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• Lori Duncan [EH] From: Duncan Austin [daustin@waterboards.ca.gov] Sent: Friday, December 02, 2011 2:29 PM To: Tim Miles; Lori Duncan [EH] Subject: Re:Voluntary Cleanup Agreement Site Hi Lori; Nice little cleanup job, but based upon a quick once over of the report, I would not grant an NFA based upon this. confirmation samples show residuals, indoor air levels above screening levels, risk calculations don't look right (they did not provide source of risk numbers, nor default exposure assumptions) . We do not have a low threat closure policy. Thanks for sending this over. Duncan Duncan Austin, P.E. Site Cleanup Program Manager Central Valley Regional Water Quality Control Board >>> "Lori Duncan [EH] " <lduncan@sjcehd.com> 11/29/2011 4:11 PM >>> Hello Tim and Duncan, Any comments on this? Thank you, Lori Lori Duncan, Senior REHS San Joaquin County Environmental Health Department lduncan@sjcehd.com (209) 469-0337 phone (209) 468-3433 fax -----Original Message----- From: John P. Lane [mailto:jlane@leeandpierce.com] Sent: Monday, November 28, 2011 5:52 PM To: Lori Duncan [EH] Cc: Henry, Wayne; Knutson, Kathy Subject: Revised Excavation/Air Sampling Report Lori and Wayne: I previously sent you a revised report because the soil data summary table was an old one and did not include the excavation soil samples. I 'm sending another revised electronic report for your records. I found another error in a table; this time it was a typo in the Risk Summary Table (Table 5) . The stated IUR for benzene was incorrect in the old table and should be 2.9E-5. The calculated Cancer Risk was not affected because those values were calculated using the correct IUR of 2.9E-5, not the incorrect value of 2.9E-6 that was in the old table. Again, to clarify, this was a typographical error, not a calculation error. For hard copies of your report, you can just print out the revised table and replace the old, incorrect table. Thank you for your patience, 1