Mt. Carmel Water Treatment Plant - Executive Summary

| Accident History | Chemicals | Emergency Response | Registration | Source | Executive Summary |

We have adopted this Program in order to implement 40 C.F.R. 68, the federal requirements regulating Risk Management of Highly Hazardous Chemicals. 
This Program will help prevent the occurrence of, or minimize the consequences of, catastrophic releases by stating our policies and procedures for the management of process hazards in start-up, operation, inspection, maintenance and the other matters addressed in the federal standard. 
Our Program calls for maximum employee participation and includes all elements of the employee participation provisions of the standard.  We shall, as a minimum: (1) consult with employees and their representatives on the conduct and development of the process hazard review and other elements of the risk management plan, and (2) provide to our employees and their representatives access to the process hazard review and all other information required to be developed under that standard. 
Accidental Release Prevention and Emergency Response  
The City of Waco believes that preventative maintenance is the key to minimizing the potential for accidental releases.  Standard Operating Procedures (SOPs) have been reviewed and revised to enable the employees to perform their work in a safe and efficient manner. 
The City of Waco has taken steps to educate and inform the operators, supervisors, and maintenance crews in the appropriate response to an accidental release.  The training includes classroom training and operating procedures on the proper response to emergency situations.  
Stationary Source and Regulated Substances 
The Mt. Carmel Water Treatment Plant utilizes chlorine and anhydrous ammonia for disinfection of the treated water.  The maximum inventory and threshold quantities for these chemicals are shown below.   All chlorine containers and the anhydrous ammonia are stored and utilized in separate areas.  The chlorine is stored in a building, which will act as passive mitigation in the event of a release.  Th 
e anhydrous ammonia is stored outside in a tank. 
Chemical                              Maximum Inventory (lb)           Threshold Quantity (lb) 
Chlorine                                          24,000                                      2,500 
Anhydrous Ammonia                     30,637                                    10,000 
Offsite Consequence Analysis 
The offsite consequence analysis includes a worst-case release scenario and an alternative release scenario as defined in 40 C.F.R. 68.  RMP*Comp was used to determine endpoint distances for both scenarios.  The model's input parameters are summarized in the table below. 
                                                              RMP*Comp Input Parameters 
                                                 Worst-Case Scenario               Alternative Scenario 
Windspeed (m/s)                                   1.5                                                 3 
Atmospheric Stability Class                     F                
Temperature (0 F)                                  77                                                 77 
Humidity (%)                                          50                                                 50 
Height of Release (m)                             0                                                  1 
Topography                                        Urban                                          Urban 
                                                        Chlorine                                      Ammonia 
End Points (mg/l)                                0.0087                                            0.14 
The results of the air dispersion model are summarized in the table below along with the estimated population within the impact area. The population data was estimated using the Block Uniform Density Group Method in Landview III, which uses the 1990 U. S. Census data to estimate population.  The public and environmental recept 
ors are listed in Section 8 of this plan. 
                                                                                        RMP*Comp Output Results 
                                                                          Worst-Case Scenario              Alternative Scenario 
                                                                      Chlorine         Ammonia              Chlorine       Ammonia 
Impact Radius (miles)                                       1.3                     2                         0.1                  0.1 
Estimated Population with Impact Area         3,100               11,000                     56                   56 
Accidental Release Prevention Program 
The City of Waco has implemented a General Accidental Release Prevention Program to minimize releases.  This Program includes: safety information on the covered chemicals, hazard reviews, operating and maintenance procedures, training, compliance audits, incident investigations, and emerge 
ncy response procedures. 
Five-year Accident History 
In the last 5 years, there have not been any accidental releases from the covered process that resulted in deaths, injuries, or significant property damage on site, or known offsite deaths, injuries, evacuations, sheltering-in-place, property damage, or environmental damage. 
Planned Changes to Improve Safety 
The City of Waco has implemented a Risk Management Plan (RMP) that meets or exceeds the requirements of 40 CFR 68.  It is Waco's philosophy to continually improve the safe working conditions of its employees to minimize accidents and reduce the potential for either an on-site or off-site release.  With this in mind, Waco is planning on incorporating many of the RMP elements into other areas of the process not covered under 40 CFR 68 to improve the overall safety of the plant.
Click to return to beginning