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City of McAllen North Wastewater Treatment Plant

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Facility #1 : City Of McAllen North Wastewat


Basic Facility Info facility_Basic_Facility_Info help link help link  
Facility ID100000057993
Deregistered (Yes/No)Yes
Facility NameCity of McAllen North Wastewater Treatment Plant
Street Address Line 12100 Sprague Road
CityMcAllen
StateTX
Zip Code78501
Zip Code Extension0220
CountyHidalgo County
113th Congressional DistrictTX15: Texas 15
Owner or Operator NameCity of McAllen
Latitude26.305278
Longitude-098.218889
Number of RMP Submissions5

Most Recent Submission Info facility_Most_Recent_Submission_Info help link help link  
RMP ID1000021736
Submission Typerevised submission for facility
Submission Date04/14/2011
Reason For Submission5-year update (40 CFR 68.190(b)(1))
Deregistration Date10/05/2012
Deregistration Effective Date01/06/2012
Deregistration ReasonSource no longer uses any regulated substance
Process Toxic Amount Total (lbs)24,000
Process Flammable Amount Total (lbs)0
Process Amount Total (lbs)24,000
Number of Potential Offsite Consequence Processes1
Potential Offsite Consequence Toxic Amount Total (lbs)24,000
Potential Offsite Consequence Flammable Amount Total (lbs)0
Potential Offsite Consequence Amount Total (lbs)24,000
All Process NAICS22132
Exec Summary Submission Date04/14/2011

Executive Summary facility_Executive_Summary help link help link (Facility #1 : City of McAllen North Wastewat, executive summary: all)

Executive Summary
INTRODUCTION
The United Sates Environmental Protection Agency (USEPA) finalized the Accidental Release Prevention Program (ARPP) under Section 112(r) of the 1990 Clean Air Act Amendments and subsequently finalized the Accidental Release Prevention Risk Management rule (40 CFR Part 68). This rule established the criteria of the Risk Management Plans (RMPs) required under the ARPP. 40 CFR Part 68 is similar to the Occupational Safety and Health Administration?s Process Safety Management Program, which is designed to protect workers from accidental releases of hazardous substances.
The Risk Management Program rule addresses over 100 chemical substances, 77 of which are acutely toxic and 63 of which are flammable gases, and the accidental release of these substances. The United States Environmental Protection Agency (USEPA) estimates that over 100,000 sources are covered by the rule, including chemical manufacturers and wholesalers, certain retailers, potable water treatment systems, wastewater treatment plants, ammonia refrigeration systems, and federal facilities.
The North Wastewater Treatment Plant (WWTP) falls under this regulation because of the onsite storage of chlorine and sulfur dioxide. The amount stored for both chemicals exceed the threshold limits specified by the USEPA, thereby making the facility subject to compliance with the regulation. The North WWTP personnel have complied with the USEPA Risk Management Program rule and have completed an Accidental Release Prevention Program (ARPP) Plan that contains the following required information:
* A management system (40 CFR Part 68 Subpart A);
* A hazard assessment that establishes the worst case and alternative release scenarios and their impact on the population and the environment (40 CFR Part 68 Subpart B);
* A prevention program that includes safety information, a hazard review, operating procedures, training, maintenance, compliance audits, and incident investigations. (40?CFR Part 68 Subpart C);
and
* An emergency response plan (40 CFR Part 68 Subpart E).
The following subsections discuss details of the plan that have been implemented at the North WWTP.
RELEASE PREVENTION AND EMERGENCY RESPONSE POLICIES
The North WWTP facility has an excellent record in preventing and minimizing release of chlorine and sulfur dioxide. The emergency response policies at this facility ensure that emergency response coverage is available 24 hours per day, 7 days per week. Adequate provisions have been implemented to coordinate response activities with outside agencies, such as the McAllen Fire Department in the event of an emergency. In the event of a release, plant staff will contact the McAllen Fire Department, who will in turn contact CRRT. CRRT will provide the City of McAllen with HAZMAT response. The plant staff has received training to enable an onsite staff response prior to the arrival of the City of McAllen HAZMAT RESPONDERS.

