CREATE TABLE table_70088 ("Date" TEXT, "Tournament" TEXT, "Surface" TEXT, "Partner" TEXT, "Opponents in final" TEXT, "Score" TEXT)

On what surface was the 26 August 2001 tournament played?
SELECT "Surface" FROM table_70088 WHERE "Date" = '26 august 2001'
SELECT "Surface" FROM "table_70088" WHERE "Date" = '26 august 2001'