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Utility's Innovation Keeps New Mains Cleaner
Author(s) -
Korntreger Cershon,
O'Donnell Linda
Publication year - 1998
Publication title -
opflow
Language(s) - English
Resource type - Journals
eISSN - 1551-8701
pISSN - 0149-8029
DOI - 10.1002/j.1551-8701.1998.tb02141.x
Subject(s) - mains electricity , dirt , flushing , debris , environmental science , trench , waste management , environmental engineering , water tanks , water supply , water resource management , engineering , geology , materials science , voltage , electrical engineering , mechanical engineering , medicine , oceanography , layer (electronics) , endocrinology , composite material
Contractors for the city of Philadelphia often fail sanitary release tests after laying new water mains because pipes are delivered uncapped to construction sites. High turbidities, high heterotrophic plate counts, and coliforms can result when water mains are contaminated by dirt, mud, debris, or dirty water, either before or after the pipe is placed in the trench. This article describes how the Philadelphia water department developed caps for the water industry that provide an alternative to excessive flushing and excessive chlorine dosages in maintaining sanitary construction practices.