City of Loveland Wastewater Treatment Plant - Executive Summary
CITY OF LOVELAND WASTEWATER TREATMENT PLANT |
Release Prevention and Emergency Response Policies
The City of Loveland, Colorado (City) takes a very active approach in maintaining and
improving chemical safety. The City has demonstrated its commitment to safety by
upgrading the chemical feed process at the Wastewater Treatment Plant (WWTP) in early
1999 from a gas pressure system to a vacuum system mounted directly on chlorine
cylinders, which decreases system maintenance dramatically and therefore reduces the
potential for chlorine leaks.
Facility and Regulated Substance
The City's WWTP is located in the southeaster portion of the City at 920 South Boise Avenue.
Chlorine is used at the facility to provide disinfection of treated wastewater effluent prior to
discharge into the Big Thompson River. Chlorine is stored in one-ton cylinders, and no more
than two cylinders of chlorine (4,000 pounds) are stored at the WWTP.
Worst Case and Alternative Case Release Scenario
The worst case release scenario involves the loss of 2,000 pounds of chlorine from a
single cylinder of chlorine outside of any enclosure. The rule for worst case release
analysis assumes all of the contents are released in 10 minutes. The alternative case
release scenario was based on process hazard analysis, and involves the release of
600 pounds of chlorine in 60 minutes as a result of a fusible plug failure. The distance to
endpoint for both scenarios was analyzed using RMP*Comp(an EPA program), and the
analyses resulted in a worst case release scenario distance to endpoint of 1.3 miles and
an alternative case release scenario distance to endpoint of 0.1 miles.
Accidental Release Prevention Program
The accidental release prevention program complies with the requirements for Program
Level 2 processes. The prevention program includes an employee training program
based on the written operating procedures for the WWTP, as well as an aggressive
maintenance, inspection, and testin
g program for equipment utilized within the covered
process. These programs all serve to prevent or minimize unintended releases of
Five-Year Accident History
The WWTP has had one accidental release of chlorine within the last five years. The
accidental release was caused by human error during maintenance of the old pressurized
feed system, and resulted in a release of less than one pound of chlorine and a worker seeking
medical evaluation. The accidental release did not result in an offsite impact.
Emergency Response Program
The WWTP is included within a written community emergency response plan, and the
primary responder to the WWTP is the City of Loveland Fire Department. WWTP employees
handle incidental releases of chlorine and are trained and equipped to do so.