HomeMy WebLinkAboutEngineer's Design and Site PlanGnnnELD Coururv OWTS Rrponr
Colonnoo HrcHwnv 13
Gnnnelo CouNTY, Colonnoo
Prepared by
June 2023
lnaColíber
0233 Countv Rood 265
Rlflc, CO 81650
970.625.¡lit¿+4
CollbrEnglnccrln gOOutlook.com
GnnTIELD COUNTY OWTS RTPORT
Colonnoo HlcHwnY 13
GnRrrrlo CouNTY, Colonnoo
"l hereby affirm that this Onsite Wastewater Treatment System (OWTS) report for Colorado
Highway 13, County Account Number R016046, Garfield County, Colorado 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."
l.^-*-- f- n-Lz;
License I
Licensed Professional Engineer, State of Colorado (Affix Seal)
Revreweo Bv:
Tennv Be¡¡oetl, P.E.
Caliber Engineering Project # 2022-006.001
2
Tnele Or COTrENTS
1.0 lntroduction
2.0 Preliminary Investigation
Property Information
Topography
Soil Data
Location of Physical Features
Additional lnformation
Landscape Position
Natural and Cultural Features
Gurrent and Historic Land Use
3.0 Detailed Soil lnvestigation
Visual Evaluation
Tactile Evaluation
4.0 Recommendations
5.0 lnstallation Observations
6.0 Operation and Preventative Maintenance Schedule
7.0 Limitations
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Appendix
OWTS Site Plan Sheet 1
OWTS Plan Sheet 2
OWTS Details Sheet 3
NRCS Soils Map
NRCS Absorption Field Soils Data
NRCS TexturalTriangle
Caliber Engineering, lnc. Soil Observation Logs
Caliber Engineering, lnc. SoilTexture by Feel
OWTS Design Spreadsheet
4
l.0lntroduction
At the time this report was developed, and according to Garfield County records, the subject property
. ls classified as Vacant Land.
o Comprises 49.68 acres.. Has an application submitted for minor subdivision into 3 lots. Lot 1 is proposed to have
14.984 acres, Lot215.Q23 acres and Lot 3 18.094 acres.
The subject property is located in rural Garfield County, approximately 7 miles north of Rifle off the
west side of State Highway 13. lt is being proposed by a member of the current Owner's family to
place a 4 bedroom modular home on Lot 1 of the minor subdivision. Although the minor subdivision
application is under review by the County and has not yet been approved, Caliber Engineering could
not find any restrictions in the County's Development Code that would prevent application for an
Onsite Wastewater Treatment System and/or building permit at this stage of the minor subdivision
application.
The purpose of this report is to present the preliminary investigation, reconnaissance information and
design for the onsite wastewater treatment system (OWTS) that will treat wastewater generated from
the proposed residence, as required by Garfield County's Regulation 43 (Reg 43).
Personnel contributing to this report are:
o Terry Bendetti - PEiCPOW Certified Competent Technician/NAWT Certified Designer
2.0 Preliminary lnvestigation
Property lnformation
PhvsicalAddress: 13 Highway, Rifle, Garfield County, Colorado 81650.
Lesal Description: Section 15, Township 5; Range 93; SENW & SWNE south of State Highway
13. The County's Account Number for the property is R016046 and the Parcel Number is
212915200056.
Existino Structures: There are no existing structures on the property.
Domestic Water: There is a constructed well on the subject property for domestic use, Permit
Number 320514-.
Sepflc: There are no existing septic systems on the subject property
Topography
From the southwest edge of Colorado State Highway to the northeast crest of Government Creek,
the topography runs from northeast towards the southwest at a grade of between 5 to 14 percent.
From the southwest bank of Government Creek to the northeast boundary of the 125 foot electric
line easement, the topography runs from southwesVwest to northeasVeast. Grades in this area
5
are estimated to be between 4 to 6 percent to the southwest crest of Government Creek. This
topography is adequate for an OWTS.
Soil Data
According to the Web Soil Survey developed by the Natural Resources Conservation Service
(NRCS), soils associated with the subject property are'classified as map units 3 and 47. NRCS
soil unit 3 is Arvada loam, which has grades of between 1 to 6 percent. This data agrees with
topography described for the area soil unit 3 is found.
NRCS soil unit 47 is Nihill channery loam, having grades between 6 to 25 percent. This data
agrees with the topography described for the area soil unit 47 is found.
