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

(b) Approved maps. The six United States Geological Survey maps used to determine the boundary of the Santa Maria Valley viticultural area are titled:

(1) Orcutt Quadrangle, California-Santa Barbara Co., 7.5 minute series, 1959, photorevised 1967 and 1974, photoinspected 1978;

(2) Santa Maria Quadrangle, California, 7.5 minute series, 1959, photorevised 1982;

(3) “San Luis Obispo”, N.I. 10-3, series V 502, scale 1: 250,000;

(4) “Santa Maria”, N.I. 10-6, 9, series V 502, scale 1: 250,000;

(5) Foxen Canyon Quadrangle, California-Santa Barbara Co., 7.5-minute series, 1995; and

(6) Sisquoc Quadrangle, California-Santa Barbara Co., 7.5 minute series, 1959, photoinspected 1974.

(c) Boundary. The Santa Maria Valley viticultural area is located in Santa Barbara and San Luis Obispo Counties, California. The boundary of the Santa Maria Valley viticultural area is as follows:

(1) Begin on the Orcutt quadrangle map at the intersection of U.S. Route 101 and Clark Avenue, section 18 north boundary line, T9N/R33W, then proceed generally north along U.S. Route 101 approximately 10 miles onto the Santa Maria quadrangle map to U.S. Route 101's intersection with State Route 166 (east), T10N/R34W; then

(2) Proceed generally northeast along State Route 166 (east) onto the San Luis Obispo N.I. 10-3 map to State Route 166's intersection with the section line southwest of Chimney Canyon, T11N/R32W; then

(3) Proceed south in a straight line onto the Santa Maria N.I. 10-6 map to the 3,016-foot summit of Los Coches Mountain; then

(4) Proceed southeast in a straight line onto the Foxen Canyon quadrangle map to the 2,822-foot summit of Bone Mountain, T9N/R32W; then

(5) Proceed south-southwest in a straight line approximately 6 miles to the line's intersection with secondary highways Foxen Canyon Road and Alisos Canyon Road and a marked 1,116-foot elevation point, T8N/R32W; then

(6) Proceed west-northwest in a straight line approximately 6 miles onto the Sisquoc quadrangle map to the southeast corner of section 4, T8N/R32W; then

(7) Proceed west-northwest in a straight line approximately 6.2 miles, crossing over the Solomon Hills, to the line's intersection with U.S. Route 101 and a private, unnamed light-duty road that meanders east into the Cat Canyon Oil Field, T9N/R33W; then

(8) Proceed north 3.75 miles along U.S. Route 101 onto the Orcutt quadrangle map and return to the point of beginning.