HomeMy WebLinkAboutEngineer's Design SpecsGnnTIELD CouNTY OWTS Reponr
Benrrlr RTSIDENCE, 631 CR 321, RIFLE
GnnnELD CouNTY, ColonADo
,. ',.; r;T,- ,',,..,,,
May 2023
Prepared by
SSGM
I8 WEST SIrrH STREtr, SU|TE 2OO
GleNwooo SPRTNGS, CO A l60 I
970.945. tOO4
970.945.5948 FÐ(
GnnTIELD Coururv OWTS RTPORT
Brnrre RrsrDENcE, 631 CR 321, RTFLE
Gnnr¡ELD Coururv, CoroRADo
"l hereby affirm that this Onsite Wastewater Treatment System (OWTS) report for the Beattie
Residence was prepared by me, or under my direct supervision, for the Owners thereof in
accordance with the provisions of Garfield County's OWTS Regulations and approved variances
and exceptions listed thereto. I understand the County does not and will not assume liability for
OWTS facilities designed by others."
Jefferey S. Simonson, PE
License No.
Licensed Professional Engineer, State of Colorado (Affix Seal)
PREPEREO BY:
JEFFEREY S. Sluol.lsol.¡, PE
SGM Proje ct # 2023-280.00 1
2
3
TneLe OT CONTENTS
1.0 lntroduction
2.O Preliminary lnvestigation
2.1 Property lnformation
2.2 Topography
2.3 Soil Data
2.4 Location of Physical Features
2.5 Additionallnformation
2.6 Landscape Position
2.7 Natural and Gultural Features
2.8 Gurrent and Historic Land Use
3.0 Detailed Soil lnvestigation
3.1 Visual Evaluation
3.2 Tactile Evaluation
4.O Recommendations
5.0 lnstallationObservations
6.0 Operation and Preventative Maintenance Schedule
7,0 Limitations
5
5
5
5
5
5
6
6
6
6
6
6
7
I
10
10
t0
4
l.0lntroduction
The subiect property at 631 County Road 321 in Rifle, Golorado is on a 10.0 acre parcel
located north of County Road 32'l on Taughenbaugh Mesa, south of Rifle. The proposed
OWTS is intended to provide onsite wastewater treatment to wastes from a single bedroom
unit being constructed as part of a storage building. The parcel for which this building is to
be constructed upon also has a main four room residence that is served by an OWTS. This
soil treatment area is 190' away from the proposed soil treatment area for this OWTS.
2.0 Prelim¡nary lnvestigation
2.1 Property lnformation
PhvsicalAddress: 631 CR 321, Rifle, Golorado
Leoal Description: S19, T6S, R93W, a parcel of land situated in the west half of the northwest
quarter, AJ(4, Lot 1 Brock Subdivision Exemption.
Existino Structures: Existing home and three out buildings
Domestic Water: Via an existing well that will be in excess of 160' away from the proposed soil
treatment area.
Sepfic;
2.2Topography
Topography in the vicinity of the new OWTS slopes from south to north at grades between 6 to
12 percent.
2.3 Soil Data
According to the Web Soil Survey for the Natural Resources Conservation Service (NRGS) soils
associated with the subject property are classified as map unit 56. NRCS soil unit 56 is Potts
loam, which has grades between 6 to 12 percent. This does agree with field observations.
NRCS soil data indicates Potts loam is acceptable for septic tank absorption fields due to the lack
of any restrictive layers within I' feet of the ground surface. This does agree with field
observations. Visual observation of the soils in the excavated test pits indicated the soils have
Clay loam characteristics.
Plotting the percentages of clay, sand and silt published by the NRCS for this soil unit on the
USDA Textural Triangle indicates the soils would classify as a Type 3A soil type. Soils having a
classification type 3A are suitable for absorption fields, having a long-term application rate (LTAR)
of 0.3 gallons per day per square foot of area (gpd/ft2).
2.4 Location of Physical Features
Physical features on the subject property that will require minimum horizontal setbacks are shown
in the following Table. All distances are in feet.
5
Potable Water
Supply Line
Structure with
Basement, Crawl
Space, Footing
Dra!nq
5
Property
Lines
Septic
Tank
10
5 0 10
20 10
2.5 Additional lnformation
a. Easemenfs; N/A
b. Floodolain Maps: N/A
2.6 Landscape Pos¡t¡on
The landscape pos¡tion for the STA is considered "side slope". The slope shape is sloping down
in the northward direction.
2.7 Naturaland Gultural Features: N/A
2.8 Current and Historic Land Use
The subject property is in the Garfield Gounty Rural Zone District and the use proposed is
cons¡stent with the County's Land Use Resolution. The property cunently serves a single family
home (ranch) with several out buildings.
3.0 Detailed Soil lnvestigation
A detailed soil investigation to determine the depth to the limiting layer, if any, and properly classiff
the soil type was conducted on May 30,2023. Visual evaluation of 2 soil profile test pits were
conducted in the field and samples collected from each test pit. The soil texture by feel method was
utilized in the field to classiff the soil type that will receive wastewater effluent.
Test pits were excavated adjacent to the proposed location for the STA installation, see the
accompanying drawing for the OWTS design to view Test Hole I and Test Hole 2 locations. Visual
evaluation of both test pits was conducted under adequate light conditions, with the soil being in an
unfrozen state.
3.1 Visual Evaluation
Two test pits were excavated by the Owner's contractor prior to SGM personnel being on site.
The test pits were labeled by SGM personnel as (TH-1 and TH-2).
Test pit (TH-1) exhibited silty clay soils with topsoil for the first 0 to 10 inches. From 10 inches to
40 inches the soils were brownish red and would be classified as silty clay with a minor percentage
of rock. Likewise, from 40" to 96" of depth, the soils remained to be a silty clay with caliche and
a small amount of basalt rock/boulders present.
Test pit (TH-2) exhibited topsoil with a root zone for the first 0 to 10 inches. From 10 inches to 34
inches the soils were brownish red and would be classified as silty clay with a minor percentage
of rock. Likewise, from 34" to 96" of depth, the soils remained to be a silty clay with caliche and
a small amount of basalt rocUboulders present.
Septic Tank
emueñt t¡ne
STA
6
Although rock was encountered in both test pits, by visual observation their percentages were
determined to be less than 5 percent.
Excavation was terminated at a depth of 8 feet for TH-1 and 8 feet for TH-2. Neither pit showed
signs of:
o A limiting layer.
o Presence of groundwater
Soil observation logs and photos can be found in the Appendix.
All measurements are from ground surface.
3.2 Tactile Evaluation
On the same date, SGM conducted the soil textural by feel evaluation on the soil samples
collected during the visual evaluation of the test pits. Results of the soil gradation revealed:
1. Total sample size = 1,000 ml; both samples
2. Volume of rock > 35 mm (3/4") = g
3. Volume of fock > 2 mm (0.079"¡ = 39
4. Percent rock in sample = 3
Soils are not type "R".
Performing the soil texture by feel methodology on the non-rock portion of the sample are shown
in the following table.
*Weak < 1 inch; Moderate 1-2 inches; Strong > 2 inches
Results shown in the above table indicate a USDA soil classification of silty clay, soil type 3 or
34.
To determine the proper soil type, the USDA soil structure type and grade were used. The
following Table shows the soil's USDA structure type and grade determined for the sample.
SAMPLE
USDA Soll
Structure
Tvpe
USDA Soll
Struc'ture
Grade
TH-1 Prismatic Moderate
TH.2 Prismatic Moderate
7
SAMPLE
Sample
Depth from
Ground
Surface (ftì
Does Soll
Form a Ball
(yes/no)
Does Soll
Form a
Rlbbon
fves/no)
*Type of Rlbbon
Formed (Weak,
Moderate,
Stronol
How Does the Soll Feel
(Grltty/SmoothlNelther)
TH.1 4 ves ves <2"Neither
TH-2 4 ves ves <2"Neither
According to Table 10-1, section 43.10 of Reg43, soil types 3 can have a prismatic structure
type, but only soil types 3-34 can have a moderate soil structure grade. As such, the soil to
ieceive the eifluent waste is classified as soil type 34. Soil type 3A has a LTAR of 0.3 gpdlft2 for
application of effluent treated to treatment level 1.
4.0 Recommendations
Per Table 6-1 of Reg43 the design flow rate will be 300 gpd (gallons per day).
(Per Reo 43. the minimum design requirement for new construction is 2 bedrooms or 300 qpd).