NRCS septic tank absorption field data indicates the ability of the soil to distribute effluent into the
subsoils between the depth of 24 to 60 inches. The soils are rated both verbally and numerically.
Verbal ratings are "Not Limited", "Somewhat Limited" and "Very Limited". "Not Limited" and
"somewhat Limited" hinderances can be overcome or minimized fairly easily. "Very Limited"
requires a more stringent design to overcome.
The numerical rating indicates the severity of the limitation, with 0.01 being not severe to 1.00
being very severe.
The NRCS septic tank absorption field data are:
Soil unit 3 is very limited. The limitation is due to the slow movement of water through
these soils, numerical rating of 1.
Soil unit 47 is very limited. The limitation is due to steep slopes (numerical rating of 1)
and large stones (numerical rating of 0.05).
Plotting the percentages of clay, sand and silt published by the NRCS for soil units 3 and 47 on the
USDA Textural Triangle indicates:
NRCS soil unit 3 would classify as a silty clay loam per the USDA (United States
Department of Agriculture)soilclassification system. Silty clay loam soil has a long term
acceptance rate (LTAR) of between 0.30 and 0.35.
NRCS soil unit 47 has a rating for clay content of 21 percent. However, there are no
percentages recorded for sand and silt, so it was estimated that each would consist of
39.5 percent. As such, NRCS soil unit 47 would classify as Loam. Loam soils have a
LTAR of between 0.50 and 0.60, which is very favorable for a soil treatment area (STA).
The LTAR indicates the soils rate at which it will accept effluent, measured in volume per rate per
time, gallons/square fooVper day. The larger the LTAR, the better suited the soils are for allowing
movement of effluent through them, which requires less square footage for the STA.
However, actual LTAR's shall be determined based on data collected and analyzed per the detailed
soil investigation found later in this report.
a
a
a
a
6
Location of Physical Features
Physicalfeatures on the subject property that will require minimum horizontal setbacks stated in Table
7-1 are shown below. Alldistances are in feet.
' Well Potable
Water
Supply
Line
102
5
252
Structure with
Basement,
Crawl Space,
Footing
Drains
Property
10
102
ìo
Water
CourseLines/Easements
Septic
Tank
5
Septic
Tank
Efflueñt
Line
STA
502
502
1oo
5
0
50
502
503
2Crossings or encroachments may be permitted at the points as noted above provided that the water or wastewater
conveyance pipe is encased for the minimum setback distance on each side of the crossing. A length of pipe with a minimum
schedule 40 rating (ASTM Standard D 3034-16 (2016 version)) of sufficient diameter to easily slide over and completely
encase the conveyance must be used. Rigid end caps of at least schedule 40 rating (ASTM Standard D 3034-1 6 (201 6
version)) must be glued or secured in a watertight fashion to the ends of the encasement pipe. A hole of sufficient size to
accommodate the pipe must be drilled in the lowest section of the rigid cap so that the conveyance pipe rests on the bottom of
the encasement pipe. The area in which the pipe passes through the end caps must be sealed with an approved underground
sealant compatible with the piping used. Other methods of encasement that provide equal protection are allowed, but must be
approved by the local public health agency.
3Add eight feet additional distance for each 100 gallons per day of design flows between 1,000 and 2,000 gallons per day,
unless it can be demonstrated by a professional engineer or geologist by a hydrologic analysis or the use of a barrier,
consisting of a minimum 30 mil PVC liner or equivalent, that contamination will be minimized. lf effluent meets Treatment Level
3N and the local public health agency has a maintenance oversight program in accordance with section 14.D of Reg 43, the
distance addition is not required. Flows greater than 2,000 gallons per day must be hydrologically analyzed for flow, velocity,
hydraulic head, and other pertinent characteristics as means of estimating distances required to minimize contamination as
part of the Division s¡te application and permitting process.
Additional Information
a. Easements: There are existing easements on the subject property and are shown on sheet
2.
b. Floodplain Maps: According to FEMA (Federal Emergency Management Agency) there is
no floodplain map printed for this area.
Landscape Position
The landscape position for the STA is considered summit and the slope shape is linear - linear
(LL) towards the southeast.
Natural and Gultural Features
No natural or cultural features were identified in historical records
Gurrent and H¡storic Land Use
The subject property has been historically zoned rural and is expected to remain rural in the future.
3.0 Detailed Soil lnvestigation
A detailed soil investigation to determine the depth to the limiting layer, if any, and properly classify
the soil type was conducted on June 1,2023. Visual evaluation of two soil profile test pits were
conducted in the field and samples collected from each test pit.
