<SUBMISSION>
<ACCESSION-NUMBER>0000950129-07-003166
<TYPE>11-K
<PUBLIC-DOCUMENT-COUNT>2
<PERIOD>20061231
<FILING-DATE>20070628
<DATE-OF-FILING-DATE-CHANGE>20070628
<FILER>
<COMPANY-DATA>
<CONFORMED-NAME>WASTE MANAGEMENT INC
<CIK>0000823768
<ASSIGNED-SIC>4953
<IRS-NUMBER>731309529
<STATE-OF-INCORPORATION>DE
<FISCAL-YEAR-END>1231
</COMPANY-DATA>
<FILING-VALUES>
<FORM-TYPE>11-K
<ACT>34
<FILE-NUMBER>001-12154
<FILM-NUMBER>07947228
</FILING-VALUES>
<BUSINESS-ADDRESS>
<STREET1>1001 FANNIN STREET
<STREET2>STE 4000
<CITY>HOUSTON
<STATE>TX
<ZIP>77002
<PHONE>7135126200
</BUSINESS-ADDRESS>
<MAIL-ADDRESS>
<STREET1>1001 FANNIN STREET
<STREET2>SUITE 4000
<CITY>HOUSTON
<STATE>TX
<ZIP>77002
</MAIL-ADDRESS>
<FORMER-COMPANY>
<FORMER-CONFORMED-NAME>USA WASTE SERVICES INC
<DATE-CHANGED>19920703
</FORMER-COMPANY>
</FILER>
<DOCUMENT>
<TYPE>11-K
<SEQUENCE>1
<FILENAME>h47873be11vk.htm
<DESCRIPTION>FORM 11-K
<TEXT>
<HTML>
<HEAD>
<TITLE>e11vk</TITLE>
</HEAD>
<BODY bgcolor="#FFFFFF">
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<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 1pt solid black; font-size: 1pt">&nbsp;</DIV>




<DIV align="center" style="font-size: 14pt; margin-top: 12pt"><B>UNITED STATES SECURITIES AND EXCHANGE COMMISSION</B>
</DIV>

<DIV align="center" style="font-size: 12pt"><B>Washington, D.C. 20549</B>
</DIV>

<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 16pt; border-top: 3px double #000000">&nbsp;</DIV>
</DIV>


<DIV align="center" style="font-size: 18pt; margin-top: 12pt"><B>FORM 11-K</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt">(Mark One)
</DIV>

<DIV align="center">
<TABLE cellspacing="0" border="0" cellpadding="0" width="100%" style="font-size: 12pt">
<TR style="font-size: 6pt">
    <TD width="7%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR valign="top">
    <TD align="center"><FONT face="Wingdings">&#254;</FONT></TD>
    <TD>&nbsp;</TD>
    <TD><B>ANNUAL REPORT PURSUANT TO SECTION 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934</B></TD>
</TR>
</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 12%"><B><B>For the fiscal year ended December&nbsp;31, 2006</B>
</B>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>or</B></DIV>

<DIV align="center">
<TABLE cellspacing="0" border="0" cellpadding="0" width="100%" style="font-size: 12pt">
<TR style="font-size: 6pt">
    <TD width="7%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="88%">&nbsp;</TD>
</TR>
<TR valign="top">
    <TD align="center"><FONT face="Wingdings">&#111;</FONT></TD>
    <TD>&nbsp;</TD>
    <TD><B>TRANSITION REPORT PURSUANT TO SECTION 15(d)
OF THE SECURITIES EXCHANGE ACT OF 1934</B></TD>
</TR>
</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt; margin-left: 12%"><B><B>For the transition period from <U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U> to </B><U>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</U>
</B>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>Commission file number 1-12154</B></DIV>
<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 16pt; border-top: 3px double #000000">&nbsp;</DIV>
</DIV>


<DIV align="center" style="font-size: 20pt; margin-top: 12pt"><B>WASTE MANAGEMENT RETIREMENT SAVINGS PLAN</B>
</DIV>
<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 16pt; border-top: 3px double #000000">&nbsp;</DIV>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 12pt"><B>Waste Management, Inc.<BR>
1001 Fannin Street<BR>
Suite&nbsp;4000<BR>
Houston, TX 77002</B></DIV>


<DIV style="width: 100%; border-bottom: 1pt solid black; margin-top: 10pt; font-size: 1pt">&nbsp;</DIV>
<DIV style="width: 100%; border-bottom: 2pt solid black; font-size: 1pt">&nbsp;</DIV>





<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><U>WASTE MANAGEMENT RETIREMENT SAVINGS PLAN</U>
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt"><U>INDEX TO FINANCIAL STATEMENTS AND SUPPLEMENTAL SCHEDULE</U>

</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="94%">&nbsp;</TD>
    <TD width="3%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><A href="#107">Report of Independent Registered Public Accounting Firm</A></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Audited Financial Statements</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px"><A href="#108">Statements of Net Assets Available for Benefits as of December&nbsp;31, 2006 and 2005</A></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px"><A href="#109">Statement of Changes in Net Assets Available for Benefits for the Year Ended December&nbsp;31, 2006</A></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">3</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px"><A href="#110">Notes to Financial Statements</A></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">4</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px"><A href="#111">Supplemental Schedule</A></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px"><A href="#112">Schedule&nbsp;H, Line 4(i) &#150; Schedule of Assets (Held At End of Year)</A></DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">17</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="left">
<A name="107"></A>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt">Report of Independent Registered Public Accounting Firm
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Administrative Committee<BR>
Waste Management Retirement Savings Plan

