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Ruvalcaba, Cesar [EHD] <br />From: <br />Tom Oborne <Tom.Oborne@shanwil.com> <br />Sent: <br />Thursday, April 7, 2022 4:04 PM <br />To: <br />EH WellandSepticPermits [EHD] <br />Cc: <br />Steve Diem; Annette Yanez <br />Subject: <br />RE: Drilling Permit Application <br />CAUTION: This email is originated from outside of the organization. Do not click links or open attachments unless you recognize the <br />sender and know the content is safe. <br />Hello, following up on our phone conversation regarding backfill material and methods. <br />Portland cement with 3-5% bentonite gel will be backfilled into the bore hole with tremie pipe for exploration depths <br />exceeding 30' bgs, or if groundwater is encountered. The same mixture will be used to backfill shallow 5' borings and the <br />grout mixture will be placed by free -falling it into the bore hole. <br />Please contact me with any questions. <br />Thank you, <br />Tom Oborne, GIT <br />STAFF GEOLOGIST III <br />=IIISHANNON &WILSON <br />100 North First Street, Suite 200 <br />Burbank, CA 91502 <br />shannonwilson.com <br />Office: (818) 543-4560 <br />Mobile: (818) 331-5032 <br />Tom.Oborne@shanwil.com <br />Please note, my email address has been updated. You can still reach me at two@shanwil.com. <br />From: Tom Oborne <br />Sent: Thursday, April 7, 2022 11:27 AM <br />To: 'ehweIla ndsepticpermits@sjgov.org' <ehwellandsepticpermits@sjgov.org> <br />Cc: Steve Diem <Steve.Diem @shanwil.com>; Annette Yanez <Annette.Yanez@shanwil.com> <br />Subject: Drilling Permit Application <br />Hello, please see attached permit application. <br />Thank you, <br />Tom Oborne, GIT <br />STAFF GEOLOGIST III <br />=11I SHANNON &WILSON <br />100 North First Street, Suite 200 <br />Burbank, CA 91502 <br />shannonwilson.com <br />1 <br />