HomeMy WebLinkAboutOWTS DesignGnnTIELD COUNTY OWTS RTPONT
209 Cronn Bnenrcs Rono
GnnTIELD COUrurY, COLORADO
May 2022
Prepared by
Colìber Engíneerlng, lnc.
0235 Countv Rood 265
Rlfle, C0 81650
970.625.+344
CollbrEnglneerln gOOutlook. com
GnnTIELD COUNTY OWTS RTPONT
209 Cronn Bnrnrs Rono
Gnnr¡ELD Coururv, CotoRADo
"l hereby affirm that this Onsite Wastewater Treatment System (OWTS) report for 209 Cedar
Breaks Road, 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."
fr*f,n*¿,æ License No
Licensed Professional Engineer, State of Colorado (Affix Seal)
Revrrweo Bv:
TERRY BENDETTI, P.E.
Caliber Engineering Project # 2022-007 .001
2
Tnelr Or CO¡ITENTS
{.0 lntroduction
2.0 Preliminary lnvestigation
Property lnformation
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.O Limltations
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Appendix
OWTS Site Plan Sheet 1
OWTS Details Sheet 2
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
1.0 lntroduction
At the time this report was developed the subject property
r ls classified as Vacant Land.o Comprises 40.209 acres.o Located in the Grass Mesa Ranch Subdivision, Garfield County, Colorado.
It is being proposed by the current Owner for development of a two þedroom single family residence
on the subject property.
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 a3 (Reg 43).
Personnel contributing to this report are:
o Terry Bendetti- PE/CPOW Certified Competent Technician/NAWT Certified Designer
2.0 Preliminary lnvestigation
Property lnformation
Phvsical Address: 209 Cedar Breaks Road, Garfield County, Rifle, Colorado 81650.
Leqal Description: Lot27, Grass Mesa Ranch Subdivision; S28, T6N, R93W; S2ESE, S2SWSE.
Cour*ys Àccount Number for the property is R247337 and the Parcel Number is 217728400459.
Existinq Structures: There is an existing structure on the property used for storage, dimensions
of 40 feet x 32 feet.
Domestic Water: There are no wells on the subject property. According to the Colorado
Department of Water Resources there are two wells in the vicinity of the subject property, which
are:
1. Permit No. 33564-MH for monitoring hole (notice of intent)
2. Permit No. 272630 for residential and domestic use.
Location of these wells are shown on sheet 1.
Sepfr'c: There are no existing septic systems on the subject property, Lot 27. Lots 26 and 28
each have an active lndividual Sewage Disposal System (ISDS) in place.
Topography
Topography in the vicinity where the new OWTS will be located slopes from southeast towards
the northwest at average grades of between I to 12 percent.
5
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 45. NRCS soil unit
45 is Morval-Tridell complex, which has grades of between 6 to 25 percent. This data agrees with
field observation.
NRCS soil data indicates soil unit 45 is very limited for septic tank absorption fields due to slow
movement of water and large stones. This agrees with field observations of the two test pits;
texture of the in-place pit soils exhibited characteristics that allowed the soil to be formed into a
ball, indicating silty or clayey soils. ln addition, larger stones were encountered in the test pits.
However, by observation, it is the opinion of Caliber Engineering, lnc. that soil characteristics and
stones encountered in the test pits will not prevent adequate installation and operation of an
OWTS.
Plotting the percentages of clay, sand and silt published by the NRCS for soil unit 45 on the USDA
Texturàl Triangle indicates the soilwould classify as a loam. However, in the field the soils could
be molded, which is a characteristic of a silt or clay loam soil. Silt Loam soils have a classification
of type 2 or 2A and clay loam soils have a classification of type 3 or 3A, both are suitable for
absorption fields. The long term application rates (LTAR) for type 2 and 2A soils are 0.6 and 0.5
gallons per day per square foot of area (gpd/ft2), respectively; type 3 and 3A soils are 0.30 and
0.35 gpd/ft2, respectively.
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.