</DIV>
<DIV align="left" style="font-size: 10pt; margin-top: 6pt">We have audited the accompanying statements of net assets available for benefits of the Waste
Management Retirement Savings Plan as of December&nbsp;31, 2006 and 2005, and the related statement of
changes in net assets available for benefits for the year ended December&nbsp;31, 2006. These financial
statements are the responsibility of the Plan&#146;s management. Our responsibility is to express an
opinion on these financial statements based on our audits.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">We conducted our audits in accordance with the standards of the Public Company Accounting Oversight
Board (United States). Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of material misstatement. We
were not engaged to perform an audit of the Plan&#146;s internal control over financial reporting. Our
audits included consideration of internal control over financial reporting as a basis for designing
audit procedures that are appropriate in the circumstances, but not for the purpose of expressing
an opinion on the effectiveness of the Plan&#146;s internal control over financial reporting.
Accordingly, we express no such opinion. An audit also includes examining, on a test basis,
evidence supporting the amounts and disclosures in the financial statements, assessing the
accounting principles used and significant estimates made by management, and evaluating the overall
financial statement presentation. We believe that our audits provide a reasonable basis for our
opinion.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">In our opinion, the financial statements referred to above present fairly, in all material
respects, the net assets available for benefits of the Plan at December&nbsp;31, 2006 and 2005, and the
changes in its net assets available for benefits for the year ended December&nbsp;31, 2006, in
conformity with U.S. generally accepted accounting principles.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Our audits were performed for the purpose of forming an opinion on the financial statements taken
as a whole. The accompanying supplemental schedule of assets (held at end of year) as of December
31, 2006, is presented for purposes of additional analysis and is not a required part of the
financial statements but is supplementary information required by the Department of Labor&#146;s Rules
and Regulations for Reporting and Disclosure under the Employee Retirement Income Security Act of
1974. This supplemental schedule is the responsibility of the Plan&#146;s management. The supplemental
schedule has been subjected to the auditing procedures applied in our audits of the financial
statements and, in our opinion, is fairly stated in all material respects in relation to the
financial statements taken as a whole.
</DIV>

<DIV align="right" style="font-size: 10pt; margin-top: 6pt">/s/ Ernst
&#038; Young LLP&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</div>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Houston, Texas<BR>
June&nbsp;27, 2007

</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->1<!-- /Folio -->
</DIV>

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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt">Waste Management Retirement Savings Plan
</DIV>

<DIV align="left">
<A name="108"></A>
</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">Statements of Net Assets Available for Benefits

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">December&nbsp;31, 2006 and 2005

</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="76%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2006</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2005</TD>
    <TD>&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">ASSETS:</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">INVESTMENTS, at fair value:</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Plan interest in the Master Trust (Note 4)</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,311,397,465</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,146,799,984</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Participant loans</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">56,849,075</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">55,646,569</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Total investments</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,368,246,540</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,202,446,553</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">RECEIVABLES:</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Employee contributions</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,537,703</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,425,462</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Employer contributions</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">977,119</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,678,370</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Total receivables</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,514,822</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">3,103,832</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Total assets</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,370,761,362</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,205,550,385</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">LIABILITIES:</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Employee contributions pending transfer to affiliated plan</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">27,370</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Total liabilities</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">27,370</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">NET ASSETS AVAILABLE FOR BENEFITS, at fair value</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,370,733,992</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,205,550,385</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Adjustment from fair value to contract value
for fully benefit-responsive investment contracts</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,533,056</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,455,027</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">NET ASSETS AVAILABLE FOR BENEFITS</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,373,267,048</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,208,005,412</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 18pt"><I>The accompanying notes are an integral part of these financial statements.</I>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->2<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt">Waste Management Retirement Savings Plan
</DIV>

<DIV align="left">
<A name="109"></A>
</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">Statement of Changes in Net Assets Available for Benefits

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">Year Ended December&nbsp;31, 2006

</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="88%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">ADDITIONS TO NET ASSETS AVAILABLE FOR BENEFITS:</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Contributions-</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Employee</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">80,164,957</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Rollover</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">4,214,880</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Employer</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">45,269,788</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">129,649,625</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Net investment gain from the Master Trust (Note 4)</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">145,129,064</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Participant loan interest</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">3,875,622</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:60px; text-indent:-15px">Total additions</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">278,654,311</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">DEDUCTIONS FROM NET ASSETS AVAILABLE FOR BENEFITS:</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Benefits paid to participants</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">113,381,926</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Plan transfers</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">10,749</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:45px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:60px; text-indent:-15px">Total deductions</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">113,392,675</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">NET INCREASE IN NET ASSETS AVAILABLE FOR BENEFITS</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">165,261,636</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">NET ASSETS AVAILABLE FOR BENEFITS:</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Beginning of year</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,208,005,412</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">End of year</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,373,267,048</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV style="font-size: 10pt; margin-top: 18pt"><I>The accompanying notes are an integral part of these financial statements.</I>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->3<!-- /Folio -->
</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt">Waste Management Retirement Savings Plan
</DIV>

<DIV align="left">
<A name="110"></A>
</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">Notes to Financial Statements

