Pall/Gelman Dioxane vs Old City Landfill - 3D Displays

So what about the 1,4-dioxane in the old City of Ann Arbor landfill?

Here's a 3D foamboard graph of the dioxane levels at the Pall/Gelman site in the late 1990's shortly after Pall Corp bought Gelman Sciences... when the cleanup standard was 77 ppb (loosened from the 3 ppb standard in 1995) compared with the smaller model [right, bottom] of the old City of Ann Arbor landfill dioxane levels at the same scale

Vertical scale: 1 ppb = 0.004 inch, 2000 ppb = 8 inches, or 1 inch = 250 ppb

The Pall/Gelman plume resulted from the company using 850.000 lbs of pure dioxane from 1966 to 1986 and letting an unknown amount of it to get into groundwater affecting hundreds of wells.

The old City of Ann Arbor landfill dioxane came from an unknown source and affected only a handful of wells all but one of which opted to hook up the Ann Arbor municipal water supply.

The Pall/Gelman dioxane plumes continue to spread to who knows where.

The old City of Ann Arbor landfill dioxane plume has been shrinking over time.

The Pall/Gelman dioxane cleanup dumps up to 7 ppb of dioxane into a tributary of Honey Creek upstream from where Ann Arbor gets 80-85% of its drinking water.

The old City landfille dioxane cleanup dumped about 2 ppb of dioxane into the waste water sewer system which is treated at the sewer treatment plant and discharged into the Huron downstream from the last water intake at Barton Pond.

Here are links to more information on the old City landfill dioxane site and cleanup:

http://www.a2gov.org/government/financeadminservices/procurement/Documents/RFP%20818%20Landfill.pdf

http://www.a2gov.org/government/publicservices/systems_planning/Environment/Documents/spu_env_soe2004%20final.pdf page 75

http://www.ci.ann-arbor.mi.us/government/publicservices/systems_planning/Environment/Documents/spu_solidwaste_landfill_revisedhydrogeologicplan_2000.pdf

Link to Google earth mashup comparing the Pall/Gelman plumes to the old city landfill plume