Septic Tank
' Effluent Line
Potable Water
Supply Line
102
5
Structure without
Basement, Crawl
Space, Footing
Drains
5
0
Well
sG
50
Property
Lines
Septic
Tank
102
10STA10
2Crossings or encroachments may be permitted at the points as noted above provided that the water or wastewater
conveyañce pipe is encased for the minimum setback distance on each side of the crossing. A length of pipe with a minimum
schedúte 40 rating (ASTM Standard D 3034-1 6 (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 3034-16 (2016
version)) must be glued or secured in a watertight fashion to the ends of the encasement pipe. A hole of sufficient size to
accommodate theiipe must be drilled in the lowest section of the rigid cap so that the conveyance p¡pe rests on the bottom of
the encasement pipe. The area in which the pipe passes through the end caps must be sealed w¡th 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.
Additional lnformation
Easements: Existing easements on site are shown on sheet 1. lnstallation of this OWTS
will not interfere with the operation or maintenance requirements associated with any
easement's purpose.
6
a.
b. Floodplain Maps: According to FEMA (Federal Emergency Management Agency) the
floodplain panel for this location is 080205 13658, which is not printed. This indicates
flooding does not present ahazard.
Landscape Position
The landscape position for the STA is considered back/side and the slope shape is linear - linear
(LL) towards the northwest.
Natural and Cultural Features
No natural or cultural features were identified in the site reconnaissance.
Current and Historic 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 April 12, 2022. Visual evaluation of two soil profile test pits were
conducted in the field and samples collected from each test pit.
Test pits were excavated adjacent to the location proposed for the STA, see sheet 1 for locations.
Visual evaluation of both test pits was conducted under adequate light conditions, 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 or
Owner's Excavator. 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 exhibited topsoil with a root zone for the first 0 to 10 inches. One horizon between
the bottom of the topsoil zone and bottom of the pit was observed. The soil exhibited
characteristics of silty clay loam (sicl). Larger rocks were observed in the test pit. A soil sample
was collected from this pit.
Test pit TP-2 also exhibited topsoil with a root zone for the first 0 to 10 inches, with one horizon
from the bottom of the topsoil zone to the bottom of the pit. Soils in TP-2 also exhibited
characteristics of sicl with larger rocks. A soil sample was collected from this pit.
Excavation was terminated at a depth of 60 inches (5 feet) for both test pits. Discussion with the
General Contractor indicated excavation was terminated at this depth due to the mini-excavator
being too small. Neither pit showed signs of:
r A limiting layer.
. Presence of groundwater
7
Soil observation logs and photos can be found in the Appendix.
All measurements are from ground surface
Tactile Evaluation
On 412612O22, Caliber Engineering, lnc. conducted a soil textural by feel evaluation on the soil
sample collected from test pit TP-1. Results of the soil gradation revealed:
1. Total sample size = 1,000 ml.
2. Percent rock in sample TP-1 = 19o/o
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 sandy loam, soil type 2 or
2A..
Due to the visual similarities between the soil samples from test pits TP-1 and TP-2, soils from
test pit TP-2 were not evaluated. lt is Caliber Engineering, lnc. opinion that similar results would
be obtained from evaluating the soil sample from test pit TP-2.
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 SoiI
Structure
Tvpe
USDA Soil
Structure
Grade
TP-1 Blocky Strono
According to Table 10-1 , section 43.10 of Reg 43, soil types 2 and 2A can have a blocky structure
type, but only soil type 2 can have a strong soil structure grade. As such, the soil to receive the
effluent waste is classified as soil type 2. Soil type 2 has a LTAR of 0.60 gpdlft2 for the
application of effluent treated to treatment level 1 (TL1),
4.0 Recommendations
An OWTS as a wastewater treatment system is suitable for this site. At a minimum, the OWTS shall
have:
o A septic tank.r Two trench type STA.o Category 3 distribution media in the STA.o One distribution box.