Construction of the proposed ISDS/OWTS is suitable for this site based on a design flow rate of 300
gpd. At a minimum, the new system shall have:
o A 750 gallon two chamber septic tank installed
¡ A distribution boxo A chambered trench distribution system consisting of Quick4 infiltrators.
o 4" diameter influent and effluent lines.
lnfluent from the residence will be conveyed through 4" diameter PVC lines, by gravity, to the
proposed septic tank inlet. The new 750 gallon septic tank shall be installed at least 5 feet away from
the proposed building. The pipe leaving the tank shall be 4' diameter PVC pipe and sloped atlr" per
foot to the distribution box. The distribution box shall be fitted with 4 Polylok (or equal) flow control
wiers for equal distribution of flow to each of the four chambered trenches. All effluent flow will be by
gravity and influent/effluent lines shall be installed per associated plans and details.
The OWTS STA site elevation is approximately 5,730 feet above sea level (NAVD 88) and it will be
focated east of the existing building (in excess of 160'away) and in excess of 25'north of the proposed
building. The proposed 750 gallon septic tank will be installed north of the proposed building by at
least 5 feet.. Both locations are shown on the attached Drawing (Sheet 1 of 1).
Sewer Pipe: Sewer influenUeffluent pipe shall be 4-inch solid wall SDR-35 PVC installed per plans,
¡ut rnay be adjusted in the field as field conditions wanant. The minimum grade for the piping shall
be 2o/o and the maximum grade 17%. Joints shall be solvent welded and cleanouts are required:
1) Within 5 feet of the existing/proposed structure.
2) At spacing not to exceed 100 feet.
3) Upslope of two or more bends closer than 10 feet.
All 90 degree bends shall be constructed using two, 45 degree fittings. The pipe shall be properly
bedded per the typical trench detail presented on sheet 3.
A minimum cover of 42-inches must be maintained over the influent and/or effluent piping. lf the
minimum covering cannot be met, insulation must be installed over the pipe per the detail on sheet 3
until the minimum cover over the pipe is met.
I
# Bedrooms Occupancy (# of
Persons)
Wastewater Flow per
Person Design Flow (gpd)
1 2 75 150
Seofic lanks: One new 750 gallon septic tank with two compartments will be required. The tank
must be on the Colorado Department of Public Health and Environment's accepted septic tank list
and/or meet the requirements of section 43.9 A and B, Reg43. The tank and lids shall conform to
current County OWTS regulations and be traffic rated. The tank shall be installed with insulated,
watertight access risers having lids that can be secured. Risers shall meet the tank manufacturer's
requirements for type and installation. There shall be an effluent filter and its handle shall extend to
within twelve inches of the lid.
The septic tank shall:
1) Be located down gradient of the proposed building.
2) Have a covering of no more than 4.0-feet and a minimum of 1.0-feet in depth, measured from
the top of the tank lid to finished grade surface. A septic tank having a cover thickness less
than 1.O-foot or greater than 4.0- feet will not be allowed.
3) Be at a location accessible for pumping and maintenance.
Prior to installation of the tank, the installer must ensure tank placement will allow connection of the
tank's inlet invert to the outlet of the existing tank, in addition to providing gravity flow to the new
distribution box.
Soit Treatment Area (STA.|: The soil treatment area was sized using criteria found in section 43.10
of Reg43 for a 2-bedroom residential home using:
¡ Trench absorption area of 700 square feet.
o Chambers in trenches for the distribution media associated with the proposed STA.
The following table summarizes sizing of the STA.
No.
Occupants
Daily
Design
Flow
(ood)
LTAR
Method of
Application
Adjustment Factor
Distribution Media
Adjustment
Factor
STA
Size
(sr)
2 oroposed 300 0.30 1.0 0.7 700
The total required absorption area for the STA to accommodate proposed improvements is 700
square feet.
The STA shall be excavated as field conditions require using the following guidelines.
1. Four chambered trenches having a total absorption area of 700 square feet.
2. Trenches shall be no wider than 3 feet.
3. Trench lengths shall be no greater than 100 feet.
4. A minimum of 6 feet, measured sidewallto sidewall, shall separate trenches.
5. The infiltrative surface shall be no greater than 4 feet from the surface.
6. Trench floors shall be level and set between 4 to 5 feet from the surface.
7. Chambers shall be placed per the manufacturer's directions.
Chambers shall have a minimum floor area of 90 percent of the excavated area, per Reg43
requirement 43. 1 3.8. 1 .d.
I
5.0 lnstallation Observations
Installation of the OWTS tank, effluent lines, distrlbution box and infiltrators shall be observed by the
design engineer or his/her representative. These features shall be set at final location/elevation and
ready for final backfill prior to SGM personnel showing up on site to conduct these inspections.
Scheduling shall occur at least three days in advance by calling 970-945-1004 and requesting to be
connected to the project manager for project 2023-280.
6.0 Operation and Preventative Maintenance Schedule
The goal of an operation and maintenance schedule is to observe the operation, and perform minor
maintenance to the onsite wastewater system to allow for proper, long-term functioning of the system.
Sepfic fanks; The scum and sludge accumulation in the septictanks shall be monitored yearly. Once
the cumulative scum or sludge thickness reaches 25o/o ol the tank depth, the entire tank shall be
pumped. A pumping frequency of 1 to 3 years is expected at design flows. An alternative is a regular
pumping frequency of every 2 years.
Effluent Filten The effluent filter at the septic tank discharge shall be cleaned (hosed off) at the time
of pumping or as needed.
General: System users must realize that an on-site wastewater treatment system is different from
public sewer service. There are daily considerations, such as not putting plastic or other non-
biodegradable material into the system. Water use shall be monitored so that toilets are not allowed
to leak when seals malfunction. Allowing fixtures to flow continuously to prevent water lines from
freezing is not acceptable. Although the proposed system æn accommodate variable flows,
spreading water use over several hours and eliminating peak flows is recommended. To illustrate
the point, a malfunctioning toilet can discharge in excess of 1,000 GPD. Excessive daily loading
could flood and irreparably harm the STA.
SGM recommends against installation of a water softener. The chemical and hydraulic loading from
the backwash of a water softener would be damaging to the STA, so if a softener is installed, a
separate drywell shall be constructed forthe backwash waste. No landscaping or plastic can be used
over the STA, which would reduce the performance of the STA. The design of the OWTS is based
on the treatment of domestic sewage only. Swimming pool or spa water is not to be discharged into
the OWTS. The proposed OWTS design is based on the regulatory flows noted in the attached
calculations. Increased flows may hydraulically or organically overload the OWTS, causing
premature failure.
7.0 Limitations
Our investigation, layout, design, and recommendations are based on site visits and the best
information available at the time. The contents of this letter shall not serve as the basis for any third
party engineering design. lf conditions that are considerably different from those described in this
report are encountered, SGM shall be called to evaluate the conditions. lf the proposed construction
is changed, SGM shall be notified to evaluate the effect of the changes on the OWTS prior to the
changes being made. All construction shall be in accordance with the Garfield County OWTS
Regulations. Pipe type and size, burial requirements, septic tank construction, and other
specifications, which are not depicted in our report, shall conform to the requirements of the County's
10
OWTS Regulations. The installer of the system shall be acceptable by the County's Environmental
Health Department.
11
Appendix
OWTS Plan Sht I
NRCS Soils Map
NRCS Absorption Field Soils Data
Textural Triangle
SGM Soil Observation Logs
SGM Soil Texture by Feel
OWTS Design Spreadsheet
12
M Gorfield County, Colorodo
Bættie Rsidenæ
ó31 CR 321, Rifle, CO
OWTS Design ond Detoils
1
INFILTRATOR SYSTÊMS INC.
QUICIG STA\IDARD CHAMBER
750 641. SEPNC TANK
(EtræWE
12
g'
POLYLOK PRODUCT ÐETAIL
QUICK4 STANDARD MULTIPORT END CAP
QUICK4 CHAMBER
TYPICAL INSTALUTION
DETAIL
(tþt b w)
:¡i'r*E
-,-,-
QUICK4 TRENCH DETAIL
8.0
Schemofc fo¡ Permil
ond Consiruclion
+T fl
tol I;t +
il
oI
fll
tJf,f,ffi
U
ô
USDA
-
United States
Department of
Agriculture
Natural
Resources
Conservation
Service
A product of the National
Cooperative Soil Survey,
a joint effort of the United
States Department of
Agriculture and other
Federal agencies, State
agencies including the
Agricultural Experiment
Stations, and local
participants
Gustom Soil Resource
Report for
Rifle Area, Golorado,
Parts of Garfield and
Mesa Gounties
NRCS
j
May 26,2023
Preface
Soil surveys contain information that affects land use planning in survey areas.
