Application for the Reassessment of a Hazardous Substance under ...

Conclusions on re-entry worker exposure estimates and risk assessment5.81 Only a few scenarios for existing uses of dichlorvos gave acceptable risks for reentryworkers, and acceptable re-entry generally requires the use of PPE and/orRPE plus in some cases a Restricted Entry Interval (REI) is also needed.5.82 Re-entry into cereals treated at 0.8kg a.s./ha (Scenarios (3b)(4b)(Table XII) forscouting and similar activities are acceptable provided PPE (hood/visor + overallsover long-sleeved shirt and long-legged trousers + boots + gloves) and RPE (atleast a half-face respirator) are worn. All other outdoor uses (Scenarios 1 & 2,strawberries; Scenarios 3a,c & 4a,c, vegetables & berries; Scenarios 5 & 6, fruit(tamarillo/ persimmons/ berry); Scenarios 7 & 8, passionfruit) were associatedwith unacceptable re-entry risks even with the use of the highest PPE/RPEoptions.5.83 Re-entry for ventilation into glasshouses in crop production (Scenarios 9 - 12)treated at 50 mg/m 3 would be acceptable 4 hours after application, if exposure waslimited to 30 minutes, and with the use of PPE (hood/visor + overalls over longsleevedshirt and long-legged trousers + boots + gloves) and RPE (full-face or airhose).5.84 Re-entry for other tasks (tending/harvesting crops) of glasshouses in cropproduction (Scenarios 9 - 12) treated at 50 mg/m 3 would be acceptable if a REI of4 hours after the onset of ventilation (i.e. at least 8 hours after application) wasapplied, and if exposure was limited to only 2 hours per day with the use of PPE(hat + goggles + overalls over long-sleeved shirt and long-legged trousers + boots+ gloves). [Note the REI (like the others proposed) attempts to allow foruncertainties to account for the characteristics of different buildings (e.g.construction materials & venting behaviour).]5.85 Re-entry for ventilation into glasshouses or similar facilities used for Cymbidiumproduction treated at 1300 or 1800g a.i./ha (52 or 72 mg/m 3 ; Scenarios 13-16)would be acceptable 4 hours after application if exposure was limited to 30minutes, and PPE (hood/visor + overalls over long-sleeved shirt and long-leggedtrousers + boots + gloves) and RPE (full-face or air-hose) were used.5.86 Re-entry for other tasks (tending/harvesting) in glasshouses or similar facilitiesused for Cymbidium production treated at the lower use rate (1300g a.i./ha or 52mg/m 3 ; Scenarios 13 & 14) would be acceptable if a REI of 4 hours after theonset of ventilation (i.e. at least 8 hours after application) was applied, and ifexposure was limited to only 1 hour per day with the use of PPE (hat + goggles +overalls over long-sleeved shirt and long-legged trousers + boots + gloves).5.87 Re-entry to mushroom houses (Scenarios 9-12) for any purpose would beacceptable if a REI of 48 hours after treatment applied, and if exposure waslimited to only 2 hours per day with the use of PPE (hat + goggles + overalls overlong-sleeved shirt and long-legged trousers + boots + gloves). This proposed REIis based on limited information, noting the uncertainties about the behaviour ofdichlorvos in /on mushrooms and in mushroom houses.Dichlorvos reassessment – application Page 331 of 436