In C3 Districts, the Board of Standards and Appeals may permit commercial beaches for a term not to exceed five years, provided that the Department of Health has certified that the waters may be used for bathing purposes and do not violate safe and acceptable standards of water pollution, and provided further that the Board shall make the following findings:

(a)        that such use is so located as to minimize interference with the movement and navigation of ships or boats;

(b)        that no more than 20 percent of the shore line in any one mapped district is used for such use;

(c)        that no accessory stands for the sale of food or drink shall be located within 100 feet of a Residence District boundary, and that the total floor area of all such stands shall not exceed 200 square feet; and

(d)        that such use will not create such traffic congestion as to impair the residential character of the area. The Board shall refer the application to the Department of Traffic for a report as to whether the use will create such detrimental traffic congestion that it impairs such residential character.

The Board may prescribe appropriate conditions and safeguards to minimize adverse effects on the character of the surrounding area, or requirements for the shielding of floodlights or adequate screening.