They highlight soil limitations that afiect various land uses and provide information
about the properties of the soils in the survey areas. Soil surveys are designed for
many different users, including farmers, ranchers, foresters, agronomists, urban
planners, community officials, engineers, developers, builders, and home buyers.
Also, conservationists, teachers, students, and specialists in recreation, waste
disposal, and pollution control can use the surveys to help them understand,
protect, or enhance the environment.
Various land use regulations of Federal, State, and local governments may impose
special restrictions on land use or land treatment. Soilsurveys identiff soil
properties that are used in making various land use or land treatment decisions.
The information is intended to help the land users identiff and reduce the effects of
soil limitations on various land uses. The landowner or user is responsible for
identitlng and complying with existing laws and regulations.
Although soil survey information can be used for general farm, local, and wider area
planning, onsite investigation is needed to supplement this information in some
Gases. Examples include soil quality assessments (http://www.nrcs.usda.gov/wps/
portal/nrcs/main/soils/health/) and certain conservation and engineering
applications. For more detailed information, contact your local USDA Service Center
(https://offices.sc.egov.usda.gov/locator/app?agency=nrcs) or your NRCS State Soil
Scientist (http://wwwnrcs.usda.gov/wps/portal/nrcs/detail/soils/contactus/?
cid=nrcs1 42p2_05395 1 ).
Great differences in soil properties can occur within short distances. Some soils are
seasonally wet or subject to flooding. Some are too unstable to be used as a
foundation for buildings or roads. Clayey or wet soils are poorly suited to use as
septic tank absorption fields. A high water table makes a soil poorly suited to
basements or underground installations.
The National Cooperative Soil Survey is a joint efiort of the United States
Department of Agriculture and other Federal agencies, State agencies including the
Agricultural Experiment Stations, and local agencies. The Natural Resources
Conservation Service (NRCS) has leadership for the Federal part of the National
Gooperative Soil Survey.
lnformation about soils is updated periodically. Updated information is available
through the NRGS Web Soil Survey, the site for ofücialsoil survey information.
The U.S. Department of Agriculture (USDA) prohibits discrimination in all its
programs and activities on the basis of race, color, national origin, age, disability,
and where applicable, sex, marital status, familialstatus, parentalstatus, religion,
sexual orientation, genetic information, political beliefs, reprisal, or because all or a
part of an individual's income is derived from any public assistance program. (Not
all prohibited bases apply to all programs.) Persons with disabilities who require
2
alternative means for communication of program information (Braille, large print,
audiotape, etc.) should contact USDA's TARGET Center at (2O2)720'2600 (voice
and TDD). To file a complaint of discrimination, write to USDA, Director, Office of
Civil Rights, 1400 lndependence Avenue, S.W., Washington, D.C.20250-9410 or
call (800) 795-3272 (voice) or (202)720-6382 (TDD). USDA is an equal opportunity
provider and employer.
3
Gontents
Preface..............
Soil Map............
2
5
6
7II
Soil Map (Beattie).....
Legend.........
Map Unit Legend (Beattie).....
Map Unit Descriptions (Beattie).....
Rifle Area, Colorado, Parts of Garfield and Mesa Counties
56-Potts loam, 6 to 12 percent slopes......
S8-Potts-lldefonso complex, 12 to 25 percent slopes.
Soil Information for All Uses.
SoilReports
Soil Physical Properties....
Physical Soil Properties (Beattie)
Engineering Properties (Beattie).....
11
11
12
...........14
...........14
,..........14
...........14
...........18
4
Soil Map
The soil map section includes the soil map for the defined area of interest, a list of
soil map units on the map and extent of each map unit, and cartographic symbols
displayed on the map. Also presented are various metadata about data used to
produce the map, and a description of each soil map unit.
5
ìtl
$
å
-
k
$
Þ
Custom Soil Resource Report
SoilMap (Beattie)
6ñEn 25ß/n ?5nin
3P Al4$N
E
Þ
E
Þ
E
Þ
g
R
Þ
Ë
g
3f Í4SN
E
E
I
Þ
o
Ë
25nÐ 6r2D ã'1,Ð
i4æScde: 1:1,3æ f Êfüd ql ApqfaÈ(8.Y x 11) *nrt
0 tl d)
o$1æmcD
t'þ pr{edon: vrteb l',ler@br comeroordæ: WGS84 EgFtlcs: ttft{ AE l:lN lit'lcs84
6
6nÐ 25Bl0 ?5nfit
]
þ
e
Ë
ì
ùr
s
åc)N
A
:F An3frN
ã't3{o
:I¡þ:Í39N
Custom Soil Resource Report
MAP LEGEND MAP INFORMATION
The soil surveys that comprise yourAOl were mapped at
1:24,000.
Please rely on the bar scale on eacù map she€t for map
measurements.
Source of Map: Natulal Resources Conservat¡on Service
Web Soil Survey URL:
Cood¡nate System: Web Melcator (EPSG:3857)
Maps from thE Web Soil Survey are based on the Web Mercator
proþc{ion, whicñ preserves direc'tion and shape but d¡storts
distance and area. A prcjectim that pr€sorv€s area, sucfi as the
Ab€rs equal-area conic projecfion, should be used if more
accurate calcr¡lations of distanca or area ars required.
This produc{ is generated from the USDA-NRCS certifed data as
of the version date(s) listed below
Scil Survey ¡¡sa: Rif,e Area, Colorado, Pa¡ts of Garfield and
Mesa Counties
SurveyArea Data: Version 15, Sep 6,2022
Soil map units are labeled (as space allows) for map scales
l:50,ü)0 or larger.
Date(s) aerial images were photographed: A.tg 25, 2021-Sep
5,2021
The orthophoto or other base map on which the soil lines were
com¡iled and digitized gobably difrers trom the background
Area of Intere¡t (AOl)
] Areaof lntercst(AO)
Soll¡¡
I So¡l Måp Unfr Pdygms
x, So¡l Map Unit Lines
I Soil MapUnitPoints
Spo.{al Polnt FeatuÞ!
t?¡ Blowout
ffi Borrow Pit
H ClaySpot
f,) Clc€d DoPr€ss¡on
;4 Gravd Pit
* Landfil
À LavaFlow
å Marsh orswåmp
æ MineorQuary
* Misca$an€ous Wator
æ Per€nnidwater
,rf Rod< OutcroP
+ saline Spd
:": sandySpot
€ Seversly Eroded SPot
--*. Sinkhol€
þ SlkteorSliP
É Sodicspot
ffi SpoilArea
I Stonyspd
d* VeryStonySpot
Tìu wet spot
,å Other
.- Special Line Features
ffierFoaturgr
N SbeamsandCanals
Tr¡n¡port¡tion
Rails
lntectatE Highwa)æ
US Routes
Major Roads
e
.-4¡:j: Local Roads
Bækgrcund
I A€rialPhoûography
7
Wãming: Soil Map may not be valid at this scale.
Enlargem€nt of maps b€yond the scale of mapping can cause
misunderstanding of the detail of mapping and acolrary of soil
line placement The maps do not shorv the small areas of
contrasting soils that could have been shown at a more detailod
scale.
Custom Soil Resource Report
MAP LEGEND MAP INFORMATION
imagery displayed on these maps. As a result, some minor
of unit boundaries be evident.
I
Custom Soil Resource Report
Map Unit Legend (Beattie)
Map Unit Descriptions (Beattie)
The map units delineated on the detailed soil maps in a soil survey represent the
soils or miscellaneous areas in the survey area. The map unit descriptions, along
with the maps, can be used to determine the composition and properties of a unit.
A map unit delineation on a soil map represents an area dominated by one or more
major kinds of soil or miscellaneous areas. A map unit is identified and named
according to the taxonomic classification of the dominant soils. Within a taxonomic
class there are precisely defined limits for the properties of the soils. On the
landscape, however, the soils are natural phenomena, and they have the
characteristic variability of all natural phenomena. Thus, the range of some
observed properties may extend beyond the limits defined for a taxonomic class.
Areas of soils of a single taxonomic class rarely, if ever, can be mapped without
including areas of other taxonomic classes. Consequently, every map unit is made
up of the soils or miscellaneous areas for which it is named and some minor
components that belong to taxonomic classes other than those of the major soils.
