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<table style="font-size:10pt; font-family:'Times New Roman',times,serif;">
<tr>
<td>
<p style="FONT-FAMILY: times"><font size="3"><b>Accretion of Asset
Retirement Obligations</b></font></p>
<p style="FONT-FAMILY: times"><font size="2">We discuss our asset
retirement obligations in more detail in</font>
<font size="2"><i>Note 1</i></font> <font size="2">of our
2008 Annual Report on Form 10-K. The change in our "Asset
retirement obligations" liability during 2009 was as
follows:</font></p>
<div style="PADDING-RIGHT: 0pt; PADDING-LEFT: 0pt; PADDING-BOTTOM: 0pt; MARGIN-LEFT: 10%; WIDTH: 80%; PADDING-TOP: 0pt; POSITION: relative">
<p style="FONT-FAMILY: times"><font size="2">
<!-- COMMAND=ADD_TABLEWIDTH,"100%" --></font></p>
<!-- User-specified TAGGED TABLE -->
<div align="center">
<table cellspacing="0" cellpadding="0" width="100%" border="0">
<tr style="HEIGHT: 0px"><!-- TABLE COLUMN WIDTHS SET -->
<td style="FONT-FAMILY: times" align="left"></td>
<td style="FONT-FAMILY: times" width="12"></td>
<td style="FONT-FAMILY: times" align="right" width="6"></td>
<td style="FONT-FAMILY: times" width="59"></td>
<td style="FONT-FAMILY: times" width="12"></td>
<!-- TABLE COLUMN WIDTHS END --></tr>
<tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="bottom">
<th style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times"
align="center" colspan="4"> </th>
<th style="FONT-FAMILY: times"> </th></tr>
<tr style="HEIGHT: 0px" valign="bottom">
<th style="FONT-FAMILY: times" align="center">
<font size="2"> </font><br /></th>
<th style="FONT-FAMILY: times"><font size="2"> </font></th>
<th style="FONT-FAMILY: times" align="center" colspan="2">
<font size="2"><i>(In millions)</i></font><br /></th>
<th style="FONT-FAMILY: times">
<font size="2"> </font></th></tr>
<tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF">
<td style="FONT-FAMILY: times">
<p style="MARGIN-LEFT: 10pt; TEXT-INDENT: -10pt; FONT-FAMILY: times">
<font size="2">Liability at January 1, 2009</font></p></td>
<td style="FONT-FAMILY: times"><font size="2"> </font></td>
<td style="FONT-FAMILY: times" align="right">
<font size="2">$</font></td>
<td style="FONT-FAMILY: times" align="right">
<font size="2">987.3</font></td>
<td style="FONT-FAMILY: times">
<font size="2"> </font></td></tr>
<tr style="HEIGHT: 0px" valign="bottom" bgcolor="white">
<td style="FONT-FAMILY: times">
<p style="MARGIN-LEFT: 10pt; TEXT-INDENT: -10pt; FONT-FAMILY: times">
<font size="2">Accretion expense</font></p></td>
<td style="FONT-FAMILY: times"><font size="2"> </font></td>
<td style="FONT-FAMILY: times"><font size="2"> </font></td>
<td style="FONT-FAMILY: times" align="right">
<font size="2">54.6</font></td>
<td style="FONT-FAMILY: times">
<font size="2"> </font></td></tr>
<tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF">
<td style="FONT-FAMILY: times">
<p style="MARGIN-LEFT: 10pt; TEXT-INDENT: -10pt; FONT-FAMILY: times">
<font size="2">Liabilities incurred</font></p></td>
<td style="FONT-FAMILY: times"><font size="2"> </font></td>
<td style="FONT-FAMILY: times"><font size="2"> </font></td>
<td style="FONT-FAMILY: times" align="right">
<font size="2">0.1</font></td>
<td style="FONT-FAMILY: times">
<font size="2"> </font></td></tr>
<tr style="HEIGHT: 0px" valign="bottom" bgcolor="white">
<td style="FONT-FAMILY: times">
<p style="MARGIN-LEFT: 10pt; TEXT-INDENT: -10pt; FONT-FAMILY: times">
<font size="2">Liabilities settled</font></p></td>
<td style="FONT-FAMILY: times"><font size="2"> </font></td>
<td style="FONT-FAMILY: times"><font size="2"> </font></td>
<td style="FONT-FAMILY: times" align="right">
<font size="2">(0.7</font></td>
<td style="FONT-FAMILY: times"><font size="2">)</font></td></tr>
<tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF">
<td style="FONT-FAMILY: times">
<p style="MARGIN-LEFT: 10pt; TEXT-INDENT: -10pt; FONT-FAMILY: times">
<font size="2">Revisions to cash flows</font></p></td>
<td style="FONT-FAMILY: times"><font size="2"> </font></td>
<td style="FONT-FAMILY: times"><font size="2"> </font></td>
<td style="FONT-FAMILY: times" align="right">
<font size="2">(0.4</font></td>
<td style="FONT-FAMILY: times"><font size="2">)</font></td></tr>
<tr style="HEIGHT: 0px" valign="bottom" bgcolor="white">
<td style="FONT-FAMILY: times">
<p style="MARGIN-LEFT: 10pt; TEXT-INDENT: -10pt; FONT-FAMILY: times">
<font size="2">Other</font></p></td>
<td style="FONT-FAMILY: times"><font size="2"> </font></td>
<td style="FONT-FAMILY: times"><font size="2"> </font></td>
<td style="FONT-FAMILY: times" align="right">
<font size="2">(0.1</font></td>
<td style="FONT-FAMILY: times"><font size="2">)</font></td></tr>
<tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top">
<td style="BORDER-BOTTOM: #000000 1pt solid; FONT-FAMILY: times"
valign="bottom" colspan="4"> </td>
<td style="FONT-FAMILY: times" valign="bottom"> </td></tr>
<tr style="HEIGHT: 0px" valign="bottom" bgcolor="#CCEEFF">
<td style="FONT-FAMILY: times">
<p style="MARGIN-LEFT: 10pt; TEXT-INDENT: -10pt; FONT-FAMILY: times">
<font size="2">Liability at September 30, 2009</font></p></td>
<td style="FONT-FAMILY: times"><font size="2"> </font></td>
<td style="FONT-FAMILY: times" align="right">
<font size="2">$</font></td>
<td style="FONT-FAMILY: times" align="right">
<font size="2">1,040.8</font></td>
<td style="FONT-FAMILY: times">
<font size="2"> </font></td></tr>
<tr style="FONT-SIZE: 1.5pt; HEIGHT: 0px" valign="top">
<td style="BORDER-BOTTOM: #000000 2.25pt double; FONT-FAMILY: times"
valign="bottom" colspan="4"> </td>
<td style="FONT-FAMILY: times" valign="bottom">
</td></tr></table></div>
<!-- end of user-specified TAGGED TABLE --></div></td></tr></table>
Accretion of Asset
Retirement Obligations
We discuss our asset
retirement obligations in more detail in
Note 1 of our
2008 Annual Report on
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