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Test pits were excavated adjacent to the location proposed for the STA, see sheet 1 or 2'Íor locations.
Visual evaluation of both test pits was conducted under adequate lighting, with the soil being in an
unfrozen state.
Visual Evaluation
Two test pits, TP-1 and TP-2 were previously excavated on the subject property by the Owner.
These test pits were used to determine soil types, limiting layer and the best depth for the
infiltrative surface. Caliber Engineering, lnc. personnel evaluated and logged the excavations.
Test pit TP-1 was excavated to a depth of 120 inches. From the surface to 3 inches below, the
soil is topsoil. From the bottom of the topsoil zone to the bottom of the excavation, one horizon
was observed and exhibited characteristics of silty clay (sic).
The soil was light brown in color with a small pocket of gravel in the lower portion of the test pit.
A soil sample was collected from this pit between the depths of 241o 72 inches.
Test pit TP-2 was excavated to a depth of 96 inches. TP-2 also exhibited topsoil with a root zone
for the first 0 to 3 inches below surface, with one horizon being observed. Soils were light brown
in color. A soil sample was collected from this pit between the depths of 24 to 72 inches.
Soil observation logs and photos can be found in the Appendix.
All measurements are from ground surface.
Tactile Evaluation
On 611212023, Caliber Engineering, lnc. conducted a soil textural by feel evaluation on the soil
samples collected from test pits TP-1 and TP-2. Results of the soil gradation revealed:
1. Total sample size for TP-1 = 1,000 ml.
2. Percent rock in sample TP-1 = 2o/o.
3. Soils are not type "R".
Performing the soil texture by feel methodology on the TP-1 soil sample is shown in the following
table.
SAMPLE
Sample
Depth from
Ground
Surface (ft)
Does Soil
Form a Ball
(yes/no)
Does Soil
Form a
Ribbon
lves/no)
*Type of Ribbon
Formed (Weak,
Moderate,
Stronq)
How Does the Soil Feel
(Gritty/Smooth/Neither)
TP-1 2.0 - 6.0 Yes Yes S Smooth
*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.
I
SAMPLE
USDA Soil
Structure
TYPe
USDA Soil
Structure
Grade
TP-1 Blocky Moderate
TP-2 Blocky Moderate
According to Table 10-'1 , section 43.10 of Reg 43, soil types 3 and 3A can have a blocky structure
type, but only soiltype 3 can have a moderate soil structure grade. As such, the soilto receive
the effluent waste is classified as soil type 3. Soil type 3 has a LTAR of 0.35 gpd/ft2 for application
of effluent treated to treatment level 1 (TL1).
4.0 Recommendations
The proposed residence on the property will have 4 bedrooms. Under Reg 43, the design flow rate
for 4 bedrooms is 525 gallons per day (gpd). This is under the maximum 2,000 gpd requirement to
be approved and governed by the State, jurisdiction is under Garfield County's Reg 43. As such, an
OWTS as a wastewater treatment system is suitable for this site. At a minimum, the OWTS shall
have:
. A 1,250 gallon septic tank.
o A 6 hole distribution box.
o Four trench type STA, based on Arc-36 infiltrators.
. Category 3 distribution media in the STA.
o 4" diameter PVC service lines.
lnfluent from the residence will be conveyed through influent service lines, by gravity, to a new septic
tank. From the septic tank, effluent will be conveyed through effluent service lines to a distribution
box. The distribution box will divide the effluent flow into equal volumes to be delivered to each
trench. All influenUeffluent flow will be by gravity and influenVeffluent service lines shall be installed
per associated plans and details.
The proposed bedroom count is 4 and per Table 6-1 of Reg 43 the design flow rate will be 525 gpd.
The OWTS STA site elevation is approximately 5,920 feet above sea level (NAVD 88) and will be
located southeast of the proposed residence. The septic tank will also be installed southeast of the
residence. Both locations are shown on sheet 1.
Sewer Pipe: Sewer service influent pipe shall be 4-inch solid wall SDR-35 PVC installed per plans,
but may be adjusted in the field as field conditions warrant. The minimum grade for service lines shall
be 2% and the maximum grade shall be 17%. Step downs are required if service line grades exceed
17%. Joinls shall be solvent welded. Cleanouts are required:
1) Within 5 feet of the proposed structures.
2) At spacing not to exceed 100 feet.
3) Upslope of two or more bends closer than 10 feet.
