(Vancouver, WA)  --  Officials are confirming four more coronavirus cases among workers at a food processing plant in Vancouver.  Clark County Public Health reports 69 employees at Firestone Pacific Foods have now tested positive for COVID-19.  Another 15 close contacts of those employees have also tested positive for the virus.  The plant halted its operations last Tuesday after the outbreak emerged.  The company says it hopes to resume production at the facility this Thursday, pending approval from county health officials.