09/19/2014 - Email response to 4/4/14 Sutton review of EG flow

(9/19/2014 email to CARD Technical Group list from Roger Rayle, chair, SRSW)

Sutton review - follow-up

SWL Elevations by Date - Evergreen Intermediate Layer -- data&chart: https://docs.google.com/spreadsheets/d/1v3whh38GDxgMgt6vYUDCPfTzPMjCFLp0tbG3Mj_kMCY/edit?usp=sharing

The chart shows the variability in the SWL elevations over time... some within days of each other. This means that in order to trust SWL data comparisons, the SWL samples should be taken on the same day (and maybe even with a few hours of each other.)

Of the 119 SWL sampling days Jan-2009 to Mar-2014, only 5 of those days (bolded lines in the spreadsheet) had samples of all available wells for the intermediate aquifer layer in the vicinity of the contamination moving through 465 Dupont and MW-77.

Using the "same day" samples only leaves us with meager SWL results: https://docs.google.com/spreadsheets/d/1V1Iki1ROZKQRdma66KzRbb7TNKd-EA5Sl31izRjTva0/edit?usp=sharing

Nothing in the Sutton review explains how the dioxane got to 465 Dupont. The 465 Dupont data was not provided to Sutton.

Adding in the Pall deep plume map shows conflicting interpretations of the northerly plume's path... Pall's deep plume map seems more consistent with dioxane readings that indicate 465 Dupont's dioxane is moving towards MW-54d and MW-77's is moving towards MW-55 where Sutton's would suggest that 465 Dupont's dioxane would move toward MW-55 which would result in higher concentrations there than at MW-54d, which is contrary to sampling results.

That north/northeasterly flow is consistent with Pall's 2000-2001 deep plume potentiometric flow lines...

Side-by-side comparisons show that intermediate deep plume seems to be moving through 465 Dupont and MW-77 at about the same rate... which would suggest a northeast flow consistent with the Pall-Gelman 2000-2001 flow lines.

Both Sutton's and Pall's deep plume maps suffer from a staggering lack of monitoring wells in the intermediate layer (elevation 720-800) back towards the core to explain how the dioxane is getting to 465 Dupont and MW-77...

That happens to be the same layer in which MW-30d is screened...

​MW-30 is the well that Pall/Gelman failed to sample from Sept 1993 to Jan 2001 even though it was the only deep well east of Wagner prior to 2001... which had 9 ppb in Aug 1993 (3 times the 3 ppb cleanup standard then)... data that is missing in Pall's databases.

Matt, from what you shared in June, I think these are the files Pall shared with Tetratech for the Sutton review. Clearly, Tetratech was provided only a small fraction of the available data/images... and nothing about 465 Dupont.