SCH Number 2025070497

Project Info

Title

Napa Hidden Glen Remediation Project

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.

2 documents in project