ALCOA Alcoa Milt Products 4879 State Street PO Box 3567 Bettendorf, IA 52722-8030 USA Tel: 1 563 459 2000 Mr. James Colbert Remedial Project Manager USEPA Iowa - Nebraska Branch Superfund Division Region VII 90 IN 5 th Street Kansas City, Kansas 66101 '- Re: Additional Work - Administrative Order on Consent for Removal Actions and Remedial Investigation Feasibility Study Dear Jim, Alcoa received the subject request for additional soil gas investigation work on Friday September 24, 2004. This letter is to confirm Alcoa's commitment to completing the new tasks requested by EPA under Section XII of the 1995 Consent Order to better characterize the sub-slab soil gas plume located west of the plant on South Bellingham Road. Attachment 1 is a schedule describing when the additional work will be completed. In addition to the work tasks outlined in your letter, door-to-door communication with residents and homeowners was completed over a two-day period including Friday September 17 and Monday September 20, 2004. Alcoa also met with Riverdale City officials on the evening of September 20. The objective of the interactive communication was to answer any questions and respond to concerns that residents have regarding the soil gas findings. Future plans to investigate the source of soil gas and obtain access agreements to install sub-slab ventilation systems were also discussed. Attachment 2 is the work plan for installing sub-slab ventilation systems. The plan consists of a site map, description of general installation procedure, EPA Guidance Document titled "Radon Technology For Mitigators", and ventilation system engineering specification and drawings. An EPA trained and certified technician from a heating and plumbing contractor is installing the ventilation systems. It is anticipated that ventilation systems will be installed in the homes that continued to be occupied after the access agreements are signed.
Transcript
ALCOA
Alcoa Milt Products
4879 State StreetPO Box 3567Bettendorf, IA 52722-8030 USATel: 1 563 459 2000
Mr. James ColbertRemedial Project ManagerUSEPAIowa - Nebraska BranchSuperfund Division Region VII90 IN 5th StreetKansas City, Kansas66101 '-
Re: Additional Work - Administrative Order on Consent for Removal Actions andRemedial Investigation Feasibility Study
Dear Jim,
Alcoa received the subject request for additional soil gas investigation work on FridaySeptember 24, 2004. This letter is to confirm Alcoa's commitment to completing the newtasks requested by EPA under Section XII of the 1995 Consent Order to bettercharacterize the sub-slab soil gas plume located west of the plant on South BellinghamRoad. Attachment 1 is a schedule describing when the additional work will becompleted.
In addition to the work tasks outlined in your letter, door-to-door communication withresidents and homeowners was completed over a two-day period including FridaySeptember 17 and Monday September 20, 2004. Alcoa also met with Riverdale Cityofficials on the evening of September 20. The objective of the interactive communicationwas to answer any questions and respond to concerns that residents have regarding thesoil gas findings. Future plans to investigate the source of soil gas and obtain accessagreements to install sub-slab ventilation systems were also discussed.
Attachment 2 is the work plan for installing sub-slab ventilation systems. The planconsists of a site map, description of general installation procedure, EPA GuidanceDocument titled "Radon Technology For Mitigators", and ventilation system engineeringspecification and drawings. An EPA trained and certified technician from a heating andplumbing contractor is installing the ventilation systems. It is anticipated that ventilationsystems will be installed in the homes that continued to be occupied after the accessagreements are signed.
EPA is requesting that Alcoa communicate the option of indoor air sampling in thehomes prior to installing the ventilation systems. When we last discussed this as a groupon August 31, 2004 and again on September 10, 2004 we agreed to sample homes afterthe ventilation systems are installed and that sampling prior to installing ventilationsystems would be conducted if residents requested it. However, based on your letter thatwas received September 24, 2004, Alcoa will also communicate to residents along SouthBellingham Road that they have the option to request indoor air sampling prior toinstallation of sub-slab ventilation systems.
