HomeMy WebLinkAboutOWTS Design Plan 11.01.2020` i
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BURIED
CULVERT
DRIP UNE
DRIP UNE
EXISTING DRIVE
CO- 325
ABANDON, REMOVE GATE
AND REPLACE WITH FENCE
CDOT ACCESS PERMIT DETAILS, REQUREMENTS, AND DESIGN CRITERIA
Permit No. 320111
Location; HWY 325A, MP 3.172 Right
Road Classification; R-B (Rural Highway)
These Drawings will be marked preliminary until a Notice to Proceed is Issued by CBOT Owner or Contractor may NOT
proceed with any construction without receiving an approved Notice to Proceed (NTP) from CDO7 Failure of receiving
a Notice to Proceed prior to any construction will be a violation of the State Highway Access Code (2 CCR 601-i,"the
Code') § 2.4.
SSD (Stopping Sight Distance);
Field measured by Colorado River Engineering=
Southbound; 426-feet
Northbound:+700-feet
SSD Code Requirements;
Tables 4-1 & 4-2. Table 4-2 is more controlling and is for the vehicle entering the highway. The posted
speed limit is 40 mph, the use is residential, controlling 55D is 400-feet. The code has an adjustment for
grade, using survey points for the centerline for the northerly (southbound lane) sight distance grade is
approximately i% and therefore no adjustment factor is req'd (Table4-4). The approach from the south
(northbound lane) slope is 3% on average downgrade use 1.2 Factor, SSD =1.2 x 400= 480 SSD reqmt, 600+
available, ok.
The traffic control plan must be:
A. Comply with CDOT Standard Plans Manual for Maintenance and Signing; and
B. Be consistent with the MUTCD, identifying the type, number and spacing for all devices; and
C. Be prepared by individual with American Traffic Safety Services Association (ATSSA) or Colorado
Contractors Association certification - or sealed (stamped) by a Colorado registered professional engineer;
and
D. Be acceptable to CDOT prior to any construction within the right-of-way; and
E. Be presented in a manner that provides a method of handling traffic (MHT) for each different phase of
construction; and
F. Describe the MHT according to the proposed construction phasing and include dimensioned diagrams of
work zone elements, with the final traffic control plan submitted a minimum of three working days in
advance of construction. (Such plans may be revised as necessary with CDOT concurrence.)
BASE SURVEY DATA FROM TRAVIS 1 KAISER PLS.
Description
These drawings have been prepared for the client identified on the design sheet titleblock.
Unless these drawings bear a signed engineers seal, they may be used only at owners sole risk.
Drawing Revisions
Approved
Engineer's Seal
MAX 100'
[EXPOSED PIPE I
BURIED
CULVERT
PROPOSED WELL
LOCATION
PROPOSED PROPANE
TANK (BURIED)
Original Drawing Preparation
Checked
Approved
Client Approved
sealed
PROPOSED
HOME SiTE
PROPOSED
ELECTRIC
10/2020
II/1/2020
- RIFLE CREEK CANYON DITCH
PROPOSED
SEPTIC TANK
FEMAZONE B
PROPOSED DRIVE
WEST LATERAL RCCD
60' RIGHT OF WAY, SEE
DRAKE CONSULTING SURVEY
CoLo1ao
RIVER
ENGINEERING
IAC ORPORATED
SHEET TITLE:
PO Box 1301
Rifle, CO 81650
Tel970-625-4933
EFFLUENT LINE
PROPOSED WASTEWATER
TREATMENT AREA
(SEE SHEET 6)
FEMA ZONE A3
NEWT TIC
C/o Mike Johnson
970-366-6100
PROJECT: MWJ LLC SITE PLAN
CRE FILE: M:\Land Projects R2'\.1213-Johnson\dwg\CRE SITE PLAN Design dwr
MIN SETBACK 10'
SITE PLAN
11/1/2020
SHEET NO. OF 7
Revision A
FEMA ZONE A3
SEE SHEET 7 FOR DETAILS AND SPECIFICATIONS.
Description
These drawings have been prepared for the client identified on the design sheet titleblock.
Unless these drawings bear a signed engineers seal, they may be used only at owners sole risk.
FEMA ZONE B
INFILTRATOR ROW, 6 EACH —
QUICK 4 INFILTRATORS
Drawing Revisions
DRAINAGE SWALE 3'
WIDE, 1 FOOT DEEP,
MIN SLOPE 1%
MIN SETBACK 10'
Approved
EFFLUENT LINE
Engineer's Seal
PROPOSED
WASTEWATER
TREATMENT AREA
Original Drawing Preparation
Checked
Approved
Client Approved
sealed
10/2020
II/1/2020
DISTRIBUTION BOX
SETBACK 50'
COLORADO
RIVER
ENGINEERING
INCORPORATED
RIFLE CREEK CANYON DITCH
APPROXIMATE PROPERTY
BOUNDARY
PO Box 1301
Rifle, CO 81650
Tel 970-625-4933
MWJ LLC
C/o Michael Johnson
970-366-6100
PROJECT: MWJ LLC SITE PLAN
CRE FILE: M:\Land Pr jects R2\1213-Johnson\dwg\CRE SITE PLAN Design dwg
11/1/2020
SHEET TITLE:
WASTEWATER -TREATMENT
PLAN
SHEET NO. OF 7
Revision A
24" O Manhole Frame & Cover.
