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�o nuin. SAN J OAQ U I N Environmental Health Department COUNTY Linda Turkatte, REHS, Director C, '91" Greatness grows here. Kasey Foley, REHS,Assistant Director PROGRAM COORDINATORS Robert McClellon, REHS Jeff Carruesco, REHS, RDI Michael Kith, REHS Willy Ng, REHS Muniappa Naidu, REHS August 5, 2019 MEMORANDUM TO: Sean Roddy Hennings Bros. Drilling p, FROM: Linda Turkatte, Director .1,w/ Environmental Health Department SUBJECT: Well Destruction — 28488 S. Bird Rd., Tracy Attached is the approved permit for the destruction of the well installed on July 30, 2018. This well was drilled to 420 feet and originally had a bentonite slurry annular seal to 210 feet, approximately 12 feet into the Corcoran Clay layer. The casing of this well collapsed near the time of installation. A Well Destruction Permit application was submitted to the Environmental Health Department on April 9, 2019 with a proposal to pump bentonite slurry from the bottom of the well to the surface. The Environmental Health Department requested the well be destroyed by perforation and backfill with cement from bottom of the well to the surface. At a meeting on August 2, 2019, destruction methods were proposed for this well and were evaluated by two third-party reviewers selected by the County Administrator. At this meeting, it was agreed to destroy the well as follows: • Removal of the Casing o The well casing will be removed from approximately 230 feet to surface. o Sufficient casing must be removed to ensure a sufficient seal at least 10 feet into the Corcoran Clay layer. o The well and borehole will be filled with water to provide hydraulic pressure to prevent any borehole collapse during the casing removal process. o After casing removal and prior to cement sealing material, the borehole will be measured to ensure no borehole collapse has occurred. • Backfilling of the Well/Borehole o The well/borehole will be filled with cement from bottom using a tremmie pipe. o If a tremmie pipe cannot access the full depth of the well, the cement sealing material will be placed from the maximum depth accessible but at least from a depth that ensures the borehole is sealed at least 10 feet into the Corcoran Clay layer. Should borehole collapse occur during this operation, all collapsed materials shall be cleared from the well and cement seal placed with tremmie pipe from the bottom of the well to the surface. Please notify EHD prior to the start of any work on the well destruction. Let me know if you have any questions. 1868 E. Hazelton Avenue I Stockton, California 95205 1 T 209 468-34201 F 209 464-0138 1 www.sjcehd.com