The San Geronimo Valley Community Center was awarded a $5,000 grant from the county’s Health and Human Services Department earlier this month to develop a two-year plan for combating substance abuse among West Marin youth. The exploratory grant will fund a series of meetings between now and June for addressing problems with alcohol, drugs and tobacco. “We want to find out more about what the issues are,” said Suzanne Sadowsky, the community center’s associate director…