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Destrehan Wastewater Treatment Plant

Parent Companies:
St. Charles Parish Council
EPA Facility ID:
100000147183
Other ID:
Facility DUNS:
0
Parent Company DUNS:
0

Location:

Address:
Johnathan Street
Destrehan, LA 70047
County:
ST. CHARLES
Lat / Long:
29.950, -90.349 (Get map)
Method:
GPS Carrier Phase Kinematic Relative Positioning Technique
Description:
Center of Facility
Horizonal accuracy:
m
Horizontal reference datum:
Source map scale:

Owner/Operator:

Name:
St. Charles Parish Council
Phone:
(504) 783-5100
Address:
P.O. Box 302
Hahnville, LA 70057
Foreign Address:

Person responsible for RMP implementation:

Name:
Richard P. Wright, P.E.
Title:
Director of Public Works/Wastewater
Email:

Emergency contact:

Name:
Richard P. Wright, P.E.
Title:
Director of Public Works/Wastewater
Phone:
(504) 783-5100
24-hour phone:
(504) 783-5100
Ext or PIN:
Email:

Other contacts:

Facility (or company) email:
Facility phone:
(504) 783-5100
Facility (or company) URL:

Safety:

Local Emergency Planning Committee:
St. Charles Parish LEPC
Full-Time Equivalent Employees:
2
Covered by OSHA PSM:
No
EPCRA section 302:
No
CAA Title Air Operating Permit:
No
CAA Permit ID#:
OSHA Star/Merit Ranking
No
Last Safety Inspection Date:
Nov. 24, 1998
Inspecting Agency:
State environmental agency
Using Predictive Filing:
No

Processes:

Chlorine
RMP ID:
19007
CBI claimed:
No
Program Level:
2
NAICS:
Sewage Treatment Facilities (22132)
Chemical name
CAS#
Quantity (lbs.)
CBI
Chlorine
7782-50-5
4,000
No
Public OCA Chemical
0
No

RMP Preparer:

Name:
Address:

,
Foreign Address:

Phone:

Latest RMP Submission:

Date:
June 25, 1999
Type:
First-time submission
Reason:
Registered:
Yes
RMP ID:
13920

Deregistration:

Date:
Effective Date:
Reason:
Other Reason:

2. Toxics: Worst-case

Some Risk Management Plan information is not provided in the available RMP data. You need to make an appointment at an EPA Reading Room In order to get access to details from the Off-Site Consequence Analysis (OCA) such as:

Instructions on how to make an EPA appointment can be found here.

Public OCA Chemical (in Chlorine)
CBI claimed:
No
Percent weight:
99.5
Physical state:
Gas liquified by pressure
Model used:
EPA's RMP Guidance for Waste Water Treatment Plants Reference Tables or Equations
Release duration (mins):
10.00
Wind speed (meters per sec):
1.5
Stability class:
F
Topography:
Urban
Passive mitigation
considered:
  • None
not considered:
  • Dikes
  • Enclosures
  • Berms
  • Drains
  • Sumps

3. Toxics: Alternative release

Some Risk Management Plan information is not provided in the available RMP data. You need to make an appointment at an EPA Reading Room In order to get access to details from the Off-Site Consequence Analysis (OCA) such as:

Instructions on how to make an EPA appointment can be found here.

Public OCA Chemical (in Chlorine)
CBI claimed:
No
Percent weight:
99.5
Physical state:
Gas liquified by pressure
Model used:
EPA's RMP Guidance for Waste Water Treatment Plants Reference Tables or Equations
Wind speed (meters per sec):
1.50
Stability class:
F
Topography:
Urban
Passive mitigation
considered:
  • None
not considered:
  • Dikes
  • Enclosures
  • Berms
  • Drains
  • Sumps
Active mitigation
considered:
not considered:
  • Sprinkler systems
  • Deluge systems
  • Water curtain
  • Neutralization
  • Excess flow valve
  • Flares
  • Scrubbers
  • Emergency shutdown

