Updates

Latest Version: 9.09

Upgrade Cost: If you purchased version 9 of the program this upgrade is free. Customers who purchased earlier versions can purchase this upgrade for $300.00 US.

Revisions in Version 9.09

• The performance of the program for multiple landfills (or other sources) has been improved by reducing the amount of integration required. In this version the step size and number of steps in the Gauss integration can be changed using the Select option.
• When the Select option is specified the number of integration groups (up to 10) and the number of samples per group can be entered. After this the step size and number of steps for each group can be entered.
• A problem with time-varying concentration history has been fixed. Previously, changes in the source concentration were being ignored when there was only one landfill (with two or more landfills these changed were accepted properly). This bug has been corrected in this version.
• Previously no checks were done to ensure that no more than 50 time groups were entered. This check is now performed.
• To prevent unauthorized copying, software locks were used in previous versions. These locks caused many problems with users, and were difficult to support. In this version, the software security is imposed by encrypting the user's name in the software.

Revisions in Versions 9.07 and 9.08

• The use of the initial source concentration for time-varying properties and more than one landfill has been corrected. In previous versions the initial source concentration entered in the time-varying option was not being used correctly, and if a -1 was entered to indicate the use of the previous concentration the -1 was being interpreted as the new concentration.
• The option of forcing negative concentrations to zero has been added. This option can be selected in the Execute dialog box. It is used to change all negative concentrations that are calculated as a result of insufficient integration to zero. The option should be used with caution, since it may make it more difficult to determine if adequate integration has been achieved.