source of replenishment for soil organic matter. Also charcoal is found in
all the units indicating this ecosystem experiences fire and may therefore have shallower
litter/duff layers overall.
Currently, coarse woody debris (CWD) greater than 20 inches in diameter is relatively sparse
throughout the entire project area which is consistent with historic fire regime for the area
(Skinner 2002, McIver et. al. 2012). The quadratic mean diameter of project stands ranges from
about 9.4” to 14.4” (Silviculture Report p. 41-42). Because of the stand age and average tree
sizes, the availability of trees larger than 20” is limited. Remnant large diameter trees and snags
are present, although these size classes are under-represented on the forest floor in most surveyed
units.
Soil Porosity 1.4.3
Soil porosity refers to the amount and character of void space within the soil. In a “typical” soil
approximately 50 percent of the soil volume is void space. Pore space is lost primarily through
mechanical compaction. Three fundamental processes are negatively impacted by compromised
soil pore space: 1) Gas exchange; 2) Soil water infiltration rates; and 3) Water holding capacity.
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 9
1.4.3.1 Gas Exchange
Soil oxygen is fundamental to all soil biologic activity. Roots, soil fauna, and fungi all respire,
using oxygen while releasing carbon dioxide. When gas exchange is compromised, biologic
activity is also compromised. Maintaining appropriate soil biologic activity is paramount when
considering long-term forest vitality. 1.4.3.2 Soil Water Infiltration Rates and Water Holding Capacity
Soil compaction can reducewater infiltration, leading to overland flow and associated erosion,
sediment delivery, spring flooding, and low summer flows. Roads, primary skid trails, and
landings have the most compaction. Timing of operations is key since activities on moist soils
can cause compaction and puddling. Operations on dry or frozen soils helps maintain the soil’s
natural ability to quickly restore pore spaces. Available water holding capacity is compromised
by compaction since less water infiltrates to be held for plant growth.
In the Harris Vegetation Management Project area, compaction was found on existing skid trails
in most of the treatment units. In units 55, 176, 187, 189, 192, 194, and 200, skid trails occupy
15 percent of the unit and up to 35 percent in unit 194. It is important to note that the skid trails
have varying degrees of soil compaction depending on whether they were used as a primary,
secondary, or tertiary skid trail.
Generally coarse fragments in the Harris project area range from 20-35 percent coarse fragments
with a sandy loam texture. Soils with higher ash content also have increased susceptibility to
compaction. Several units in the project area have a pumice overburden, which are less
susceptible to compaction damage.
Riparian soils (Morical and Aquic Xerofluvent) are seasonally wet with stratified outwash layers
that pond water and provide potential habitat for wetland vegetation. But due to cold winter
seasons, shading from timber, and rapid drying during the summer wetlands are very limited in
the Harris Vegetation Management Area (see Appendix E).
Overall, approximately 37 percent of the treatment units had slight disturbance between 0 and 5
percent, 32 percent had moderate disturbance (between 6 and 12 percent) soil disturbance, and
the remaining 13 percent were highly disturbed. Currently, two proposed treatment units (42 and
200) exceed the forest plan standards for compaction in subsurface soil at the 4 to 8 inch depth
and three units (181, 186, and 193) are right at the threshold. Observed detrimental disturbance
due to compaction was associated with old primary skid trails, landings, and user created trails.
Average areal extent of detrimental compaction observed within ground-based treatment units
was about 7 percent (within a general range of 0-15 percent). Detrimental soil compaction is
measured by a 10 percent decrease in porosity.
Based on these initial findings further analysis was conducted to determine if the disturbance
correlated to detrimental soil conditions that affect soil productivity. Sampling was conducted in
2011 (Table 3 below) using the Forest Soil Disturbance Monitoring Protocol (Page-Dumroese,
et. al. 2009) on units previously identified as over or near soil disturbance thresholds (see
Appendix C).
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 10
Table 3 – Soil Disturbance Monitoring on Selected Impacted Sites (Appendix C)
Taking the average soil disturbance of the selected impacted sites above, shows only 5% of the
area is detrimentally disturbed. Units 42 and 181 are near threshold levels and only unit 200
exceeded soil compaction threshold levels. Units 42 and 181 occur on Germany soils and bulk
density samples show decreases in soil porosity on 8 to 10% of the units. Unit 200 occurs on
Oval soils and bulk density samples show decrease in soil porosity exceeding threshold levels on
12% of the unit.
Monitoring from the STNF National Forest (Rust 2009b, Foss 2010) from 2001 to 2010 found
that when soils are dry2 to 8 inches, detrimental compaction does not occur. Resource protection
measures restricting operation during wet weather have been effective according to monitoring
results on the forest (Table 4).
2 Dry is defined as “when soils are dry (generally less than 18% soil moisture) enough to operate mechanical
equipment without causing detrimental soil impacts of erosion, compaction, puddling, or displacement.”
Unit Proportion 0's Proportion 1's Proportion 2's Proportion 3's
Detrimental
Proportion
20 0.05 0.89 0.06 0.00 0.00 0.04 0.00
25 0.02 0.97 0.02 0.00 0.00
26 0.00 0.98 0.02 0.00 0.02
27 0.02 0.94 0.04 0.00 0.04
28 0.03 0.97 0.00 0.00 0.00
35 0.00 0.98 0.02 0.00 0.00
39 0.03 0.97 0.00 0.00 0.00
42 0.00 0.93 0.06 0.01 0.00
54 0.09 0.86 0.05 0.00 0.00
55 0.11 0.86 0.03 0.00 0.00
181 0.01 0.90 0.09 0.00 0.00
192 0.00 0.97 0.03 0.00 0.00
193 0.01 0.94 0.04 0.00 0.00
200 0.00 0.87 0.06 0.06 0.00
Average: 0.03 0.93 0.04 0.01 0.00
Soil Type Disturbance Moist Wt. Dry Wt. % Moist. Bd (g/cm) Porosity % Porosity ∆,% Threshold BD
0 134.60 116.90 15.14 0.87 64.40 0.00
1 154.70 135.20 14.42 1.01 58.83 8.65
2 185.25 161.63 14.62 1.21 50.79 21.15
0 142.50 121.25 17.53 0.90 63.08 0.00
1 157.25 134.00 17.35 1.00 59.20 6.15
2 172.00 142.00 21.13 1.06 56.76 10.02
0 135.38 116.88 15.83 0.87 64.41 0.00
1 154.13 132.50 16.32 0.99 59.65 7.39
2 168.00 143.00 17.48 1.07 56.46 5.36
3 192.00 166.00 15.66 1.24 49.45 23.22
0 138.00 117.33 17.61 0.88 64.27 0.00
1 149.83 126.67 18.29 0.94 61.43 4.42
2 164.17 139.50 17.68 1.04 57.52 6.36
3 194.50 164.50 18.24 1.23 49.91 22.35
166 - Ledmount 1.03
240 - Ovall 1.03
Harris Unit Average by Soil Type
Estimated Soil Disturbance Class
69 - Germany 1.03
71 - Germany 1.06
Harris Soil Disturbance
Averages
Proportion 0's
Proportion 1's
Proportion 2's
Proportion 3's
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 11
Table 4. Soil compaction monitoring on Shasta-Trinity National Forest from 2002 to 2012
Project Soil
1
U D ST U D ST
Timber Sales (25 ea)
Iron Cyn I - moist Boomer F-L (Post)* 34.0 32.0 34.0 0.0 8.7 11.1
Iron Cyn II Boomer F-L (Pre) 67.0 22.0 11.0 0.0 1.5 7.4
Boomer F-L (Post)* 16.0 60.0 24.0 0.0 1.0 8.1
Browns - moist Forbes F-L (Pre) 51.0 29.0 20.0 0.0 9.0 11.0
Browns2 - moist Forbes F-L (Pre) 62.0 24.0 14.0 0.0 7.0 20.0
Forbes F-L (Post)* 50.0 28.0 22.0 0.0 6.0 8.0
Professor Neuns L-Skl (Pre) 96.0 0.0 4.0 0.0 0.0 3.0
Neuns L-Skl (Post)* 55.0 27.0 18.0 0.0 4.7 4.8
Pettijohn - moist Forbes F-L (Pre) 55.0 23.0 22.0 0.0 3.8 9.7
Gemmil Hugo F-L (Pre) 66.0 17.0 17.0 0.0 3.4 8.2
Salt Holland F-L (Pre) 53.0 27.0 20.0 0.0 2.0 2.0
Reynolds Basin - moist Boomer F-L (Pre) 68.0 25.0 7.0 0.0 1.2 5.4
Boomer F-L (Post)* 39.0 26.0 18.0 0.0 4.6 12.0
McCloud Black Stain Holland F-L Ashy (Pre) 48.0 31.0 21.0 0.0 2.6 10.3
Shasta Co-L (Pre) 42.0 39.0 19.0 0.0 5.1 9.0
Algoma Holland F-L Ashy (Pre) 41.0 50.0 9.0 0.0 3.7 8.9
Sadie Loam (Pre) 57.0 34.0 9.0 0.0 6.3 13.4
Davis2 Holland F-L Ashy (Post)* 34.0 44.0 22.0 0.0 1.8 15.0
Germany Loam (Post)* 35.0 42.0 23.0 0.0 7.2 8.9
Edson Germany Loam (Post)* 2.0 71.0 27.0 0.0 8.1 16.3
Holland F-L Ashy (Post)* 5.0 73.0 22.0 0.0 4.8 14.0
Elk Shasta Co-L (Pre) 55.0 35.0 10.0 0.0 9.2 9.5
Flog Germany Loam (Post)* 3.0 76.0 22.0 0.0 12.0 14.0
Shasta Co-L (Post)* 0.0 79.0 21.0 0.0 11.0 13.0
Harris Germany Loam (Pre) 3.0 92.0 5.0 0.0 7.0 13.0
Hemlock Germany Loam (Post)* 77.0 22.0 1.0 0.0 5.7 8.4
Moosehead Holland F-L Ashy (Pre) 24.0 61.0 15.0 0.0 1.9 3.8
Germany Loam (Pre) 33.0 60.0 7.0 0.0 10.3 10.8
Mudflow Germany Loam (Pre) 38.0 42.0 20.0 0.0 3.3 10.5
Shasta Co-L (Pre) 67.0 27.0 6.0 0.0 0.5 1.8
Porcupine Holland F-L Ashy (Pre) 54.0 41.0 5.0 0.0 3.3 14.2
Germany Loam (Pre) 72.0 24.0 4.0 0.0 2.7 10.8
Beegum-C - moist Holland F-L (Pre) 60.0 28.0 12.0 0.0 2.0 4.0
Holland F-L (Post)* 48.0 32.0 20.0 0.0 8.0 13.0
E. Fork 2 Holland F-L (Post)* 52.0 33.0 15.0 0.0 2.1 4.3
Rattlesnake Holland F-L (Pre) 63.0 26.0 11.0 0.0 1.0 7.1
Trough Hugo F-L (Post)* 42.0 40.0 28.0 0.0 3.6 9.4
Soil Compaction Monitoring on Shasta-Trinity National Forest from 2001 to 2012
Disturbance2
Decrease in Porosity3
------------------------------------------%------------------------------------------
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 12
The main soil type found in the Harris Vegetation Management Project area is Germany and
these soils are much less compactable than Holland soils. Skid trails in the Harris Project are
compacted with an average of 13 percent decrease in porosity on 5 percent of the units.
