HomeMy WebLinkAboutOWTS Soil Report-Revised
Geo Quest Project No. 24-161
Date: 8/4/24
Revised: 9/5/24
Down Valley SepƟc and Drain Inc.
PO Box 1967
Rifle, CO 81650
970-904-0473
smsewer@yahoo.com
RE: Onsite Wastewater Treatment System (OWTS)-Detailed Soil InvesƟgaƟon
Dear Down Valley SepƟc and Drain,
Geo Quest was asked to perform a soil evaluaƟon for a new OWTS at the property located east of Rifle,
Colorado at 28487 US 6. This memo presents the invesƟgaƟon details and USDA soil type encountered at
the residence on Saturday, August 3, 2024. This informaƟon may be used in OWTS design.
Two soil profile test pits, idenƟfied as Test Pit 1 (TP-1) and TP-2, were excavated on the north side of the
property at or near the proposed OWTS area. The excavaƟons were completed with a Bobcat mini exca-
vator to depths of 9 feet below ground surface.
RepresentaƟve soil samples were collected at mulƟple 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 3, Silty Clay Loam, based on CDPHE, RegulaƟon No. 43, Table 10-1 as
presented below.
Ground water was not encountered in the excavaƟons 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, Percola Ɵon Rate and
Treatment Level
Soil Type USDA Soil
Texture
USDA Soil
Structure-Type
USDA Soil Structure-
Grade
Treatment Level 1
(MPI)
Treat-
ment
Level 1
3 Silty Clay
Loam Granular Moderate 41-60 0.35
Respecƞully submiƩed,
Kevin E. Dye, P.E.
Principal
Geo Quest, LLC
AƩachments: Project Site and Test Pit LocaƟon Map, Test Pit Logs
9/5/24
Approximate Project Site and Test Pit LocaƟon map
TP-1
TP-2
Yellow Highlight
Between Test Pits
Shows Proposed
OWTS LocaƟon
Rifle
Project LocaƟon
View of TP-1 looking north
TP-1 excavated to 9 feet
View looking at side wall of TP-1