Draft Time Critical Soil Removal Action Workplan, Installation Restoration (IR) Site 9

Summary

SCH Number
2020010339
Lead Agency
Toxic Substances Control, Department of (Department of Toxic Substances Control)
Document Title
Draft Time Critical Soil Removal Action Workplan, Installation Restoration (IR) Site 9
Document Type
NOE - Notice of Exemption
Received
Posted
1/23/2020

Document Description
IR Site 9 operated as the former Chemical Waste Disposal Area from the 1940s to the early 1970s and was also formerly known as Solid Waste Management Unit (SWMU) 9. The site comprises approximately 50 acres, measuring about 1,200 by 1,800 feet. Approximately 75 percent of the area within the site boundary is unpaved (predominantly dredged bay sands) with partial vegetative growth. The Soil Time Critical Removal Action Work Plan, proposed as the soil remedy at the Site, consists of excavation and off-site disposal of contaminated soil at an appropriately permitted landfill. Upon completion of soil removal, clean fill will be brought onto the site for use as backfill. Excavation of approximately 15,820 bank cubic yards (BCY) of contaminated soil would be required to attain the Remedial Action Objectives (RAOs). The work will consist of surface soil removal (up to 1 foot below ground surface [bgs]) at six locations, and subsurface soil removal (up 6 feet bgs) at four locations. Excavation will not occur below the water table ( estimated at a depth of 8 to 10 feet).

Contact Information
Mustapha Guerbaz
Department of Toxic Substances Control
Site Mitigation and Restoration Program 5796 Corporate Avenue
Cypress, CA 90630

Phone : (714) 484-5430

Location

Coordinates
32°41'40.07"N 117°13'26.4"W
Cities
Coronado
Counties
San Diego
Other Location Info
Naval Air Station, North Island, Coronado, County of San Diego, California NAS North Island is located at the northwestern end of the Silver Strand Peninsula, which separates San Diego Bay and San Diego Harbor from the Pacific Ocean in San Diego County, California. Access to NAS North Island is either by the Coronado Bridge from the City of San Diego or the Silver Strand Highway (State Route 75) from Imperial Beach. The southern boundary of the site includes the area just south of Buildings 743 and 744 and includes a paved road located just south of the Weapons Area fence line. The southern and western areas of the site, referred to as "Whalers Bight", was originally shallow tidal marshland marginal to the island. The shoreline was extended to the west between 1935 and 1940 by filling Whalers Bight with dredged bay sediments. The western boundary includes Ammunition Pier Bravo. The eastern and northern boundaries of the site are defined by the limits of contamination present at the site.

Notice of Exemption

Exempt Status
Categorical Exemption
Type, Section or Code
[Class 30 Categorical Exemption Cal. Code Regs. Title 14, §15330]
Reasons for Exemption
The project is a minor action designed to prevent, minimize, stabilize, mitigate or eliminate the release or threat of release of hazardous waste or hazardous substances. See NOE for full details.

Attachments

Notice of Exemption
2020010339_Draft Time Critical Soil Removal Action   PDF 1660 K

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