Monitoring on the adjacent Klamath National Forest with similar soil types noted that while
compaction does occur on landings and main skid trails (usually only within about 200 feet of
the landings where multiple passes of machinery coalesce), it is generally less than 15 percent of
the unit (Laurent 2007). Areas on the Klamath where detrimental compaction was found were
effectively rehabilitated by subsoiling. The STNF has also incorporated subsoiling to reduce
compaction and improve infiltration on projects on the Shasta-McCloud Management Unit.
The table above shows soil compaction monitored projects from 2001 to 2012. Soil types are
listed from fine-loamy soils (Boomer, Forbes, Holland, and Hugo) to coarse soils (Neuns, Marpa,
Germany, Sadie, and Shasta) on tractor based slopes of 2 to 40%. Disturbance levels are noted as
U is undisturbed sites (SD0), D is areas with moderate levels of disturbance (SD1), and ST is
areas that have definite skid-trails (SD2&3). Breaking out fine textured (fine-loamy and loamy)
soils from coarse textured (coarse-loamy and loamy-skeletal) soils showed more post-harvest
skid-trails at threshold bulk density for fine soils vs. coarse soils, indicating fine textured soils
are more susceptible to compaction than coarse textured soils. This data shows on the average
across all soil types current mechanical harvesting operations decrease porosity on skid-trails
only by 1% from pre-harvest levels due to better equipment, effective BMPs, and site specific
mitigations. Total disturbance increased on an average of 12 to 15% using new harvest methods
but this disturbance is not detrimental. New harvest equipment is lighter on the ground but has a
bigger footprint.
1.5 ENVIRONMENTAL CONSEQUENCES
Methodology 1.5.1
Soil resources on the project area have been reviewed using soil survey data, data in GIS, and
field reconnaissance. Most of the units have been field reviewed by the soil scientist to verify
mapping, identify areas where soil productivity may be affected by proposed actions, and
examine current disturbance on site. Best management practices (BMPs) and resource protection
measures for soil protection in harvest units and along road segments are based on field data.
Effects analyses are based on the proposed silvicultural prescriptions and fuel treatments.
In determining a significant change in productivity, a 15 percent reduction in inherent soil
productivity potential will be used as a basis for setting threshold values. This 15 percent
reduction is generally considered a reduction of productivity over 15 percent of an area.
Threshold values would apply to measurable or observable soil properties or conditions that are
sensitive to significant change. The threshold values, along with aerial extent limits, would serve
as an early warning signal of reduced soil productive capacity, where changes to management
practices or rehabilitation measures may be warranted.
Management activities have potential to cause various types and degrees of disturbance. Soil
disturbance is categorized into compaction, displacement, puddling, severe burning, and erosion.
Direction was established that properties, measures, and thresholds relative to these disturbance
types would be developed at the Regional and Forest levels, known as soil quality standards.
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 13
The effects of each alternative on the soil resource have been assessed using the Region 5 Soil
Quality Standards and the Forest Plan. Soil quality analysis standards provide threshold values
that indicate when changes in soil properties and soil conditions would result in significant
change or impairment of the productivity potential, hydrologic function, or buffering capacity of
the soil. Forest Plan Standards and Guidelines for soils state that in an even-aged managed stand
no more than 15% of the area shall be in a nonproductive state (landings, roads, and main skid-
trails) on matrix lands (Forest Plan Chapter 4 section 4-25). These standards apply to the soil
project bounding area only (treatment units).
The best available science was used in analyzing the soils and the effects of the Harris
Vegetation Management Project. The most current and relevant reports were used. Studies and
monitoring were related to the specific project area.
Spatial and Temporal Context for Effects Analysis 1.5.2
The analysis area or bounding area, for direct, indirect, and cumulative effects for the soil
resource includes the proposed harvest units. This is the area that is expected to be directly
impacted by any silvicultural or fuel reduction activities. The Harris Vegetation Management
Project area is used to qualitatively discuss the past activities outside of proposed treatment units.
Please see the hydrology resource report for cumulative watershed effects.
The soil analysis includes the current environmental conditions as they reflect the aggregate
impact of both human and natural activities within the proposed treatment units. Many of the
past activities were not known prior to doing field surveys. GIS analysis prior to field surveys
did not have any past harvest activities documented in proposed units except for the plantations.
The evidence of railroad logging and yarding patterns are evident on the 1944 aerial photos.
The following units of measure will be used to describe the differences among alternatives.
Percent detrimental soil conditions from thinning and fuel operations, including skid trails, treatment
units, etc. post-activity will be evaluated by using pre-harvest conditions vs. proposed alternatives.
Number of units that have a high risk of exceeding soil quality standards with planned alternatives.
Assumptions 1.5.3
The effect of proposed activities have varying recovery rates depending on the degree of
disturbance, duration of disturbance effect, distribution of disturbance (pattern), and soil
variability. Soil compaction within the project area will vary depending on the existing
condition, type of harvest, equipment, and use of resource protection measures. Soil compaction
is reduced over the timeframe due to inputs from plant roots, other organics, and physical
weathering Table 4). Erosion recovery ranges from two to five years and fertility is one to three
years depending if the area has not been windrowed. Windrowed units that have topsoil removal
will begin to recover with windrow respreading.
The effect of management on soil recovery is dependent on soil type, climate, moisture, cover
and time. Different soil characteristics (erosion or compaction or fertility) have different
estimated recovery rates (Table 5). There are short term increases in erosion but over a two to
five year span those rates decrease. Reduced duff and dead woody material reduce fertility in the
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 14
short-term but recover quickly except areas windrowed. Residual trees will respond with
increased growth, root mass, soil organic matter and an overall increase of soil fertility when
released.
Table 5. Recovery rates for mechanical understory thinning soils
Soil Type Erosion Compaction Fertility
Ledmount 2-3 years 1-5 years 1-2 years
Sheld 1-2 years 1-2 years 1-2 years
Germany 2-3 years 10-20 years 1-2 years
Neer 2-3 years 5-10 years 2-3 years
Washougal 2-3 years 5-10 years 2-3 years
Ovall-ponded 3-5 years 5-10 years 1-2 years
Rust, 2009b and 2010, Foss 2010
Post thinning and fuel treatment activities should leave at least 50 percent of soil cover in the
form of duff, litter, slash, and large woody debris (LWD). Operations should minimize
disturbance to existing duff layer, maintaining as much of the existing duff onsite as possible.
Soil cover from duff, vegetation or surface rock fragments should be maintained to keep erosion
rates at natural levels. Where units exceed 15 percent areal extent from detrimental disturbance
from compaction, landings and the first 200 feet of primary skid trails should be subsoiled (deep
tillage) to reduce compaction.
Roads, landings or other transportation features would be treated to meet best management
practice (BMP) and water quality standards. Classified roads, borrow pits, and utility corridors
are a permanent commitment of resources and are not counted as detrimental soil disturbance as
they are not part of the productive land base.
The aerial extent for skid trails and landings would be 15 percent or less of an activity area
(generally a unit). Porosity (an expression of compaction) will not decrease by less than 10
percent over background levels through a unit (outside of dedicated skid trails and landings)
(Forest Plan, Appendix O - Soil Quality Standards).
