A former rocket testing and development site in Canoga Park is under increased scrutiny after recent tests showed high levels of two toxic chemicals in surrounding homes and businesses. The report, delivered on behalf of RTX Corp. to the California State Water Resources Control Board in June, detailed soil vapor and groundwater inspections at seven locations near the now vacant lot that was once home to the Rocketdyne testing and development site. It is adjacent to the Westfield Topanga mall. At each of the seven locations, the tests recorded levels of toxic cleaning solvents that were above environmental screening levels that could pose a long-term threat to human health and the environment.