REGULATED SUBSTANCE
The North WWTP uses chlorine as a disinfectant in the wastewater treatment process. The North WWTP regularly has a maximum storage quantity of 12 one-ton containers of chlorine at its facility that is stored outside. This is above the threshold limit of 2,500?pounds set by the USEPA. In addition to the chlorine, the North WWTP uses sulfur dioxide to dechlorinate treated wastewater before discharge. The North WWTP regularly has a maximum storage quantity of 4 one-ton containers of sulfur dioxide at its facility that is stored outside. This is above the threshold limit of 5,000?pounds set by the USEPA.

PROCESS DESCRIPTION
The North WWTP is located at 2100 W. Sprague Road, in McAllen Texas. The wastewater is treated at the plant and after being disinfected using chlorine and dechlorinated using sulfur dioxide, is subsequently discharged back into the receiving stream.
The existing chlorine feed facility at the North WWTP consists of 6 one-ton chlorine containers, two vacuum regulators mounted to an automatic swit
chover module with gas piping and miscellaneous valves, four flow proportionate feed chlorinators, and gas piping and ejectors. A release of chlorine gas could potentially occur at the chlorine storage area or at the chlorine process area.
Chlorine is delivered to the North WWTP by truck and chlorine containers are stored in the outside storage area located to the north of the Chemical Building. Chlorine is removed as a pressurized gas, however; the majority of the chlorine feed is operated through an induced vacuum, which makes the system extremely safe and minimizes potential pressurized leaks along the feed lines.
The existing sulfur dioxide feed facility at the North WWTP consists of 1 one-ton sulfur dioxide containers on-line, two vacuum regulators mounted to an automatic switchover module with gas piping and miscellaneous valves, two flow proportionate feed sulfunators, and gas piping and ejectors. A release of sulfur dioxide could potentially occur at the sulfur dioxide storage area or the sulfur dioxide process area.
Sulfur dioxide is delivered to the North WWTP by truck, and stored in the outside storage area located to the northeast corner of the plant site. Sulfur dioxide is removed as a pressurized gas, however; the majority of the sulfur dioxide feed is operated through a water induced vacuum, which makes the system extremely safe and minimizes the potential for pressurized leaks along the feed lines.
WORST-CASE AND ALTERNATIVE RELEASE SCENARIOS
The storage and process areas for both sulfur dioxide and chlorine have associated hazards that can potentially affect onsite employees and the off site population and environment. The USEPA requires that a single worst case scenario for the facility and one alternative release scenario for each regulated chemical be reported.

Worst-Case Scenario
The worst-case release scenario is the one that creates the greatest dispersion of a regulated substance in any direction to an offsite endpoint. For the No
rth WWTP, chlorine poses the greatest risk. The largest potential release of chlorine would occur through a valve failure on one of the one ton cylinders located at the plant. This valve failure could potentially release all 2,000 pounds of the chlorine as a gas. Under Section 68.25(c)(1), the release time for a chemical such as chlorine under worst-case conditions is 10 minutes. Passive mitigation controls were not applicable to the worst-case release at this plant.

The USEPA-approved modeling program DEGADIS+ was used to characterize the effects of the worst case scenario at the North WWTP facility. The distance to the toxic endpoint of 3?ppm was determined to be 1.66 miles. Commercial, industrial, and residential areas would be affected in the worst-case release scenario. The estimated affected residential population is 10300 people.

The worst-case release scenario is the one that creates the greatest dispersion of a regulated substance in any direction to an offsite endpoint. The largest potential release of sulfur dioxide would occur through a valve failure on a one-ton container located at the plant. This valve failure could potentially release all 2,000 pounds of the sulfur dioxide as a gas. Under Section 68.25(c)(1), the release time for a chemical such as sulfur dioxide is 10 minutes. Passive mitigation controls were not applicable to the worst-case release scenario at this plant.

