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J ,I C4 f eJ ves.r __&AYCA_ Son Joaquin Areo FLOOD CONTROL rigenc4 March 02, 2021 Mariners Cove 2191 Market Street A San Francisco, CA 94114 RE: Parcel #071-260-030-OOD Dear Mariners Cove Property Owner: The US Army Corps of Engineers (USACE), in partnership with the San Joaquin Area Flood Control Agency (SJAFCA) and the Central Valley Flood Protection Board (CVFPB), is implementing the Lower San Joaquin River Project. The project, estimated at a total cost of $1.3 billion, includes 23 miles of levee repairs along the San Joaquin and Calaveras Rivers, among other actions. Once completed, the project will Increase flood protection for approximately 122,000 residents and reduce potential damage to an estimated $28 billion in property in north and central Stockton. The project Is being Implemented in several Increments. The first Increment — repairs to theTenmile Slough adjacent to Brookside — Is currently In design. Constructlon is expected to begin In spring 2022, The next proposed increment includes construction of a new levee along Fourteen Mile Slough and levee repairs between Mosher Slough and Five Mile Slough. Some geotechnical work (exploratory borings) is required to further analyze these proposed repairs. On behalf of the project partners, the USACE would like to perform exploratory borings on a small portion of your property (please see enclosed map). Representative soil samples will be obtained from the borings at approximately five-foot depth intervals. All samples will be taken off site for further examination and geotechnical laboratory testing for analysis. No environmental testing of the sol samples will be performed. If authorized by you, the boring work would typically be performed during normal business hours, Specific dates will be coordinated with you prior to work starting. There will be up to five people on-site to complete the borings: a driller, up to two driller's helpers, a logger, and a County grout inspector. The boring will be performed using a tire -mounted drill rig. In addition, there will be a support truck for the drill rig, a pick-up truck for the logger, and a pick-up truck/car for the grout Inspector, After each boring is completed, the driller will place soil cuttings and drilling fluid in 55 -gallon drums. The drums will be removed from the site on the day the boring Is complete and disposed of at an appropriate disposal facility. The borings will be backfilled with neat cement grout In accordance with the County's well permit requirements. Boring performed in parking lots will be capped wlth asphalt to match the existing parking lot surface. All equipment, materials, and trash will be removed from the site and the area will be restored to its prior condition. 22 E. Weber Avenue, Room 301, Stockton, CA 95202-2317 (209) 937-7900