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Dow Wild Game Study: Squirrel

bulletClick here for official Final report: MDCH Dioxins in Wild Game Taken from the Tittabawassee River Floodplain South of Midland, Midland and Saginaw Counties, Michigan EPA ID# MID980994354  Final Report April 29, 2005.  Report is officially peer reviewed and backed by the Federal Government ATSDR.
bulletClick here for official State of Michigan T.River Flood Plain Wild Game Consumption Advisory
bulletEPA indicates there is much more in the Tittabawassee River than contaminated fish and dioxin, click here
bulletEPA July 2004 Memo concerning Dow Wild Game Study
bulletPotential health risks to persons consuming game.
bulletDioxin contamination of game indicate contamination of the terrestrial food chain
bulletUnacceptable, serious aquatic ecological risks to fish, fish eating birds, and mammals.
bulletThere is particular concern regarding distortions of risk information which are causing inaccurate risk messages to the public.
bulletClick here to read the EPA 7/30/04 memo
bulletClick here to view raw data used to make the following charts

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Note: in the 'Radar" graph below, each circle gridline represents a threshold that is
at least 10 times the level of the adjacent circle inside it (logarithmic scale). 
Example: a sample plotted between the 10 and 100 grid rings represent values that are
at least 10 to 99 times the value of samples between the 1 and 10 rings and 100 to 999 times
the value of samples between the 0.1 and 1 rings.  Lines connect all the values in a series.
The individual data points represent sample TEQ values from the chart that follows.

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Squirrel Raw Data

 

Squirrel

Area

TEQ (pg/g)

Percent

(kg)

Wet Wt.

Lipids

Body Wt.

Age

Sex

TR01SL01M1

Ref area

0.061

3.3

0.794

IMMATURE

FEMALE

TR01SL02M1

Ref area

0.105

3.5

0.794

IMMATURE

MALE

TR01SL03M1

Ref area

0.04

4.07

0.539

IMMATURE

MALE

TR01SL04M1

Ref area

0.072

2.5

0.765

IMMATURE

FEMALE

TR01SL05M1

Ref area

0.076

5

0.992

SPRING BORN

MALE

TR01SL06M1

Ref area

0.057

3

0.936

IMMATURE

FEMALE

TR01SL07M1

Ref area

0.047

2.9

0.765

IMMATURE

FEMALE

TR01SL08M1

Ref area

0.107

3.1

0.794

ND

ND

TR01SL09M1

Ref area

0.086

5.4

0.879

IMMATURE

FEMALE

TR01SL10M1

Ref area

0.072

2

0.85

IMMATURE

FEMALE

TR01SL11M1

Ref area

0.06

3.4

0.992

SUMMERBORN

MALE

TR01SL12M1

Ref area

0.964

SPRING BORN

MALE

TR02SL01M1

Smith Crossing

0.092

6.07

0.822

IMMATURE

FEMALE

TR02SL02M1

Smith Crossing

0.107

8.5

0.992

IMMATURE

FEMALE

TR02SL03M1

Smith Crossing

0.25

3.1

0.595

SUBADULT

FEMALE

TR02SL04M1

Smith Crossing

0.127

3.3

0.879

IMMATURE

MALE

TR02SL05M1

Smith Crossing

0.205

6.9

1.134

IMMATURE

MALE

TR02SL06M1

Smith Crossing

0.503

5.3

0.879

SPRINGBORN

MALE

TR02SL07M1

Smith Crossing

0.664

1.2

0.964

IMMATURE

FEMALE

TR02SL08M1

Smith Crossing

0.375

4.5

1.191

IMMATURE

FEMALE

TR02SL09M1

Smith Crossing

0.226

5.7

0.765

IMMATURE

FEMALE

TR02SL10M1

Smith Crossing

1.48

7.1

0.765

SUBADULT

FEMALE

TR03SL01M1

Imerman Park

2.72

5.7

0.652

IMMATURE

FEMALE

TR03SL02M1

Imerman Park

4.29

6.7

0.936

MATURE

MALE

TR03SL03M1

Imerman Park

0.654

3.3

0.482

IMMATURE

MALE

TR03SL04M1

Imerman Park

0.687

4.5

0.765

ADULT

MALE

TR03SL05M1

Imerman Park

0.197

2.9

0.624

IMMATURE

FEMALE

TR03SL06M1

Imerman Park

0.162

2.9

0.539

IMMATURE

FEMALE

TR03SL07M1

Imerman Park

0.722

5.3

0.539

IMMATURE

MALE

TR03SL08M1

Imerman Park

0.083

2

0.765

EARLY SUMMER

MALE

TR03SL09M1

Imerman Park

3.57

3.5

0.822

IMMATURE

FEMALE

TR03SL10M1

Imerman Park

0.141

4.2

0.482

IMMATURE

FEMALE

 

bulletGES memo (7/16/04) to the MDEQ indicates the results of the Dow/Entrix Wild Game study in the Tittabawassee River Flood plain confirms findings of MDEQ/GES 2003 T.River Aquatic Ecological Risk Assesement.  Conclusions:
bulletReview of the Entrix (2004) report has shown that the data contained therein support one of the major conclusions of the Michigan DEQ terrestrial ecological risk assessment (GES, 2004), that is that biota and food chains on the Tittabawassee River downriver of Midland are contaminated by PCDDs and PCDFs. A reasonable conclusion from this is that predators and scavengers at the tops of these food chains are likely to be even more exposed to these contaminants than the deer, squirrels, and turkeys sampled in the Entrix (2004) study.
bulletHowever, the Entrix (2004) study was designed to generate data for an evaluation of risk to human health, rather than to ecological receptors. Because of this, design elements in the Entrix (2004) study, though perhaps appropriate for a human health risk analysis, result in an underestimation of the contaminant concentrations to which wildlife would be exposed and, hence, the magnitude of the risks incurred. These design elements comprise:
bulletThe sampling was confined to organisms which, because of their diets, are unlikely to bioaccumulate PCDDs and PCDFs to the extent that other organisms would.
bulletThe carcass handling procedures resulted in a likely underestimation of the magnitudes of the PCDD/PCDF whole-body burdens to which predators and scavengers may be exposed.
bulletThe sample spatial distribution almost certainly results in an underestimation of the PCDD/PCDF body burdens of turkeys in the lower sections of the floodplain, and, hence, in the potential exposures to their predators and scavengers.
bulletClick here to read the entire July 2004 memo
bulletTittabawassee River Aquatic Ecological Risk Assessment Slide Show
bulletTittabawassee River Aquatic Ecological Risk Assesement Final Report (pdf)

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