### Central Maine Power 

### North Augusta Office Annex 

### 41 Anthony Avenue, Augusta, Maine 04330 November 5, 1997 

### Certified Mail - Return Receipt Requested Mr. Ross 

### L. Gilleland, RPM U.S. Environmental Protection Agency Maine and Vermont Superfund Section 

## JFK Federal Building Boston, MA 02203-2211 RE: O'CONNOR COMPANY SUPERFUND SITE MONTHLY PROGRESS REPORT October 1997 -No. 83 DearMr. Gilleland: 

### Routing: ATS RGL File: (207) 626-9600 730-b'& 

### (207) 626-9633 Environmental & Licensing Technical Services 

# FILE COPY

Please find enclosed three (3) 

### copies ofthe October 1997 Monthly Progress Report for work performed onRemedial Design/Remedial Action activities for the O'Connor Company Superfund Site. This submittal is provided in accordance with Section

### XI, Paragraph 30 ofthe Consent Decree betweenthe United States ofAmericaand centralMaine power Company, lodged onDecember7, 1990 and entered on September 3, 1991 andthe Explanationof Significant Differences issuedbythe EPA onJuly 11, 1994. Three (3) 

### copies ofthis progress report have also been forwarded to Wilkes Harper ofthe Maine Department ofEnvironmental Protection and Mary Pothier ofCDMFederal Programs Corporation. 

# s?DJ¢.1!

Normand G. Michaud, P.E. Project Coordinator NGM:lhr 

### bee: Enclosure cc: Wilkes Harper, MDEP (3 copies) Erin Heskett, USEPA (RAA) 

### W. 

## H. Laubenstein, 

### ill, Esquire D. Mills, CMP (w/o encl.) M. Pothier, CDM Federal Programs (3 copies) 

### I. Murarka, EPRI H. J. Vincent, W&C X:ILHRffRP/OCONNOR/LETIER2.DOC 

## J. Pellechia, Katahdin Analytical 

## J. Fougere, TSA Roy Lane, CMP C. Martin, Clean Harbors 

## J. Sturgeon, SDS M. R. Smith, CMP D. Roy, SafeTech 

## J. Fordham, W&C E. Carlson, W&CMONTHLY PROGRESS REPORT NO. 83 October 1997 O'Connor Company Superfund Site Augusta, Maine
A. WORK PERFORMEDDURING OCTOBER 1997 Source Control CSQ
• Complete on-site excavation, sampling anddisposal ofcontaminated soils. • Complete construction oflagoons and upland marsh. • Close out Stage illwork area. • Complete site restoration Ooam & seed). • installed new monitoring wells MW507 and MW508. • Demobilized on-site laboratory. • Startremoving site fencing. • Start demobilization activities. Management ofMigration (MOM>
• Submitted proposal for MOM design witb June samplingresults on 8/11/97. • Received USEP A draft comments on vacuum enhancedrecovery system 

### data collection and interpretation letter report (June 27, 1997) and MOM comprehensive evaluation (June 1997). Riggs Brook
• Finalized and submitted SAP, Rev. 2, on 10/22
.. • Conducted annual sediment sampling on 10/9 and 10/10. • Conducted additional biota sampling on 10/10. B. SUMMARY OFANALYTICAL DATA GENERATED DURING OCTOBER 1997
• Analytical database is updated weekly. • No data submitted per Ross G. • Final analytical datato be submittedwitb SCRA summary report. C. PLANS AND PROCEDURES COMPLETED DURING OCTOBER 1997
• Final Riggs Brook sediment and biota sampling and analysis plan (Rev. 2). D. IMPORT ANT UPCOMING ACTIVITIES Source Control
• Complete fence removal. • Complete site demobilization activities. • Source Control completion ceremony. • USEPAIMEDEP final site inspection.

### 0'Connor Progress Report #83 Page2 October 1997 Management ofMigration
• Respond to comments onMOM comprehensive evaluationreceived 10/1/97 and develop a new MOM report. • Prepare groundwater monitoring report for September sampling. Riggs Brook
• Remediate and restore 

### areas around sample locations 8004 and 8013 where PCB is greater than 5

### ppm. • Startpreparing sediment andbiota sampling report. 

### E. WORKPROGRESS ONPLANS ORSTUDIES SourceControl Due/Submitted Date

100%SCRA Wetlands construction & 

### monitoring plan Progress 

### 7/9/96
7/25/96

Results ofPhase I 

### investigation July 24, 1997 Panek Property Results ofPhase I 

### investigation July 25, 1997 Brochu and Rodrigue properties Results ofPhase II 

### investigation/Phase III 

### Remediation BrochuProperty October 14, 1997 Results ofPhase II 

### investigation/Phase III 

### Remediation ofRodrigue Property December 15, 1997 SCRA "Close-Out Report'' Field Work Phase II 

### mobilization Limited wetland monitoring Phase II 

### demobilization February 

### 5, 1998

5/5/97 5/15/97 11/30/97 EPA Anproval Date

7/30/96
NeedsEPA approvalO'Connor Progress Report #83 Page3 October 1997 Reports Weekly construction report Punch list due Monday ofeach week Items worked on as identified Draft 

### RA report due 90 days from demobilization (February 1998) Management ofMigration 

### (MOM) Work Plans Due/Submitted Date EPA Aooroval Date Current Groundwater Monitoring SAP,Rev.4

95%MOMRD Incorporating EPA comments received Revised MOM Report Field Work Quarterly Groundwater Sampling December Groundwater Sampling Reoorts Groundwatermonitoring 8th round summary & evaluation report Working on groundwatermonitoring report for September sampling Riggs Brook 3 12/96

Submitted: August II October I, 1997 December 15, 1997

Performed 9/23 & 24/1997 Scheduled: weekofDecember 8

Submitted August II
November 1997

Work Plans Due/Submitted Date EPA Aooroval Date N/A Riggs Brook Sediment and Biota SAP, Rev. I Riggs Brook Sediment and Biota SAP, Rev. 2 (Draft) Incorporating Comments Final Riggs Brook sediment and biota SAP, Rev. 2 4/4/97
Submitted: 7/I7/97 Received USFWS EPA/CDM 5115/97 Comments: 8128/97 Scheduled October 24, I997 Submitted: October 22, I997O'Connor Progress Report #83 Page4 October 1997
Field Work

Reoorts Sediment sampling Biota sampling Additional biota sampling Remediation/Restoration
96 Riggs Brook Sediment Sampling Report 97 Riggs Brook Sediment and Biota Sampling Report 

### F. ISSUES Off-site Source Areas October9& 10, 1997 Sepu.nber25, 1997 October I0, 1997 Scheduled: November 3 

### throughNovember7, 1997
5/13/97 Scheduled: December 1997

• Completed remediation ofBrochuproperty. September2, 1997 September29, 1997 • Completed remediation ofRodrigue property. Source Control Design Issues Awaiting EPA approval ofWetlands Construction andMonitoring 

### Report, submitted

### July25, 1996. Received FWS comments. Received verbal acceptance from USEPA (Ross G.)andwritten acceptance from MEDEP )Wilkes H.) as to tbe cleanup ofsample area 5B (cP AH). No further removal action 

### is required. Management ofMigrationDesign Issues The MOM RD desigu proposal was submitted for EPA review 8/11/97. Received EPA comments 10/0l/97. Working on revised MOM RD proposal. Riggs Brook Design Issues SAP finalized on I0122197. Remediation and restoration at sample locations 8004 and 8013 scheduled for November 3 through November 7, 1997.