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Geosynte& Rancho Gold Canal Drive,Suite 100 Rancho Cordova,California 95670 PH 916.637.8048 consultants www.geosyntec.com 3 November 2022 San Joaquin County Environmental Health Department 1868 East Hazelton Avenue Stockton, CA 95205 Subject: Well Destruction Permit Addendum Rough and Ready Island, Port of Stockton, Stockton,CA 95203 To Whom It May Concern: On behalf of the Port of Stockton, Geosyntec is planning to re-install one well at Rough and Ready Island (APN 16-203-007). The well labeled as PMW-1 was installed on October 7, 2022, but complications arose during well development, and a surge block became lodged in the well screen. The surge block remains stuck inside the well casing, which prevents proper sampling of the well. The well will be destroyed and re-installed to allow for proper sampling. Destruction of PMW-01 PMW-0I will be overdrilled using the hollow stem auger(HSA) drilling method to the total well depth of 23 feet below ground surface(ft bgs)using an 8-inch auger. Once the well materials have been removed, the borehole will be tremie grouted with Portland cement grout under inspection by SJCEHD from the bottom of the borehole to 3 feet below ground surface(bgs)per San Joaquin County well standards. The top 3 feet of the boring 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, the soil cuttings will be sampled and profiled, and the material will be transported off-site for disposal at an appropriate disposal facility. Re-Installation of PMW-01 PMW-01 will be re-installed next to the original boring location by a C-57 licensed drilling contractor. All downhole equipment will be decontaminated prior to use. The well will be drilled to 23.5 ft bgs with an 8-inch hollow stem auger (HAS) rig. The well will be constructed with a 10 ft screen from 13-23 ft bgs. Once the total depth of 23 ft bgs is reached,the monitoring well will be constructed through the drilling casing. The monitoring well casing will consist of 2-inch nominal diameter, Schedule 40 polyvinyl chloride(PVC)pipe,with 0.020-inch factory-cut, slotted well screen, flush-threaded joints and a bottom cap. The outside boring diameter of PMW-01 will be eight inches, or at least four inches greater than the outside diameter of the well casings. The annular space between the borehole wall and well screen will be filled with Lapis-Lustre#3 filter pack sand to a depth of 11 ft bgs,which is about 2 feet above the top of engineers I scientists I innovators