(1) The department may increase the total adjusted penalty, as calculated under ARM 17.4.305, by an amount based upon the violator's economic benefit. The department shall base any penalty increase for economic benefit on the department's estimate of the costs of compliance, based upon the best information reasonably available at the time it calculates a penalty under these rules. The economic benefit must be added to the total adjusted penalty calculated under ARM 17.4.305 to obtain the total penalty.