I
# Bedrooms Occupancy (# of
Persons)
Wastewater Flow per
Person Design Flow (gpd)
4 7 75 525
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.
Septic Tanks: One new 1,250 gallon or larger septic tank with two bays will be required. The tank
must be on the Colorado Department of Public Health and Environment's accepted septic tank list.
The tanks and lids shallconform to current County OWTS regulations and be traffic rated. The tanks
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
at the tank outlet and its handle shall extend to within twelve inches of the lid.
The septic tank shall:
1) Be located down gradient of the home.
2) Have a covering of no more than 4.0 feet in depth nor less than 1.0 foot, measured from the
top of the tank lid to finished grade surface.
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 piping from the residence as shown on the plans. lf tank installation can't be
accomplished as shown on the plans, the tank can be set to have between 1.0 to 4.O-feet of cover
over its lid, measured from the top of the lid to surface grade. lf cover thickness is less than the
minimum 1.O-foot, or more than the maximum 4.0-feet, the tank can be moved closer or farther from
the residence to meet cover thickness requirements. Movement of the tank must be along the influent
or effluent service pipe alignments. A septic tank having a cover thickness less than 1.O-foot or
greater than 4.0- feet will not be allowed.
lf the tank is raised higher than shown on the plans and there is not at least a minimum cover of 48-
inches over the influent and/or effluent piping, insulation must be installed over the pipe per the detail
on sheet 3 until the minimum cover over the pipe is met.
Distribution Box: The distribution box shall be centered as shown on sheet 2 in a manner to distribute
effluent equally to the trench laterals. The Engineer should be contacted if alignments or locations
change to verify regulation requirements are maintained. The box should be capable of one inlet
pipe, having an insertion point a minimum of 1-inch above outlet openings and 4 outlet openings.
Boxes with more than 4 outlet openings will have the excess openings plugged.
Soil Treatment Area: The soil treatment area was sized using criteria found in section 43.10 of Reg
43 for a 4 bedroom residential home using:
. Trenches for the soil treatment area.
¡ Effluent application by gravity.
o Chambers for the distribution media.
The following table summarizes sizing of the STA.
No.
Bedrooms
Daily
Design
Flow (spd)
LTAR
Method of
Application
Adjustment Factor
Distribution
Media
Adjustment
Factor
Adjusted
STA
Size (sf)
No. Chambers
(1Ssf/chamber)
4 525 0.35 1.0 0.7 1,050 70
10
The STA shall be excavated as field conditions require using the following guidelines.
1. Fourtrenches, two having 17 infiltrators each and two having 18 each.
2. Trenches shall be no wider than 3 feet.
3. Trench lengths shall be no greater than 90 feet.
4. A minimum of 4 feet shall separate trenches, measured sidewall to sidewall
5. The infiltrative surface shall be between 0.5 to 4.00 feet from the surface.
6. Trench floors shall be level and set at the infiltrative surface.
7. Chambers shall be placed per the manufacturer's directions.
Chambers shall cover a minimum of 90% of the required excavated area per 43.13.E.1.d.
The STA shall have a final soil cover as described on sheet 3. This may mean that the STA cover
will need to be 16 inches +/- when initially placed to allow for settlement over the freeze-thaw of a
winter season. The surface of the STA shall be seeded after installation of the system. A native,
upland seed mix should be used. These mixes do not require irrigation and develop growth 10 to 15
inches high. No automatic sprinkler system shall be installed over the STA. Vehicular traffic and
livestock shall be kept off the STA. No landscaping, impervious surfaces or plastic sheeting can be
installed over the STA, which will reduce performance of the STA.
5.0 lnstallation Observations
lnstallation of the OWTS tank, influent lines, effluent lines, distribution box and infiltrators shall be
observed by the design engineer. Our office shall be notified by calling 970-6254344 at least three
days in advance to schedule personnel to observe installation of these features. lnstallation of these
features should be substantially complete and ready for backfill prior to requesting individual or
simultaneous observation inspections for these features.
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.
Septic tanks; The scum and sludge accumulation in the septic tanks shall be monitored yearly. Once
the cumulative scum or sludge thickness reaches 25% of 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.
Efftuent Fitten 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 can accommodate variable flows,
spreading water use over several hours and eliminating peak flows is recommended. To illustrate
the point, a malfunctioning toilet can discharge more than 1,000 GPD. Excessive daily loading could
flood and irreparably harm the STA.
