The Dalles Public Works Department will begin work on Monday (April 4) to replace a section of water main line and install a new fire hydrant on Trevitt Street between 7th Street and 9th Street.       Work is expected to take place from 7 a.m. to 3:30 p.m. weekdays next week.  After the lines are installed the street will be paved and opened back up to motorists as soon as possible.  For the duration of the project Trevitt Street will be closed from 7th to 9th Streets to all traffic, including emergency vehicles, with no parking allowed along either side of Trevitt in the immediate work area.   Motorists are encouraged to use Bridge and Garrison Streets as alternative routes to avoid the work area.  8th Street residents will need to use Bridge Street for access to their homes, as 8th Street will be closed at the intersection with Trevitt.