2016-01-19_HAI_Remediation Risk_Truck Traffic

VM
MEMORANDUM
19 January 2016
File No. 42058-002-01
TO: Duke Energy
Richard Baker
FROM: Haley & Aldrich, Inc.
Lisa JN Bradley, PhD, DABT
SUBJECT: Risk of Remediation —Truck Traffic
HALEY & ALDRICH, INC.
360 Quaker Street
Northbridge, MA 01534
978-846-3463
Excavation of a coal ash basin is one alternative considered for the low -to -intermediate and low draft
risk ranked sites by the North Carolina (NC) Department of Environmental Quality (DEQ). One
consideration for evaluating remedial alternatives is the "risk of remedy," i.e., what risks to workers and
the public are associated with the remedial action. Excavation entails removal of the material in an ash
basin, and then transportation to an off-site repository. This memorandum addresses the potential risks
associated with truck traffic between the ash basin and the off-site repository.
The risks of fatality and injury due to truck traffic associated with an ash basin excavation project are
shown on Table 1. Information on annual fatalities and injuries associated with truck traffic was
gathered from the Bureau of Labor Statistics. Information on truck miles travelled per year was
gathered from the Department of Transportation. Details are provided in the table and footnotes.
Duke Energy estimates that excavation of a given ash basin could conservatively require 25 years,
assuming work is conducted 6 days per week for 45 weeks per year (to allow for inclement weather). It
is assumed that 50 trucks per day would make two 50 -mile round trips hauling ash to an off-site
repository located approximately 25 miles from the excavation.
The results predict 0.12 truck -related fatalities per excavation; this equates to one potential fatality per
10 ash basin excavation projects. The results predict that there could be approximately 16 truck -related
injuries associated with an ash basin excavation project.
Note that Duke Energy is committed to worker health and safety. These estimates are based on
national statistics and can be used to help inform the remedy decision process.
www.haleyaldrich.com

Table 1
Estimation of Truck Traffic Related Fatalities and Injuries
Ash Basin Risk of Excavation Remedy Evaluation
Duke Energy
January 2016
Published Information
Ash Basin Remedy Estimates
Employee Injuries
Estimated
Large Truck Miles
Employee
Number of
Number of Truck
Estimated Truck
Estimated Truck
and Illnesses in
Fatality Rate per
Injury Rate per
Number of Years
Traveled per Year
Fatalities in NAICS
Excavation Truck
Miles Per
Fatalities per
Injuries per
NAICS 484
Truck Mile
Truck Mile
per Ash Basin
(millions)
484 (Trucking)
Miles per Year
Excavation
Excavation
Excavation
(Trucking)
(e)
(f)
Excavation
(c)
(d)
(a) (b)
(g)
(h)
(i)
(d)
(a)
275,018
493
66,000
1.79E-09
2.40E-07
2,700,000
25
67,500,000
0.12
16.20
Notes:
NAICS - North American Industry Classification System
(a) - Inputs provided by Duke Energy:
Trucks: 20 tons/truck
100 trucks
2 truck turns/day
25 miles from the site to the repository
Operations: 45 weeks/year (allows for inclement weather)
6 days/week
= 270 days per year
25 years per ash basin excavation
50 miles round trip
270 days per year
(b) - Calculated: Truck miles per year = 100 trucks * 2 turns per day * 50 miles round trip * 270 days per year
(c) - Fact Sheet, Traffic Safety Facts 2013 Data. NHTSA's National Center for Statistics and Analysis, DOT HS 812 150, Washington, DC, revised June 2015.
(d) - Bureau of Labor Statistics. 2014. Occupational Injuries and Illnesses 2014 News Release. U.S. Bureau of Labor Statistics. U.S. Bureau of Labor Statistics, 29 Oct. 2015.
Accessed 19 January 2016. Available at: http://www.bls.gov/news.release/archives/osh_10292015.htm
(e) - Calculated: Fatality Rate = Employee fatalities / (large truck miles traveled per year in millions * 1,000,000)
(f) - Calculated: Injury Rate = Employee injuries / (large truck miles traveled per year in millions * 1,000,000)
(g) - Calculated: Truck miles per excavation = truck miles per year * total number of years
(h) - Calculated: Fatalities per excavation = total number of truck miles per excavation * fatality rate
(i) - Calculated: Injuries per excavation = total number of truck miles per excavation * injury rate