HomeMy WebLinkAbout1.39 OWTS Engineers ReportNutrient Farm P.U.D. September 2021
OWTS Engineering Report i
OWTS ENGINEERING REPORT
NUTRIENT FARM P.U.D.
Prepared by
SEPTEMBER 2021
SGM
SGM
SITE
I-70
COLORADO
RIVER
Nutrient Farm P.U.D. September 2021
OWTS Engineering Report ii
NUTRIENT FARM P.U.D
“I hereby affirm that this report for the Onsite Wastewater Treatment System (OWTS) for Nutrient
Farm was prepared by me or under my direct supervision for the Owners thereof in accordance with
the provisions of Garfield County’s Land Use and 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.”
______________________________________ License No. ____________________
Licensed Professional Engineer, State of Colorado (Affix Seal)
PREPARED BY:
TERRY BENDETTI, P.E.
SGM Project # 2021-145-NoreTrust
12/09/2021
Nutrient Farm P.U.D. September 2021
OWTS Engineering Report iii
TABLE OF CONTENTS
Nutrient Farm P.U.D. September 2021
OWTS Engineering Report iv
LIST OF TABLES
TABLE 1 - Proposed Sewage Disposal System 6-6
TABLE 2 - Ultimate Wastewater Flows and Number OWTS 6-9
LIST OF FIGURES
Figure 1: HIA for OWTSs
LIST OF APPENDICES
Appendix A
OWTS Preliminary Analysis and Design
Appendix B
WQSA-6
Appendix C
HIA Calculations
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OWTS Engineering Report 6-5
Nutrient Farm P.U.D. September 2021
OWTS Engineering Report 6-6
few of the residential areas identified in the August 1976 Map have since been subdivided
and developed with homes. Of the original 1,180.83-acre PUD, approximately 1,140 acres
has not been developed. This acreage has been transferred to Nutrient Holdings, LLC and
is the subject property for this sewage disposal adequacy report.
Nutrient Farm P.U.D. September 2021
OWTS Engineering Report 6-7
Seventeen, one-half acre lots with one additional dwelling unit (ADU) are proposed for land
use areas 1, 3 and 4. The calculated EQR for these land use areas is 30.6 (17 + 17(0.8)).
The existing treatment system has the design capacity to treat the additional wastewater
flow from these proposed areas.
2.4 Planned Onsite Wastewater Treatment Systems (OWTS)
Land use areas 2, 5, 6, 7 and 8 will have onsite wastewater treatment systems (OWTS)
installed to treat sewage wastewater. This type of wastewater system is applicable in
Garfield County if the following criteria stated in Article 7-105.B of the County’s Land Use
Code is met. The criteria is:
· The areas are located farther than 400 feet from a sewage treatment facility.
· Existing facilities are not adequate to serve the proposed development.
· Connection is not practicable and feasible.
· The proposed areas are greater than one acre in size.
Land use areas 2, 5, 6, 7 and 8 are located farther than 400 feet from the closest sewage
treatment facility, which is the existing Riverbend Wastewater Treatment Facility. This
facility does not have the design capacity to treat the estimated wastewater generated in
these land use areas without being physically enlarged.
The next nearest wastewater facility connection is to the west, which is the Town of New
Castle. To connect to the Town’s system would require installation of a lift station and over
two miles of piping. In addition, the sewer extension would need to cross the Colorado River
and I-70.
SGM is of the opinion that:
· Connection to either of the nearest treatment facilities is neither physically nor
economically feasible.
· These land use areas meet requirements outlined in Section 7-105.B of the County’s
Land Use Code, so OWTSs are acceptable for these areas.
Nutrient Farm P.U.D. September 2021
OWTS Engineering Report 6-8
1. Must have a wastewater design capacity less than or equal to 2,000 gallons per day
(gpd) and must comply with Reg43.
2. Or, if certain requirements contained in the Colorado Water Quality Control Division’s
(CWQCD) “Water Quality Site Application Policy” (WQSA-6) are met and OWTS designs
meet Reg43 requirements, a site may be allowed to have multiple OWTS capable of
treating up to 6,000 gpd of wastewater flow.
If a site’s daily wastewater flow rate exceeds 2,000 gpd and item 2 cannot be met, or a site
produces more than 6,000 gpd of wastewater flow, a site location and design approval under
the requirements of Colorado’s Regulation No. 22 is required.
3.1 Water Quality Site Application Policy - WQSA-6
WQSA-6 was published by the Colorado Water Quality Control Division (CWQCD) in order
to clarify the applicability of Regulation 22 to multiple OWTSs that have a total design
capacity of 2,000 gpd or more and are serving as a community system, a single property or
wastewater generator. Lack of guidance led to inconsistent interpretation as to whether a
site application approval and discharge permit are required for sites with multiple systems.
Guidelines established in WQSA-6 clarifies when sites with multiple OWTSs shall be treated
as a single wastewater treatment works subject to Regulation No. 22.
The policy of WQSA-6 is that multiple OWTSs shall be treated as a single wastewater
treatment works subject to Regulation 22 if the combined design capacity of the systems is
2,000 gpd or more, irrespective of whether the systems were constructed at the same time
or at different times, and where one or more of six conditions is/are met.
A copy of WQSA-6 is included in the Appendix where the six conditions can be reviewed, in
addition to other requirements should the combined capacity of individual site systems under
consideration be greater than 6,000 gpd.
3.2 Applicability of WQSA-6 to Subject Property
Subsection 2.4 states land use areas 2, 5, 6, 7 and 8 will utilize OWTSs for disposal of
wastewater. Each land use area has sufficient acreage to be considered separate, distinct
sites when applying WQSA-6.
To determine how WQSA-6 applies to each land use area the following is required:
· Total design flow for each land use area.
· Number of OWTS to be installed in each land use area.
· Calculation of the horizontal influence area for each system per note 1criteria of
WQSA-6.
Nutrient Farm P.U.D. September 2021
OWTS Engineering Report 6-9
TABLE 2 - Ultimate Wastewater Flows and Number OWTS
Area Proposed Land Use Operations
Wastewater
Flow
Classification
Design
gpd
Number
of OWTS
2 Existing Rural Single Family Residence Residential N/A 1
5 Rural Single Family Residence, 4 Bedroom
+ 1 ADU, assumed Residential 600 1
6 Farm Store, Restaurant, Adventure Farm Commercial 10,735 2
7 Commercial/Professional/Retail Buildings Commercial 1,000 1
8
Adventure Park; Water Park, Pool and
Campground; Self-Service Laundry; RV
Park; Retreat and Cabins
Commercial 9,455 7
Total Combined Design Capacity 21,790 12
3.3 Horizontal Influence Areas (HIA)
It was previously stated in Section 3.1 that multiple OWTSs having a combined design
capacity greater that 2,000 gpd could be considered separate systems if they do not serve a
single occupied structure, are not interconnected and their HIA’s do not overlap. Of the six
conditions stated in WQSA-6, found in the Appendix, condition 2 applies to the Nutrient
Farm P.U.D. Application.
Condition 2 requires that the septic systems serve more than one habitable structure on a
single property, owned by one person or company, and the HIA to be maintained from one
system’s STA overlaps the minimum horizontal separations of another facility’s STA, wells,
streams, lakes, water course, or potable water lines as calculated using the method
described in note 1, WQSA-6.
