HomeMy WebLinkAboutOWTS Engineers Reportü¿nrsËln ücun¡rY tWã'S Rrrcxr
1743 HrcH Asprrrr Dnrvr, MArru RrsrDENcE
GnnnELD CoururY, CoLoRADo
February 2023
Prepared by
Calìber lnc,
0233 County Rood 265
Rlflc, CO 81630
970.Ë25.4J44
CollbrEnglneerln g@ou tlook. com
Gnrer¡ELD Cour{TY *WTS Rmrcnr
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"l hereby affirm that this Onsite Wastewater Treatment System (OWTS) report for the Main
Residence at 1743 High Aspen Drive, 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' ß^"&g;
Licensed Professional Engineer, State of Colorado
License No
(Affix Seal)
Revleweo Bv:
TenRy Berrlortl, P.E.
Caliber Engineering Project # 2022-006.001
2
TaeLE or CcrurËNT$
1.0 lntroduction
2.0 Preliminary lnvestigation
Property lnformation
Topography
Soil Data
Location of Physical Features
Additional Information
Landscape Position
Natural and Cultural Features
Current 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
Main Residence OWTS Plan - Sheet't
Main Residence OWTS Details - Sheet 2
Floodway Boundary and Floodway Map 080205FNÐ04
NRCS Soils Map
NRCS Absorption Field Soils Data
NRCS TexturalTriangle
Caliber Engineering, lnc. Detailed Soil lnvestigation
OWTS Design Spreadsheet
Pump Design Spreadsheet
4
'1.0 [ntrsdmctiCI¡'l
At the time this report was developed the subject property
. ls classified as Vacant Land.. Comprises 35.476 acres.o Located in the High Aspen Ranch Planned Community Subdivision, Garfield County,
Colorado.
It is being proposed by the current Owner for development by constructing a six bedroom, single
family residence on the subject property.
The purpose of this reporlis 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:
. Terry Bendetti - PE/CPOW Certified Competent Technician/NAWT Certified Designer
2.û Preã!rrtãnany Imwestågatåatn
Property lnformation
Physical Address: 1743 High Aspen Drive, Glenwood Springs, Garfield County, Colorado 81601
Leoal Description: Lot 20 of the High Aspen Ranch Planned Community Subdivision, Section 25,
Township 6, Range 88. County's Account Number for the property is R006986 and the Parcel
Number is 21 8725304020.
Existinq Structures: There are no existing structures on the property
Domestic Water: There is an existing constructed well on the property. The existing well permit
No. is 274569 and:
r ls limited to fire protection, ordinary household purposes inside for not more than three
single family dwellings, irrigation of not more than one acre and watering of domestic
animals.. Limited to a maximum pumping rate of 15 gallons per minute.. Was permitted on7126212007.
Sepfrc; There are no existing septic systems on the subject property
Topography
Site Topography in the vicinity where the new OWTS STA will be located slopes from northwest
towards the southeast at an average grade of between 10 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 unit 19. NRCS soil unit
19 is Cochetopa-Antrobus Association, which has grades of between 25 to 50 percent. This data
does not agree with field observation and survey data. Survey data shows slopes between I to
12 percent, with an average between 10 lo 12 percent.
NRCS soil data indicates soil unit 19 is very limited for septic tank absorption fields due to steep
slopes and slow water movement. The slow water movement agrees with visual observation of
the two soil profile test pits.
Plotting the percentages of clay, sand and silt published by the NRCS for soil unit 34 on the USDA
Textural Triangle indicates the soil would classify as a clay loam. Clay loam soils have a
classification of type 3 or 34, both are suitable for absorption fields. The long term application
rate (LTAR) for 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.
