DRC-2011-001910 - 0901a06880202b37

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DRC- 201 1-00 19
Phillip Goble - DUSA Proposed Correction of GWCLS for pH
From: Phillip Goble
To: Tischler, Jo Ann
Date: 2/14/2011 6:44 AM
Subject: DUSA Proposed Correction of GWCLS for pH
CC: Frydenlund, David; Lundberg, Rusty; Morton, Loren; Roberts, Harold
Jo Ann,
DUSA submitted a letter dated February 1, 2011 proposing a plan to correct the GWCLs for pH for the on-site
monitoring wells. DUSA has previously stated that the data used to calculate a GWCL for Field pH in the
Background Report was actually Lab pH and not Field pH.
DUSA states it will base the revised GWCLs for pH on Field pH collected in monitoring events since 2005 and will
follow the previous approved Flowchart to determine the pH GWCLs. DUSA plans to submit the revised Field pH
GWCLs by the end of the 2"'^ quarter of 2011.
This plan is satisfactory to the DRC; therefore, the DRC will look for the report the end of the 2nd Quarter of
2011 or by June 30, 2011.
If you have any questions please let me know.
Phil
file://C:\Documents and Settings\Pgoble\Local Settings\Temp\XPgrpwise\4D58CF69EQD... 2/15/2011