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Choose language Did You Know. The prevalence of autism has increased by 289 in the last 12 years Donate Please help EL ARCA to fulfill its mission of empowering the developmentally disabled by making a donation NOW. Who We Are Since 1965 EL ARCA has provided essential services to the developmentally disabled population of Greater Los Angeles. Only with your support we will continue to maintain a compassionate loving environment where skills are improved and abilities are honed in order to bring about a better quality of life for our community and their families.