Hewlett-Packard (620-640 Page Mill Road)
EPA #: CAD980884209
State: California(CA)
County: Santa Clara
City: Palo Alto
Congressional District: 14
Other Names: Other Names:
Bulletin Board
The September 2010 Five-Year Review report is posted in the "Documents and Reports" section below.
Description and History
NPL Listing History
NPL Status: Final
Proposed Date: 06/24/88
Final Date: 02/21/90
Deleted Date:
Hewlett-Packard manufactured optoelectronic equipment on this 10-acre site from 1962 to 1986. In 1981, at least 300 gallons of waste solvents leaked from an underground storage tank. The company excavated the tank and approximately 100 cubic yards of contaminated soil in 1981 and transported the materials to a hazardous waste disposal facility. Since 1982, the company has been pumping and treating contaminated groundwater from the shallow, chemically affected, aquifer. Five municipal backup supply wells draw water from a deeper aquifer located within 3 miles of the site. The nearest residential areas are located approximately 1/8 of a mile northeast of the facility.
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Contaminants and Risks
Contaminated Media:
Groundwater
Soil and Sludges
Volatile organic compounds (VOCs) were detected in groundwater under the tank area and in the soils sampled from the former tank location. Potential health risks include accidentally ingesting or coming into direct contact with contaminated groundwater or soil. Chemicals in the shallow aquifer have migrated off site.
Who is Involved
This site is being addressed through Federal, State, and potentially responsible parties' actions.
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Investigation and Cleanup Activities
This site is being addressed in two stages: immediate actions and a long-term remedial phase focusing on cleanup of the entire site.
Initial Actions
Immediate Actions: In addition to the tank and soil excavation activities conducted in 1981, Hewlett-Packard excavated an additional 810 cubic yards of soil around the former tank area in 1987. Pumping and treating contaminated groundwater has been underway since 1982.
Remedy Selected
Entire Site: In 1989, under State oversight, Hewlett- Packard initiated an investigation to determine the nature and extent of contamination remaining at the site and to identify alternative cleanup remedies. The investigation was completed and a final cleanup remedy was selected in 1995. The remedy includes groundwater extraction and treatment, and soil vapor extraction and treatment.
Cleanup Results to Date
The excavation and disposal of the storage tank and contaminated soil and the continuing treatment of contaminated groundwater have reduced the potential for exposure to hazardous materials at the Hewlett-Packard (620-640 Page Mill Road) site.
The Third Five Year Review completed in September 2010 concluded that, although Hewlett-Packard has evaluated the vapor intrusion potential in the past to the satisfaction of the Regional Water Quality Control Board,, recent changes in the evaluation methods (primarily the adoption of a multiple lines of evidence approach) require additional analysis of the vapor intrusion pathway for certain portions of the Site. All other exposure pathways that could result in unacceptable risks are being controlled, and institutional controls are preventing exposure to, or the ingestion of, contaminated groundwater. The groundwater monitoring program in the Off-Property Study Area should be expanded to characterize the extent of TCE contamination in the A1U, A1, and A2 Zones. In the off-Property Study Area, the vapor intrusion exposure pathway will be re-evaluated within approximately 18 months. The Five-Year Review addendum should be completed by October 30, 2012.
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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.
On-line information about the PRPs for the site is not yet available.
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Public Information Repositories
The most complete collection of documents
is the official EPA site file, maintained at
the following location:
Superfund Records Center
Mail Stop SFD-7C
95 Hawthorne Street, Room 403
San Francisco, CA 94105
(415) 820-4700
Enter main lobby of 75 Hawthorne street,
go to 4th floor of South Wing Annex.
The public information repositories for
the site are at the following locations:
U.S. Geological Survey Library,
345 Middlefield Road,
Menlo Park, CA 94025
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Contacts
|
Name |
Phone Number |
Email |
Address |
| EPA Site Manager |
Matt Salazar |
415-972-3982 |
Salazar.Matt@epamail.epa.gov |
Mail Code SFD71
75 Hawthorne Street
San Francisco, CA 94105 |
EPA Community
Involvement Coordinator |
Vicki Rosen |
415-972-3244
1-800-231-3075 |
Rosen.Vicki@epamail.epa.gov |
Mail Code SFD63
75 Hawthorne Street
San Francisco, CA 94105 |
EPA Public Information
Center |
|
415-947-8701 |
r9.info@epa.gov |
|
| State Contact |
Roger Papler |
510-622-2435 |
RPapler@waterboards.ca.gov |
SF Bay RWQCB
1515 Clay St.
Ste. 1400
Oakland, CA 94612 |
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| Other Contacts |
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After Hours
(Emergency Response) |
US EPA |
(800) 424-8802 |
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