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8/3/2018 <br /> SquirrelMail <br />Subject: RE: General Dynamics OTS, SWMU21, Tracy, CA - Work Plan for New Monitoring Well <br />From: "Sun, Yongsheng@DTSC" <Yongsheng.Sun@dtsc.ca.gov> <br />Date: Tue, July 10, 2018 11:16 am <br />To: "lisa@choweng.com" <lisa@choweng.com> <br />Cc "Aarons, Jerry@DTSC" <Jerry.Aarons@dtsc.ca.gov>, "Cristal.Burford@gd-ots.com" <cristal.burford@gd- <br />ots.com>, "elaine.mills@gd-ots.com" <elaine.mills@gd-ots.com> <br />Priority: Normal <br />Good day, <br />DTSC and DTSC's GSU has reviewed the June 2018 revised Additional Monitoring Well <br />Work Plan, Solid Waste Management Unit No. 21, Tracy Test Facility, 32727 Corral <br />Road, Tracy, California (submitted July 2018). The revised work Plan adequately <br />addresses previous comments. DTSC doesn't have any additional comments or edits to <br />recommend. DTSC, hereby, approves the June 2018 revised Additional Monitoring Well <br />Work Plan. <br />Currently, I am updating EnviroStor schedule for fiscal year 07/2018 to 06/2019. I <br />would be greatly appreciated if you could provide me an approximate schedule of any <br />planned field activities and document that needed DTSC's review. <br />Warmest Regards, <br />Yongsheng "Johnny" Sun <br />Project Manager <br />DTSC Site Mitigation Program <br />Work: (510) 540-3872 <br /> Original Message <br />From: Lisa Kimura [mailto:lisa@choweng.com] <br />Sent: Monday, July 09, 2018 7:49 PM <br />To: Sun, Yongsheng@DTSC <Yongsheng.Sun@dtsc.ca.gov > <br />Cc: Aarons, Jerry@DTSC <Jerry.Aarons@dtsc.ca.gov >; Cristal.Burford@gd-ots.com; <br />elaine.mills@gd-ots.com <br />Subject: RE: General Dynamics OTS, 5WMU21, Tracy, CA - Work Plan for New Monitoring <br />Well <br />Good day, <br />On behalf of General Dynamics OTS, attached please find the revised Work Plan for <br />the additional well at the SWMU21 site in Tracy, CA. We have revised page 4 to <br />indicate waiting 72 hours between well installation and development. We have also <br />included a stamped signature page at the end of the plan from Dani Renan the PG. <br />Please let us know if you have any questions. <br />Regards, <br />Lisa Kimura <br />Chow Engineering, Inc. <br />510-636-8500 <br />On Tue, July 3, 2018 11:34 am, Sun, Yongsheng@DTSC wrote: <br />Hi Lisa, <br />DTSC agrees with drilling methods proposed, as well as the location <br />and depth of the boring/well and the well construction design. <br />Two comments: <br />1) Wait 72 hours between installing the well and well development. <br />(first sentence of 2nd paragraph on top of page 4). Thus allowing the <br />cements enough time to set-up and to cure. 2) Please have a project proponent P.G. <br />stamp on the work plan per California Code of Regulation. <br />Also, for drilling - the use of the high torque hollow-stem auger <br />https://box759.bluehost.com:2096/cpsess8391636290/3rdparty/squirrelmail/src/read_body.php?account=0&mailbox=INBOX&where=search.php&what... 1/2