The Board of Appeals shall act in strict accordance with the procedure specified by law. All appeals and applications made to the Board shall be in writing, on forms prescribed by the Board. Every appeal or application shall refer to the specific provision of the law involved and shall exactly set forth the interpretation that is claimed, the use for which the special permit is sought or the details of the variance that is applied for and the grounds on which it is claimed that the variance should be granted, as the case may be. Each application for an area or use variance or special extension shall be accompanied by a proposed site plan at an appropriate scale showing the size and placement of the lot, surrounding land use, design and location of proposed buildings, driveways, parking areas, landscaping and screening, proposed drainage and utility systems and existing and proposed contours of the land.