September 20, 2006 City Awards Zelen two Contracts Zelen to do Environmental work for the City of Tucson The City of Tucson has awarded Zelen with its annual Environmental Remediation Systems-General Operation, Maintenance and Repair Services. Zelen will be maintaining the Cities cache of remediation systems throughout the City for the next year. In addition, the City awarded Zelen with Groundwater and Soil Vapor Sampling and Environmental Well Services Contract. Details