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• Page 1 of 1 <br /> Vicki McCartney [EH] <br /> From: Andrew Dorn [AndreWD@gtienv.coml <br /> Sent: Tuesday, October 16, 2012 5:06 PM <br /> To: Vicki McCartney [EH] <br /> Cc: Jenny Weese; Ray K9blanow <br /> Subject: Interim Remedial Plan Changes-JM Equipment Site- 1245 W. Charter Way, Stockton <br /> Good Afternoon, <br /> I am contacting you in regards to the interim remedial plan currently being implemented at the JM <br /> Equipment site located at 1245 West Charter Way in Stockton (T0607700794). Due to a limited budget, <br /> GTI would like to request the following changes to the interim remedial plan: <br /> • reduce hydrogen peroxide injections from bi-monthly to monthly in wells IW-1 and IW-3 and b <br /> continue monthly injections in well IW-2. <br /> • postpone the quarterly groundwater monitoring for remedial performance until the 1st quarter <br /> of 2013. Preliminary DO monitoring of observation wells OW-1 (down-gradient of IW-1)and <br /> OW-3(down-gradient of IW-3) has shown a limited rise in oxygen levels(0.58 and 0.21 mg/L on <br /> October 5, 2012, respectively). GTI believes that the short duration of the interim remedial plan <br /> has not allowed the hydrogen peroxide to affect the groundwater monitoring wells and that a <br /> performance monitoring in the 4th quarter would be a waste of the projects limited budget. i <br /> The current budget will allow hydrogen peroxide injections to occur monthly through the remainder of <br /> 2012.A change order has been submitted to the Fund requesting additional monies for the continuation <br /> of the interim remedial plan and implementation of the CAP. As additional funds are provided, GTI <br /> anticipates continuing the interim remedial plan and implementing the CAP in the first half of 2013. GTI <br /> is currently preparing the Corrective Action Plan. <br /> Please let me know if you have any questions or concerns. <br /> Thank you, <br /> Andrew Dorn <br /> 4 - Geological Technics Inc. <br /> 1172 Kansas Ave <br /> Modesto, CA 95351 <br /> (209)522-4119 <br /> andrewd@atienv.com <br /> gti@gtienv.com <br /> 10/17/2012 <br />