4. Flammables: Worst-case

None

5. Flammables: Alternative release

None

6. Five-year accident history

No Registered Accidents

7. Prevention: Program level 3

No Prevention Program level 3

8. Prevention Program level 2

Chlorine, Sewage Treatment Facilities (22132)
Prevention Program ID:
7684
Safety Review Date
Oct. 1, 1998, since latest RMP submission
PHA Update Date
, since latest RMP submission
Safety Regulations
  • None
Hazards Identified
  • Hurricanes
Process Controls
  • Manual Shutoffs
  • Grounding Equipment
Mitigation Systems
  • None
Monitoring Systems
  • None
Changes since PHA
  • Reduced Inventory
Training Type
  • None
Competency Testing
  • Written Test
  • Observation
Procedure Review Date
June 18, 1999, since latest RMP submission
Training Review Date
April 1, 1999, since latest RMP submission
Maintenance Review Date
June 16, 1999, since latest RMP submission
Maintenance Inspection Date
June 16, 1999, since latest RMP submission
Equipment Tested
Yes
Management of Change Most Recent Date
Management of Change Review Date
Pre-startup Review Date
Compliance Audit Date
Nov. 24, 1999
Compliance Audit Change Completion Date
July 30, 1999
Incident Investigation Date
None
Incident Invest. Change Completion Date
None
Participation Plan Review Date
Hot Work Review Date
Contractor Safety Review Date
, since latest RMP submission
Contractor Safety Eval. Date
, since latest RMP submission

9. Emergency response

Facility In Community Plan:
Yes
Facility Own Response Plan:
No
Specific Facility Response Plan:
No
Inform. Procedures in Response Plan:
No
Emergency Care in Response Plan:
No
Plan Review Date:
Response Training Date:
None
Local Response Agency:
Local Response Agency Phone:
(504) 783-5050
Subject To - OSHA EAP:
No
Subject To - OSHA HAZWOPER:
No
Subject To - CWA:
No
Subject To - RCRA:
No
Subject To - OPA:
No
Subject To - State EPCRA:
No
Subject To - Other:

Executive Summary

Executive Summary
St. Charles Parish Department of Wastewater

The St. Charles Parish Department of Wastewater operates a wastewater treatment plant near the Mississippi River in Destrehan, LA. Two (2) one ton chlorine cylinders are attached to the chlorine regulator system, and two (2) additional one ton chlorine cylinders are on site.

The Worst Case Scenario as specifically defined by the EPA is the full release of the regulated material in ten (10) minutes on a calm night with a failure of all safety measures. The largest tank used by St. Charles Parish Department of Wastewater at this site is a one ton cylinder. The potential consequences and end point were determined using RMP Comp. Under this worst case scenario, the chlorine would affect approximately 1.3 miles.

An alternate case scenario was developed for chlorine through a review of potential operation hazards. This alternate case scenario would be the failure of a chemical feed line that injects the material into the process. This scenario would result in the release of thirteen (13) pounds of chlorine. Again, the potential consequences and end point were determined using RMP Comp. Under typical weather conditions, the release would affect approximately 0.2 miles.

To minimize the risk of these events, procedures are in place to ensure the integrity of cylinders being delivered and stored on site. The written procedure to change cylinders has been distributed to all employees. Employees that change cylinders have been trained in the procedure. All operators are required to hold a Class IV Louisiana Wastewater Treatment Certification. During preparation for the certification examination, the hazards with chlorine are covered in the training manuals and discussed in the review classes.

In the event of a release with potential for off-site release, the chlorine emergency plan requires the operator to notify the Emergency Operations Center in St. Charles Parish. The Department of Emergency Prep
aredness will coordinate the necessary emergency response activities.

This wastewater treatment plant is scheduled for decommissioning by the end of 1999. At that time, no chlorine will be used or stored on site.