EXHIBIT 10.1 AMENDMENT NO. 1 TO STOCKHOLDERS AGREEMENT THIS AMENDMENT NO. 1 TO STOCKHOLDERS AGREEMENT (this "Amendment") is made as of September 1, 1999 by Tenneco Packaging Inc., PCA Holdings, LLC and Packaging Corporation of America (the "Company")....Stockholders Agreement • November 12th, 1999 • Packaging Corp of America • Paperboard containers & boxes • Illinois