Most minor soils have properties similar to those of the dominant soil or soils in the
map unit, and thus they do not affect use and management. These are called
noncontrasting, or similar, components. They may or may not be mentioned in a
particular map unit description. Other minor components, however, have properties
and behavioral characteristics divergent enough to affect use or to require different
management. These are called contrasting, or dissimilar, components. They
generally are in small areas and could not be mapped separately because of the
scale used. Some small areas of strongly contrasting soils or miscellaneous areas
are identified by a special symbol on the maps. lf included in the database for a
given area, the contrasting minor components are identified in the map unit
descriptions along with some characteristics of each. A few areas of minor
components may not have been observed, and consequently they are not
mentioned in the descriptions, especially where the pattern was so complex that it
was impractical to make enough observations to identify all the soils and
miscellaneous areas on the landscape.
The presence of minor components in a map unit in no way diminishes the
usefulness or accuracy of the data. The objective of mapping is not to delineate
pure taxonomic classes but rather to separate the landscape into landforms or
landform segments that have similar use and management requirements. The
delineation of such segments on the map provides sufficient information for the
development of resource plans. lf intensive use of small areas is planned, however,
o
Map Unit Symbol ilap Unit Name Acres in AOI Percent ofAOl
56 Potts loam, 6 to 12 percent
slopes
5.5 74.5%
58 Potts-lldefonso complex, 12 to
25 percent slopes
't.9 25.5o/o
Totals for Area of lnterest 7.4 100.0%
Custom Soil Resource Report
onsite investigation is needed to define and locate the soils and miscellaneous
areas.
An identifying symbol precedes the map unit name in the map unit descriptions.
Each description includes general facts about the unit and gives important soil
properties and qualities.
Soils that have profiles that are almost alike make up a so/ series. Except for
differences in texture of the surface layer, all the soils of a series have major
horizons that are similar in composition, thickness, and arrangement.
Soils of one series can differ in texture of the surface laye¡ slope, stoniness,
salinity, degree of erosion, and other characteristics that affect their use. On the
basis of such differences, a soil series is divided into so/ phases. Most of the areas
shown on the detailed soil maps are phases of soil series. The name of a soil phase
commonly indicates a feature that affects use or management. For example, Alpha
silt loam, 0 to 2 percent slopes, is a phase of the Alpha series.
Some map units are made up of two or more major soils or miscellaneous areas.
These map units are complexes, associations, or undifferentiated groups.
A complex consists of two or more soils or miscellaneous areas in such an intricate
pattern or in such small areas that they cannot be shown separately on the maps.
The pattern and proportion of the soils or miscellaneous areas are somewhat similar
in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example.
An assocrafion is made up of two or more geographically associated soils or
miscellaneous areas that are shown as one unit on the maps. Because of present
or anticipated uses of the map units in the survey area, it was not considered
practical or necessary to map the soils or miscellaneous areas separately. The
pattern and relative proportion of the soils or miscellaneous areas are somewhat
similar. Alpha-Beta association, 0 to 2 percent slopes, is an example.
An undifferentiated group is made up of two or more soils or miscellaneous areas
that could be mapped individually but are mapped as one unit because similar
interpretations can be made for use and management. The pattern and proportion
of the soils or miscellaneous areas in a mapped area are not uniform. An area can
be made up of only one of the major soils or miscellaneous areas, or it can be made
up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example.
Some surueys include miscellaneous areas. Such areas have little or no soil
material and support llttle or no vegetation. Rock outcrop is an example.
10
Custom Soil Resource Report
Rifle Arean Golorado, Parts of Garfield and Mesa Counties
56-Potts loam, 6 to 12 percent slopes
Map Unit Setting
Nationalmap unit symbof jnys
Elevation: 5,000 to 7,000 feet
Farmland classification.' Farmland of statewide importance
Map Unit Gomposition
Potts and similar soils; 85 percent
Estimates are based on obseruations, descriptions, and fransecfs of the mapunit.
Description of Potts
Setting
Landform: Mesas, benches, valley sides
Down-slope shape: Convex, linear
Across-slop e shape: Convex, linear
Parent material: Alluvium derived from basalt and/or alluvium derived from
sandstone and shale
Typical profile
H1 -0to4inches: loam
H2 - 4 to 28 inches; clay loam
H3 - 28 to 60 inches; loam
Properties and qualities
S/ope: 6to 12 percent
Depth to restrictive feature: More than 80 inches
D rai n age c/ass.' Well drained
Runoff class; High
Capacity of the most limiting layer to transmit water (Ksat): Moderately high (0.20
to 0.60 in/hr)
Depth to water table: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum content: 15 percent
Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm)
Available water supply, 0 to 60 inches: High (about 10.3 inches)
lnterpretive groups
Land capability classification (irrigated): 4e
Land capability classification (nonirrigated): 4e
Hydrologic Soil Group: C
Ecologicalsde; R048AY306UT - Upland Loam (Wyoming Big Sagebrush)
Hydric soi/ rafing: No
't1
Custom Soil Resource Report
58-Potts-lldefonso complex, 12lo 25 percent slopes
Map Unit Setting
National map unit symbol: inyv
Elevation: 5,000 to 6,500 feet
Farmland classification: Not prime farmland
Map Unit Gomposition
Potts and simlar so/s; 60 percent
Ildefonso and similar so/s: 30 percent
Esûmafes are based on obseruations, descriptions, and fransecfs of the mapunit.
Description of Potts
Setting
Landform: Mesas, alluvialfans, valley sides
Down-slope shape: Convex, linear
Across-s/op e shape : Convex, linear
Parent material: Alluvium derived from basalt and/or alluvium derived from
sandstone and shale
Typicalprofile
H1 -0to4inches: loam
H2 - 4 to 28 inches: clay loam
H3 - 28 to 60 inches; loam
Properties and qualities
S/ope:12to25 percent
Depth to restrictive feature: More than 80 inches
Drainage c/ass.' Well drained
Runoff class: High
Capacity of the most limiting layer to transmit water (Ksat): Moderately high (0.20
to 0.60 in/hr)
Depth to water fable: More than 80 inches
Frequency of flooding: None
F req uency of pondrng.' None
Calcium carbonate, maximum content: 15 percent
Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm)
Available water supply,0 to 60 inches: High (about 10.3 inches)
lnterpretive groups
Land capabil ity cl assificati on (irrigated); None specified
Land capabil ity cl a ssifr cati on (noni rrigated) : 6e
Hydrologic Soil Group: C
EcologicalsÍe; R048AY306UT - Upland Loam (Wyoming Big Sagebrush)
Hydric sotT rafing: No
Description of lldefonso
Setting
Landform: Alluvial fans, valley sides, mesas
Down-slope shape: Convex
12
Custom Soil Resource Report
Across-slop e shape: Convex
Parent material: Alluvium derived from basalt and/or alluvíum derived from
sandstone and shale
Typicalprollle
H1 - 0 to I inches: stony loam
H2 - 8 to 60 inchesj very stonY loam
Properties and qualities
S/ope: 12 to 25 percent
Depth to restrictive feature: More than 80 inches
Drainage c/ass: Well drained
Runoff class; Low
Capacity of the most limiting layer to transmit water (Ksat); Moderately high to high
(0.60 to 6.00 in/hr)
Depth to water table: More than 80 inches
Frequency of floodtng: None
Frequency of pondrng; None
Calcium carbonate, maximum content: 35 percent
Maximum salinity: Nonsaline to slightly saline (0.0 to 4.0 mmhos/cm)
Available water supply, 0 to 60 inches: Low (about 5.1 inches)
lnterpretive groups
Land ca pability classifi cation (i rrigated): None specified
Land capabilîty classification (nonirrigated) : 6e
Hydrologic Soil Group: A
Ecologicalsffe; R034BY330UT - Upland Stony Loam (Pinyon-Utah Juniper)
Hydricsoilrafthg: No
13
Soil lnformation for All Uses
Soil Reports
The Soil Reports section includes various formatted tabular and narrative reports
(tables) containing data for each selected soil map unit and each component of
each unit. No aggregation of data has occurred as is done in reports in the Soil
Properties and Qualities and Suitabilities and Limitations sections.
The reports contain soil interpretive information as well as basic soil properties and
qualities. A description of each report (table) is included.
Soil Physical Properties
This folder contains a collection of tabular reports that present soil physical
properties. The reports (tables) include all selected map units and components for
each map unit. Soil physical properties are measured or inferred from direct
observations in the field or laboratory. Examples of soil physical properties include
percent clay, organic matter, saturated hydraulic conductivity, available water
capacity, and bulk density.
Physical Soil Properties (Beattie)
This table shows estimates of some physical characteristics and features that affect
soil behavior. These estimates are given for the layers of each soil in the survey
area. The estimates are based on field observations and on test data for these and
similar soils.
