HomeMy WebLinkAboutOWTS Engineer's ReportGnnnELD CouNrY OWTS RePonr
33 MNBLE LNNE
StLr, CO 81652
GnnnELD CouNrv, CotoRADo
August 2022
Prepared by
SSGM
I l8 WEST Srxrn SrneET, SutrE 2OO
GueNwooo SPRTNGS, CO A l60 I
970.945.1OO4
97O.945.5948 FAX
GnnTIELD CouNTY OWTS Rrponr
33 MnBLE Lnrur
Gnnr¡ELD Courury, CoroRADo
"l hereby affirm that this Onsite Wastewater Treatment System (OWTS) report for Paulson
Residence 33 Mable Lane, 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."
Chad Alan Paulson, P.E
License No.
Licensed Professional Engineer, State of Colorado
PnrpnReo Bv:
CHno PRulsotl, P.E.
2
Tnelr or CoTTENTS
1.0 lntroduction
2.0 Preliminary lnvestigation
2.1 Property lnformation
2.2 Topography
2.3 Soil Data
2.4 Location of Physical Features
2.5 Additionallnformation
2.6 Landscape Position
2.7 Natural and Gultural Features
2.8 Current and Historic Land Use
3.0 Detailed Soil lnvestigation
3.1 Visual Evaluation
3.2 Tactile Evaluation
4.0 Recommendations
5.0 lnstallation Observations
6.0 Operation and Preventative Maintenance Schedule
7.0 Limitations
5
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6
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6
7
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3
Apprrrrntx
Project Plan Set
SGM design calculations
NRCS Soils Map
NRCS Absorption Field Soils Data
NRCS Textural Triangle
SGM Soil Observation Logs
SGM Soil Texture by Feel
OWTS Design Spreadsheet
FEMA FIRM Panel 08037CO488D
4
l.0lntroductian
The subject property is an existing residence. Data obtained from Garfield County records
indicates the existing septic system was approved and constructed in 2003. Original design was
based on a 12 MPI perc rate, constructed with a two-compartment, 12S0-gallon septic tank and
infiltrator chambers in the soil treatment area.
System backups began ln March 2023. Upon inspection after tank pumping, standing water was
found inside the infiltrators with very slow infiltration rate. A heavy biological mat was found on the
exterior of the infiltrators, and presumably on the bottom also due to the extreme low infiltration rate
The soils immediately outside the mat are dry with no other visual sign of impediment.
As a consequence of the failure, a leach filed replacement design following Garfield County
requirements is detailed in the following. The home now has 4 bedrooms, of which only three are
used as full-time bedrooms with the fourth serving as an office area. Design will be based on 4 full
bedrooms in accordance with Garfield County regulations. This report presents reconnaissance
information and design to meet the requirements for an onsite wastewater treatment system (OWTS)
as required by the County's Regulation a3 (Reg a3).
SGM personnel contributing to this report are:. Jeff Simonson - PE/CPOW Certified Competent Technician/NAwT Certified Designer. Chad Paulson - PE
2.0 Preliminary lnvestigation
2.1 Property Information
Phvsical Address: 33 Mable Lane, unincorporated Garfield County, Colorado.
Leqal Description: Tract 394, Antlers Orchard Subdivision, Garfield County, Colorado
Existinq Structures: The existing residence is served by the original OWTS permitted by the
County.
Septic: A replacement OWTS leach field is being constructed to serve the residence.
2.2Topography
Topography in the vicinity of the new OWTS slopes from southeast to northwest at a grades
betweenlto6percent.
2.3 Soil Data
According to the Web Soil Survey for the Natural Resources Conservation Service (NRCS) soils
associated with the subject property are classified as map unit 541566. NRCS soil unit 54/56 is
Potts Loam, which has grades between 1to 12 percent. The subject site matches both the NRCS
soil description and stated surface slope.
NRCS soil data indicates Potts Loam is listed as suitable for septic tank absorption fields due to
good movement of water. This agrees with field observations and previous design parameters.
5
Visual observation in excavated test pits indicates the soils are sandy loam, consistent with the
NRCS reports.
Plotting the percentages of clay, sand and silt published by the NRCS for this soil unit on the
USDA Textural Triangle indicates the soils would classify as sandy loam, soil type 24. Physical
observation and percolation tests support classification as soil Type 2A. Type 2A soil is suitable
for absorption fields with longterm application rate (LTAR) of 0.50 gallons per day per square
foot of area (gpd/ft2).
Percolation tests were conducted in the proposed STA as an additional aid for soil classification.
Tests were conducted by wetting for 48 hours, then conducting a standard two-hour level test.
The results indicate a maximum percolation rates of 20.0 and 22.9 minutes per inch, respectively,
in the two test holes. According to Table 10-1, section 43.10 of Reg43, these rates are below the
low end of the range listed for soil type 2A. Design around Type 2A soil is consequently
supported.
2.4 Location of Physical Features
Physical features on the subject property are sited in excess of the required minimum horizontal
setbacks shown in the following Table. All distances are in feet.
Structure with
Basement,
Crawl Space,
Footin -Dtgils
Septic Tank 5 10
Effluent Line 5
STA 20 25 10
2.5 Additional Information
a. Easements: Ïhere are no existing easements on site that are relevant to the installation of
this OWTS.
b, Floodplain Maps: According to FEMA (Federal Emergency Management Agency) the
subject property is not in a flood hazard zone. FEMA map included in Appendix.
2.6 Landscape Position
ïhe landscape position for the STA is considered shoulder. The slope shape is linear Convex-
linear (LV) towards the northwest.
2.7 Natural and Gultural Features
No natural or cultural features were identified in the site reconnaissance.
2.8 Current and Historic Land Use
The subject property is within a developed, platted subdivision in unincorporated Garfield County
The site was developed in 2003with residential home.
Potable Water
Supply Line
6
10
Proposed
Septic
Tank
3.û üetailed $oil lnvestigaticn
A detailed soil investigation to determine the depth to the limiting layer, if any, and properly classify
the soil type was conducted on April 29, 2023. Visual evaluation of two soil profile test pits was
conducted in the field and samples collected from each test pit. The soil texture by feel method was
utilized in the field to classify the soil type that will receive wastewater effluent. Percolation tests were
also conducted. See appendix for full report.
The soil investigation concluded the onsite soils in the STA correspond with Type 2A soils
4.0 Recornmendations
The proposed STA will replace the existing field. Design follows Garfield County Public Health
Agency On-Site Wastewater Treatment System Regulations. The STA design is for flow of 525
GPD applied to Type 2A soils with LTAR of 0.50.
Sewer influent/effluent pipe shall be 4-inch Schedule 40 PVC installed per plans but may be adjusted
in the field as field conditions warrant. The minimum grade for the piping shall be 2o/o and the
maximum grade 30%, Joints shall be solvent welded.
lnspection ports should be provided at both ends of every run, as detailed in the design plans
A distribution box should be installed,
All 9O-degree direction changes shall be constructed using two, 45 degree fittings. The pipe shall be
properly bedded per the typical trench detail presented on plan sheets.
Bed/trench bottom shall be level. Beds and trenches shall be spaced 6 feet apart. Grading over
chambers may vary from 30 to 44 inches.
Soil Treatment Area (STA,): The soil treatment area was sized using criteria found in Garfield County
Public Health Agency On-Site Wastewater Treatment System Regulations. Design is based on 4
bedrooms, which per Garfield County is assigned as 7 persons at 75 GPD each, equating to 525
GPD, The unadjusted treatment area is 1050 SF.
The following table summarizes design sizing of the STA with use of infiltrator chambers.
The STA shall be excavated/installed as field conditions require using one of the following
configuration options. Final configuration option will be determined in the field by Engineer and
contractor based on the construction option that best serves the site.
