{"operation":"document","citation":"CPF 320071010W","title":"NORTHERN NATURAL GAS CO — Warning Letter","source_type":"enforcement","agency":"Pipeline and Hazardous Materials Safety Administration","status":"historical","official":true,"published_on":"2007-05-21","effective_on":null,"summary":"CLOSED warning letter citing 191.7.","machine_formats":{"json":"https://regulus.evalyn.ai/document/phmsa-enforcement-320071010w.json","markdown":"https://regulus.evalyn.ai/document/phmsa-enforcement-320071010w.md"},"app_url":"https://regulus.evalyn.ai/document/phmsa-enforcement-320071010w","source_url":"https://primis.phmsa.dot.gov/enforcement-data/case/320071010W","body":"Warning Letter involving NORTHERN NATURAL GAS CO. PHMSA's enforcement data identifies the cited regulation as 191.7. The case was opened on 2007-05-21 and is reported as closed as of 2007-05-21. Open the official case record for notices, responses, orders, and the latest status.\n\nOfficial case documents:\n\n320071010W_operator response to warning letter_06052007.pdf: https://primis.phmsa.dot.gov/enforcement-documents/320071010W/320071010W_operator%20response%20to%20warning%20letter_06052007.pdf","truncated":false,"body_characters":497}