2019-07-16_REVISION - M1988108

• Permit No: M1988108
• IBM Index Class Name: REVISION
• Doc Date: 7/16/2019
• Doc Name: Incompleteness Response
• From: Arcosa LWB
• To: DRMS
• Type & Sequence: SO3
• Email Name: ECS
• Media Type: D
• Archive: No

Geosyntec "
consultants Page 8 of 12
Client: Arcosa LWB Project Permit Amendment Project No.: DE0374 Task: Exhibit S—Structures Evaluation
Written by: Jonathan Gillen Date: 7/8/2019 Reviewed by: Youngmin Cho Date: 7/9/2019
Approved by: Poppy Staub Date: 7/15/2019
slopes is above the minimum target FS, it is assumed that this structure is safe from damage due
to active mining operations.
Structure #4-Billboard 2
This structure is an advertisement billboard owned by Lamar Advertising adjacent to the east side
of Highway 93 near the Arcosa processing facility. This stricture is approximately 570 feet from
the east slope of the mine pit. Because the factors of safety for a stricture closer to the mine pit
slopes is above the minimum target FS, it is assumed that this structure is safe from damage due
to active mining operations.
Structure #5 -Billboard 3
This structure is an advertisement billboard owned by Lamar Advertising adjacent to the east side
of Highway 93 near the Arcosa processing facility. This structure is approximately 650 feet from
the east slope of the mine pit. Because the factors of safety for a structure closer to the mine pit
slopes is above the minimum target FS, it is assumed that this structure is safe from damage due
to active mining operations.
Structure #6-Abandoned Railroad Car
This structure is owned by Arcosa and sits on the east side of Highway 93 within the permit
boundary. This structure is approximately 600 feet from the east slope of the mine pit. Because the
factors of safety for a structure closer to the mine pit slopes is above the minimum target FS, it is
assumed that this structure is safe from damage due to active mining operations.
Structure # 7-Arcosa Fence line
This is a wood post and barbed-wire fence that generally encompasses the west side of the permit
boundary around the quarry.It is owned and maintained by Arcosa.This structure is approximately
78 feet from the east slope of the mine pit at its nearest point (i.e., within the Highway 93 ROW).
The factors of safety for this stricture is above the minimum target FS,as it is within the Highway
93 ROW, which was evaluated as part of the stability model discussed above. Since other portions
of this structure around the Site are farther from the mine pit,those portions are assumed to be safe
from damage due to active mining operations.
Structure #8- Overhead Power Lines
This stricture is owned by Excel Energy and consists of wooden or metal power poles and
electrical power lines. Like the fence line, this structure traverses' portions of the site within the
Highway 93 ROW and around other portions of the site. This stricture is approximately 105 feet
from the east slope of the quarry. Because the factors of safety for a structure closer to the mine
Structures Evaluation
Arcosa LWB Plan—Permit Amendment 2019-07-16