The EPA-approved modeling program DEGADIS+ was used to characterize the effects of the worst-case sulfur dioxide release scenario at the North WWTP. The distance to the toxic endpoint of 3 ppm was determined to be 1.61 miles. The affected residential population is estimated to be 7,700 people. Commercial, industrial and residential areas would be affected in the worst-case release scenario.

Alternative Release Scenarios
One alternative scenario for chlorine was modeled for the North WWTP. The release was established as a leak that would potentially develop in the p
acking at the chlorine container valve. A release of chlorine through the 0.2-inch diameter hole in the valve packing is presumed to occur for approximately 10 minutes, before being observed or detected, and repaired. The release rate of chlorine caused by leakage through this opening is calculated to be 73.7 pounds per minute. DEGADIS+ was also used to characterize the effects of the alternative case scenario at the North WWTP. The distance to the USEPA defined toxic endpoint of 3 ppm was determined to be 1.33 miles. The estimated affected residential population is 6,600 people.

One alternative scenario for sulfur dioxide was modeled for the North WWTP. The release was established as a leak that would potentially develop in the packing at the sulfur dioxide container valve. A release of sulfur dioxide through the 0.2-inch diameter hole in the valve packing is presumed to occur for approximately 10 minutes, before being observed or detected, and repaired. The release rate of sulfur dioxide caused by leakage through this opening is calculated to be 73.3 pounds per minute. DEGADIS+ was also used to characterize the effects of the alternative case scenario at the North WWTP. The distance to the USEPA defined toxic endpoint of 3 ppm was determined to be 1.39 miles. The estimated affected residential population is 7700 people.

GENERAL ACCIDENTAL RELEASE PREVENTION PROGRAM
The North WWTP carries out consistent operation and maintenance of its chlorine and sulfur dioxide equipment utilizing only fully trained personnel in this area. North WWTP management ensures consistent operation through disciplinary actions for operational deviations.

FIVE-YEAR ACCIDENT HISTORY
The accident history for the North WWTP was reviewed for the period from April 2006 through April 2011. During this period of time, no accidental releases of chlorine or sulfur dioxide had occurred.

EMERGENCY RESPONSE PROGRAM
As mentioned earlier, this facility has developed an Emergency Resp
onse Program in which plant employees are divided into various management and response teams. Back-up personnel have been designated in the event that employees designated are unavailable.

The Emergency Response Plan includes: (1) procedures to follow in the event of a chlorine or sulfur dioxide emergency, (2) information about the frequency of employee emergency response training, and (3) a detailed description of the emergency response training underway.

The McAllen Fire Department has been designated to provide emergency responders and equipment to CRRT, who has been contracted to provide HAZMAT response. CRRC will assume Incident Command upon arriving at the plant.

PLANNED CHANGES TO IMPROVE SAFETY
Based on the hazard review and prevention evaluation completed for chlorine and sulfur dioxide, a list of action items was developed and is being considered by North WWTP management to determine if implementation is to be accomplished. The most notable planned changes include the following:

* Ensure that the delivery driver follows a set procedure in the delivery of chlorine or sulfur dioxide. MW will coordinate with the staff to develop a procedure to govern the activities of the driver or vendor while on plant grounds. It is anticipated that the vendor can then be subjected to this procedure at the time of the plant?s next bid for chemical purchase. However, the existing vendor will likely accept these requirements voluntarily to ensure customer satisfaction;

* Provide backup power for the plant systems in case of a power outage; and

* In the future when the plant facilities are expanded or upgraded, consideration will be given to design and construction of containment buildings to encompass the chlorine cylinders and the sulfur dioxide containers designed in conjunction with the capability to chemically neutralize any accidental releases. This option might be compared with the conversion to a nongaseous chlorine or sulfur dioxide compound.
EXECUTI
VE SUMMARY