11
Caliber Engineering, lnc. does not recommend connection of a water softener to the OWTS. 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 should be constructed for the backwash waste.
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. lncreased flows may hydraulically or organically overload
the OWTS, causing premature failure.
No landscaping or plastic can be used over the STA, which would reduce the performance of the
STA.
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 report 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, Caliber Engineering, lnc. shall be called to evaluate the conditions. lf the
proposed construction is changed, Caliber Engineering, lnc. shall be notified to evaluate the effect
changes have on the OWTS, priorto the changes being made. Allconstruction shallbe in accordance
with Garfield County's Reg 43. Pipe type and size, burial requirements, septic tank construction, and
other specifications, which are not depicted in this report, shall conform to the requirements of the
County's Reg 43. The installer of the system shall be acceptable by the County's Environmental
Health Department.
12
Appendix
OWTS Site Plan Sheet I
OWTS Plan Sheet 2
OWTS Details Sheet 3
NRGS Soils Map
NRCS Absorption Field Soils Data
NRCS Textural Triangle
Galiber Engineering, lnc. Soil Observation Logs
Caliber Engineeringn lnc. Soil Texture by Feel
OWTS Design Spreadsheet
13
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NRCS Soils Mup
3 Soil Map-Rifle Area, Colorado, Parts of Garfield and Mesa Counties
(Shelton Minor Subdivision)
rem 25æm
2581ó
Web Soil Survey
National Cooperative Soil Survey
?57æJ
Natural Resources
Conservation Service
Æ71æ 257800 E7W
257ffi ÆTKß x7ffi Etm 258m
¡4ap S(ale: 1 :4,940 if printed on A lanGcape ( 1 1" x 8.5) sh€€t
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M ã8500 2586m
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Page 1 of 3
390 36'44'N
25m 25æm 2584æ 25&5m
390 36',4A'N
Natural Resources
Gonse¡vation Service
Soil MahRifle Area, Colorado, Parts of Garfield and Mesa Counties
(Shelton Minor Subdivision)
Web Soil Survey
National Cooperative Soil Survey
4t26t2023USDA
-
t
MAP LEGEND MAP INFORMATION
The soil surveys that comprise your AOI were mapped at
1:24,000.
Waming: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping c¿¡n cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated fom the USDA-NRCS certif¡ed data as
of the version date(s) listed below.
Soil Survey Area: Rifle Area, Colorado, Parts of Garfield and
Mesa Counties
SurveyArea Data: Version 15, Sep 6,2022
Soil map units are labeled (as space allows) for map scales
l:50,000 or larger.
Date(s) aerial images were photographed: Aug 25, 2021-Sep
5,2021
The orthophoto or other base map on which the soil lines were
compiled and digitized probably difiers from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Area of lnterest (AOl)
Soils
Area of lnterest (AOl)
Soil Map Unit Polygons
E Spoil Area
û Stony Spot
ffi VeryStonySpot
$ wet Spot
.A Other
.) Special Line Features
Water Features
Streams and Canals
Transportat¡on
t{+ Rails
ñt lnterstate Highways
,Ë,3 US Routes
Major Roads
Local Roads
Background
I Aerial Photography
I Soil Map Unit Points
Special Point Features
{9¡ Blowout
EI Bonow Pit
X Clay Spot
O Closed Depression
X Gravel Pit
"1 Gravelly Spot
{} Landfill
Å" Lava Flow
éb Marsh orswamp
æ M¡ne or Quarry
€Þ Miscellanêous Water
I Perennial Water
1¡ Rock Outcrop
+ Saline Spot
:": Sandy spot
€ Severely Eroded Spot
* Sinkhole
F, Slide or Slip
ø Sodic Spot
Page 2 of 3
Soil Map-Rifle Area, Colorado, Parts of Garfield and Mesa Counties Shelton Minor Subdivision
Map Unit Legend
Map Un¡t Symbol Map Unit Name Acres in AOI Percent of AOI
3 Arvada loam, 1 to 6 percent
slopes
45.2 38.5%
34 lldefonso stony loam, 25 to 45
percent slopes
1.9 1.7o/o
47 Nihill channery loam, 6 to 25
percent slopes
57.0 48.4%
66 Torriorthents-Camborthids-
Rock outcrop complex,
steep
13.5 11.4o/o
Totals for Area of Inte¡est 117.6 '100.0%
USÞA:Conservation Service
Web Soil Survey
National Cooperative Soil Survey
4t26t2023
Page 3 of 3
NRCS Absorption Field Soils Data
=
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3
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Septìc Tank Absorption Fields-Rifle Area, Colorado, Parts of Garfield and Mesa Counties
(Shelton Minor Subdivision)
25l9m 258m 2581æ M 2s8300
251800 257W 258m 2591û
257ffi
Natural Resources
Conservation Service
2577Ø
257tn 5f7û
Map Scaþ: 1 :4,940 if printed orì A landscape ( 11" x 8.5) sheet
Metes0501æm3æ_ ¡figqt0 200 4æ 8m 1m
Mapprojeriion: Web¡4ercabr Comeræordinates:WGS84 ftgettcs:UIMZonel3NWGSI4
M 258600 2586m
39. 37 11" N
æ. 36'44' N
390 37 11" N
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National Cooperative Soil Survey
412612023
Page 1 of 5
M æm 2584m 2585m
39.36',48'N
USDA:_
L
Natural Resources
Gonsewation Service
Septic Tank Absorption Fields-Rifle Area, Colorado, Parts of Garfield and Mesa Counties
(Shelton Minor Subdivision)
Web Soil Survey
National Cooperative Soil Survey
4t26t2023
Page 2 of 5
MAP LEGEND MAP INFORMATION
The soil surveys that comprise your AOI were mapped at
1:24,OOO.
