HomeMy WebLinkAboutOWTS Installation Observations 05.11.19
May 11, 2019 Project No. C1348
Robbie Levin
robbie@leafpeople.com
Onsite Wastewater Treatment System (OWTS) Installation Observations
Lot 15 Ranch at Coulter Creek
778 Cattle Creek Ridge Road
Garfield County, Colorado
Permit Number SEPT-18-5176
Robbie,
ALL SERVICE septic, LLC observed the installation of the onsite wastewater treatment system (OWTS)
on August 30, 2018 and May 10, 2019 for the subject property. Ryan Ivy installed the system.
The system installation included a 1500-gallon, two-compartment Valley Precast concrete septic tank
with an Orenco® ProPak pumping system and PF3005 pump in the second compartment of the septic
tank. The effluent filter in the second compartment must be cleaned annually, or as needed. The
floats were set to dose approximately 80 gallons each pump cycle, allowing for approximately 5 gallons
of drain back into the septic tank after each pump cycle. This will result in a dose to the field of
approximately 75 gallons each pump cycle.
Risers were installed on the septic tank to bring access to grade. Handle extensions on both the effluent
filter and float tree must be installed if the riser height exceeds 1-foot. The control panel was located
within line of sight of the septic tank. Valley Precast out of Buena Vista performed start up on the
pumping system.
A 1.5-inch diameter Schedule 40 pump was installed from the pump to an Orenco® automatic distributing
valve (ADV), model 6605. The ADV was placed a high point in the system in an insulated riser with access
from grade. Screened rock was placed below the ADV to support the ADV and to assure the clear pipes
exiting the ADV remain visible for future inspection and maintenance.
Effluent is pressure dosed through 1.5-inch diameter pipes to five trenches, each with 17 ‘Quick 4’
Standard Plus Infiltrator® chambers, for a total of 85 chambers and 1020 square feet of infiltrative area.
There was at least 6-feet of undisturbed soil between each trench. Effluent is pressure dosed to 1.5-inch
diameter laterals, which were hung with zip ties from the underside of the chambers. Laterals have 5/32-
inch diameter orifices facing up, with the exception of the first and last holes facing down for drainage.
The orifices were drilled 3-feet on center. Each lateral ends in a 90 degree ell facing up with a ball valve
for flushing. Valves were placed in a valve box, accessible from grade, for access. Inspection ports were
placed at the beginning and end of each trench. Ports may be cut to grade and covered with a valve box
for access.
The OWTS was generally installed according to specifications. This observation is not a guarantee of
workmanship and/or parts and materials. ALL SERVICE septic, LLC should be notified if changes are
made to the OWTS in the future. Any additional OWTS construction must be according to the county
regulations.
LIMITS:
Observations are limited to components that are visible at the time of the inspection . The installer must
have documented and demonstrated knowledge of the requirements and regulations of the county in
which they are working. The quality of the installation is dependent of the expertise of the installer, soil
type, and weather conditions.
Please call with questions.
Sincerely,
ALL SERVICE septic, LLC Reviewed By:
Carla Ostberg, MPH, REHS Richard H. Petz, P
Photos August 30, 2108
End of trench view of septic tank from soil treatment area (STA)
5/12/19
Septic tank prior to backfill
View of trench
Trench flushing valve and inspection port
Flushing valve
May 10, 2019
View of STA Automatic distributing valve
ADV (needs more gravel) view of septic tank lids
Control panel counter (black) – track counts at 75 gallons per pump cycle
Clean out (needs cap)
Pump Selection for a Pressurized System - Single Family Residence Project
Levin
Parameters
Discharge Assembly Size
Transport Length Before Valve
Transport Pipe Class
Transport Line Size
Distributing Valve Model
Transport Length After Valve
Transport Pipe Class
Transport Pipe Size
Max Elevation Lift
Manifold Length
Manifold Pipe Class
Manifold Pipe Size
Number of Laterals per Cell
Lateral Length
Lateral Pipe Class
Lateral Pipe Size
Orifice Size
Orifice Spacing
Residual Head
Flow Meter
'Add-on' Friction Losses
1.25
42
40
1.50
6605
60
40
1.50
5
0
40
1.50
5
70
40
1.50
5/32
3
5
None
0
inches
feet
inches
feet
inches
feet
feet
inches
feet
inches
inches
feet
feet
inches
feet
Calculations
Minimum Flow Rate per Orifice
Number of Orifices per Zone
Total Flow Rate per Zone
Number of Laterals per Zone
% Flow Differential 1st/Last Orifice
Transport Velocity Before Valve
Transport Velocity After Valve
0.68
24
16.4
1
3.9
2.6
2.6
gpm
gpm
%
fps
fps
Frictional Head Losses
Loss through Discharge
Loss in Transport Before Valve
Loss through Valve
Loss in Transport after Valve
Loss in Manifold
Loss in Laterals
Loss through Flowmeter
'Add-on' Friction Losses
1.9
0.7
5.8
1.0
0.0
0.5
0.0
0.0
feet
feet
feet
feet
feet
feet
feet
feet
Pipe Volumes
Vol of Transport Line Before Valve
Vol of Transport Line After Valve
Vol of Manifold
Vol of Laterals per Zone
Total Vol Before Valve
Total Vol After Valve
4.4
6.3
0.0
7.4
4.4
13.7
gals
gals
gals
gals
gals
gals
Minimum Pump Requirements
Design Flow Rate
Total Dynamic Head
16.4
19.8
gpm
feet
0 5 10 15 20 25 30 35 40
0
50
100
150
200
250
300
Net Discharge (gpm)
PumpData
PF3005 High Head Effluent Pump
30 GPM, 1/2HP
115/230V 1Ø 60Hz, 200V 3Ø 60Hz
PF3007 High Head Effluent Pump
30 GPM, 3/4HP
230V 1Ø 60Hz, 200/460V 3Ø 60Hz
PF3010 High Head Effluent Pump
30 GPM, 1HP
230V 1Ø 60Hz, 200/460V 3Ø 60Hz
PF3015 High Head Effluent Pump
30 GPM, 1-1/2HP
230V 1Ø 60Hz, 200/230/460V 3Ø 60Hz
Legend
System Curve:
Pump Curve:
Pump Optimal Range:
Operating Point:
Design Point:
832‐R‐13‐002