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Angelica Sandoval Marin [EH] From: Scott <SBittinger@stratusinc.net> Sent: Thursday, September 18, 2014 11:26 AM To: Angelica Sandoval Marin [EH] Subject: RE: 1140 W. Hammer Lane, Stockton Basically, on the 241h & 25th, we will be sampling 102 S. Wilson Way (18 wells) and 1140 W. Hammer(3 wells). I would expect the Wilson Way work to take 1.5 days, and the Hammer Lane work to only take 3 hours or so. If you want exact times, call Carl Schulze at 805-712-6375, as he will be the one doing the work. Scott. From: Angelica Sandoval Marin [EH] [mailto:amarin@sjcehd.com] Sent: Thursday, September 18, 2014 11:21 AM To: Scott Subject: RE: 1140 W. Hammer Lane, Stockton Scott, Please let me know date and time that tech will be on site. Thanks Angelica Angelica Sandoval Marin, Senior REHS San Joaquin County, Environmental Health Department 1868 E. Hazelton, CA 95205 (209)468-2807 desk (209)468-0341 fax Email: amarin@sicehd.com From: Scott [maiIto:SBittinger@stratusinc.net] Sent: Thursday, September 18, 2014 11:10 AM To: Nuel Henderson [EH] Cc: cori.condon@waterboards.ca.gov; Angelica Sandoval Marin [EH] Subject: RE: 1140 W. Hammer Lane, Stockton The 3 d quarter sampling event will be performed next week. It is really hard to evaluate ozone injection on the basis of`remedial efficiency', unlike vapor extraction or DPE. With ex- situ techniques, if you drop from 60 lbs/day to 6 lbs/day recovery, the decline is apparent. In this case,we are using data from only a few wells sampled once every three months to evaluate performance in-situ. Harlin Knoll verbally told me, when we designed the cleanup plan 2+years ago, that he thought that the case was a good closure candidate even before remediation started, because the plume was stable and relatively small. But the high level of benzene in MW-11 at the time prevented low threat closure. Thus the groundwater data from one well was used as the basis for starting remediation, and now data from this well and new well MW-12 (which was added to provide an additional data point) are really the only data points being used to evaluate remedial performance.