Occidental Chemical Corp

605 Alexander Ave Tacoma, Pierce County
Facility Site ID: 1212 Cleanup Site ID: 4326

  • Site Status

  • Cleanup Started

Related Information

More about cleanup

What's Happening At The Occidental Cleanup Site?

Updated June 2023. 

We’re preparing the Cleanup Action Plan and getting it ready for public comment in Fall 2023.

Occidental Chemical Corp. is a cleanup site located at 625 Alexander Ave. in Tacoma, WA. There are hazardous substances in the groundwater, soil, and sediment throughout the site. Contamination is from historical operations and waste disposal practices from past owners and operators of the facility.

Learn more at our Occidental Chemical website.

Fish And Shellfish Advisory

People that consume resident fish and shellfish from the Hylebos creek may have an indirect risk of exposure. Find more information about healthy fish consumption at Washington Department of Health’s website.

Shellfish harvesting is closed in Commencement Bay due to pollution. Find out more by visiting Tacoma-Pierce County Health Department’s Safe Shellfish program's website.

Public Drinking Water

Contamination does not affect public drinking water. If you have a private well nearby, please contact Tacoma-Pierce County Health Department at 253-798-6470.
Places to see print documents
Legal 9
Document Title Document Date Document Type
Agreed Order No. DE 16943 - Occidental Chemical Company Facility-Site # 4326 1/24/2020 Agreed Order
Draft Agreed Order Exhibit C 1/26/2017 Agreed Order
Draft Agreed Order Exhibit B 1/26/2017 Agreed Order
Draft Agreed Order Exhibit A 1/26/2017 Agreed Order
Draft Agreed Order Exhibit E 1/17/2017 Agreed Order
Draft Agreed Order Exhibit D 1/17/2017 Agreed Order
Draft Agreed Order 1/17/2017 Agreed Order
Occidental Chemical Corp Administrative Order on Consent Amendment 4/23/1997 Administrative Order on Consent Amendment
PRI Northwest Inc Occidental Enforcement Order 95TC-S242 September 1995 9/5/1995 Enforcement Order
Public Information 13
Document Title Document Date Document Type
Occidental FS Responsiveness Summary 10/29/2018 Responsiveness Summary
Vapor Intrusion Handout - available at 3/8/17 open house 3/8/2017 Fact Sheet\Public Notices
Agreed Order Handout - available at 3/8/17 open house 3/8/2017 Fact Sheet\Public Notices
Sediment and Porewater Study Handout - available at 3/8/17 open house 3/8/2017 Fact Sheet\Public Notices
FS Handout - available at 03/08/2017 open house 3/8/2017 Fact Sheet\Public Notices
FS Public Hearing Presentation 3/8/2017 Multimedia
Public Notice - AO, FS, Related Documents 1/27/2017 Fact Sheet\Public Notices
Occidental Remedial Investigation Responsiveness Summary 10/11/2016 Responsiveness Summary
Occidental Plumes Presentation 10/28/2015 Multimedia
RI Informational Meeting PowerPoint Presentation 10/28/2015 Multimedia
Draft RI Factsheet 10/15/2015 Fact Sheet\Public Notices
Public Notice for Draft RI 10/14/2015 Fact Sheet\Public Notices
Public Participation Plan for Occidental Chemical Corporation Site 8/31/2015 Public Participation Plan
Technical Reports 47
Document Title Document Date Document Type
FinalFeasibilityStudyReportwithEcologyEdits 10/29/2018 Feasibility Study
2017 Draft Dangerous Waste Permit 1/25/2017 Site Specific Technical Document - other
Examination of Silica Preciipitation Gelation and Hydraulic Fouling at the OCC Site 1/23/2017 Site Specific Technical Document - other
Occidental Response Letter to Agency Comments 1/17/2017 Site Specific Administrative Document - other (Administrative correspondence)
Vapor Intrustion Memo 1/13/2017 Site Specific Administrative Document - other (Administrative correspondence)
Ecology's Memo re: Occidental Vapor Intrustion Reports 1/13/2017 Site Specific Administrative Document - other (Administrative correspondence)
Occidental Response Letter to Agency Comments 12/18/2016 12/18/2016 Site Specific Administrative Document - other (Administrative correspondence)
Porewater Data Report Appendix E: Data Validation 11/1/2016 Site Specific Technical Document - other
Occidental Porewater Data Report 11/1/2016 Site Specific Technical Document - other
RI Report Final 8/31/2016 Remedial Investigation Report
2016 Vapor Intrusion Investigation Report with Ecology Notes 3/16/2016 Site Specific Technical Document - other
2016 Vapor Intrusion Report Appendix A 3/16/2016 Site Specific Technical Document - other
2016 Vapor Intrusion Report Appendix C 3/16/2016 Site Specific Technical Document - other