7
Residential
Wastewater
Description
Number
of
persons
GPDC
Daily
Design
Flow (gpd)
LTAR STA
type
Method of
Application
Adjustment
Factor
Distribution
Media
Adjustment
Factor
STA
Size (sf)
4 bedrooms 7 75 525 0.50 bed 1.2 0.7 882
trench 1.0 0.7 735
68
65
:
overallbed size
27 x77 ft,
36 x 59 ft:
I
unit/bed :total
40:
aovv
areq overallbed size
888i 27 x72ft,
882,36x59ft,
row//bed unit trmt
4
3
1
1
0
3
80
78
The surface of the STA shall be seeded with native dryland mix after installation of the system. No
automatic sprinkler system shall be installed over the STA. Vehicular traffic and livestock shall be
kept off of the STA. No landscaping, impervious surfaces or plastic sheeting can be installed over
the STA that will reduce performance of the STA.
5.0 I nstallation Observations
lnstallation of the septic tank, effluent lines, dosing tank and infiltrators shall be observed by the
design engineer or his/her representative. These features shall be set at final location/elevation and
ready for final backfill prior to SGM personnel showing up on site to conduct these inspections.
Scheduling shall occur at least three days in advance by calling 970-945-1004 and requesting to be
connected to the project manager, Chad Paulson.
6.0 Operation and Preventative Maintenance Schedule
The goal of an operation and maintenance schedule is to observe 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.
Effluent Filter. lf installed, 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 ffows is recommended. Excessive daily
loading could flood and irreparably harm the STA.
SGM recommends against installation of a water softener. The chemical and hydraulic loading from
the backwash of a water softener would be damaging to the STA, so if a softener is installed, a
separate drywell shall be constructed for the backwash waste. No landscaping or plastic can be used
over the STA, which would reduce the performance of the STA. The design of the OWTS is based
on the treatment of domestic sewage only. 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.
I
7.0 Limitations
Our investigation, layout, design, and recommendations are based on site visits and the best
information available at the time. The contents of this letter shall not serve as the basis for any third-
party engineering design. lf conditions that are considerably different from those described in this
report are encountered, SGM shall be called to evaluate the conditions. lf the proposed construction
is changed, SGM shall be notified to evaluate the effect of the changes on the OWTS prior to the
changes being made. All construction shall be in accordance with the Garfield County OWTS
Regulations. Pipe type and size, burial requirements, septic tank construction, and other
specifications, which are not depicted in our report, shall conform to the requirements of the County's
OWTS Regulations. The installer of the system shall be acceptable by the County's Environmental
Health Department.
I
PROJECT:SGM NO.:DATE:PREPARED BY:PURPOSE:GIVENASSUMPTIONS /KNOWNCONDITIONS:LEGEND:I. DESIGN FLOWS2. MINIMUM SEPTIC TANK CAPACITYreq'd 48-hr det.useGarfield County Dept. of Public HealthOWTS Checklist Design CalculationsPaulson STA Replacement - 33 Mable Lane201 8-528.00514-Jun-22Chad Paulson, PEDesign calculations for the sizing of septic system tank.1. Colorado Water Quality Control Commission (CWQCC) Regulation 43, Onsite Wastewater Treatment Systems Regulat¡on2. Garfield County Publ¡c Health Agency On-site Wastewater Treatment System Regulations1. 4 bedrooms2. Minimum septic tank capacity (gal)3. Minimum set-back d¡stances (LF) for OWTS4. Septic tank design5. Soil treatment area design6. Per Garfield County regulations, 4 bedroom = 7 people @ 75 cPDGiven value orCãlculatêd vamin tank size for non-residential =common supply s¡zetank for this in order to ensure m¡n. 1-ft freeboard at 48-hr detention time.12504Each Addit¡onal1,050 lqallons1.250 loallons'Septic Tank Calculations
Garfield County Dept. of Public HealthOWTS Checklist Design Calculations3. TREATMENT LEVELS4. SEPTIC TANK DESIGN CRITERIANo. tank compartments =M¡n. volume of first compartment =Min. distance from inlet to outlet invert =Min. distance from outlet invert to tank top =Min. liquid depth =Max. liquid dePth =Min. liquid surface area =M¡n. distance from inlet(s) to outlet(s) =Min. detention time =5. SEPTIC TANK DESIGN CALCULATIONS12Check capacitv aoainst min, detention time and freeboard(1) Assume min. freeboard desired =(2) Min. volume to store for 48-hr detention time =Excess volume @ 48-hr detention =Freeboard @ 48-hr detentiôn time =Seotíc Tank Capacitvmtntmumgalinin(Reg 43.9.8.4.a)(Reg 43.9.8.4.a)(Reg 43.9.8-4.b)(Reg 43.9.8.4.e)(Rêg 43.9.8.4.f)(Res 43.9.B.a.f)(Res a3.e.F.a.i)(Reg 43.9.8.4.i)(Reg.43.9.1.3)ftCF=in=ftgal200 gal26.74 CF7.4805 gallft0.66 ftlcalc d from capac¡ty, actual 12' by constructionl0.790.130130.050.0518029.4117647129.4117647111 76'47o.58,e11.76470588'l!25112N33NNOTES:l Calculated assuming CBOD. is approx. equal to 85% of BOD'.2 Calculated daily loadinq based on desiqn flow above.2833.3315507.3187.765489677.94.33482317,51491 4.08333491 4.083331,070.97533.88143.1771.45.335,3326.845.50014.881a1aa5 50012.431#1#2NOTES:1. Tank dimensions taken from Valley Precast (1000T-3CP) 1000 Gallon Three Compartment2. Net capacity for each compartment per Valley Precast cutsheet.TotalSeptic Tank Calculations
PROJECT:SGM NO.:DATE:PREPARED BY:Paulson Residence5-May-23Chad Paulson, PEGIVENAdiustment Factors Tables 10-2 and 10-3bed, pump or siphonmedia - rocktrench, gravitytrench, Chamberbed, gravitybedchamberBed DesiqnGarfield County Dept. of Environmental HealthOWTS Design Calculations1.Q0.7Pk Flow 787.5 SpdTable 10-1,43.10pressure dosed with siphon and headnative soils, bedif chambers are also used in bed, ie. not pressure dosed78.00 # of infiltrators required for bed9.75 units per row10.00 actual units per row, per bed40.00 units per bed45.00 overall actual field lengthstorged liquid volume 43.00 gal/unitvolume stored in field 3,440.00total units all beds = 80.00PURPOSE:Design calculations for the sizing of soil treatment area.'l . Colorado Water Quality Control Commission (CWOCC) Regulation 43, Onsite Wastewater Treatment Systems Regulation2. Garfield County Public Health Agency On-site Wastewater Treatment System Regulations3. LTAR = 0.5 based on soil analysi = Soil Type 2A1. SOIL TREATMENT AREA DESIGNSoilTreannent Area (SF) =Design Flow (gpd.)LIAR e!#)Design flow =LTAR =525 oodI o.solqod/SF43.10.C.4:designBed width, max. (W) =Bed separation distance, min. (s) =Number of beds (n) =Bed length, (L) Design flow =.,.¡ìl1.20.7trench bed12 ft (Reg. 43.10.F.2)6 ft (Reg. 43.10.F.2) clear between walls236.75 ft *max length 100 ft (this is treatment area only)37.00888.00 SF of proposed bed areaOptionI6249.0049.00882.0077.0012.8313.0039.0058.503,354.0078.00Area Calculated =SF1882 SFTreatment Area735NTreatment Area Calculations
2. CHAMBER DESIGNDesiqn CriteriaGarfield County Dept. of Environmental HealthOWTS Design CalculationsDesign Manufacturer = lnfiltrator Water TechnologiesDesign Model = Quick4 Standard SeriesWidth = 34 inLength = 53 inHeight = 12 in(1) Can be installed in 36" wide trench treatment length(2) Effective length = 48 in 4 ft(3) Storage CaPacity = 43 gal(4) lnvert height (lateral within chamber) = I in(5) Louver Height = I inTotal # Chambers :Req'd Soil Treatment Area (SF)Ef fectíveChamber Length * Chamber WtdthSurface area per chamber =1632 sq. in. / chamber11.3333333 SF / chambertotal chamber length4.5Min. no. chambers needed (design flow¡ =Number of rows/laterals =Chambersrow =treatment area each trench =68.Total overall actual length of each trench =cl-cl width @ 9 ft separation65.00 chambers41777ft27ft77'l SF trmt area43.00 gal/unit2,924.00 gal storedtrench optionsrowsbed options# of bedslength of 100 ftaltemate option5l365.00 chambers52.00 ft59 ft36 ft736.67 SF trmt area43.00 gal/unit2,795.00 gal storedstorged liquid volumevolume stored in fieldunit/row total units trmt area overall bed size17 68 771 27 x77 ft13 65 737 36x59ftbed width rod/bed unit/row univbed total unit trmt area overall bed size2 12 4 10 40 B0 888 27 x72ft2 I 3 13 39 TB gg2 36x59ft45Total no.Treatment Area Calculations
BASED ON REGULATION 43 TABLE 1O-1
For Soils with Less Than 35 Percent Rock Fragments. Rock Fragments are larger than 2 millimeters.
