Calvin Joseph (CJ) Spencer, 2 years old and Dylan Spencer 4 years old lends a hand to their grandmother, Mary Spencer, District Deputy Chief of the Small Business Program. Volunteers from the U.S. Army Corps of Engineers Los Angeles District joined forces with hundreds of community volunteers along the Los Angeles River adjacent to Balboa Park in the Sepulveda Basin for the Friends of the Los Angeles River’s 25th La Gran Limpieza: The Great Los Angeles River Clean Up April 26.