WMD-Collection System Maintenance (CSM) performs preventive maintenance of over 1,500 miles of sewer, over 23,000 manholes and 15 sewer lift stations. Sewer lines ranges from 6” to 84” in diameter and some of them are over 75 years old. Current sewer pipes are made of polyvinyl chloride (PVC). However 50% of existing pipes are made of vitrified clay (VCP).
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