Depth to the upper and lower boundaries of each layer is indicated.
Particle size is the effective diameter of a soil particle as measured by
sedimentation, sieving, or micrometric methods. Particle sizes are expressed as
classes with specific effective diameter class limits. The broad classes are sand,
silt, and clay, ranging from the larger to the smaller.
Sand as a soil separate consists of mineral soil particles that are 0.05 millimeter to 2
millimeters in diameter. ln this table, the estimated sand content of each soil layer is
given as a percentage, by weight, of the soil material that is less than 2 millimeters
in diameter.
Siff as a soil separate consists of mineral soil particles that are 0.002 to 0.05
millimeter in diameter. ln this table, the estimated silt content of each soil layer is
14
Custom Soil Resource Report
given as a percentage, by weight, of the soil material that is less than 2 millimeters
in diameter.
Clay as a soil separate consists of mineral soil particles that are less than 0.002
millimeter in diameter. ln this table, the estimated clay content of each soil layer is
given as a percentage, by weight, of the soil material that is less than 2 millimeters
in diameter.
The content of sand, silt, and clay affects the physical behavior of a soil. Particle
size is important for engineering and agronomic interpretations, for determination of
soil hydrologic qualities, and for soil classification.
The amount and kind of clay affect the fertility and physical condition of the soil and
the ability of the soil to adsorb cations and to retain moisture. They influence shrink-
swell potential, saturated hydraulic conductivity (Ksat), plasticity, the ease of soil
dispersion, and other soil properties. The amount and kind of clay in a soil also
affect tillage and earthmoving operations.
Moist bulk density is the weight of soil (ovendry) per unit volume. Volume is
measured when the soil is at field moisture capacity, that is, the moisture content at
113- or 1110-bar (33kPa or lOkPa) moisture tension. Weight is determined after the
soil is dried at 105 degrees C. ln the table, the estimated moist bulk density of each
soil horizon is expressed in grams per cubic centimeter of soil material that is less
than 2 millimeters in diameter. Bulk density data are used to compute linear
extensibility, shrink-swell potential, available water capacity, total pore space, and
other soil properties. The moist bulk density of a soil indicates the pore space
available for water and roots. Depending on soil texture, a bulk density of more than
1.4 can restrict water storage and root penetration. Moist bulk density is influenced
by texture, kind of clay, content of organic matter, and soil structure.
Saturated hydraulic conductivity (Ksat) refers to the ease with which pores in a
saturated soil transmit water. The estimates in the table are expressed in terms of
micrometers per second. They are based on soil characteristics observed in the
field, particularly structure, porosity, and texture. Saturated hydraulic conductiviÇ
(Ksat) is considered in the design of soil drainage systems and septic tank
absorption fields.
Available water capacity refers to the quantity of water that the soil is capable of
storing for use by plants. The capacity for water storage is given in inches of water
per inch of soil for each soil layer. The capacity varies, depending on soil properties
that affect retention of water. The most important properties are the content of
organic matter, soil texture, bulk density, and soil structure. Available water capacity
is an important factor in the choice of plants or crops to be grown and in the design
and management of irrigation systems. Available water capacity is not an estimate
of the quantity of water actually available to plants at any given time.
Linear ertensibility refers to the change in length of an unconfined clod as moisture
content is decreased from a moist to a dry state. lt is an expression of the volume
change between the water content of the clod at 113'or 1/1O-bar tension (33kPa or
1OkPa tension) and oven dryness. The volume change is reported in the table as
percent change for the whole soil. The amount and type of clay minerals in the soil
infl uence volume change.
Linear extensibility is used to determine the shrink-swell potential of soils. The
shrink-swell potential is low if the soil has a linear extensibility of less than 3
percent; moderate if 3 to 6 percent; high if 6 to 9 percent; and very high if more than
9 percent. lf the linear extensibility is more than 3, shrinking and swelling can cause
15
Custom Soil Resource Report
damage to buildings, roads, and other structures and to plant roots. Special design
commonly is needed.
Organic matteris the plant and animal residue in the soil at various stages of
decomposition. ln this table, the estimated e¡ntent of organic matter is expressed
as a percentage, by weight, of the soil material that is less than 2 milllmeters in
diameter. The content of organic matter in a soil can be maintained by returning
crop residue to the soil.
Organic matter has a positive efiect on available water capacity, water infiltration,
soil organism activity, and tilth. lt is a source of nitrogen and other nutrients for
crops and soil organisms.
Erosion factors are shown in the table as the K factor (Kw and Kf) and the T factor.
Erosion factor K indicates the susceptibility of a soil to sheet and rill erosion by
water. Factor K is one of six factors used in the Universal Soil Loss Equation
(USLE) and the Revised Universal Soil Loss Equation (RUSLE) to predict the
average annual rate of soil loss by sheet and rill erosion in tons per acre per year.
The estimates are based primarily on percentage of silt, sand, and organic matter
and on soil structure and Ksat. Values of K range from 0.02 to 0.69. Other factors
being equal, the higher the value, the more susceptible the soil is to sheet and rill
erosion by water.
Erosion factor Kw indicates the erodibility of the whole soil. The estimates are
modified by the presence of rock ftagments.
Erosion factor KÍindicates the erodibility of the fine-earth fraction, or the material
less than 2 millimeters in size.
Erosion factor I is an estimate of the maximum averagê annual rate of soil erosion
by wind and/or water that can occur without afiecting crop productivity over a
sustained period. The rate is in tons per acre per year.
Wind erodibility groups are made up of soils that have similar properties afiecting
their susceptibility to wind erosion in cultivated areas. The soils assigned to group I
are the most susceptible to wind erosion, and those assigned to group I are the
least susceptible. The groups are described in the "National Soil Survey Handbook.'
Wind erodibility rndex is a numerical value indicating the susceptibility of soil to wind
erosion, or the tons per acre per year that can be expected to be lost to wind
erosion. There is a close correlation between wind erosion and the tefure of the
surface layer, the size and durability of surface clods, rock fragments, organic
matter, and a calcareous reaction. Soil moisture and frozen soil layers also
influence wind erosion.
Reference:
United States Department of Agriculture, Natural Resources Conservation Service.
National soil survey handbook, title 430-Vl. (http://soils. usda. gov)
l6
Custom Soil Resource Report
Three values are provided to identify the expected Low (L), Representative Value (R), and High (H).
lldefonso
Potts
58-Potts-
lldefonso
complex, 12
to 25 percent
slopes
Potts
56-Potts loam,
6to12
percent
slopes
Map symbol
and soil name
Physlcal Soll Properties-Rifle Area, Colorado, Parts of Garfleld and Mesa Counties
&60
&,8
28-60
4-28
04
28-60
4-28
0-4
ln
Depth
42-
42-
42-
-33-
44-
42-
-33-
44-
Pct
Sand
-38-
-38-
-38-
-36-
41-
-38-
-36-
41-
Pct
sitr
15-2ù25
1ï20-25
15-20- 25
27-3',t- 34
10-15- 20
15-20- 25
27-31- 34
10-15- 20
Pct
Clay
1.25-1.33-
't.40
1.25-1.33-
1.40
1.25-1.33-
1.40
1.25-1.33-
1.40
1.25-1.33-
1.40
1.2s-1.33-
1.40
1.25-1.33-
1.40
1.25-1.33-
1.40
g/cc
Moist
bulk
density
4.2T23.2842.3
4
4.23-23.2842.3
4
4.23-23.2842.3
4
1.41-2.824.23
4.23-23.2842.3
4
4.23-23.2842.3
4
1.41-2.824.23
4.23-23.2842.3
4
micro m/sec
Saturated
hydraulic
conduc-tivity
0.07-0.08-0.0I
0.10-0.12-0.1
3
0.14-0.16-0.1
7
0.17-0.19-0.2
0
0.14-0.16-0.1
7
0.14-0.16-0.1
7
0.17-0.19-0.2
0
0.14-0.1 6-0.1
7
Available
water
capacity
0.G. 1.5- 2.9
0.0- 1.5- 2.9
0.0- 1.5- 2.9
3.0- 4.5- 5.9
0.0- 1.5- 2.9
0.0- 1.5- 2.9
3.0- 4.5- 5.9
0.0- 1.5- 2.9
Pct
Linear
extensibility
0.s 0.8-
1.0
1.G.1.5-
2.0
0.0- 0.3-
0.5
0.5- 0.8-
1.0
1.0- 1.5-
2.0
0.0- 0.3-
0.5
0.s.0.8-
1.0
1.0- 1.5-
2.0
Pct
Organic
matter
10
17
.37
.32
.37
.37
.32
37
Kw
Eros¡on
faetors
.32
.32
.37
.32
.37
.37
.32
.37
Kf
5
5
5
T
5
5
5
YVind
erodibility
group
56
56
56
Wind
erodibility
index
17
Custom Soil Resource Report
Engineering Propert¡es (Beattie)
This table gives the engineering classifications and the range of engineering
properties for the layers of each soil in the survey area.
