The configuration of the recreation area must be able to accommodate recreation activities proposed by the development plans. The required minimum area shall not include narrow or irregular pieces of land which are remnants from lotting and/or street and parking areas. Recreational areas shall have a minimum dimension of 50 feet and a minimum area of 10,000 square feet. The Planning Board may vary the minimum area requirement of recreation space when the recreation space, as calculated in § 30-6 of this chapter, is less than the required 10,000 square feet.