Update Log

10/27/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page

10/20/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page

10/13/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page

10/6/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • Revised 3rd Quarter Remedial Action Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • Plain Language Summary – 3rd Quarter Remedial Action Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • Fact Sheet # 6 added to the Incident Details (Background of the Issue) page

10/1/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • PA DEP Approval of Interim Site Characterization Report added to the PA DEP Order & Communications page

9/23/26 – New Documents Added

  • 3rd Quarter Remedial Action Progress Report added to the Remedial Action Plans & Other Technical Documents page

9/22/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page

9/15/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page

9/8/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page

9/1/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • PA DEP - Approval of 2nd Quarter Remedial Action Progress Report - 8-31-26 added to the PA DEP Order & Communications page

8/26/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • Right-of-Way Drilling Notice Letter 8-20-26 added to the PA DEP Order & Communications page

8/18/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • PA DEP Approval of Air Monitoring Plan and Addendum – 8-19-26 added to the PA DEP Order & Communications page

8/11/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • PA DEP – Response to Comments to MIPC Perimeter Air Monitoring Plan – 8-7-26 added to the PA DEP Order & Communications page

8/4/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • Responses to Public Comments and Questions on the Interim Site Characterization Report added to the PA DEP Order and Communications page

7/28/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page

7/21/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • Fact Sheet Number 5 added to the Incident Details (Background of the Issue) page

7/14/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • July 7th public meeting video and presentation added to the Public Meeting page

7/8/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page

6/30/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • UPDATED Fence Line Monitoring Plan added to the Remedial Action Plans & Other Technical Documents page

6/23/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • 2nd Quarter Remedial Action Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • Plain Language Summary - 2nd Quarter Remedial Action Progress Report added to the Remedial Action Plans & Other Technical Documents page

6/19/26 – New Documents Added

  • 2nd Quarter Site Characterization Report added to the Public Comment page and Remedial Action plans and Other Technical Documents page.
  • Plain Language Summary 2nd Quarter Site Characterization Report added to the Public Comment page and Remedial Action plans and Other Technical Documents page.

6/16/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • July 7th Virtual Public Meeting Flyer added to the Public Meeting page

6/9/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • PA DEP - Approval of Air Monitoring Plan Addendum – 6-3-26 added to the PA DEP Order and Communications page

6/2/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page

5/26/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • PA DEP - Approval of Water Sampling and Analysis Plan - 5-15-26 added to the PA DEP Order and Communications page
  • PA DEP - Approval of 1st Quarterly Remedial Action Progress Report - 5-18-26 added to the PA DEP Order and Communications page

5/20/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page

5/13/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • 5-11-2026 MIPC Fact Sheet Cover Letter added to the PA DEP Order & Communications page
  • MIPC Fact Sheet 4 added to the Incident Details page

5/6/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • 5-1-2026 MIPC Statement added to the PA DEP Order & Communications page
  • 5-5-2026 Neighbor Letter – Sorry we missed you added to the PA DEP Order & Communications page

4/28/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • 4-27-26 Community Notification Letter - Front Yard Work added to the PA DEP Order & Communications page

4/21/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • PA DEP Letter of Deficiency for the Private Drinking Water Well Sampling and Analysis Plan - 3-31-26 added to the PA DEP Order & Communications page
  • Passive Fenceline Air Monitoring Modification Request to PA DEP – 4-9-26 added to the PA DEP Order & Communications page
  • MIPC Air Monitoring Plan - DEP Response to Comments - 4-10-26 added to the PA DEP Order & Communications page
  • PA DEP Approval of Site Characterization Work Plan – 4-16-26 added to the PA DEP Order & Communications page
  • Revised Private Well Sampling & Analysis Plan - Response to PA DEP Letter of Deficiency - 4-17-26 added to the PA DEP Order & Communications page

4/14/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page

4/7/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page

3/31/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page

3/24/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • First Quarterly Remedial Action Progress Report added to the Remedial Action Plans & Other Technical Documents page

3/17/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • Response to Comments and Addendum to the Fenceline Perimeter Air Monitoring Plan added to the Remedial Action Plans & Other Technical Documents page

3/10/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • Fact Sheet #3 added to the Incident Details page
  • Public Involvement Plan added to the Public Involvement Plan page
  • PA DEP - Approval of Public Involvement Plan added to the PA DEP Order & Communications page
  • PADEP IRA AND VI Plan Approval Letter 3-4-26 added to the PA DEP Order & Communications page
  • PADEP Approval of the Remedial Action Implementation Schedule - 2-26-26 added to the PA DEP Order & Communications page
  • 03.10.26 Fact Sheet #3 Letter added to the PA DEP Order & Communications page
  • 03.10.26 Sound Barriers Letter added to the PA DEP Order & Communications page

3/3/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page

2/25/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • Site Characterization Work Plan added to the Remedial Action Plans and Other Technical Documents page
  • Plain Language Summary – Site Characterization Work Plan added to the Remedial Action Plans and Other Technical Documents
  • MIPC Response to Comments and Transmittal of Revised Remedial Action Implementation added to the PA DEP Order & Communications page
  • 2-20-26 Community Notification Letter - Project Work Ongoing added to the PA DEP Order & Communications page

2/18/26 – New Documents Added

  • MIPC Chelsea Aston Weekly Progress Report added to the Remedial Action Plans & Other Technical Documents page
  • PADEP Letter of Deficiency for the Public Involvement Plan added to the Communications between PADEP and MIPC page
  • MIPC Response Letter – PADEP Letter of Deficiency for the Public Involvement Plan added to the PADEP Order & Communications page

2/10/26 – New Documents Added

  • Private Drinking Water Well Sampling and Analysis Plan added to the Remedial Action Plans and Other Technical Documents Page
  • MIPC Chelsea Aston Latest Weekly Progress Report added to Remedial Action Plans and Other Technical Documents Page
  • February 4th Public Meeting Video added to the Public Meeting Page
  • Public Meeting Presentation Materials added to the Public Meeting Page
  • MIPC Remedial Action Implementation & Target Completion Schedule - PA DEP Response – 2/3/26 added to the PA DEP Order & Communications Page

2/3/26 – New Documents Added

  • MIPC Chelsea Aston Latest Weekly Progress Report added to Remedial Action Plans and Other Technical Documents Page
  • MIPC Air Monitoring Plan - DEP Response -1-30-26 added to PA DEP Order & Communications Page

1/27/26 – New Documents Added

  • MIPC Chelsea Aston Latest Weekly Progress Report added to Remedial Action Plans and Other Technical Documents Page
  • MIPC Chelsea Action Remedial Action Implementation Target Completion Schedule added to Remedial Action Plans and Other Technical Documents Page
  • Second Fact Sheet added to Incident Details Page
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