Concrete and Cast Iron Riser Shown.
Alternate HDPE or Fiberglass may be
used.
Inlet and Outlet Pipes to be Sealed
with Waterproof Material (typ)
— 24"
24"
Pipe To Septic Tank
4" SDR 35 Sewer, Typ.
(Schedule 40 Under Roads)
(min. Slope = 2%)
Septic Tank
(Traffic Rated if Installed
in Roadway)
Actual Invert Elevation of pipe
leaving building unknown pending
mechanical design by others.
b
Inlet Inverts shall be
at least 3" Higher than
the Outlet Invert
1250 Gallon Min.
Septic Tank
(Divided)
Concrete Septic Tank Detail
SOLE Vat . Snob
Double Clean -Outs w/Removable Caps on
line from Building to Septic Tank.
Bi-Directional Cleanouts may be substituted.
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Cleanout Detail
SOIE it. Stab
Treatment Area Infiltrator Plan
SOME Ng fah
Pipe To Septic Tank
4" SDR 35 Sewer, Typ.
(Schedule 40 Under Roads)
(Min. Slope = 2%)
cr m
Maximum Length from building
to Septic Tank 100'
Example piping layout shown.
May be altered to
accommodate distribution box
hole layout. Min. Slope 2% to
Trenches.
Install Polylok Equalizer,
Tuf-Tite Leveler, or Equal at
Inlet of Each Feeder Pipe.
L
1
itlkS
Effluent Screen w/ Handle
Extended to within 24" of
surface.
Concrete Septic Tank Shown.
Alternate 2 Chamber HDPE Tank
and Risers may be substituted.
Concrete Distribution Box
Shown. Alternate HDPE Box
may be substituted.
36" HDPE or Fiberglass Riser w/
Lid for access to Flow Equalization
Devices.
4" Pipe to Distribution Box. Approx.
400'. Min. Slope = 2% Install Cleanout at
each 100' or at each pipe angle
transition. Install Tracer Wire with Pipe.
36"0 Access w/Lid
4' SDR 35 Sewer Pipe to
Trenches —\ ,
1
m
1
Distribution Box w/ Baffle. Bed on
6" Cl. 6 Base Course Compact Base
to 95% Modified Proctor.
Concrete Distribution Box
Shown. Alternate HDPE Box
may be substituted.
11 Hole Distribution Box
Shown. Alternate 7 Hole Box
may be substituted.
36" HDPE or Fiberglass Riser w/ Lid
Distribution Box Detail
Original Grade
Backfill with excavated
materials. Max 1' lifts.
Compacted to 95% modified
proctor density.
4" Pipe from Septic to
Distribution Box
r-2.0'—1
Wastewater Pipe Trench Detail
iYEYbSob
SYSTEM DESIGN:
An On -site Wastewater Treatment System (OWTS) is intended to serve the proposed Johnson Residence at Rifle
Gap.
For wastewater design purposes, the residence will contain 3 bedrooms and accommodate up to 6 residents.
Therefore, the expected Daily Wastewater Design Capacity is 450 gallons.
The Minimum required septic tank size is 1,000 gallons although a 1,250 gallon tank is recommended.
The septic tank size requirements will be met by one 1,250-gallon concrete or HDPE tank. The tank will collect the
influent from the residence. The septic tank will discharge by gravity to a distribution box. Effluent from the
distribution box will flow by gravity to the soil treatment area located to the south of the residence.
For design purposes, the soil percolation rate is based on the percolation tests cond
ucted at the Johnson Property.
The measured average soil percolation rate was determined to be 28.3 min/inch. Conservatively, a design soil
percolation rate for soils with percolation rates between 41 to 60 min/inch will be used.
Design Percolation Rate: 41-60 min/inch
Design Long Term Acceptance Rate (LTAR): 0.35 gal/sq.ft./day
The required Soil Treatment Area (STA) for a gravel type leach area is calculated using the following formula:
STA = Design Flow / LTAR
Therefore, STA = 450-gpd / 0.35 gal/sq.ft./day
STA = 1,286-sq.ft.
OWTS regulations allow a maximum reduction of 30% of the required soil treatment area for a gavelless type
design in a Trench configuration. The proposed system will be a Chambered system in a Trench configuration.
Therefore, the required Soil Treatment Area = 1,286 sq.ft. x 0.7 = 900 sq.ft.
Required number of standard Quick 4+ Infiltrator Units = 900 sq.ft. / 1133 sq.ftjunit = 80 units
Conservatively, the system system size will be increased by 20% to 96 Standard Quick 4+ Infiltrator Units.
There shall be 6 Trenches with each being 16 units long for uniformity for a total of 96 units.
Minimum Horizontal Setbacks:
Min. Setback from Welts:
Min. Setback from Creek and Ditch:
Min. Setback from Property Lines:
100 ft
50ft
10ft
The above designed OWTS shall be installed to satisfy all minimum setbacks and design standards as described by
Garfield County and Colorado State regulations and will be installed according to all manufacturers specifications
and recommendations.
