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Rancho Gold Canal Drive,Suite 100 Rancho Cordova,California 95670 PH 916.637.8048 consultants www.geosyntec.com September 18,2024 San Joaquin County Environmental Health Department 1868 East Hazelton Avenue Stockton, CA 95205 Subject: Well Destruction Permit Application Rough and Ready Island, Port of Stockton, Stockton, CA 95203 To Whom It May Concern: On behalf of the Port of Stockton, Geosyntec Consultants, Inc. (Geosyntec) has prepared this cover letter and well destruction permit application to detail the proposed destruction of one monitoring well,W-282, at Rough and Ready Island (APN 16-203-007). In accordance with the Final Remedial Action Plan for Soil, Site 47 (Site 47 RAP), prepared by Geosyntec and dated October 2023, monitoring well W-282 is planned to be destroyed ahead of Site re-development for commercial/industrial use. The well destruction will be conducted by Confluence Technical Services, a C-57 licensed drilling contractor, working under the supervision of a California licensed professional geologist. The well will be destroyed by overdrilling with a hollow stem auger (HSA) drill rig. The HSAs will be advanced to the total well depth using an auger diameter greater than the original well borehole and the well materials removed from the subsurface. Once the well materials have been removed, the borehole will be tremie grouted with Portland cement grout from the bottom of the borehole to 5 feet bgs. In accordance with the California Well Standards, the top 5 feet bgs will be backfilled with native soil. The soil cuttings and well casing removed from the ground as part of the well destruction activities will be stored in drums or bins and will be handled as investigation derived waste (IDW). The IDW will be sampled and profiled, and the material will be transported off-site for disposal at an appropriate disposal facility. Please find the enclosed well permit application package. Included in this application package are the following: • Attachment 1 — Well and Boring Permit Application for Rough and Ready Island including application form, well construction table, map, Confluence Environmental C-57 license contractor declaration,and on-line permit application payment. • Attachment 2—Final Remedial Action Plan for Soil, Site 47; • Attachment 3—DTSC Conditional Approval of the Site 47 RAP; and • Attachment 4—CVRWQCB Approval of the Site 47 RAP. engineers I scientists I innovators