HomeMy WebLinkAbout20191196.tiffNORTH WELD COUNTY WATER DISTRICT
32825 CR 39 • LUCERNE, CO 80646
P.O. BOX 56 • BUS: 970-356-3020 • FAX: 970-395-0997
WWW.NWCWD.ORG • EMAIL: WATER@NWCWD.ORG
June 5, 2018
Aurora Organic Farms
28520 WCR 72
Gill, CO 80624
RE: Meter Number 1406 004, Located at 28545 WCR 72
Owner: Little Calf Ranch, LLC
To Whom It May Concern:
North Weld County Water District provides domestic water service to the property located at 28545
WCR 72. The current service provides a 3/4" meter with Water and Plant Investment Allocation of 1 each which
yields 228,000 gallons per year without surcharge rates. Surcharge rates are detailed below.
The District has reviewed the applicant's request to build two restrooms and a kitchen in the existing
shop on the parcel and have no conflict with the request.
Water tap/service is placed on the physical property, defined by a legal description. In case of a
Recorded Exemption, the water tap shall only serve the parcel that the water tap is located on. Service shall
NOT cross the legal description of one parcel to serve the other parcel, unless an easement has been recorded
for the water service and has been approved by the District.
The District guarantees treatment and delivery of water purchased. All water that is delivered with
surcharge is subject to water availability. Water purchased through the District shall be 70% delivery of an Acre -
Foot of water (228,000 gallons), if the allotment for Colorado -Big Thompson (CBT) project water, which is
determined by the Northern Colorado Water Conservancy District, is 50% or greater. North Weld County Water
District will restrict the delivery as necessary when the CBT allotment is less than 50%. A portion of the Raw Water
Fee is utilized by the District to construct storage reservoirs.
The Plant Investment Fee pays for the infrastructure required to deliver 1 AFU (228,000 gallons). If
usage exceeds the number of Plant Investments that were purchased, an additional Plant Investment Surcharge
will be applied to your account. Plant Investments may be purchased to increase the amount of water to be
delivered and avoid the Plant Investment Surcharge. Refer to table below for current Plant Investment
Surcharge schedule.
Water Surcharge
Surcharge will be assessed when an account's year to date usage exceeds their annual allotment. Currently
surcharge is $2.00 per 1,000 gallons. This fee is to recover the District's cost to obtain additional water rights for
delivery. All water that is delivered with surcharge is subject to water availability.
Plant Investment Surcharge
When an account's year to date usage exceeds their Plant Investment Allotment (# of Equivalent Taps x 228,000
gallons), a surcharge will be assessed. The transfer of additional water will not remove this charge. Additional
Plant Investments must be purchased to increase the allotment and reduce the Plant Investment Surcharges.
0 to 456,000 gallons above the Plant Investment Allotment (228,000 gallons)
More than 456,000 gallons above the Plant Investment Allotment
$3.95 per 1,000 gallons
$1.95 per 1,000 gallons
R4cuw
ectfully,
. `ii UO"YL4.
Leann Koons
Office Assistant
ON -SITE WASTEWATER TREATMENT SYSTEM
RECOMMENDATIONS
FOR
28545 COUNTY ROAD 72,
WELD COUNTY, COLORADO
FOR
H & H EXCAVATING, INC.
CDS ENGINEERING CORPORATION
LOVELAND, COLORADO
PROJECT NUMBER
17-8923
SEPTEMBER 14, 2017
•
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September 14, 2017
Project No. 17-8923
Mr. Mike Hojio
H & H EXCAVATION, INC.
P.O. Box 200187
Evans, CO 80620
Dear Mike,
Enclosed is the report you requested of the on -site wastewater treatment system
recommendations for the existing detached commercial building located at 28545 County Road 72,
Weld County, Colorado.
The design criteria and recommendations provided in this report are in compliance with Weld
County regulations for On -site Wastewater Treatment Systems. The system should function
adequately if installed, operated, and maintained in accordance with this criteria.
If you should have any questions concerning the information in the report, please feel free to
contact this office.
Reviewed by:
7/71)//7
Kevin F. Becker, P.E.
