SITE INFORMATION AND CORRESPONDENCE FILE 1

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Vicki McCartney [EH] From: Vicki McCartney [EH] Sent: Tuesday, March 03, 2015 2:51 PM To: 'William Little' Cc: Nuel Henderson [EH] Subject: RE: 639/655 West Clay Street Hi Bill, Nuel Henderson and I have reviewed your recommended changes to the sampling schedule that was directed by this department by letter dated 30 January 2015 for Knife River at 639/655 Clay Street in Stockton. Your email below included removing AS-1 and EW-2, and adding MW-813 to the sampling schedule. It also included removing naphthalene and 1,2-DCA from the analyte list for MW-1, MW-2 and MW-29; and removing MTBE from the analyte list for MW-27 We concur that AS-1 and EW-2 may be removed from the sampling list; however we do not approve adding MW-8B to the list of wells to be sampled. MW-8B has a history of being non-detect and is not located down-gradient of MW-1 or MW-2, the two most impacted monitoring wells at this site. Include the analyses of naphthalene and 1,2-DCA for groundwater collected from MW-1, MW-2 and MW-29. Remove the analysis of MTBE from MW-27. The revised sampling schedule is as follows: • MW-1, MW-2, and MW-29—analyze groundwater samples for TPH-g,TPH-d, BTEX, naphthalene and 1,2-DCA; (if naphthalene is not detected in the groundwater, it can be omitted from future sampling events.) • MW-27—analyze groundwater samples for TPH-g and BTEX; • MW-9, MW-10, MW-11B and MW-28—analyze groundwater samples for MTBE; and • MW-14B—analyze groundwater samples for MTBE and 1,2-DCA. Please contact me if you have concerns about the new sampling schedule. Vicki McCartney, Senior REHS San Joaquin County Environmental Health Department 1868 East Hazelton Avenue Stockton, California 95205 Phone: (209) 468-9852 Email: vmccartney(q)_sjcehd.com 1