Soil Treatment Area long Term Acceptance Rates by Soil Texture, Soil Structure, Percolation Rates and Treatment Level
Soil Type, Texture, Structure and Percolation Rate Range
Long-term Acceptance Rate (LTAR)
Gallons per day per square foot
USDA Soil Texture
Sand
Loamy Sand
USDA Soil
Structure-
Type
Single Grain
USDA Soil
Structure-Grade
Structureless
Percolation
Rate (MPl)
5-15
Treatment Treatment
Level 11 Level 21
0.80 1.40
Treatment
Level 2N1
Tteatment
Level 31
Treatment
Level 3N1*
L.40 1.55 1.55
Sandy Loam
Loam
S¡lt Loam
Prismatic
Blocky
Gran ula r
Moderate
Strong 76-25 0.60 1.00 1.00 1.10 1.10
Sandy Loam
Loam
Silt Loam
Prismat¡c
Blocky
Granular
Weak
26-40 0.s0 0.80 0.80 0.90 0.90
Massive Structureless
Sandy Clay Loam
Clay Loam
silty Clay Loam
Sandy Clay Loam
Clay Loam
Silty Clay Loam
Prismatic
Blocky
Granular
Prismatic
Blocky
Granular
Moderate
Strong
Weak
41,-60
61-75
0.35 0.5s
0.30 0.45
0.55 0.65 0.65
0.45 0.5s 0.55
Massive Structureless
4
Sandy Clay
Clãy
Silty Clay
Prismatic
Blocky
G ra nular
Moderate
Strong 76-90 0.20 0.30 0.30 0.30 0.30
4A
Sandy Clay
CIay
Silty Clay
Prismât¡c
Blocky
Granular
Weak
9L-120 0.15 0.20 0.20 0.20 0.20
Massive Structureless
5 Soil Types 2-44 Platy
Weak
Moderate
Strong
721'+0.10 0.15 0.15 0.15 0.15
SoilType
1
2
2A
3
3A
tl
Treatment levels are defined in Table 6.3
Areas outside the dashed box require design by a professional engineer
100
10Textural
Triangle
90
10
100 90 80
20
50 40
80
30
So¡l Type I or lA
5o¡l Type 2 or 2A
5olllypel
5oll Type4 or 4A
20
^q
^\
QO
50
60
40
NRCii Í*oil prr:filer
r:l a:;i; if i c¿rtion r;ln g e,
ï'y¡;c+ 2A
5andy Clay
Loam
rcent Sand
20 10
100
43.10 Design Criteria - So/ Treatment Area
Table 10-l Soil Treatment Area Long-term Acceptance Rates by Soil Texture, Soil Structure,
Percolation Rate and Treatment Level
Long-term Acceptance Rate (LTAR);
Gallons per day per square footSoil Type, Texture, Structure and Percolation Rate Range
USDA Soil
Structure-
Grade
Percolatio
n Rate
(MPr)
Treatment
Level 1r
Treatment
Level 21
Treatment
Level 2N1
Treatment
Level 3r
Treatment
Level 3N1*
Soil
Type USDA Soil Texture
USDA Soil
Structure-
TyPe
>35% Rock (>2mm): See Table 10-14R>35% Rock (>2mm): See Table 10-14
-Y-o".eo1-0
lsfùlírìGèf r{4k^.'Sinole\r^Gfãñr-\r-T*k*q"xt*P-V^t-\1.40
t-
'l.40 1.55 1.55
PR
(Prismatic)
BK
(Blocky)
GR
(Granular)
2 (Moderate)
3 (Strong)16-25 0.60 1.0 1.0 1.',1 1.12Sandy Loam, Loam, Silt
Loam
JJJ-
26-40
À_À_À_-)
0.50 0.80
I
0.80 0.90 0.90
À*_À--
2A Sandy Loam, Loam, Silt
Loam
Massive
*-REj6,\
GR
(Structureless)
,r--^t!he!L--t
0
0.55 0.55 0.65 0.65Sandy Clay Loam, Clay
Loam, Silty Clay Loam GR
PR, BK,2,3 41-60 0.353
0.55
Massive
GR
PR, BK,
(Structureless)
1
0 61-75 0.30 0.45 0.45 0.553ASandy Clay Loam, Clay
Loam, Silty Clay Loam
2.3 76-90 0.20 0.30 0.30 0.30 0.304Sandy Clay, Clay, Silty
Clay
PR. BK,
GR
91-120 0.15 0.20 0.20 0.20 0.204ASandy Clay, Clay, Silty
Clay
Massive
PR, BK,
GR
(Structureless)
1
1,2,3 121+0.10 0.15 0.15 0.15 0.155Soil Types 2-44 Platy
NOTE: Shaded areas require system design by a professional engineer.
1 Treatment levels are defined in Table 6-3.
* Higher long-term acceptance rates for Treatment Level 3N may be allowed for OWTS required to have a discharge
permit, if the capability of the design to achieve a higher long-term acceptance rate can be substantiated.
57
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FINAT SYETEiI INSPECÍK'N AiID APPROVAL (as an8talled)
Call lor lnspectlon (24 hourc notlc€) Before Coverlng lnstallation
Syrtem lnstsller ,,.--,- .' ,, - '--,
Soptlc Tank
Septio Tank Mânufectur€r or Trede Name
Ssptic Tånk Aocitg wlthln 8" ol ¡urface
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RETAIN WTH RECEIPT RECORDS AT CO SITE
rCOllDlTlONS¡
,1. All inslrllatlonmuatoomplywlthall rsqulrcmcntsollh6ColoradoStaleBoardofHealthlndlvldualSewageDlrpoaalSysrqmtOhrPttr
?5, Allcle 10 C.R'6.1973, Rcvlaad 108¡1.
Z, Th¡s psrmlt ls valld only lor connôctlon to Êlructure¡ whloh håve lullyco.mplbd wlth County zonlng rnd bulldlng requlrcmenl¡. Oon'
ôcc¡on toor ueew¡h dny dwclllng orolrucluroc not approvod bylhe Bullding andZonlnE.oltlco shtlltutomalloållybê avlolallon orâ
requlremenl of the pÈrnilt and cãueo lor bolh logâl rolion and fovocalloñ of thð pormll.
3, Anypcnonwhocorulruots,rlten,orlnctalle¡nlndlvldusl¡ew¡g.6di3posal3yst€mlntmânncrwhlohlnvolveerknowlng_¡4llltcrlq!
"crtå¡on
rroni'rtðràlinl oi'epecltiorttons contälnod ln tho eppìlcatlón ol pðrmlt comrî¡lt ¡ Clesr l,'Petty Ollenre ($5{b.00 flnË * 6
mónlh¡ ln lrll of both).