Well Potable
Water
Supply Line
Structure with
Basement, Crawl
Space, Footing
Drains
Property
Lines
Septic
Tank
Septic Tank 502 102 5 10
Effluent Line 502 5 0 102
STA 100 252 20 10 5
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 (201 6 version)) of sufficient diameter to easily slide over and completely
encasetheconveyancemustbeused. Rigidendcapsofatleastschedule40rating(ASTMStandardD3034-16(2016
version)) must be glued or secured in a watertight fashion to the ends of the encasement pipe. A hole of suffìcient size to
accommodate the pipe must be dr¡lled in the lowest sect¡on of the r¡g¡d 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 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
a. Easements: Existing easements are shown on sheet 1
b. Floodplain Maps: According to FEMA (Federal Emergency Management Agency) the
floodplain panel for this location is 08020515008. The floodplain map for this area ¡s not
printed and the flood hazard is zone D. Flood hazard D is areas with a potentially moderate
to high risk of flooding, but the probability has not been determined.
Landscape Position
The landscape position for the STA is considered summit and the slope shape is linear - linear
(LL) towards the southeast.
6
Natural and Gultural 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"{} Detaãled Soüt frnv*stigatiæn
A detailed soil investigation to determine the depth to a limiting layer, if any, and properly classify the
soil type was conducted on May 27, 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 at the locations shown on sheet 1 and visual evaluation of both test pits
was performed under adequate light conditions, with the soil being in an unfrozen state.
Visual Evaluation
Two test pits, TP-1 and TP-2 were excavated on the subject property by the Owner's Excavator.
These test pits were used to determine soil types, if a limiting layer was present and the best
depth for the infiltrative surface. To evaluate and log the test pits, an employee from Caliber
Engineering, lnc. was on site during excavation of the pits.
Test pit TP-1 exhibited topsoil with a root zone for the first 0 to 7 inches. A single horizon between
the bottom of the topsoil zone and bottom of the pit were observed. Rocks were encountered at
a depth of 4 feet and continued to the bottom of the excavation, I feet. The volume of rock was
estimated to be 10 to 15 percent and the soil exhibited characteristics of sandy clay loam (sicl).
No limiting layer was observed, and a soil sample was collected.
Test pit TP-2 exhibited topsoil with a root zone for the first 0 to 12 inches, again with a single
horizon. Rocks were also encountered in this test pit with an estimated volume less than 35
percent. The single horizon exhibited characteristics of sicl, and no limiting layer was observed.
Excavation was terminated at a depth of 96 inches (8 feet) and a soil sample was collected.
Soil observation logs and photos are in the Appendix.
All measurements are from ground surface.
Tactile Evaluation
On 813112022, Caliber Engineering, lnc. conducted a soil textural by feel evaluation on the soil
samples collected from test pit TP-1. Results of the soil gradation revealed:
1. Total sample size = 1,000 ml.
2. Percent passing thes/o inch sieve = 100 percent.
3. Percent retained on the No. 10 sieve = 2.5 percent.
4. Soils are not type "R".
A tactile soil analysis was not conducted on the soil sample from TP-2 as visual observation of
the soils in sample TP-2 were like soils from sample TP-1.
7
Performing the soil texture by feel methodology on the non-rock portion of the sample are shown
in the following table.
*Weak < I inch; Moderate 1-2 inches; Strong > 2 inches
Results shown in the above table indicate a USDA soil classification of silty clay, soil type 4 or
44.
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 Soil
Structure
Tvpe
USDA Soil
Structure
Grade
TP-1 Blockv Moderate
According to Table 10-1 , section 43.10 of Reg 43, soil types 4 and 4A can have a blocky structure
type, but only soil type 4 can have a moderate soil structure grade. As such, the soil to receive
the effluent waste is classified as soil type 4. Soil type 4 has a LTAR of 0.20 gpd/ftz for the
application of effluent treated to treatment level 1 (TL1).
4.S Reeornrs?endetümms
An OWTS as a wastewater treatment system is suitable for this site. At a minimum, the OWTS shall
have:
. A septic tank.. Pump System in the tank.. Control Panel and Alarm.. Automatic Distribution Valve, 3 zones.. Three bed type STA.. Category 1 distribution media in the STAs.. 4" diameter influent lines.. 1-112" diameter effluent transport lines.. 1-112" diameter effluent lateral lines with 1/8-inch diameter orifices at 3.O-feet O.C
lnfluent from the residence will be conveyed through 4 inch diameter influent lines, by gravity, to a
new septic tank. From the septic tank, effluent will be pumped through transport lines to an automatic
distribution valve (ADV) having 3 zones. The ADV will distribute the effluent flow to the laterals in
each STA, in sequence determined by pump activation. The effluent will be disbursed to the STA
media through orifices drilled in the lateral piping.
