Commission Regulation (EEC) No 1670/91 of 14 June 1991 derogating, for the 1991/92 marketing year, from Regulation (EEC) No 3322/89 determining the operative events applicable in the fruit and vegetables sector as regards the processing of lemons and intervention measures for cauliflowers, apricots, peaches, nectarines, lemons and tomatoes and from Regulation (EEC) No 1562/85 as regards the processing of lemons