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DESIGN REPORT P-Ytito
ON-SITE WASTEWATER TREATMENT SYSTEM (OWTS) 11-w
TBD CR 237
TRACT 23
SILT, COLORADO
GARFIELD COUNTY
GARFIELD COUNTY
COMMUNITY DEVELOPMENT September 20, 2019
Prepared By: Kenneth J. Brotsky, P.E.
558 Rio Oso Lane
Grand Junction, CO 81507
(970)216 8861
I. INTRODUCTION:
This Report has been prepared at the request of Clayton Homes,
representative for the above referenced property. This Report
addresses the design of an On -Site Wastewater Treatment System to
serve a proposed residence. Public sewer service is not
available.
The procedures used in this report follow the "Garfield County
On -Site Wastewater Treatment System Regulations".
II. SOILS AND PERCOLATION TEST:
The site is a fairly flat, high desert area, with ground slopes
generally about 2% to the southwest The site is heavily
vegetated with grass and salt brush.
A test hole was dug in the general area of the proposed OWTS.
The upper 8" of soil is loamy. clay topsoil. From 8 to 22" there
is grey, silty, clay. Below this layer to 96" is a gravelly,
silty, clay. This layer is a sedimentary matrix of minus 2"
gravel and silty clay.
Percolation rate in the silty clay layer is 34 minutes per inch
and in the gravelly clay it is 30 minutes per inch. A Long Term
Acceptance Rate of 0.6 gallons per square feet per day will be
used for design.
A 4 row bed of infiltrators will be used. The bottom of the
absorption bed will be set at 26" below the existing grade at the
southwest corner of the bed.
III. SYSTEM DESIGN:
A. Estimated Sewage Flow: The proposed house will be 3
bedroom.
3 x 150 = 450 gallons per day
B. Septic Tank
Use a 1,000 gallon tank.
C. Absorption Bed:
The absorption bed size is calculated as
follows:
A = 450/.6
= 750 sq. ft.
Adjustment Factors:
Table 5.2 Method of Application is gravity
Factor 1.2
Table 5.3 Type of Distribution is Chambers
Factor 0.70
Bed Size required is 750 x 1.2 x 0.70 = 630 Sq. Ft.
Total Number of chambers required is 630/12 = 52,5 units
Use bed configuration, with 4 rows and 14 chambers per row
for a total of 56 chambers.
,2iA+�
KENNETH J. BROTSKY,'4j
No. 18843
9. zo-11
PERCOLATION TEST DATA TABLE
#094oem off
ADDRESS: 780- e/2 ZJ�' DATE 09'/9
HOLE
DEPTH
23/4 33,/# 11%L
/V,/
TIME
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DROP
RATE
AVE.
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22-,6" CamrauIS fp, t":,4rr
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22-,6" CamrauIS fp, t":,4rr
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RATE SLOWER THAN 60 MPI rt/
RATE FASTER THAN 5 MPI iV
SLOPE GREATER THAN 30% W
HSWT DEEPER THAN 4 FT. Y
HOLE LOCATION DIAGRAM
BEDROCK LESS THAN 4 FT. A/
FLOODPLAIN /v
ON-SITE WATER y `S
REPAIR AREA
GWT --- HSWT -�
COMMENTS:
TESTED BY:�+t
SIGNATURE
Dr
pRo
f USE END PLATE ON
j EACH ROW
VENT/INSPECTION PORTS
/ SEE DETAIL. 4 RQD.
QUICK 4 INFILTRATORS
4 ROWS, 14 EACH ROW
= 56 TOTAL
SEE MANIFOLD DETAIL
SET BOTTOM OF INFILTRATORS
26" BELOW EXISTING GRADE
AT SOUTHWEST CORNER OF THE BED
PLASTIC OR HDPR LID
FLAT OR DOMED • •
FASTEN TO RISER
24^ DIAMETER
HDPE RISER
FINISH GRADE
TANK COVER
FASTENTO TANK
- TANK WALL
TANK RISER DETAIL
4 ROWS INF+AC.'1RATORS
4",x 4" z 4" TSE
4" PVC F(OM TANK
4^:911411EHD•
USE SIDE INLETS •
•
•
MANIFOLD DETAIL • • .
1000 GALLON
SEPTIC TANK
SEE NOTES.
NORTH
SCALE: 1" = 20'
TOP of nousl;
FOUNDATION 100.0
CLEANOUT
PROPOSED HOUSE
3 BEDROOM
-4"PVC CLEANOUT
(-RISERS' r VENTI1NSPECTION TOSE 1
mUMWmuimpe
imu
68IAI,
97.s
SE'TiC TANK,
FLOW -LINE PROFILE
SCHEMATIC
NOT TO SCA LF.
!7'!IHftOThft 61
4)DVER .
QUICK 4 INFILTRATORS
4 ROWS 14 EACH ROW
= 56 TOTAL
SET BOTTOM OF INFILTRATORS
26" BELOW EXISTING GRADE
AT SOUTI1WESTCORNER
OF THE BED
•2000MERTeE71F1Ila
Jr.wriaccins memo
WARM OViat INFIUMATaRS
�G-
SET BO'T'TOM OF INFILTRATORS
26" BELOW EXISTING GRADE
AT SOUTHWEST CORNER
OF THE BED
NOTES
1. Contact Engineer for inspections at the following times: (Allow at least 24 hours advance
notice). (Engineer will coordinate inspection time with Garfield County)
1) When installation of the infiltrators, piping, and septic tank is complete but not
covered, and ready for final inspection.
Engineer is Kenneth J. Brotsky (970) 216-8861
2. The pipe from the house plumbing to the septic tank and from the tank to the absorption bed
shall be 4 inch diameter, SDR 35, PVC sewer pipe. The pipe shall be laid at a minimum slope
of 1/4 inch per foot.
3. INFILTRATOR units to be installed per manufacturers recommendations. Units to be "Quick 4".
Geo -textile landscaping fabric shall be draped over the Infiltrators as shown.
4. The
septic tank shall be a 1,000 gallon, 2 -compartment tank approved by Garfield County.
5. All construction shall be in accordance with Garfield County On -Site Wastewater Treatment
System Regulations", most current edition.
6. Any changes to the layout on these drawings must have the approval of the Engineer prior to
construction. Any unauthorized changes may have to be corrected. Any costs for redrawing of
plans required because of unauthorized changes may be back charged to the installer.
7. Installer responsible for calling for "Locates".
8. An OWTS Permit must be obtained from Garfield County prior to starting installation of
system.
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SITE PLAN, DETAILS, & NOTES
ON-SITE WASTEWATER TREATMENT
SYSTEM (OWTS)
TBD - CR 237
TRACT 23
SILT, COLORADO
GARFIELD , COUNTY
Sept. 19, 2019 DWG 1 OF 1