The proposed residence will be a 6-bedroom single family residence. Per Table 6-1 of Reg43 the
design flow rate will be 675 gpd (gallons per day).
I
SAMPLE
Sample
Depth from
Ground
Surface (ft)
Does Soil
Form a Ball
(yes/no)
Does Soil
Form a
Ribbon
(yes/no)
*Type of Ribbon
Formed (Weak,
Moderate,
Stronq)
How Does the Soil Feel
(G ritty/Smooth/Neither)
TP-1 4.0 Yes Yes S Smooth
# Bedrooms Occupancy (# of
Persons)
Wastewater Flow per
Person Design Flow (gpd)
6 I 75 675
The OWTS STA site elevation is approximately 8,123 feet above sea level (NAVD 88) and will be
located southwest of the proposed residence. The septic tank will be installed south of the main
residence. Both locations are shown on sheet 1.
Sewer Pipe: Sewer influent pipe shall be 4-inch solid wall SDR-35 PVC installed per plans. Pipe
grades must be maintained between 2to 17 percent. Cleanouts are required:
1) Within 5 feet of the existing building.
2) At spacing not to exceed 100 feet.
3) Upslope of two or more bends closer than 10 feet.
Effluent transport pipe shall be 1-1|2-inch solid wall schedule 40 PVC pipe, installed per the plans.
STA lateral piping shall be 1-1|Z-inch schedule 40 PVC pipe having 1/8-inch diameter orifices drilled
at a spacing of 3-feet on-center. Orifices shall be drilled atthe 12 O'clock position, with everyfifth
orifice being drilled at the 6 O'clock position to allow drainage of the lateral. Flushing assemblies
shall be installed at the distal end of each lateral and be accessible from finished grade.
All piping joints shall be solvent welded, unless otherwise noted on the plans. 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. lnfluent and effluent piping shall have a minimum cover of at least
42-inches. lf the minimum cover over the pipe cannot be met, insulation must be installed per the
detail on sheet 2 until the minimum cover depth can be met.
Septic Tank: The septic tank shall be new and have a minimum capacity of 1,750 gallons. The tank
must have two bays and be on the Colorado Department of Public Health and Environment's
accepted septic tank list, found at Clean water: On-site wastewater treatment systems I Department
of Public Health & Environment (colorado.qov). 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.
The septic tank shall
1) Be located down gradient of the home.
2) Have a covering of no more than 4 feet in depth, nor less than 1 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 connection of the piping
from the residence to the tank's inlet can't be accomplished as shown on the plans, the tank can be
raised or lowered, as long as a minimum of 1.0 foot of cover, maximum of 4.0 feet, is maintained over
the tank's lid, measured from the top of the lid to surface grade. lf cover thickness becomes less than
the minimum 1.0 foot, or more than the maximum 4.0 feet, the tank can be moved closer or farther
from the residence as necessary to meet the minimum/maximum cover thickness requirements.
I
However, the tank cannot be closer than 5-feet to the residence structure. Movement of the tank
must be along the influent or effluent pipe alignments. A septic tank having a cover thickness less
than 1.0 foot or greater than 4.0 feet will not be allowed.
Access Rrsers: lnsulated, watertight access risers having lids that can be secured shall be installed
on the tank's lid. There shall be two 24" diameter risers, one installed over each access opening.
Pump: The pump shall be a high head pump capable of pumping 50 gallons per minute at a total
dynamic head of 47ieet. lt is recommended that Orenco's PF-5007 high head pump be utilized, but
other pumps having equal characteristics may be utilized.
Ftoat Assembly: The pump shall be activated/deactivated by a float assembly having an "on" float,
arì "off'float and an "alarm" float. The float assembly shall be installed on a float tree.
The float switch assembly will be connected to the alarm system using an external splice box. lt is
recommended that Orenco's External Simplex Splice Box be used. Other manufacturers of equal
specifications may be used.
