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              [html]<thead><tr><td></td><td>003 and 2002 :</td><td>Balance as of December 31.2001</td><td>New Expansions Undertaken</td><td>Landfills Acquired, Net of Divestitures</td><td>Permits Granted, Net of Closures</td><td>Airspace Consumed</td><td>Changes in Engineering Estimates</td><td>Changes in Design</td></tr><tr><td></td><td>Balance as of December 31.2002</td><td>Permitted airspace :</td><td>Cubic yards ( in millions )</td><td>1.329.0</td><td>—</td><td>4.9</td><td>45.1</td><td>( 34.6 )</td></tr></thead><tbody><tr><tdcolspan="9">13.1</td></tr><tr><td>. 4</td><td>1.357.9</td><td>Number of sites.......</td><td>54</td><td>1</td><td>1</td><td>56</td><td>Expansion airspace :</td><td>Cubic yards ( in millions )</td></tr><tr><td>359.6</td><td>4.3</td><td></td><td>—</td><td>( 35.7 )</td><td></td><td></td><td></td><td>—</td></tr><tr><tdcolspan="9">( 2.1 )</td></tr><tr><td>27.2</td><td>353.3</td><td>Number of sites.......</td><td>20</td><td>2</td><td>—</td><td>( 2 )</td><td>_</td><td>_</td></tr><tr><td>___20</td><td>Total available airspace :</td><td>Cubic yards ( in millions )</td><td>1.688.6</td><td>4.3</td><td></td><td></td><td></td><td>4.9</td></tr><tr><tdcolspan="9">9.4</td></tr><tr><td>< underline >( 34.6 )</ underline ></td><td>11.0</td><td>27.6</td><td>1.711.2</td><td>Number of sites</td><td>___54</td><td>Table</td><td>__1</td><td>1</td></tr><tr><td>56</td><td>Balance as of December 31.2002</td><td>New Expansions Undertaken</td><td>Landfills Acquired, Net of Direstitures</td><td>Permits Granted, Net of Closures</td><td>Airspace Consumed</td><td>Changes in Engineering Estimates</td><td>Changes In Design</td><td>Balance as of December 31.2003</td></tr><tr><tdcolspan="9">Permitted airspace :</td></tr><tr><td>Cubic yards ( in millions )</td><td>1.357.9</td><td>—</td><td>26.3</td><td>154.6</td><td>( 39.3 )</td><td>(. 9 )</td><td>—</td><td>1.498.6</td></tr><tr><td>Number of sites</td><td>56</td><td></td><td>2</td><td>—</td><td></td><td></td><td></td><td>58</td></tr><tr><tdcolspan="9">Expansion airspace :</td></tr><tr><td>Cubic yards ( in millions )</td><td>353.3</td><td>61.6</td><td>—</td><td>( 154.1 )</td><td>—</td><td>( 3.5 )</td><td>11.4</td><td>268.7</td></tr><tr><td>Number of sites</td><td>20</td><td>—</td><td>—</td><td>( 5 )</td><td>_</td><td>________________________________________________________________________________________________________________________________________________________________________________________________________</td><td>15</td><td>Total available airspace :</td></tr><tr><tdcolspan="9">Cubic yards ( in millions )</td></tr><tr><td>1.711.2</td><td>61.6</td><td>26.3</td><td>_5</td><td>( 39.3 )</td><td>( 4.4 )</td><td>11.4</td><td>1.767.3</td><td>Number of sites</td></tr><tr><td>56 mm</td><td>2 months</td><td>—</td><td>58 mm</td><td>Balance as of December 31.2003</td><td>Landfills Acquired, Net of Direstitures</td><td>Permits Granted, Net of Closures</td><td>Airspace Consumed</td><td>Changes in Engineering Estimates</td></tr><tr><td>Changes In Design</td><td>Balance as of December 31.2004</td><td></td><td>Permitted airspace :</td><td>Cubic yards ( in millions )</td><td></td><td></td><td></td><td>1.498.6</td></tr><tr><tdcolspan="9">24.4</td></tr><tr><td>48.6</td><td>( 42.1 )</td><td>. 1</td><td>—</td><td>1.529.6</td><td>Number of sites</td><td>58</td><td>1</td><td>( 1 )</td></tr><tr><td>58</td><td>Expansion airspace :</td><td>Cubic yards ( in millions )</td><td>268.7</td><td>—</td><td></td><td></td><td></td><td>( 48.6 )</td></tr><tr><tdcolspan="9">—</td></tr><tr><td>. 1</td><td>2.0</td><td>222.2</td><td>Number of sites</td><td>15</td><td>—</td><td>( 3 )</td><td>_</td><td>_</td></tr><tr><td>___</td><td>12</td><td>Total available airspace :</td><td>Cubic yards ( in millions )</td><td>1.767.3</td><td></td><td></td><td></td><td>24.4</td></tr><tr><tdcolspan="9">—</td></tr><tr><td>( 42.1 )</td><td>− 2</td><td>2.0</td><td>1.751.8</td><td>Number of sites</td><td>58</td><td>1</td><td>( 1 )</td><td>58</td></tr><tr><td></td><td></td><td></td></tr><tr><tdcolspan="9"</tr><tr></tr><tr><td></td><td></td><td></td></tr></tbody>
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