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a Page 1 of 3 Lori Duncan [EH] From : Arron Wilder [AWilder@clearwatergroup.com] Sent: Thursday, July 23, 2009 7 :37 AM To : Lori Duncan [EH] Cc: Olivia Jacobs; James Jacobs; Sandy Young Subject: FW: 1817 Fresno Ave, Collecting samples at iSOC wells Lori - I need to clarify , since there are several competing planning issues for this site: Quarterly Monitoring The last sampling event was March . The SWRCB has changed the requirement from 4 events per year, to 2 events per year. According to this change, the next sampling event would occur in or around September. Based on the rebound sampling timing , October would be appropriate for the second sampling of the year. Groundwater Monitoring Wells Sampled AS-1 , MW-5B, MW-7, and MW-8 are the current wells which are sampled , since the number of wells has been reduced . Rebound sampling We do plan on collecting samples after the full 6-month period is complete , in order to determine whether the iSOC units should be re-installed or permanently removed . Collecting samples at the monitoring wells you have indicated ("all site monitoring wells") after the 6-month period will provide important information to have on hand in making this decision . This 'rebound" sampling event would occur in late October. Treatment Wells Sampled We have recently approached you about sampling of non-monitoring wells . Previously, such sampling was not performed because treatment wells are not typically sampled . However, with the system shut off, these wells will not have been treatment wells for 6 months . You had agreed to sampling treatment wells during the rebound sampling even . n your previous ema ,, you ed a sampling—alrofthe-treatment-welts, due to the tack of funding at the USTCF. In response to your comment about considering one treatment well sampling , we had requested sampling of IW-3 ; For purposes of establishing the extent of contamination at the time of the rebound sampling , we would like to propose two other wells (specifically, wells IW-6 and/or IW-7); please note that the treatment wells have never been sampled . We will need your direction regarding which of these non-monitoring wells to sample during the late October 2009 "rebound" sampling event. Please confirm that all of the other details are acceptable to your office. Thank You , Arron Wilder Project Manager Clearwater Group 510-307-9943 - office 510-590-1096 - cell From: Arron Wilder Sent: Tuesday, July 21, 2009 1 : 24 PM To: 'Iduncan@sjcehd.com' Cc: Olivia Jacobs; 'James Jacobs'; Sandy Young Subject: FW: 1817 Fresno Ave, Collecting samples at iSOC wells v9ai9nnv