Control/Alarm Svstem: lt is recommended that Orenco's Simplex Panel be installed. Other
control/alarm boxes may be utilized as long as it is "equal" in performance and operation, in addition
to being approved by the Engineer prior to purchase.
Automatic Distribution Valve (ADVI lt is recommended that Orenco's ADV model V6403A be
installed. Other ADVs may be used, but they must be considered "equal" in performance and
operation, in addition to being approved by the Engineer prior to purchase.
Soil Treatment Area (STA): The soil treatment area was sized using criteria found in section 43.10
of Reg43 for a 6-bedroom residential home using:
. Beds for the soil treatment area.. Effluent application by pressure distribution.. Gravel for the distribution media.
The following table summarizes sizing of the STA
*Tonnage is based on 125lbs./cf with the depth of gravel being 1 .0 foot.
The STA shall be excavated as field conditions require using the following guidelines
1. Three beds.
2. Beds shall be no wider than 12 feet.
3. Bed lengths shall be a minimum of 93.75 feet.
4. A minimum of 6-feet, measured sidewall to sidewall, shall separate beds
5. The infiltrative surface shall be no greater than 4-feet from the surface.
6. Bed floors shall be level and set at the infiltrative surface.
No.
Bedrooms
Daily
Design
Flow (qpd)
LTAR
Method of
Application
Adiustment Factor
Distribution Media
Adjustment
Factor
STA
Size
(sf)
*Gravel (tons)
6 675 o.20 1.0 1.0 3,375 211
10
7 . Laterals shall be placed with orifices in the 12 O'clock position with every fifth orifice placed
in the 6 O'clock position.
The STA shall have a final soil cover as described on sheet 2. 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 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.
6.t tmsåattaÉiæn tbs*nr*Ëåons
lnstallation observations by the Design Engineer and lnspector for Garfield County's Public Health
Department must be made for:
. Cleanouts.. Risers installed on the tank lid.. lnleVoutletconnections.. lnstallation of the pump, floats, control panel, splice box, and discharge assembly in the tank.. lnstallation of the transport line to the ADV.. lnstallation of the ADV.o lnstallation of the distribution laterals.
lnstallation of these features should be substantially complete and ready to be backfilled prior to
requesting individual or simultaneous observation inspections for these features. Backfill can be
completed upon approval by the Garfield County Public Health Department.
ln addition, operation of the pressurized system must be observed by the Design Engineer prior
to covering the distribution laterals.
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 and operation of the distribution laterals.
6.0 Gpenmtåwrt ms"*d FnmvsntãÊåve ãVlaåsçËenanÕe SÇä,tedu[e
The goal of an operation and maintenance schedule is to observe the operation, and perform minor
maintenance to the OWTS to allow for proper, long-term functioning of the system.
General: System users must realize that an on-site wastewater treatment system is different from a
public sewer service. An OWTS cannot handle plastics or other non-biodegradable material.
ln addition, 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. Water use discharged to the STA should not be from sources generated from:
. Toilets running constantly; damaged seals should be repaired immediately to prevent excess
flows from discharging to the STA.. Leaving water running to prevent water lines from freezing.. Swimming pool or spa water.
11
Discharging flows generated from sources like these could cause excessive daily loading and
irreparable harm to the STA.
Caliber Engineering, lnc. 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 for the backwash waste.
No landscaping or plastic can be used over the STA, which would reduce the performance of the
STA.
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.
Effluent Filter. The effluent filter at the pump shall be cleaned (hosed off) at the time of pumping or
as needed.
Flushinq of Laterals: Laterals shall be flushed as needed to ensure lateral piping and orifices are not
plugged.
7.ü Ë-imfitat*ons
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 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 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.
