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From: Lor Xiong [[H] [mailto:Ixiong@sjcehd.com] <br />Sent: Monday, October 16, 2017 11:35 AM <br />To: andrew@terraxenv.com <br />Subject: 520 N El Dorado St. <br />Hi, <br />After reviewing all the documents we received for the boring destructions at 520 N. El Dorado I have a few <br />questions. On the work plan (Task 2: Well Abandonment) it said B-1, B2, B3, B5 and B-6. Is it B5 or B4 that is going to be <br />destroyed? The email sent to Michael Kith stated that there were no soil probes constructed in soil boring B5. Another <br />concern during the review is in section 3.0 Permitted Site Investigation which stated that B5 was advanced to refusal at <br />a depth of 7 feet bgs and sample reports recorded depths as 10 feet bgs. Was B5 grouted or backfill with natural <br />soil? B5 must be located, over-drilled, grouted with neat cement to the total depth as stated in the work plan if <br />bentonite or natural soil was used to back filled. <br />Thanks, <br />Lor Xiong, REHS <br />San Joaquin County Environmental Health Department <br />1868 E. HazeIton Ave. <br />Stockton, CA 95205 <br />lxiong@sicehd.com <br />(209) 468-2807 <br />2