HDMSP00036449 Page 1 PROCESS HAZARD ANALYSIS FOR THE SEPTIC TANKS AND SYSTEMS REMOVALS AT BUILDING 4005, 4009 AND 4100. Introduction As part of the Area IV Remediation Project, the septic tanks and piping systems at buildings 4005, 4009 and 4100 will be removed. The septic tank holes will be filled and the areas will be returned to natural terrain. The requirements and guidelines for performing a Process Hazard Analysis (PHA) are provided in EID-06146, Process Hazards Analysis for Closure of ETEC. The purpose of this analysis is to identify personnel hazards, determine their potential impacts, and to insure reasonable measures have been implemented to eliminate, control, or mitigate the hazards. The analysis is limited to those operations that involve hazards that are not routinely encountered and accepted in the course of everyday living and working by the vast majority of the public. Safety Review and Hazard Analysis Previous incident reports were reviewed to determine likely potential hazards. Potential engineering and administrative controls were discussed for each hazard identified to determine their applicability for this project. Once the hazards were identified, the probability of each occurring and the associated consequences were rated. TABLE A-1 was used to determine a risk level for each hazard by using criteria in TABLE's A-2 and A-3. The results are tabulated in TABLE A-4. As shown in TABLE A- 4, the highest level of risk was determined to be Level III for five hazards. The tasks required for these projects will be performed by Rocketdyne personnel. This report is written to satisfy requirements of Level III hazards. The potential hazards will be discussed during daily tailgate meets, when applicable, and documented in the contractor daily reports. Hazards Summary : 1. Chemical Energy: Methane gas accumulation in the septic tank area is a possibility. The tanks will be purged with air prior to the start of work if required. The tops of the tanks will be removed to reduce the presence of methane gas. In addition the workers will be instructed not to enter the tanks. These steps will mitigate the methane gas hazard. 2. Electrical Energy : There is a possibility of underground electrical conduits and other utilities being in the tank areas. To mitigate these hazards "Dig Alert" will be engaged to locate any underground utilities. "Ogden" will also be utilized to provide an underground survey of the tank areas. The area will be surveyed for overhead electrical lines.
HDMSP00036450 Page 2 3. Human Capability : The PIG will check the equipment operation certifications and the safety records of all personnel operating heavy equipment needed to remove the tanks. 4. Human Hazards : Some trenching around the tanks will be required. To mitigate hazards associated with trenches, the sides of the trenches will be shored up as required or the sides of the trenches will be stepped. Protection ropes and signs will be installed around the edges of the trenches. 5. Kinetic Energy: The greatest hazard is thought to be the failure of a back-hoe arm. In order to mitigate this hazard all components of back-hoes used will be inspected at the beginning of each shift. Inspection results will be entered onto the daily equipment check form. 6. Material Deformation : The concrete used in tank construction may have aged to the point where it will crack and break when lifting pressure is applied to the tank. To mitigate this hazard all personnel will be removed from the tank area while lifting. The height that the tank may be lifted will be limited and personnel will be required to wear proper PPE. Personnel will also be reminded of this hazard in the daily safety meetings. 7. Mechanical Energy : Rigging equipment failure could cause personnel injury. Prior to any lifting activities the PIC will verify that all rigging equipment has current load test tags and that the equipment is not damaged. 8. Natural Environment : Working in severe wind and storm conditions may pose hazards to personnel. Work will be performed in good weather only. 9. Pressure : Fire hoses containing high pressure water will be utilized for dust suppression. Personnel injury might occur if a hose whips and strikes a worker. This risk is mitigated by having the PIC check the hose connections and condition prior to use. The PIC shall also discuss the proper use of high pressure fire system equipment in daily safety meetings. 10. Radiation Ionizing : The PIC will require that a Health Physicist be on-site at all times when work is in progress. The HP will take samples and run surveys to determine the presence of any materials which would expose workers to ionizing radiation. 11. Radioactivity : There is a small possibility that surfaces of the tank and piping may have radioactive contamination. An HP will be assigned to be on-site at all times when work is in progress. The HP will check for component surface contamination, on-site soil contamination, surface groundwater contamination, and airborne dust contamination. 12. Toxicants : Hepatitis blood system damage and poison oak exposure are low level possibilities. These hazards will be mitigated by assuring that all personnel have taken the blood borne pathogen class (4088), have obtained the Hepatitis virus
HDMSP00036451 Page 3 shots, are wearing proper PPE while cu tting weeds, and that they are made aware of the hazards in the daily safety meetings.
