"MOUSA is undertaking this project to replace previously existing tanks and to address post-Katrina storage capacity shortages. The use of domed internal floating roofs on Tanks 80-9 and 80-10A, as well as an internal floating roof on Tank 1-3A, will result in significant reductions in VOC emissions versus the previously existing tanks. The construction of Tank 80-5A will enable tank farm changes to accommodate the future BenFree Unit, which must be built and operational by January, 2010 to satisfy the Mobile Source Air Toxics rule." (emphasis added)
Murphy Oil's Meraux refinery looms over our little residential neighborhoods and simple compliance with the existing emission limits agreed to when applied for will result in immediate and significant improvements to the quality of life and air quality in Meraux and Chalmette.
"Since Tank 200-7 is a group 2 tank, it does not currently have any controls." As with all of Murphy Oil's storage tanks, residents have previously requested independent monitoring of VOC releases to protect public health and continued compliance assurance measures to guarantee Murphy Oil's emissions are within the existing permitted levels.
VOC emissions from Tank 200-7 were listed at nearly 500 times the permitted amounts (page 286 EDMS document # 38894488), however, as Murphy reports in its response (page 297 EDMS document #38894488) " the emissions estimates provided in the March 2008 notification were conservative high estimates and that subsequent investigation indicates that the emissions are much lower."
Murphy Oil is continuing its review, however any changes to storage tank controls or processing improvements may not be implemented until mid 2009 or later. Murphy Oil "is also investigating control methods" for the heavy oil storage tank and the feasibility of processing changes for the No. 6 Fuel Oil stream. "Current efforts are focused at improving operations to reduce the vapor pressure of the No. 6 Oil." "The higher vapor pressure results in higher estimated emissions. " (pages 297, 298 EDMS document # 38894488)
Murphy Oil has "indicated that the vapor pressure of the No. 6 Oil managed in Tank 200-7 and at the dock was greater than previously believed during the permitting of such units" and that at times its No. 6 Fuel Oil's vapor pressure exceeds the storage tank's permitted vapor pressure of less than 1.5 psia. (EDMS document # 36833563, dated March 4, 2008, EDMS document # 38894488, dated December 5, 2008 , page 286, 287)