The organic mat (fine slash less than 3 inches and duff layer) should be preserved as much as
operations allow. Maintaining this layer would moderate soil temperatures, nutrient processes,
soil biological health, and support the long term soil productivity. Retention of at least 50 percent
soil cover in the form of slash, duff, and litter would meet the Forest Plan tonnage requirement of
at least five tons per acre. Maintaining slash up to 50 percent has been shown to be beneficial for
forest regeneration by attenuating soil temperatures, increasing soil moisture, and reducing
competition for conifer regeneration (Harrington, 2013). Also, the duff mitigates compressive
forces on the soil. Coarse woody debris, when occurring in forested areas, should be of sufficient
size and number to be consistent with the forest vegetation type. The extent and distribution of
coarse woody debris will vary both spatially and temporally and provide spatial heterogeneity
within forested stands. Anticipated new disturbance from ground based yarding averages about 9
percent of an activity area (Table 4). This is not all detrimental soil disturbance. Detrimental soil
conditions are calculated for the individual harvest units by harvest methods. The current level of
detrimental disturbance is 5 percent for the project area (Rust 2012). Since most of the existing
skid trails would be reused, newer equipment, and effective BMP’s and site specific mitigations,
new disturbance would generally overlap old disturbance adding only 1 percent cumulative
detrimental soil compaction. Disturbance from tractor harvesting in winter conditions would be
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 15
less due to logging on snow or frozen ground. No monitoring following winter harvest has
occurred on the Shasta Shasta-Trinity National Forest. However, monitoring in Region 1 on the
Lolo National Forest found winter harvesting created about 5 percent disturbance, but again this
new disturbance would overlap existing disturbance adding about 9 percent cumulative
disturbance to a particular unit but only 1 percent increase in detrimental soil disturbance.3
Detrimental soil disturbances from fuel treatments are estimated at an additional 1 percent for
mastication or underburning, 2 percent for mechanical brush piling and burning, negligible for
handpiling for each unit.
Erosion risk for all units is low due to the gentle slopes and high infiltration capacity of the ash-
derived soils (most soils are in hydrologic group B). Erosion is predicted to remain low in all
units and in all action alternatives due to soils that are very deep to deep, well drained and gentle
slopes. The erosion hazard rating model rated three soils at low-moderate after treatment due to
small portions of steeper slopes (appendix A). The steepest slopes possible in the units were used
in the model so this is the highest post treatment risk. Generally, proposed harvest is on slopes
from 0 to 15 percent, much gentler than modeled.
By implementing all resource protection measures (soil design features), BMPs, and standard
timber sale contract clauses, all units should meet Forest Plan soil quality standards. There
should be less than 15 percent of any unit in skid trails or other non-productive state, adequate
cover should minimize erosion, added slash and maintenance of the duff layer should maintain
soil biological process, soil fertility, and ultimately soil productivity.
Many of the proposed units are located on the rocky coarser-textured soils which would resist
compaction and impacts could be less than anticipated (Welke and Fryles 2005).
Resource Protection Measures 1.5.4
The following resource protection measures are included and should apply (all resource
protection measures can be found in chapter 2 of the EIS).
Table 6. Resource protection measures for soils
Soil
Number Resource Protection Measure Alternatives Units/Location
S-1
Reuse existing skid trails and landings where possible and dedicate no more than 15 percent of a harvest unit to primary skid trails and landings to limit the extent of skid trail and landing impacts. Till landings and main skid trails within 200 feet of landings with equipment such as a winged subsoiler or other tilling device to a maximum depth of 18 inches so that the soil is lifted vertically and fractured laterally to alleviate detrimental compaction (where it occurs) following completion of all management activities. Tillage will be completed outside of the tree drip line so as not to impact root systems.
1, 2, 3, 4a, 4b, 4c
Units 1,2,4-20,22,25-30,33-
38,40,41,43,45-52,54,56-
58,113,173,174,175,180-182,184-
189,192-200,223
3 Detrimental soil disturbance vs. soil disturbance is defined as “detrimental soil disturbance is when SQS threshold
levels are exceeded causing a reduction in soil productivity. Soil disturbance is when SQS threshold levels are not
exceeded and that does not cause a reduction in soil productivity”.
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 16
Soil
Number Resource Protection Measure Alternatives Units/Location
S-2
Implement best management practices (BMPs) and Forest soil quality standards for all activities. These BMPs will be used to prevent or mitigate project-associated effects related to soil erosion, compaction, and productivity. BMPs are found in Water Quality Management for Forest System Lands in California (USDA Forest Service 2000).
1, 2, 3, 4a, 4b, 4c
All units
S-3
Redistribute soil windrows in old plantations post-harvest to restore soil productivity. Plantation units 185 and 199 will be evaluated post-harvest to determine if windrow respreading is necessary.
1, 2, 3, 4a, 4b, 4c
Units 40, 185, 197 and 199.
S-4 Maintain ground cover (duff, leaves) across at least 50 percent of all activity areas to maintain soil productivity where available.
1, 2, 3, 4a, 4b, 4c
All units
S-5
Limiting the operating period (LOP) of timber sale activities: The objective of Practice S-5 is to ensure that the purchasers conduct their operations, including erosion control work and road maintenance, in a timely manner and within the timeframe specified in the timber sale contract. The extent of the wet weather and snowmelt season in Northern California can be very unpredictable, therefore a fixed Limited Operating Period for wet weather conditions will not be set for any of the proposed actions described in the EIS. Timber sale contract provision B6.6 can be used to close down operations because of wet weather, high water, or other considerations in order to protect resources. The spring snowmelt period (April-May) is the time when the potential for soil impacts are greatest. The sale administrator will be responsible for ensuring that timber harvest activities will not degrade the soil and water resource. .
1, 2, 3, 4a, 4b
Units 20, 21, 24, 27, 28, 32, 33, 35, 39, 42, 44, 45, 52, 53, 54, 55, 57, 58, 173, 180, 181, 185, 186, 192, 194, 196, 199, 200.
4c
Units 20, 21, 24, 27, 28, 32, 33, 35, 39, 42, 45, 52, 53-55, 57, 173, 180. 181, 185, 186, 192, 194, 196, 199
S-6
Conduct post-treatment FSDMP monitoring 1-3 years post-treatment to evaluate soil conditions including CWD.
All Representative units that include different soils and treatments.
Desired Condition for all units 1.5.5
Soil productivity is retained or improved in all treatment units.
At the end of project activities, a layer of ground cover should occur over at least 50 percent of
the activity area including duff, slash, and coarse woody debris.
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 17
Alternative 1 – Proposed Action 1.5.6
1.5.6.1 Direct Effects
Proposed activities would have short-term direct negative effects on forest soils. However, by
implementing the soil resource protection measures prescribed here and shown in chapter 2 of
the EIS the project would meet or exceed the Forest Plan soil quality standards as shown below,
and would therefore not have a significant impact to soils.
Effects include:
Compaction;
Rutting and displacement;
Soil-burn-severity;
Degraded litter layer and soil organic matter caused by increased decomposition rates and lack of
appropriate annual litter contributions;
Coarse woody debris. Proposed activities use techniques that maintain or promote natural soil
bio-physical resiliency. The effect of proposed activities should be relatively short compared to
techniques used in the past due to newer logging systems and resilient soils. By retaining natural
elements and processes we can expect soil impacts to be nearly undetectable within 10 to 20
years based on professional judgment and experience on these soil types. Freeze-thaw cycles,
soil organisms, and root growth will help alleviate compaction and rutting. Soil displacement
may last longer, but design features minimize soil displacement (Soil Design Features: S-1, S-2).
Units 181, 186, and 193 are near the threshold for detrimental disturbance with 8 to 12 percent
detrimental disturbance. Following Forest Plan standards and guidelines, BMPs, and project
resource protection measure (including subsoiling of landings and heavily used skid trails)
should reduce adverse effects and improve soil physical, chemical and biological properties.
(Soil Design Feature: S-2). Monitoring has found that when soils are dry4 to 8 inches,
detrimental compaction does not occur. Resource protection measures restricting operation
during wet weather have been effective according to monitoring results on the forest.
Units 42 and 200 have detrimental soil disturbance levels above 10 percent in existing landings
and skid trails. Those units with ashy soils are more easily rutted and compacted especially
during wet weather. Other ashy soils with more sand (e.g. Germany, Ledmount families) are less
susceptible to compaction (unit 42). The risk of exceeding standards is minimized by reusing
existing skid trails, operating during dry weather or frozen soil conditions, minimizing the sizes
of landings, and rehabilitating sections of skid trails and landings. A limited operating period,
when soils are dry to eight inches, has been effective at preventing detrimental compaction on
fine-textured soils (Rust 2009c). Reusing existing skid trails and minimizing size of landings
should keep the aerial extent of disturbance to a minimum, because a smaller impacted area
leaves more of the unit in an undisturbed state. Mechanical harvesting operations should only
increase compaction by 1 percent due to better operations, equipment, and soil resource
protection measures as show by the STNF Monitoring (Table 4 and Soil Design Feature: S-5).
4 Dry is defined as “when soils are dry (generally less than 18% soil moisture) enough to operate mechanical
equipment without causing detrimental soil impacts of erosion, compaction, puddling, or displacement.”
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 18
Units 40, 185, 197, and 199 are ponderosa pine plantations. When initially harvested, organic
matter and the top soil horizon were scraped into piles (windrows) on the edges of these units.
This organic matter and top soil horizon are crucial for soil productivity. The loss of organic
matter due to windrowing has a direct effect on site productivity and sustainability. In these
units, the soil piles would be redistributed throughout the unit to increase soil productivity and
increase the resiliency of these units. Windrow respreading has been used in several locations on
the STNF near the Harris Vegetation Management Project Area and has been found to be
effective (Van Susteren 2010 and Soil Design Feature: S-3).