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">December&nbsp;31, 2006

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>1. Description of Plan</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The following description of the Waste Management Retirement Savings Plan (the &#147;Plan&#148;) provides
only general information. Participants should refer to the Summary Plan Description and the Plan
document for a more complete description of the Plan&#146;s provisions.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B>General</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The Plan is a defined contribution plan available to all eligible employees, and their
beneficiaries, of Waste Management, Inc., and subsidiaries (&#147;Waste Management&#148; or the &#147;Company&#148;).
The Plan is subject to the provisions of the Employee Retirement Income Security Act of 1974, as
amended (&#147;ERISA&#148;).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B>Administration</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The board of directors of the Company has named the Administrative Committee of the Waste
Management Employee Benefit Plans (the &#147;Administrative Committee&#148;) to serve as administrator and
fiduciary of the Plan. Waste Management has entered into a Defined Contribution Plans Master Trust
Agreement (the &#147;Master Trust&#148;) with State Street Bank and Trust Company (&#147;State Street&#148;) whereby
State Street serves as trustee of the Plan. CitiStreet LLC (&#147;CitiStreet&#148;), an affiliate of State
Street, serves as record keeper.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B>Eligibility</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Employees (as defined by the Plan) are eligible to participate in the Plan following completion of
a 90-day period of service (as defined by the Plan).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Individuals who are ineligible to participate in the Plan consist of (a)&nbsp;leased employees, (b)
employees whose employment is governed by a collective bargaining agreement under which retirement
benefits are the subject of good faith bargaining, unless such agreement expressly provides for
participation in the Plan, (c)&nbsp;individuals providing services to the Company as independent
contractors, (d)&nbsp;employees performing services on a seasonal or temporary basis, (e)&nbsp;certain
nonresident aliens who have no earned income from sources within the United States of America and
(f)&nbsp;individuals who are participants in certain other pension, retirement, profit-sharing, stock
bonus, thrift or savings plans maintained by the Company other than the Waste Management Pension
Plan for Collectively Bargained Employees or such other plans as may from time to time be
determined by the Administrative Committee. Certain United States citizens employed by foreign
affiliates of the Company may participate in the Plan under certain provisions specified by the
Plan.
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->4<!-- /Folio -->
</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt">Waste Management Retirement Savings Plan
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">Notes to Financial Statements (continued)

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>1. Description of Plan (continued)</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B>Contributions</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Participants may contribute from one percent to 25&nbsp;percent of their pre-tax compensation, as
defined by the Plan, not to exceed certain limits as described in the Plan document (&#147;Employee
Contribution&#148;). In addition, participants that are age 50 or older were eligible to make catch-up
contributions of up to $5,000 of pre-tax compensation in 2006. After-tax contributions are not
permitted by the Plan. Participants may also contribute amounts representing distributions from
other qualified plans (&#147;Rollover Contribution&#148;). The Company matches 100&nbsp;percent of each
participant&#146;s Employee Contribution up to three percent of the participant&#146;s compensation, as
defined by the Plan, plus 50&nbsp;percent of the participant&#146;s Employee Contribution in excess of three
percent of the participant&#146;s compensation up to six percent of the participant&#146;s compensation
(&#147;Employer Contribution&#148;).
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B>Investment Options</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The Plan, through its investments in the Master Trust, currently offers participants six common
collective trust funds; a Company common stock fund; a self-managed account, which allows
participants to select various securities sold on the New York Stock Exchange, American Stock
Exchange and NASDAQ; and five target retirement-date funds, which are also common collective trust
funds. Prior to May&nbsp;22, 2006, the Plan offered participants three asset allocation models, which
were balanced among the six common collective trust funds, in place of the five target
retirement-date funds currently offered. Several restrictions apply, and a minimum balance is
required to participate in the self-managed account. The Plan utilizes cash equivalents to
temporarily hold monies pending settlement for transactions initiated by participants.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Each participant who has invested in the Company common stock fund has the right to vote the shares
of stock in his or her account with respect to any matter that comes before the shareholders for a
vote. Additionally, if a participant invests in the self-managed account, the participant has the
right to vote the shares of any common stock held in the participant&#146;s account.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B>Vesting</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Participants are immediately vested in their Employee Contribution, Rollover Contribution and
Employer Contribution accounts, plus earnings thereon.
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->5<!-- /Folio -->
</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt">Waste Management Retirement Savings Plan
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">Notes to Financial Statements (continued)

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>1. Description of Plan (continued)</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B>Participant Accounts</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Each participant&#146;s account is credited with the participant&#146;s Employee Contribution, Rollover
Contribution and Employer Contribution and an allocation of investment income and loss and
expenses. Investment income and loss is allocated to the participant&#146;s account based upon the
participant&#146;s proportionate share of the funds within the Master Trust.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B>Payment of Benefits</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Upon retirement, disability or termination of employment, participants or, in the case of a
participant&#146;s death, their designated beneficiaries, may make withdrawals from their accounts as
specified by the Plan. Prior to termination, participants who have reached age 59-1/2 may withdraw
from the vested portion of their accounts. Distributions are made by a single lump-sum payment or
direct rollover. Distribution of accounts invested in Company common stock may be taken in whole
shares of common stock or cash.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Participants may also make withdrawals from the pre-tax portion of their accounts, excluding
certain earnings, in the event of proven financial hardship of the participant. Not more than one
hardship withdrawal is permitted in any 12-month period, and the participant is not permitted to
contribute to the Plan or any other plans maintained by the Company for six months after receiving
the hardship distribution.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B>Loans</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Participants who are active employees may obtain loans of not less than $1,000 and a maximum of 50
percent of the participants&#146; vested accounts (excluding any amounts invested in the self-managed
account) immediately preceding the loan grant date. In no event shall a loan exceed $50,000,
reduced by the greater of (a)&nbsp;the highest outstanding balance of loans during the one-
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->6<!-- /Folio -->
</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt">Waste Management Retirement Savings Plan
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">Notes to Financial Statements (continued)

