In July and August 2007, National Physical Laboratory (NPL) conducted emissions tests for numerous difficult to measure emission sources at a BP petroleum refinery in Texas City, Texas, using NPL's differential absorption LIDAR (DIAL) system. The testing was sponsored by and conducted for the Texas Commission on Environmental Quality (TCEQ) with funding provided by both TCEQ and the U.S. Environmental Protection Agency. The purpose of this report is to summarize the DIAL results, compare the DIAL results with estimates developed using standard accepted procedures and conditions that existed when the DIAL tests were conducted, compare the DIAL results with average ozone-season emission rates reported in BP's 2007 emissions inventory, and assess why DIAL results differ from estimates. Section 2 of this report addresses emissions from external floating roof tanks and vertical fixed roof tanks storing a variety of materials. Sections 3, 4, and 5 address emissions from wastewater sources, flares, and delayed cokers, respectively. Recommendations for future testing and references are presented in sections 6 and 7, respectively.

EPA project officer: Brenda Shine, Work Assignment Manager, Sector Policies and Programs Division. Contract No. Work Assignment No. "November 2010." "EPA 453/R-10-002." "PB2011-104495."