Tractor piling brush in these units when soils are dry would not increase soil compaction due to
the degree, extent, distribution, and duration of the activity. The areal extent of tractor piling is
limited to slash concentrations and the equipment will operate over existing slash which reduces
the degree of impact to the forest floor. Some soil displacement may occur associated with
equipment operations but this too should be limited in extent due to flat topography and the
spatially patch distribution of activity generated slash. The fuel prescription requires
approximately four tons of slash in the unit (see fuels specialist report). The remaining slash will
provide for soil cover, erosion control, and provides a source of nutrient supply over time. The
five tons of slash is in addition to duff and smaller surface organics that would remain in the unit
(Soil Design Features: S-2, S-4).
Landings may range from 0.5 to 0.75 acre in size and will require approximately 70 landings for
this alternative. This equates to 35 to 53 acres in landings or 1.9% of the treatment acres in
landings. Approximately 1/3 of needed landings already exist. Landings that are on fine-textured
soils will be subsoiled to breakup compaction and return them to production. Other landings on
rocky soils do not compact to levels that are detrimental and will not be subsoiled (Rust, 2011).
The effects of fuel treatments on soils vary by method. Generally, hand methods have less of an
impact on soils than mechanical treatments (Table 7). Adverse effects from tractor piling to soil
fertility can occur if there is no mitigation; it is estimated to add two percent detrimental soil
disturbance as displacement to the activity unit (Young 2009). It is important to retain the duff
layer, slash and coarse woody debris in the units to maintain site productivity (Soil Design
Feature: S-2). The use of a brush rake or other techniques minimize soil disturbance by lifting or
rolling branches, etc., into piles while leaving finer organic materials to maintain adequate soil
cover (Roath 2006). Equipment operations would occur in units where it is necessary to meet
fuel loading requirements and only on those portions of a unit with excess logging slash
(typically 20 percent to 30 percent of a unit and only in certain units).
Prescribed Fire
Harvesting followed by prescribed burning will help to restore the natural role of fire to the
ecosystem. Burn plans that maintain approximately 50% soil cover will reduce potential for
erosion, and will provide for nutrient cycling. Needle cast is often observed post-fire treatment as
well as a vegetative response including grasses and herbaceous plants. In burned stands, there
could be up to 5 percent tree mortality and these trees would contribute to the coarse woody
debris of the stand.
Road Decommissioning
Decommissioning approximately 1.9 miles of roads would improve previously compacted road
beds by improving infiltration and restoring soil productivity through the addition of organic
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 19
material, and revegetation of bare areas. Rehabilitation through decompaction and/or
recontouring helps to restore the area to natural conditions, and initiates a long-term recovery
process. Anticipated results of road decommissioning include improvements in hydrologic
function that otherwise may be prolonged as soil compaction persists.
Road Maintenance
Proposed road maintenance includes improving road drainage, and site visibility. Treatments
may include rolling dips, culvert installation, outsloping, placement of aggregate base, and road
brushing to name a few. These actions disperse run-off and reduce erosion both on and off the
traveledway. Actions that improve road-side visibility reduce the risk of accidents.
Table 7. Fuel treatments and their qualitative effect on soils
Treatment Effects on Soil
Tractor Pile
. Topsoil is sometimes inadvertently mixed in with slash causing soil displacement. Keeping piles dirt-free and operating on residual slash minimize impacts. Use of a brush-rake reduces soil in piles.(2% detrimental disturbance as displacement)
Mastication
Fuel rearrangement, increased soil cover, temperature, moisture and microbe activity, possible short-term (less than 2 years) C/N imbalance if too much incorporation. The mulched material created by the masticator reduces the risk of soil compaction. (1% detrimental disturbance as displacement)
Jackpot pile
Treatment includes burning piles in the unit and at the landing. Concentrated areas of fuel consumed can be hot but are limited on the landscape, and do not increase overland erosion above natural rates. (Negligible detrimental soil disturbance)
Underburn
Treatment reduces surface slash and understory vegetation, generally at a low to moderated -intensity burn in a mosaic pattern across the landscape similar to what occurs in nature. This releases nutrients to the soil that are integral to plant growth. (Negligible detrimental soil disturbance)
1.5.6.2 Indirect Effects
There are several indirect effects associated with changes to soil physical properties including
reduced water infiltration rates, leading to increased overland flow and associated erosion and
sediment delivery to streams. Increased overland flow also increases intensity of spring flooding,
degrading the morphological integrity of streams, and contributing to low summer flows. Soil
compaction decreases gas exchange, which in turn degrades sub-surface biological activity and
above-ground forest vitality. Rutting and displacement cause the same indirect effects as
compaction and also channel water in an inappropriate fashion, increasing erosion potential. The
degree of soil burn severity can indirectly influence many forest elements and processes,
including changes in hydrology as described above, and decreased biologic activity. Loss of
organic matter decreases natural resiliency to disturbance, nutrient cycling and availability, soil
water and nutrient-holding capacity, and aggregate formation and all benefits associated with
aggregation. Forest soil is influenced in similar ways by both lack of coarse woody debris and
lack of organic matter.
Nutrients are lost during harvesting by removing the stored nutrients in trees, and if there is
significant reduction in the litter layer and woody debris are removed. Depending on the amount
of trees which are retained on site, whole-tree harvesting, as compared to conventional sawlog or
thinning operations, extracts larger amounts of biomass and nutrients, especially nutrient-rich
Harris Vegetation Management Soils Report
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foliage, from the site. The exact amount of nutrients lost from a particular site varies with forest
types and particular site conditions (Grier et al. 1989). The amount of nutrients present in the
trees also varies with stand age and development of the humus layer (Grier et al. 1989). Data
suggest that nutrient losses from whole-tree harvesting are considerably greater when compared
to conventional sawlog harvesting for all nutrients. Calcium losses are particularly large for
whole-tree harvesting due to the high concentrations of calcium present in the wood fiber of
twigs, branches, and boles (Adams 1998, Mann et al. 1988). Soil design feature S-6 is designed
to address situations where openings may be created to remove dead and dying trees (insect
infestation, root disease, etc.). Fuel treatments planned include machine pile & burn, mastication,
and prescribed burning. Maintaining fine slash (less than 3 inches) rich in nutrients on shallow to
sandy soils will buffer these units. Prescribed fire can increase available nitrogen for one to two
years following fire (Choromanska and DeLuca 2002). Burning slash piles can create high
temperatures in concentrated areas, leading to volatilization of nitrogen, and loss of phosphorus
and potassium (DeBano 1981). Burn plans that incorporate a burn mosaic throughtout the unit
ensure litter layers and organic matter are kept intact, nutrient losses are minimized from burning
slash and are localized. Nitrogen-fixing plants can colonize sites following fire and help restore
nitrogen in the ecosystem (Newland and DeLuca 2000, Jurgensen et al. 1997). Generally, if
plants colonize sites following fire, nutrient levels can reach pre-fire levels quickly (Certini
2005). Also charcoal deposited following fire also adds carbon to the soil (DeLuca and Aplet
2007). Monitoring of machine pile burns on the Pilgrim Project on the Shasta-McCloud
Management Unit indicated that there are little soil impacts from machine piling and burning
using small tractors with brush rakes. Generally soil burning only extended down to 2 inches in
hot burned areas and for the rest of the piles it was 1 inch or less. Soil displacement was minimal
along with soil compaction (Rust 2012).
Indirect effects of soil nutrient loss on forest vegetation include reduced growth and yield and
increased susceptibility to pathogens, such as root disease (Garrison and Moore 1998, Garrison-
Johnston 2003) and insect infestation (Garrison-Johnston et al. 2003 and 2004). Precipitation
(Stark 1979) and weathering of rocks would continue to make additional nutrients available on
site. Annual needle, leaf, and twig fall, forbs, and shrub mortality would continue to recycle
nutrients as well.
To prevent root disease, Sporax would be applied to cut stumps (RD-1), which should result in a
slight reduction in soil biotic activity in small areas. However, research has shown that it should
not contribute a significant amount of boron to the soil. Amounts applied to stumps are generally
small and are confined to a small area (USDA Forest Service 2006).
To summarize: maintaining soil organic matter in the upper 12 inches of soil on at least 85
percent of the site by limiting detrimental disturbance to 15 percent or less of the unit area should
not alter nutrient cycling and availability, and should maintain soil productivity. The project
design features prescribed above and shown in chapter 2 of the FEIS would meet or exceed
Forest Plan soil quality standards (the established standard for protecting soil resources) and
would not have a significant impact to soils.
1.5.6.3 Cumulative Effects
Cumulative effects include a discussion of the combined, incremental effects of human activities.
For activities to be considered cumulative their effects need to overlap in both time and space
Harris Vegetation Management Soils Report
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with those of the proposed actions. For the soil resource, the area for consideration is the unit
because effects on soils are site specific.