MONTGOMERY WATSON
CITY OF MCALLEN ACCIDENTAL RELEASE PREVENTION PROGRAM
NORTH WASTEWATER TREATMENT PLANT ES-5

EXECUTIVE SUMMARY

MONTGOMERY WATSON
CITY OF MCALLEN ACCIDENTAL RELEASE PREVENTION PROGRAM
NORTH WASTEWATER TREATMENT PLANT ES-1


Submission - Other Facility Info facility_Submission_-_Other_Facility_Info help link help link  
Number of Full Time Employees16
Owner or Operator NameCity of McAllen
Owner or Operator Address Line 1P O BOX 220
Owner or Operator CityMcAllen
Owner or Operator StateTX
Owner or Operator Zip78501
Owner or Operator Zip Extension0220
Parent Dun and Bradstreet Number0
Second Parent Dun and Bradstreet Number0
Number of Full Time Employees16
Number of FTE CBI FlagNo
Covered by OSHA PSM StandardNo
Covered by EPCRA Section 302Yes
Covered by CAA Title VNo
Last Safety Inspection Date04/08/2011
Last Safety Inspection ByFire Department
OSHA Star or Merit RankingNo
LEPC NameHidalgo County LEPC

Submission - Contact Info facility_Submission_-_Contact_Info help link help link (Facility #1 : City of McAllen North Wastewat, RMP submission #1 : 2011-04-14)
Owner or Operator Phone9566811630
Facility URLwww.mcallen.net
Facility Phone9563806858
Facility Dun and Bradstreet Number0
RMP ContactRoel Rodriguez, P. E.
RMP Contact TitleGeneral Manager
RMP Contact Emailroel_rodriguez@mcallen.net

Submission - Additional Info facility_Submission_-_Additional_Info help link help link  
RMP Complete FlagYes
Predictive FilingNo
No RMP Accidents Last 5 YearsNo
Complete Check Date04/14/2011
Postmark Date04/14/2011
Anniversary Date04/14/2016
Confidential Business InformationNo

Submission - Lat/Long Info facility_Submission_-_Lat_Long_Info help link help link  
Latitude26.305278
Longitude-098.218889
Valid Lat/LongYes
Lat/Long MethodInterpolation - Photo
Lat/Long Location TypeProcess Unit
FRS Latitude26.3
FRS Longitude-98.21
FRS Lat/Long DescriptionFACILITY CENTROID
FRS Lat/Long MethodINTERPOLATION-MAP

Submission - Counts and Totals facility_Submission_-_Counts_and_Totals help link help link (Facility #1 : City of McAllen North Wastewat, RMP submission #1 : 2011-04-14)
Number of RMP Accidents0
RMP Accident Flammable Total (lbs)0
RMP Accident Toxic Total (lbs)0
RMP Accident Amount Total (lbs)0
Number of RMP Accidents0
Number of Processes1
Number of Process Chemicals0
Number of Toxic Worst-case Scenarios1
Number of Toxic Alternate Case Scenarios1
Number of Flammable Worst-case Scenarios0
Number of Flammable Alternate Case Scenarios0
RMP Accident Flammable Total (lbs)0
RMP Accident Toxic Total (lbs)0
RMP Accident Amount Total (lbs)0
Total RMP Accident Deaths0
Total RMP Accident Injuries0
Total RMP Accident Evacuated/Sheltering In Place0
Total RMP Accident Property Damage$0

Processes facility_Processes help link help link (Facility #1 : City of McAllen North Wastewat, RMP submission #1 : 2011-04-14, process #1 : Wastewater Treatment)
Process DescriptionWastewater Treatment
Program Level2
Confidential Business InformationNo
Toxic Amount Total (lbs)24,000
Flammable Amount Total (lbs)0
Process Amount Total (lbs)24,000
Number of Process Chemicals0
Number of Toxic Worst-Case Scenarios1
Number of Toxic Alternate Scenarios1
Number of Flammable Worst-Case Scenarios0
Number of Flammable Alternate Scenarios0

