HomeMy WebLinkAboutEngineer's OWTS Design PlanGgoQugs te70l 31 8-67S4
P0 Bor 1 372
Rifte. CO 81650
geotquestco(Dpm.me
Geo Quest Project No. 24-L61
Date:8/4/24
Down Valley Septic and Drain lnc.
PO Box 1967
Rifle, CO 81650
970-904-0473
smsewer@yahoo.com
RE: Onsite Wastewater Treatment System (OWTS)-Detailed Soil lnvestigation
Dear Down Valley Septic and Drain,
Geo Quest was asked to perform a soil evaluation for a new OWTS at the property located east of Rifle,
Colorado at28487 US 6. This memo presents the investigation details and USDA soiltype encountered at
the residence on Saturday, August 3,2024. This information may be used in OWTS design.
Two soil profile test pits, identified as Test Pit l- (TP-l) and TP-2, were excavated on the north side of the
property at or near the proposed OWTS area. The excavations were completed with a Bobcat mini exca-
vator to depths of 9 feet below ground surface.
Representative soil samples were collected at multiple depths as appropriate. These samples were evalu-
ated by Geo Quest using the USDA Soil Texture and Structure methods. Generally, the soil in both exca-
vated test pits correlates to a Type 34, Silty Clay Loam, based on CDPHE, Regulation No. 43, Table 1-0-1 as
presented below.
Ground water was not encountered in the excavations at the time of the investigation. Neither bedrock
nor a limiting layer were encountered to the depths explored.
Soil Treatment Area Long-Term Acceptance Rates by Soil Texture, Soil Structure, Percolation Rate and
Treatment Level
SoilType USDA Soil
Texture
USDA Soil
structure-Type
USDA Soil Structure-
Grade
Treatment level1
(MPl)
Treat-
ment
Level 1
3
Silty Clay
Loam Massive 1-Weak 4!-60 0.35
Respectfully su bmitted,
Kevin E. Dye, P.E
Principal
Geo Quest, LLC
DO
814124
571 39
Attachments: Project Site and Test Pit Location Map, Test Pit Logs
GEoGluss (970) 318-6784
PO Box 1 372
Rifte. C0 81650
georluestco@pr1r.nle
Approximate Project Site and Test Pit Location map
Project Location
Rifle
r{
s$
Yellow Highlight
Between Test Pits
Shows Proposed
OWTS Location
GgoGlussr {970} 31 8-6784
PO Box 1 372
Rifte. CO 81650
geoquestco@pm.me
Project Numbeti 24-161
on
citv, stale: Rllle uountv: Ganreld
GEO QUeS:t
Station, Offset:
Date:8/3/24 Time: ts:20 am
Sketch 0f Sudace Conditions and Surrouncling
lelative Features.
=ast
Test Pit
eer:
None
e:
Detlth
(feet )
SamDle
]!pe {1)
feet
J
.9
o
N'
Elevation
EXAMPLE: Sand y CLAY FILL, lr r0wn-lig ht g ray, low p laslic, m0ist, stitr l0 v ery
slilf, organlcs, calcareous, odor
VERY IMPORTANTI! MARK CHAI{GE II{ SOIL IN CRAPHIC LOG
cRAVEL. sand. silt. road base. FILLGM
1
sc SAND, siit, clav, trash/debrls, FILL
SAND. silt. clav. ian. moist5SC
Bottom of borino at 9 feet
Soil classification in loq is based on visual-manual
methods of ASTM D2488
I
IIII
MC=Modified california Liner, 5T=shelhy Tulre, GB=GrablBulk sample
GEoQugsr {970) 318-6784
P0 Box 1 372
Rifte. CO 81650
geo(luestco@pnr.n'le
rroject Number' 24-161
c 0nect Name. Down
Rifle
Itation. Offs€t:
ons:ear -s0
-late: 8/3/24 Time: g:05 am
iketth 0f Surface Conditions and Surrounrlin6
lelative Features. WBst Test Pit
eer: Kevin
:xcavation. TP-2 Paoe 1 ':f 1e
e.
None
Depih
(hd)
5am pie
Ttpe (1)
feet
NO
Flevatinn
s-3g
sandy oLAY FILL, bf0wn-llghl gray,low plastic, m0isl, sllfr t0
slifl, organics, calcareous, Bdor
VERY IMPORTANTII MARI( CHANOE IN SOIL II{ GRAFHIC LOG
0 to 6 inches Road BaselPit Run
1 sc
SAND. silt. clav, qravel. tan. moisi. brown. low olasticitv
D
5 SAND. silt. clav, tan. moist. low Dlasticitv
SC
o
Bottom of bonno at 9 feet
Soil classifrcation in loq is based on visual-manual
nrethods of ASTM D2488
I
II
MC=M0dif ied c alifornia Line r, gr=shetb y Tut)e, GE=Gratr/Butk 5n rnptE
GEoQugst (970] 31 8-6784
PO Box 1 372
Rifte. CO 81650
geocq u estc o(*rlprlt. nre
View of TP-l looking north
GEoGluesr (970) 318-6784
PO Box 1 372
Rifle, CO 81650
geocluestco@prn.me
TP-1 excavated to 9 feet
GEOQUSX
(970) 31S-6784
PO Box 1 372
Rifle, C0 81650
geoquestco@prn.me
View looking at side wall of TP-l