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• . Page 1 of 3 <br /> • Vicki McCartney [EH] <br /> From: Vicki McCartney [EH] <br /> Sent: Thursday, October 18, 2012 8:43 AM <br /> To: 'Andrew Dorn' <br /> Cc: Ray Kablanow; Jenny Weese <br /> Subject: RE: Interim Remedial Plan Changes-JM Equipment Site- 1245 W. Charter Way, Stockton <br /> Good morning Andrew, <br /> Thank you for responding to my questions. <br /> will prepare a letter approving changes to the interim remedial plan for JM Equipment at 1245 W. <br /> Charter Way in Stockton that include: <br /> • Monthly injections of hydrogen peroxide into IW-1 and IW-3 instead of twice a month; and <br /> • Omitting the fourth quarter 2012 groundwater monitoring for remedial performance purposes. <br /> The letter should be sent within the week. <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: vmccartnevno.sicehd.com <br /> From: Andrew Dorn [mailto:AndrewD@gtienv.com] <br /> Sent: Wednesday, October 17, 2012 5:10 PM <br /> To: Vicki McCartney [EH] <br /> Cc: Ray Kablanow; Jenny Weese <br /> Subject: RE: Interim Remedial Plan Changes -JM Equipment Site- 1245 W. Charter Way, <br /> Stockton <br /> Hello, <br /> The DO measurements for OW-1 and OW-3 mentioned in the initial email were collected using a <br /> down-hole DO probe. The DO probe was the same one used to measure the DO in ORC well IW-1 <br /> during the hydrogen peroxide injection event that you oversaw on August 1, 2012. No purging of <br /> the well was involved.The probe was calibrated on site and lowered into the well to a depth of <br /> 20' bgs(GW was 13' bgs and the well had a total depth of 25'). <br /> Typically when we monitor a well (versus sampling),we collect DTW and TD measurements, <br /> purge 3 casing volumes and record GW parameters initially and following each of the 3 purge <br /> volumes.The GW parameters include DO,ORP,Temp, pH and EC. In summary, monitoring a well <br /> is basically the same as sampling a well, except that no GW samples are collected for lab analysis. <br /> From: Vicki McCartney [EH] [mailto:vmccartney@sjcehd.com] <br /> Sent: Wednesday, October 17, 2012 10:30 AM <br /> To: Andrew Dorn <br /> Subject: RE: Interim Remedial Plan Changes -JM Equipment Site - 1245 W. Charter Way, <br /> 10/18/2012 <br />