The OWTSs proposed for the land use areas of this P.U.D. do not serve a single occupied
structure and are not interconnected. The last requirement is to determine if the HIA of any
OWTS’s STA overlaps another systems STA.
Note 1 of WQSA-6 requires the following formula be used to calculate the offset distance for
an OWTS’s HIA.
HIA Required = 100 + [(DF – 1000) / 100] X 8,
Where DF = Design Flow = 1.5 x DC.
DC = Design Capacity = Average Daily Flow at Maximum Occupancy.
The outer boundary of the STA is offset the calculated HIA distance for each OWTS, if the
offset boundaries overlap, the systems are considered one system. If there is no overlap,
each system is considered separate and can have a daily wastewater flow capacity of up to
2,000 gpd.
In the preliminary design, each STA was sized and had their respective HIAs calculated
under full development. Location for each OWTS was selected to ensure no overlapping of
any systems HIA would occur, see Figure 1. As such, each OWTS is considered a separate
system and can have a design capacity of up to 2,000 gpd, which allows each land use area
to have a total design capacity of up to 6,000 gpd before triggering review under Regulation
22 by CWQCD.
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OWTS Engineering Report 6-11
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Nutrient Farm P.U.D. September 2021
Appendix A
Appendix A
OWTS Preliminary Analysis and Design
OWTS PRELIMINARY ANALYSIS AND DESIGN
NUTRIENT FARM
Prepared by
SEPTEMBER 2021
SGM
SGM
SITE
I-70
COLORADO
RIVER
Nutrient Farm September 2021
OWTS Preliminary Analysis and Design ii
NUTRIENT FARM
“I hereby affirm that this report and the accompanying plans for the Onsite Wastewater Treatment
System (OWTS) for Nutrient Farm were prepared by me or under my direct supervision for the
owners thereof in accordance with the provisions of Garfield County’s Regulation 43 and approved
variances and exceptions listed thereto. I understand the County does not and will not assume
liability for OWTS facilities designed by others.”
______________________________________ License No. ____________________
Licensed Professional Engineer, State of Colorado (Affix Seal)
PREPARED BY:
TERRY BENDETTI, P.E.
SGM Project # 2018-271.002
12/09/2021
Nutrient Farm September 2021
OWTS Preliminary Analysis and Design iii
TABLE OF CONTENTS
Nutrient Farm September 2021
OWTS Preliminary Analysis and Design iv
LIST OF FIGURES
Figure 1 - NRCS Soil Unit Map
Figure 2 – Proposed Land Use
Figure 3 – Land Use Area 5 Preliminary OWTS
Figure 4 – Land Use Area 6-1 and 6-2 Preliminary OWTS
Figure 5 – Land Use Area 6-3 Preliminary OWTS
Figure 6 – Land Use Area 7-1 Preliminary OWTS
Figure 7 – Land Use Area 8-1 Preliminary OWTS
Figure 8 – Land Use Area 8-2 Preliminary OWTS
Figure 9 – Land Use Area 8-3A Preliminary OWTS
Figure 10 – Land Use Area 8-3B Preliminary OWTS
Figure 11 – Land Use Area 8-4 Preliminary OWTS
Figure 12 – Land Use Area 8-5A Preliminary OWTS
Figure 13 – Land Use Area 8-5B Preliminary OWTS
Appendix
NRCS Soil Data – Percent Silt
NRCS Soil Data – Percent Sand
NRCS Soil Data – Percent Clay
NRCS Soil Unit 29 and 30 USDA Textural Triangle
NRCS Soil Unit 47 and 51 USDA Textural Triangle
NRCS Soil Data – Depth to any Restrictive Layer
NRCS Soil Data – Septic Tank Absorption Fields
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The existing residence uses an ISDS (Individual Sewage Disposal System) and the building
permit indicates an ISDS permit was included, but no information on the ISDS permit could
be obtained. Therefore,
· The size of the septic tank is not known.
· The square footage of the soil treatment area is not known.
· The type of soil treatment area is not known, i.e. bed or trench.
· The distribution media in the soil treatment area is not known.
· And the method of effluent application in the soil treatment area is not known, i.e.
gravity, dosed or pressure.
2.3 Topography
Topography showing existing conditions has been provided for the subject property. The
topography indicates slope shapes are favorable to support soil treatment areas (STA) in
accordance with criteria outlined in Reg43. It also indicates the landscape position is
favorable per Reg43, which is further described in following sections for each preliminary
OWTS design.
OWTS can be installed on slopes up to 30 percent (3.3H:1V) without having to be designed
by a professional engineer registered and licensed to practice in the State of Colorado. Per
the NRCS soil unit data, there may be some areas that may be in excess of the 30 percent
criterion that would require engineered design.
2.4 Soil Data
The National Resource Conservation Service (NRCS) provides soil data and information
produced by the National Cooperative Soil Survey. This data can be used for many
purposes, which one is developing a preliminary understanding of the soil type expected to
be encountered in areas where STA are to be located. The proposed STA for each
proposed OWTS will be located in one of the following NRCS soil units, 29, 30, 47 or 51as
shown on F.
Soil Units 29 and 30 consists of Heldt clay loam, which has grades between 3 to 6 percent
for soil unit 29 and 6 to 12 percent for unit 30. NRCS ratings for the percentage of clays,
sands and silts for these soil units are 47.5%, 23.3% and 29.2%, respectively. NRCS
reports the depth to the most restrictive layer for these soil units to be greater than 6.5 feet.
Using the NRCS percentages for clays, sands and silts in the United States Department of
Agriculture (USDA) textural triangle, these soil units have a soil texture of silty clay and a soil
type of 4 or 4A. More information is required to determine the true soil type classification
and long term application rate (LTAR) to use, which will be collected during the detailed soil
investigation. However, until this information is obtained, the soil type classification of 4A is
used for preliminary design. Soil type 4A has a more stringent LTAR than soil type 4, 0.15
g/d/ft2 compared to 0.20 g/d/ft2, respectively.
Soil type classification of 4 or 4A for soil units 29 and 30 is consistent with the reported
NRCS septic tank absorption field rating, which is very limited due to slow movement of
water through these soil units, having a rating of 1.0.
Soil unit 47 consist of Nihill channery loam, which has grades between 6 to 25 percent.
NRCS ratings for the percentage of clays is 21.0%. NRCS ratings for sands and silts are not
Nutrient Farm September 2021
OWTS Preliminary Analysis and Design 7
provided. NRCS reports the depth to the most restrictive layer as being greater than 6.5
feet.
Using the USDA textural triangle, a soil with a clay percentage of 21% would contain 79%
sand and classify as loamy, or soil type 1. More information is required to determine the true
soil type classification and LTAR to use, which will be collected during the detailed soil
investigation. However, until this information is obtained, the soil type classification of 1 is
used for preliminary design for OWTS proposed in this soil unit. Type 1 soils have a LTAR
of 0.80 for TL-1.
Soil type classification of 1 for soil unit 47 is consistent with the reported NRCS septic tank
absorption field rating, which is very limited, primarily due to slopes and secondary to the
possibility of large stones being found in this soil unit. However, these limitations can be
overcome by engineered design.