Hydrologic soit group is a group of soils having similar runoff potential under similar
storm and cover conditions. The criteria for determining Hydrologic soil group is
found in the National Engineering Handbook, Chapter 7 issued May 2007(http//
directives.sc.egov.usda.gov/OpenNonWebContent.aspx?contenl=17757.wba).
Listing HSGs by soil map unit component and not by soil series is a new concept for
the engineers. Past engineering references contained lists of HSGs by soil series.
Soil series are continually being defined and redefined, and the list of soil series
names changes so frequently as to make the task of maintaining a single national
list virtually impossible. Therefore, the criteria is now used to calculate the HSG
using the component soil properties and no such national series lists will be
maintained. All such references are obsolete and their use should be discontinued.
Soil properties that influence runoff potential are those that influence the minimum
rate of infiltration for a bare soil after prolonged wetting and when not frozen. These
properties are depth to a seasonal high water table, saturated hydraulic conductivity
after prolonged wetting, and depth to a layer with a very slow water transmission
rate. Changes in soil properties caused by land management or climate changes
also cause the hydrologic soil group to change. The influence of ground cover is
treated independently. There are four hydrologic soil groups, A, B, C, and D, and
three dual groups, A,/D, B/D, and C/D. ln the dual groups, the first letter is for
drained areas and the second letter is for undrained areas.
The four hydrologic soil groups are described in the following paragraphs:
Group A. Soils having a high infiltration rate (low runoff potential) when thoroughly
wet. These consist mainly of deep, well drained to excessively drained sands or
gravelly sands. These soils have a high rate of water transmission.
Group B. Soils having a moderate infiltration rate when thoroughly wet. These
consist chiefly of moderately deep or deep, moderately well drained or well drained
soils that have moderately fine texture to moderately coarse texture. These soils
have a moderate rate of water transmission'
Group G. Soils having a slow infiltration rate when thoroughly wet. These consist
chiefly of soils having a layer that impedes the downward movement of water or
soils of moderately fine texture or fine texture. These soils have a slow rate of water
transmission.
Group D. Soils having a very slow infiltration rate (high runoff potential) when
thoroughly wet. These consist chiefly of clays that have a high shrink-swell
potential, soils that have a high water table, soils that have a claypan or clay layer at
or near the surface, and soils that are shallow over nearly impervious material.
These soils have a very slow rate of water transmission.
Depth to the upper and lower boundaries of each layer is indicated.
Texture is given in the standard terms used by the U.S. Department of Agriculture.
These terms are defined according to percentages of sand, silt, and clay in the
fraction of the soil that is less than 2 millimeters in diameter. "Loam," for example, is
soil that is 7 to 27 percent clay,28 to 50 percent silt, and less than 52 percent sand.
lf the content of particles coarser than sand is 15 percent or more, an appropriate
modifier is added, for example, "gravelly."
18
Custom Soil Resource Report
Absence of an entry indicates that the data were not estimated. The asterisk'*' denotes the representative texture; other
possible textures follow the dash. The criteria for determining the hydrologic soil group for individual soil components is
found in the National Engineering Handbook, Chapter 7 issued May 2007(http://directives.sc.egov.usda.gov/
OpenNonWebContent.aspx?content=17757.wba). Three values are provided to identify the expected Low (L),
Representative Value (R), and High (H).
lldefonso
Potts
58-Potts-lldefonso
complex, 121o25
percent slopes
Potts
56-Potts loam, 6 to
I 2 percent slopes
Map unit symbol and
soil name
Englneerlng Properties-Rlfle Area, Golorado, Parts of Garfleld and Mesa Countles
30
60
85
Pc.t. of
map
unit
A
c
c
Hydrolo
g¡c
group
&60
0€
28-60
4-28
04
28-60
4-28
04
ln
Depth
V€ry stony loam
Stony loam
Loam
Clay loam
Loam
Loam
Clay loam
Loam
USDA texture
GC-GM,
SGSM,
GM, SM
CL-ML,
CL
CL-ML,
CL
CL
CL-ML,
CL
CL-ML,
CL
CL
CL-ML,
CL
Unifted
Glassification
A-2,A4
4.4
A-4
A-6
A-4
A-4
A-6
A4
AASHTO
2Ut
70
s&10
0-0-0
0-0-0
0-0-0
0-0-0
0-0-0
0-0-0
L.R-H
>10
inches
Pc't Fragments
G2$ 50
10-15-
20
0-0-0
0-0-0
0-0-0
0-0-0
0-0-0
0-0-0
L-R-H
3-10
inches
4$6&
90
7SgS.
95
1 00-1 00
-1 00
I 00-1 00
-100
1 00-1 00
-l 00
100-100
-100
I 00-t 00
-1 00
100-100
-100
L.R.H
4
Percentage passing sieve number-
4G6&
85
70-80-
90
1 00-1 00
-1 00
1 00-1 00
-1 00
100-100
-100
1 00-l 00
-1 00
1 00-1 00
-100
100-100
-1 00
L-R-H
l0
3S,5&
80
60s8-
75
85-90-
95
90-95-1
00
85-90-
95
85-90-
95
90-95-1
00
85-90-
95
L-R.H
40
2ï4+
65
50-58-
65
60-68-
75
70-75-
80
60-68-
75
60-68-
75
70-75-
80
60-68-
75
L-R-H
200
20-25
-30
25-28
-30
25-28
-30
30-35
40
25-28
-30
25-28
-30
30-35
40
25-28
-30
L-R-tí
Liquid
limit
NP-5
-10
æ-10
5-8 -1 0
10-15-2
0
5-8 -1 0
s8 -10
10-15-2
0
5-8 -10
L-R-H
Plasticit
y index
20
Soil Texture by Feel
Place soil in palm of hand, Add water drop-wise
and knead the soil into a smooth and plastic
consistency, like moist
putty.
Place ball of soil between thumb and forefinger,
gently pushing the soil between with the thumb,
squeezing it upward into a ribbon. Form a ribbon
of uniform thickness and width, Allow
ribbon to emerge and extend
over the forefinge¡
breaking from
its own
weight.
t
Add water Add dry soil
ls the soiltoo dry?
No
ls the soil too wet?
Yes
No
Does the soil remain in a ballwhen squeezed?
Yes No
Does the soilform a ribbon?
No
Yes
What kind of ribbon does it form?
Does soilfeel very gritty? Yes
No
Does soilfeelvery smooth? Yes
No
Neither gritty nor smooth? Yes
Forms a1-2"
ribbon before
breaking
Clay Loam
Soll ïype 3 or 3A
Sandyflay
Slltt'Chy
Lo¡m
dayle¡¡¡
loam
Forms a
ribbon 2"or
longer before
breaking
ffi
Forms a weak
ribbon less
than l " before
breaking
Loam
Soil Type 2 or 2A
Sandy Loam
Silt loam
loam
a pinch of soil in
palm and rub with
forefinger.
y wet
I
8¡sed on U50A NRCS 6uidetoTexturc by feel - 5.J.Thien, 1979, modified.
Ihisvôr¡ali0n (reat€d by D Hanison, M Brown,W Brown, R [aws.lf platy structuro than soil type 5
BASED ON REGUI.ATION 43 TABLE 1O-1
For Soils with Less Than 35 Percent Rock Fragments. Rock Fragments are larger than 2 millimeters.
Soil Treatment Area long Term Acceptance Rates by Soil Texture, Soll Structure, Percolation Retes and Treatment level
Long-term Acceptance Rate (ITAR)
Gallons per day per square footSoil Type, Texture, Structure and Percolat¡on Rate Range
Trcetmcnt
lcvct 1r
Trcatmcnt
lcvcl 2r t¡v¿l 2llr
Trutmcnt
]¡vcl 3r
ffartment
lrvrl 3Nti
Trc.tm.nt
USDA Soll Tcxtur.