WhIIT.APPLICANT YoIIow. DEPABTIIENT
:i, li'.;.rt {,¿-*--_ü
INDIVIDUAL SE\ryAGE DISPOSAL SYSTEM APPLICATION
à
O1VNER b Cs**tÇ*-J
ADDRESS l-,o.¡re-PHONE 9 zo -6zs*rr?Á/
CONTRACTOR
ADDRESS $e PHONB ?>o--vz6(
pBRMIT REQUEST rOR 0o T.TEW.TNSTALLATTON ( )"ALTER^{TrON ( ) REPATR
Attåctr separate sheets or report showing entire aroa with respect to zurrounding areae, topography of area, habitable
buildiqg, location of potrble wster wells, soil peroolation te$t holes, eoil profiles in test holes (See page 4).
Near what City of
Legal Description or Address
IryASTES TY?E:
c.r^d. Sub J.
3.
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( ) CoMMERCTALORTNDUSTRTAL
( ) TRA¡¡SrENT USE
( ) NON-DOMESTTC WASTES
( ) offiER-DESCRTBE
BI,JILDING OR SERVICE \
Number ofBsdrooms 3 Number of Persons 3
(X? Garùage Grinder ()Q Automatia tffasher OQ Dishwasher
SOIJßÇF AlrlD TY?E oF WATER SLJPPLY: ()Ç \4|ELL ( ) SPRINC ( ) SlREAhd OR CREEK
If supplied by Community Water, give name of supplier:N/ /1
DISTAÌ{CE TO NEAREST COMMUNITY SE\ryER SYSTEM, N/A
Was an effortmado to connect to the Community System?
A ¡ltc ol¡n ls feaulred tq bg $rbplttcd thrt lndlcates the followlns MIN.IMIM dlstenccs:
Lmch Fleld to lYoll¡ l{D fcct
Septlc Trnlr to Tltell: 50 fcct
teach Fleld to lrrlgrtlon Dltchec, Stream orlVatcr Coursel 50 feet
Septlc System to Propcrty Llne¡: (septic tank aleach f ieLd)lO feet
youR INDTVIDU,AL SEWAç E D,TSPOSAL SYSTEM PERÐßTWU,r IYOT BE TSSUED WTTHOUT
A SITE PLAN.
GR9UND CONDITIONS:
Depth to füst Ground Water
00
Pcrcent Ground 3^7"
2
TYPE OF INDIVIDUAL SE\ryAGE DISPOSAL SYSTE,M PROPOSED:
X) sÈprri TAhrK ( ) ABRATToN pLAlrT ( ) vATJLT
O VAULT PRI\ry () COMPOSTING TOILET O RECYCLINq POÎABLE USE
( ) PIr PRIÍyY ( ) INCINERATION TOTLET ( ) RECYCLTNG, OTTTER USE
( ) Cr{BMICALTOTLET ( ) OTHER-DESCRTBE
FINAL DISPOSAL BY:
(rl0 ABSORPTION TRENcn, BED oRlrr ( ) EvAporRAt{sprRArIoN
( ) UNDERGROI ND DISPERSAL ( ) sAtrD FTLTER
() ABOVE GROT'ND DISPERS^AL () IVASTE\ryATER POND
( ) oTHER-DESCTRIBE
14ryLL EFFLTJENT BE DTSCHARGED DIRECTLY INTO WATERS OF TTIE STATE?
PERCOLATION TEST RFSIJ,LS$: (To be compleed by Regietored Professional Engineer, if the Engineer does the
Fercolation Test)
Mnutes-per inch in hole No. 1 Mnutes ,,- per inoh in hole NO, 3
Mnutes-¡¡er inah in hols No. 2 Mnutes per inch in hole NO. _
Name, ¡ddrcss and telophone of RPE who m¡dç soil absorption test*
Namg addrøs and telephone ofRPE rerponsible for design ofthe system:
Applicant ncknowledges that the complctoness of the application is conditional upon suctr t¡rther mandntory and
addition¡l tests and røports as maybe roquirod byttre local health department to be made ¡nd fumíshed by the applicant
or by the loc¿l health department for purposod of the evaluation of the applioation; and the issuancc of the pormit is
subjoct to such tenns and eonditions as deemcd necessary to insure complirnce with rules and regulations made,
informcion and reporb suhnitt€d herewith and re4uired to be zubmitted by the applioant are or w¡ll bÊ ropresonted to
bo tn¡e ard aonoot to tho bost of my knowledge and bdiof and are designed to be relied on by the local department of
hcrlth in evaluating thç ¡ame for purposes of issuing the permit applied for herein. I û¡rther understand that any
ålsiûc¡tion or misreprcsentation may resrlt in ths denial of the application or revoc¡tion of any permit granted based
upon said application attd in legal aotion for porjury as provided by law.
signed -"-s - 0 ?_
ACCTJRATEMAP TO YOI.JR PROPERTY]!
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USDA
-
United States
Department of
Agriculture
NRCS
Natural
Resources
Conservation
Service
A product of the National
Cooperative Soil Survey,
a joint effort of the United
States Department of
Agriculture and other
Federal agencies, State
agencies including the
Agricultural Experiment
Stations, and local
participants
Gustom Soil Resource
Report for
Rifle Area, Colorado,
Parts of Garfield and
Mesa Counties
April 3, 2023
Preface
Soil surveys contain information that affects land use planning in survey areas.
They highlight soil limitations that affect various land uses and provide information
about the properties of the soils in the survey areas. Soil surveys are designed for
many different users, including farmers, ranchers, foresters, agronomists, urban
planners, community officials, engineers, developers, builders, and home buyers,
Also, conservationists, teachers, students, and specialists in recreation, waste
disposal, and pollution control can use the surveys to help them understand,
protect, or enhance the environment.
Various land use regulations of Federal, State, and local governments may impose
special restrictions on land use or land treatment, Soil surveys identify soil
properties that are used in making various land use or land treatment decisions.
The information is intended to help the land users identify and reduce the effects of
soil limitations on various land uses. The landowner or user is responsible for
identifying and complying with existing laws and regulations.
Although soil survey information can be used for general farm, local, and wider area
planning, onsite investigation is needed to supplement this information in some
cases, Examples include soil quality assessments (http://www.nrcs.usda.gov/wps/
portal/nrcs/main/soi ls/health/) and certain conservation and eng ineering
applications. For more detailed information, contact your local USDA Service Center
(https://offices.sc.egov.usda.gov/locator/app?agency=nrcs) or your NRCS State Soil
Scientist (http://www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/contactus/?
cid=nrcs1 42p2_05395 1 ).
Great differences in soil properties can occur within short distances. Some soils are
seasonally wet or subject to flooding. Some are too unstable to be used as a
foundation for buildings or roads. Clayey or wet soils are poorly suited to use as
septic tank absorption fields. A high water table makes a soil poorly suited to
basements or underground installations.
The National Cooperative Soil Survey is a joint effort of the United States
Department of Agriculture and other Federal agencies, State agencies including the
Agricultural Experiment Stations, and local agencies, The Natural Resources
Conservation Service (NRCS) has leadership for the Federal part of the National
Cooperative Soil Survey.
lnformation about soils is updated periodically. Updated information is available
through the NRCS Web Soil Survey, the site for official soil survey information.
The U.S. Department of Agriculture (USDA) prohibíts discrimination in all its
programs and activities on the basis of race, colo¡ national origin, age, disability,
and where applicable, sex, marital status, familial status, parental status, religion,
sexual orientation, genetic information, political beliefs, reprisal, or because all or a
part of an individual's income is derived from any public assistance program, (Not
all prohibited bases apply to all programs.) Persons with disabilities who require
2
alternat¡ve means for communication of program information (Braille, large print,
audiotape, etc.) should contact USDA's TARGET Center at (202) 720-2600 (voice
and TDD). To file a complaint of discrimination, write to USDA, Director, Office of
Civil Rights, 1400 lndependence Avenue, S.W, Washington, D.C.20250-9410 or
call (800) 795-3272 (voice) or (202) 720-6382 (TDD). USDA is an equal opportunity
provider and employer.