Soil unit 51 consists of Olney loam, which has grades between 6 to 12 percent. NRCS
ratings for the percentage of clays, sands and silts for this soil unit are 19.0%, 66.0% and
15.0%, respectively. NRCS reports the depth to the most restrictive layer as being greater
than 6.5 feet. Under preliminary design conditions, this soil unit has a USDA soil texture of
loam and a soil type of 2 or 2A. More information is required to determine the true soil type
classification and LTAR to use, which will be collected as part of the detailed soil
investigation. However, until this information is obtained, the soil type classification of 2A
will be used. Soil type 2A has a more stringent LTAR than soil type 2, 0.50 g/d/ft2 compared
to 0.60 g/d/ft2, respectively.
Soil type classification of 2 or 2A for soil unit 51 is consistent with the reported NRCS septic
tank absorption field rating, which is somewhat limited due to slopes and slow water
movement through this soil unit. The slow water movement is rated as 0.47, which is
indicative of a LTAR of 0.5 g/d/ft2 and the slope as 0.04.
The following table summarizes soil type classification for the NRCS soil units. Figure 1
shows their relationship to the proposed development.
NRCS Soil Unit 29 30 47 51
Soil Type Classification 4A 4A 1 2A
LTAR 0.15 0.15 0.8 0.5
2.5 Location of Physical Features Requiring Setbacks
Setbacks per Table 7-1 of Reg43 are shown in the following table and on Figures 3 through
11. The minimum required setback distances can be met in all land use areas where
wastewater is proposed to be treated by an OWTS.
Well
Potable
Water
Supply Line
Structure
with
Footing
Drains
Property
Lines
Intermittent
Irrigation
Cut
Bank,
Dry
Gulch
Septic
Tank
Septic Tank 50 10 5 10 10 10 --
Effluent Line 50 5 N/A 10 10 10 --
STA 100 25 20 10 25 25 5
*All setback distances are in feet.
See OWTS Figures 3-11 for setbacks required for each individual system.
Job No.Drawn by:Date:File:PE:QC:Graphic Scale
In Feet: 1" = 2000'
0 1000 2000 4000 NRCS Soil Unit Map2018-271.002TLB06/07/2021DKOWTS-Prelim-Design-PlanDKFIG118 West Sixth Street, Suite 200Glenwood Springs, CO 81601970.945.1004 www.sgm-inc.com 1
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OWTS Preliminary Analysis and Design 9
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OWTS Preliminary Analysis and Design 10
Area Proposed Land Use Operations
Wastewater
Flow
Classification
GPD/
Person
No.
Persons
Design
gpd
6-3 4Adventure Farm Commercial 5/Visitor 118 Visitors 590
Total Design Wastewater Flow to Size OWTS 6-3 590
Anticipated Total Daily Design Flow for Area 6 10,735
7
6Commercial/Professional/Retail
Buildings Commercial 15/
Employee
50
Employees 750
4Short-term Transient Visitors Commercial 5/Visitor 50 Visitors 250
Total Design Wastewater Flow to Size OWTS 7 1,000
Anticipated Total Daily Design Flow for Area 7 1,000
8-1 4Adventure Park Commercial 5/ Visitor 25 Visitors 125
5Restaraunt Commercial 50/Seat 13 Seats 650
6Office Commercial 15/
Employee 2 30
Total Design Wastewater Flow to Size OWTS 8-1 805
8-2 7Water Park and Pool Commercial 10/Visitor 50 Visitors 250
7Campground Pool Commercial 10/Visitor 50 Visitors 500
8Self-service Laundry Commercial 400/
Machine 2 Machines 800
Total Design Wastewater Flow to Size OWTS 8-2 1,550
8-3A 9Camp Sites Commercial 50/Site 36 Sites 1,800
Total Design Wastewater Flow to Size OWTS 8-3A 1,800
8-3B 10RV Park Commercial 100/Site 18 Sites 1,800
Total Design Wastewater Flow to Size OWTS 8-3B 1,800
8-4 9Retreat Commercial 50/Room 12 Rooms 600
9Cabins Commercial 50/Cabin 13 Cabins 650
Total Design Wastewater Flow to Size OWTS 8-4 1,250
8-5A 4Music Festival Commercial 5/Visitor 350 1,750
Total Design Wastewater Flow to Size OWTS 8-5A 1,750
8-5B 4Performing Arts Center Commercial 5/Visitor 100 500
Total Daily Design Flow to Area 8-5B 500
TOTAL DESIGN FLOW FOR AREA 8 9,455
Nutrient Farm September 2021
OWTS Preliminary Analysis and Design 11
1 Table 6-1 of Reg43 – 5 bedroom home.
2 Table 6-2 of Reg43 – Stores and shopping centers.
3 Table 6-2 of Reg43 – Factories and plants exclusive of industrial wastewater per employee
per eight-hour shift with no showers.
4 Table 6-2 of Reg43 – Facilities with short term or transient visitors.
5 Table 6-2 of Reg43 – Restaurant open for 1 or 2 meals per day.
6 Table 6-2 of Reg43 – Office Building per employee per 8 hour shift.
7 Table 6-2 of Reg43 – Swimming pools and bathhouses.
8 Table 6-2 of Reg43 – Self-service laundry per machine.
9 Table 6-2 of Reg43 – Resort night and day or Campground per camp site.
10 Table 6-2 of Reg43 – Travel trailer park with individual water and sewage hookup per site.
11 This water will not be discharged to a soil treatment area, but use will be applied for under
Regulation 84 – Reclaimed Water Control Regulation.
The daily wastewater design flow estimates presented in Table 2 are at full development.
Figure 2 depicts the areas associated with the proposed development.
Job No.Drawn by:Date:File:PE:QC:Graphic Scale
In Feet: 1" = 2000'
0 1000 2000 4000
Proposed Land Use2018-271.002TLB06/07/2021DKOWTS-Prelim-Design-PlanDK2118 West Sixth Street, Suite 200Glenwood Springs, CO 81601970.945.1004 www.sgm-inc.com FIG
Nutrient Farm September 2021
OWTS Preliminary Analysis and Design 13
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OWTS Preliminary Analysis and Design 14
Requirements for this preliminary design based on treatment level 1 (TL-1) for soil units 29
or 30 are shown in the following table.
Septic Tank
(gal.)
STA
(ft2)
No. Chambers
(dependent on
12ft2/chamber)
1Pump
2Automatic
Distribution
Valve (ATV)
1,500 2,240 187 Yes (1) x 4
1Spacing and sizing of orifices in the distribution pipe and sizing for the pump must
be such that a 30-72 inch operating head is present at the distal end orifice. In
addition, orifice spacing and sizing will not cause more than a 10% flow differential
between the initial orifice to the most distal end orifice.
2The ATV should be (1) with 4 outlets.
If the STA for this land use is located in NRCS soil unit 51, which has a soil type
classification of 2A and a LTAR of 0.50, the size of the STA, prior to any allowed reductions,
will be 1,200 square feet (600 gpd/0.50 g/d/ft2).
The best design for the STA in this soil type is:
· Use of a trench type treatment area for the STA.
· Use of pressure dosing as the method of effluent application.
· Use of chambers as the type of distribution media in the STA.
Pressure dosing to a trench STA will allow for a reduction factor of 0.8 and using chambers
in the STA will allow for a reduction factor of 0.7. Applying these reduction factors to the size
of the STA will allow the STA to be reduced to 672 square feet, which will require 56
chambers (12 square feet/chamber).
Requirements for this preliminary design based on TL-1 are shown in the following table.
1Septic Tanks
(gal.)
