Napa Valley Marina 2021 Dredging (Notification of Lake or Streambed Alteration, EPIMS Notification No. NAP-20435-R3)
Summary
SCH Number
2021090460
Public Agency
California Department of Fish and Wildlife, Bay Delta Region 3
(CDFW)
Document Title
Napa Valley Marina 2021 Dredging (Notification of Lake or Streambed Alteration, EPIMS Notification No. NAP-20435-R3)
Document Type
NOE - Notice of Exemption
Received
Posted
9/24/2021
Document Description
The project is limited to conducting one dredging episode during the environmental work window of August 1 – October 15 when temperatures throughout the water column exceed 22 degrees Celsius (i.e., when longfin smelt (Spirinchus thaleichthys) and other special-status species are not expected to occur in the project area). The
dredging episode is anticipated to be split across two years (i.e., begin during the environmental work window in 2021 and be completed in 2022) and will remove up to 3,930 cubic yards of sediment from an approximately 0.61- acre area. The project will use a cutter suction (i.e., hydraulic) dredge with a hood (i.e., an IMS Dredge, Model
6008) mounted on a 44-foot barge and operated at a maximum rate of withdrawal of 910 gallons per minute. The area will be dredged to a depth of -9 feet Mean Lower Low Water (MLLW), which includes 1-foot over-dredge. Dredging spoils will be transported through an 8-inch pipeline starting at the barge and ending at the settling basin on the Napa Sea Ranch property immediately north of Carneros Creek. The pipeline will temporarily span Creek via an approximately 4-foot wide temporary metal footbridge; both the pipeline and the footbridge will be laid by hand on the ground surface. The pipeline and footbridge will be removed immediately upon completion of the project.
Contact Information
Name
Garrett Allen, Environmental Scientist
Agency Name
CDFW
Contact Types
Lead/Public Agency
Phone
Location
Cities
Napa
Counties
Napa
Regions
Northern California, San Francisco Bay Area
Other Location Info
The project is located at the Napa River in an unincorporated area of Napa County, State of California; Latitude 38.220078º, Longitude -122.311704º; 1200 Milton Road, Napa, CA 94559; Assessor’s Parcel Number 047-330-017. Specifically, the project is located within the Napa Valley Marina where it opens to the west side of the Napa River, approximately 500 feet downstream of the Napa River’s confluence with.
Notice of Exemption
Exempt Status
Categorical Exemption
Type, Section or Code
15304
Reasons for Exemption
The project consists of 1) minor public alterations in the condition of land, water, and/or vegetation which do not involve the removal of healthy, mature, scenic trees except for forestry or agricultural purposes; and 2) maintenance dredging where the spoil is deposited in a spoil area authorized by all applicable state and federal regulatory agencies.
County Clerk
Napa
Attachments
Notice of Exemption
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