Enclosures
Respectfully,
FOR AND ON BEHALF OF
CDS ENGINEERING CORPORATION
Jo D. Eriz, Engineering Technician
TABLE OF CONTENTS
Page
Letter of Transmittal
Table of Contents
Scope
Site Investigation
Site Location and Description
Subsoils and Groundwater Conditions
Soil Treatment Area
Materials
Absorption Field
Backfilling and Site Grading
Conclusions
ATTACHMENTS
Site Drawing and Location of Test Pits
Septic System Design Details
Log of Test Pits
Soil Treatment Area Calculations
General Maintenance Recommendations
Additional Information: Gradation Curves
ii
ii
1
1
2
2
2
3
4
4
Drawing No. 1 A
Drawing No. 1B
Figure No. 1
Figure No. 2
Appendix I
Appendix II
1
SCOPE
This report provides on -site wastewater treatment system recommendations for the proposed
existing detached building located at 28545 County Road 72, Weld County, Colorado. It is our
understanding that this system will service the existing commercial facility. The building will
service ten (10) employees and will be used sporadically for company parties. We were informed
that guests would not exceed 50 people. Therefore, we have designed the system for a maximum
flow of 250 GPD. The wastewater strength is anticipated to be typical for standard appliances and
fixtures.
SITE INVESTIGATION
A field investigation, performed on August 15, 2017, consisted of logging two (2) test to a
depth of eight (8) feet. The Location of the Test Pits is shown on Drawing No. lA. A Log of Test
Pits is shown on Figure No. 1. The descriptions of the soils are based, primarily, on visual and
tactual methods which are subject to interpretation.
Other than the distances to setback objects indicated on the design documents, no other
objects requiring setbacks from the proposed on -site wastewater treatment system (OWTS), as
indicated in Tables 30-7-1 and 30-7-2 of the Weld County Regulations, have been located or
observed during our exploration.
SITE LOCATION AND DESCRIPTION
The site is located east of Galeton, west of County Road 59, and on the north side of
County Road 72, Weld County, Colorado. The site is generally in a plains region with dirt roads
and utilities, and vegetation consists primarily of grass. The site has an approximate 1% slope to
the south. An existing house is located on the same property.
Based on our current information, easements are not noted on the property. However, we
recommend title work be completed prior to construction to ensure the property is clear of
easements. From information provided on the County Property Information Portal Maps, this
property is not located in a floodplain. There do not appear to be any easements or right-of-way
setbacks that would affect the proposed placement of the on -site wastewater treatment system.
2
SUBSOILS AND GROUNDWATER CONDITIONS
Based on the test pits logged within the proposed soil treatment area, the subsurface
conditions at the site consist of clay loam, sandy loam, and loam. Based on the soil texture and
structure within the soil horizon observed in the test pits, the classification used for this design is
Soil Type 2A.
Groundwater levels were recorded at the time of our field exploration. During our field
explorations groundwater was not encountered in the test pits. We do not anticipate the high
groundwater level .to be within four (4) feet of the infiltrative surface.
Based on the conditions described above, a standard absorption system should be suitable for
this site.
SOIL TREATMENT AREA
The infiltrative surface shall be placed between two (2) and four (4) feet below existing
grades.
MATERIALS
The materials used in construction of the on -site wastewater treatment system shall be new,
durable and not subject to corrosion, such as concrete, fiberglass or plastic. All materials shall be
installed per manufacturer specifications. All connections between components shall be water tight
to prevent leaks and infiltration.
Piping
Unperforated plastic pipe used in gravity flow beds shall have a nominal diameter of four (4)
inches, and a wall thickness of 0.120 inches, or greater. SDR 35 or Schedule 40 pipe could
be used. The piping from the building to the septic tank and from the tank to the field shall
have a minimum fall of/s-inch per foot ('/4 inch per foot preferred). Perforated piping used
in the absorption bed or trench shall have a minimum nominal diameter of three (3) inches,
and a wall thickness of 0.070 inches, or greater. ASTM D2729 sewer and drain pipe is
acceptable for this application. Pipe lain in beds or trenches shall be laid level. The terminal
ends of all lines shall be capped or looped with all other lines in the system. Pipe bends shall
3
be limited to 45 degrees or sweeping 90 degree "L"s. Building sewer and effluent lines shall
be buried a minimum of one (1) foot. All pipe bedding and trench compaction shall be in
accordance with the manufacturer guidelines.
