IntroductionThe Department of Toxic Substances Control (DTSC) wants to inform you of our proposeddecision known as Corrective Action Completion without controls for three parcels of land atthe former DuPont manufacturing plant in Oakley. This means that DuPont and DTSC havefinished investigation and cleanup of these parcels. These three parcels are shown in Figure A,page 2, and are known as the Eastern Development Area, Western Development Area, and theCline Property Area (referred to as three parcels). DTSC is now proposing that DuPont hasfully investigated the three parcels and that these parcels are now suitable for unrestricted landuse development. Unrestricted land use means 1) the levels of chemicals of concern in soil wereeither non-detect or below state cleanup standards and 2) the levels of chemicals of concern ingroundwater were either non-detect or below the state drinking water cleanup standards. Thereare still two other parcels of property at the former DuPont plant that will continue to undergofurther investigations and cleanup. These two parcels are known as the Northern DevelopmentArea and Southern Development Area. DTSC continues to work with DuPont to investigatecontamination of the soil, groundwater, and surface water in these two areas of the formermanufacturing plant.

In addition, DTSC proposes to approve the change in the regulated property boundary at theDuPont site. The original regulated property boundary represented the property owned orcontrolled by DuPont when they applied for a permit authorization from DTSC in November of1981. The proposed property boundary change action will release the three parcels in questionfrom future DTSC oversight. Figure B, page 3, shows the former definition of the propertyboundaries under DTSC oversight. This property boundary change is in keeping with the jointCity of Oakley and DuPont plan to redevelop the former plant site in a phased manner.

Fact Sheet, February 2006

You May Comment on ProposedCleanup Completion for Three Parcelsat the Former DuPont Plant

YOUR COMMENTS SOUGHT ON PROPOSEDCLEANUP COMPLETION FOR THREE PARCELS

FORMER DUPONT PLANT

The Public Comment Period is from:

FEBRUARY 27 TO APRIL 12, 2006

DTSC will hold a public hearing onPlease send comments to: Issues related to this proposal:

Sal Ciriello, DTSC Manager March 28, 2006, 6:30 P.M.700 Heinz Avenue, Suite 200 Administrative Office BuildingBerkeley, California 94710-2721 Former DuPont Facility(510) 540-3972 6000 Bridgehead Road SCiriell@dtsc.ca.gov Oakley, California 94561-2940

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You may comment on this proposed Corrective ActionCompletion Determination and the change to theDuPont regulated facility boundary from February 27,2006, to April 12, 2006. Please send your comments toSal Ciriello at the address listed on page 1. DTSC willhold a public hearing on issues related to this proposalon March 28, 2006, at 6:30 PM at the AdministrativeOffice Building at the former DuPont Facility at 6000Bridgehead Road in Oakley.

Site History and DescriptionThe former DuPont plant is located at 6000 BridgeheadRoad in Oakley, Contra Costa County, California.DuPont property is bordered to the north by the SanJoaquin River, to the south by the Burlington NorthernSanta Fe Railroad, to the east by Big Break Road, andto the west by Highway 160. DuPont operated amanufacturing plant on the site from 1956 to 1997. Atthe height of its operations, DuPont employed nearly600 people. Originally built to make the gasoline “anti-knock” agent tetraethyl lead, DuPont also startedmaking refrigeration cooling compounds calledFreon®. In 1963, DuPont started producing titaniumdioxide, a white pigment used in a number of householdproducts and foods.From 1989 to 1997, DuPont reused one of thebyproducts of the titanium dioxide manufacturingprocess by combining it with cement and offering it forsale as a roadway sub-base material under the tradename Sierra-Crete®. DuPont stopped all productionactivities at the Oakley Site in 1998 and demolishedmost of the buildings in 1999. The company now uses asmall portion of the site for quality control testing ofautomotive paints.

regulatory oversight. If approved, these parcels may bedeveloped for any use by DuPont and the City ofOakley. DTSC will change the regulated propertyboundary of the DuPont facility to contain theremaining two parcels, namely the Northern andSouthern Development Areas (Figure A, above).

Details of the Three ParcelsEastern Development AreaThis 4-acre area was used for overflow parking by BigBreak Marina, which is located to the northeast of theparcel. At no point was this area ever used for anypurpose related to DuPont plant operations. In the early1990s, Big Break Marina was dredged, and theresulting materials were placed in the EasternDevelopment Area. An environmental assessment,including soil and groundwater evaluations, has beenconducted to ensure that the Eastern Development Areawill not require cleanup. All soil sampling showed nocontamination present above state cleanup levels. Allgroundwater monitoring showed no groundwatercontamination present above state cleanup levels.DuPont will continue to monitor its groundwater wellsto document future groundwater quality. As a result,DTSC proposes to end its oversight as no longerrequired for the Eastern Development Area.

