CREATE TABLE table_name_15 (facility_id INTEGER, city_of_license VARCHAR(255), erp___power_w VARCHAR(255))
Which Facility ID has a City of license of springfield, ma, and a ERP / Power W smaller than 230?
    
SQL: SELECT MAX(facility_id) FROM table_name_15 WHERE city_of_license = "springfield, ma" AND erp___power_w < 230