STA
(ft2)
No. Chambers
(dependent on
12ft2/chamber)
2Pump
3Automatic
Distribution
Valve (ATV)
1,500 672 56 Yes (1) x 2
1Spacing and sizing of orifices in the distribution pipe and sizing for the pump must
be such that a 30-72 inch operating head is present at the distal end orifice. In
addition, orifice spacing and sizing will not cause more than a 10% flow differential
between the initial orifice to the most distal end orifice.
2The ATV should be (1) with 2 outlets.
Job No.Drawn by:Date:File:PE:QC:Graphic Scale
In Feet: 1" = 500'
0 250 500 1000
Preliminary OWTS f0r LandUse Area 52018-271.002TLB06/07/2021DKOWTS-Prelim-Design-PlanDK3118 West Sixth Street, Suite 200Glenwood Springs, CO 81601970.945.1004 www.sgm-inc.com FIG
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OWTS Preliminary Analysis and Design 16
4.3 Land Use Area 6
There are 3 preliminary OWTS designs for land use area 6.
Job No.Drawn by:Date:File:PE:QC:Graphic Scale
In Feet: 1" = 100'
0 50 100 200 Preliminary OWTS for LandUse Areas 6-1 and 6-22018-271.002TLB06/07/2021DKOWTS-Prelim-Design-PlanDK4118 West Sixth Street, Suite 200Glenwood Springs, CO 81601970.945.1004 www.sgm-inc.com FIG
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Job No.Drawn by:Date:File:PE:QC:Graphic Scale
In Feet: 1" = 50'
0 25 50 100
Preliminary OWTS for LandUse Area 6-32018-271.002TLB06/07/2021DKOWTS-Prelim-Design-PlanDK5118 West Sixth Street, Suite 200Glenwood Springs, CO 81601970.945.1004 www.sgm-inc.com FIG
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OWTS Preliminary Analysis and Design 20
4.4 Land Use Area 7
Professional, commercial and retail buildings are proposed to be constructed in land use
area 7. The daily design flow rate at full development for this land use area is calculated to
be 1,000 gallons per day. The STA for this land use will be located in NRCS soil unit 51,
which has a soil type classification of 2A and a LTAR of 0.50. The size of the STA, prior to
any allowed reductions, will be 2,000 square feet (1,000 gpd/0.50 g/d/ft2).
The best design for the STA in this soil type is:
· Use of a trench type treatment area for the STA.
· Use of pressure dosing as the method of effluent application.
· Use of chambers as the type of distribution media in the STA.
Pressure dosing to a trench STA will allow for a reduction factor of 0.8 and using chambers
in the STA will allow for a reduction factor of 0.7. Applying these reduction factors to the size
of the STA will allow for the STA to be reduced to 1,120 square feet, which will require 94
chambers (12 square feet/chamber).
Requirements for this preliminary design based on TL-1 are shown in the following table.
1Septic Tanks
(gal.)
STA
(ft2)
No. Chambers
(dependent on
12ft2/chamber)
2Pump
3Automatic
Distribution
Valve (ATV)
(1) @ 2,000 1,120 94 Yes (1) x 4
1Tank is sized to permit detention for a minimum of 48 hours.
2Spacing and sizing of orifices in the distribution pipe and sizing for the pump must
be such that a 30-72 inch operating head is present at the distal end orifice. In
addition, orifice spacing and sizing will not cause more than a 10% flow differential
between the initial orifice to the most distal end orifice.
3The ATV should be (1) with 4 outlets.
Job No.Drawn by:Date:File:PE:QC:Graphic Scale
In Feet: 1" = 50'
0 25 50 100
Preliminary OWTS for LandUse Area 7-12018-271.002TLB06/07/2021DKOWTS-Prelim-Design-PlanDK6118 West Sixth Street, Suite 200Glenwood Springs, CO 81601970.945.1004 www.sgm-inc.com FIG
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4.5 Land Use Area 8
Proposed land use area 8 will require six OWTSs to serve proposed uses.
Job No.Drawn by:Date:File:PE:QC:Graphic Scale
In Feet: 1" = 50'
0 25 50 100
Preliminary OWTS for LandUse Area 8-12018-271.002TLB06/07/2021DKOWTS-Prelim-Design-Plan`DK7118 West Sixth Street, Suite 200Glenwood Springs, CO 81601970.945.1004 www.sgm-inc.com FIG
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OWTS Preliminary Analysis and Design 24
Job No.Drawn by:Date:File:PE:QC:Graphic Scale
In Feet: 1" = 50'
0 25 50 100
Preliminary OWTS for LandUse Area 8-22018-271.002TLB06/07/2021DKOWTS-Prelim-Design-PlanDK8118 West Sixth Street, Suite 200Glenwood Springs, CO 81601970.945.1004 www.sgm-inc.com FIG
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OWTS Preliminary Analysis and Design 26
Job No.Drawn by:Date:File:PE:QC:Graphic Scale
In Feet: 1" = 50'
0 25 50 100
Preliminary OWTS for LandUse Area 8-3A2018-271.002TLB06/07/2021DKOWTS-Prelim-Design-PlanDK9118 West Sixth Street, Suite 200Glenwood Springs, CO 81601970.945.1004 www.sgm-inc.com FIG
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OWTS Preliminary Analysis and Design 28
Job No.Drawn by:Date:File:PE:QC:Graphic Scale
In Feet: 1" = 50'
0 25 50 100 Preliminary OWTS for LandUse Area 8-3B2018-271.002TLB06/07/2021DKOWTS-Prelim-Design-PlanDK10118 West Sixth Street, Suite 200Glenwood Springs, CO 81601970.945.1004 www.sgm-inc.com FIG
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OWTS Preliminary Analysis and Design 30
Job No.Drawn by:Date:File:PE:QC:Graphic Scale
In Feet: 1" = 100'
0 50 100 200 Preliminary OWTS for LandUse Area 8-42018-271.002TLB06/07/2021DKOWTS-Prelim-Design-PlanDK11118 West Sixth Street, Suite 200Glenwood Springs, CO 81601970.945.1004 www.sgm-inc.com FIG
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Job No.Drawn by:Date:File:PE:QC:Graphic Scale
In Feet: 1" = 100'
0 50 100 200 Preliminary OWTS for LandUse Area 8-5A2018-271.002TLB06/07/2021TLBOWTS-Prelim-Design-PlanDK12118 West Sixth Street, Suite 200Glenwood Springs, CO 81601970.945.1004 www.sgm-inc.com FIG
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Job No.Drawn by:Date:File:PE:QC:Graphic Scale
In Feet: 1" = 100'
0 50 100 200 Preliminary OWTS for LandUse Area 8-5B2018-271.002TLB06/07/2021TLBOWTS-Prelim-Design-PlanDK13118 West Sixth Street, Suite 200Glenwood Springs, CO 81601970.945.1004 www.sgm-inc.com FIG
Nutrient Farm September 2021
Appendix JJ
Appendix
NRCS Soil Data – Percent Silt
NRCS Soil Data – Percent Sand
NRCS Soil Data – Percent Clay
NRCS Soil Unit 29 and 30 USDA Textural Triangle
NRCS Soil Unit 47 and 51 USDA Textural Triangle
NRCS Soil Data – Depth to any Restrictive Layer
NRCS Soil Data – Septic Tank Absorption Fields
NRCS Soil Data - Percent Silt
Percent Silt—Rifle Area, Colorado, Parts of Garfield and Mesa Counties
(Nutrient Farms)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 1 of 443814004381800438220043826004383000438340043838004381400438180043822004382600438300043834004383800285200285600286000286400286800287200287600288000288400288800289200