USDAsoll
Structurc-
Twc
USDA Soll
Structurê4radc Rate (MPll
Pcrcolatlon
Soil Type
L6-25 0.60 1.OO 1.00 1.10 1.10
Sandy Loam
Loam
Sllt Loam
Prlsmatlc
Blocky
Granular
Moderate
StronB
Prlsmatlc
Blocþ
Granular
Weak
0.80 0.90 0.90
Sandy Loam
Loam
Sllt Loam
Masslve Structureless
2640 0.s0 0.80
0.55 0.65 0.65
Weak
Moderate
Strong
Prlsmatlc
Blocky
Granular
Prlsmatlc
Blocky
6ranular
41-50
6L-75
0.35 0.55
0.30 0.45 0.55 0.55
Sândy Clay loam
Clay Loam
Sllty Clay loam
Sandy Clay toam
clay Loem
Sllty clay l-oam
Masslve Structurèless
12!+0.10 0.rt 0.1¡0.ll 0.t'$E SollIVpc¡ 2*{A Plrüi
wçtl(
Modantc
Stroirl
2
2A
3
3A
Treatment levels are defined in 6.3
I lAreas outside the dashed box require design by a professional engineer
I ({.1
lÐ
9il
¿t)
8il
ll]
ts
T l']
5ri
¡lhrlr¡r ,o
tül lt!Ê t{r },1
.#
Textural
Triangle
éf
tìil
úl'l
¡il
Itl
"9(' Jt'r ì $
Sondylorm tlltLo¡m
I Èûr
l0
.l ll
¡)1 li f¡ll :/l {tr
, Percolrt S¡nd<--.
:0t¡
#SGM
sofl PRoËlt E TEST PtT tO6 ,
{A SEPAR#TE}qç SFIATI B.FJO ryB.I.ËT.q,q FOS SACFI SCIl*. ?EqFLF TEST.PI$
Property L*t b,^Rc'a.rt gzt E,&þ
Datecf tosgrnst .6f fuêrf tã---.Test Pit N
f
Range of Þepth of $oil
Itorilon, Relatlue tc Ground
Surface
USÞA $oll?extwe
USÐA SoiI
Sbucture-
Type
$ollS$ucture-
Grade
SollType
{Table 10 or "R"
Solls lnTable
31!
(¡ ffi rfJ"-Tæf56 t "
lb+&<+,øZlt;-,¿1a uís¿¿,+su ufø
,d3{" Tt} /r3 t'*¿*r.'< r+lþsd.4.Fgr s&-tfi d-d¡-s#.té-¡ffß a¿ /*
úa't 7zå 46 ',*lÅ-1 tnhu. uJ /fæ. *w+rt¿-Atçfiç€lkr.'r Åt /*"*
tNTþ^&,u1<-Ø
frqgr¡z-q* #\¡¿l¡-ç
Redoximorphic
FÊatures
Freseæt? {Ylil}
&j
..t-J
Nates:Nüè èa,áç-"Hþå W Æ,ÐdI
ls there a limiting layeras defhed ln ftegulation 0-1?? ü Yes É*o
lf yes, deslgn document must explaln how the llmitingcondition is addressed.
ls Dawson Arksse {DA} or Cemenred s¡rrd tcs} present? tl yes d*o
lf yes, please answer the fotlcwing:
ts materlat fracrured and/priointed? Ël yes M no
What ls the cementation class?
ls the Þawson Arkose or Cenented Sand lirniting layerpersectlon 8.T8.2 of 0-17? il yes Ht¡o
Soit Ohservatíon l-og ffiffiffiþ4
o**'çluLegal Ðescrþtion/GP$:Ê4Fr*{Å
,4ddressCtïe
Lacüstrìne(î.Af[¡{¡Cm; loess orgrnic lúatter ÐedrockOutwashSoil Farent MaterÎal(*!; Till
{circle allthat
:SurnmitLandscape bay¿ryy*¡fSlapeFoot Slope Toe Slope
Vegetãt¡on: W
Weather conditions/Ti¡ne of
Soil Suruey lVtap lJnÍt{sl: F"zfT+ Lë,4"1\
Obsen¡ation #/locatìon/Method :ÕFfleuation: ç?
¿Õ,/.
Depttr {ín}Tøcture Rock M¿trlx Mottle Redox $tructure Str¡rcture Consistence
Gr¡de,6
Fim
Looië
trieble
3q!F;
ExtÈmely
RIBîd
Lôıge
íF;iâhiä"')-'-aa=-
F¡rrn
ERrernêIyF¡ía
çlgld
loûse
FrleÞle
€kÞ
ÊÉreüêh F¡rÉ1
RlSld
Llose
Frlabl€
mfin
E,(ltÊñelYFIf n
nbH
[tarÊ
frið¡{e
Fkrt
€ttre.tnely ¡irfi
R¡grd
Locse
Êrhble
t¡tÊì
Ertr€rnefy Íirírr
ß¡gÌd
weâk/6iæ*sröiü"--
LOQsi
wea&
ñffir;;-
Strong
LôO3ê
Loôse
Slrong
4eâk'l
ù10dÊrêle
We¡k
ModÊretq
Strong
Lóósé
W€5k
Moderðte
Stroû€
Loose
We¿k
Moder'tte
9trong
lûcsÊ
Målfþà
Sirr8leGr¿iír
'ÉÊà*.l#"th
€Ëfirlåt
Pl¡19
6råilul¿r
ptrlv
8lèrke
d*in;t¿'
Slrçl*êafn
tilatr¡YÈ
-Fh*r.
"S$.qìitlÊslf!É¡eGr¡in
lr¡l¡cþ¿
Gl:øJ:r
PlrtT
Ftàcf
6rðncllr
È¡aúr
9drù¡aí(
ti¡n$t6ılÊ
l,dthr-
Gl¡rolàt
Pt¡tT
Blocly
Frll¡¡rtic
SìrÉls çr¡ln
M¡lclve
Gr¡riulåf
PÌ¡tY
9l0CIçy
Þrf'rñatir
SkryhGretn
¡¡Tlsitt
Concentfations
Depletìons
Gleyed
Concentrations
Depl¿tions
Gleyed
Csn€entrations
Depletions
Gleyed
Csncenþations
Depletions
Gleyed
Concentr¡tions
Ðepletions
€leyed
Coneeritrêt¡ofls
DeFfêt¡ons
6leyed
/v/4
il,/*
,r/"
fua*g',
î6úh/tu
'k*.+p,,¡
/,*æa
*r+æ**&,
Ye
*Á
¿,
54'
TÐfúpt t^.
fþne,Jui'#tgÉþ '
átffi,¡ e{Ffi<
,ü*u'"q¿¡"sa æ,#*p
.¿itfuü{É Æ_L
/î),./o {æú{*
t*/t"
r),-4ou
4ü':#ør
(¡rnments:
llÍr€rÉe#l lthtel .l$l¡n*tr¡ÊÊ)
Cen¡fied St¿tsnenÈ I hereby certify that I hãve coûnÞleted fü¡s
r,rrorft ín acordance wîth alleBpfícablç ordlnarces, rules aad laws.
gSGM t
$oll Prañlc Tüt P[t Gnphlc to¡ l{umbut Þ
0 t 76342
urptlt til Err
3
tomdt¡thc¡
4
1
2
3
EI¡It
3
Ë
Ë ¡
6
7
t
I
t ¡
-l¡na
t t-!
t
-
J I
rl
L
I
tl ¡
a
.t
a l-¡I r t
¡
û¡L )a,)¡,
7!l a /t
DI 7,t,/I I ll¡rt¡/
¡-U .7
/¡ln?tt t 'll,FI
7 !
I /a I-
Z¡/À
.l !I I 7f
J ,
,
1,
Ir IIIII,1 D IIIIIIIII-IIIIIII-IIIT'IItlII
IIIIIIIIIIII
IIIrttIIJ
II
h'[],] 1lI IIIIIIIIII IIIIjIII,a ¡¡l 7 ,)l rL 7 rtIIIIII
IIII
ItI 7
III
tt IIIIIIII
II IIIIII
II
IIIIIII=IIIT
-I-TIIIIIIII IIIII
IIIII
,:,
a IIIIt
t rr ;/a
7 tI \/ItII
>'''-rlltrIII (42 7t--trTIIIITIIIt.r¡)//IIltIIIIIII
IIIIIIII
I )-/f 1 [ a'"./
II trIIIIITIIITIIIIiIT
IITIIIII IIrttrItrIIIIIIIIIIIIIIIIII TIIIIIIIIIIIIIIIIIII
gsG!\4
sotl pñ$HbË TE$T FIT 106 j
fA SEFAßÅTE soq_qHårL BE coMp[Ë.lFp FoR".E*cH sotf. p-Bs-"EtrË rFgr qry]
Propefi
Test Fit Number:
4æ Ðate of
USDA. SollTexture
*an6e of üeptfi af $olt
*lcrllotr, BeletÍve tc Ground
Surface
U3ÐA Sotl
$trueture -
TyPe
gollStruBþre-
Grade
SollType
lTable 10 or "R"
$oìls lnTable
111
Ð * lt!'"Fpf¿p.¿ /Ff^¿ {"9*4f,q.#¿:Å_"Èrg çfø.
