Vineyard 7 & 8 Track 1 Replant Vineyard Erosion Control Plan

2024070091

Napa County

NOE - Notice of Exemption

7/2/2024

7/2/2024

Pamela Arifian

Napa County

Planner III

Lead/Public Agency

1195 Third Street Second Floor
Napa, CA 94559

(707) 259-5934

pamela.arifian@countyofnapa.org

38°31'37.2"N 122°33'7.2"W

Spring Mountain Road

94574

20.9

020-300-063

N/A

N/A

N/A

N/A

Mill Creek, Ritchie Creek, York Creek

08N

06W

20

MDM

The project is located in the Mill Creek drainage on one parcel totaling approximately 39.66 acres (4032 Spring Mountain Road) located approximately 1.7 miles west of the intersection of Spring Mountain Road and Langtry Road in Napa County, California

Categorical Exemption

Class 1, Section 15301 and Class 4, Section 15304 and Appendix B of Napa County's Local Procedures for Implementing CEQA

Exemption Criteria Conformance Evaluation (Class 1): The entire footprint of the area to be replanted is within the footprint of the vineyard as it existed on June 16, 1993, and proposed Block 7 is also within the footprint of the vineyard as on the approved erosion control plan #P11-00005-ECPA. With the assumption that the specified cover levels will be maintained, the amount of sediment delivered from the proposed new and replanted vineyard blocks would not be increased beyond current levels or the USDA soil loss tolerance level. The Napa County Engineering Division confirmed technical adequacy of the soil loss and runoff studies on May 31, 2024. The footprint of the area to be replanted within one parcel totals approximately 20.9 gross acres (17.9 net acres) of vineyard. The proposed replant would replace existing vineyard and would not result in an increase in groundwater demand. Exemption Criteria Conformance Evaluation (Class 4): The vineyard replant in Blocks 8A-C is approximately 1.2 gross acres in area, with an average slope of 13.8%. See attached correspondence with Rich Paxton dated June 5, 2024. The vineyard conversion is proposed in the Mill Creek drainage, which is known to have been less than 5 ½% converted to vineyard since June 16, 1993. Approximately 3.8% of the Mill Creek drainage has been converted to vineyard since 1993. The proposed replant of 1.2 acres of vineyard would be irrigated by groundwater. The original development of Blocks 8A-C occurred sometime around 2005, and was authorized under a sequence of approvals related to the winery (refer to project record). A Phase I Water Availability Analysis was prepared for the #P11-00005-ECPA, and accounts for the water use associated with Blocks 8A-C as an existing condition. Replant of these blocks would not increase existing groundwater demand. The vineyard conversion is proposed in an area located greater than ½ mile from the nearest active or potentially active mine or quarry or designated Mineral Resource Area. The nearest mineral resource area, active or potentially active mine or quarry is over 25 miles from the project site.