HomeMy WebLinkAboutAs-built 09.15.2016H-P�KUMAR
Geotechnical Engineering' Engineering Geology
Materials Testing 1 Environmental
5020 County Road 154
Glenwood Springs, Colorado 81601
Phone: (970) 945-7988
Fax (970) 945.8454
Email: hpkglenwood@kumarusa.com
September 15, 2016
Doug Button
P. O. Box 149
Silt, Colorado 81652
buttonranch@gmail.com
Office Locations: Parker, Glenwood Springs, and Siiverthome, Colorado
Project No. 16-7-200
Subject: As -Built Evaluation of Onsite Wastewater Treatment System, Proposed
Residence, Parcel 11, Section 21, 178 Broken Yoke Drive, South of Silt,
Garfield County, Colorado
Dear Doug:
As requested, H-P/Kumar observed the installation of the Onsite Wastewater Treatment System
(OWTS) for the proposed residence 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 Hepworth-Pawlak Geotechnical's (now HP/Kumar) agreement for
professional services to you dated December 31, 2014. We previously designed the OWTS and
presented the recommendations in a report dated May 31, 2016, Job No. 114 553A.
We performed the As -Built evaluation on July 12, August 15 and September 7, 2016. The
OWTS components observed included: sewer pipe, cleanout, sewage lift station, sewage lift
station pump operation, septic tank, effluent transport pipe, distribution box, soil treatment area
and the locations of these components. Several modifications to our design were implemented
by the installer as outlined below. The modifications were verbally approved by us prior to
installation and will not change the overall performance of the design. It is our opinion that these
modifications will not alter the effectiveness of the OWTS.
• A 1,050 gallon Precast Concepts septic tank and concrete distribution box were installed
instead of the components specified in the design. These components are considered
suitable equivalents.
• The septic tank, distribution box and STA were rotated and relocated further to the east as
shown in Figure 1. The soils at the STA were similar to those encountered in the profile
pits and consisted of Loam. This is acceptable for our design.
• A Liberty Pumps sewage pump and sewage lift station basin were used instead of the
system recommended in the design. The Liberty Pumps LE41 pump meets the pump
performance design requirements. The Liberty Pumps 41 -gallon Pro 380 sewage lift
station basin is smaller than the basin specified in the initial design, but is suitable for the
OWTS with careful monitoring by the homeowner. The sewage lift station alarm was
verified by us.
The installation and locations of system components were verified as shown on Figure 1.
Photographs of the OWTS installation are provided in the attached Photograph Log.
H -P KUMAR
Project No. 16-7-200
Doug Button
September 15, 2016
Page 2
It is our opinion that the OWTS was installed in general conformance with the May 31, 2016
design with the exceptions listed above.
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,
H -P: KUMAR
j(116Z
Jason A. Deem, Project Geologist
Reviewed by:
..Me4;10 lo \
David A. Young, P.C.:: :'' G:
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attachments Figure 1 - As�►p'lan
OWTS As -Built Photograph Log
H -P KUMAR
Project No. 16-7-200
SOIL TREATMENT AREA
CONSISTING OF TWO ROWS
OF 18 INFILTRATOR QUICK 4
PLUS STANDARD CHAMBERS
IN EACH TRENCH
CONCRETE DISTRIBUTION BOX
PROFILE PIT 3
PROF PIT 2
APPROXIMATE SCALE
1 INCH 30 FEET
1,050 GALLON. TWO
CHAMBER SEPTIC TANK
20' MINIMUM SECTION OF
SCH. 40 PVC PIPE PRECEDING
THE SEPTIC TANK
■PROFILE PIT 1
2 -INCH DIAMETER SCH 40
PVC SEWER FORCE MAIN
24 -INCH SEWAGE
LIFT STATION BASIN
1
650 TO PROPERTY LINE
1
GARAGE
PROPOSED
RESIDENCE
PORCH
27�51ETO PROPERTY
16-7-200
H-P%KUMAR
AS -BUILT SITE PLAN
Fig. 1
OWTS AS -BUILT PHOTOGRAPH LOG
PARCEL 11, SECTION 21
178 BROKEN YOKE DRIVE, GARFIELD COUNTY, COLORADO
Photograph 1:
Sewage lift station
pump.
Photograph 2:
Sewage lift station
labeling detail.
Photograph 3:
Interior sewer line
labeling prior to
entering sewage lift
station.
14-PtKUMAR
Project No. 16-7-200
OWTS AS -BUILT PHOTOGRAPH LOG
PARCEL 11, SECTION 21
178 BROKEN YOKE DRIVE, GARFIELD COUNTY, COLORADO
Photograph 4:
Sewage lift station.
Photograph 5: Sewer
line and sewage Iift
station.
H -P t KUMAR
Project No. 16-7-200
OWTS AS -BUILT PHOTOGRAPH LOG
PARCEL 11, SECTION 21
178 BROKEN YOKE DRIVE, GARFIELD COUNTY, COLORADO
Photograph 6: Sewer
discharge pipe and
check valve exiting
sewage lift station.
Photograph 7:
Interior sewer pipe
labeling after exiting
sewage Iitt station.
H -P = KUMAR
Project No. 16-7-200
OWTS AS -BUILT PHOTOGRAPH LOG
PARCEL 11, SECTION 21
178 BROKEN YOKE DRIVE, GARFIELD COUNTY, COLORADO
ti
Photograph 8: Alarm
float in sewage lift
station basin
(contractor photo)
Photograph 9:
Distribution box with
speed levelers
(contractor photo)
H -P KUMAR
Project No, 16-7-200
OWTS AS -BUILT PHOTOGRAPH LOG
PARCEL 11, SECTION 21
178 BROKEN YOKE DRIVE, GARFIELD COUNTY, COLORADO
Photograph 10:
Precast Concepts
septic lank.
Photograph 11: STA
Infiltrator chambers.
Photograph 12: STA
Infiltrator chambers
with effluent pipe inlet,
H -P I. KUMAR
Project No. 16-7-200
OWTS AS -BUILT PHOTOGRAPH LOG
PARCEL 11, SECTION 21
178 BROKEN YOKE DRIVE, GARFIELD COUNTY, COLORADO
14' YY1 .1.+1
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rte,
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Photograph 13:
Septic tank and sewer
line from lift station
pump.
Photograph 14:
Septic tank location in
relation to residence.
H -P t KUMAR
Project No. 16-7-200