Waming: Soil Map may not be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mapping and accuracy of soil
line placement. The maps do not show the small areas of
contrasting soils that could have been shown at a more detailed
scale.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Rifle Area, Colorado, Parts of Garfield and
Mesa Counties
SurveyArea Data: Version 15, Sep 6,2022
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial ¡mages were photographed: Aug 25, 2021-Sep
5,2021
The orthophoto or other base map on which the soil lines were
compiled and digitized probably difiers from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be ev¡dent.
Area of lnterest (AOl)
i] Area of lnterest (AOl)
Soils
Soil Rat¡ng Polygons
I Verylimited
E Somewhat limited
E Notlimited
f] Not rated or not available
So¡l Rat¡ng Lines
rryr Very l¡mited
. r Somewhat l¡mited
t* Notlimited
. t Not rated or not ava¡lable
Soil Rat¡ng Po¡nts
I Verylimited
tr Somewhat lim¡ted
I Not limited
tr Not rated or not ava¡lable
Water Features
Streams and Canals
Transportât¡on
Rails
xt lnterstate Highways
,qd¡ US Routes
Major Roads
Local Roads
Background
I Aerial Photography
Septic Tank Absorption Fields-Rifle Area, Colorado, Parts of Garfield and Mesa Counties Shelton Minor Subdivision
Septic Tank Absorption Fields
Map unit
symbol
Map unit name Rating Component
name (percent)
Rat¡ng rêasons
(numerlc
values)
Acres in AOI Percent of AOI
3 Arvada loam, 1
to 6 percent
slopes
Very limited Arvada (80%)Slow water
movement
(1.00)
45.2 38.5%
34 lldefonso stony
loam, 25 to 45
percênt slopes
Very limited lldefonso (90%)Slope (1.00)1.9 1.7o/o
Large stones
(1.00)
47 Nihill channery
loam, 6 to 25
percent slopes
Very limited Nihiil (85%)Slope (1.00)57.0 48.4%
Large stones
(0.05)
66 Torriorthents-
Camborthids-
Rock outcrop
complex,
steep
Very limited Torriorthents,
steep (45%)
Depth to bedrock
(1.00)
13.5 11.4o/o
Slope (1.00)
Camborthids,
steep (20%)
Slow water
movement
(1.00)
Slope ('1.00)
Depth to bedrock
(r.00)
Totals for Area of lnterêst 117.6 lOO.Oo/o
Rating Acres in AOI Percent of AOI
Very limited 117.6 '100.0o/o
Totals for Area of Interest 117.6 100.0%
USDA:Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
412612023
Page 3 of 5
Septic Tank Absorption Fields-Rifle Area, Colorado, Parts of Garfield and Mesa Counties Shelton Minor Subdivision
Description
Septic tank absorption fields are areas in which effluent from a septic tank is
distributed into the soil through subsurface tiles or perforated pipe. Only that part
of the soil between depths of 24 and 60 inches is evaluated. The ratings are
based on the soil properties that affect absorption of the effluent, construction
and maintenance of the system, and public health. Saturated hydraulic
conductivity (Ksat), depth to a water table, ponding, depth to bedrock or a
cemented pan, and flooding affect absorption of the effluent. Stones and
boulders, ice, and bedrock or a cemented pan interfere with installation.