3
Gontents
Preface
How Soil Surveys Are Made......
SoilMap,.,.
SoilMap (Paulson)
Legend.......
Map Unit Legend (Paulson).....
Map Unit Descriptions (Paulson).
Rifle Area, Colorado, Parts of Garfield and Mesa Counties....
S4-Potts loam, I to 3 percent s|opes.........
Soil lnformation for All Uses.....
Soil Reports
Soil Physical Properties.
Physical Soil Properties (Paulson) . .
References
..2
..5
.8
.9
10
12
12
14
14
15
15
15
15
l9
4
How Soil Surveys Are Made
Soil surveys are made to provide information about the soils and miscellaneous
areas in a specific area. They include a description of the soils and miscellaneous
areas and their location on the landscape and tables that show soil properties and
limitations affecting various uses. Soil scientists observed the steepness, length,
and shape of the slopes; the general pattern of drainage; the kinds of crops and
native plants; and the kinds of bedrock, They observed and described many soil
profiles. A soil profile is the sequence of natural layers, or horizons, in a soil. The
profile extends from the surface down into the unconsolidated material in which the
soil formed or from the surface down to bedrock. The unconsolidated material is
devoid of roots and other living organisms and has not been changed by other
biological activity.
Currently, soils are mapped according to the boundaries of major land resource
areas (MLRAs). MLRAs are geographically associated land resource units that
share common characteristics related to physiography, geology, climate, water
resources, soils, biological resources, and land uses (USDA, 2006), Soil survey
areas typically consist of parts of one or more MLRA.
The soils and miscellaneous areas in a survey area occur in an orderly pattern that
is related to the geology, landforms, relief, climate, and natural vegetation of the
area. Each kind of soil and miscellaneous area is associated with a particular kind
of landform or with a segment of the landform. By observing the soils and
miscellaneous areas in the survey area and relating their position to specific
segments of the landform, a soil scientist develops a concept, or model, of how they
were formed. Thus, during mapping, this model enables the soil scientist to predict
with a considerable degree of accuracy the kind of soil or miscellaneous area at a
specific location on the landscape.
Commonly, individual soils on the landscape merge into one another as their
characteristics gradually change. To construct an accurate soil map, however, soil
scientists must determine the boundaries between the soils, They can observe only
a limited number of soil profiles. Nevertheless, these observations, supplemented
by an understanding of the soil-vegetation-landscape relationship, are sufficient to
verify predictions of the kinds of soil in an area and to determine the boundaries,
Soil scientists recorded the characteristics of the soil profiles that they studied. They
noted soil color, texture, size and shape of soil aggregates, kind and amount of rock
fragments, distribution of plant roots, reaction, and other features that enable them
to identify soils. After describing the soils in the survey area and determining their
properties, the soil scientists assigned the soils to taxonomic classes (units).
Taxonomic classes are concepts. Each taxonomic class has a set of soil
characteristics with precisely defined limits. The classes are used as a basis for
comparison to classify soils systematically, Soil taxonomy, the system of taxonomic
classification used in the United States, is based mainly on the kind and character
of soil properties and the arrangement of horizons within the profile. After the soil
5
Custom Soil Resource Report
scientists classified and named the soils in the survey area, they compared the
individual soils with similar soils in the same taxonomic class in other areas so that
they could confirm data and assemble additional data based on experience and
research.
The objective of soil mapping is not to delineate pure map unit components; the
objective is to separate the landscape into landforms or landform segments that
have similar use and management requirements. Each map unit is defined by a
unique combination of soil components and/or miscellaneous areas in predictable
proportions. Some components may be highly contrasting to the other components
of the map unit. The presence of minor components in a map unit in no way
diminishes the usefulness or accuracy of the data. The delineation of such
landforms and landform segments on the map provides sufficient information for the
development of resource plans. lf intensive use of small areas is planned, onsite
investigation is needed to define and locate the soils and miscellaneous areas.
Soil scientists make many field observations in the process of producing a soil map.
The frequency of observation is dependent upon several factors, including scale of
mapping, intensity of mapping, design of map units, complexity of the landscape,
and experience of the soil scientist. Observations are made to test and refine the
soil-landscape model and predictions and to verify the classification of the soils at
specific locations. Once the soil-landscape model is refined, a significantly smaller
number of measurements of individual soil properties are made and recorded.
These measurements may include field measurements, such as those for color,
depth to bedrock, and texture, and laboratory measurements, such as those for
content of sand, silt, clay, salt, and other components. Properties of each soil
typically vary from one point to another across the landscape.
Observations for map unit components are aggregated to develop ranges of
characteristics for the components. The aggregated values are presented. Direct
measurements do not exist for every property presented for every map unit
component. Values for some properties are estimated from combinations of other
properties.
While a soil survey is in progress, samples of some of the soils in the area generally
are collected for laboratory analyses and for engineering tests. Soil scientists
interpret the data from these analyses and tests as well as the field-observed
characteristics and the soil properties to determine the expected behavior of the
soils under different uses. lnterpretations for all of the soils are field tested through
observation of the soils in different uses and under different levels of management.
Some interpretations are modified to fit local conditions, and some new
interpretations are developed to meet local needs. Data are assembled from other
sources, such as research information, production records, and field experience of
specialists. For example, data on crop yields under defined levels of management
are assembled from farm records and from field or plot experiments on the same
kinds of soil.
Predictions about soil behavior are based not only on soil properties but also on
such variables as climate and biological activity. Soil conditions are predictable over
long periods of time, but they are not predictable from year to year. For example,
soil scientists can predict with a fairly high degree of accuracy that a given soil will
have a high water table within certain depths in most years, but they cannot predict
that a high water table will always be at a specific level in the soil on a specific date.
After soil scientists located and identified the significant natural bodies of soil in the
survey area, they drew the boundaries of these bodies on aerial photographs and
6
Custom Soil Resource Report
identified each as a specific map unit. Aerial photographs show trees, buildings,
fields, roads, and rivers, all of which help in locating boundaries accurately.
7
So Map
The soil map section includes the soil map for the defined area of interest, a list of
soil map units on the map and extent of each map unit, and cartographic symbols
displayed on the map. Also presented are various metadata about data used to
produce the map, and a description of each soil map unit.
B
=àe=ôNCustom Soil Resource ReportSoil Map (Paulson)26W26984526S5226986626€452ßæ5226S5S2ffiMap Scale: 1 :336 if pinÞd on A landscaæ (11" x 8.S) sfled._ ,Mebs0491827Feet0 '15 30 60 902698R26m2M942M1390 33 12'NE=39.33'12'N*RFñeı*a!e9RR*!Peàc!Ra*ËEI!Rn9R=çı=ıNA26S/3MI39þ 3' 11'NMap proFdþn: \¡lbb MerEbr Con'er@ord¡naÞs: WGS84 ftgEtics: UTM Zone 13N W(3S842ffi26ffi726S942ml39" 311"N
Custom Soil Resource ReportMAP LEGENDMAP INFORMATIONThe soil surveys that comprise your AOI were mapped at1:24.000.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 CountiesSurveyArea Data: Version 15, Sep 6,2022Soil 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 lhe soil lines werecompiled and digitized probably differs from the backgroundArea of lnterest (AOl)SoilsArea of lnterest (AOl)Soil Map Unit PolygonsSinkholeSlide or SlipSodic Spotã Spoil Areaû StonySpot6 VeryStonySpot# Wet Spot¿r Other.' Special Line FeaturesWater FeaturesStreams and CanalsTransportationRailsËl lnterstate Highwaysgqrd US Routes::ï. :: Major RoadsLocal RoadsBackgroundI Aerial Photographyû-ùJ Soil Map Unit LinesI Soil Map Unit PointsSpecial Point FeaturestÐ BlowoutB Borrow PitH Clay Spott Closed DepressionÞç Gravel Pit"X Gravelly SpotË Landfìll,\. Lava FlowCê Marsh or swamp* Mine or Quarryü Miscellaneous Water& Perennial WaterÞr' Rock Outcrop+ Saline Spotl.; Sandy SpotÊ Severely Eroded Spot#þøWarning: Soil Map may not be valid at this scaleEnlargement 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 ofcontrast¡ng soils that could have been shown at a more detailedscale.10
MAP LEGENDCustom Soil Resource ReportMAP INFORMATIONimagery displayed on these maps. As a result, some minorofunit boundariesbe evident.11
Custom Soil Resource Report
Map Unit Legend (Paulson)
Map Unit Descriptions (Paulson)
The map units delineated on the detailed soil maps in a soil survey represent the
soils or miscellaneous areas in the survey area. The map unit descriptions, along
with the maps, can be used to determine the composition and properties of a unit.
