(a) Name. The name of the viticultural area described in this section is “Suisun Valley.”

(b) Approved maps. The appropriate maps for determining the boundaries of the Suisun Valley viticultural area are four U.S.G.S. maps. They are titled:

(1) “Mt. George Quadrangle, California”, 7.5 minute series (1968);

(2) “Fairfield North Quadrangle, California”, 7.5 minute series (1973);

(3) “Fairfield South Quadrangle, California”, 7.5 minute series (1968); and

(4) “Cordelia Quadrangle, California”, 7.5 minute series (1968).

(c) Boundaries. The Suisun Valley viticultural area is located in Solano County, California. The beginning point is the intersection of the Southern Pacific Railroad track with range line “R3W/R2W” in the town of Cordelia, located on U.S.G.S. map “Cordelia Quadrangle.”

(1) From the beginning point, the boundary runs northeast in a straight line to the intersection of Ledgewood Creek with township line “T5N/T4N”;

(2) Thence in a straight line in a northeast direction to Bench Mark (BM) 19 located in the town of Fairfield;

(3) Thence in a straight line due north to Soda Springs Creek;

(4) Thence in a straight line in a northwest direction to the extreme southeast corner of Napa County located just south of Section 34, Township 6 North, Range 2 West;

(5) Thence due west along the Napa/Solano County border to where it intersects with range line “R3W/R2W”;

(6) Thence due south along range line “R3W/R2W” to the point of beginning.