I
SAMPLE
Sample
Depth from
Ground
Surface (ft)
Does Soil
Form a Ball
(yes/no)
Does Soil
Form a
Ribbon
(ves/no)
*Type of Ribbon
Formed (Weak,
Moderate,
Stronql
How Does the Soil Feel
( G ritty/S mooth/Neithe r)
TP-1 4.0 Yes Yes W Grittv
a 4" diameter PVC service lines.
lnfluent from the residence will be conveyed through service lines, by gravity, to a new septic tank.
From the septic tank, effluent will be conveyed through service lines to a distribution box. The
distribution box will divide the effluent flow into equal volumes to be delivered to each trench. All
effluent flow will be by gravity and influent/effluent lines shall be installed per associated plans and
details.
The proposed residence is a 2-bedroom single family residence. Per Table 6-1 of Reg43 the design
flow rate will be 300 gpd (gallons per day).
The OWTS STA site elevation is approximately 6,520 feet above sea level (NAVD 88) and will be
located northeast of the proposed residence. The septic tank will be installed north/northeast of the
residence. Both locations are shown on sheet 1.
Sewer Pipe: Sewer service 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 2o/o
and the maximum grade shall be 17%. Step downs are required if service line grades will exceed
17o/o. Joints shall be solvent welded. Cleanouts are required:
1) Within 5 feet of the 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 2.
Septic Tanks: One new 1,000 gallon 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 shall conform 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 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 feet, 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.O-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
I
# Bedrooms Occupancy (# of
Persons)
Wastewater Flow per
Person Design Flow (gpd)
2 4 75 300
or effluent 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 36-
inches over the influent and/or effluent piping, insulation must be installed over the pipe per the detail
on sheet 2 until the minimum cover over the pipe is met.
Distribution Box: The distribution box shall be centered as shown on sheet 1 in a manner to distribute
effluent equally to the distribution lateral manifolds. 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 2 outlet
openings. Boxes with more than two 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 Reg43
for a 2-bedroom residential home using:
. Trenches for the soil treatment area. Effluent application by gravity.
. Chambers for the distribution media
The following table summarizes sizing of the STA
The STA shall be excavated as field conditions require using the following guidelines
1. Two trenches, one having 12 infiltrators and the other 1 1 infiltrators.
2. Trenches shall be no wider than 3 feet.
3. Trench lengths shall be no greater than 60 feet.
4. A minimum of 4 feet shall separate trenches, measured sidewall to sidewall
5. The infiltrative surface shall be between 3 to 4 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 43.1 3. E.1 .d.
The STA shall have a final soil cover as described on sheet 2. This may mean that the SÏA 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 a 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'
No.
Bedrooms
Daily
Design
Flow (gpd)
LTAR
Method of
Application
Adjustment Factor
Distribution
Media
Adjustment
Factor
Adjusted
STA
Size (sf)
No. Chambers
(1Ssf/chamber)
2 300 0.60 1.0 0.7 350 23
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5.0 lnstallation Observations
lnstallation of the OWTS tank, effluent lines, distribution box and infiltrators shall be observed by the
design engineer. Our office shall be notified by calling 970-625-4344 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 to be backfilled 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
mainienance to the onsite wastewater system to allow for proper, long-term functioning of the system.
Sepfic fanks: The scum and sludge accumulation in the septic tanks shall be monitored yearly. Once
the cumulative scum or sludge thickness reaches 25o/o 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.
Effluent Fitter. 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
pubtic 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.
Caliber Engineering, lnc. recommends against installation of a water softener. The chemical and
hydraulic lıading fiom the backwash of a water softener would be damaging to the STA, so if a
softener is installed, a separate drywell shall 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 attachèd 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.
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7.0 Limitations
Our investigation, layout, design, and recommendations are based on site visits and the best
information ãvailable 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 ditferent from those described in this
ieport 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 of
ihe'changes on the OWTS prior to the changes being made. All construction shall be in accordance
with the Garfield County OWfS Regulations. 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 OWTS Regulations. The installer of the system shall be acceptable by
the County's Environmental Health Department.