HDMSP00036452 Page 4 CONSEQUENCE : Rating: Level : 4 High 3 Medium 2 Lo w 1 Extremely Low Low 4 legl'lglble 3 Negligibl e 2 Negligible 1 Moderate High High 8 12 1 6 Low Moderate High 6 12 Low Lov,, Moderate 4 IR 61-13 m egilgiibie legilglbia Low 2 3 4 PROBABILITY : Level: Extremely Low Low Medium Hig h Rating: 1 2 3 4 Review Levels: Level I - Level 11 - Level III - TABLE A-1. RISK MATRIX Probability Category Descriptio n Ratin g 1 Extremely Probability of occurrence is extremely unlikely or the event is not expecte d Low to occur during the life of the process, product, facility or operation. Events are limiting faults considered in design (design basis accidents). 2 Low Probability of occurrence is unlikely during the life of the facility o r operation. 3 Medium Event may occur during the process, product, facility or operation lifetime. 4 High Event is likely to occur several times during the process, product, facilit y or operation lifetime. TABLE A -2. PROBABILITY RATING LEVEL S Consequence Category Descriptio n Ratin g 4 High Serious impact on-site or off-site. May cause deaths or property loss i n excess of $500,000. Major impact on the environment. 3 Medium Major impact on-site or minor impact off-site. May cause severe injury o r severe occupational illness to personnel or property damage in excess of $100,000 or significant impact on the environment. 2 Low Minor on-site with no off-site impact. May cause minor injury or mino r occupational illness or minor impact on the environment. 1 Extremely Will not result in injury or occupational illness or provide an impact on th e Low environment. TABLE A -3. CONSEQUENCE RATING LEVEL
Page 5 REMOVAL OF SEPTIC TANKS AND SYSTEMS AT BLDGS. 4005, 4009 AND 4100 Potential Hazard Protection Potential Effects Probability Consequence Risk Rating Ratin g Describe Hazard List Engineering & Administrative actions and List Consequences of Hazard Qualitative Qualitative From Table controls, including PPE, used to mitigate the Occurrence Assessment Assessment B- 1 hazard from Table B-2 from Table B-3 1. Chemical-methane toxic gas Purge tank with air prior to start of work if Toxic gas production, sewer Extremely Low Low (2) Negligible required. gas (1) (2) Cut top of tank and remove, do not sen d personnel into tank. Check for potential material deposits fro m Buildin 4009. 2. Electrical Possibility of cables Dig Alert check for underground lines. Electrocution, personnel Extremely Low Extremely Low Negligibl e in area burns, ignition of (1) (1) (1 ) combustibles Ogden provide underground survey. Check for overheat electrical overheat lines. 3. Human Capability PIC check qualifications, certifications, Injury to personnel and Low (2) Low (2) Low (4 ) and safety records of employees equipment (Level III ) assi ned. 4. Human Hazards Shore up sides of trenches as required. Personnel injury, Low (2) Low (2) Low (4 ) Excavation depth, unguarded Install protection ropes and signs. (Level III) openings Step sides of trenches as required. 5. Kinetic Energy Inspect all components of back-hoe at Failure of back-hoe arm Low (2) Low (2) Low (4) beginning of each shift. Daily check form. (Level 111 ) 6. Material All personnel removed from tank area Age of cement tank could Medium (3) Extremely Low Negligible Deformation while lifting - this requirement in cause cracking and breakage (1) (3) instructions and Daily Safety Meetings. while lifting, structural failure. Limit height of lift. Personnel wear PPE. 7. Mechanical energy Prior to lifting assure all rigging equipment Rigging equipment failure Extremely Low Low (2) Negligible is the proper equipment for the job and could cause personal injury (1) (2 ) that current proof testing, has been done. 8. Natural environment Perform work on good weather days Wind and storm, lightening Extremely Low Extremely Low Negligible (1) (1) 1
. Page 6. Potential Hazard Protection Potential Effects Probability Consequence Risk Rating Rating Describe Hazard List Engineering & Administrative actions and List Consequences of Hazard Qualitative Qualitative From Table controls, including PPE, used to mitigate the Occurrence Assessment Assessment B- 1 hazard from Table B-2 from Table B-3 9. Pressure PIC assure good condition of fire hose Fire hose whipping Low (2) Low (2) Low (4 ) and proper connection of equipment prior (Level III ) to use. During daily Safety Meeting, make cre w aware of a potential hydraulic failure on the back-hoe and the required actions i n the event of hydraulic failure. 10. Radiation ionizing PIC require HP surveys and samples. Worker exposure to Alpha or Extremely Low Extremely Low Negligible HP on-site at all times. Beta, ionizing radiation (1) (1) (1 ) 11. Radioactivity HP survey and sample tank surface. 1. Surface of tank and Extremely Low Extremely Low Negligible piping contaminatio n (1) (1) (1 ) HP survey and sample dirt, airborne 2. On-site coil contamination products, water. 3. On-site dust airborne 4. On-site surface an d groundwate r 12. Toxicants Assure all personnel have taken blood 1. Hepatitis blood system Low (2) Low (2) Low (4 ) borne pathogen class (4088). damage (Level III) Assure all personnel have been given the 2. Poison oa k opportunity for Hepatitis B virus shots. Wear Pro er PPE while cutting weeds. Attachments : 1. Incident Database by SHEA. 2. Incident Report chart by SHEA. TABLE A-4. RISK ASSESSMENT CATEGORY SUMMAR Y
HDMSP00036455 Page 7 Incident Reports 40 1999 131Q 2000 02Q2000 M30 200 0 Hearing Equipment Damaged Ladderso Warnings & Alarms Fire/Security PPE, Confined Space 3 Personal Medical Hardware/IDCRo Other F-1211 High Pressure Systems NZ E1717- Emergency Resp/Egress Test Shut Dow n Machine / Eqpt Malfunctio n Procedures Not Followed 9-6 Pedestrian/Driving Electrical Issues, LOTO Falls, Trips, Slips Contractor Issues 11 Environmental Issues -, r ; s 2 7 Material Handling 2 1 23 0 10 20 30 40 50 60 70 80 90 10 0