More Information

For more information about the DuPont site investigation and remediation programs, please click on this link to the Publications web page for documents available via download from this website, or click directly on the links shown below. Local residents will find complete copies of all reports submitted by DuPont to DTSC at the Oakley Public Library, located at 1050 Neroly Road, Oakley, CA.

February 2010
Oakley Repository – List of Available Documents
This is a list of all reports prepared in support of the Oakley Consent Agreement and available at the Oakley public library. Full versions of these documents may also be found in the DTSC website's Envirostor page by scrolling to the "Completed Activities" section for a document list.
February 2010
Final Vapor Intrusion Mitigation Report
The purpose of this report is to: (1) evaluate the potential for future vapor intrusion into buildings so that site redevelopment planners can make intelligent design decisions, and (2) recommend effective building construction methods to ensure that future users will have no concerns about indoor air quality.
November 2009
SWMU 4.2 Soil Investigation and Evaluation
After receiving DTSC comments on the original draft report, an update was submitted to recommend closure of SWMU 4.2 (the former West Basin) by backfilling with clean soil. After the closure plan is approved by DTSC and the area is returned to natural grade, future plans include a possible walking trail along the San Joaquin River and Little Break. No other redevelopment activities are planned for this area.
November 2009
Phase 2 Groundwater RFI Report: Executive Summary
The results of the second phase of groundwater investigation are presented in this report. Activities were conducted from mid-2004 through 2007.
June 2009
Scoping-Level Ecological Risk Assessment (SLERA) Report Executive Summary
The scoping level ecological risk assessment characterizes ecological communities in the water bodies surrounding the site.  The assessment identifies constituents of potential ecological concern in physical media using conservative ecological screening benchmarks and is intended to provide input for the ecological risk management decision-making process at the site. 
May 2009
DFA1 Soil RFI Report: Executive Summary
This report addresses the soil investigation results for the 26.6-acre area designated as Development Focus Area 1 (DFA1). Current plans are to use DFA1 for offices, parking, and temporary materials storage during construction of a power plant on adjacent property owned by DuPont. After power plant construction is complete, this area will be available for development.
April 2009
2008 Annual Groundwater Monitoring Report: Executive Summary
Groundwater monitoring is conducted every quarter at the DuPont Oakley Site, and reports are provided semi-annually. This report covers the results of groundwater monitoring activities conducted throughout 2008.
February 2009
2008 Annual Surface Water Monitoring Report: Executive Summary
Surface water monitoring is conducted semi-annually at the DuPont Oakley Site (in the wet and the dry seasons), and reports are provided semi-annually. This report covers the results of surface-water monitoring activities conducted throughout 2008.
May 2008
Phase 1 Groundwater RFI Report: Executive Summary
The report presents the results of the first of three phases of a groundwater RCRA Facility Investigation at the Oakley Site. The investigations covered by this report took place from 2003 through mid-2004.
May 2008
Plume 1 Northwest Hydrogeologic Characterization Report Executive Summary
The Plume 1 Northwest (NW) Hydrogeologic Characterization Report presents Surficial and Upper Aquifer data associated with Plume 1 specifically in the area adjacent to the E. I. du Pont de Nemours and Company (DuPont) northwestern property boundary.  These data were gathered during an investigation conducted as part of the Phase 2 Groundwater RFI at the Oakley Site. 
December 2007
Phase 3 Surface Water and Sediment RFI Report Executive Summary
The Phase 3 Surface Water and Sediment RFI characterized the surface water and sediments in the San Joaquin River in the vicinity of the former National Pollutant Discharge Elimination System (NPDES)-permitted outfall.  Data gathered will also be used to satisfy the requirements for closure of the outfall.  Further, data resulting from this investigation will be added to other site data to focus future phases of investigation, where necessary.  Surface water data was collected in the San Joaquin River as part of the ongoing surface water monitoring program from 2000 through 2006 (including historical sampling in 2000 and 2001). The sediment data was collected from the area surrounding the former NPDES-permitted outfall.
November 2007
Phase 2 Membrane Interface Probe (MIP) Investigation Report Executive Summary
This report summarizes the field activities during and results of the Phase 2 MIP investigation that was conducted as part of the Phase 2 Groundwater RFI.  The Phase 2 MIP investigation provided key data to guide placement of additional groundwater monitoring wells.
March 2007
Predictive Ecological Risk Assessment, Central Slough and Surrounding Uplands Executive Summary
The Predictive Ecological Risk Assessment for the DuPont Oakley Site incorporates information from previous site investigations including the Phase 1 Central Slough Investigation and the Phase 1 Soils RFI Report and focuses on the areas in and around the Central Slough and Central Slough Channel.
September 2006
Phase 2 Surface Water and Sediment RFI Report
This report summarizes surface water investigations in Little Break as part of the ongoing surface water monitoring program.  Two major tasks were involved in this phase of work: (1) review of surface water data in Little Break to evaluate surface water quality and potential contaminant migration pathways; and (2) collection and analysis of benthic flux chamber water samples from Little Break to evaluate sub-surface water quality and characterize potential groundwater contaminant migration pathways.
March 2006
Phase 1 Soil RFI Report: Executive Summary
The objective of the Phase 1 Soil RFI was to characterize the nature and extent of constituent releases and the potential human-health risks to support the future redevelopment of the Oakley Site as a business park with a mix of industrial, commercial, and retail uses.
March 2006
PRB Construction Completion Report: Introduction, Summary, and Conclusions
This report describes the construction activities completed during construction of the PRB wall described in the Phase 1 Groundwater Interim Measures Work Plan (above).
February 2006
DTSC Fact Sheet – Proposed Cleanup Completion for Three Parcels
This fact sheet provides a brief history of the site and summarizes the actions taken to demonstrate that three parcels of land have not been impacted and were therefore eligible for release for development. These parcels were subsequently released by the DTSC.
February 2005
DTSC Fact Sheet – Proposed Cleanup Plans for Former DuPont Plant
DuPont site history and investigations to date are summarized in this fact sheet, which also provides a discussion of how the PRB wall works and a proposal to remove small areas of soil impacted by agricultural chemicals (likely not tied to DuPont operations) on an adjacent property that was part of the original plant property purchase.
December 2004
Phase 1 Groundwater Interim Measures Work Plan: Introduction
This work plan presents the justification and design for the full-scale permeable reactive barrier (PRB) installed at the Oakley Site in 2005. This passive PRB wall was installed across a portion of the Oakley site to reduce the levels of volatile organic compounds in Plume 1 groundwater.

Other pages in this section:

Highlights

Various other sources of information are also available on this site, including Fact Sheets published by the DTSC, DuPont newsletters related to the Oakley Site, and excerpts from articles written in the local new media.