Would El Cerrito charter hurt public schools?

In a Huffington Post article about a proposal to open a charter school at the site of the Windrush School/Chung Mei Home, two West Contra Costa Unified School District board members express concerns about the impact the charter could have on nearby public schools.

See: http://www.huffingtonpost.com/annette-fuentes/summit-charters-a-course-to-east-bay_b_3697735.html