Process Chemicals facility_Process_Chemicals help link help link  
Process Chemical IDChlorine
CAS number007782505
Chemical TypeToxic
Process Chemical Amount (lbs)24,000
Confidential Business InformationNo

Process Chemicals facility_Process_Chemicals help link help link (Facility #1 : City of McAllen North Wastewat, RMP submission #1 : 2011-04-14, process #1 : Wastewater Treatment, process chemical #2)
Process Chemical IDPublic OCA Chemical
CAS number000000000
Process Chemical Amount (lbs)0
Confidential Business InformationNo

Worst-Case Toxic Scenarios facility_Worst-Case_Toxic_Scenarios help link help link  
Physical StateGas
Model UsedAreal Locations of Hazardous Atmospheres [ALOHA(R)]
Release Duration (minutes)10
Wind Speed (meters/sec)1.5
Atmospheric Stability ClassF
TopographyUrban
Passive Mitigation - DikesNo
Passive Mitigation - EnclosuresNo
Passive Mitigation - BermsNo
Passive Mitigation - DrainsNo
Passive Mitigation - SumpsNo
Confidential Business InformationNo

Alternate Case Toxic Scenarios facility_Alternate_Case_Toxic_Scenarios help link help link (Facility #1 : City of McAllen North Wastewat, RMP submission #1 : 2011-04-14, process #1 : Wastewater Treatment, process chemical #2, alternate toxic scenario #1)
Physical StateGas
Model UsedAreal Locations of Hazardous Atmospheres [ALOHA(R)]
Wind Speed3
Atmospheric Stability ClassD
TopographyUrban
Passive Mitigation - DikesNo
Passive Mitigation - EnclosuresNo
Passive Mitigation - BermsNo
Passive Mitigation - DrainsNo
Passive Mitigation - SumpsNo
Active Mitigation - SprinklersNo
Active Mitigation - Deluge SystemsNo
Active Mitigation - Water CurtainNo
Active Mitigation - NeutralizationNo
Active Mitigation - Excess Flow ValvesNo
Active Mitigation - FlaresNo
Active Mitigation - ScrubbersNo
Active Mitigation - Emergency ShutdownNo
Active Mitigation - OtherChlorine leak detectors, SCBA's on site, Level A Suites
Confidential Business InformationNo

Process NAICS facility_Process_NAICS help link help link (Facility #1 : City of McAllen North Wastewat, RMP submission #1 : 2011-04-14, process #1 : Wastewater Treatment, process NAICS code #1 : 22132)
NAICS Code22132: Sewage Treatment Facilities

