Gilson and Voss - Voss Associates

RADON FACTS
1 working level =
222
3 DAC Rn (including progeny)
= 1.3 E5 MeV / liter of air á energy
= 100 pCi / liter (1 E-7 ìCi / ml)
= 20.8 ìJoules / m 3
1 working level-month = 1 rem CEDE
10,000 pCi / l in water 1pCi / l in air thru evaporation.
EPA ACTION LEVELS FOR RADON GAS IN HOMES
Concentration (pCi/l) Sampling frequency
0 - 4 initial & no follow-up
4 - 20 one year & follow-up
20 - 200 3 month & follow-up
>200 implement radon reduction methods
4 pCi / l in living area 1.03 working level-month 1 rem
PROPOSED EPA ACTION LEVELS
FOR RADON IN DRINKING WATER
Maximum Contaminant Level - MCL is 300 pCi / L of radon in
water of community water systems.
Alternative Maximum Contaminant Level - AMCL is 4,000 pCi /
L of radon in water of community water systems.
To comply with the AMCL limit the state or the CWS
(Community Water System) must implement a Multi-Media
Mitigation plan to address the radon in the air of residences.
The proposed rule would not apply to CWSs that use soley
surface water.
The proposed rule requires monitoring for radon in drinking
water. The monitoring frequency varies from once per quarter
to once in 9 years based on radon concentrations.
Page 142
RADON FACTS
1 working level =
222
3 DAC Rn (including progeny)
= 1.3 E5 MeV / liter of air á energy
= 100 pCi / liter (1 E-7 ìCi / ml)
= 20.8 ìJoules / m 3
1 working level-month = 1 rem CEDE
10,000 pCi / l in water 1pCi / l in air thru evaporation.
EPA ACTION LEVELS FOR RADON GAS IN HOMES
Concentration (pCi/l) Sampling frequency
0 - 4 initial & no follow-up
4 - 20 one year & follow-up
20 - 200 3 month & follow-up
>200 implement radon reduction methods
4 pCi / l in living area 1.03 working level-month 1 rem
PROPOSED EPA ACTION LEVELS
FOR RADON IN DRINKING WATER
Maximum Contaminant Level - MCL is 300 pCi / L of radon in
water of community water systems.
Alternative Maximum Contaminant Level - AMCL is 4,000 pCi /
L of radon in water of community water systems.
To comply with the AMCL limit the state or the CWS
(Community Water System) must implement a Multi-Media
Mitigation plan to address the radon in the air of residences.
The proposed rule would not apply to CWSs that use soley
surface water.
The proposed rule requires monitoring for radon in drinking
water. The monitoring frequency varies from once per quarter
to once in 9 years based on radon concentrations.
Page 142
RADON FACTS
1 working level =
222
3 DAC Rn (including progeny)
= 1.3 E5 MeV / liter of air á energy
= 100 pCi / liter (1 E-7 ìCi / ml)
= 20.8 ìJoules / m 3
1 working level-month = 1 rem CEDE
10,000 pCi / l in water 1pCi / l in air thru evaporation.
EPA ACTION LEVELS FOR RADON GAS IN HOMES
Concentration (pCi/l) Sampling frequency
0 - 4 initial & no follow-up
4 - 20 one year & follow-up
20 - 200 3 month & follow-up
>200 implement radon reduction methods
4 pCi / l in living area 1.03 working level-month 1 rem
PROPOSED EPA ACTION LEVELS
FOR RADON IN DRINKING WATER
Maximum Contaminant Level - MCL is 300 pCi / L of radon in
water of community water systems.
Alternative Maximum Contaminant Level - AMCL is 4,000 pCi /
L of radon in water of community water systems.
To comply with the AMCL limit the state or the CWS
(Community Water System) must implement a Multi-Media
Mitigation plan to address the radon in the air of residences.
The proposed rule would not apply to CWSs that use soley
surface water.
The proposed rule requires monitoring for radon in drinking
water. The monitoring frequency varies from once per quarter
to once in 9 years based on radon concentrations.
Page 142
RADON FACTS
1 working level =
222
3 DAC Rn (including progeny)
= 1.3 E5 MeV / liter of air á energy
= 100 pCi / liter (1 E-7 ìCi / ml)
= 20.8 ìJoules / m 3
1 working level-month = 1 rem CEDE
10,000 pCi / l in water 1pCi / l in air thru evaporation.
EPA ACTION LEVELS FOR RADON GAS IN HOMES
Concentration (pCi/l) Sampling frequency
0 - 4 initial & no follow-up
4 - 20 one year & follow-up
20 - 200 3 month & follow-up
>200 implement radon reduction methods
4 pCi / l in living area 1.03 working level-month 1 rem
PROPOSED EPA ACTION LEVELS
FOR RADON IN DRINKING WATER
Maximum Contaminant Level - MCL is 300 pCi / L of radon in
water of community water systems.
Alternative Maximum Contaminant Level - AMCL is 4,000 pCi /
L of radon in water of community water systems.
To comply with the AMCL limit the state or the CWS
(Community Water System) must implement a Multi-Media
Mitigation plan to address the radon in the air of residences.
The proposed rule would not apply to CWSs that use soley
surface water.
The proposed rule requires monitoring for radon in drinking
water. The monitoring frequency varies from once per quarter
to once in 9 years based on radon concentrations.
Page 142