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SANDUSKY, OH – The Keller Building Tour

June 2, 2009

KellerRFPanalysis511_Page_01

The Keller Building Proposals were presented by Ruth and Bob Haag to the Sandusky City Commission at the beginning of May. The Commission voted to go ahead with the David Williams proposal.

Keller Building Tower

Keller Building Tower

1. A Phase I assessment was already performed, by Environmental Design Group (EDG), for the Keller, Chesapeake and Tricor properties.

Haag Environmental Company (http://www.haagenviro.com/)

2. A Phase II assessment was also already performed, by EDG, for the Keller, Chesapeake and Tricor properties.  The Phase II assessment identified TCE and associated vapor intrusion as a hazard for people who would live in the Keller building.

3. The Keller, Chesapeake and Tricor studies identified the TCE plume as originating off any of the three study sites (Keller, Chesapeake, Tricor).  Those studies provided HaagEnviro with enough data to draw the plume, however.  We can clearly see that the plume centers on the Decatur Street parking lot, next door to the Keller building.

4. The Brownfields Committee, led by HaagEnviro, recommended that the City use its USEPA grant to pay Partners Environmental to do a Phase I assessment of the Decatur Street parking lot.  Partners Environmental is now executing that Phase I study.

5. Following the Decatur Street parking lot Phase I assessment, the Brownfields Committee has recommended that Partners should perform a Phase II study on the Decatur Street parking lot.

6. Following the Phase II assessment, the Brownfields Committee will likely recommend that Partners should prepare a Remedial Action Plan (RAP), for a remedial system to remove the TCE source in the Decatur Street parking lot.

7. The City will use the RAP to apply for a cleanup grant, possibly from the Clean Ohio Assistance Fund (COAF).  If awarded, this COAF grant will then be used to hire contractors to install a TCE remedial system, most likely a soil vapor extration (SVE) system, or an air-sparging system, or both.  These remedial systems may extend off of the parking lot, out to the adjacent Keller, Chesapeake and Tricor properties.

8.  Once the TCE source is removed from the Decatur Street parking lot and adjacent areas, the Keller building will no longer have the potential to cause people living there to be exposed to TCE.

Best regards,

Bob Haag, Vice President and Principal Hydrogeologist

Haag Environmental Company (http://www.haagenviro.com/)

Is there a risk to pedestrians?

- Correspondence with Haag Environmental Company.

There is effectively no risk for pedestrians walking around the Keller building or Tricor property, because there is plenty of open space and air movement to dilute the TCE and to carry it away.

The issue arises inside the Keller building, where the vapors can seep in, and be contained.  One of the City’s prior consultants performed indoor air modeling studies, using the Johnson & Ettinger (J&E) model.  This model takes the values found in the subsurface, and predicts what concentrations will result inside the overlying building.  The J&E modeling led the consultant to conclude that the contaminant levels inside the Keller building would be unacceptable, so that some form of interceptor system would be required.

As you know, we have planned to install either an inteceptor system or, better yet, to completely remove the source of the TCE and associated contaminants.

Best regards,

Bob Haag, Vice President and Principal Hydrogeologist

TCE Plume _Page_19TCE Plume _Page_22


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