Subsidence interferes with installation and maintenance. Excessive slope may
cause lateral seepage and surfacing of the effluent in downslope areas.
Some soils are underlain by loose sand and gravel or fractured bedrock at a
depth of less than 4 feet below the distribution lines. ln these soils the absorption
field may not adequately filter the effluent, particularly when the system is new.
As a result, the ground water may become contaminated.
The ratings are both verbal and numerical. Rating class terms indicate the extent
to which the soils are limited by all of the soil features that affect the specified
use. "Not limited" indicates that the soil has features that are very favorable for
the specified use. Good performance and very low maintenance can be
expected. "Somewhat limited" indicates that the soil has features that are
moderately favorable for the specified use. The limitations can be overcome or
minimized by special planning, design, or installation. Fair performance and
moderate maintenance can be expected. "Very limited" indicates that the soil has
one or more features that are unfavorable for the specified use. The limitations
generally cannot be overcome without major soil reclamation, special design, or
expensive installation procedures. Poor performance and high maintenance can
be expected.
Numerical ratings indicate the severity of individual limitations. The ratings are
shown as decimal fractions ranging from 0.01 to 1.00. They indicate gradations
between the point at which a soil feature has the greatest negative impact on the
use (1.00) and the point at which the soil feature is not a limitation (0.00).
The map unit components listed for each map unit in the accompanying
Summary by Map Unit table in Web Soil Survey or the Aggregation Report in Soil
Data Viewer are determined by the aggregation method chosen. An aggregated
rating class is shown for each map unit. The components listed for each map unit
are only those that have the same rating class as listed for the map unit. The
percent composition of each component in a particular map unit is presented to
help the user better understand the percentage of each map unit that has the
rating presented.
Other components with different ratings may be present in each map unit. The
ratings for allcomponents, regardless of the map unit aggregated rating, can be
viewed by generating the equivalent report from the Soil Reports tab in Web Soil
Survey or from the Soil Data Mart site. Onsite investigation may be needed to
validate these interpretations and to confirm the identity of the soil on a given
site.
USDA*-Natura! Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
412612023
Page 4 of 5
Septic Tank Absorption Fields-Rifle Area, Colorado, Parts of Garfield and Mesa Counties Shelton Minor Subdivision
Rating Options
Aggregation Method: Dominant Condition
Aggregation is the process by which a set of component attribute values is
reduced to a single value that represents the map unit as a whole.
A map unit is typically composed of one or more "components". A component is
either some type of soil or some nonsoil entity, e.9., rock outcrop. For the
attribute being aggregated, the first step of the aggregation process is to derive
one attribute value for each of a map unit's components. From this set of
component attributes, the next step of the aggregation process derives a single
value that represents the map unit as a whole. Once a single value for each map
unit is derived, a thematic map for soil map units can be rendered. Aggregation
must be done because, on any soil map, map units are delineated but
components are not.
For each of a map unit's components, a corresponding percent composition is
recorded. A percent composition of 60 indicates that the corresponding
component typically makes up approximately 60% of the map unit. Percent
composition is a critical factor in some, but not all, aggregation methods.
The aggregation method "Dominant Condition" first groups like attribute values
for the components in a map unit. For each group, percent composition is set to
the sum of the percent composition of all components participating in that group.
These groups now represent "conditions" rather than components. The attribute
value associated with the group with the highest cumulative percent composition
is returned. lf more than one group shares the highest cumulative percent
composition, the corresponding "tie-break" rule determines which value should
be returned. The "tie-break" rule indicates whether the lower or higher group
value should be returned in the case of a percent composition tie. The result
returned by this aggregation method represents the dominant condition
throughout the map unit only when no tie has occurred.
Component Percent Cutoff: None Specified
Components whose percent composition is below the cutoff value will not be
considered. lf no cutoff value is specified, all components in the database will be
considered. The data for some contrasting soils of minor extent may not be in the
database, and therefore are not considered.
Tie-break Ru/e; Higher
The tie-break rule indicates which value should be selected from a set of multiple
candidate values, or which value should be selected in the event of a percent
composition tie.
