Project Profile: Alexandria Wastewater Treatment Plant Enriched Nitrogen Removal Basic Information Owner: Alexandria Sewer Authority Engineer: CH2M Hill Approximate Contract Value: $2,300,000 Completion Date: April 2008 Project Type: Wastewater Treatment Plant Upgrade Testimonials "American Contracting & Environmental has provided quality workmanship and excellent project management on three Alexandria Sanitation Authority (ASA) projects."   "It has been a pleasure to work with a quality contractor and we look forward to having American Contracting & Environmental bidding on more work with ASA." read more...   - Alexandria Sanitation Authority Project Description American Contracting provided modifications to five biological reactor basins for enhanced nitrogen removal including adding KSB submersible mixers, modification to methanol feed pip-ing, replacement of the ceramic diffusers and replacement of the gravity thickener and feed piping system. Project highlights include: Modification to five biological reactor basins for enhanced nitrogen removal Replacement of over 15,000 ceramic diffusers Installation of 30 each KSB submersible mixers Modifications to methanol feed piping Replacement of the existing gravity thickener suction and feed piping system with new piping Integration into plant control system