what is the type when the rank is smaller than 70, the province is british columbia and the capacity (mw) is more than 2,480?
CREATE TABLE "largest_generating_stations" (
  "rank" real,
  "name" text,
  "capacity_mw" real,
  "province" text,
  "type" text
);
SELECT "type" FROM "largest_generating_stations" WHERE "rank"<70 AND "province"='british columbia' AND "capacity_mw">'2,480';