A summary of selected City Hall actions this past week affecting Central Los Angeles. : CITY COUNCIL

* PLANNING STUDY: Approved a proposal by Councilman Mike Hernandez to participate in a pilot project with UCLA to determine the effect of planning decisions on inner-city neighborhoods. The program will focus on Pico-Union. The city will purchase $175,000 in computer equipment for the project.

* CELEBRITY AUCTION: Approved the closure of Olive Street between Olympic Boulevard and 11th Street and Olympic Boulevard between Grand Avenue and Olive Street from 6 a.m. to 6 p.m. Oct. 3 for a celebrity auction and concert to benefit the Los Angeles Mission. City fees of $2,510 will be waived.

* LA SINFONICA ORCHESTRA: Councilman Mike Hernandez requested that $500 in public-service funds from his 1st Council District be given to assist La Sinfonica del Barrio, an orchestra composed of youths.

* APPOINTMENT: Approved Los Angeles school board member Barbara Boudreaux of West Adams as a member of the board of the Los Angeles Convention Center Commission.

HOW THEY VOTED

How South-Central and Eastside City Council representatives voted on selected issues.

* AIDS: Approved a proposal by Councilwoman Jackie Goldberg urging Gov. Pete Wilson to sign a bill passed by the Legislature that would establish programs allowing drug addicts to exchange dirty needles for clean ones to reduce the spread of AIDS. Passed: 12-1. Voting yes: Hernandez, Goldberg, Nate Holden, Mark Ridley-Thomas and Rita Walters. Voting no: Rudy Svorinich Jr. Absent: Richard Alatorre.

* SCIENCE AND MATH: Requested a $100,000 grant from the National Science Foundation to develop a plan to improve mathematics and science education in the Los Angeles Unified School District. Focus will be on five high schools, including Dorsey, Manual Arts and Roosevelt. Passed: 10-0. Voting yes: Hernandez, Goldberg, Holden, Svorinich, Ridley-Thomas and Walters. Absent: Alatorre.

* MINORITY BUSINESSES: Approved an application requesting $135,000 from the federal government to start a Minority Business Opportunity Committee Program. The program aims to increase opportunities for minority businesses, in part by providing greater access to financing, management, contracts and markets. Passed: 13-0. Voting yes: Goldberg, Hernandez, Holden, Svorinich, Ridley-Thomas and Walters. Absent: Alatorre.