Pacific Southwest, Region 9: Superfund
Serving Arizona, California, Hawaii, Nevada, the Pacific Islands, and Tribal Nations
Crazy Horse Sanitary Landfill
EPA #: CAD980498455
Congressional District: 17
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Description and History
NPL Listing History
NPL Status: Final
Proposed Date: 06/24/88
Final Date: 08/30/90
The 125-acre Crazy Horse Sanitary Landfill site operated as a sanitary landfill from 1966 to 2009. Prior to 1966, the site was used as an open burning dump for several decades. Reportedly, from the early 1970s to 1982, the Firestone Tire & Rubber Company disposed of large quantities of waste on the site from its vulcanizing process, which included rubber, carbon black and other fillers, oils, and mixed solvents. This material consisted of wastes containing mainly benzene and toluene. In 1987, off-site properties with contaminated wells were purchased by the City of Salinas. Approximately 6,200 people obtain drinking water from private wells located within three miles of the site. The site completed formal closure in 2014. Current monitoring for the site includes semiannual sampling of 46 groundwater monitoring wells, 8 offsite residential supply wells, influent and effluent samples from the groundwater treatment system, and the sedimentation basin. In addition, landfill gas condensate, leachate and retention basin sediment are collected annually.
The EPA has deferred to the state lead agency for this site, the California Regional Water Quality Control Board, Central Coast Region, San Luis Obispo, CA.
Contaminants and Risks
Air and groundwater on site are polluted with volatile organic compounds (VOCs). Potential health threats include ingesting, coming into direct contact with, and inhaling contaminated groundwater and groundwater vapors. Concentrations of contaminants in the air are not high enough to pose a significant health threat.
Who is Involved
This site is being addressed through Federal, municipal, and potentially responsible parties' actions. The State is the lead agency for this site, and therefore is the primary contact.
Investigation and Cleanup Activities
This site is being addressed in two stages: initial actions and a long-term remedial phase focusing on cleanup of the entire site.
Initial Actions: Approximately six acres of the landfill were closed in 1988 and covered with a high-density, polyethylene membrane and two feet of soil. Dewatered, digested, sewage sludge was placed on top of the area to promote revegetation. The southeastern edge of the area was lined with bales of straw to retard surface water runoff. The City also pumped water from wells in an attempt to stabilize the groundwater contamination. Six extraction wells initially were installed as an interim measure, followed by the installation of 17 additional wells to completely capture the migrating plume. Adjacent residential wells were either permanently sealed or converted into extraction or monitoring wells. Contaminated water was pumped from the extraction wells and treated by air stripping. Treated water is stored in collection tanks and then either reinjected into the ground through 27 recharge wells or used for dust control.
Entire Site: EPA is reviewing the effectiveness of the initial actions to determine whether additional cleanup measures are needed.
Cleanup work is proceeding under Regional Water Quality Control Board Order R3-2013-0016.
Cleanup Results to Date
Covering portions of the landfill and treating the groundwater have reduced the potential of exposure to contaminated materials at the Crazy Horse Sanitary Landfill site while investigations are being completed.
Potentially Responsible Parties
Potentially responsible parties (PRPs) refers to companies that are potentially responsible for generating, transporting, or disposing of the hazardous waste found at the site.
The PRP for this site is the Salinas Valley Solid Waste Authority (SVSWA).
Documents and Reports
No documents found
Public Information Repositories
The public information repositories for the site are at the following locations:
State of California CRWQCB,
Central Coast Region,
82 Higuera Street, Suite 200,
San Luis Obispo, CA 93401-5414
EPA Site Manager
Mail Code SFD
75 Hawthorne Street
San Francisco, CA 94105
EPA Community Involvement Coordinator
Mail Code SFD-6-3
75 Hawthorne Street
San Francisco, CA 94105
EPA Public Information Center
After Hours (Emergency Response)