EXHIBIT 11.1 EMCON COMPUTATION OF INCOME PER SHARE (In thousands except per share data) Three months ended March 31, 1997 1996 ---- ---- Net income ............................................................................... $ 691 $ 34 Proforma interest income related to modified treasury stock method .................................................................. N/A 48 ------ ------ Adjusted net income ...................................................................... $ 691 $ 82 ====== ====== Weighted average number of common shares outstanding during the period ........................................................... 8,535 8,457 Common and common equivalent shares outstanding for the purpose of calculating primary net income per share ............................. 8,472 N/A Common equivalent shares from outstanding stock options using the modified treasury stock method ............................................................................ N/A 959 Incremental shares to reflect full dilution (1) .......................................... 0 0 ------ ------ Total shares for purposes of calculating diluted income per share (1) .................................................................... 8,472 9,416 ====== ====== Primary income per share ................................................................. $ 0.08 $ 0.01 ====== ====== Fully diluted income per share ........................................................... $ 0.08 $ 0.01 ====== ====== - ----------------------- (1) This calculation is submitted in accordance with Regulation S-K Item 601(b)(11) although not required by footnote 2 to paragraph 14 to APB opinion No. 15, because it results in dilution of less than 3%. 127