285200 285600 286000 286400 286800 287200 287600 288000 288400 288800 289200
39° 34' 44'' N 107° 30' 7'' W39° 34' 44'' N107° 27' 11'' W39° 33' 16'' N
107° 30' 7'' W39° 33' 16'' N
107° 27' 11'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 500 1000 2000 3000
Feet
0 250 500 1000 1500
Meters
Map Scale: 1:19,200 if printed on A landscape (11" x 8.5") sheet.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
<= 1.5
> 1.5 and <= 19.6
> 19.6 and <= 29.2
> 29.2 and <= 37.9
> 37.9 and <= 67.1
Not rated or not available
Soil Rating Lines
<= 1.5
> 1.5 and <= 19.6
> 19.6 and <= 29.2
> 29.2 and <= 37.9
> 37.9 and <= 67.1
Not rated or not available
Soil Rating Points
<= 1.5
> 1.5 and <= 19.6
> 19.6 and <= 29.2
> 29.2 and <= 37.9
> 37.9 and <= 67.1
Not rated or not available
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Rifle Area, Colorado, Parts of Garfield and
Mesa Counties
Survey Area Data: Version 13, Jun 5, 2020
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Jul 14, 2010—Nov 1,
2017
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Percent Silt—Rifle Area, Colorado, Parts of Garfield and Mesa Counties
(Nutrient Farms)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 2 of 4
Percent Silt
Map unit symbol Map unit name Rating (percent)Acres in AOI Percent of AOI
8 Atencio-Azeltine
complex, 1 to 3
percent slopes
1.5 46.3 2.5%
10 Begay sandy loam, 1 to
6 percent slopes
19.6 225.1 12.3%
11 Begay sandy loam, 6 to
12 percent slopes
19.6 44.2 2.4%
14 Chilton channery loam,
6 to 12 percent slopes
19.2 105.9 5.8%
15 Chilton channery loam,
12 to 25 percent
slopes
19.2 41.1 2.2%
21 Cushman-Lazear stony
loams, 15 to 65
percent slopes
86.4 4.7%
29 Heldt clay loam, 3 to 6
percent slopes
29.2 114.9 6.3%
30 Heldt clay loam, 6 to 12
percent slopes
29.2 209.1 11.4%
35 Ildefonso-Lazear
complex, 6 to 65
percent slopes
37.9 4.8 0.3%
47 Nihill channery loam, 6
to 25 percent slopes
154.1 8.4%
51 Olney loam, 6 to 12
percent slopes
15.0 44.5 2.4%
57 Potts-Ildefonso complex,
3 to 12 percent slopes
37.9 2.6 0.1%
65 Torrifluvents, nearly
level
1.5 8.8 0.5%
66 Torriorthents-
Camborthids-Rock
outcrop complex,
steep
229.9 12.5%
67 Torriorthents-Rock
outcrop complex,
steep
285.9 15.6%
69 Vale silt loam, 6 to 12
percent slopes
67.1 183.9 10.0%
73 Water 46.9 2.6%
Totals for Area of Interest 1,834.3 100.0%
Percent Silt—Rifle Area, Colorado, Parts of Garfield and Mesa Counties Nutrient Farms
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 3 of 4
Description
Silt as a soil separate consists of mineral soil particles that are 0.002 to 0.05
millimeter in diameter. In the database, the estimated silt 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
For each soil layer, this attribute is actually recorded as three separate values in
the database. A low value and a high value indicate the range of this attribute for
the soil component. A "representative" value indicates the expected value of this
attribute for the component. For this soil property, only the representative value is
used.
Rating Options
Units of Measure: percent
Aggregation Method: Dominant Component
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
Interpret Nulls as Zero: No
Layer Options (Horizon Aggregation Method): Depth Range (Weighted Average)
Top Depth: 48
Bottom Depth: 96
Units of Measure: Inches
Percent Silt—Rifle Area, Colorado, Parts of Garfield and Mesa Counties Nutrient Farms
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 4 of 4
NRCS Soil Data - Percent Sand
Percent Sand—Rifle Area, Colorado, Parts of Garfield and Mesa Counties
(Nutrient Farms)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 1 of 443814004381800438220043826004383000438340043838004381400438180043822004382600438300043834004383800285200285600286000286400286800287200287600288000288400288800289200
285200 285600 286000 286400 286800 287200 287600 288000 288400 288800 289200
39° 34' 44'' N 107° 30' 7'' W39° 34' 44'' N107° 27' 11'' W39° 33' 16'' N
107° 30' 7'' W39° 33' 16'' N
107° 27' 11'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 500 1000 2000 3000
Feet
0 250 500 1000 1500
Meters
Map Scale: 1:19,200 if printed on A landscape (11" x 8.5") sheet.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
<= 9.4
> 9.4 and <= 23.3
> 23.3 and <= 42.1
> 42.1 and <= 67.9
> 67.9 and <= 97.0
Not rated or not available
Soil Rating Lines
<= 9.4
> 9.4 and <= 23.3
> 23.3 and <= 42.1
> 42.1 and <= 67.9
> 67.9 and <= 97.0
Not rated or not available
Soil Rating Points
<= 9.4
> 9.4 and <= 23.3
> 23.3 and <= 42.1
> 42.1 and <= 67.9
> 67.9 and <= 97.0
Not rated or not available
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Rifle Area, Colorado, Parts of Garfield and
Mesa Counties
Survey Area Data: Version 13, Jun 5, 2020
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Jul 14, 2010—Nov 1,
2017
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Percent Sand—Rifle Area, Colorado, Parts of Garfield and Mesa Counties
(Nutrient Farms)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 2 of 4
Percent Sand
Map unit symbol Map unit name Rating (percent)Acres in AOI Percent of AOI
8 Atencio-Azeltine
complex, 1 to 3
percent slopes
95.0 46.3 2.5%
10 Begay sandy loam, 1 to
6 percent slopes
67.9 225.1 12.3%
11 Begay sandy loam, 6 to
12 percent slopes
67.9 44.2 2.4%
14 Chilton channery loam,
6 to 12 percent slopes
66.8 105.9 5.8%
15 Chilton channery loam,
12 to 25 percent
slopes
66.8 41.1 2.2%
21 Cushman-Lazear stony
loams, 15 to 65
percent slopes
86.4 4.7%
29 Heldt clay loam, 3 to 6
percent slopes
23.3 114.9 6.3%
30 Heldt clay loam, 6 to 12
percent slopes
23.3 209.1 11.4%
35 Ildefonso-Lazear
complex, 6 to 65
percent slopes
42.1 4.8 0.3%
47 Nihill channery loam, 6
to 25 percent slopes
154.1 8.4%
51 Olney loam, 6 to 12
percent slopes
66.0 44.5 2.4%
57 Potts-Ildefonso complex,
3 to 12 percent slopes
42.1 2.6 0.1%
65 Torrifluvents, nearly
level
97.0 8.8 0.5%
66 Torriorthents-
Camborthids-Rock
outcrop complex,
steep
229.9 12.5%
67 Torriorthents-Rock
outcrop complex,
steep
285.9 15.6%
69 Vale silt loam, 6 to 12
percent slopes
9.4 183.9 10.0%
73 Water 46.9 2.6%
Totals for Area of Interest 1,834.3 100.0%
Percent Sand—Rifle Area, Colorado, Parts of Garfield and Mesa Counties Nutrient Farms
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 3 of 4
Description
Sand as a soil separate consists of mineral soil particles that are 0.05 millimeter
to 2 millimeters in diameter. In the database, 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. 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.
