HomeMy WebLinkAboutEngineer's Installation Observation Report 11.06.2018H-PKUMAR
Geotechnical Engineering 1 Engineering Geology
Materials Testing J Environmental
5020 County Road 154
Glenwood Springs, Colorado 81601
Phone: (970) 945-7988
Fax: (970) 945-8454
Email: hpkglenwood@kumarusa.com
Office Locations: Parker, Glenwood Springs, and Silverthorne, Colorado
November 6, 2018
Ridge Runner Construction
Attn: Brent Lough
1655 County Road 109
Glenwood Springs, Colorado 81601
blridgerunner@gmail.com
Project No. 18-7-187.02
Permit No. SEPT -05-18-5240
Subject: As -Built Evaluation of New Onsite Wastewater Treatment System, Proposed
Residence, Lot 1, Teller Springs Subdivision, 1711 County Road 109, Garfield
County, Colorado
Dear Brent:
A representative of H-P/Kumar observed the installation of the Onsite Wastewater Treatment
System (OWTS) for the residence under construction at the subject site as required by the
Garfield County Building Department. Our observations and recommendations are presented in
this report. The services are supplemental to our agreement for professional services to Ridge
Runner Construction dated March 5, 2018.
H-P/Kumar previously designed the OWTS for the residence as submitted in our report dated
September 4, 2018, Project No. 18-7-187.02. The system was designed for three bedrooms. The
OWTS was installed under Garfield County Permit Number SEPT -05-18-5240 by Brent Lough.
We performed our As -Built evaluation on September 17 and 20, 2018. During the two visits, the
OWTS components observed included: sewer line, cleanouts, septic tank, effluent line,
distribution box and soil treatment area (STA) and the locations of these components. The
installation and locations of the system components were verified as shown on Figure 1. Pictures
of the OWTS components made during our site visits are also included with this report.
At the time of our design, the location of the water service line was unknown. During
installation, the STA was rearranged to maintain the required minimum 25 -foot setback from the
water line Infiltrator Arc 36 chambers were used instead of Infiltrator Quick 4 Plus Standard
chambers. The number of chambers was reduced to 36 total due to the larger area of the Arc 36
chambers for a total soil treatment area of 540 square feet (design size was 528 square feet).
Ridge Runner Construction
November 6, 2018
Page 2
The effluent line was encased in 6" diameter C900 pipe for 10 feet on either side of crossing of
the water line as discussed with Brent Lough and shown in a picture provided us, see attached
picture log. The septic tank size was increased to 1,250 gallons from 1,000 gallon size
recommended in our design. The distribution box was changed to a Tuf-Tite 7 -hole distribution
box to accommodate the increased number of rows of chambers. The noted changes from our
design are acceptable to us.
It is our opinion that the OWTS was installed in general conformance with the above referenced
design.
The observations and recommendations presented above are based on our site observations and
our experience in the area. We make no warranty either express or implied. Alterations to the
system or improper backfill and site grading could affect the operation and effectiveness of the
OWTS.
Please feel free to contact us if you have any questions regarding this letter.
Respectfully,
Shane M. Mello, Staff Engineer
Reviewed by:
David A. Young, P.E. 2�':
16 ,;iv •
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attachments: Figure 1 — OW'1r� � 1 Drawing
OWTS M -Built Photograph Log
SMM/ksw
H -P KUMAR
Project No. 18-7-187.02
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LEGEND:
• PROFILE PIT
A PERCOLATION TEST HOLE
APPROXIMATE SCALE
1 INCH = 50 FEET
0
25
50
75
100
18-7-187.02 H -P- KUMAR
AS -BUILT OWTS SITE PLAN
Fig. 1
OWTS AS -BUILT PHOTOGRAPH LOG
PROPOSED RESIDENCE
LOT 1, TELLER SPRINGS SUBDIVISION
1711 COUNTY ROAD 109
GARFIELD COUNTY, COLORADO
U
1
4
1
Photograph 1: Two chamber,
1,250 gallon Valley Precast
septic tank
Photograph 2: Effluent line
exiting septic tank
Project No. 18-7-187.02
OWTS AS -BUILT PHOTOGRAPH LOG
PROPOSED RESIDENCE
LOT 1, TELLER SPRINGS SUBDIVISION
1711 COUNTY ROAD 109
GARFIELD COUNTY, COLORADO
Photograph 3: Septic tank
outlet tee with effluent filter
Photograph 4: Tuf-Tite 7 -hole
distribution box and effluent
lines going towards soil
treatment area (STA).
Project No. 18-7-187.02
OWTS AS -BUILT PHOTOGRAPH LOG
PROPOSED RESIDENCE
LOT 1, TELLER SPRINGS SUBDIVISION
1711 COUNTY ROAD 109
GARFIELD COUNTY, COLORADO
Photograph 5: Tuf-Tite 7 -hole
distribution box with Speed
Levelers installed. Plugs are
installed in unused holes.
Photograph 6: Typical trench
and Infiltrator Arc 36 chambers.
Inspection port installed in far
end of trench.
Project No. 18-7-187.02
OWTS AS -BUILT PHOTOGRAPH LOG
PROPOSED RESIDENCE
LOT 1, TELLER SPRINGS SUBDIVISION
1711 COUNTY ROAD 109
GARFIELD COUNTY, COLORADO
Photograph 7: Effluent line
encased in larger diameter pipe
over water line crossing.
Project No. 18-7-187.02