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Page 2 of 3 <br /> Stockton <br /> Good morning Andrew, <br /> I do have a question concerning the monitoring of the wells. Do you purge the wells before you take the <br /> dissolved oxygen concentrations? Are there other measurements that you take when monitoring (as <br /> opposed to sampling) a well? <br /> Vicki McCartney, Senior REHS <br /> San Joaquin County <br /> Environmental Health Department <br /> 1868 East Hazelton Avenue <br /> Stockton, California 95205 <br /> Phone: (209)468-9852 <br /> Email: vmccartnev62)sicehd.com <br /> From: Andrew Dorn rmailto:AndrewD@gtienv.com] <br /> Sent: Tuesday, October 16, 2012 5:06 PM <br /> To: Vicki McCartney [EH] <br /> Cc: Jenny Weese Ray Kablanow <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 1M <br /> Equipment site located at 1245 West Charter Way in Stockton (T0607700794). Due to a limited <br /> budget,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 <br /> and continue monthly injections in well IW-2. <br /> • postpone the quarterly groundwater monitoring for remedial performance until the 1st <br /> quarter of 2013. Preliminary DO monitoring of observation wells OW-1 (down-gradient of <br /> IW-1) and OW-3 (down-gradient of IW-3) has shown a limited rise in oxygen levels(0.58 <br /> and 0.21 mg/L on October 5, 2012, respectively).GTI believes that the short duration of <br /> the interim remedial plan has not allowed the hydrogen peroxide to affect the <br /> groundwater monitoring wells and that a performance monitoring in the 4th quarter would <br /> be a waste of the projects limited budget. <br /> The current budget will allow hydrogen peroxide injections to occur monthly through the <br /> remainder of 2012. A change order has been submitted to the Fund requesting additional monies <br /> for the continuation of the interim remedial plan and implementation of the CAP.As additional <br /> funds are provided, GTI anticipates continuing the interim remedial plan and implementing the <br /> CAP in the first half of 2013.GTI 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 /> 10/18/2012 <br />