1. AMBIENT AIR
MONITORING NEAR
MOSAIC’S
PHOSPHOGYPSUM STACK
EPC Board Meeting
August 18, 2011

2. DEVELOPMENT OF REGIONAL
IMPACT (DRI) #242
 DRI is a development having a
widespread impact on the community
 Development Order Specific Condition
A.8.a.
 Two ambient air dust samplers were
placed at Progress Village Middle
School and Gibsonton Elementary

3. DUST MONITORING SITE MAP
Existing
Monitoring
Stations
Additional
Monitoring
Stations

4. PM 10 Air Quality Trend 2003-2007
Based on Annual 2nd Maximum 24-hour Average
INSERT DUST CHART
Causeway Davis Island Gardinier Gibsonton
Progress SADS National
160
National Standard
140
Concentration (ug/m3)
120
100
80
60
40
20
0
2003 2004 2005 2006 2007
The dust monitoring showed no statistically
significant difference in dust concentrations

5. RADON MONITORING
 Phosphogypsum is stacked near the
chemical processing plants
 The radioactivity of the stacked
phosphogypsum is considered low level
 Radon gas is a colorless, odorless gas
that emanates from the ground
 In 2010, EPC entered into a contract
with the Florida Department of Health

6. RADON MONITORING SITE MAP
 Two rounds of monitoring were conducted
 16 sites around the gypstack were selected along
with the subject schools and a control site

7. MEASUREMENTS
 Radon study looked at alpha particles and gamma
rays
 Measurements were taken for 90 days
 Gamma readings were taken at the time of
deployment

8. Winter 2010 Deployment Radon Levels
4.50
4.00
3.50
3.00
2.50
Measured
pCi/L
Radon Levels
2.00
EPA Action
Level
1.50
1.00
0.50
0.00
Gypstack Gibsonton Ippolito Progress Control Site
Average Elementary Elementary Village Middle
School School School

9. Summer 2010 Deployment Radon Levels
4.50
4.00
3.50
3.00
2.50 Measured
pCi/L
Radon Levels
2.00
EPA Action
1.50
Level
1.00
0.50
0.00
Gypstack Gibsonton Ippolito Progress Control Site
Average Elementary Elementary Village Middle
School School School

10. Gamma Comparison Levels
4000
3500
3000
2500
μR/hr
2000
1500
1000
500
0
Flight from NY Dental X-ray Eating a banana Gypstack Avg School Avg
to LA
Measured Gamma

11. CONCLUSIONS
 The average for both the first and
second deployment at the gypstack is
0.68 pCi/L
 Based on the initial study, the results
do not indicate any elevated readings at
any of the schools
 Overall, the sampling periods showed
some differences