HomeMy WebLinkAboutOWTS Installation Observations 01.17.2020
January 17, 2020 Project No. C1462
Kristin Byman
krit07@hotmail.com
Onsite Wastewater Treatment System (OWTS) Installation Observations
833 CR 237
Garfield County, Colorado
Permit Number SEPT-05-19-5744
Kristin,
ALL SERVICE septic, LLC observed the installation of the onsite wastewater treatment system (OWTS)
on December 5, 2019 for the subject property. E&L Trucking installed the system.
The OWTS design is based on 6-bedrooms in the main house and 2-bedrooms in the
Shop/Additional Dwelling Unit (ADU). An average daily wastewater flow of 975 GPD was used.
A 4-inch diameter SDR-35 sewer line was installed exiting the ADU with a double-sweep clean out. A
1000-gallon, two-compartment Valley Precast concrete septic tank was installed with an effluent filter on
the outlet tee.
Effluent gravity flows to the sewer line serving the main house, before it enters the main house septic
tank. This section of sewer line crosses the water line. The sewer line was encased at least 10-feet on
each side of the water line crossing. The sewer line from the ADU connects with a “wye” fitting to the
sewer line that serves the main residence.
A 4-inch diameter SDR-35 sewer line was installed exiting the main house with a double-sweep clean
out. A 2000-gallon, two-compartment Valley Precast concrete septic tank with an Orenco® ProPak and
duplexing PF3005 pumps in the second compartment of the septic tank was installed. The floats were
set to dose approximately 80 gallons each pump cycle, allowing for approximately 4 gallons of drain back
into the pump chamber after each pump cycle. Valley Precast personnel performed start up of the
pumping system.
At the time of our final inspection, the pump chamber did not have water to test to the pumps and
cycle the ADVs. An additional visit will be scheduled once water is available in the pump tank.
Two 1.5-inch diameter Schedule 40 pump lines were installed from the pumps to two Orenco® automatic
distributing valves (ADV), model 6605. Effluent is pressure dosed through 1.5-inch diameter pipes to ten
trenches (two sets of five trenches), each with 16 ‘Quick 4’ Low Profile Infiltrator® chambers, for a total of
160 chambers and 1920 square feet of infiltrative area. There was least 4-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 placed 3-feet on center.
Each lateral ends in a 90 degree ell facing up with a ball valve for flushing. Valves may be placed in a
valve box, accessible from grade, for access. Inspection ports must be 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,
Photos taken by contractor during installation
Tank serving shop
1/17/2020
1000 gallon tank serving ADU
Septic tank serving main house
Chamber trench installation laterals hung under chambers
Photos from 12/5/19 inspection
View of pump chamber
ADV piping to trenches
ADVs (Note valves are CLOSED in this photo. Valves must be OPEN when in use).
Inlet tee pump chamber
Pump lines exiting riser
Piping to trenches cast iron lids on ADU tank
832‐R‐13‐002