HomeMy WebLinkAboutOWTS Certification Letter and As-built Drawing 10.30.25
Jeff Davis, Director, Colorado Parks and Wildlife
Parks and Wildlife Commission: Dallas May, Chair ∙ Richard Reading, Vice-Chair ∙ Karen Bailey, Secretary ∙ Jessica Beaulieu
Marie Haskett ∙ Tai Jacober ∙ Jack Murphy ∙ Gabriel Otero ∙ Murphy Robinson ∙ James Jay Tutchton ∙ Eden Vardy
Northwest Region Capital Development Office
711 Independent Ave • Grand Junction, CO 81505
PH: (970) 255.6100
October 30, 2025
Ted White
Garfield County Public Health
2014 Blake Avenue
Glenwood Springs, CO 81601
Rifle Gap State Park OWTS Replacement – Built In Conformance
Dear Ted,
Installation of the replacement OWTS and new 2,000 gallon septic tank at Rifle Gap State Park was completed
on October 1, 2025. Installation was authorized under Garfield County Public Health Permit # SEPT-9278.
Approved design plans were used for construction of the replacement OWTS and construction inspections were
completed by Eric Blake, P.E. The OWTS was installed in general conformance with the design plans, with
approved substitutions as follows:
• Arc 36 chambers were installed instead of the specified Quick4 chambers. This resulted in a total of 160
chambers installed in 8 rows instead of the specified 200 chambers installed in 8 rows. The Arc 36
chambers have a longer chamber length, and therefore, the specified total row length of 100 feet was
still achieved as well as the necessary 2,400 square feet of soil treatment area.
• A Valley Precast 2000T-2CP was installed instead of the Valley Precast 2000T-1CP. Both tanks are on
the approved list from CDPHE’s list of Accepted Septic Tanks for Use in Colorado On-Site Wastewater
Treatment Systems and meet the requirements of 43.9 B of Garfield County On-Site Wastewater
Treatment Systems (OWTS) Regulations.
• The effluent filter identified in the design plans was determined to be undersized prior to construction.
An Orenco FT0854-36A effluent filter was installed in order to accommodate the 1,970 gpd design
flow.
All installation was functioning as intended and installed in conformance with the plans and design intent. As-
Built documents identifying the above-mentioned changes are attached.
Sincerely,
Eric Blake, P.E.
Northwest Region Project Manager