Septic Tank
Septic tanks shall meet the provisions set forth in the county on -site wastewater treatment
regulations, and be constructed in accordance with ASTM C1227. Tanks shall be placed a
minimum of five (5) feet from any dwelling or building with a permanent foundation. The
tank shall have a minimum of two (2) compartments. Tank size is based on design flow. See
Drawing No. lB for specific tank size. The tank lid shall be able to support a minimum of
two (2) feet of soil cover. Tank manufacturer shall provide specifications on maximum
cover depth and other design features. These should be provided to the engineer prior to
delivery. Access risers shall be provided for each compartment of the septic tank. Risers
shall have a minimum 24 -inch diameter and extend to, or above, ground level. Riser lids
shall have a secure closing mechanism to prevent unauthorized access. Tanks should be sold
and delivered by the manufacturer or manufacturer's representative.
Distribution Box
Distribution boxes shall be placed on solid, level ground to provide uniform distribution of
the effluent. Flow equalizers, such as speed levelers, shall be installed. The box shall be a
minimum of five (5) feet from the septic tank, and be sufficient size to provide outlets for all
lateral lines, otherwise additional distribution boxes may be required. Outlet lines shall
consist of solid pipe (see piping) for a minimum of five (5) feet. Access to the distribution
box shall be provided by a riser, similar to that described for septic tanks.
ABSORPTION FIELD
The absorption field shall be placed a minimum of twenty (20) feet from occupied or
habitable structures or structures with permanent foundations. The field shall be constructed in
accordance with this report and the drawings provided. The infiltrative surface and distribution
lines, or chambers, must be level.
4
Trenches shall be no wider than three (3) feet; beds shall be no wider than twelve (12) feet.
Evapotranspiration Absorption beds are exempt for this requirement. Beds and trenches shall be
separated by six (6) feet, of undisturbed soil.
Inspection ports, accessible from the ground surface must be installed at the terminal end of
each line. The inspection port tube must extend to the bottom of the infiltrative surface and not be
connected to the end of the distribution pipe. Where chambers are used, the inspection ports shall be
installed per the manufacturer's recommendations, at the end of each line.
See Drawing No. lB for information specific to this project.
BACKFILLING AND SITE GRADING
All major grading shall be accomplished before construction of the sewage disposal system.
Backfilling around septic tanks shall be accomplished before the installation of the piping. Backfill
around the tank shall be in a manner to prevent settlement and avoid undue strain on the tank.
Positive drainage from, and around, the bed must be provided by sloping, mounding, ditching or
berming.
CONCLUSIONS
The system should be constructed by a licensed septic system installer, in accordance with the
County On -Site Wastewater Treatment Regulations. An effluent filter could be installed in or after
the septic tank and may provide a longer life for the system. Minimum dimensions and setback
requirements specified by the state or county health department regulations shall be upheld. It is the
contractor's/owner's responsibility to inform the engineer or health department of anything not
mentioned in this report that may impact the performance of the septic system. This system is to
meet all rules and regulations set forth by the County Health Department. The system is to be
inspected by a representative of the County Health Department and Engineer, prior to backfilling.
All future owners are to be directed to information in Appendix I (General Maintenance
Recommendations) of this report. These tests are only valid for the areas tested. Additional
percolation tests and soil profile information will be required if the septic system is to be constructed
in a different location than covered by this exploration. The findings and recommendations of this
5
report have been obtained in accordance with accepted engineering practices in the field of
Geotechnical Engineering. There is no other warranty, either expressed or implied. The county
health department has final acceptance over these test results and referenced system. All
construction shall be in compliance with the septic system permit.
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EXISTING
RESIDENCE
TP-1
TP- 2
EILEXISTING
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NOTES:
1. Topsoil should be saved for final cover.
2. Design for a maximum of 50 guests, 250 GPD, and LIAR of 0.50 GPD/SF.
3. SEPTIC TANK: 2 compartment tank, minimum 1000 gallon capacity. Locate a minimum of 5' from residence
and/or distribution box. Install risers to ground surface.