For each soil layer, this attribute is actually recorded as three separate values in
the database. A low value and a high value indicate the range of this attribute for
the soil component. A "representative" value indicates the expected value of this
attribute for the component. For this soil property, only the representative value is
used.
Rating Options
Units of Measure: percent
Aggregation Method: Dominant Component
Component Percent Cutoff: None Specified
Tie-break Rule: Higher
Interpret Nulls as Zero: No
Layer Options (Horizon Aggregation Method): Depth Range (Weighted Average)
Top Depth: 48
Bottom Depth: 96
Units of Measure: Inches
Percent Sand—Rifle Area, Colorado, Parts of Garfield and Mesa Counties Nutrient Farms
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 4 of 4
NRCS Soil Data - Percent Clay
Percent Clay—Rifle Area, Colorado, Parts of Garfield and Mesa Counties
(Nutrient Farms)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 1 of 543814004381800438220043826004383000438340043838004381400438180043822004382600438300043834004383800285200285600286000286400286800287200287600288000288400288800289200
285200 285600 286000 286400 286800 287200 287600 288000 288400 288800 289200
39° 34' 44'' N 107° 30' 7'' W39° 34' 44'' N107° 27' 11'' W39° 33' 16'' N
107° 30' 7'' W39° 33' 16'' N
107° 27' 11'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 500 1000 2000 3000
Feet
0 250 500 1000 1500
Meters
Map Scale: 1:19,200 if printed on A landscape (11" x 8.5") sheet.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
<= 3.5
> 3.5 and <= 14.0
> 14.0 and <= 21.0
> 21.0 and <= 23.5
> 23.5 and <= 47.5
Not rated or not available
Soil Rating Lines
<= 3.5
> 3.5 and <= 14.0
> 14.0 and <= 21.0
> 21.0 and <= 23.5
> 23.5 and <= 47.5
Not rated or not available
Soil Rating Points
<= 3.5
> 3.5 and <= 14.0
> 14.0 and <= 21.0
> 21.0 and <= 23.5
> 23.5 and <= 47.5
Not rated or not available
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Rifle Area, Colorado, Parts of Garfield and
Mesa Counties
Survey Area Data: Version 13, Jun 5, 2020
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Jul 14, 2010—Nov 1,
2017
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Percent Clay—Rifle Area, Colorado, Parts of Garfield and Mesa Counties
(Nutrient Farms)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 2 of 5
Percent Clay
Map unit symbol Map unit name Rating (percent)Acres in AOI Percent of AOI
8 Atencio-Azeltine
complex, 1 to 3
percent slopes
3.5 46.3 2.5%
10 Begay sandy loam, 1 to
6 percent slopes
12.5 225.1 12.3%
11 Begay sandy loam, 6 to
12 percent slopes
12.5 44.2 2.4%
14 Chilton channery loam,
6 to 12 percent slopes
14.0 105.9 5.8%
15 Chilton channery loam,
12 to 25 percent
slopes
14.0 41.1 2.2%
21 Cushman-Lazear stony
loams, 15 to 65
percent slopes
86.4 4.7%
29 Heldt clay loam, 3 to 6
percent slopes
47.5 114.9 6.3%
30 Heldt clay loam, 6 to 12
percent slopes
47.5 209.1 11.4%
35 Ildefonso-Lazear
complex, 6 to 65
percent slopes
20.0 4.8 0.3%
47 Nihill channery loam, 6
to 25 percent slopes
21.0 154.1 8.4%
51 Olney loam, 6 to 12
percent slopes
19.0 44.5 2.4%
57 Potts-Ildefonso complex,
3 to 12 percent slopes
20.0 2.6 0.1%
65 Torrifluvents, nearly
level
1.5 8.8 0.5%
66 Torriorthents-
Camborthids-Rock
outcrop complex,
steep
229.9 12.5%
67 Torriorthents-Rock
outcrop complex,
steep
285.9 15.6%
69 Vale silt loam, 6 to 12
percent slopes
23.5 183.9 10.0%
73 Water 46.9 2.6%
Totals for Area of Interest 1,834.3 100.0%
Percent Clay—Rifle Area, Colorado, Parts of Garfield and Mesa Counties Nutrient Farms
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 3 of 5
Description
Clay as a soil separate consists of mineral soil particles that are less than 0.002
millimeter in diameter. 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 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 earth-moving operations.
Most of the material is in one of three groups of clay minerals or a mixture of
these clay minerals. The groups are kaolinite, smectite, and hydrous mica, the
best known member of which is illite.
For each soil layer, this attribute is actually recorded as three separate values in
the database. A low value and a high value indicate the range of this attribute for
the soil component. A "representative" value indicates the expected value of this
attribute for the component. For this soil property, only the representative value is
used.
Rating Options
Units of Measure: percent
Aggregation Method: Dominant Component
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.g., rock outcrop. For the
attribute being aggregated, the first step of the aggregation process is to derive
one attribute value for each of a map unit's components. From this set of
component attributes, the next step of the aggregation process derives a single
value that represents the map unit as a whole. Once a single value for each map
unit is derived, a thematic map for soil map units can be rendered. Aggregation
must be done because, on any soil map, map units are delineated but
components are not.
For each of a map unit's components, a corresponding percent composition is
recorded. A percent composition of 60 indicates that the corresponding
component typically makes up approximately 60% of the map unit. Percent
composition is a critical factor in some, but not all, aggregation methods.
The aggregation method "Dominant Component" returns the attribute value
associated with the component with the highest percent composition in the map
unit. If more than one component shares the highest percent composition, the
corresponding "tie-break" rule determines which value should be returned. The
"tie-break" rule indicates whether the lower or higher attribute value should be
returned in the case of a percent composition tie. The result returned by this
aggregation method may or may not represent the dominant condition throughout
the map unit.
Percent Clay—Rifle Area, Colorado, Parts of Garfield and Mesa Counties Nutrient Farms
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 4 of 5
Component Percent Cutoff: None Specified
Components whose percent composition is below the cutoff value will not be
considered. If no cutoff value is specified, all components in the database will be
considered. The data for some contrasting soils of minor extent may not be in the
database, and therefore are not considered.
Tie-break Rule: Higher
The tie-break rule indicates which value should be selected from a set of multiple
candidate values, or which value should be selected in the event of a percent
composition tie.
Interpret Nulls as Zero: No
This option indicates if a null value for a component should be converted to zero
before aggregation occurs. This will be done only if a map unit has at least one
component where this value is not null.
Layer Options (Horizon Aggregation Method): Depth Range (Weighted Average)
For an attribute of a soil horizon, a depth qualification must be specified. In most
cases it is probably most appropriate to specify a fixed depth range, either in
centimeters or inches. The Bottom Depth must be greater than the Top Depth,
and the Top Depth can be greater than zero. The choice of "inches" or
"centimeters" only applies to the depth of soil to be evaluated. It has no influence
on the units of measure the data are presented in.