Fire and Fire Suppression
Active fire suppression has protected much of the Harris area over the past decades but has
resulted in increased fuel loading. The proposed harvest and subsequent treatments including
machine piling, mastication and under burning would improve overall forest health and
resilience. Treatments that reduce both current levels of infected dead and dying trees and
overstocked stands would help to reduce the risk of fire. Fuel model 9 accounts for a large part
of the project area and is characterized by closed canopy conifer stands with densely stocked
pole size trees in the understory. Typically, these stands contain pockets of dead and down
woody fuels. These fuels create high fire intensities during ground fires that can cause adverse
impacts to the soil resource. Fires with lower intensity and severity would reduce the potential
for excessive soil heating and sterilization as well as hydrophobic conditions that tend to increase
sediment movement, flooding, and possible slope instability (DeDios Benavides-Soloria and
McDonald 2005, Neary et al. 2005).The proposed risk reduction treatments will help restore.
Grazing
There are two vacant allotments that overlap with the Harris Vegetation Management Project
Area; the Toad Mountain allotment and the McCloud/Hambone Allotment.
Climate Change
The climate in Northern California is predicted to change in the near future. Increases in
temperature are likely and a change in precipitation is predicted as well but there is no clear trend
on precipitation changes (CEC 2006). What changes will actually occur and how these changes
will affect the soil resource are still unknown. Increased precipitation could lead to increased
erosion from rainfall (Nearing et al. 2004), but this is unlikely in the Harris Vegetation
Management Project area because of slopes and lack of water. Increased precipitation could also
lead to higher soil moisture levels and increased productivity (Nearing et al. 2004). Increased
temperature will increase soil respiration which will decrease carbon levels in the soil and
increase CO2 released into the atmosphere along with increased decomposition rate (Safford,
2011). Also predicted is a shift in species composition which could affect the soil resource (CEC
2006). Changes in species could affect litter and duff layers, nutrient cycling and soil
productivity.
There are insignificant cumulative effects to soils from global warming in the project area if soils
project design features are implemented.
Cumulative effects of Ongoing and Reasonably Foreseeable Activities: The following known
ongoing and foreseeable activities in the area would not overlap in space with the current
proposed activities and therefore would not have cumulative soil impacts.
Road maintenance
Firewood cutting
Mushroom picking
Dispersed recreation, including: driving for pleasure, snowmobiling, camping and hunting.
Fire suppression
Noxious weed control: monitoring of noxious weeds, prevention and control measures (hand
methods, no herbicides).
Harris Vegetation Management Soils Report
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Remaining underburning in portions of the Betty Davis units of Davis NEPA.
There are no private lands within the project boundary. All lands within the project boundary are
National Forest System lands.
Alternative 2 1.5.7
1.5.7.1 Direct Effects
Direct effects for alternative 2 would be similar to those of alternative 1, but alternative 2 treats
fewer total acres (2,617 acres versus 2,772 acres in alternative 1). This alternative would retain
more cover in the Harris Mountain LSR and would not have hazard reduction treatments
occurring in the LSR area. Retaining canopy cover in these areas would have less impact on
nutrient cycling and increase the soil resiliency of these sites to disturbance.
1.5.7.2 Indirect Effects
Indirect effects would be similar to those of alternative 1.
1.5.7.3 Cumulative Effects
This alternative would have the same cumulative effects in units outside of the LSR as
alternative 1.
Alternative 3 1.5.8
1.5.8.1 Direct Effects
The total acreage proposed for treatment in alternative 3 is less than alternative 1 (2,274 acres
versus 2,772 acres in alternative 1). Additionally no stands would be cut with less than 60
percent canopy cover, no hazard reduction treatments would occur, and no fuel reduction
activities would take place (machine pile and burn or mastication). No treatment would take
place in units 20, 21, 22, 26, 27, 33, 34, 54, 56, 180, 181, 189, 192, 194, 196, 197, 199 and 223;
therefore, no direct effects would occur in these units. Units 36, 41, 174, 183, 185, and 193
would only be underburned in this alternative and burning effects would be the only effects on
these units. Currently units 42 and 200 are over 15 percent detrimental soil disturbance.
Alternative 3 would have the least impact on soil productivity of all of the action alternatives.
1.5.8.2 Indirect Effects
Indirect effects would be less than those of alternative 1.
1.5.8.3 Cumulative Effects
Cumulative effects would be less than alternative 1 especially in the units listed above that would
not have treatment in this alternative.
Alternative 4a 1.5.9
1.5.9.1 Direct Effects
Direct effects would be similar to those in alternative 1 except that the units proposed for
masticated treatments only (Units 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, and 14) would also be
underburned to release remaining scatted timber. Mastication would increase the amount of
Harris Vegetation Management Soils Report
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woody debris left on the soil surface and some of the debris would be incorporated into the soil.
There would be a short term decrease in nutrient availability, slight increase in compaction, and
disturbance would increase where machines are driven.
Operating on dry soils where soils are fine-textured during mastication operations reduces the
risk of compacting the soils across all slopes. Monitoring (Rust 2009a) shows that even with high
soil moisture, compaction from low pressure mastication (less than 6 psi) was below the
threshold value on slopes up to 35 percent. When the soils were moist and slopes exceeded 35
percent then detrimental compaction occurred. No units in the Harris Vegetation Management
Project area have slopes greater than 35 percent. Burning at low severity will create a mosaic
pattern leaving patches of duff and release short-term nutrients. Mastication of brush will provide
additional cover along with litter-fall from scattered trees.
1.5.9.2 Indirect Effects
Indirect effects would be similar to those of alternative 1 and have marginal impacts.
1.5.9.3 Cumulative Effects
Cumulative effects would be similar to alternative 1 as well and little cumulative effects will be
realized by implementing the soil protection measures listed in Table 6.
Alternative 4b 1.5.10
1.5.10.1 Direct Effects
Direct effects would be similar to those in alternative 1 except that there will be increased under-
burning with this proposal and mastication and slightly fewer acres treated (e.g. due to
adjustments to protect sensitive resources) (2,719 acres versus 2,772 acres in alternative 1).
Prescribed fire has been an effective tool in restoring fire to the landscape and improving
vegetative cover. Use of existing roads and trails as fire controls lines will eliminate additional
soil disturbance from fire line construction. Several units proposed for acceleration of late
successional characteristics thinning will be changed to hazard and risk reduction treatments to
treat trees that show evidence of western gall rust, dwarf mistletoe, or evidence of bark beetle
attack (31, 174, 175, 183, and 189). To reduce potential adverse soil effects soil resource
protection measures (Table 6) will be incorporated.
1.5.10.2 Indirect Effects
Indirect effects would be similar to those of alternative 1 and have marginal impacts.
1.5.10.3 Cumulative Effects
Cumulative effects are greater than alternative 1 and effects will be off-set thru implementation
of the soil protection measures listed in Table 6 to insure SQS thresholds are not exceeded.
Alternative 4c 1.5.11
1.5.11.1 Direct Effects
Direct effects are less than those in alternative 4b because there were several units dropped with
this proposal due to being NSO foraging areas along with decreased mastication units (2,577
acres versus 2,719 in alternative 4b and 2,772 acres in alternative 1). This will decrease soil
disturbance and with soil resource protection measures (Table 6) soils will be adequately
Harris Vegetation Management Soils Report
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protected. With soil resource protection measures in place soil disturbance will be below SQS
thresholds.
1.5.11.2 Indirect Effects
Indirect effects would be similar to those of alternative 1 and have minimal impacts.
1.5.11.3 Cumulative Effects
Cumulative effects are greater than alternative 1 and effects will be set-off by aggressive
implementation the soil protection measures listed in Table 6 to insure SQS thresholds are not
exceeded.
Comparison of all alternatives (Table 8 below) shows differences in the alternatives for machine
pile & burn. Alternative 3 has no machine pile and only underburning will lessen soil impacts for
alternative 3. Mastication will be part of alternative 4a, 4b, and 4c vs. none for alternative 1, 2, or
3. This action will modify the fuel profile and will lessen soil impacts by providing a litter layer
and buffer for both equipment and soil erosion. Alternatives 4a, 4b, and 4c are similar for
machine pile & burn, mastication, and underburning. Alternative 5 will have no treatments of
thinning, windrow respreading, machine piling and burning, mastication or underburning.
Implementing the soil resource protection measures (Table 6) will insure SQS thresholds are not
exceeded and soil productivity is maintained for all alternatives. For all soil resource protection
measures alternatives will vary in the degree of disturbance, but in all cases soil quality standards
will not be exceeded.
Table 8. Comparison of alternatives
Alternative Forest Stand
Treatment (acres)
Machine Pile and
Burn (acres)
Underburn
(acres)
Mastication
(acres)
Alternative 1 2772 929 1269 0
Alternative 2 2617 798 1214 0
Alternative 3 2274 0 1334 0
Alternative 4a 2772 878 1214 1214
Alternative 4b 2719 863 1214 1418
Alternative 4c 2553 828 1214 1214
Alternative 5 0 0 0 0
Alternative 5 – No Action 1.5.12
1.5.12.1 Direct Effects and Indirect Effects
Under the no-action alternative, no commercial timber harvest or fuel reduction treatments
would be implemented to accomplish project goals. There would be no new disturbance resulting
from forest management activities, and existing disturbance would persist. No new addition of
detrimental compaction would occur and old skid trails would continue to recover at natural
rates. Freeze-thaw processes, weathering, and soil biota would work to slowly break up
compaction over time and vegetation would continue to re-establish on the existing infrastructure
of trails as their roots become able to penetrate growth-limiting layers of old compaction. No
new adverse effects would likely result from this action but in some locations productivity
potential in the short term may not be as high under this alternative as compared to the action
alternatives because historic disturbance would not be alleviated. Hydrologic function, such as
soil drainage, would be maintained at existing rates.