A map unit delineation on a soil map represents an area dominated by one or more
major kinds of soil or miscellaneous areas. A map unit is identified and named
according to the taxonomic classification of the dominant soils. Within a taxonomic
class there are precisely defined limits for the properties of the soils. On the
landscape, however, the soils are natural phenomena, and they have the
characteristic variability of all natural phenomena. Thus, the range of some
observed properties may extend beyond the limits defined for a taxonomic class.
Areas of soils of a single taxonomic class rarely, if ever, can be mapped without
including areas of other taxonomic classes. Consequently, every map unít is made
up of the soils or miscellaneous areas for which it is named and some minor
components that belong to taxonomic classes other than those of the major soils.
Most minor soils have properties similar to those of the dominant soil or soils in the
map unit, and thus they do not affect use and management. These are called
noncontrasting, or similar, components. They may or may not be mentioned in a
particular map unit description. Other minor components, howeve¡ have properties
and behavioral characteristics divergent enough to affect use or to require different
management. These are called contrasting, or dissimilar, components. They
generally are in small areas and could not be mapped separately because of the
scale used. Some small areas of strongly contrasting soils or miscellaneous areas
are identified by a special symbol on the maps. lf included in the database for a
given area, the contrasting minor components are identified in the map unit
descriptions along with some characteristics of each. A few areas of minor
components may not have been observed, and consequently they are not
mentioned in the descriptions, especially where the pattern was so complex that it
was impractical to make enough observations to identify allthe soils and
miscellaneous areas on the landscape.
The presence of minor components in a map unit in no way diminishes the
usefulness or accuracy of the data. The objective of mapping is not to delineate
pure taxonomic classes but rather to separate the landscape into landforms or
landform segments that have similar use and management requirements. The
delineation of such segments on the map provides sufficient information for the
development of resource plans. lf intensive use of small areas is planned, however,
onsite investigation is needed to define and locate the soils and miscellaneous
areas.
Map Unit Symbol Map Unit Name Acres in AOI Percent of AOI
54 Potts loam, 1 to 3 percent
slopes
0.6 100.0%
Totals for Area of lnterest 0.6 100.00¿
12
Custom Soil Resource Report
An identifying symbol precedes the map unit name in the map unit descriptions.
Each description includes general facts about the unit and gives important soil
properties and qualities.
Soils that have profiles that are almost alike make up a so/ senes. Except for
differences in texture of the surface layer, all the soils of a series have major
horizons that are similar in composition, thickness, and arrangement.
Soils of one series can differ in texture of the surface layer, slope, stoniness,
salinity, degree of erosion, and other characteristics that affect their use. On the
basis of such differences, a soil series is divided into sol/ phases. Most of the areas
shown on the detailed soil maps are phases of soil series. The name of a soil phase
commonly indicates a feature that affects use or management. For example, Alpha
silt loam, 0 to 2 percent slopes, is a phase of the Alpha series.
Some map units are made up of two or more major soils or miscellaneous areas.
These map units are complexes, associations, or undifferentiated groups.
A complex consists of two or more soils or miscellaneous areas in such an intricate
pattern or in such small areas that they cannot be shown separately on the maps.
The pattern and proportion of the soils or miscellaneous areas are somewhat similar
in all areas. Alpha-Beta complex, 0 to 6 percent slopes, is an example.
An associafion is made up of two or more geographically associated soils or
miscellaneous areas that are shown as one unit on the maps. Because of present
or anticipated uses of the map units in the survey area, it was not considered
practical or necessary to map the soils or miscellaneous areas separately. The
pattern and relative proportion of the soils or miscellaneous areas are somewhat
similar. Alpha-Beta association, 0 to 2 percent slopes, is an example.
An undifferentiated group is made up of two or more soils or miscellaneous areas
that could be mapped individually but are mapped as one unit because similar
interpretations can be made for use and management. The pattern and proportion
of the soils or miscellaneous areas in a mapped area are not uniform. An area can
be made up of only one of the major soils or miscellaneous areas, or it can be made
up of all of them. Alpha and Beta soils, 0 to 2 percent slopes, is an example.
Some surveys include miscellaneous areas. Such areas have little or no soil
material and support little or no vegetation. Rock outcrop is an example.
13
Custom Soil Resource Report
Rifle Area, Colorado, Parts of Garfield and Mesa Counties
54-Potts loam, I to 3 percent slopes
Map Unit Setting
National map unit symbol: )nyq
Elevation: 5,000 to 7,000 feet
Farmland classification: Prime farmland if irrigated
Map Unit Gomposition
Potts and similar soils; 85 percent
Estimates are based on observations, descriptions, and transects of the mapunit
Description of Potts
Setting
Landform: Mesas, benches, valley sides
Down-slope shape: Convex, linear
Across-s/op e shape : Convex, linear
Parent material: Alluvium derived from basalt and/or alluvium derived from
sandstone and shale
Typical profile
H1 -0to4inches: loam
H2 - 4 to 28 inches; clay loam
H3 - 28 to 60 inches.' loam
Properties and qualities
S/ope:lto3percent
Depth to restrictive feature: More than 80 inches
Drainage c/ass: Well drained
Runoff class: Medium
Capacity of the most limiting layer to transmit water (Ksat); Moderately high (0.20
to 0.60 in/hr)
Depth to watertable: More than 80 inches
Frequency of flooding: None
Frequency of ponding: None
Calcium carbonate, maximum content: 15 percent
Maximum salinity: Nonsaline to very slightly saline (0.0 to 2.0 mmhos/cm)
Available water supply, 0 to 60 inches: High (about 10.3 inches)
lnterpretive groups
Land capability classification (irrigated): 3e
Land capability classification (nonirrigated): 3c
Hydrologic Soil Group: C
Ecologicalsife; R04BAY306UT - Upland Loam (Wyoming Big Sagebrush)
Hydric soil rating: No
14
Soil lnformation for All Uses
Soil Reports
The Soil Reports section includes various formatted tabular and narrative reports
(tables) containing data for each selected soil map unit and each component of
each unit. No aggregation of data has occurred as is done in reports in the Soil
Properties and Qualities and Suitabilities and Limitations sections.
The reports contain soil interpretive information as well as basic soil properties and
qualities. A description of each report (table) is included.
Soil Physical Properties
This folder contains a collection of tabular reports that present soil physical
properties. The reports (tables) include all selected map units and components for
each map unit. Soil physical properties are measured or inferred from direct
observations in the field or laboratory. Examples of soil physical properties include
percent clay, organic matter, saturated hydraulic conductivity, available water
capacity, and bulk density.
Physical Soil Properties (Paulson)
This table shows estimates of some physical characteristics and features that affect
soil behavior. These estimates are given for the layers of each soil in the survey
area. The estimates are based on field observations and on test data for these and
similar soils.