2016 Vapor Intrusion Report Appendix B 3/16/2016 Site Specific Technical Document - other
Draft Occidental Chemical Corporation Feasibility Study 1/25/2016 Feasibility Study
Review and Evaluation of Risk Assessment Documents for the Occidental Chemical Corporation Corrective Action Site 10/30/2015 Human Health and/or Eco Risk Assessment
Draft Remedial Investigation/Site Characterization Report 9/30/2015 Remedial Investigation Report
RI Appendix A: Historical Aerial Photographs 9/30/2015 Remedial Investigation Report
RI Appendix B: Summary of Information Regarding Occidental Site Chemistry Resulting from Past Shipyard Activities 9/30/2015 Remedial Investigation Report
RI Appendix C: Sample Collection and Analysis Table 9/30/2015 Remedial Investigation Report
RI Appendix D: Bathymetric Plots 9/30/2015 Remedial Investigation Report
RI Appendix E: Regional Stratigraphic Logs 9/30/2015 Remedial Investigation Report
RI Appendix F: Site Stratigraphic Logs 9/30/2015 Remedial Investigation Report
RI Appendix G: eDAT Installation and Use Instructions 9/30/2015 Remedial Investigation Report
RI Appendix G: Tacoma Data 9/30/2015 Remedial Investigation Report
RI Appendix H: 3D Detailed Stratigraphic Model 9/30/2015 Remedial Investigation Report
RI Appendix I: Simplified Stratigraphic Model Approach 9/30/2015 Remedial Investigation Report
RI Appendix J: Naturally Occurring Fresh Groundwater-Salt Water Distribution Evaluation 9/30/2015 Remedial Investigation Report
RI Appendix J: Seawater Equilibrium 9/30/2015 Remedial Investigation Report
RI Appendix K: Groundwater Density Distribution 9/30/2015 Remedial Investigation Report
RI Appendix L: Evaluation of Site-Wide Hydraulic Data 9/30/2015 Remedial Investigation Report
RI Appendix M: Evaluation of 709-721 Alexander Avenue Hydraulic Data 9/30/2015 Remedial Investigation Report
RI Appendix N: Single-Well Response Tests Technical Memorandum 9/30/2015 Remedial Investigation Report
RI Appendix O: EVS Mode Parameters 9/30/2015 Remedial Investigation Report
RI Appendix P: List of Data Validation Reports 9/30/2015 Remedial Investigation Report
RI Appendix Q: Dioxin, Furan, and PCB Congener Data 9/30/2015 Remedial Investigation Report
RI Appendix R: Vapor Investigation Report Letter 9/30/2015 Remedial Investigation Report
RI Appendix S: DNAPL Assessment 9/30/2015 Remedial Investigation Report
RI Appendix T: Layered Adobe PDF Map and Cross-Section Packets 9/30/2015 Remedial Investigation Report
RI Appendix U: Natural Attenuation Evaluation 9/30/2015 Remedial Investigation Report
RI Appendix V: Exposure Pathway Assessment 9/30/2015 Remedial Investigation Report
Occidental Vapor Intrusion Mitigation Report 7/1/2014 Site Specific Technical Document - other
2014 Vapor Investigation Report with Ecology Notes 5/22/2014 Site Specific Technical Document - other
2014 Vapor Investigation Appendix A 5/22/2014 Site Specific Technical Document - other
2014 Vapor Investigation Appendix C 5/22/2014 Site Specific Technical Document - other
2014 Vapor Investigation Appendix B 5/22/2014 Site Specific Technical Document - other
Final Conceptual Site Model Report 4/1/2014 Site Specific Technical Document - other
There may be more documents related to this site. To obtain documents not available electronically, you will need to make a public records request.

Places to see print documents

  • Southwest Regional Office
    300 Desmond Dr SE
    Lacey, 98503-1274
    Please schedule an appointment to view print documents at this location.
  • Citizens for a Healthy Bay
    535 Dock St., Suite 213
    Tacoma, 98402
    This location may only have print documents available during open comment periods.
  • Kobetich Library
    212 Browns Point Blvd. NE
    Tacoma, 98422
    This location may only have print documents available during open comment periods.

Contaminants 5

Contaminant Type
Soil
Groundwater
Surface Water
Air
Sediment
Bedrock
Halogenated Organics - Halogenated Organics C C
Metals - Metals Priority Pollutants C
Halogenated Organics - Polychlorinated biPhenyls (PCB) C
Non-Halogenated Organics - Non-Halogenated Solvents C C C
Reactive Wastes - Corrosive Wastes C C
S
Suspected
C
Confirmed Above Cleanup Levels
B
Below Cleanup Levels
RA
Remediated-Above
RB
Remediated-Below
R
Remediated
This contaminant list was based on our best information at the time it was entered. It may not reflect current conditions at the site.