From: KENT Mavis D

Sent: Mon Dec 21 16:36:44 2009

To: 'Sarah Prowell'; Chris Kimmel

Subject: Semiannual Performance Report for TSA

Importance: Normal

I have reviewed the Semiannual Performance Report: April 1 through September 30, 2009 Troutdale Sandstone Aquifer Remedy dated December 14, 2009. Table 2-1 lists the current monitoring schedule with suggested changes in bold. The only changes highlighted in the text is to change frequency from annual to every other year (represented on the table by annual/once per 2 years). There are other wells with similar format for water quality sampling frequency (such as EW-11, BOP-70(ds-215), BOP-71(ds) and MW-19(ds)) but that do not seem to be in bold or discussed in the text. Were these changes already approved? If so, then the first frequency should be removed.

I had no other comments on this report.