Depth to the upper and lower boundaries of each layer is indicated.
Particle size is the effective diameter of a soil particle as measured by
sedimentation, sieving, or micrometric methods. Particle sizes are expressed as
classes with specific effective diameter class limits. The broad classes are sand,
silt, and clay, ranging from the larger to the smaller.
Sand as a soil separate consists of mineral soil particles that are 0.05 millimeter to 2
millimeters in diameter. ln this table, the estimated sand content of each soil layer is
given as a percentage, by weight, of the soil material that is less than 2 millimeters
in diameter.
Si/f as a soil separate consists of mineral soil particles that are 0.002 to 0.05
millimeter in diameter. ln this table, the estimated silt content of each soil layer is
15
Custom Soil Resource Report
given as a percentage, by weight, of the soil material that is less than 2 millimeters
in diameter.
Clay as a soil separate consists of mineral soil particles that are less than 0.002
millimeter in diameter. ln this table, the estimated clay content of each soil layer is
given as a percentage, by weight, of the soil material that is less than 2 millimeters
in diameter.
The content of sand, silt, and clay affects the physical behavior of a soil. Particle
size is important for engineering and agronomic interpretations, for determination of
soil hydrologic qualities, and for soil classification.
The amount and kind of clay affect the fertility and physical condition of the soil and
the ability of the soil to adsorb cations and to retain moisture. They influence shrink-
swell potential, saturated hydraulic conductivity (Ksat), plasticity, the ease of soil
dispersion, and other soil properties. The amount and kind of clay in a soil also
affect tillage and earthmoving operations.
Moist bulk density is the weight of soil (ovendry) per unit volume. Volume is
measured when the soil is at field moisture capacity, that is, the moisture content at
113- or 1110-bar (33kPa or lOkPa) moisture tension. Weight is determined after the
soil is dried at 105 degrees C. ln the table, the estimated moist bulk density of each
soil horizon is expressed in grams per cubic centimeter of soil material that is less
than 2 millimeters in diameter. Bulk density data are used to compute linear
extensibility, shrink-swell potential, available water capacity, total pore space, and
other soil properties. The moist bulk density of a soil indicates the pore space
available for water and roots. Depending on soil texture, a bulk density of more than
1.4 can restrict water storage and root penetration. Moist bulk density is influenced
by texture, kind of clay, content of organic matter, and soil structure.
Saturated hydraulic conductivity (Ksat) refers to the ease with which pores in a
saturated soil transmit water. The estimates in the table are expressed in terms of
micrometers per second. They are based on soil characteristics observed in the
field, particularly structure, porosity, and texture. Saturated hydraulic conductivity
(Ksat) is considered in the design of soil drainage systems and septic tank
absorption fields.
Available water capacity refers to the quantity of water that the soil is capable of
storing for use by plants. The capacity for water storage is given in inches of water
per inch of soil for each soil layer. The capacity varies, depending on soil properties
that affect retention of water. The most important properties are the content of
organic matter, soil texture, bulk density, and soil structure. Available water capacity
is an important factor in the choice of plants or crops to be grown and in the design
and management of irrigation systems. Available water capacity is not an estimate
of the quantity of water actually available to plants at any given time.
Linear extensibility refers to the change in length of an unconfined clod as moisture
content is decreased from a moist to a dry state. lt is an expression of the volume
change between the water content of the clod al113- or 1l1O-bar tension (33kPa or
lOkPa tension) and oven dryness. The volume change is reported in the table as
percent change for the whole soil. The amount and type of clay minerals in the soil
influence volume change.
Linear extensibility is used to determine the shrink-swell potential of soils. The
shrink-swell potential is low if the soil has a linear extensibility of less than 3
percent; moderate if 3 to 6 percent; high if 6 to 9 percent; and very high if more than
9 percent. lf the linear extensibility is more than 3, shrinking and swelling can cause
16
Custom Soil Resource Report
damage to buildings, roads, and other structures and to plant roots. Special design
commonly is needed.
Organic matter is the plant and animal residue in the soil at various stages of
decomposition. ln this table, the estimated content of organic matter is expressed
as a percentage, by weight, of the soil material that is less than 2 millimeters in
diameter. The content of organic matter in a soil can be maintained by returning
crop residue to the soil.
Organic matter has a positive effect on available water capacity, water infiltration,
soil organism activity, and tilth. lt is a source of nitrogen and other nutrients for
crops and soil organisms.
Erosion factors are shown in the table as the K factor (Kw and Kf) and the T factor.
Erosion factor K indicates the susceptibility of a soil to sheet and rill erosion by
water. Factor K is one of six factors used in the Universal Soil Loss Equation
(USLE) and the Revised Universal Soil Loss Equation (RUSLE)to predict the
average annual rate of soil loss by sheet and rill erosion in tons per acre per year.
The estimates are based primarily on percentage of silt, sand, and organic matter
and on soil structure and Ksat. Values of K range from 0.02 to 0.69. Other factors
being equal, the higher the value, the more susceptible the soil is to sheet and rill
erosion by water.
Erosion factor Ku¡ indicates the erodibility of the whole soil. The estimates are
modified by the presence of rock fragments.
Erosion factor Kf indicates the erodibility of the fine-earth fraction, or the material
less than 2 millimeters in size.
Erosion factor f is an estimate of the maximum average annual rate of soil erosion
by wind and/or water that can occur without affecting crop productivity over a
sustained period. The rate is in tons per acre per year.
Wind erodibility groups are made up of soils that have similar properties affecting
their susceptibility to wind erosion in cultivated areas. The soils assigned to group 1
are the most susceptible to wind erosion, and those assigned to group B are the
least susceptible. The groups are described in the "National Soil Survey Handbook."
Wind erodibility index is a numerical value indicating the susceptibility of soil to wind
erosion, or the tons per acre per year that can be expected to be lost to wind
erosion. There is a close correlation between wind erosion and the texture of the
surface layer, the size and durability of surface clods, rock fragments, organic
matter, and a calcareous reaction. Soil moisture and frozen soil layers also
influence wind erosion.
Reference:
United States Depadment of Agriculture, Natural Resources Conservation Service.
National soil survey handbook, title 430-Vl. (http://soils.usda.gov)
17
Custom Soil Resource ReportThree values are provided to identify the expected Low (L), Representative Value (R), and High (H).Physical $oi! Propertles-Rlfle Area, Colorado, Parts of Garfield and Mesa CountiesTlllndettdibltlglndex56WTnderodbllitygrouB5ErosionfactorsT5Kf.37.32.37Kw.37.32.37OrganicrnatterPct1.0- 1.5-2.00.5- 0.8-1.00.0- 0.3-0-5Linearextens¡b¡lityPct0.0- 1.5- 2.93.0- 4,5- 5.90.0- 1.5- 2.9Availablêwâtêrcapaclffln/ln0.'t4-0.16-0.170.17-0.19-0.200.1 4-0.1 6-0.17Saturatedhydraulicconductivitymicro m/sec4.23-23.28-42.341.41-2.82-4.234.23-23.28-42.34Molstbulkdensltyg/cc1.25-1.33-1.401.25-1.33-1.401.25-1.33-1.40ClayPct10-15- 2027-31- 3415-20- 25s¡ttPct41--36--38-SandPct44--33-42-Depthln0-44-2828-60Map symboland soil nameS4-Potts loam,1 to 3 percentslopesPotts18
References
American Association of State Highway and Transportation Officials (AASHTO).
2004. Standard specifications for transportation materials and methods of sampling
and testing. 24th edition.
American Society for Testing and Materials (ASTM). 2005. Standard classification of
soils for engineering purposes. ASTM Standard D2487-00.
Cowardin, L.M., V. Carter, F.C. Golet, and E.T. LaRoe. '1979. Classification of
wetlands and deep-water habitats of the United States. U.S. Fish and Wildlife
Service FWS/OBS-79/3 1 .
