Specifications include, but are not limited to: The purpose of this RFP is to obtain proposals from potential qualified contractors with technical expertise and experience in nitrogen oxides (NOx) emissions control technologies to conduct a review of SCAQMD staff’s Best Available Retrofit Control Technology (BARCT) technology assessment and cost estimates. The BARCT technology assessment will focus on NOx emission reduction technologies for the following stationary equipment at refineries: Fluid catalytic cracking units, Sulfur recovery and tail gas treatment units (SRU), Non-SRU incinerators (flares, thermal oxidizers, and afterburners), Boilers and heaters (refineries and hydrogen plants), Gas turbines/duct burners, Primary internal combustion engines, Coke calciner