Napa Hidden Glen Remediation Project
2 Documents in Project
Summary
SCH Number
2025070497
Lead Agency
City of Napa
Document Title
Napa Hidden Glen Remediation Project
Document Type
MND - Mitigated Negative Declaration
Received
Present Land Use
Vacant Land / RS-10 Single Family Residential / Open Space & Parks
Document Description
The City of Napa (the Project Sponsor and Lead Agency) is proposing to conduct remedial action activities on City-owned property (the “Project”) to meet State Minimum Standards and comply with Title 27 of the California Code of Regulations (CCR). The City-owned property is 2.18-acres which includes the former Hidden Glen Dump listed in the CalRecycle Solid Waste Information System (SWIS) database and assigned SWIS NO. 28-AA-0028 (the “Project site”). The Project site (APN #045-411-022-000) is near the intersection of Pascale Place and Glory Court in Napa, CA. The parcel is zoned RS 10 (Single Family Residential – Minimum Lot Size 10,000 Square Feet [Sq Ft]) and is designated Open Space & Parks in the City of Napa 2040 General Plan.
The Project site contains waste-impacted soil and debris in shallow soils from when it was operating as the former Hidden Glen Dump and requires remedial action. On November 26, 2019, the County of Napa Environmental Health, Solid Waste Local Enforcement Agency (LEA) issued a letter to the City of Napa requiring submittal of a workplan to ensure that State Minimum Standards are addressed at the City-owned parcel and in compliance with Title 27 of the CCR. To comply with State Minimum Standards, the letter requires the City to remove and/or cover waste-impacted soil along the flag section and the buffer zone.
A Remedial Action Plan (RAP) was prepared by Ninyo & Moore in October 2024 and approved by the LEA on December 20, 2024. Under the RAP (and the Project), waste-impacted soil around the perimeter of the landfill cap would be excavated to bedrock where feasible, to depths of approximately 10 to 20 inches. The depth of excavation would be reduced if bedrock is encountered at shallower depths. Conversely, the depth of excavation may extend beyond 20 inches if wastes are deeper to reach bedrock or the excavation may terminate in wastes in which case the wastes would be covered with 2 feet of clean imported soil. Where waste removal may not be possible due to access, stability and/or other restrictions, wastes remaining in place would be covered with two 2 feet of clean imported soil to meet state minimum standards. The waste-impacted soil to be removed would be reconsolidated onsite and covered with a minimum of two feet of clean fill essentially capping it. Alternatively, the waste-impacted soil may be hauled offsite to an appropriate landfill for disposal.
The planned remedial action activities would be conducted on City-owned property. However, the City is in negotiations to accept waste-impacted soil from the adjacent residential properties and the RAP (and the Project) includes the possibility of accepting waste-impacted soil from adjacent properties.
Contact Information
Name
Chris Jones
Agency Name
City of Napa Utilities Department
Job Title
Senior Engineer
Contact Types
Lead/Public Agency / Project Applicant
Address
Phone
Name
Dan Jones
Agency Name
RCH Group, Inc.
Job Title
Project Manager
Contact Types
Consulting Firm
Phone
Email
Location
Coordinates
Cities
Napa
Counties
Napa
Regions
Citywide, Countywide
Cross Streets
Pascale Place and Glory Court
Zip
94558
Total Acres
2.18
Parcel #
045-411-022-000
State Highways
CA State Route 121
Schools
Silverado Middle School, Alta Heights Magnet School,
Waterways
Napa River
Township
5N
Range
4W
Section
Lot 39
Base
MDBM
Other Information
Stone Bridge School, Phillips Magnet Elementary, Blue Oak School, Shearer TK-8 School
Notice of Completion
State Review Period Start
State Review Period End
State Reviewing Agencies
California Air Resources Board (ARB), California Department of Conservation (DOC), California Department of Forestry and Fire Protection (CAL FIRE), California Department of Parks and Recreation, California Department of Resources Recycling and Recovery, California Department of Toxic Substances Control (DTSC), California Department of Transportation, District 4 (DOT), California Department of Water Resources (DWR), California Highway Patrol (CHP), California Native American Heritage Commission (NAHC), California Natural Resources Agency, California Regional Water Quality Control Board, San Francisco Bay Region 2 (RWQCB), California State Lands Commission (SLC), Office of Historic Preservation, State Water Resources Control Board, Division of Drinking Water, District 3, State Water Resources Control Board, Division of Water Quality, California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW)
State Reviewing Agency Comments
California Department of Fish and Wildlife, Bay Delta Region 3 (CDFW)
Development Types
Other (Remedial Action on 2.18-acre parcel)
Local Actions
Remedial Action
Project Issues
Aesthetics, Agriculture and Forestry Resources, Air Quality, Biological Resources, Cultural Resources, Cumulative Effects, Drainage/Absorption, Energy, Flood Plain/Flooding, Geology/Soils, Greenhouse Gas Emissions, Hazards & Hazardous Materials, Hydrology/Water Quality, Land Use/Planning, Mandatory Findings of Significance, Noise, Public Services, Solid Waste, Transportation, Tribal Cultural Resources, Utilities/Service Systems, Vegetation, Wetland/Riparian, Wildfire
Public Review Period Start
Public Review Period End
Attachments
Draft Environmental Document [Draft IS, NOI_NOA_Public notices, OPR Summary Form, Appx,]
Notice of Completion [NOC] Transmittal form
State Comment Letters [Comments from State Reviewing Agency(ies)]
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