Exhibit 99.15 (Text of graph posted to Ashland Inc.'s website concerning U.S. Gulf Coast Asphalt Barge Prices) ARGUS ASPHALT REPORT ((C), 2004 ARGUS MEDIA) U.S. GULF COAST ASPHALT BARGE PRICES* SOURCE: Argus Media Information concerning Argus may be accessed at www.argusonline.com. Ashland makes no warranties or representations concerning any information posted or distributed by Argus, including without limitation information contained on its website. Argus Asphalt Report U.S. Gulf Coast Asphalt Barge Prices ($, per Ton) 2000 2001 2002 2003 2004 2005 '00-'04 Avg by Month Jan 102.06 71.69 73.31 144.31 113.69 106.55 101.01 Feb 116.56 64.25 91.69 167.00 111.65 110.13 110.23 March 130.60 68.50 102.50 156.25 116.06 115.75 114.78 April 135.13 72.13 120.75 138.75 125.69 134.88 118.49 May 132.19 78.88 139.75 120.20 142.35 148.63 122.67 June 128.95 87.44 145.75 121.38 155.25 155.75 127.75 July 126.19 94.75 131.63 121.50 156.88 166.25 126.19 August 119.65 102.35 122.56 126.75 154.40 125.14 Sept 115.88 106.42 117.63 128.81 153.50 124.45 Oct 102.17 100.44 114.44 127.19 145.44 117.94 Nov 91.00 86.25 98.75 118.50 126.60 104.22 Dec 84.83 69.00 94.58 115.00 110.69 94.82 Annual Avg. 115.43 83.51 112.78 132.14 134.35 133.99 115.64 *Argus Asphalt Report monthly liquid asphalt barge price averages for East and West Gulf Coast f.o.b. refinery sources. Prices represent non-polymerized AC-20 or PG 64-22 grade asphalt.