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Appendix
OWTS Site Plan Sheet I
OWTS Details Sheet 2
NRCS Soils Map
NRCS Absorption Field Soils Data
NRGS Textural Triangle
Galiber Engineering, lnc. Soil Observation Logs
Caliber Engineering, lnc. Soil Texture by Feel
OWTS Design Spreadsheet
13
I
GENERAL NOTES:
ff IS THE CONTRACTOR'S RESPONSIBILITY TO VERItr EXßNNG UNUTIES MTH THE U
NOnFtCAnON CENTER OF COLORADO (UNCC) AND/OR UT1LITY COMPANTES PRþR rO
ANY EXCAVATNN GREATER THAN 2 FEET.
rsürwùüDd$iß
&llmonru¡øn
CNCC 1 -800-922-1987
I
1
I
!l
INFILTRATOR WATER TECHA
CHAMBER PRODUCT S
(No scALE)
ARC J6 CHAMBER
TOP VIEW
NSPECNON PORT
6J.5'
SIDE VIEW END VIEW
60'J1
(EFFECTIVE LENGTH)
CHAMBER NOTES:
I. CHAMBERS MUST BE INSTALLED WTH THE BASE OF THE UNIT
N_SITU SOIL, OR IF PUCED ON ACCEPTABLE TIEDIA, THE
MANUFACTURERS, INSTALUNON NSTRUCNONS MUST BE FOLLC
TO PREVENT CHAMBERS FROM SETTLING NTO THE MEDIA.
2. INSTALUTION MUST BE IN ACCORDANCE WTH MANUFACTURER:
INSTRUCNONS.
î3'J
INFLTRATOR WATER TECHNOLOGIES
TYPICAL TRENCH DETAL
SECTION VIEW
(No scALE)
T roPSorL
NRCS SOISMAP
=bR3sRoSoil Matr-Rifle Area, Colorado, Parts of Garfield and Mesa Counties(Soil Map - 209 Cedar Breaks Road)Web Soil SurveyNational Cooperative Soil SurveY3SÞ 29 3û'N3ÉP 2930'N$ggpq$qIÞRçF2ô198tøæ1/m26'1510Plap Scale: 111,600 if prinÞd on A hndsoæ (11" x 8'9) sheet'oæ40801nft€t0501m2m3mf\4ap prûjedim: Wêb f\4efttsM Corner@rdinates: WGS84 Setics: UIM zone 13NWGS&12ñm3IbRa3r¡rIRoNANatural ResourcesConservation Service4t2312A22Page 1 of33tr 2922NTJSDA=?615tO2616æ261660g 8?zN
USDA=Natural ResourcesConservation ServiceSoil Map-Rifle Area, Colorado, Parts of Garfield and Mesa Counties(So¡l Map - 209 Cedar Breaks Road)Web Soil SurveyNational Cooperative Soil Survey4t23t2022Page 2 of 3MAP LEGENDMAP INFORMATIONThe soil surveys that comprise your AOI were mapped at1:24,000.Warning: Soil Map may not be valid at this scale.Enlargement of maps beyond the scale of mapping can c€¡usemisunderstanding of the detail of mapping and accuracy of soilline placement. The maps do not show the small areas ofcontrasting soils that could have been shown at a more detailedscale.Please rely on the bar scale on each map sheet for mapmeasurements.Source of Map: Natural Resources Conservation ServiceWeb Soil Survey URL:Coordinate System: Web Mercator (EPSG:3857)Maps from the Web Soil Survey are based on the Web Mercatorprojection, which preserves direction and shape but distortsdistance and area. A projection that preserves area, such as theAlbers equal-area conic projection, should be used if moreaccurate calculations of distance or area are required.This product is generated from the USDA-NRCS certified data asof the version date(s) listed below.Soil Survey Area: Rifle Area, Colorado, Parts of Garfield andMesa CountiesSurvey Area Data: Vers¡on 14, Sep 2,202'lSoil map units are labeled (as space allows) for map scales1:50,000 or larger.Date(s) aerial images were photographed: Aug 25, 2021-Sep5,2021The orthophoto or other base map on which the soil lines werecompiled and digitized probably difiers from the backgroundìmagery displayed on these maps. As a result, some minorshifting of map unit boundaries may be evident.Area of lnterest (AOl)ã Spoil Area$ Stony Spot& VeryStonySpottr Wet Spot¿l Otherúr Special Line FeaturesWater Features.,ÊÞr Streams and CanalsTransportation¡ç.,¡ Railsd lnterstate Highwaysñ# US Routesi,:r-.r;! Major RoadsLocâl RoadsBackgroundI Aerial PhotographyArea of lnterest (AOl)SoilsE Soil Map Unit PolygonsH Soil Map Unit LinesI Soil Map Un¡t PointsSpecial Po¡nt Features(g, Blowoute Borrow Pittr Clay Spot* Closed Depression),ç Gravel Pit.1 Gravelly SpotÖ Landfilltl. Lava Flow¡¡} Marsh or swamp{* Mine or QuarryO Miscellaneous\Â/bterS Perenn¡al \^/ater\¡r Rock Outcrop+ Saline Spot:": SandY sPotiå Severely Eroded SpotS Sinkholeþ Slide or Slipø sodic spot