Federal Register. July 13, 1994. Changes in hydric soils of the United States.
Federal Register. September 18,2002. Hydric soils of the United States.
Hurt, G,W., and L.M. Vasilas, editors. Version 6.0, 2006. Field indicators of hydric
soils in the United States.
National Research Council. 1995. Wetlands: Characteristics and boundaries.
SoilSurvey Division Staff. 1993, Soilsurvey manual. Soil Conservation Service.
U. S. Department of Agriculture Handbook 1 B. http:i/www. n rcs. usda. gov/wps/portal/
n rcs/d eta i I /n ati o n a l/s o i I s/? c i d = n rcs I 4 2p2 _0 5 4262
Soil Survey Staff, 1999. Soil taxonomy: A basic system of soil classification for
making and interpreting soilsurveys. 2nd edition. Natural Resources Conservation
Service, U.S. Department of Agriculture Handbook 436. http://
www.nrcs.usda.gov/wps/portal/nrcs/detail/nationalisoils/?cid=nrcs|42p2_053577
Soil Survey Staff. 2010. Keys to soiltaxonomy. 11th edition. U.S. Department of
Agriculture, Natural Resources Conservation Service. http:i/
www.nrcs.usda.gov/wps/portal/nrcsidetail/national/soils/?cid =nrcs142p2_053580
Tiner, R.W., Jr. 1985. Wetlands of Delaware. U.S. Fish and Wildlife Service and
Delaware Department of Natural Resources and Environmental Control, Wetlands
Section.
United States Army Corps of Engineers, Environmental Laboratory. 1987. Corps of
Engineers wetlands delineation manual. Wateruvays Experiment Station Technical
Report Y-87-1.
United States Department of Agriculture, Natural Resources Conservation Service.
National forestry manual. http:i/www.nrcs.usda.gov/wps/portal/nrcs/detail/soils/
ho m e/? cid = nr cs1 42p2 _0 5337 4
United States Department of Agriculture, Natural Resources Conservation Service.
National range and pasture handbook. http://www.nrcs.usda.gov/wps/portalinrcs/
detail/national/land use/ra ngepastu re/?cid=stelprdb 1 043084
19
Custom Soil Resource Report
United States Department of Agriculture, Natural Resources Conservation Service
National soil survey handbook, title 430-Vl. http://www.nrcs.usda.gov/wps/portal/
nrcs/detail/soils/scientistsi?cid=nrcs 1 42p2_054242
United States Departmentof Agriculture, Natural Resources Conservation Service
2006. Land resource regions and major land resource areas of the United States,
the Caribbean, and the Pacific Basin. U.S. Department of Agriculture Handbook
296. http:/iwww.nrcs.usda.gov/wps/portal/nrcs/detail/national/soils/?
cid=nrcs142p2_053624
United States Department of Agriculture, Soil Conservation Service. 1961 . Land
capability classification. U.S. Department of Agriculture Handbook 210. htlp,,ll
www. n rcs. usda. gov/l nternet/FS E_DOCU M ENTS I nrcsl 42p2_052290.pdf
20
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52'PtPt 12" lNTO rOP OF Grophic Scole(|vP.)INFILTMTOR UNIT
8
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45'BEND, ÙP Scole:ì/4"=l!0"
GFNERAL OI'IITS NOTES:
1.
2.
J.
4.
5.
6.
7.
TH|S lS rHE REPUCEMENT OF A SO|L TREATMENT AREA (SrA) FOR AN EX\SqNG SySrEÀ|. rHE
IXISTING I25O_GAL, 2-COIIIPARTMENT SEPNC ANK ß /N GOOD CONDIT/ON AND WLL REIV'/A/N.
NEry SrA rO BE BED STYLE WrH INFILTRATORS. BED SHALL BE APPROXIMATELY 12x68 FT,,
BE|NG FOUR ROtvS OF 17 UN/rS (68 rOrAL).
A NEW DISTR|BUT|ON BOX SHALL BE INSTALLED, USE RlSERS AS NECESSARY TO BR|NG TO
GRADE.
rHE AREAS DISTURB.D BY CONSTRUCTION SHALL Bf R._S.EDED WTH NAflVE GRASS TO
PREUENT EROSION.
ALL
'I/ORK
SHALL MEET THE REQU'REMENTS OF THE GARF|ELD COUNTY PUBLIC HEALTH AGENCY
ON_SITE WASTEWATER TREATu4ENT SYSTEM REGULAîIONS AND COLORADO DEPARTIV'IENT OF PUBL|C
HEALTH AND ENV\RONIIENT RfGUUilAN 43.
CONTRACTOR ANÐ OWN.R SHALL TAKF WHAT.VER M.ASURES ARE NECESSARY TO ASSURE THAT(o) sEPnc TANK AND sEþ/fR LINES ARE COMPLETELY WA\ER T/GH\, AND (b) rHE SYSTEM lS
lNSTALLED TO PREVENT FR.EZ\NG OF ALL GRAWry SEWER L/NES.
rHE GARFIELD COUNTY DEPARTMENT OF PUBL/C HEALîH AND .NGINEER SHALL BE NONF/ED WHEN
CONSTRUCNON COM¡4INCES AND KEPT ABREAST OF THE CONSTRUCT/ON PROGRISS SO THAT
SUFFICIENT INSPECT/ON CAN BE PERFORM.D TO ASSURE CONFORMANCE WTH THESI PUNS
PROV|DI A L4|N/MUM OF 48 HOURS NOilCf TO EACH.
NO VEHICUUR TRAFF|C SHALL BE ALLOWED ON THE PROPOSED SO|L TREATMENT AREA,
/T /S THE CONTRACTOR'S RESPONSIB/Ury TO VER\FY ALL UNLI'IY LOCANONS THAT MAY EFFECT
THE LOCANONS OF THf OI'YTS FACILITIES DRAWN. VERIFICAT|ON lS TO Bf MADE WTH THE OWNER
AND THE ÀFFECTED UTlLlrt' COMPÀNIES.
8.
L
10.
POLY DISTflBUNON BOX,
RISERS AS NEEDED
TO GMDE
o$bÊ PVC SEWER
EX. SEPNC TANK
su?snrunoN oF MA\ER/ALS (/.E., PIPE, TANKS, ETC.) lS ACCEPTABLE PROV\DED V'R\F/CAflON
AND ACCqPTANCE 8Y THE ENG'NIER AND ENV.RONMENTAL HEALTH OFF\CER lS OETAINED.
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POLYLOK FQUALIZER AT
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ALL ROI'YS. NSTALL /N lRRlGA
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NON VALVF BOX.
4,, NOTCH TO Bf CUT /NTO BONOM OF PIPE.
FIN/SH GROUND. PROWDF POS|NVE DRA\NAG|
/NFILTRATOR CHAN,IBER SYSTEM QU|CK4 STANDARD UN/TS
SfE ATTACHED REPORT I4//TH UYOUT AND
OVER AND AWAY FROM FlELD NUMBER OF UN/TS
3A" MtN. COV.R
44,'MAX.I
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SCAR|FT EXCAVATED L'ACHING
SURFACE BED SURFAC. TO BE
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STUB 4'' SDR_J5 SEWFR PlPE
12'' lNTO TOP OF INF\LTRATOR UNIT
|YPICAL SO.L TREATMENT AREA SECT|ON
NOTES:
I, REFIR TO AIANUFACTURFRS INSTRUCNONS FOR INSÍALUîION OF INNLTMîOR CI'4MAFRS.
:{ll
QUICK4 STANÞARD CHAMBER
*øñg,lüv DFH lr 1dr
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END WEW
INFILTRATOR WATER TECHNOLOGIES
QUICK4 STANDARD CHAMBER
PRODUCT SPECIFICATIONS
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QU|CK4 STANDARD MULNPORT END
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15" INLFT ENN*
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SCALE N.î.5.
Poulson Residence OWIS
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No.
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