Harris Vegetation Management Soils Report
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Under the no-action alternative, the forest canopy would not be altered and organic material
covering the soil would not be disturbed by management. Soil cover standards would likely
continue to be met and the litter/duff layer would likely continue to thicken and increase in
continuity. Coarse woody debris levels would also likely continue to increase. As a result,
erosion hazards would likely remain low and soil nutrient cycles would be maintained.
Under the no-action alternative, the four units with windrowed soils would remain in its current
condition and no restoration of soil productivity would occur.
The probability of a high-severity fire within the project area during a given timeframe is
unpredictable. However, when a fire breaks out, the chances for high-severity fire effects on soils
can be much higher in untreated areas with excessively heavy fuel loads compared to those that
have been treated, including post-harvest logging slash (Certini 2005, Cram et al. 2006, Graham
et al. 2004, Gorman 2003, Keane et al. 2002).
Vegetation and fuel treatments would reduce the chance that a wildfire could have as severe an
effect on the soils and surrounding private property in treated areas as it could in untreated areas
because there would be fewer tons per acre of dead and dying fuels on treated sites.
A high-intensity wildfire would increase the potential for impacts to soils and soil productivity in
severely burned areas, especially since the risk of soil erosion increases proportionally with fire
intensity (Megahan 1990). Other effects would include the potential loss of organics, loss of
nutrients, and reduced water infiltration (Wells et al. 1979). Fires that create very high soil
surface temperatures, particularly when soil moisture content is low, almost completely destroy
soil microbial populations, woody debris, and the protective duff and litter layer over mineral
soil (Hungerford 1991, Neary et al. 2005). Nutrients stored in the organic layer (such as
potassium and nitrogen) can also be lost or reduced through volatilization and as fly ash
(DeBano 1991, Amaranthus et. al. 1989).
Fire-induced soil hydrophobicity is presumed to be a primary cause of the observed post-fire
increases in runoff and erosion from forested watersheds (Huffman et al. 2001). Though
hydrophobicity is a naturally occurring phenomenon that can be found on the mineral soil
surface, it is greatly amplified by increased burn severity (Doerr et al. 2000, Huffman et al. 2001,
Neary et al. 2005).
Soil hydrophobicity usually returns to pre-burn conditions in no more than six years (DeBano
1981). Dyrness (1976) and other studies have documented a much more rapid recovery of one to
three years (Huffman et al. 2001). The persistence of a hydrophobic layer depends on the
strength and extent of hydrophobic chemicals after burning and the many physical and biological
factors that can aid in breakdown (DeBano 1981). This variability means that post-fire impacts
on watershed conditions are difficult to predict and to quantify.
1.5.12.2 Cumulative Effects and Summary
Not treating the project area could result in unknown effects on productivity in the future in the
event of a wildfire. However, due to a lack of direct and indirect effects as a result of this
alternative, no cumulative effects are anticipated at this time. Because of the lack of adverse
effects, the forest is likely to continue meeting, or make progress toward Forest Plan standards.
By meeting soil quality standards, it is expected that desired conditions pertaining to the soil
resource would be achieved.
Harris Vegetation Management Soils Report
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1.6 SUMMARY
The desired soil condition is to maintain long term soil productivity. All of the alternatives will
meet Forest Land and Resource Management Plan standards for soil. Overall soil risk ratings for
the project area are low given the inherent soil physical, chemical, and biological properties.
Existing conditions indicate two units (42, 200) with high levels of disturbance. Soil resource
protection measures will help to reduce adverse impacts to soil physical, chemical and biological
properties that could be directly or indirectly affected. The degree of potential soil effects is
ameliorated through these resource protection measures. Comparison of the action alternatives
indicate alternative 3 would have the least impacts on soils based on acres treated and the
remaining alternatives will have the potential for more disturbance due to the duration and
distribution of disturbance.
To address the cumulative effects, a conservative approach was taken to maintain or reduce existing levels of disturbance. Reusing old skid trails, logging during winter conditions (snow or frozen ground) or on dry soils, and avoiding re-entry into areas of concern would avoid new detrimental disturbance and adverse cumulative effects. Reclamation would focus on major skid trails and landings, especially in units with high amounts of old harvest routes that have resulted in relatively high levels of compaction. Less-traveled trails would be excluded since they are not expected to have detrimental levels of compaction. Where compaction exists in both extent and duration, sub-soiling should effectively relieve most of the compaction. Recommended sub-soiling would be 18 inches deep and only occur on high traffic skid trails and on landings, where the great majority of detrimental compaction occurs. Visits to previously sub-soiled locations on the Forest revealed the importance of re-establishing vegetation on reclaimed sites in order to help recovery of the soil. Where skid trails would be sub-soiled there should be an adequate overstory that would encourage trees to seed in post-harvest. Where only low to moderate compaction exists, leaving soils intact is more desirable. The net effect is that the proposed management alternatives should not increase the degree of compaction such that soil productivity would be adversely affected.
Overall, the intensity of harvesting and fuel reduction activities would minimize any cumulative
effects on soil cover or nutrient cycling. The use of existing skid trails and landings minimizes
cumulative effects to these previously disturbed acres. As a result, cover and organic matter
standards would be met. Soil protection standards and natural processes should provide for
coarse woody debris within the project area. The dynamic and highly variable nature of soil
ecosystem processes and its strong buffering capacity minimize the risk of having measurable,
negative, or long-term cumulative effects on soil productivity.
The area has a high level of productivity and recovery potential. The indications are that the site
has a very high growth potential based on the field observations. The site potential, together with
other soil indicators being met, leads to the conclusion that the sites have a very high resiliency
to soil disturbance, low soil risk rating, and it is not expected that soil productivity would be
adversely affected.
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1.7 COMPLIANCE WITH THE FOREST PLAN AND OTHER REGULATORY DIRECTION
By implementing the soil resource protection measures, BMPs and any other mitigation
measures, the proposed activities will comply with the Forest Plan direction. Impacts to soil
productivity will stay below thresholds and will therefore meet NFMA.
See the regulatory compliance section (page 1) at the beginning of this report for more details.
Harris Vegetation Management Soils Report
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monitoring protocol: Volume 1: Rapid assessment. WO-GTR-82a. Washington D.C. U.S.
Department of Agriculture, Forest Service. 31 p.
Rust, Brad. 2008. Effects of tractor harvest on Shasta-Trinity soils. Personal communication.
Located in the project file
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 31
Rust, Brad. 2009a. Lakehead Mastication Project Soil Compaction Results. Internal monitoring
report.
Rust, Brad. 2009b. Personal communication (between Jacqueline Foss and Brad Rust) for
recovery rates of soils in Moosehead project area.
Rust, Brad. Past Shasta-Trinity Soil Disturbance Results, 2011.
Rust, Brad. 2012. Machine Piling & Burning Soil Monitoring Report. May 2012.
Rust, Brad. Shasta-Trinity National Forest Monitoring Results. 2003. Iron Canyon Late Seral
Reserve Study. Project File, pending publication by PSW Research Station after 5-year
follow up study.
Safford, Hugh, 2011. Shasta-Trinity National Forest Climate Change Expectations.
Stark, 1979. Nutrient losses from timber harvesting in a larch/Douglas fir forest. USDA Forest
Service Research Paper. INT-231.
USDA Forest Service, Shasta-Trinity NF. 2004. Monitoring and evaluation report. Internal
document.
USDA Forest Service. 2010. Forest Service Manual2550. Soil Management Handbook.
Washington D.C. 20p.
USDA Forest Service. 1995b. Land and Resource Management Plan, Shasta-Trinity National
Forests. Redding, CA
USDA Forest Service. 2008. Northern Region Soil Disturbance Monitoring Protocol. Draft
Report.
USDA NRCS. 2008. Soil Survey database for Intermountain Area, parts of Lassen, Modoc,
Shasta, and Siskiyou Counties, California. Ca604 survey area. Via
http://soildatamart.nrcs.usda.gov/
Vinton, M. A. and I. C. Burke. 1995. Interactions between individual plant species and soil
nutrient status in shortgrass-steppe. Ecology 76: 1116.
Welke, Sylvia and James Fyles.2005. When texture matters: compaction in boreal forest soils.
FSMN research note series
http://www.sfmnetwork.ca/docs/e/RN_en_Compaction%20and%20Texture.pdf
Wells, C.G and J.R. Jorgensen. 1979. Effects of Intensive Harvesting on Nutrient Supply and
Sustained Productivity. USDA Symposium Proceedings, 212-230. p 225-226
Wells, C.G., R.E. Campbell, L.F. DeBano, C.E. Lewis, R.L. Fredriksen, E.C. Franklin, R.C.
Froelich and D.H. Dunn. 1979. Effects of Fire on Soil: A State of the Knowledge Review.
USDA Forest Service Gen. Tech. Rep. WO-7. p.26.
Western Regional Climate Center. 2010. McCloud California weather and precipitation
summaries. Via http://www.wrcc.dri.edu/. Retrieved on 6/8/2010.
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 32
Young, David. 2009. Personal communication (between Jacqueline Foss and David Young) on
rates of disturbance for tractor harvest, located in project record.
