Rehabilitation Manholes. Under certain circumstances total structural degradation of pre-cast manholes can occur in less than 5 years. Instead of continuing to patch perpetually corroding concrete, ...

Fiberglass Manholes. While the ultimate life span of a fiberglass manhole would be dependent on the types of chemicals present in either the ground water or the wastewater, it is possible to state ...

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The Napa Sanitation District wants at least some local manhole covers to have a bit of flair — and to clearly identify the agency. It wants to put its distinctive stamps on those round metal ...