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>1. Description of Plan (continued)</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">year period ending on the date before a new loan is made or modified, or (b)&nbsp;the outstanding
balance of loans on the date a new loan is made or modified. Not more than one loan shall be
outstanding at any time, except for multiple loans which (a)&nbsp;existed prior to January&nbsp;1, 1999, (b)
result from a merger of another plan into this Plan or (c)&nbsp;result from a participant&#146;s loan
becoming taxable under Section 72(p) of the Internal Revenue Code of 1986, as amended (the &#147;Code&#148;).
Interest rates and repayment terms are established by the Administrative Committee. Such loans
shall be repaid by payroll deduction, or any other method approved by the Administrative Committee.
The Administrative Committee requires that (i)&nbsp;repayments be made no less frequently that
quarterly; (ii)&nbsp;loans be repaid over a period not to exceed 54&nbsp;months; and (iii)&nbsp;repayments be
applied to principal using a level amortization over the repayment period.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B>Administrative Expenses</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Master Trust administrative expenses, including trustee and investment management fees, are
allocated in proportion to the investment balances of the underlying plans. Loan administration
fees are charged directly to the account balance of the participant electing the loan. Plan level
administrative expenses, which include primarily recordkeeping fees, are allocated directly to the
respective plan. Administrative expenses are reflected as a reduction of Master Trust investment
income and are included in net investment gain from the Master Trust in the accompanying Statement
of Changes in Net Assets Available for Benefits. In 2006, the Company elected to pay certain audit
and legal fees of the Plan.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>2. Summary of Accounting Policies</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B>Basis of Accounting</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The accompanying financial statements of the Plan have been prepared using the accrual basis of
accounting in accordance with U.S. generally accepted accounting principles. Benefits are recorded
when paid.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B>New Accounting Pronouncement</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">On December&nbsp;29, 2005, the Financial Accounting Standards Board issued Financial Accounting
Standards Board (&#147;FASB&#148;) Staff Position AAG INV-1 and SOP 94-4-1, <I>Reporting of Fully
Benefit-Responsive Investment Contracts Held by Certain Investment Companies Subject to the AICPA
Investment Company Audit Guide and Defined-Contribution Health and Welfare and Pension Plans </I>(the
&#147;FSP&#148;). The FSP defines the circumstances in which an investment contract is considered fully
benefit-responsive and provides certain reporting and disclosure requirements
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->7<!-- /Folio -->
</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt">Waste Management Retirement Savings Plan
</DIV>


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">Notes to Financial Statements (continued)

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>2. Summary of Accounting Policies (continued)</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">for fully benefit-responsive investment contracts. The FSP requires fully benefit-responsive
investment contracts held by defined-contribution plans to be reported at fair value. The FASB
continues to recognize that contract value is a relevant measurement attribute for fully
benefit-responsive investment contracts because contract values are representative of the amount
that participants would receive if they were to initiate permitted transactions under the terms of
the Plan. Accordingly, the FSP requires that the Statements of Net Assets Available for Benefits
present both the fair value of fully benefit-responsive investment contracts and a reconciling
adjustment from fair value to contract value of fully benefit-responsive investment contracts to
arrive at Net Assets Available for Benefits.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The Plan has adopted the FSP as of December&nbsp;31, 2006. The requirements of the FSP have been applied
retroactively to the accompanying Statement of Net Assets Available for Benefits as of December&nbsp;31,
2005 as a result of the adoption of the FSP. The FSP did not impact the Statement of Changes in Net
Assets Available for Benefits, which continues to be presented on a contract value basis.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B>Use of Estimates</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The preparation of the financial statements, and accompanying notes and schedule, requires
management to make estimates that affect accounting for and recognition of plan assets and
liabilities and additions and deductions to/from net assets available for benefits. These
estimates must be made because certain of the information used is dependent on future events, which
cannot be calculated with a high degree of precision from available data or simply cannot be
readily calculated based on generally accepted methodologies. In some cases, management must
exercise significant judgment. Actual results could differ from those estimates.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B>Investments</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The purpose of the Master Trust is the collective investment of the assets of participating
employee benefit plans of the Company and its subsidiaries. The Master Trust&#146;s assets are
allocated among participating plans by assigning to each plan those transactions (primarily
contributions, benefit payments and certain administrative expenses) which can be specifically
identified, and by allocating among all plans, in proportion to the fair value of the assets
assigned to each plan, income and expenses resulting from the collective investment of the assets
of the Master Trust. Corporate stocks and mutual funds held by the Master Trust are stated at fair
value based on quoted market prices as of the financial statement date. The fair values of the
common collective trust funds held by the Master Trust are generally based on net asset values
established by State Street (the issuer of the common collective trust funds) based on fair values
of the
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->8<!-- /Folio -->
</DIV>

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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">Waste Management Retirement Savings Plan

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">Notes to Financial Statements (continued)