12
Appex"rdix
Main Residence OWTS Plan - Sheet I
Main Residence OWTS Details - Sheet2
Floodway Boundary and Floodway Map 080205FND04
NRCS Soils Map
NRCS Absorption Field Soils Data
NRCS Textural Triangle
Galiber Engineering, lnc. Detailed Soil lnvestigation
OWTS Design Spreadsheet
Pump Design Spreadsheet
13
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Floodway Boundary
and Floodway Map
080205FND0A
MAP NUMBER
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MAP INDEX
PÂNELS PHMTED: 955, 984, S05, 1015,
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1855, 1856, 1857, 1858, 1859, 1870,
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NRCS Soils Map
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So¡l MâÞ-Aspen-Gypsum Area, Colorado, Parts of Eagle, Garfield, and P¡tk¡n Count¡es
(1743 High Aspen Dr¡ve)
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HE Natural Resources
Conseryation Seryice
Web So¡l Survey
National Cooperative Soil Suryey
5k8no22
Page 1 of 3
Ë&Natural Resources
Conseruation Serylce
Soil MaÈ-Aspen-Gypsum Area, Colorado, Pãrts of Eagle, Gârfield, and Pitk¡n Counties
(1743 H¡gh AsPen Drive)
Web Soil Suruey
National Cooperative Soil Suruey
5t18t2022
Page 2 of 3
MAP LEGEND MAP INFORMATION
The soil surueys that comprise your AOI were mapped at
'l:24,OOO.
Waming: Soil Mêp may nol be valid at this scale.
Enlargement of maps beyond the scale of mapping can cause
misunderstanding of the detail of mappìng and accuracy of soil
l¡ne placement. The maps do not show the small areâs of
contrast¡ng so¡ls that could have been shown at a more detailed
scale.
Pleâse rely on the bâÍ scåle on eâch map sheet for map
measutements.
Source of Map: Natura¡ Resources Conseruãtion Seru¡ce
Web So¡¡ Survey URL:
Coord¡nate System: Web MerÉtor (EPSG:3857)
l\4aps from the Web So¡l Survey are based on the Web lvlercator
projection, which preserues direction ând shãpe but distorts
distance and area. A prcject¡on that preserues area, such âs the
Albers equal-area con¡c prcjection, should be used if more
âccurate mlculãtions of distânce or areâ âre required.
Thìs product ¡s generated from the USÞA-NRcS ærtified data as
of the version date(s) listed below.
Soil Suruey Area: Aspen-Gypsum Area, Colorado, Parts of
Eagle, Garfield, ând Pitk¡n Count¡es
Suruey Area Data: Vers¡on 12, Sep 2, 2021
Soil map units are labeled (as space allows) for map sæles
1:50,000 or larger
Date(s) aer¡al ¡mageswerephotographed: Aug 25, 2021-Sep
5,2021
The orthophoto or other bãse map on which the soil l¡nes were
compiled and dig¡tized probably differs from the bâckground
¡magery displayed on these maps. As a result, some minor
shift¡ng of map unit boundar¡es may be ev¡dent.
Area ol lnterêst (AOl)
I i Arêâ oflnleresl (AOl)
So¡ls
lf so¡l Mâp un¡t Polygons
4¡ Soil Map Unil L¡nes
I I so¡lMaP Unit Poinls
spec¡al Polnt Fê¡tures
Blowout
Borrow Pit
Clay Spot
closed Depress¡on
cravel Pit
Gravelly Spot
Landfill
Lava Flow
Marsh or swamp
Mine or Quarry
Miscellâneous Water
Perenniâl Wâter
Rock Outcrop
saline Spot
Sandy Spot
Seve¡ely Eroded Spol
Sinkhole
Sl¡de or Slip
Sod¡c Spot
tt SpoilArea
ü StonySpot
* very stony spot
V Wet Spot
& Olher
,/ Spec¡al Line Feâturês
Water Features
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{4Ø Major Roads
e9 Local Roads
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Soil Map-Aspen-Gypsum Area, Colorado, Parts of Eagle, Garfield, and Pitkin Counties 1743 High Aspen Drive
Map Unit Legend
19 Cochetopa-Antrobus
association, 25 to 50 percent
slopes
33.5 99.5%
64 Jerry loam, 25 to 65 percent
slopes
0.2 0.5o/o
Totals for Area of lnterest 33.7 100.0%
TJSDAr Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
5t18t2022
Page 3 of 3
NRCS Absorption Field
Soils Data
=
ä
R
R
Sept¡c Tank Absorption FieldtsAspen-Gypsum Area, Colorado, Pârls of Eagle, Garfield, and P¡tk¡n Count¡es
(1 743 High Aspen Dr¡ve)
31m 31m 33fm 313tm
31M 3lM 3131m 3131æ 31Ø 3eæ
Map S.del 112,620 if printed on A landspe (11" x 8.5') shd.
