State officials announced Friday they have begun testing seafood from the Tangipahoa River and Lake Pontchartrain to look for potential contamination after the explosion and fire at the Smitty’s Supply Inc. facility last month. Officials are collecting samples from various locations and analyzing them for heavy metals – such as arsenic, chromium, barium and lead – and petroleum-related hydrocarbons. Cleanup and decontamination efforts continue in Tangipahoa Parish nearly a month after petrochemical storage tanks exploded at the Smitty’s Supply facility in Roseland and caused a fire that burned for about two weeks. The explosion dispersed an oily residue onto neighboring homes, businesses and a nearby elementary school, while petrochemicals spilled into area waterways. An oil slick was visible on the surface of the Tangipahoa River, stretching roughly 45 miles south of the facility, LDEQ documents show.