CREATE TABLE table_35701 ("Track" TEXT, "City" TEXT, "State" TEXT, "Opened  ( closing date if defunct ) " TEXT, "Surface" TEXT, "Length" TEXT)

What is the surface for the riverhead raceway?
SELECT "Surface" FROM table_35701 WHERE "Track" = 'riverhead raceway'
SELECT "Surface" FROM "table_35701" WHERE "Track" = 'riverhead raceway'