HomeMy WebLinkAboutOWTS Design Report 09.23.2019DESIGN REPORT
ON-SITE WASTEWATER TREATMENT SYSTEM (OWTS)
TBD CR 237
TRACT 10
SILT, COLORADO
GARFIELD COUNTY
September 23, 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 6" of soil is loamy, clay topsoil. From 6 to 18" there
is grey, silty, clay. Below this layer to 96" is a gravelly,
silty, gravelly, clay. This layer is a sedimentary matrix of
minus 2" gravel and silty clay, with some rocks up to about 24"
in size.
Percolation rate is 23 minutes per inch. A Long Term Acceptance
Rate of 0.7 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 4
bedroom.
4 x 150 = 600 gallons per day
B. Septic Tank
Use a 1,250 gallon tank.
C. Absorption Bed:
The absorption bed size is calculated as
follows:
A = 600/.7
858 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 858 x 1.2 x 0.70 = 720 Sq. Ft.
Total Number of chambers required is 720/12 = 60.1 units
Use bed configuration, with 4 rows and 15 chambers per row
for a total of 60 chambers.
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KENNETH J. BROTSKY,.PE'0a: ;'"'j
No. 18843
PERCOLATION TEST DATA TABLE
ADDRESS:75D- 57-772Aer DATE 9 -t
HOLE
DEPTH
/z: 56
TIME
Za
DROP
RATE
AVE.
£L
50 -6 sni
5 yq9 .57z
t %z
z 4/
D
\-.- `-
'' LArly CLA7 Tee) /25 0/L
fina
"18" 3,e.4 eL# f
1L G moi -c'
r 41P
- 9� S '�' RAva c r��
C'G Ay �
M jtf U
\ 6
ei
0
Z
G573"
z 3%z y3/�
zsAA
ze
D
E
P
T
H
.,
,z -
Zy u -
3''-"
ydn-
COo°-
2Z' -
D
\-.- `-
'' LArly CLA7 Tee) /25 0/L
fina
"18" 3,e.4 eL# f
1L G moi -c'
r 41P
- 9� S '�' RAva c r��
C'G Ay �
M jtf U
\ 6
ei
0
RATE SLOWER THAN 60 MPI Al
RATE FASTER THAN 5 MPI
SLOPE GREATER THAN 30% /u
HSWT DEEPER THAN 4 FT.
BEDROCK LESS THAN 4 FT. 4/
FLOODPLAIN /1 Z
ON-SITE WATER J '�
REPAIR AREA
5
GWT ---r HSWT
HOLE LOCATION DIAGRAM
COMMENTS:
TESTED BYrd 41,4-
SIGNATURE
�/z apo CL _70
MOO sc-
USE END PLATE ON
EACH ROW
VENT/INSPECTION PORTS
SEE DETAIL. 4 RQD.
QUICK 4 INFILTRATORS
—4 ROW S, 15 EACH ROW
= 60 TOTAL
r>~
_ I ,
Ir-=- r r
REPLACEMENT AREA y
PLASTIC OR HDPR LID
• FLAT OR DOMED •
FASTEN TO RISER T
24" DIAMETER
HDPE RISER
I
LD DETAIL
FINISH GRADE
mi -j FASrEN TO TANK
•TANK WALL
TANK COVER
TANK RISER DETAIL
SegeeW DA/
e 7R/cc N
3/, "Nola5
PIPE
All 72AYo/e
BaTTDiLY DF
/ /P/LT?97.02
D/2/LL 2 - lz11 /-rbc/Fs
3'x[//2 FCO //'/ B 'Tram
VE/v/i /.5PECrrew %o€r
1250 GALLON
SEPTIC TANK
SEE NOTES.
)
CLEANOUT
0 o --1-
\--SEE MANIFOLD DETAIL
PROPOSED HOUSE
4 BEDROOM
SET BOTTOM OF INFILTRATORS
26" BELOW EXISTING GRADE
AT SOUTHWEST CORNER OF THE BED
NORTH
SCALE: 1" =20'
TorOrllausk:
FOUNDATION 100.0
4ACILFII.I. win;
?.TPAsMIAAEAL, L
4" PVC CLEANOUT !
RISERS'
q%In
SEPTIC TANK
VENT,INSPECTION TUBE I
�S QUICK 4 INFILTRATORS
4 ROWS ,15 EACH ROW
FLOW -LINE PROFILE
SCHEMATIC
NOT TO SCALE
COYER -
= 60 TOTAL
SET BOTTOM OF INFILTRATORS
26" BELOW EXISTING GRADE
AT SOUTHWEST CORNER
OF THE BED
• ournormenuI>11C
• [RAPSUOVER DIFu.TRRTORS
•
1 . ----�
_l' SET BOTTOM OF INFILTRATORS
' 32" BELOW EXISTING GRADE.
AT SOUTHWEST CORNER
• OF BED
1
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, SUR 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 1,25
0 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 priorto starting installation of
system.
SITE PLAN, DETAILS, & NOTES
ON-SITE WASTEWATER TREATMENT
SYSTEM (OWTS)
TBD - CR 237
TRACT 10
SILT, COLORADO
GARFIELD , COUNTY
Cant
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