70 140
01m2m1ûm
lvap pþjedionr Uftb Mffi b Coffi @¡dimE: WGS84 Edge bct UTt4 Zone 13N WG584
Conservat¡on Sery¡ce
Web So¡l Survey
National Cooperative Soil Suruey
v Ð9N
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31M 31W
TJSDAY 511812022
Page I of 5
I-EDAzn Conseryation Seryice
Septic Tank Absorption F¡eldFAspen-Gypsum Area, Colorado, Parts of Eagle, Garf¡eld, and Pitkin Counties
('1743 High Aspen Drive)
Web Soil Suruey
Nat¡onal Cooperative Soil Suryey
511812022
Page 2 of 5
MAP LEGEND MAP INFORMATION
Areâ of lnterest (AOl)
i,-.,: Area of lnlerest (Aol)
So¡ls
soil Rating Polygons
I Very l¡mited
f] Somewhat limited
ill Not limited
Background The soil surueys that comprise your AOI were mapped at
'1:24,000.Aerial Photography
W¿rning: So¡l Mâp may not be valid at this scale.
Enlargement of maps beyond the sæle of mapping can cause
m¡sunderstanding of the deta¡l of mapp¡ng and accuracy of soil
l¡ne placement. The maps do not show the small areas of
contrast¡ng so¡ls that could have been shown at a more deta¡led
scale.
Soil Rating L¡nes
# Very limited
t t Somewhat l¡mited
¿4/, Not limited
4.* Not râted or nol available
Soil Rating Polnts
I Very l¡m¡ted
Please rely on the bar scale on each map sheet for map
measurements-
Somewhat l¡mited
Not limÌted
Source of lvap: Natural Resources Conseruation Sery¡ce
Web Soil Suruey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Suruey are based on the Web l\4ercator
prcjection, which preserves direct¡on and shape but distorts
d¡stânce and area. A prcject¡on that preserues area, such as the
Albers equal-area con¡c project¡on, should be used ¡f more
aæurale ælculat¡ons of distance or area are ¡equìred.
Th¡s product ¡s generated from the USDA-NRCS cert¡f¡ed data as
of the version date(s) listed below.
Soil Suruey Area: Aspen-Gypsum Area, Colorado, Parts of
Eagle, Garf¡eld, and P¡tk¡n Counties
Suryey Area Data: Version 12, Sep 2,2021
Soll map units ãre labeled (as space allows)for map sæles
1:50,000 or larger.
Date(s) aer¡al images were photographed: Aug 25, 2021-Sep
5,2021
The orthophoto or other base map on which the soil l¡nes were
comp¡led and digitized probably differs from the bâckground
imagery d¡splayed on these maps. As a result, some m¡nor
shift¡ng of map un¡t boundar¡es may be evidênt.
@ Not rated or not available
Water Features
ì-.r' Streams and Canals
Transportation
t |+| Râ¡ls
a*i lntefststeHighways
ñ, US Routes
N. l\,lajor Roads
@d Local Roads
Septic Tank Absorption Fields-Aspen-Gypsum Area, Colorado, Parts of Eagle, Garfield, and
Pitkin Counties
1743 High Aspen Drive
Septic Tank Absorption Fields
Slope (1.00)Cochetopa
(45o/o)
Slowwater
movement
(1.00)
Sfope (1.00)
Large stones
(1.00)
19 Cochetopa-
Antrobus
association,
25 to 50
percent sfopes
Very limited
Antrobus (40%)
Slow water
movement
(0.72)
33.5 99.5%
Slope (1.00)64 Jerry loam, 25 to
65 percent
slopes
Very limited Jerry (85%)
Slow water
movement
(1.00)
o.2 0.5o/o
Totals for Area of lnterest 33.7 100.0%
Very limited 33.7 100.0%
Totals for Area of lnterest 33.7 100.0%
USDAn Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
5t18t2022
Page 3 of 5
Septic Tank Absorption Fields-Aspen-Gypsum Area, Colorado, Parts of Eagle, Garfield, and
Pitkin Counties
1743 High Aspen Dr¡ve
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 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.
