Water quality at the Hood River Waterfront Park Beach is back to safe parameters.  An E. Coli advisory at that location was lifted late Friday afternoon, and all signs with that advisory have been removed.  Columbia Riverkeeper, which conducts weekly monitoring for bacterial contamination at five recreational sites in the Gorge, had reported E. Coli levels beyond federal water quality standards during the middle of last week.  Tests do indicate E. Coli is in the water most of the year, so the Hood River County Public Health officials continue to urge people who frequent the park to use caution if entering the water.  Children, the elderly, and people with immune deficiencies are most at risk of illnesses after exposure to contaminated water and should always avoid ingesting the water.  None of the other recreational sites that are tested for water quality in the Gorge were affected by the advisory.