Clean Harbors, Inc. (CLH) has had an impressive run over the past three months. The stock has gained 15.4% against the 0.3% decline of the industry it belongs to and the 5.1% rally of the Zacks S&P 500 composite. Reasons Behind the Rally Clean Harbors has an impressive earnings surprise history. The company’s earnings surpassed the Zacks Consensus Estimate in three of the trailing four quarters and missed once, delivering an average surprise of 0.7%. Being a leading provider of environmental and industrial ...