Soil Map-Rifle Area, Colorado, Parts of Garfield and Mesa Counties Soil Map - 209 Cedar Breaks Road
Map Unit Legend
MapUnitSymbol ilap Unlt Name Aeres in AOI Percent ofAOl
45 Morval-Tridell comPlex, 6 to 25
percent slopes
4.9 38.7o/o
67 Torriorthents-Rock outcroP
complex, steep
7.8 61.3o/o
Totals for Area of lnterest 12.8 100.0%
Natural Resources
Gonservation Service
Web Soil SurveY
National Cooperative Soil SurveY
4t2312022
Page 3 of 3I.JSDAr
NRCS ABSORPTION FIETD SOITS DATA
3çSeptic Tank,Absorption Fields-Rifle Area, Colorado, Parts of Garfield and Mesa Counties(209 Cedar Breaks Road)@46'q;F 'rPslÍ!Gpt¡1;r'æ. 29' 30' NÕËÞ4t23t2022Page 1 of 539. 29'30'NgüoEa¡È-Ç*oálñãgñFñgfrñl''rï- lËü', f"!hItl1!ÆWeb Soil SurveyNational Cooperative Soii Survey261690ttIß742ô1360Natural ResourcesConservation Service261390b14n26145014€¡261510N4ap Scale: 1:1,600 if printed on A landscâpe (11" x 8.5") sheeL, Ivlet€rS0n40801æFeet050 100mæ0lvlap projection: Web ¡4ercator Comer coordinates: WGS84 Edge tics: UT¡4 Zone 13N WGS843ioNAl.:: ì .¿ffr39. 29'22" Nß14261æO261@39" æ 22" N
USDA-Natural ResourcesConservation ServiceSeptic Tank Absorption Fields-Rifle Area, Colorado, Parts of Garfield and Mesa Counties(209 Cedar Breaks Road)Web Soil SurveyNational Cooperative Soil Survey4t23t2022Page 2 of 5MAP LEGENDMAP INFORMATIONArea of lnterest (AOl)BackgroundThe soil surveys that comprise your AOI were mapped at1:24,000.Area of lnterest (AOl)Aerial PhotographySoilsSoil Rating Polygonslr Very limitedI Somewhat limitedI NotlimitedE Not rated or not avâ¡lâbleSoil Rat¡ng Lines* Verylimited' , Somewhat limitedtry, Not limitedt t Not rated or not availableSoil Rat¡ng Pointsf Very l¡mitedfl Somewhat limitedI Not limitedtr Not rated or not availãbleWater FeaturesStreams and CanalsTransportation¡.¡.¡ Railsfl lnierstate Highwaysfrdr US Routes..:.: r Major RoadsLocal RoadsWarning: Soil Map may not be valid at this scale.Enlargement of maps beyond the scale of mapping can causemisunderstanding of the detail of mapping and accuracy of soilline placement. The maps do not show the small areas ofcontrasting soils that c¡uld have been shown at a more detailedscale.Please rely on the bar scale on each map sheet for mapmeasurements.Source of Map: Natural Resources Conservation ServiceWeb Soil Survey URL:Coordinate System: Web Mercator (EPSG:3857)Maps from the Web Soil Survey are based on the Web Mercatorproiec{ion, which preserves direction and shape but distortsdistance and area. A projection that preserves area, such as theAlbers equal-area conic projection, should be used if moreaccurate calculations of distance or area are required.This product is generated from the USDA-NRCS certified data asof the version date(s) listed below.Soil Survey Area: Rifle Area, Colorado, Parts of Garfield andMesa CountiesSurvey Area Data: Version 14, Sep 2,2021Soil map units are labeled (as space allows) for map scales1:50,000 or larger.Date(s) aerial images were photographed: Aug 25, 2021-Sep5,2021The orthophoto or other base map on which the soil lines werecompiled and digitized probably differs from the backgroundimagery displayed on these maps. As a result, some minorshifting of map unit boundaries may be evident.
