Firefighter Jeff Rock of the Salt Lake City Fire Department's haz-ardous materials team stands ankle deep in a portion of a 30,000-gallon puddle of milk at the Meadow Gold processing plant, 3730 W. 1820 South. A cap popped off a milk silo at the plant about 9:30 a.m. Friday, turning most of the plant's parking lot into a lake of raw milk. An employee at the plant was hit by the cap but was not injured, said Salt Lake City Fire Capt. Devin Villa. Fire crews used pumps to clean up the mess, diverting the spilled milk into another storage tank. Meadow Gold will dispose of the ruined milk. Villa said investigators haven't determined what caused the cap to pop. Plant crews were able to stop the leak before the entire silo was emptied.