The applicant is seeking a Resource Management Permit and a Grading Permit to build a new single-family residence of 5,865 sq. ft. (2,728 sq. ft. 1st floor and 3,137 sq. ft. 2nd floor), attached three-car garage of 759 sq. ft., attached two-story pool cabana of 791 sq. ft. (428 sq. ft. upper floor and 363 sq. ft. lower floor), pool, new septic system, and associated alterations to the driveway/flatwork. Four 5,000-gallon water tanks are proposed for fire protection purposes. The existing single-family dwelling will be demolished. The project involves 800 cubic yards (c.y.) of cut, and 600 c.y. of fill. Eighteen trees are proposed for removal due to their location within the footprint of development and grading, seventeen of which have a circumference larger than 38 inches and therefore are considered significant by San Mateo County. The impervious surface on the lot will increase from 5,266 sq. ft. to 12,593 sq. ft. as a result of the proposed development. The project is within the San Mateo County State Highway 84/ La Honda Road County scenic corridor. The parcel is a 1.476-acre parcel zoned RM (Resource Management) within the unincorporated North Skyline area (APN 078-120-050), known as 12660 Williams Ranch Road. The parcel will continue to be served by the San Mateo County Fire Department, a private water well, and a new private septic system. Access will continue to be provided off of Williams Ranch Road via a private driveway.