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Martinez, Genesis [EHD] From: Andrew Francis <afrancis@lsce.com> Sent: Thursday, May 26, 2022 2:16 PM To: ehsitemitigation [EHD] Cc: Gregory Gibson; Shih, Steven [EHD]; Eddy Teasdale; ggebhardt@ci.lathrop.ca.us; rodb@bradleyandsonsdrilling.com Subject: FW: Lathrop Test Well Permit Attachments: Work Plan.zip; Site-Mitigation-Well-and-Boring-Permit-Application-20220525.pdf CAUTION:This email is originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. Hi Jeff, Please see my responses below in red. The updated work plan and signed well permit application are attached. Thanks, Andrew From: ehsitemitigation [EHD] <ehsitemitigation@sigov.org> Sent:Thursday, May 19, 2022 5:20 PM To: Gregory Gibson <ggibson@ci.lath rop.ca.us>;Andrew Francis<afrancis@lsce.com>; ggebhardt@ci.lathrop.ca.us Cc: Eddy Teasdale<eteasdale@lsce.com>; rodb@bradlevandsonsdriIling.com; Shih, Steven [EHD] <sshih@slgov.org> Subject: RE: Lathrop Test Well Permit Gregory, Glenn,Andrew: The EHD has reviewed your work plan to install 3 nested monitoring wells in one 12-inch boring,for the purpose of eventually installing an Aquifer Recharge Well (ASR)well to inject water into the groundwater aquifer.The EHD has quite a few concerns regarding these wells that need to be addressed before EHD can move on to approving it: 1) Please provide document from State Water Resources Control Board which has authority over any ASR projects, that they have no objection to installing these monitoring wells for the purpose of future ASR - The purpose of the monitoring well is to first determine if an ASR project is feasible in this area. If the results from this initial investigation identify subsurface conditions that could support a future ASR project,then the City will initiate a discussion with SWRCB 2) EHD has concern with location of the monitoring wells if they're too close (10', 10 yards?)to the future ASR well. When monitoring wells are to be destroyed, cement grout will have to be placed/pumped into the well casings and the gravel/sand packs under possibly tremendous pressure. Given enough pressure the grout may have an adverse effect on any nearby wells. Please discuss how to mitigate this possibility(i.e. further distance between the MW and the ASR well?) - ASR well and monitoring well will be at least 30 feet apart.At present,there are not plans to destroy this well. 3) EHD requires Stove Pipe be installed instead of a traffic box - Stove pipe will be used. Monitoring well specifications have been added to work plan (Attachment B). See well specification included in updated work plan. Section 2.3.9 1