Western Development AreaThe 45-acre Western Development Area served as theadministrative hub of the former DuPont manufacturingfacility. It includes a parking lot, security office andadministration building, an electrical substation,landscaped areas, and areas that were previouslycultivated as buffers between plant operations and the

DTSC Proposes Completion ofCleanupBased on DuPont’s investigation results,two property parcels, the Western andEastern Development Areas, do not havecontamination present above the standardsfor unrestricted (i.e., residential) land use.Evaluation of these results shows thatunrestricted land use in these areas does notpose a risk to people.

The Cline Property investigation revealed asmall amount of soil contamination thatrequired cleanup action (as described in theDTSC February 2005 fact sheet). OnceDuPont completed that cleanup in June2005, the Cline Property met theunrestricted land use standards. You mayread further in the details of the threeparcels section below.

Based on these actions, DTSC considers thecleanup at the three parcels complete andplans to release these parcels from further

Figure A. Parcels to be released for unrestricted land use, and pro-posed DuPont property to remain under regulatory oversight

Are you on DTSC’s Mailing List?If you would like to be on the mailing list, please fill out the information below and mail back toNathan Schumacher, DTSC, 8800 Cal Center Drive, Sacramento, CA 95826.

o Please take me off the mailing list.

Name:

Address:

City/State/Zip:

Phone: Fax: E-Mail:

Note: While the mailing list is solely for DTSC use, the list is considered a public record.

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Figure B. DuPont Facility – Original Boundary

pesticides that may have been spilled during storageor loading of agricultural equipment. DuPontproposed soil removal, and received permission tocomplete this project as described in a DTSC factsheet published in February 2005. In June 2005,DuPont removed fourteen cubic yards of soil fromin and around the farm buildings. Aftercontaminated soil was excavated, samples werecollected to confirm that the removal action wassatisfactorily completed. The excavations werebackfilled with clean soil, and the contaminated soilwas shipped to an approved offsite facility fordisposal.All confirmation soil sampling results showed nosoil contamination present above state cleanuplevels. Groundwater has not been affected at this

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public, but are now disked for fire control. A multi-phase environmental assessment, including soil andgroundwater evaluations, was conducted in this area.Soil sampling showed a small amount of chemicalspresent. They were well below state cleanup levels.DuPont’s monitoring wells for groundwater detectedlittle groundwater contamination present beneath theWestern Development Area. Again, these chemicalswere well below state cleanup levels. DuPont willcontinue to monitor these wells to document futuregroundwater quality. As a result, DTSC proposes toend its oversight as no longer required for theWestern Development Area. Also, this proposalwill designate this area for unrestricted land use.

Cline PropertyPart of the property originally purchased by DuPonthas been continuously used for agriculturalproduction. The Cline Property contains a house andseveral small farm buildings used to store equipmentand agricultural products, including fertilizers andpesticides. Sampling conducted in and around thefarm buildings found small amounts of residual

parcel. With the completion of this removal action, DTSCrequires no further cleanup.

California Environmental Quality ActDTSC has reviewed and considered the environmentaleffects of this proposed Corrective Action Completedwithout controls decision to remove these three parcels ofland from the regulated facility boundary. DTSC agreeswith the DuPont findings that soil contamination is belowthe standards (United States Environmental ProtectionAgency preliminary remediation goals) for unrestrictedland use. Similarly, the results of monitoring groundwaterbelow these three parcels showed that the levels ofchemicals were either non-detect or below drinking waterstandards. Therefore, DTSC has prepared a Notice ofExemption stating the above findings. This Notice ofExemption will be filed with the State Clearinghouse of theGovernor’s Office of Planning and Research when DTSCmakes its final decision.

INFORMATION REPOSITORIESThe “Corrective Action Completion” binder andthe investigation reports for the three parcels, aswell as the Cline Property Soil Removal Reportare available for review at:

The Oakley Public Library1050 Neroly RoadOakley California 94561(925) 625-2400

DTSC File Room8800 Cal Center DriveSacramento CA 95826(916) 255-3758

NOTICE TO HEARINGIMPAIRED INDIVIDUALS

TDD users can obtain information about the siteby using the California State Relay Service (888)877-5378 to reach Nathan Schumacher at (916)255-3650 regarding DuPont.

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FOR MORE INFORMATIONIf you have questions, please contact:

Nathan SchumacherDTSC Public Participation SpecialistToll Free 866-495-5651E-mail at NSchumac@dtsc.ca.gov

Sal CirielloDTSC Manager(510) 540-3972E-mail at SCiriell@dtsc.ca.gov

For media inquiries, please call Angela BlanchetteDTSC Public Information Officer(510) 540-3732Email at ABlanche@dtsc.ca.gov

ANUNCIOSi prefiere hablar con alguien en español acercade DuPont, favor de llamar a Jesus Cruz de elDepartmento de Control de Substancias Tóxicas.El número de teléfono es (916) 255-3315.