(a) Name. The name of the viticultural area described in this section is “Fountaingrove District.” For purposes of part 4 of this chapter, “Fountaingrove District” is a term of viticultural significance.

(b) Approved maps. The four United States Geological Survey (USGS) 1:24,000 scale topographic maps used to determine the boundary of the Fountaingrove District viticultural area are titled:

(1) Mark West Springs, CA; 1993;

(2) Calistoga, CA; 1997;

(3) Kenwood, CA; 1954; photorevised 1980; and

(4) Santa Rosa, CA; 1994.

(c) Boundary. The Fountaingrove District viticultural area is located in Sonoma County, California. The boundary of the Fountaingrove District viticultural area is as described below:

(1) The beginning point is on the Mark West Springs map at the intersection of the shared Sonoma-Napa County line with Petrified Forest Road, section 3, T8N/R7W.

(2) From the beginning point, proceed southeasterly along the Sonoma-Napa County line, crossing onto the Calistoga map and then the Kenwood map, to the marked 2,530-peak of an unnamed mountain, section 9, T7N/R6W; then

(3) Proceed west-southwest in a straight line to the marked 2,730-foot summit of Mt. Hood, section 8, T7N/R6W; then

(4) Proceed west-northwest in a straight line to the marked 1,542-foot summit of Buzzard Peak, section 11, T7N/R7W; then

(5) Proceed west-southwest in a straight line, crossing onto the Santa Rosa map, to the intersection of State Highway 12 and Los Alamos Road; then

(6) Proceed due north in a straight line to the southern boundary of section 9, T7N/R7W; then

(7) Proceed west-northwest along the southern boundaries of sections 9, 4, and 5, T7N/R7W, to the western boundary of the Los Guilicos Land Grant; then

(8) Proceed west-southwest along the southern boundaries of sections 5, 6, and 7, T7N/R7W; then continue west-southwest along the southern boundaries of sections 12 and 11, T7N/R8W, to the point where the section 11 boundary becomes concurrent with an unnamed light-duty road known locally as Lewis Road; and then continue west-southwest along Lewis Road to the road's intersection with Mendocino Avenue in Santa Rosa; then

(9) Proceed north-northwesterly along Mendocino Avenue to the road's intersection with an unnamed road known locally as Bicentennial Way; then

(10) Proceed north in a straight line, crossing through the marked 906-foot elevation peak in section 35, T8N/R8W, and, crossing on to the Mark West Springs map, continue to the line's intersection with Mark West Springs Road, section 26, T8N/R8W; then

(11) Proceed northerly along Mark West Springs Road, which turns easterly and becomes Porter Creek Road, to the road's intersection with Franz Valley Road, section 12, T8N/R8W; then

(12) Proceed northeasterly along Franz Valley Road to the western boundary of section 6, T8N/R7W; then

(13) Proceed south along the western boundary of section 6, T8N/R7W, to the southwest corner of section 6; then

(14) Proceed east, then east-northeast along the southern boundaries of sections 6, 5, and 4, T8N/R7W, to the southeast corner of section 4; then

(15) Proceed north along the eastern boundary of section 4, T8N/R7W, to the Sonoma-Napa County line; then

(16) Proceed easterly along the Sonoma-Napa County line to the beginning point.