(a) Name. The name of the viticultural area described in this section is ``Yorkville Highlands.''
(b) Approved maps. The appropriate maps for determining the boundary of the Yorkville Highlands viticultural area are the following six U.S.G.S. topographical maps (7.5 minute series, 1:24000 scale):
(1) Gube Mountain, Calif., provisional edition 1991;
(2) Big Foot Mountain, Calif., provisional edition 1991;
(3) Cloverdale, Calif., 1960, photoinspected 1975;
(4) Ornbaun Valley Quadrangle, Calif., provisional edition, 1991;
(5) Yorkville, Calif., provisional edition, 1991;
(6) Hopland, Calif., 1960, photoinspected 1975.
(c) Boundary. The Yorkville Highlands viticultural area is located in Mendocino County, California. The boundary is as follows:
(1) The beginning point is Benchmark 680, located in Section 30, T. 12 N., R. 13 W., on the Ornbaum Valley quadrangle map;
(2) From the beginning point, the boundary proceeds in a straight line in a northeasterly direction to a point intersecting the North Fork of Robinson Creek and the Section 20, T. 13 N., R. 13 W.;
(3) The boundary then proceeds in a straight line in a southeasterly direction to the summit of Sanel Mountain, located at the southeast corner of Section 30, T. 13 N., R. 12 W., on the Yorkville quadrangle map;
(4) The boundary then proceeds in a straight line in a southeasterly direction until it reaches the southeast corner of Section 15, T. 12 N., R 11 W., on the Hopland quadrangle map;
(5) The boundary then proceeds south, following the eastern boundaries of Sections 22 and 27, T. 12 N., R 11 W., until it reaches the Mendocino-Sonoma County line on the Cloverdale quadrangle map;
(6) The boundary then follows the Mendocino-Sonoma county line west, south and west until it reaches the southwest corner of Section 32, T. 12 N., R. 11 W.;
(7) The boundary then diverges from the county line and proceeds in a northwesterly direction, traversing the Big Foot Mountain quadrangle map, until it reaches the southwest corner of Section 5, T. 12 N., R. 13 W. on the Ornbaun Valley quadrangle map;
(8) The boundary proceeds in a straight line in a northerly direction until it reaches the beginning point at Benchmark 680. [T.D. ATF-397, 63 FR 16904, Apr. 7, 1998]