Friday, November 27, 2009

North Indian Bend Wash Superfund Site update: small spill

From an email from Rachel Loftin, the EPA's Project Manager -
Dear NIBW Community Involvement Group -

I am sending this to let you know of a release of untreated water which occurred on Monday, November 23rd, from a drain pipe which is connected to the groundwater extraction and treatment system of the Central Groundwater Treatment Facility (CGTF).

Here's what EPA has learned from the City of Scottsdale:

First, and most importantly, we want you to know that the release did not impact the drinking water supplied by the Central Groundwater Treatment Facility (CGTF).

On Monday, November 23rd, a release of untreated water was noticed within 10 minutes of turning on well 75. The well and CGTF were shut down as quickly as possible. The release originated at a drain pipe. Between 500-1000 gallons of water was released resulting in an overflow into a retention basin at the adjacent park. The City cordoned off the spill area in the park and collected a soil and groundwater sample. Preliminary groundwater results are 9 micrograms per liter (ug/l) of TCE and 1 ug/l of PCE. These concentrations are quite low.

Because of the short duration of the spill, low volume of water released, and the low detections of TCE and PCE in the spill area, the preliminary data indicates that the public was not impacted by the release.

What happens next?

The City is gathering additional facts and sampling results, and will provide them to EPA early next week. In turn, I will provide the additional information to all of you early next week as well. The City is also developing an incident report with recommendations for next steps which I will pass on to all of you when I receive it.

Please contact me at 415/972-3253 or by e-mail if you should have any questions. In the meantime, I hope everyone had a great Thanksgiving!


Rachel Loftin
Remedial Project Manager
U.S. EPA, Region 9 Superfund Division, SFD-6-2
75 Hawthorne Street
San Francisco, CA 94105
Phone: 415/972-3253
Fax: 415/947-3528
Because the email came through so late on a Friday, I won't be able to follow up on this until Monday at the earliest, and since I have stuff on my schedule already, perhaps not even then.

Anyway, have a good weekend...

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