Last week’s Chemical Valley incidents were being reviewed today. Shell Canada had two problems. The company issued a CVECO information code Thursday night when crude oil was found leaking from a storage tank at the refinery. Then Friday afternoon, a Code-6 alert was sounded due to odour concerns following a sour water release. That prompted activation of the St Clair Township Alert-FM system, community warning sirens, traffic control and a shelter-in-place order immediately north of Shell. St Clair Township and Sarnia first responders and emergency planners are studying the incidents and the response today.