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>2. Summary of Accounting Policies (continued)</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">underlying assets. The common collective trust funds held by the Master Trust include a Stable
Value Fund that invests in guaranteed investment contracts (&#147;GICs&#148;) and synthetic investment
contracts (&#147;Synthetic GICs&#148;). The fair value measurement of these investments is discussed further
in Note 3. Short-term investments and loans to participants are stated at cost, which approximates
fair value. The Master Trust records purchases and sales of securities on a trade-date basis and
dividends on the ex-dividend date.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><B>Risks and Uncertainties</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The Plan provides for investments in various securities that, in general, are exposed to various
risks, such as interest rate, credit, and overall market volatility risks. Due to the level of
risk associated with certain investment securities, it is reasonably possible that changes in the
values of investment securities will occur in the near term and that such changes could materially
affect the amounts reported in the Statements of Net Assets Available for Benefits and participant
account balances.
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>3. Investment Contracts</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The common collective trust funds held by the Master Trust include a Stable Value Fund that invests
in fully benefit-responsive GICs and Synthetic GICs. The Plan&#146;s adoption of the FSP discussed in
Note 2 resulted in a change in the required presentation and disclosures associated with GICs and
Synthetic GICs. The following disclosures provide information about the nature of these investments
and how fair values of these investments are measured. For information related to the changes in
presentation required as a result of the adoption of the FSP, refer to Note 2.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><I>Guaranteed Investment Contracts </I>- GICs are contracts that provide a specified rate of return for a
specific period of time. The fair values of the GICs included in the Plan&#146;s Stable Value Fund are
measured by State Street using a discounted cash flow methodology. Under this approach, the cash
flows of each individual contract are discounted at the prevailing interpolated swap rate as of the
appropriate measurement date.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><I>Synthetic Guaranteed Investment Contracts </I>- Synthetic GICs are comprised of (i)&nbsp;individual assets
or investments placed in a trust and (ii)&nbsp;wrapper contracts that guarantee that participant
transactions will be executed at contract value. The investment portfolio of a Synthetic GIC when
coupled with a wrapper contract attempts to replicate the investment characteristics of traditional
GICs.
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->9<!-- /Folio -->
</DIV>

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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">Waste Management Retirement Savings Plan

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">Notes to Financial Statements (continued)

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>3. Investment Contracts (continued)</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">State Street measures the fair value of the Synthetic GICs included in the Plan&#146;s Stable Value Fund
as follows:
</DIV>

<DIV style="margin-top: 6pt">
<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">

<TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD><I>Fair value of individual assets and investments </I>-
Individual assets and investments are valued at representative
quoted market prices when available. Short-term securities, if
any, are stated at amortized cost, which approximates fair
value. Debt securities are valued by a pricing service based
on market transactions for comparable securities and various
relationships between securities that are generally recognized
by institutional traders. Investments in regulated investment
companies or collective investment funds are valued at the net
asset value per share or unit on the valuation date. Any
accrued interest on the underlying investments is also
included as a component of the fair value of those
investments.</TD>
</TR>

<TR>
    <TD style="font-size: 6pt">&nbsp;</TD>
</TR><TR valign="top" style="font-size: 10pt; color: #000000; background: transparent">
    <TD width="3%" nowrap align="left"><B>&#149;</B></TD>
    <TD width="1%">&nbsp;</TD>
    <TD><I>Fair value of wrapper contracts </I>- The fair value of
wrapper contracts is determined using a market approach
discounting methodology that incorporates the difference
between current market level rates for contract level wrap
fees and the wrap fee being charged for the Synthetic GIC.
This difference is calculated as a dollar value and discounted
by the prevailing interpolated swap rate as of the appropriate
measurement date.</TD>
</TR>

</TABLE>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>4. Plan Interest in the Master Trust</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The Plan
investments are held in the Master Trust along with the Waste
Management Retirement Savings Plan for Bargaining Unit Employees (the
&#147;Union Plan&#148;). As of December&nbsp;31, 2006 and 2005, the Plan&#146;s beneficial interest in the net
assets of the Master Trust was 99.72% and 99.75%, respectively.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Neither the Plan nor the Union Plan has an undivided interest in the investments held in the Master
Trust since each plan&#146;s interest in the investments of the Master Trust is based on the account
balances of the participants and their elected investment fund options. However, the Plan&#146;s
beneficial interest in each of the underlying investment fund options does not vary significantly
from the Plan&#146;s beneficial interest in the total net assets of the Master Trust.
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->10<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">Waste Management Retirement Savings Plan

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">Notes to Financial Statements (continued)

