The purpose of the preliminary plan is to display graphically the data necessary to review the entire development, as planned and proposed, and to coordinate its development with adjacent existing or potential development. Preliminary plans shall be reviewed to determine that the proposed development conforms with all applicable ordinances, regulations and policies of the county and other review agencies and to assist the subdivider with respect to the overall plan of development. The intent of the preliminary plan is not to develop fully-engineered construction drawings, but to provide a generalized layout and design of sufficient detail to determine that all applicable standards can be met and that the subdivision will be integrated into the overall pattern of development within the surrounding community.