Topography After reviewing the petition. ATF determined that due to the topographic and climatic features of Green Valley, it is distinguishable from the surrounding areas. Green Valley is a small valley situated within the southern end of two ranges of the Coast Range, the Vaca Mountains on the east and the Mount George Range on the west. The
watershed in Green Valley flows southward into the Suisun Bay. In the Vacaville-Dixon area, the watershed drains eastward into the
Sacramento River.
Climate Green Valley lies within the Coastal area climate and is characterized by cool, moist winds blowing inland from the ocean and bay almost continuously from May through early Fall. The climate in Green Valley is mid-Region III as classified by the
University of California at Davis system of heat summation by
degree-days (GDD). The season totals for degree-days above 50 degrees Fahrenheit for Green Valley were 3,683.9 in 1973 and 3,498.2 in 1974. In comparison, the season totals for upper Suisun Valley were 3,768.4 in 1973 and 3,700.5 in 1974. In mid-Suisun Valley the season totals were 3,460.4 in 1973 and 3,256.3 in 1974. Suisun Valley lies directly east of Green Valley. Due to the proximity of Green Valley to the
Pacific Ocean, fog is very prevalent in the valley during the months of May, June, July and August. In contrast, fog hardly ever penetrates into the nearby Suisun Valley or into the Vacaville-Dixon area which lies to the east of Suisun Valley.
Soils The soil in Green Valley consists of Conejo clay loam. In contrast the soil in Suisun Valley consists of Brentwood clay loam, Sycamore silty clay loam, San Ysidro sandy loam, and Rincon clay loam. The soil in the Vacaville-Dixon area consists of Yolo loam, Yolo silty clay loam, and Brentwood clay loam. The watershed in Green Valley drains southward into the Suisun Bay. In the Vacaville-Dixon area, which lies to the east of Green Valley and Suisun Valley, the watershed drains eastward into the Sacramento River. After evaluating the petition and the comments received, ATF has determined that due to the topographic and climatic features of Green Valley, it is distinguishable from the surrounding areas. ==Viticulture==