When considering the purchase of manhole covers, it is important to consider he long term durability to get the most value. High-quality composite manhole systems have a life expectancy over 30 years and require little maintenance. Contrary to this, cast iron systems require a significant amount of maintenance and will not last a full 30 years. Replacement of these systems needs to be figured into the total cost when comparing the two options. While some may be concerned with the safety of using composite over cast iron, fully traffic rated covers can withstand weight 30% higher than the current weight…