EL CAJON — The San Diego County Board of Supervisors on Wednesday will consider approving the construction of a large distribution warehouse center in El Cajon. The proposed project will be on a plot of land zoned for industrial use located at the northwest corner of Cuyamaca Street and Weld Boulevard in El Cajon. The site is on open space that is behind and below a group of homes in Santee, where some residents have expressed concern about noise and traffic issues that will accompany the warehouse, which appears to be earmarked for Amazon. Although the county owns the land, El Cajon has land use authority. El Cajon City Manager Graham Mitchell said on Friday that city has not yet approved the project and is waiting for the developer to get clearance from the Federal Aviation Administration because of the site’s proximity to Gillespie Field.