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>4. Plan Interest in the Master Trust (continued)</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The net assets of the Master Trust consist of the following:
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="76%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="6" style="border-bottom: 0px solid #000000">December 31,</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2006</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2005</TD>
    <TD>&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Assets-</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Investments, at fair value-</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Common collective trust funds</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,171,802,378</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,029,307,424</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Short-term investments</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,798,959</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,060,205</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Corporate stocks</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">9,968,353</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">8,856,730</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Waste Management, Inc. common stock</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">117,083,348</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">97,263,653</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Mutual funds</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">13,384,021</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">11,526,233</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Other</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">106,425</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">366,109</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:60px; text-indent:-15px">Total investments</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,315,143,484</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,149,380,354</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Securities sold receivable</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">296,094</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Interest receivable</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,009,442</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,100,499</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Cash, non-interest bearing</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">18,066</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">25,188</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:60px; text-indent:-15px">Total assets</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,316,170,992</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,150,802,135</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Liabilities-</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Administative fees payable</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">953,256</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,119,106</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Securities purchased payable</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">86,586</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:60px; text-indent:-15px">Total liabilities</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,039,842</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,119,106</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:45px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:60px; text-indent:-15px">Total net assets</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,315,131,150</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">1,149,683,029</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Adjustment from fair value to contract value
for fully benefit-responsive contracts</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,535,060</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,457,204</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,317,666,210</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,152,140,233</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->11<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="center" style="font-size: 10pt; margin-top: 18pt">Waste Management Retirement Savings Plan
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt">Notes to Financial Statements (continued)
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>4. Plan Interest in the Master Trust (continued)</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Respective interests in the net assets of the Master Trust by the Plan and the Union Plan are as
follows:
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="76%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="6" style="border-bottom: 0px solid #000000">December 31,</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2006</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2005</TD>
    <TD>&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Net assets, fair value:</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Plan interest</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,311,397,465</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,146,799,984</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Union Plan interest</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">3,733,685</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,883,045</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Total</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,315,131,150</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,149,683,029</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Adjustment from fair value to contract value for fully
benefit-responsive contracts:</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Plan interest</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">2,533,056</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">2,455,027</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Union Plan interest</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,004</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,177</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:60px; text-indent:-15px">Total</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">2,535,060</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,457,204</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Net assets, fully benefit-responsive contracts at contract value:</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Plan interest</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,313,930,521</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,149,255,011</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Union Plan interest</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">3,735,689</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,885,222</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Total</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,317,666,210</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,152,140,233</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->12<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">


<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">Waste Management Retirement Savings Plan

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">Notes to Financial Statements (continued)

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>4. Plan Interest in the Master Trust (continued)</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Income or loss from investments held in the Master Trust for the year ended December&nbsp;31, 2006, was
as follows:
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="88%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Interest</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">12,089,321</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Dividends</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">829,413</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Dividends &#151; Waste Management, Inc. common stock</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">2,854,650</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Other income (loss)</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(18,052</TD>
    <TD nowrap>)</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Net appreciation/(depreciation) in fair value of-</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Common collective trust funds</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">114,550,367</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Corporate stocks</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">325,399</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Waste Management, Inc. common stock</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">20,674,046</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Other</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(76,667</TD>
    <TD nowrap>)</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Mutual funds</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(1,361,213</TD>
    <TD nowrap>)</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:45px; text-indent:-15px">Total net appreciation in fair value of investments</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">134,111,932</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:60px; text-indent:-15px">Total investment gain</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">149,867,264</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Administrative fees</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">4,318,103</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:60px; text-indent:-15px">Net gain</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">145,549,161</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Plan interest in net investment gain from the Master Trust</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">145,129,064</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Union Plan interest in net investment gain from the Master Trust</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">420,097</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>5. Federal Income Taxes</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The Plan has received a determination letter from the Internal Revenue Service (&#147;IRS&#148;) dated June
20, 2002, stating that the Plan is qualified under Section 401(a) of the Code and, therefore, the
related trust is exempt from taxation. Subsequent to this determination by the IRS, the Plan was
amended. Once qualified, the Plan is required to operate in conformity with the Code to maintain
its qualification. The Plan Sponsor has indicated that it will take the necessary steps, if any, to
bring the Plan&#146;s operations into compliance with the Code.
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->13<!-- /Folio -->
</DIV>

<!-- PAGEBREAK -->
<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="center" style="font-size: 10pt; margin-top: 18pt">Waste Management Retirement Savings Plan
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 6pt">Notes to Financial Statements (continued)
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>6. Reconciliation of Financial Statements to Form&nbsp;5500</B>
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The following is a reconciliation of net assets available for benefits per the financial statements
to the Form&nbsp;5500 as of December&nbsp;31, 2006 and 2005:
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="76%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2006</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="2" style="border-bottom: 1px solid #000000">2005</TD>
    <TD>&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Net assets available for benefits per the financial statements</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,373,267,048</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,208,005,412</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Less- Amounts pending distribution to participants</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(906,280</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(784,276</TD>
    <TD nowrap>)</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Less- Adjustment from fair value to contract value for
fully benefit-responsive investment contracts</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(2,533,056</TD>
    <TD nowrap>)</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">&#151;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Net assets available for benefits per the Form&nbsp;5500</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,369,827,712</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">1,207,221,136</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The following is a reconciliation of the net increase in net assets available for benefits per
the financial statements to the Form&nbsp;5500 for the year ended December&nbsp;31, 2006:
</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="88%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Net increase in net assets available for benefits per the financial statements</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">165,261,636</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Add &#151; Amounts pending distribution to participants at December&nbsp;31, 2005</DIV></TD>
    <TD>&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="right">784,276</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Less &#151; Amounts pending distribution to participants at December&nbsp;31, 2006</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(906,280</TD>
    <TD nowrap>)</TD>
</TR>
<TR valign="bottom">
    <TD><DIV style="margin-left:30px; text-indent:-15px">Less &#151; Adjustment from fair value to contract value for fully benefit-
responsive investment contracts</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="left">&nbsp;</TD>
    <TD align="right">(2,533,056</TD>
    <TD nowrap>)</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD nowrap colspan="2" align="right" style="border-top: 1px solid #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<TR valign="bottom" style="background: #cceeff">
    <TD><DIV style="margin-left:15px; text-indent:-15px">Net increase
in net assets available for benefits per the Form&nbsp;5500</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left">$</TD>
    <TD align="right">162,606,576</TD>
    <TD>&nbsp;</TD>
</TR>
<TR style="font-size: 1px">
    <TD><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
        <TD nowrap colspan="2" align="right" style="border-top: 3px double #000000">&nbsp;</TD>
    <TD>&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Amounts pending distribution are recorded as benefits paid to participants on the Form&nbsp;5500
for benefit claims that have been processed and approved for payment prior to December&nbsp;31, but
which have not yet been paid as of that date.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The accompanying financial statements present fully benefit-responsive investment contracts at
contract value. The Form&nbsp;5500 requires fully benefit-responsive investment contracts to be reported
at fair value. Therefore, the adjustment from fair value to contract value for fully
benefit-responsive investment contracts represents a reconciling item. The 2005 Form&nbsp;5500 presented
this fully benefit-responsive investment contract at contract value and will not be amended.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>7. Plan Termination</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Although it has not expressed any intention to do so, the Company has the right to discontinue its
Plan contribution at any time and to terminate the Plan subject to the provisions of ERISA.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->14<!-- /Folio -->
</DIV>