4. ABSORPTION AREA: Shall not be excavated in a manner that will compact or smear the infiltrative surface,
i.e. no wheel loads. Infiltrative surface to be level. Bed area and dimensions are provided on this drawing.
5. LIMITING LAYER: None encountered.
6. SUPPLY LINE: Shall be SDR 35 or Schedule 40 PVC laid with a minimum fall of) " per foot 0/4" per foot
preferred). Bedding and backfill shall be compacted to reduce settlement.
7. DISTRIBUTION BOX: If used, shall be laid level for uniform distribution of effluent. Flow equalizers shall be
installed. Install riser to surface.
8. CHAMBERS: 36 Quick 4 Standard Chambers. Chamber information based on published material by
Infiltrator Systems, Inc., and State Regulation 43, Section 43.13 (e)(1)(d). If alternate chambers are to be
used notify engineer prior to construction as bed configuration may change.
9. INSPECTION PORTS: Shall be accessible from the surface. To be installed at the terminal end of each line
or chamber row, and extend to the infiltrative surface. May be installed directly into chamber, see mfr. specs.
10. Outlet lines from the distribution box to the laterals shall be of solid wall pipe for a minimum of 5'.
11. COVER: Cover material to consist of native soils capable of supporting vegetation. Vegetation should be a
drought resistant grass such as a tall fescue. Installer & owner shall coordinate on planting and maintaining
seeds to germination. Tall grass shall be kept short during the winter months.
12. SITE DRAINAGE: drainage shall promote water runoff over the bed and prevent ponding within 10' of bed.
13. SITE USAGE: Vehicle and hoofed animal traffic shall be prohibited over top of bed.
14. See Report and County or State Regulations for additional information.
Mln. ))s3" per foot slope.
All construction to comply
with the Septic System Permit.
Area of infiltrative surface'
shown = 420 sq ft
Establish Vegetative Cover
Native Backfill
STANDARD ABSORPTION BED
Pipe to onto. top
hde of end top,
Inspection Port,
See Note -9.
EXISTING
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MANIFOLD,
INSTALL LEVEL
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Clay loam, brown, tr. roots, mod. hard, damp,
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Clay loom, brown, tr. roots, mod. hard, damp,
Shape: Blocky, Grade: Moderate
//
Shape: Blocky, Grade: Moderate
Soil Type: 3A
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Soil Type: 3A
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Sandy loam, It. brown, sl. calcareous, soft,
Sandy loam, It. brown, sl. calcareous, soft,
1.0% Rock, 83.7% Clay/Silt
1.0% Rock, 83.7% Clay/Silt
-• '•'•
-..Shape;.. SI.. biacky,. Grade- Weak -
Shape: ..SL..block-y,-.Grade:..Weak
Soil Type: 2A
Soil Type: 2A
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Loam, brown, soft, damp,
Loamy sand, brown, loose
Shape: sl. prismatic, Grade: Weak
Shape: Structurless, Grade: Massive
Soil Type: 2A
Soil Type: 1
7'
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8
8
9'
Limiting layer: No Depth: NA Groundwater ' • NA
Limiting layer: No Depth: NA Groundwater . NA
Type:
Type:
Date of Excavation
08/15/17
Dote of investigation
08/15/17
Equipment
Backhoe
Technician
JDE
Soil Type (NRCS)
Vona loamy sand, 3 to 5 percent slopes
All soli and/or rock contacts shown on the test pits are approximate and represent subsurface conditions at time
of excovatlon. Test pit logs and information presented on logs are subject to discussion and limitations of this report.
LOG OF TEST PITS
2DS Engineering
Corporation
165 2nd St. S.W.
Lovel d, Co 80537
CLIENT:
H & H Excavating, Inc.
PROJECT NO.