USDA--Natural Resources
Conservation Service
Web Soil Survey
National Cooperat¡ve Soil Survey
412612023
Page 5 of 5
NRCS Textural Triangle
NRCS Soil Unit 3
2
lg
Treatment levels are defined in Table 6.3
I lAreas outside the dashed box require deslgn by a professional engineer
r00
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2A
3A
Textural
Triangle
In
SolfftpGs gl 3A
20
80
30
70
40
50
Soll Type 2 or 2A
"{m t0
BASED ON REGULATION 43 TABLE 10-1
For Soils wfth Less Than 35 Percent Rock Fragments. Rock tragments are larger than 2 millimeters.
Soll Treatment Area long Term Acceptance Rates by Soll Texture, Soll Structure, Percolatlon Rates and Treatment Lcvel
Long-term Acceptance R¡te (tTARl
Gallons per day per squarc footSoll Type, Texture, Structure and Pcrcolatlon Rôte Rante
l¡vcl2ilt
lfa¡ünant
lo¡l gilt'
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S¡ndy Lo¡m
Loam
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Mod¿råte
Stron¡1&25 0.60 1.00 1.00 1.10 1.10
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Sandy Lotm
loam
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6lt5
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d¡y Loâm
Sllty Cl¡y lo¡m
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Sllty Cl.y Lorm
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100
Sand
30 l0
00
NRCS Soil Unit 47
2
l3
Treatment levels are defìned in Table 6,3
I lAreas outside the dashed box require deslgn by a professional engineer
r00
l0
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90
20
80
30
C
SolllypcSor3Â 30
60
50
60 50
50
40
Soll lype 2 or 2A
{m 't0
100 90 80 70
BASED ON REGULATION 43 TABLE 1O-1
For Soils with Less Than 35 Percent Rock Fragments. Rock Fragments are larger than 2 millimeters.
Soll Treatment Area Long Term Acceptancc Rates by Soll Texture, Soll Strusture, Percolatlon Rates and Treatment Level
long-term Acceptance R¡te (tTARl
Grllons per day per square footSoll Type, Texture, Structure and Percolatlon Rate Range
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Caliber Engineering, Inc. Soil Texture by Feel
TP-1
Soil Texture by Feel Does the soil remain in a ball when squeezed?
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 forefinger,
breaking from
its own
weight.
B¿¡ed on USDA I'1f,(96uidetoTextur€ by teel -S.J.Th¡en,1979, modilied.
Ihis v¿r¡ðl¡0n (r€àted by D Har¡son, M Srown,W 8rown, fi L¿ws.
iYes
ls the soil too dry?
No Yes
ls the soiltoo wet?
No
Yes No
Add water
,:l
udd d ry soil
What
Forms a weak
ribbon less
than l " before
breaking
loam
Soil Type 2 or 2A
Sandy loam
Siltloam
2
Does soil feel very gritty? Yes
Does soil feel very smooth? Yes
Neither gritty nor smooth? Yes
No
No
Forms a1-2"
ribbon before
breaking
ffi ng
sa
2" ofribbo
lo
Fxcessively rr.ret
.r pinch of soil in
pahn arrd ru[r with
forc.fingcr.
¡ . --.¿
¿
¡ -.¡
;.+-f '9
-Ëv
t
the soil form a ribbon?
No
loam
lf phty ilrucftr. thrn roll typr 5
OWTS Design Spreadsheet
Highway 13, Rifle, Garfield County, Colorado
SITE CRITER¡A
Soil Type tTAR
Design
Flow
(cPD)
525# Bedrooms
Total Design Flows
Slze Adjustment for Method of Appllcation =
Size Adjustment for Type of Distribution =
Adjusted STA Size =
Number of lnf¡ltrators =
Total Length of lnfiltrators =
Maximum Dlstribution Length =
Number of Trenches =
Number of lnfiltrators per Trench =
L
2
0.35
on Table 10.1
1
o.7
Based on 15 ft2 bottom area.
ft
ft
2A
3
3A
4
4A
5
Soil Loading Rate =
Soil Treatment Area = STA = Design FlodtTAR 15oo ft2
Size Adlustment Factors for Method of Appl¡cat¡on ln STA
Type of Absorption
Area Method of Effluent Applcation
Dosed
(siphon or Pressure
Gravity PumP) Dosed
Trench
Bed
Size Adjustment Factors for Types of Distrlbutlon Media in STA
Category2 Category3-
Category 1- -Other Chambersor
Rock or Tire MFG Enhanced
Chips Media Media
Type of Absorption
Area
x
X
1050 ft2
70
350
90
4
18
Use :
4
x
@
Septic Tank Size =LzSO gallons