When "Surface Layer" is specified as the depth qualifier, only the surface layer or
horizon is considered when deriving a value for a component, but keep in mind
that the thickness of the surface layer varies from component to component.
When "All Layers" is specified as the depth qualifier, all layers recorded for a
component are considered when deriving the value for that component.
Whenever more than one layer or horizon is considered when deriving a value
for a component, and the attribute being aggregated is a numeric attribute, a
weighted average value is returned, where the weighting factor is the layer or
horizon thickness.
Top Depth: 48
Bottom Depth: 96
Units of Measure: Inches
Percent Clay—Rifle Area, Colorado, Parts of Garfield and Mesa Counties Nutrient Farms
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 5 of 5
NRCS Soil Unit 29 and 30 USDA
Textural Triangle
NRCS Soil Units 29 & 30
NRCS Soil Unit 47 and 51 USDA
Textural Triangle
NRCS Soil Units Assumed 47 & 51
NRCS Soil Data - Depth to any
Restrictive Layer
Depth to Any Soil Restrictive Layer—Rifle Area, Colorado, Parts of Garfield and Mesa Counties
(Nutrient Farms)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 1 of 443814004381800438220043826004383000438340043838004381400438180043822004382600438300043834004383800285200285600286000286400286800287200287600288000288400288800289200
285200 285600 286000 286400 286800 287200 287600 288000 288400 288800 289200
39° 34' 44'' N 107° 30' 7'' W39° 34' 44'' N107° 27' 11'' W39° 33' 16'' N
107° 30' 7'' W39° 33' 16'' N
107° 27' 11'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 500 1000 2000 3000
Feet
0 250 500 1000 1500
Meters
Map Scale: 1:19,200 if printed on A landscape (11" x 8.5") sheet.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
0 - 25
25 - 50
50 - 100
100 - 150
150 - 200
> 200
Not rated or not available
Soil Rating Lines
0 - 25
25 - 50
50 - 100
100 - 150
150 - 200
> 200
Not rated or not available
Soil Rating Points
0 - 25
25 - 50
50 - 100
100 - 150
150 - 200
> 200
Not rated or not available
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Rifle Area, Colorado, Parts of Garfield and
Mesa Counties
Survey Area Data: Version 13, Jun 5, 2020
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Jul 14, 2010—Nov 1,
2017
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Depth to Any Soil Restrictive Layer—Rifle Area, Colorado, Parts of Garfield and Mesa Counties
(Nutrient Farms)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 2 of 4
Depth to Any Soil Restrictive Layer
Map unit symbol Map unit name Rating (centimeters)Acres in AOI Percent of AOI
8 Atencio-Azeltine
complex, 1 to 3
percent slopes
>200 46.3 2.5%
10 Begay sandy loam, 1 to
6 percent slopes
>200 225.1 12.3%
11 Begay sandy loam, 6 to
12 percent slopes
>200 44.2 2.4%
14 Chilton channery loam,
6 to 12 percent slopes
>200 105.9 5.8%
15 Chilton channery loam,
12 to 25 percent
slopes
>200 41.1 2.2%
21 Cushman-Lazear stony
loams, 15 to 65
percent slopes
77 86.4 4.7%
29 Heldt clay loam, 3 to 6
percent slopes
>200 114.9 6.3%
30 Heldt clay loam, 6 to 12
percent slopes
>200 209.1 11.4%
35 Ildefonso-Lazear
complex, 6 to 65
percent slopes
>200 4.8 0.3%
47 Nihill channery loam, 6
to 25 percent slopes
>200 154.1 8.4%
51 Olney loam, 6 to 12
percent slopes
>200 44.5 2.4%
57 Potts-Ildefonso complex,
3 to 12 percent slopes
>200 2.6 0.1%
65 Torrifluvents, nearly
level
>200 8.8 0.5%
66 Torriorthents-
Camborthids-Rock
outcrop complex,
steep
43 229.9 12.5%
67 Torriorthents-Rock
outcrop complex,
steep
43 285.9 15.6%
69 Vale silt loam, 6 to 12
percent slopes
>200 183.9 10.0%
73 Water >200 46.9 2.6%
Totals for Area of Interest 1,834.3 100.0%
Depth to Any Soil Restrictive Layer—Rifle Area, Colorado, Parts of Garfield and Mesa
Counties
Nutrient Farms
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 3 of 4
Description
A "restrictive layer" is a nearly continuous layer that has one or more physical,
chemical, or thermal properties that significantly impede the movement of water
and air through the soil or that restrict roots or otherwise provide an unfavorable
root environment. Examples are bedrock, cemented layers, dense layers, and
frozen layers.
This theme presents the depth to any type of restrictive layer that is described for
each map unit. If more than one type of restrictive layer is described for an
individual soil type, the depth to the shallowest one is presented. If no restrictive
layer is described in a map unit, it is represented by the "> 200" depth class.
This attribute is actually recorded as three separate values in the database. A
low value and a high value indicate the range of this attribute for the soil
component. A "representative" value indicates the expected value of this attribute
for the component. For this soil property, only the representative value is used.
Rating Options
Units of Measure: centimeters
Aggregation Method: Dominant Component
Component Percent Cutoff: None Specified
Tie-break Rule: Lower
Interpret Nulls as Zero: No
Depth to Any Soil Restrictive Layer—Rifle Area, Colorado, Parts of Garfield and Mesa
Counties
Nutrient Farms
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 4 of 4
NRCS Soil Data - Septic Tank Absorption Fields
Septic Tank Absorption Fields—Rifle Area, Colorado, Parts of Garfield and Mesa Counties
(Nutrient Farms)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 1 of 743814004381800438220043826004383000438340043838004381400438180043822004382600438300043834004383800285200285600286000286400286800287200287600288000288400288800289200
285200 285600 286000 286400 286800 287200 287600 288000 288400 288800 289200
39° 34' 44'' N 107° 30' 7'' W39° 34' 44'' N107° 27' 11'' W39° 33' 16'' N
107° 30' 7'' W39° 33' 16'' N
107° 27' 11'' WN
Map projection: Web Mercator Corner coordinates: WGS84 Edge tics: UTM Zone 13N WGS84
0 500 1000 2000 3000
Feet
0 250 500 1000 1500
Meters
Map Scale: 1:19,200 if printed on A landscape (11" x 8.5") sheet.
MAP LEGEND MAP INFORMATION
Area of Interest (AOI)
Area of Interest (AOI)
Soils
Soil Rating Polygons
Very limited
Somewhat limited
Not limited
Not rated or not available
Soil Rating Lines
Very limited
Somewhat limited
Not limited
Not rated or not available
Soil Rating Points
Very limited
Somewhat limited
Not limited
Not rated or not available
Water Features
Streams and Canals
Transportation
Rails
Interstate Highways
US Routes
Major Roads
Local Roads
Background
Aerial Photography
The soil surveys that comprise your AOI were mapped at
1:24,000.
Please rely on the bar scale on each map sheet for map
measurements.
Source of Map: Natural Resources Conservation Service
Web Soil Survey URL:
Coordinate System: Web Mercator (EPSG:3857)
Maps from the Web Soil Survey are based on the Web Mercator
projection, which preserves direction and shape but distorts
distance and area. A projection that preserves area, such as the
Albers equal-area conic projection, should be used if more
accurate calculations of distance or area are required.
This product is generated from the USDA-NRCS certified data as
of the version date(s) listed below.