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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">Waste Management Retirement Savings Plan

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">Notes to Financial Statements (continued)

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>8. Commitments and Contingencies</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">In April&nbsp;2002, a lawsuit was filed against the Plan (as successor to the savings plan sponsored by
Waste Management Holdings), Waste Management Holdings, and certain fiduciaries of the
savings plan sponsored by Waste Management Holdings and of the Plan (&#147;Plan Defendants&#148;) in the
United States District Court for the District of Columbia (the &#147;D.C. Case&#148;). After first asserting
broader claims as to the Plan, the plaintiffs in the D.C. Case now purport to file their complaint
against Plan Defendants on behalf of those Plan participants for whose account the Plan&#146;s
fiduciaries acquired Waste Management Holdings common stock between January&nbsp;1990 and February&nbsp;24,
1998, the date of the restatement of previously issued financial statements by Waste Management
Holdings. The plaintiffs in the D.C. Case allege that the prices at which the Plan purchased the
stock were artificially inflated by omissions of a material nature about Waste Management Holdings&#146;
financial condition and that the stock of Waste Management Holdings should not have been an
investment option. The plaintiffs in the D.C. Case also allege that certain of the defendants
breached a variety of ERISA requirements by, among other things, electing to participate in the
Illinois securities class action settlement related to a time frame ending February&nbsp;24, 1998,
rather than opting out of the settlements to assert distinct ERISA claims that did not apply to
other members of the settlement class.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The Illinois securities class action arose from Waste Management Holdings&#146; February&nbsp;1998
restatement of prior period earnings and charge to fourth quarter 1997 earnings. The parties to
the Illinois securities class action agreed to a settlement that became final in 1999 (the
&#147;Illinois Settlement&#148;). The Plan participated in the settlement class and, in 2000, a share of the
settlement proceeds was placed into the trust of the Plan and allocated to the appropriate
participants&#146; account balances.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">The defendants in the D.C. Case assert that most, if not all, of the plaintiffs&#146; causes of action
have been released as a result of the Illinois Settlement or are time-barred. The defendants have
filed a motion to dismiss the plaintiffs&#146; amended complaint. The outcome of this lawsuit cannot be
predicted with certainty, and these matters could impact the Plan&#146;s net assets available for
benefits. The Plan and the other defendants intend to defend themselves vigorously in this
litigation.
</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>9. Related Party Transactions</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Certain investments of the Plan are managed by State Street. State Street is the trustee of the
Plan and, therefore, these transactions qualify as party-in-interest transactions. Additionally, a
portion of the Plan&#146;s assets are invested in the Company&#146;s common stock. Because the Company is the
Plan Sponsor, transactions involving the Company&#146;s common stock qualify as party-in-interest
transactions. All of these transactions are exempt from the prohibited transactions rules.
</DIV>

<P align="center" style="font-size: 10pt"><!-- Folio -->15<!-- /Folio -->
</DIV>

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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">Waste Management Retirement Savings Plan

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">Notes to Financial Statements (continued)

</DIV>

<DIV align="left" style="font-size: 10pt; margin-top: 12pt"><B>10. New Accounting Pronouncement</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">In September&nbsp;2006, the FASB issued Statement of Financial Accounting Standards No.&nbsp;157, <I>Fair Value
Measurements </I>(&#147;SFAS No.&nbsp;157&#148;), which defines fair value, establishes a framework for measuring
fair value and expands disclosures about fair value measurements. SFAS No.&nbsp;157 is effective for the
Plan beginning January&nbsp;1, 2008. Management is currently evaluating the impact, if any, the adoption
of SFAS No.&nbsp;157 will have on the financial statements of the Plan.
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->16<!-- /Folio -->
</DIV>

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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">



<DIV align="left">
<A name="111"></A>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>Supplemental Schedule</B>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->&nbsp;<!-- /Folio -->
</DIV>

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<P><HR noshade><P>
<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">




<DIV align="center" style="font-size: 10pt; margin-top: 18pt">Waste Management Retirement Savings Plan
</DIV>

<DIV align="left">
<A name="112"></A>
</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">Schedule&nbsp;H, Line 4(i) &#150; Schedule of Assets (Held At End of Year)

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">EIN: 73-1309529 PN: 001

</DIV>

<DIV align="Center" style="font-size: 10pt; margin-top: 6pt">December&nbsp;31, 2006

