AMBIENT AIR MONITORING NEAR

MOSAIC’S PHOSPHOGYPSUM STACK

EPC Board Meeting

August 18, 2011

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

DUST MONITORING SITE MAP

Existing

Monitoring

Stations

Additional

Monitoring

Stations

INSERT DUST CHARTPM 10 Air Quality Trend 2003-2007

Based on Annual 2nd Maximum 24-hour Average

0

20

40

60

80

100

120

140

160

2003 2004 2005 2006 2007

Co

ncen

trati

on

(u

g/m

3)

Causeway Davis Island Gardinier Gibsonton

Progress SADS National

National Standard

The dust monitoring showed no statistically

significant difference in dust concentrations

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

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

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

0.00

0.50

1.00

1.50

2.00

2.50

3.00

3.50

4.00

4.50

Gypstack

Average

Gibsonton

Elementary

School

Ippolito

Elementary

School

Progress

Village Middle

School

Control Site

pC

i/L

Winter 2010 Deployment Radon Levels

Measured

Radon Levels

EPA Action

Level

0.00

0.50

1.00

1.50

2.00

2.50

3.00

3.50

4.00

4.50

Gypstack

Average

Gibsonton

Elementary

School

Ippolito

Elementary

School

Progress

Village Middle

School

Control Site

pC

i/L

Summer 2010 Deployment Radon Levels

Measured

Radon Levels

EPA Action

Level

0

500

1000

1500

2000

2500

3000

3500

4000

Flight from NY

to LA

Dental X-ray Eating a banana Gypstack Avg School Avg

μR

/hr

Measured Gamma

Gamma Comparison Levels

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