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H2S Exposure Guidelines ATSDR Guidelines OSHA Regula,ons Center for Disease Control Community non-­‐regulatory guidelines Enforceable workplace regula,ons OSHA – OccupaConal Safety and Health AdministraCon •  0.010 ppm odor threshold •  0.020 ppm for Intermediate Exposure (15 – 365 days) •  0.070 ppm for Acute Exposure (1 – 14 days) ATSDR – Agency for Toxic Substances and Disease Registry Backup Item # 6 C/W: 11-­‐13-­‐2014 •  20 ppm ceiling •  50 ppm peak – 10 minute exposure allowed only once if no other measureable exposure occurs OSHA Exposure Level DefiniCons •  Time Weighted Average (TWA) – 8 hours per day 40 hours per week •  Short Term Exposure Limit (STEL) – 15 minute TWA which should not be exceeded more than 4 Cmes per day with 60 minutes between exposures •  Ceiling (C) – Should not be exceeded during any part of the working day •  Peak – A one Cme spike if no other exposure occurs What do the readings mean? 0.010 ppm 0.020 ppm 0.070 ppm .590 ppm
10 ppm 20 ppm 50 ppm 50-­‐100 ppm
100 ppm 500–700 ppm >700 ppm Odor threshold
Intermediate Exposure (15 – 365 days); slight effect in vulnerable people
Acute Exposure (1–14 days); slight effect in vulnerable people
Highest recorded value at Wedgewood Community Center (Aug – Oct)
Eye irritaCon Ceiling
Peak -­‐ 10 minute exposure allowed only once if no other measureable exposure occurs
Respiratory irritaCon
Coughing, loss of sense of smell
Loss of consciousness and death in 30-­‐60 minutes
Rapid unconsciousness, cessaCon of breathing and death Con,nuous H2S Monitoring •  2,725 Air Samples Analyzed in September & October •  On 28 % of Days One or More Samples Exceeded ASTDR MRL for Acute Exposure •  On 58% of Days One or More Samples Exceeded ASTDR MRL for Intermediate Exposure 6pm – 6am •  95% of All Samples Exceeding ASTDR MRL for Acute Exposure •  85% of All Samples Exceeding ASTDR MRL for Intermediate Exposure •  68% of All Samples Exceeding OSHA Minimum Odor DetecCon Level •  Highest Recorded Value 0.590 ppm H2S ConcentraCon (September – October) SW-­‐SE Winds •  76% of All Exceedances of ASTDR MRL for Acute Exposure •  75% of All Exceedances of ASTDR MRL for Intermediate Exposure •  73% of All Exceedances of OSHA Minimum Odor DetecCon Level Wind DirecCon (September – October) Wind Data from Pensacola InternaConal Airport (KPNS) •  Only 24% of Hourly Wind ObservaCons from SW-­‐SE •  76% of Hourly Wind ObservaCons from other DirecCons 
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