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 33
2. APPENDIX A. EROSION HAZARD RATING CALCULATIONS
The Erosion Hazard Rating (EHR) was developed to assess the potential risk of a given soil to erode (R-5 FSH 2505.22). The EHR system is
designed to assess the relative risk of accelerated sheet and rill erosion. This rating system is based on soil texture, depth, clay percent, infiltration,
rock fragments, surface cover, slope, and climate. Risk ratings range from low to very high. Moderate ratings mean that accelerated erosion is likely
to occur in most years and water quality impacts may occur, mitigation may be applied in certain cases. High to very high EHR ratings mean that
accelerated erosion is likely to occur in most years and that erosion control measures should be evaluated. Bare soil refers to soil without cover,
current refers to current conditions before treatment, and treatment refers to soil cover after treatment.
Table 2. EHR for Harris Vegetation Management project area soils
Soil Texture Aggregate
Adjustment Erodibility
Climate Water
Movement Runoff
Uniform
Slope
Length
Runoff
Production
Runoff
Production
Rating
Slope
%
Runoff
Energy
Rating
Soil
Cover
%
Soil
Cover
Rating
Erosion
Hazard
Rating
Rating (1.8-2.2)
Germany
0 -10% slope bare
2 -1 1 3 1 0 6 10 3.33 10 0.1 0-10 5 1.7 Low
current 2 -1 1 3 1 0 6 10 3.33 10 0.1 (90-100)
1 0.3 Low
treatment 2 -1 1 3 1 0 6 10 3.33 10 0.1 (50-70)
2 0.7 Low
Ledmount
0-10% slope bare
2 -1 1 3 1 0 6 10 3.33 10 0.1 0-10 5 1.7 Low
current 2 -1 1 3 1 0 6 10 3.33 10 0.1 (90-100)
1 0.3 Low
treatment 2 -1 1 3 1 0 6 10 3.33 10 0.1 (50-70)
2 0.7 Low
Neer
20 - 40% slope bare
2 -1 1 3 1 0 6 10 3.33 40 0.3 0-10 5 5 Moderate
current 2 -1 1 3 1 0 6 10 3.33 40 0.3 (90-100)
1 1 Low
treatment 2 -1 1 3 1 0 6 10 3.33 40 0.3 (50-70)
2 2 Low
Ovall
0 - 5% slope bare
2 0 2 3 1 0 6 10 3.33 5 0.05 0-10 5 1.7 Low
current 2 0 2 3 1 0 6 10 3.33 5 0.05 (90-100)
1 0.3 Low
treatment 2 0 2 3 1 0 6 10 3.33 5 0.05 (50-70)
2 0.7 Low
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 34
Soil Texture Aggregate
Adjustment Erodibility
Climate Water
Movement Runoff
Uniform
Slope
Length
Runoff
Production
Runoff
Production
Rating
Slope
%
Runoff
Energy
Rating
Soil
Cover
%
Soil
Cover
Rating
Erosion
Hazard
Rating
Rating (1.8-2.2)
Revit
15 - 45% slope bare
2 0 2 3 1 0 6 10 3.33 45 0.45 0-10 5 15 High
current 2 0 2 3 1 0 6 10 3.33 45 0.45 (90-100)
1 3 Low
treatment 2 0 2 3 1 0 6 10 3.33 45 0.45 (50-70)
2 6 Moderate
Sheld
20 - 40% slope bare
2 -1 1 3 1 0 6 10 3.33 40 0.4 0-10 5 6.7 Moderate
current 2 -1 1 3 1 0 6 10 3.33 40 0.4 (90-100)
1 1.3 Low
treatment 2 -1 1 3 1 0 6 10 3.33 40 0.4 (50-70)
2 2.7 Low
Washougal
20 - 40% slope bare
2 -1 1 3 1 0 6 10 3.33 40 0.4 0-10 5 6.7 Moderate
current 2 -1 1 3 1 0 6 10 3.33 40 0.4 (90-100)
1 1.3 Low
treatment 2 -1 1 3 1 0 6 10 3.33 40 0.4 (50-70)
2 2.7 Low
Yallani
20 - 50% slope bare
2 0 2 3 1 0 6 10 3.33 50 0.5 0-10 5 16.7 High
current 2 0 2 3 1 0 6 10 3.33 50 0.5 (90-100)
1 3.3 Low
treatment 2 0 2 3 1 0 6 10 3.33 50 0.5 (50-70)
2 6.7 Moderate
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 35
3. APPENDIX B. CUMULATIVE EFFECTS TABLE
Table 3. Summary of soil effects by proposed treatment unit for the Harris Vegetation Management Project
Unit # Alt. Acres Timber Harvest
Method Yarding Method Fuel Treatment
Erosion
Rating % cover
Current
LWD
(T/Ac)
Current
Total
Disturbance
% of unit
in skid
trails
Projected
Additional
Disturbance-
dry season or
winter
Risk of
Exceeding R5
15%
Disturbance
Threshold
20 1,2,4 38 Mechanical Tractor, WTY Machine Pile and Burn Low 97% 7.7 13% 13% 3% High
21 1,2,4 46 Mechanical Tractor, WTY Low 97% 4.1 3% 8% 1% Low
22 1,2,4 51 Mechanical Tractor, WTY Machine Pile and Burn Low 94% 2.2 5% 7% 3% Low
23 1,2,3,4 70 Mechanical Tractor, WTY Low 98% 5.7 2% 7% 1% Low
24 1,2,3,4 121 Mechanical Tractor, WTY Low 90% 0.6 9% 7% 1% Low
25 1,2,3,4 34 Mechanical Tractor, WTY Low 94% 12.6 13% 17% 1% Moderate
26 1,2,4 17 Mechanical Tractor, WTY Low 95% 9.4 10% 10% 1% Low
27 1,2,4 14 Mechanical Tractor, WTY Machine Pile and Burn Low 93% 3.3 10% 13% 3% Moderate
28 1,2,3,4 49 Mechanical Tractor, WTY Low 88% 0.4 9% 8.50% 1% Low
29 1,2,3,4 16 Mechanical Tractor, WTY Low 75% 16.3 8% 10% 1% Low
31 1,2,3
55 Mechanical Tractor, WTY Underburn
Low 94% 2 5% 12% 2% Low
4 Masticate 2% Low
32 1,2,3,4 26 Mechanical Tractor, WTY Low 93% 3.4 8% 7% 1% Low
33 1,2,4 16 Mechanical Tractor, WTY Low 82% 0.7 3% 5% 1% Low
34 1,2,4 18 Mechanical Tractor, WTY Low 82% 17.2 5% 7% 1% Low
35 1,2,3
20 Mechanical Tractor, WTY Underburn
Low 84% 7.9 12% 13% 2% Moderate
4 masticate 2% Moderate
36 1,2,3
35 Mechanical Tractor, WTY Underburn
Low 73% 0.2 4% 5% 2% Low
4 Masticate 2% Low
37 1,2,3
54 Mechanical Tractor, WTY Underburn
Low 90% 1.2 5% 5% 2% Low
4 Masticate 2% Low
38 1,2,3,4 22 Mechanical Tractor, WTY Low 92% 0 7% 3% 1% Low
39 1,2,3,4 158 Mechanical Tractor, WTY Low 85% 0 13% 16% 1% Moderate
40 1,2,3,4 36 Mechanical Tractor, WTY Low 87% 0.5 22% 10% 1% High
41 1,2,3
78 Mechanical Tractor, WTY Underburn
Low 81% 0.6 2% 2% 2% Low
4 Masticate 2% Low
42 1,2,3,4 70 Mechanical Tractor, WTY Low 88% 0 25% 10% 1% High
43 1,2,3,
68 Mechanical Tractor, WTY Underburn
Low 89% 0.2 9% 9% 2% Moderate
4 Masticate 2% Low
44 1,2,3,4 7 Mechanical Tractor, WTY Low 87% 0.5 3% 2% 1% Low
52 1,2,3,4 58 Mechanical Tractor, WTY Machine Pile and Burn Low 96% 4.3 5% 7% 3% Low
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 36
Unit # Alt. Acres Timber Harvest
Method Yarding Method Fuel Treatment
Erosion
Rating % cover
Current
LWD
(T/Ac)
Current
Total
Disturbance
% of unit
in skid
trails
Projected
Additional
Disturbance-
dry season or
winter
Risk of
Exceeding R5
15%
Disturbance
Threshold
53 1,2,3
114 Mechanical Tractor, WTY Underburn
Low 85% 4.2 9% 8% 2% Moderate
4 Masticate 2% Low
54 1,2,4 19 Mechanical Winter Tractor, WTY
Machine Pile and Burn Low 82% 18.1 20% 20% 1% High
55 1,2,3
148 Mechanical Winter Tractor, WTY
Underburn Low 75% 4.6 18% 19%
1% Moderate
4 Masticate 1% Moderate
56 1,2,3,4 69 Mechanical Tractor, WTY Low 97% 14.1 3% 5% 1% Low