Soil Survey Area: Rifle Area, Colorado, Parts of Garfield and
Mesa Counties
Survey Area Data: Version 13, Jun 5, 2020
Soil map units are labeled (as space allows) for map scales
1:50,000 or larger.
Date(s) aerial images were photographed: Jul 14, 2010—Nov 1,
2017
The orthophoto or other base map on which the soil lines were
compiled and digitized probably differs from the background
imagery displayed on these maps. As a result, some minor
shifting of map unit boundaries may be evident.
Septic Tank Absorption Fields—Rifle Area, Colorado, Parts of Garfield and Mesa Counties
(Nutrient Farms)
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 2 of 7
Septic Tank Absorption Fields
Map unit
symbol
Map unit name Rating Component
name (percent)
Rating reasons
(numeric
values)
Acres in AOI Percent of AOI
8 Atencio-Azeltine
complex, 1 to
3 percent
slopes
Somewhat
limited
Atencio (50%)Large stones
(0.01)
46.3 2.5%
10 Begay sandy
loam, 1 to 6
percent slopes
Not limited Begay (90%)225.1 12.3%
11 Begay sandy
loam, 6 to 12
percent slopes
Somewhat
limited
Begay (90%)Large stones
(0.17)
44.2 2.4%
Slope (0.04)
14 Chilton channery
loam, 6 to 12
percent slopes
Somewhat
limited
Chilton (85%)Large stones
(0.48)
105.9 5.8%
Slope (0.04)
15 Chilton channery
loam, 12 to 25
percent slopes
Very limited Chilton (85%)Slope (1.00)41.1 2.2%
Large stones
(0.48)
21 Cushman-
Lazear stony
loams, 15 to
65 percent
slopes
Very limited Cushman (45%)Slope (1.00)86.4 4.7%
Depth to bedrock
(1.00)
Lazear (40%)Depth to bedrock
(1.00)
Slope (1.00)
Large stones
(0.47)
29 Heldt clay loam,
3 to 6 percent
slopes
Very limited Heldt (90%)Slow water
movement
(1.00)
114.9 6.3%
30 Heldt clay loam,
6 to 12
percent slopes
Very limited Heldt (90%)Slow water
movement
(1.00)
209.1 11.4%
Slope (0.04)
35 Ildefonso-Lazear
complex, 6 to
65 percent
slopes
Very limited Ildefonso (50%)Slope (1.00)4.8 0.3%
Large stones
(1.00)
Lazear (30%)Depth to bedrock
(1.00)
Slope (1.00)
Large stones
(0.06)
Septic Tank Absorption Fields—Rifle Area, Colorado, Parts of Garfield and Mesa Counties Nutrient Farms
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 3 of 7
Map unit
symbol
Map unit name Rating Component
name (percent)
Rating reasons
(numeric
values)
Acres in AOI Percent of AOI
47 Nihill channery
loam, 6 to 25
percent slopes
Very limited Nihill (85%)Slope (1.00)154.1 8.4%
Large stones
(0.05)
51 Olney loam, 6 to
12 percent
slopes
Somewhat
limited
Olney (85%)Slow water
movement
(0.47)
44.5 2.4%
Slope (0.04)
57 Potts-Ildefonso
complex, 3 to
12 percent
slopes
Very limited Potts (60%)Slow water
movement
(1.00)
2.6 0.1%
Ildefonso (30%)Large stones
(1.00)
Slope (0.04)
65 Torrifluvents,
nearly level
Very limited Torrifluvents
(85%)
Flooding (1.00)8.8 0.5%
Depth to
saturated zone
(1.00)
Slow water
movement
(0.47)
66 Torriorthents-
Camborthids-
Rock outcrop
complex,
steep
Very limited Torriorthents,
steep (45%)
Depth to bedrock
(1.00)
229.9 12.5%
Slope (1.00)
Camborthids,
steep (20%)
Slow water
movement
(1.00)
Slope (1.00)
Depth to bedrock
(1.00)
67 Torriorthents-
Rock outcrop
complex,
steep
Very limited Torriorthents,
steep (60%)
Depth to bedrock
(1.00)
285.9 15.6%
Slope (1.00)
69 Vale silt loam, 6
to 12 percent
slopes
Very limited Vale (90%)Slow water
movement
(1.00)
183.9 10.0%
Slope (0.04)
73 Water Not rated Water (100%)46.9 2.6%
Totals for Area of Interest 1,834.3 100.0%
Rating Acres in AOI Percent of AOI
Very limited 1,321.5 72.0%
Somewhat limited 240.9 13.1%
Not limited 225.1 12.3%
Septic Tank Absorption Fields—Rifle Area, Colorado, Parts of Garfield and Mesa Counties Nutrient Farms
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 4 of 7
Rating Acres in AOI Percent of AOI
Null or Not Rated 46.9 2.6%
Totals for Area of Interest 1,834.3 100.0%
Septic Tank Absorption Fields—Rifle Area, Colorado, Parts of Garfield and Mesa Counties Nutrient Farms
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 5 of 7
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. In 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.
Septic Tank Absorption Fields—Rifle Area, Colorado, Parts of Garfield and Mesa Counties Nutrient Farms
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 6 of 7
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.g., rock outcrop. For the
attribute being aggregated, the first step of the aggregation process is to derive
one attribute value for each of a map unit's components. From this set of
component attributes, the next step of the aggregation process derives a single
value that represents the map unit as a whole. Once a single value for each map
unit is derived, a thematic map for soil map units can be rendered. Aggregation
must be done because, on any soil map, map units are delineated but
components are not.
For each of a map unit's components, a corresponding percent composition is
recorded. A percent composition of 60 indicates that the corresponding
component typically makes up approximately 60% of the map unit. Percent
composition is a critical factor in some, but not all, aggregation methods.
The aggregation method "Dominant Condition" first groups like attribute values
for the components in a map unit. For each group, percent composition is set to
the sum of the percent composition of all components participating in that group.
These groups now represent "conditions" rather than components. The attribute
value associated with the group with the highest cumulative percent composition
is returned. If 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. If no cutoff value is specified, all components in the database will be
considered. The data for some contrasting soils of minor extent may not be in the
database, and therefore are not considered.
Tie-break Rule: Higher
The tie-break rule indicates which value should be selected from a set of multiple
candidate values, or which value should be selected in the event of a percent
composition tie.
Septic Tank Absorption Fields—Rifle Area, Colorado, Parts of Garfield and Mesa Counties Nutrient Farms
Natural Resources
Conservation Service
Web Soil Survey
National Cooperative Soil Survey
12/16/2020
Page 7 of 7
Nutrient Farm P.U.D. September 2021
Appendix B
Appendix B
WQSA-6
Nutrient Farm P.U.D. September 2021
Appendix C
Appendix C
HIA Calculations
HIA = 100 + [(DF - 1000) / 100] x 8
OWTS
I.D.Design Capacity (gpd)Design Flow (1.5 x DC)Horizontal Influence Area (HIA)
2 600 900 92
5 600 900 92
6-1/6-2 10145 15217.5 1237.4
6-3 590 885 90.8
7-1 1000 1500 140
8-1 805 1207.5 116.6
8-2 1550 2325 206
8-3A 1800 2700 236
8-3B 1800 2700 236
8-4 1250 1875 170
8-5A 1750 2625 230
8-5B 500 750 80