/rgtí* f¡,+rt ëÊt*¿,+of¿*xxsa/Ë ,*¿1'r$.
Ëdil * 4*4 .3*{,çt ¿-<Wç< uti 1'H"/-S/å'4,y'ç'{¿¡.#g+¡¿
,^¿ /#.-
{.**ças*". "&. d*ø,t;
itþåx,a¿ .Ñ11
ffrga¿r-Á.Ì^#'"o
*edoximorphlc
Fe¡tures
Present? (YlNl
/#
-{y'
Notes¡,<)æ *oo*.o-no,r'-f*
ls there a llmiting layer as deflned in Regulatio nt-17? E Yes W *o
lf yes, design document must expfaln how the lîmitinE condltion is addres*ed.
ls Þawson Arkose (DA) or Cemented $and {cs} present? ü yes ffUo
lf yes, please answerthe following:
ls materialfractured and/orlolnted? tl yes d¡¡o
What is the cementation class?
ls the Dawson Arko¡eorCemented Sand llmitlng layerpersectlon 8.78.2 of 0-17? fl yes $ttIt
I
I
So[[ Obsenpatlogr Log ffiffiffiiþ4
ç /çni *oLegal Desc rtption/GP$:êqF*&Client/ Addres+:CIate;
frt*-{b"p\ 6.rr:
Loess organÍe Matter B*drockOuftvash LacustrineSçil Parent Material(s): Tlll
rcle all that
# Núi71r'"47" '
lce SlopePosition:Foot
Vegetarion: çff¿tw*
weather ccnditÍons/Time of DaY:
#î.|A,:*"!
öbservation #/location/Method:
{e ;¿"
Elevatson:
SuweyMap5oi
f?"}'¡ÃС
Þepth fin!Terture RôcK Mâtfix Mottle Radox StruËture Structure consistence
Grade
LoosÉ
ÍrrãÞlë
f,frfr
Extr€rnely Fifm
FtSid
L6trsê
ffibTår'ffiffi-**
Ertré'fiely Frffn
RlBld
Fim
Lêos€
Êrsrd
FrÍãÞle,Èiffi'r
=Ëffiery
LÞor+
Frlabl€
Faûn
Ert¡emdyFí¡m
Rigld
l^ooÉe
Frltble
Flrn
Eftfۖelf Pir'lTr
n¡dd
Loose
Frisb¡ê
tirm
ÊlttfenìÊTY Firm
ffgid
YËl-."*_
4ÞdEret€ )"sW
Loore
We¡k
toose
-t"#ts*
Str¡m
We¡k
Mod€ràle
Strar|8
L¡c¡e
(
.4/eek-}
\fifdfäte
SÌrÞrg.
[oosE
\rue8t
Mode€tE
tlrong
Looçs
W€tk
Mcdprete
Strofit
f0Þrê
6r¡nül¡t
Pl¡tY
*!flrv:
triítråtir
str|81Þ Gr¡in
Àlffflvt
Grrîukt
PÞrr
,9ÞÉil*rr¡ltsile
gËgh€nlñ
Mãitlvê
t
6raûul+t
Fl¡r{
Blotkv
f.{'-6-i"rsÞ
SfficGrålß
Mãr:k ä
6r¡'lclla
P!rÌt
ülotly
PrlrrnttiG
Skr¡lcGf¡la
l/lxtlrrt
Efilrutar
plrrT
Biâcty
P?lttl!ülir
gingh Gråll!
*l*slv¿
Grâfü¡Þf
Plity
8lÒrl(v
F ls+trêlir.
fln¡l¿ Br¡h
ill¡rs'+e
Cûnc€nträtiô*s
Degletions
Glåyêd
Concentrations
Depletions
Gler¡ed
çonçentrêiicns
Þepfeticns
€leyed
Ccrrceñtrations
Þepletions
Gleyed
Çoncentretions
Depletions
Gleyed
Concentratlons
Depletitns
Gteyed
pÅ
.à
r/"
&e/ru
ÊM
fu**r+,
' fof'*'u'4w
8!'r+
¡r¡ If,4
Á//rêk-
W{*r+ **
#fløa¿nÌ6*n ff***
.4i isut Ç,i"trrî
Fß,qfi,tþ,"h&.&:, #ffi f)
'*qf,=æ¿ *tÅL'"\' w t
tu á:6Å fwtÞ¿
û * tÐrt
/Ð\* 34,;
i1%-üÌb'
Ccrnments:
{5ìÉñâtwe}It¡cenæfl (Dr?el
çèftlñed Sliltement: J hcrebv certify that I h¿ve carrrpleted this
wort in aqcordancewítfi allepplicaüle ordlnances, rules end lews.
gSGM Soll Prû,fftr Trt plt cn'phh Lot ]{umbon 1-
0 t 4 3 762
UÚÞTü IfI FEEÍ
3
Ércüllllbet
4
I
2
3
E
Ë
E
Ë
Ë
5
6
7
I
I
a
/a et L
t
rI -
Á -É ¡l¡¡t ^-rl
Ç l-
=!!l 7 rl
-f,rD )a \
¿t/,./a\¡I t
\
-I
¡
lt \-¡.t-,Ù rl )
¡_,^I
Å V t\U IJ t I
ã I I .a I^tÇ,ú
rt ì r!!I I/J¿
L ft )-a ¡)t !I Ì ra
¡
7 I ,t/I l,¡r It -
J 7 -t -a
I ,q
)
t-
Photo Log of Beattie Soil Testing
Date:513O123
Test Hole #1
*l.'-+*;:g -*-{{:*,ot*,/
F"
4,&-.'if
,r: ..,
2.'
.+r.
q-
T,Ë-"
Test Ho¡e #2
Ribbons: TEST HOIE 1 TESÍ HOIE 2
!
OWTS Design Report and Calculations
Project Location:Client:Kirk Beattie
631 CR 321
Rifle, Colorado 81650
Date: 26-May-23
Flow Data for the OWTS Design
1 Home Use (1 Bedroom Home)
Home Use
Section
Township
Range
19
6S
93W
300 gpd (per 46.6.c)
Total=300 epd
For Home Use, 2 persons per bedroom and 75 gallons per day per person, BOD5 = 0.06 #/person/day
Totals:
300 gpd
300 gpd
o.48 #ldaV
0.48 #/day
Soil Data for the OWTS
Data from on-site soil observations:
On site textural analysis reveals clay loam
Bed rock not encountered
Data from the web soil survey indicates a Potts Loam exists. Type 3A soil determined (for basal absorptiot
Average of 3 percolation holes: N/A mpi (Soil Tactile Analysis Perfomed)
Given the conslderation of all data, the long Term Acceptance Rate to use is 0.30 gallons/silday
Septic Tank Sizlng
3 Flow calculated from above: 300 gpd
48 hour detention time for septic tank sizing; Volume=
lnstall a 750 gallon tank for a single bedroom. (Per 46.6.c, min. two BR design)
600 cpd
Sizing of Absorpt¡on Field or Soil Treatment Area
4 Going with a soil type 3A and Treatment Level 1, LTAR =
For a pressure dosed system, size adjustment factor is 1.0 for a bed configuration
For a gravity system, the size adjustment factor shall be 1.2 for a bed configuration
For a gravity trench system, adjustment factor = 1.0
2
os clsrld
For a pressure dosed trench system, adjustment factor = 0.8
For use of chambers: size adustment factor is 0.7
STA= FIow/LTAR 1000 square feet (unfactored)
For a bed system, gravity flow, adjust size to 1.2*1000=
For a chamber trench system, gravity flow, adjust size to 0.7*1000=
lncorporating a pressure dosed trench system, adjust size to 0.8*700=
Pressure dosed bed system using chambers, adjustto 0.8*1200=
For a chamber system in a trench configuration, length=
Go with 4 trenches (each 3'x60')
1200 squarefeet
700 square feet
560 square feet
960 square feet
233 feet
With the effective length of a Quick4 chamber at 4', use 15 chambers per trench for a total of 60