Mechanic/Machinists in the Water/Wastewater industry share their experience Tom Hanlon, Maintenance Machinist, San Francisco Public Utilities Commission David Salazar, Maintenance Machinist, East Bay Municipal Utility District Danny Humrich, Maintenance Machinist, San Francisco Public Utilities Commission John Navarra, Maintenance Supervisor, City of San Jose Chris Nicoletti, Maintenance Mechanic, Union Sanitary District