</DIV>
<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="33%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="20%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="7%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="8%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="center"><B>Identity of Issue</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Description of Investment</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" colspan="3"><B>Current Value</B></TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR style="font-size: 1px">
    <TD colspan="9" align="left" style="border-top: 1px solid #000000">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center"><DIV style="margin-left:15px; text-indent:-15px">*Participant Loans</DIV></TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="center">Various maturity dates with</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top">$</TD>
    <TD align="right" valign="top">56,849,075</TD>
    <TD valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center"><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="center">interest rates ranging from</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD align="center"><DIV style="margin-left:15px; text-indent:-15px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="center">5.0% to 11.0%</TD>
    <TD>&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD align="right" valign="top">&nbsp;</TD>
    <TD valign="top">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>



<DIV align="left">
<DIV style="font-size: 3pt; margin-top: 16pt; width: 18%; border-top: 1px solid #000000">&nbsp;</DIV>
</DIV>

<TABLE width="100%" border="0" cellpadding="0" cellspacing="0" style="font-size: 10pt">
<TR>
    <TD width="3%"></TD>
    <TD width="1%"></TD>
    <TD width="96"></TD>
</TR>

<TR valign="top">
    <TD nowrap align="left">*</TD>
    <TD>&nbsp;</TD>
    <TD>Party-in-interest</TD>
</TR>

</TABLE>



<P align="center" style="font-size: 10pt"><!-- Folio -->17<!-- /Folio -->
</DIV>

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<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="left">
<A name="115"></A>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>SIGNATURES</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt"><I>The
Plan.</I> Pursuant to the requirements of the Securities Exchange Act of
1934, the Administrative Committee has duly caused this annual report to be signed on its behalf by
the undersigned hereunto duly authorized.
</DIV>
<DIV align="center" style="margin-top: 18pt">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="55%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="35%">&nbsp;</TD>
    <TD width="1%">&nbsp;</TD>
    <TD width="6%">&nbsp;</TD>
</TR>
<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD colspan="3" valign="top" align="left">WASTE MANAGEMENT RETIREMENT SAVINGS PLAN</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">Date: June&nbsp;28, 2007&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">By:
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">/s/ Krista DelSota
<DIV style="font-size: 1pt; border-top: 1px solid #000000">&nbsp;</DIV>
Krista DelSota
</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Vice President, Compensation and Benefits</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Waste Management, Inc.</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom"><!-- Blank Space -->
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Member, Administrative Committee of the</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">&nbsp;
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Waste Management Employee Benefit Plans</TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">&nbsp;</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->18<!-- /Folio -->
</DIV>

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<DIV style="font-family: 'Times New Roman',Times,serif">
<DIV align="left">
<A name="116"></A>
</DIV>

<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>INDEX TO EXHIBITS</B>
</DIV>

<DIV align="center">
<TABLE style="font-size: 10pt" cellspacing="0" border="0" cellpadding="0" width="100%">
<!-- Begin Table Head -->
<TR valign="bottom">
    <TD width="8%">&nbsp;</TD>
    <TD width="5%">&nbsp;</TD>
    <TD width="87%">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left"><B>Exhibit</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center">&nbsp;</TD>
</TR>
<TR style="font-size: 8pt" valign="bottom">
    <TD nowrap align="left" style="border-bottom: 1px solid #000000"><B>Number</B></TD>
    <TD>&nbsp;</TD>
    <TD nowrap align="center" style="border-bottom: 1px solid #000000"><B>Description</B></TD>
</TR>
<TR style="font-size: 8pt">
    <TD>&nbsp;</TD>
</TR>

<!-- End Table Head -->
<!-- Begin Table Body -->
<TR valign="bottom">
    <TD valign="top"><DIV style="margin-left:0px; text-indent:-0px">23.1
</DIV></TD>
    <TD>&nbsp;</TD>
    <TD align="left" valign="top">Consent of Independent Registered Public Accounting Firm</TD>
</TR>
<!-- End Table Body -->
</TABLE>
</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio -->19<!-- /Folio -->
</DIV>

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</DOCUMENT>
<DOCUMENT>
<TYPE>EX-23.1
<SEQUENCE>2
<FILENAME>h47873bexv23w1.htm
<DESCRIPTION>CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
<TEXT>
<HTML>
<HEAD>
<TITLE>exv23w1</TITLE>
</HEAD>
<BODY bgcolor="#FFFFFF">
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<H5 align="left" style="page-break-before:always">&nbsp;</H5><P>

<DIV style="font-family: 'Times New Roman',Times,serif">

<DIV align="right" style="font-size: 10pt; margin-top: 12pt"><B>Exhibit&nbsp;23.1</B>
</DIV>


<DIV align="center" style="font-size: 10pt; margin-top: 18pt"><B>CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM</B>
</DIV>


<DIV align="left" style="font-size: 10pt; margin-top: 6pt">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;We consent to the incorporation by reference in the Registration Statement (Form S-8 No.
333-45062) pertaining to the Waste Management Retirement Savings Plan of our report dated June&nbsp;27,
2007, with respect to the financial statements and schedule of the Waste Management Retirement
Savings Plan included in this Annual Report (Form 11-K) for the year ended December&nbsp;31, 2006.
</DIV>
<DIV align="right" style="font-size: 10pt; margin-top: 6pt">/s/ Ernst &#038; Young LLP&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</div>

<DIV align="left" style="font-size: 10pt; margin-top: 6pt">Houston, Texas<BR>
June&nbsp;27, 2007

</DIV>


<P align="center" style="font-size: 10pt"><!-- Folio --><!-- /Folio -->
</DIV>

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