57 1,2,4 30 Mechanical Tractor, WTY Low 98% 3.1 8% 10% 1% Low
58 1,2,3,4 5 Mechanical Tractor, WTY Low 98% 3.4 3% 3% 1% Low
113 1,2,3,4 8 Mechanical Tractor, WTY Low NA NA 1% NA
173 1,4
24 Mechanical Winter Tractor, WTY
Machine Pile and Burn Low 93% 1.6 5% 12%
1% Low
3 1% Low
174 1,2,4
39 Mechanical Tractor, WTY Machine Pile and Burn
Low 92% 7.5 3% 3% 3% Low
3 Underburn 2% Low
175 1,2,3,4 97 Mechanical Tractor, WTY Low 90% 5.6 4% 6% 1% Low
180 1,4
40 Mechanical Winter Tractor, WTY
Machine Pile and Burn Low 95% 4.2 8% 15%
1% Moderate
2 1% Moderate
181 1,2,4 68 Mechanical Winter Tractor, WTY
Low 100% 0.8 15% 15% 1% High
183 1,2,4
21 Mechanical Tractor, WTY
Low 98% 43.2 5% 15% 1% Low
3 Underburn 2% Low
185 1,2,4
6 Mechanical Tractor, WTY
Low 95% 0 18% 6% 1% High
3 Underburn 1% High
186 1,2,3,4 41 Mechanical Winter Tractor, WTY
Low 87% 3 15% 7% 1% High
187 1,3,4 9 Mechanical Tractor, WTY Low 83% 5.2 17% 16% 1% High
189 1,2,4 34 Mechanical Tractor, WTY Low 92% 9.6 7% 17% 1% Low
192 1,4
27 Mechanical Tractor, WTY Machine Pile and Burn
Low 92% 11.1 10% 28% 3% Moderate
2 1% Moderate
193 1,4
57 Mechanical Tractor, WTY
Low 97% 5.2 10% 35% 1% Moderate
3 Underburn 1% Low
194 1,2,4 24 Mechanical Tractor, WTY Low 93% 0.7 2% 2% 1% Low
196 1,2,4 12 Mechanical Tractor, WTY Low 100% 2.5 3% 7% 1% Low
197 1,2,4 5 Mechanical Tractor, WTY Low 92% 1.9 7% 8% 1% Moderate
199 1,2,4 15 Mechanical Tractor, WTY Low 97% 0.7 15% 5% 1% High
Harris Vegetation Management Soils Report
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Unit # Alt. Acres Timber Harvest
Method Yarding Method Fuel Treatment
Erosion
Rating % cover
Current
LWD
(T/Ac)
Current
Total
Disturbance
% of unit
in skid
trails
Projected
Additional
Disturbance-
dry season or
winter
Risk of
Exceeding R5
15%
Disturbance
Threshold
200 1,2,3,4 12 Mechanical Winter Tractor, WTY
Low 92% 19.6 17% 22% 1% Exceeds
223 1,2,4 27 Mechanical Tractor, WTY Machine Pile and Burn Low 93% 97.3 5% 7% 3% Low
311 1,2,3,4 7 Mechanical Tractor, WTY Low 100% 0.6 0% 7% 1% Low
WTY = whole tree yard Prescribed burn units 1-14 were not formally surveyed, walk through surveys were completed. Unit 113 is a campground thin, no formal survey was performed because this is a special use area
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 38
4. APPENDIX C. SUMMARY OF FIELD WORK-CURRENT CONDITION
Table 4. TEAMS current conditions of Harris soils from field transect surveys of 2009
Unit # # Plots Down Woody
Debris (T/ac)
Average
litter/duff
depths (cm)
Bare
Soil Rock Vegetation Litter Wood
%
Cover
Total
Disturbance
(%)
20 60 7.7 6.3 13.33% 11.67% 15.00% 41.67% 18.33% 86.7% 13.3%
21 60 4.1 4.0 1.67% 6.67% 13.33% 61.67% 16.67% 98.3% 3.3%
22 60 2.2 2.0 5.00% 8.33% 15.00% 70.00% 1.67% 95.0% 5.0%
23 95 5.7 3.9 6.67% 5.56% 7.78% 74.44% 5.56% 93.3% 2.1%
24 90 0.6 4.8 5.56% 6.67% 2.22% 78.89% 6.67% 94.4% 8.9%
25 75 12.6 7.3 4.00% 0.00% 14.67% 60.00% 21.33% 96.0% 13.3%
26 60 9.4 3.6 8.33% 0.00% 6.67% 66.67% 18.33% 91.7% 10.0%
27 60 3.3 1.9 3.33% 1.67% 6.67% 71.67% 16.67% 96.7% 10.0%
28 70 0.4 2.3 11.43% 10.00% 32.86% 41.43% 4.29% 88.6% 8.6%
29 60 16.3 3.9 5.00% 3.33% 15.00% 61.67% 15.00% 95.0% 8.3%
31 60 2.0 1.5 8.33% 0.00% 23.33% 63.33% 5.00% 91.7% 5.0%
32 75 3.4 3.0 14.67% 1.33% 29.33% 46.67% 8.00% 85.3% 8.0%
33 60 0.7 2.0 6.67% 1.67% 33.33% 56.67% 1.67% 93.3% 3.3%
34 60 17.2 4.1 3.33% 0.00% 3.33% 81.67% 11.67% 96.7% 5.0%
35 60 7.9 2.0 8.33% 1.67% 6.67% 76.67% 6.67% 91.7% 11.7%
36 75 0.2 9.0 16.00% 6.67% 1.33% 70.67% 5.33% 84.0% 4.0%
37 60 1.2 2.4 8.33% 5.00% 16.67% 70.00% 0.00% 91.7% 5.0%
38 60 0.0 2.0 16.67% 13.33% 16.67% 53.33% 0.00% 83.3% 6.7%
39 90 0.0 1.6 17.78% 13.33% 5.56% 62.22% 1.11% 82.2% 13.3%
40 40 0.5 4.0 13.33% 0.00% 18.33% 68.33% 0.00% 86.7% 22.5%
41 90 0.6 2.8 17.78% 13.33% 7.78% 58.89% 2.22% 82.2% 2.2%
42 80 0.0 2.9 25.00% 8.75% 6.25% 57.50% 2.50% 75.0% 11.3%
43 75 0.2 3.5 26.67% 6.67% 5.33% 60.00% 1.33% 73.3% 9.3%
44 60 0.5 4.0 13.33% 0.00% 18.33% 68.33% 0.00% 86.7% 1.7%
52 60 4.3 2.3 8.33% 8.33% 11.67% 68.33% 3.33% 91.7% 5.0%
53 90 4.2 4.0 12.22% 7.78% 15.56% 57.78% 6.67% 87.8% 8.9%
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 39
Unit # # Plots Down Woody
Debris (T/ac)
Average
litter/duff
depths (cm)
Bare
Soil Rock Vegetation Litter Wood
%
Cover
Total
Disturbance
(%)
54 65 18.1 3.0 15.38% 1.54% 6.15% 67.69% 9.23% 84.6% 20.0%
55 90 4.6 2.4 18.89% 2.22% 28.89% 45.56% 4.44% 81.1% 17.8%
56 60 14.1 5.0 0.00% 1.67% 10.00% 73.33% 15.00% 100.0% 3.3%
57 60 3.1 1.0 6.67% 0.00% 18.33% 66.67% 8.33% 93.3% 8.3%
58 30 3.4 2.5 0.00% 0.00% 6.67% 86.67% 6.67% 100.0% 3.3%
173 60 1.6 8.0 3.33% 0.00% 1.67% 83.33% 11.67% 96.7% 5.0%
174 60 7.5 4.0 1.67% 3.33% 6.67% 85.00% 3.33% 98.3% 3.3%
175 90 5.6 2.8 6.67% 0.00% 12.22% 68.89% 12.22% 93.3% 4.4%
180 60 4.2 3.8 5.00% 1.67% 8.33% 68.33% 16.67% 95.0% 8.3%
181 60 0.8 5.0 10.00% 0.00% 16.67% 70.00% 3.33% 90.0% 15.0%
183 60 43.2 8.5 1.67% 5.00% 13.33% 63.33% 16.67% 98.3% 5.0%
185 53 0.0 2.0 18.52% 3.70% 12.96% 64.81% 0.00% 81.5% 17.5%
186 60 3.0 1.1 25.00% 0.00% 1.67% 73.33% 0.00% 75.0% 15.0%
187 60 5.2 4.7 6.00% 10.00% 0.00% 76.00% 8.00% 94.0% 16.7%
189 60 9.6 3.8 3.33% 3.33% 6.67% 85.00% 1.67% 96.7% 6.7%
192 60 11.1 3.7 5.00% 5.00% 11.67% 65.00% 13.33% 95.0% 10.0%
193 60 5.2 3.5 6.67% 1.67% 16.67% 71.67% 3.33% 93.3% 10.0%
194 60 0.7 2.0 5.00% 5.00% 33.33% 53.33% 3.33% 95.0% 1.7%
196 60 2.5 2.0 10.00% 3.33% 40.00% 41.67% 5.00% 90.0% 3.3%
197 60 1.9 2.3 11.67% 0.00% 5.00% 70.00% 13.33% 88.3% 6.7%
199 60 0.7 1.5 1.67% 1.67% 18.33% 78.33% 0.00% 98.3% 15.0%
200 60 19.6 4.0 10.00% 1.67% 8.33% 58.33% 21.67% 90.0% 16.7%
223 60 97.7 13.3 3.33% 0.00% 10.00% 36.67% 50.00% 96.7% 5.0%
311 30 0.6 5.3 0.00% 10.00% 13.33% 66.67% 10.00% 100.0% 0.0%
No soils data collected for units 1-14, prescribed burn units, these units were observed but no data was taken Unit 113 - Campground Thin-No Soils Data
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 40
5. APPENDIX D. SOIL DISTURBANCE MONITORING 2011 TRANSECTS
Harris Vegetation Management Soils Report
Shasta-Trinity National Forest 41
6. APPENDIX E. HARRIS WETLAND DETERMINATION