HomeMy WebLinkAboutInstallation Observation Letter 06.20.24
5020 County Road 154
Glenwood Springs, CO 81601
phone: (970) 945-7988
fax: (970) 945-8454
email: kaglenwood@kumarusa.com
www.kumarusa.com
Office Locations: Denver (HQ), Parker, Colorado Springs, Fort Collins, Glenwood Springs, and Summit County, Colorado
June 20, 2024
James Gornick Building Specialists
Attn: Jim Gornick
1005 Cooper Avenue
Glenwood Springs, Colorado 81601
Jgornick1988@gmail.com
Project No. 23-7-407.02
Subject: Certification of Onsite Wastewater Treatment System, Proposed Residence,
Lot 1, River Ridge, 38 River Ridge Drive, Garfield County, Colorado
Dear Jim:
A representative of Kumar & Associates observed the installation of the Onsite Wastewater
Treatment System (OWTS) for the residence at the subject site as required by the Garfield
County Environmental Health Department. Our observations and recommendations are
presented in this report. The services are supplemental to Kumar & Associates agreement
for professional services to James Gornick Building Specialists dated August 18, 2023.
We previously designed the OWTS for the residence as submitted in our report dated
September 8, 2023, Project No. 23-7-407.02. The system was designed for three bedrooms.
We performed our as-built evaluations on November 30, 2023 and June 19, 2024. The OWTS
components observed included: sewer lines, cleanouts, septic tank, effluent line, pump, control
panel 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 the site visits are included with this report. The distance locations to
the septic tank shown on Figure 1 were made by taping.
On November 30, 2023, a sample of the secondary sand media was obtained and the results
of gradation analysis test are attached. On June 19, 2024, after power had been supplied to the
pump, a pump performance test was performed with adequate pump pressure observed.
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.
Kumar & Associates
GRADATION ANALYSIS TEST
LABORATORY TEST REPORT DATA
Laboratory
Client:
Location / Plant:
Sample / Product:
Sample Date:
Lab Test Date:
Job Number:
SIEVE SIEVE OPENING IN
MILLIMETERS
PERCENT
PASSING THRU
SIEVE
3"75 100.0
1.5 37.5 100.0
3/4"19 100.0
3/8"9.5 100.0
No. 4 4.75 100.0
No. 8 2.36 99.0
No. 16 1.18 86.0
No. 30 0.6 57.0
No. 50 0.3 23.0
No. 100 0.15 7.0
No. 200 0.075 3.0
GRADATION RESULTS COMPARED TO PREFERRED AND SECONDARY SAND FILTER SPECIFICATIONS
Value Units
Preferred
Sand Value
Pass / Fail
Preferred
Sand
Secondary
Sand Value
Pass / Fail
Secondary
Sand
0.66 millimeters
0.178 millimeters 0.25 to 0.60 FAIL 0.15 to 0.60 PASS
3.71 unitless ratio < or = 4.0 PASS < or = 7.0 PASS
3.0 millimeters < or = 3 PASS < or = 3 PASS
Uniformity Coefficient (D60 / D10)
Percent passing thru #200 Sieve
11/30/2023
23-7-407.02
Parameter
D60 - Diameter that 60 percent of the sample is
finer than.
Effective Size - D10 - Diameter that 10 percent
of the sample is finer than.
Kumar Glenwood Springs
James Gornick Building Specialists
Western Slope Material - Carbondale
Secondary Sand
11/30/2023
0
10
20
30
40
50
60
70
80
90
100
0.01 0.1 1 10 100
Pe
r
c
e
n
t
P
a
s
s
i
n
g
S
i
e
v
e
Diameter of Particle in Millimeters
Plot of Gradation Analysis
3"1.5"3/4"3/8"#4#8#30#50#100#200 #16
OWTS PHOTOGRAPH LOG
PROPOSED RESIDENCE
LOT 1, RIVER RIDGE
38 RIVER RIDGE DRIVE
GARFIELD COUNTY, COLORADO
Project No. 23-7-407.02
Photograph 1: Valley Precast
1,000-gallon, 3 chamber septic
tank.
Photograph 2: Effluent Line
from septic tank to soil treatment
area (STA).
OWTS PHOTOGRAPH LOG
PROPOSED RESIDENCE
LOT 1, RIVER RIDGE
38 RIVER RIDGE DRIVE
GARFIELD COUNTY, COLORADO
Project No. 23-7-407.02
Photograph 3: Pump installed
in the third chamber of the septic
tank.
Photograph 4: Soil treatment
area (STA) with gravel and
piping exposed.
OWTS PHOTOGRAPH LOG
PROPOSED RESIDENCE
LOT 1, RIVER RIDGE
38 RIVER RIDGE DRIVE
GARFIELD COUNTY, COLORADO
Project No. 23-7-407.02
Photograph 5: Control panel.