HomeMy WebLinkAbout OWTS Soil Evaluation
Geo Quest Project No. 24-157
Date: 5/27/24
Stephen Self
Parcel No. 217903100006
1098 214 County Road
Silt, CO 81652
970-274-0064
stephen@willowwisp.net
RE: Onsite Wastewater Treatment System (OWTS) Soil EvaluaƟon
Dear Mr. Self,
Geo Quest was asked to perform a soil evaluaƟon for OWTS improvements at the residence located at
1098 214 County Road in Silt, Colorado. This memo presents the invesƟgaƟon details and USDA soil type
encountered at the residence on Saturday, May 25, 2024. This informaƟon may be used in OWTS design.
Two borings, idenƟfied as Boring B-1 and Boring B-2, were drilled south of the residence at or near the
proposed improvement area. The borings were drilled with a truck mounted, Giddings #25 drill rig using
4-inch conƟnuous flight augers. Both borings were drilled to depths of 10 feet with both drive and bulk
samples collected at selected intervals.
The drilling condiƟons and drill cuƫngs were conƟnuously monitored for material changes. AddiƟonally,
soil samples were collected at depths of 3 feet and 9 feet in B-1 and 4 feet and 9 feet in B-2. These sam-
ples were evaluated by Geo Quest using the USDA Soil Texture and structure methods. Generally, the soil
in both borings correlates to a Type 3A, Clay Loam, based on CDPHE, RegulaƟon No. 43, Table 10-1 as
presented below.
Ground water was not encountered in the borings at the Ɵme of the invesƟgaƟon. Neither bedrock nor a
limiƟng layer were encountered to the depths explored.
Soil Treatment Area Long-Term Acceptance Rates by Soil Texture, Soil Structure, PercolaƟon Rate and
Treatment Level
Soil Type USDA Soil
Texture
USDA Soil
Structure-Type
USDA Soil Structure-
Grade
Treatment Level 1
(MPI)
Treatment
Level 1
3A Clay Loam Massive 1-Weak 61-75 0.30
Respecƞully submiƩed,
Kevin E. Dye, P.E.
Principal
Geo Quest, LLC
AƩachments: Boring LocaƟon Map, Logs
5/27/24
Approximate Boring LocaƟon map
B-1
B-2
Yellow Highlight
Shows Proposed
OWTS Improvement
Area
Silt
Project LocaƟon
SPT=Split Spoon, MC=Modified California Barrel, ST=Shelby Tube, GB=Grab/Bulk Sample
SPT=Split Spoon, MC=Modified California Barrel, ST=Shelby Tube, GB=Grab/Bulk Sample