2021-10-29_PERMIT FILE - M2021064 ‎(6)‎

• Permit No: M2021064
• IBM Index Class Name: Permit File
• Doc Date: 10/29/2021
• Doc Name: Application
• From: C & J Gravel Products, Inc
• To: DRMS
• Email Name: LJW
• Email Name: THM
• Media Type: D
• Archive: No

M-4-A Traffic Impact Study
Scope: This study examines traffic generation and distribution at the Oakbrush Hill
Gravel operation on the Dutton Ranch, and specific impacts on CR-600 (Piedra Road) and
provides data for the CDOT Level III traffic study for the intersection of CR-600 and SH-160.
This copy omits all appendices and annexes. CDOT study will be provided to DRMS and
County when completed.
Executive Summary
Purpose: To evaluate the impacts of the Oakbrush Hill (Former FSR-650) (aka Dutton Ranch)
access on the surrounding highway system.
Setting: The operation is located in Archuleta County, Colorado, approximately 4 miles
northwest of Pagosa Springs on CR-151 at milepost 3.785 Right. The operation will be limited
to producing 72,000 tons of sand and gravel per year. The entrance is an existing improved
access used in the past for ranch (ag) access by the Dutton Ranch, the USFS and contractors
for access to gravel operations on the parcel and following the 20-year-life of this operation, will
revert to ag access.
Principal findings:
1. Site distance at the driveway proposed for improvement is adequate.
2. No auxiliary lanes are warranted at the driveway; as traffic through the intersection
will be less than 10 pvph in all peak hours.
3. Impacts on CR-600 and other roadways in the study area are low, with increases in
traffic of less than 10% of existing counts (146 pve of 5300).
4. Impacts on SH-160 located 3.785 miles to the South are minimal, for(a)traffic
increases significantly less than the 14,000 AADT (2020)for SH-160 and (b) the
intersection is fully developed (all auxiliary lanes) and fully signalized.
5. Improvements to former FSR-650 are not warranted: the intersection meets current
geometric standards for grade and approach.
6. Traffic generated by this proposed development is significantly less than 100 DHV
(design hour volume) at 37 pve.
Introduction
1. Existing land use, site and study area boundaries
a. Existing land use: The parcel (Dutton Ranch or Oakbrush Hill) currently is zoned
agricultural and is currently used for ranching. In the past, the USFS directly or by
contract operated separate, limited-impact sand and gravel pits on the property (which
used this access road), and provided some limited support to the former Job Corps (later
USFS Work Center) located further north on CR-600. Other parcels of the Dutton Ranch
are accessed through this point, but no other properties are accessed here.
b. The access and site is primarily in the Northeast Quarter of Section 06 of T35NR2W,
amounting to approximately 163 acres total affected area, but only about 5 acres shall
be mined at any one time plus plant/stockpile area and roads.
c. The study area is bounded by the intersection with SH-160 at MM CR-F.50 at MM
141.15L (to the south) and the intersection of FSR-629 at MM 6.50R to the north.
2. Proposed site uses
As currently proposed, the 163-acre site will be used for sand and gravel pit to be located on
the east face of Oakbrush Hill. Ranching operations will also continue; grazing may be done
in areas not being mined. Mining will be limited to approximately 15 acres at any one time
(using up to 10 acres of plant and stockpile area (of 11.9 acres affected) and 5 acres of
working floor/face) by CDRMS permitting and bonding, based on an estimated design
production of up to 72,000 tons/year shipped from the site (by CPDHE-APCD APEN/permit
limit and County permits). Access to other Dutton Ranch grazing land to the east will be
provided through this site.
3. Existing and proposed uses in vicinity of the site
C&J Gravel Products, Inc. Page 64 of 93 20 OCT 2021
Application for Permit: Oakbrush Hill Gravel M-2021- C&J-DPR-V5-001