Finally, Alcoa received the preliminary results from the indoor air sampling andadditional sub-slab sampling. See Attachment 3 for more detail. The preliminary datafrom the additional sub-slab sampling at the new Yankee Plastic facility located behindseveral of the homes on South Bellingham Road indicated that soil gas concentrationsbeneath the slab are significantly less than what is detected beneath the homes at issue.Specifically values beneath the Yankee Plastic slab ranged from 2.4 ug/m3 - 2.8 ug/m3whereas the values beneath 240 and 226 South Bellingham Road ranged from 160 ug/m3- 710 ug/m3 and 6.9 ug/m3 - 7.4 ug/m3 respectively. 240 South Bellingham is locateddirectly adjacent to and east of the new Yankee Plastic Slab. 226 South Bellingham islocated to the north and east of the Yankee Plastic slab. The soil gas data indicates thatthe soil gas plume is limited. Therefore, we would like to discuss with EPA the need foradditional groundwater and soil gas investigations.
Sincerely
Bud SturtzerAlcoa Remediation
Attachment 1
Schedule
Task Description
Indoor air sampling at houses located at226 and 240 South Bellingham Road
Indoor air sampling at potentiallyimpacted houses as required
Define extent of contamination associatedwith groundwater vapors in the vicinity ofthe South Bellingham Road area
Development of work plan for indoor airsampling
Development of work plan forinvestigation to determine extent ofcontamination
Development of work plan for installationof ventilation systems in houses
Start
9-23-04
TBD
9-23-04
9-18-04
9-18-04
9-3-04
End
9-24-04
TBD
TBD
9-28-04
TBD
9-23-04
Comment
Preliminary results being validated.
TBD after contacting residents living inS. Bellingham homes. Access letter willbe sent with option to sample indoor air.
Preliminary results show Yankee Plasticsub-slab data west of 240 S. Bellinghamsignificantly less than concentrationsfound at 240 S. Bellingham.
EPA approved work plan via e-mail on9-28-04
Preliminary results show Yankee Plasticsub-slab data west of 240 S. Bellinghamsignificantly less than concentrationsfound at 240 S. Bellingham.
Two systems installed at Alcoa ownedhomes 240 and 226 S. Bellingham. Theobjective is to secure access agreementto ventilate all occupied homes alongSouth Bellingham Road.
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Attachment 2 SUPStftoMD BjV331Q?S
Sub-slab Ventilation System InstallationWork Plan
Note:
1. Ventilation systems will be provided at Alcoa expense to all households on SouthBellingham Road within a reasonable timeframe of securing access agreement.
2. Attachment 2 "Sub-slab Ventilation System Installation Work Plan" also containsa site photograph, installation procedures, engineering specifications, and EPAGuidance on installing ventilation systems.
3. Installation of ventilation systems will be done at the direction of an EPA trainedand certified professional.
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Legend
<0» Subslab Gas Sample
Figure 1
Sept 2004 Sampling Locations
Alcoa-Davenport Works
Sub-slab Ventilation Installation Procedure*
Outdoor
• Mount Level 2 electric fan and housing to side of house (see picture for detail)
• Hammer drill 4" diameter hole through basement concrete slab
• Connect 4" diameter PVC pipe from hole in basement slab to exterior fan housing
• Seal PVC pipe connection around 4" hole in basement slab
• Seal cover over sump pump to minimize or eliminate potential vapor intrusionthrough sump
• The basements should be ventilated for a couple days prior to post ventilationtesting to let the seals fully cure at the door, the pit lids, and the floor suctionpoints.
*Refer to EPA Guidance "Radon Technology For Mitigators" and equipmentspecification sheets for more detail.
Work to install the ventilation system is conducted by a EPA certified radon gas mitigator(Steve Breitkreuz, Ace Plumbing and Heating, St. Joseph Michigan 49805)
Attachment 2Ventilation System Work Plan
Ventilation System Specifications
Ace Plumbing & Heating of St. Joseph, Inc.
DATE:
TO:
ATTN:
FROM:
2724 NILES AVENUE, ST. JOSEPH, Ml 49085PH 269-983-6353 - PAX 269-983-01 08
Total Pages (including cover sheet)
MESSAGE:
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