In the model, the initial concentration in row 16, column 16 is 100 but at all other locations is set to 0. This is specified in the data set Initial_Concentration_Chem (if the species name is "Chem"). The default formula for this data set is zero so it does not need to be changed. To set the initial concentration at row 16, column 16 create a point object in that cell and use it to set the value of Initial_Concentration_Chem to 100.