4" PVC Inspection Ports (typ) at end of each row.
Protect with Irrigation Valve Box. 4" Notch to be
cut in Infiltrator and secured with screws.
Use a cap or threaded plug to seal each port.
A
Actual elevations to be determined based on
existing conditions encountered in the field.
Finished Grade
\\...____ Backfill with Excavated Soils
(See Infiltrator installation instructions)
Quick4+ Infiltrator Units, Trench
configuration
f)
g)
h)
6)
a)
b)
c)
d)
e)
f)
NOTES:
1) General
a) Engineered system requires Engineer's approval on all constructed items.
b) Contractor shall notify engineer of construction progress so that engineer may schedule inspections
accordingly.
c) No back fill will occur on constructed items prior to engineer's inspection and approval.
d) Engineer shall be notified when soil treatment area is under excavation
e) Contractor shall reclaim all disturbed areas to pre existing conditions.
f) For areas where vegetation is disturbed, contractor shall reseed with NRCS approved seed mixture or as
approved by owner.
g) Grading shall be accomplished such that roof drains, foundation drains, area drains or cistern overflows
shall not enter the septic tank or any part of the wastewater treatment system.
h) Contractor responsible for locating water lines, wastewater lines, irrigation lines and other utilities that
may or may not be shown.
3) Soil Treatment Area
a) Orientation can be adjusted to match ground contours as long as setbacks shown on plan view are met.
b) Alternative configurations of number of rows and length can be constructed as long as setbacks are
maintained, total area is not reduced, and proposed layout is provided to engineer for prior approval.
c) The final cover over the trenches shall be graded to deflect run-off water away from the soil treatment
area.
4) Distribution Box
a) Contractor may use a single distribution box as shown on plan or multiple boxes may be used with sketch
plan to be provided to engineer for prior approval.
b) Location of distribution box(es) and pipeline route to each trench may be field adjusted.
c) Distribution box(es) shall be constructed with the inlet invert at least 1 inch above the level of the outlet
inverts.
5) Pipelines
a) The contractor may use a 6" PVC alternate, minimum slope would be 1%.
b) The pipeline alignment may be field adjusted to avoid existing infrastructure and utilities as long as
minimum slope and minimum bury depths are maintained.
c) The sewer line shall have a minimum offset distance of 10-feet from any water line.
d) At water line crossings, the sewer shall either be 18" below the water line or encased 10-feet each side in
concrete or larger diameter pipe. Water line/sewer line separation encroachments must comply with
CDPHE encasement requirements.
e) Cleanouts per plumbing code. Double cleanout between buildings and septic tank may be removed if
plumbing code allows use of interior building cleanout and access bends in the building sewer shall be
limited to 45" ells or long sweep quarter bends.
All plumbing fixtures, sewers, vents, and appurtenances shall comply with State and local plumbing codes.
All pipe trenches shall be recompacted to 95% std density or as field approved by engineer.
Sch. 40 PVC is required whenever the building sewer is located under a driveway. Alternatively, pipe to be
bedded with material to be approved by engineer.
Septic Tank
The distance from the outlet invert to the tank cover shall be at least 12 inches.
Liquid depth shall be a min. of 30 inches and the max. depth shall not exceed the tank length or 60 inches,
whichever is less.
The volume of the first compartment shall hold no less than 1/2 of the required effective capacity.
The transfer of liquid from the first compartment to the second shall be made at a liquid depth of at least
14 inches below the outlet invert but not in the sludge zone.
No enclosed structure shall be constructed over the septic tank.
Tanks shall be inspected annual and pumped every 5-years, or as needed.
6 Trenches Each with 16 Quick 4+ Units. Minimum 6'
Spacing Between Rows.
Stub 4" SDR 35 Sewer Pipe
into Infiltrator Unit and secure with
screws. Install splash plate below
inlet.
Scarify Excavated Leaching Surface (Keep Heavy
Equipment Out of Excavated Area). Entire Leaching
Bed/Trench Surface to be Level Within 0.1 feet.
Treatment Area Infiltrator Profile
bile Not bSeib
These drawings have been prepared for the client identified on the design sheet titieblock.
Unless these drawings bear a signed engineers seal, they may be used only at owners sole risk.
Engineer's Seal
11/1/2020
Drawing Revisions
Original Drawing Preparation
No
t0
A
Description
By
Date
Approved
Date
Drawn
By
JDL
Date
10/2020
Checked
Approved
Client Approved
CM
sealed
11//2020
CoaAoO
ENGINEERING
1JCORPORATILD
PO Box 1301
Rifle, CO 81650
Tel 970-625-4933
CLIENP
MWJ LLC
C/o Michael Johnson
970-366-6100
PROJECT: MWJ LLC SITE PLAN
CRE FILE: M:\Inf Projects R2U213-JohnsonWwggCRE SITE PLAN Design.dwg
SHEET TITLE:
WASTEWATER
DETAILS
SHEET NO.
OF 7
Revision A