The Cummings Foundation of Woburn has awarded separate $100,000 grants to the Medford Boys & Girls Club and to the city for the proposed Krystle Campbell Peace Garden. Each grant was awarded as part of the foundation’s $100k for 100 program, which awards $10 million annually to nonprofits in Greater Boston. The club, based at Gene Mack Gym at the Chevalier Auditorium complex, will use its grant to expand staffing and accommodate 30 more club members. The club serves youths ages 6 to 14 with after-school activities. The peace garden will honor the memory of Campbell, one of four victims killed in the Boston Marathon bombings. She grew up in Medford. The memorial, planned for Clippership Drive, will also honor victims Martin Richard, Lingzu Lu, and MIT police Officer Sean Collier.