Prevention Program 2 facility_Prevention_Program_2 help link help link  
Safety Info Review Date04/29/1999
Safety Regs - NFPA 58No
Safety Regs - OSHA (Ammonia)No
Safety Regs - ASTM StandardsNo
Safety Regs - ANSI StandardsNo
Safety Regs - ASME StandardsNo
Safety Regs - NoneNo
Safety Regs - OtherSARA Title III
PHA Review Date04/12/2011
Hazard Identified - Toxic ReleaseNo
Hazard Identified - FireNo
Hazard Identified - ExplosionNo
Hazard Identified - Runaway ReactionNo
Hazard Identified - PolymerizationNo
Hazard Identified - OverpressureNo
Hazard Identified - CorrosionNo
Hazard Identified - OverfillingNo
Hazard Identified - ContaminationNo
Hazard Identified - Equipment FailureNo
Hazard Identified - Cooling LossNo
Hazard Identified - EarthquakeNo
Hazard Identified - FloodNo
Hazard Identified - TornadoNo
Hazard Identified - HurricaneNo
Hazard Identified - OtherRefine SOP and leak detection system
Process Controls - VentsNo
Process Controls - Relief ValvesNo
Process Controls - Check ValvesNo
Process Controls - ScrubbersNo
Process Controls - FlaresNo
Process Controls - Manual ShutoffsNo
Process Controls - Auto ShutoffsNo
Process Controls - InterlocksNo
Process Controls - AlarmsYes
Process Controls - Keyed BypassNo
Process Controls - Emergency AirNo
Process Controls - Emergency PowerNo
Process Controls - Backup PumpNo
Process Controls - GroundingNo
Process Controls - Inhibitor AdditionNo
Process Controls - Rupture DisksNo
Process Controls - Excess Flow DevicesNo
Process Controls - Quench SystemNo
Process Controls - Purge SystemNo
Process Controls - NoneNo
Mitigation Systems - SprinklersNo
Mitigation Systems - DikesNo
Mitigation Systems - Fire WallsNo
Mitigation Systems - Blast WallsNo
Mitigation Systems - Deluge SystemsNo
Mitigation Systems - Water CurtainsNo
Mitigation Systems - EnclosureNo
Mitigation Systems - NeutralizationNo
Mitigation Systems - NoneNo
Mitigation Systems - Otherfrequent inspection 24/7 per week by plant personnel - aggressive preventive maintenance program for chlorine equipment, also have installed chemical leak detectors.
Monitoring Systems - Process AreaYes
Monitoring Systems - PerimeterNo
Monitoring Systems - NoneNo
Changes Since PHA - Reduced InventoryNo
Changes Since PHA - Increased InventoryNo
Changes Since PHA - Process ParametersNo
Changes Since PHA - Process ControlsNo
Changes Since PHA - Process DetectionYes
Changes Since PHA - Perimeter MonitoringNo
Changes Since PHA - Mitigation SystemsNo
Changes Since PHA - None RecommendedNo
Changes Since PHA - NoneNo
Procedure Review Date04/12/2011
Training Review Date04/13/2011
Type of Training - ClassroomYes
Type of Training - On the JobNo
Type of Training - OtherMock drills (hands on)
Competency Testing - Written TestsYes
Competency Testing - Oral TestsYes
Competency Testing - DemonstrationNo
Competency Testing - ObservationNo
Maintenance Review Date04/06/2011
Maintenance Inspection Date04/04/2011
Equipment TestedChlorine vacuum injectos
Compliance Audit Date04/14/2011
Compliance Audit Change Completion Date04/14/2011
Confidential Business InformationNo

Prevention Program 2 Chemicals facility_Prevention_Program_2_Chemicals help link help link (Facility #1 : City of McAllen North Wastewat, RMP submission #1 : 2011-04-14, process #1 : Wastewater Treatment, process NAICS code #1 : 22132, prev. program 2 #1, prev. program 2 chemical: all)
Process Chemical Record ID
1000031384

Prevention Program 2 Text facility_Prevention_Program_2_Text help link help link  
Prevention Program Description
The North WWTP facility has an excellent record in preventing and minimizing releases of chlorine. The emergency response policies at this facility ensure that emergency response coverage is available 24 hours per day, 7 days per week. Adequate provisions have been implemented to coordinate response activities with outside agencies, such as the McAllen Fire Department, in the event of an emergency. In the event of a release, plant staff will contact the McAllen Fire Department, who will in turn contact CRRC. CRRC will provide the City of McAllen with HAZMAT response. The plant staff has received training to enable an onsite staff response prior to the arrival of the City of McAllen HAZMAT RESPONDERS.

Emergency Response Plan Info facility_Emergency_Response_Plan_Info help link help link  
Facility In Community PlanYes
Facility Own Response PlanYes
Specific Facility Response PlanYes
Inform. Procedures in Response PlanYes
Emergency Care in Response PlanYes
Plan Review Date07/15/2005
Response Training Date04/13/2011
Local Response AgencyMcAllen Fire Department
Local Response Agency Phone9566812500
Subject To - OSHA EAPNo
Subject To - OSHA HAZWOPERYes
Subject To - CWAYes
Subject To - RCRANo
Subject To - OPANo
Subject To - State EPCRANo
Subject To - Other40 CFR Part 68


Search Criteria Used
RMP Facility ID100000057993

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