17-8923
PROJECT LOCATION
28545 County Road 72,
Weld County, Colorado
Fig. No.: 1
Tele: (970) 667-6010
SOIL TREATMENT AREA CALCULATIONS
Number of People:
Minimum Septic Tank Size:
Design Flow
LIAR
50 people at 5 gpd each
1000
250 (Table 30-6-1, WCHD On -site Wastewater Regulations)
0.5 (Table 30-10-1, WCHD On -Site Wastewater Regulations)
Adjustment Factors (Tables 30-10-2 & 3O-10-3, WCHD On -site Wastewater Regulations)
Gravity 1.2 Soil Type: 2A
Chambers 0.7
Type of Chamber used: Infiltrator Quick 4 Standard
Effective Area of Chamber:
Minimum STA (sq. ft.):
12
420
Bed Configuration
Bed Number
Length (ft)
Width (ft)
Number of Rows
Chambers per
Row
Bed Size (ft2)
1
36
12
4
9
432
Total Infiltrative Surface
Area (ft2)
432
Designed Number of
Chambers
36
Calculation Formulas
Minimum Absorption Field Size (ft 2)
Design Flow
LTAR
Adjustment
Factors
250
0.50
x 1.2 x 0.7 = 420
Minimum Number of Chambers
Bed Area
Effective Area
42O
12
= 35 Units
CLIENT:
H & H Excavating, Inc.
CDS
Engineering Corporation
PROJECT NO.
17-8923
LOCATION:
28545 County Road 72, Weld County
165 2nd St SW • Loveland, CO • 80537 • 970-667-8010 • www.cds-eng,net
Fig. No.: 2
\\SERVER\CDS Files\Structural-Geotech\Projects\H & H Excavation\28454 County Road 72\17-8923 OWTS STA
Calcs.xlsx
APPENDIX I
GENERAL MAINTENANCE RECOMMENDATIONS FOR
INDIVIDUAL SEWAGE DISPOSAL SYSTEMS
The following minimum recommendations, if followed, should help increase the lifetime of the
system:
1. Septic tanks should be pumped as often as needed based on usage. Generally when
the scum layer plus the sludge layer equals 25% of the liquid depth in the tanks, it
should be pumped out.
2. Septic tanks and distribution boxes should be checked at least once a year for sludge
accumulation which may clog the leach area if overflow occurs.
3. The leach area should not be used for grazing, sports activities, traffic, or other
activity which may compact the soils.
4. Schedule 80 pipe should be used if lines are to be placed under driveways.
5. Trees should not be planted within 10 feet of the leach area so as to prevent roots
from clogging the system.
6. If trees are to be planted nearby, they should be located so that the leach area is not
shaded.
7. Overuse of strong chemicals, which may kill the bacteria in the system and inhibit
decomposition of the sewage, should be avoided.
8. Positive drainage should be maintained over and around the absorption field area to
prevent pooling of water.
REV 07/23/14
APPENDIX II
ADDITIONAL INFORMATION FOR RECOMMENDED COMPONENTS
CDS Engineering Corporation
GRAIN SIZE ANALYSIS
Client: H & H Excavating, Inc.
Project: 28545 County Road 72, Weld County
Job No: 17-8923
Tech: CS Date: 09/05/17
Boring No,
Location:
TP-1
Depth: 3.5'
Sample No:
Soils Description: Loamy sand, brown, damp
Percent Passing by Weight (%)
100.0
90.0
80.0
70.0
60.0
50.0
40.0
30.0
20.0
10.0
0.0
Sieve Sizes
#200 #100 #60 #40 #30 #20
I I
0 1 1.0
Sieve Opening (mm)
#10 #4 3/8" 1/2" 3/4" 1" 1.5" 2"
00
Silt/Clay
Sand
10.0
Gravel
100.0
Sieve No.
Percent
Retained
Percent Passing
Spec.
Required
1.5"
100.0
3/4"
100.0
3/8"
100.0
4
0.8
99.2
10
1.0
99.0
65-100
40
32.3
67.7
200
83.7
15.3
Sample information
Sample Date:
08/04/16 Type: Bulk
By:
JOE
Moisture Content:
4.5
Atterberg
LL:
PL:
PI:
Gradation (%)
Rock: 1.0
Sand: 82.7
Silt/Clay:
16.3
Classification
USCS: 0
AASHTO:
CDS Engineering Corporation • 165 2nd St SW • Loveland, Colorado 80537 • (970) 667-8010 • (800) 933-8011 • Fax: (970) 667-8024
www.cds-enq.net
9/13/2017
17-8923 OWTS Grad.xisx
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