<p>A joint Environmental Impact Report (EIR)/Environmental Impact Study (EIS) was prepared for the Rio del Oro Specific Plan, a mixed-use development on 3,800 acres in eastern Sacramento County. The plan area is located within the Aerojet property, formerly used for solid rocket fuel testing. The development would include construction for more than 11,000 residential units, commercial mixed-use areas, a large community park as well as neighborhood parks and open spaces, and a proposed 507-acre wetland preserve. The project included development and quality assurance review of the greenhouse gas (GHG) analysis in the EIR/EIS for the Rio Del Oro development. The quantitative GHG inventory and analysis conducted for the EIR/EIS was the first major land development GHG analysis to be released to the public in northern California. The increase in traffic trips and vehicle miles traveled were the primary sources of GHG emissions. Following determination of a significant impact, GHG-reduction mitigation measures were recommended for consideration by the City Council.</p>