USDAn Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
5t1812022
Page 4 of 5
Septic Tank Absorption Fields-Aspen-Gypsum Area, Colorado, Parts of Eagle, Garfield, and
Pitkin Counties
1743 High Aspen Drive
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 criticalfactor 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.
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
5t18t2022USDA¡n Page 5 of 5
NRCS Textural Triangl.
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OWTS Design
Spreadsheet
1743 High Aspen Drive Main Residence Single Family Residential (
Design
Flow
(GPD)
675# Bedrooms
Total Design Flows
SITE CRITERIA
SoilType
Soil Loading Rate =
Soil Treatment Area = STA = Design Flow/LTAR
Size Adjustment Factors for Method of Application in STA
Type of Absorption
Area
675 spd
Type of Absorption
Area
Size Adjustment for Method of Application =
Size Adjustment for Type of Distribution =
Adjusted STA Size =
tTAR
Q.2
0.20 Based on Table 10.L
3375 ftz
Method of Effluent Applcation
Dosed
(siphon or Pressure
Gravity pump) Dosed
X
Category2 Category3-
Categoryl- -Other Chambersor
Rock or Tire MFG Enhanced
Chips Media Media
3375 ft2
t
2
2A
3
3A
4
4A
5
Trench
Size Adjustment Factors for Types of Distribution Media in STA
Bed
X
1
L
6
x
Septic Tank Size =L750 gallons
Pump Selection for a Pressurized System - Single Family Residence Project
Harki ns-MainResidence
Parameters
1.50
30
40
1_50
4403
69
40
1.50
10.6
12
40
1.50
I
89.8
40
1.50
1t8
5
None
0
Calculations
Discharge Assembly Size
Transport Length Before Valve
Transport Pipe Class
Transport Line Size
Distribut¡ng Valve Model
Transport Length After Valve
Transport Pipe Class
Transport Pipe Size
Max Elevation Lift
Manifold Length
Manifold Pipe Class
Manifold Pipe Size
Number of Laterals per Cell
Lateral Length
Lateral Pipe Class
Lateral Pipe Size
Orifice Size
Orifice Spâcing
Residual Head
Flow Meter
'Add-on' Friction Losses
inches
feet
¡nches
feet
inches
feet
feet
inches
feet
¡nches
inches
feet
feet
inches
feêt
ool¡.
c¡þ
tt(û{,
o
ÈoÊ
c¡
Ë
.o
160
140
120
100
80
60
40
20
Minimum Flow Rate per Orifice
Number of Orifices per Zone
Total Flow Rate per Zone
Number of Laterals per Zone
% FIow Differential lsvLast Orifice
Transport Velocity Before Valve
Transport Velocity After Valve
Frictional Head Losses
0.43
90
39.3
ó
3.3
o.¿
6.2
gpm
gpm
o/o
fps
fps
00
feet
feet
feet
feet
feet
feet
feet
feet
gals
gâls
gals
gals
gals
gals
Loss through Discharge
Loss in Transport Before Valve
Loss through Valve
Loss in Transport after Valve
Loss in Manifold
Loss ¡n Laterals
Loss through Flowmeter
'Add-on' Friction Losses
Pipe Volumes
4.6
2.6
17.4
5.9
0.3
o.4
0.0
0.0
10 20 30 40 50
Net Discharge (Spm)
60 70 80
PumpData
PF5007 High Head Effluent Pump
50 GPM, 3/4HP
230V 1Ø 60Hz.20012301460Y 3Ø 60HzVol of Transport Line Before Valve
Vol of Transport Line After Valve
Vol of Mân¡fold
Vol of Laterals per Zone
Total Vol Before Valve
Total Vol After Valve
lquiremênts
3.2
7.3
1.3
28.5
3.2
37.1
gpm
System Curve: -
Pump Curve: *
Pump (Jptrmal Kange:
&
Operating Point: V
0
Design Point:
âôt
46.8 feet