Septic Tank Absorption Fields-Rifle Area, Colorado, Parts of Garfield and Mesa Counties 209 Cedar Breaks Road
Septic Tank Absorption Fields
Map un¡t
symbol
Map unit name Rating Component
name (percent)
Rat¡ng reasons
(numeric
values)
Acres in AOI Percent of AOI
45 Morval-Tridell
complex, 6 to
25 percent
slopes
Very limited Morval (55%)Slow water
movement
(1.00)
4.9 38.7o/o
Slope (0.04)
Tridell(30%)Slope (1.00)
Large stones
(1.00)
67 Torriorthents-
Rock outcrop
complex,
steep
Very limited Torriorthents,
steep (60%)
Depth to bedrock
(1.00)
7.8 61.3o/o
Slope (1.00)
Totals for Area of lnterest '12.8 100.0%
Rating Acres in AOI Percent of AOI
Very limited 't2.8 100.0%
Totals for Area of lnterest 12-8 100.0%
USDAã-Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
4t23t2022
Page 3 of 5
Septic Tank Absorption Fields*Rifle Area, Colorado, Parts of Garfield and Mesa Counties 209 Cedar Breaks Road
Description
Septic tank absorption fields are areas in which effluent from a septic tank is
distributed into the soilthrough subsurface tiles or perforated pipe. Only that part
of the soil between depths o124 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 decimalfractions 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 all components, 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.
!.5q4-¿-Natural Resources
Gonservation Service
Web Soil Survey
National Cooperative Soil Survey
4t23t2022
Page 4 of 5
Septic Tank Absorption Fields-Rifle Area, Colorado, Parts of Garfield and Mesa Counties 209 Cedar Breaks Road
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 Rule; 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.
USDAz-Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
4t23t2022
Page 5 of 5
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OWTS DESIGN SPREADSHEET
1743 High Aspen Drive Single Famility ResidentialOWTS Design
Design
Flow
(GPD)
# Bedrooms
Total Design Flows
300
SITE CRITERIA
Soil Type LTAR
0.6
on Table L0.1
1
2
2A
3A
4A
3
4
5
Soil Loading Rate =
so¡l Treatment Area = STA = Des¡gn FIoøLTAR 5oo ft2
Size Adjustment Factors for Method of Application in STA
Type of Absorption
Area Method of Effluent Applcat¡on
Dosed
(siphon or Pressure
Grav¡ty PumP) Dosed
Trench X
Bed
S¡ze Ad¡ustment Factors for Types of Distribution Media in STA
Category2 Category3-
Category1- -Other Chambersor
Rock or Tire MFG Enhanced
Chips Media Media
Type of Absorption
Area
S¡ze Adiustment for Method of Application =
Size Adjustment for Type of D¡str¡but¡on =
Adjusted STA Size =350 ft2
Number of lnf¡ltrators =
Total Length of lnfiltrators =
Maximum Distribution Length =
Number of Trenches =
Number of lnfiltrators per Trench =
*Use 11 in one, 12 ¡n the other.
X
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o.7
23
115
75
2
11.5
ft
ft
2
X
@
Septic Tank Size =1000 gallons