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GEOTECHNICAL ENVIRONMENTAL WATER RESOURCES EN CONSTRUCTION SERVICES Expect Excellence-- - COASTAL/MARINE GEOTECHNICS Project No. 5044.000.016 November 11, 2022 Mr. Jeff Wong San Joaquin County Environmental Health Department 1868 East Hazelton Avenue Stockton, CA 95205 Subject River Islands—Levee Relief Wells Lathrop, CA WORK PLAN FOR RELIEF WELL INSTALLATION Dear Mr. Wong: As requested by our client, Reclamation District 2062, ENGEO has prepared this work plan to construct 28 groundwater relief wells at the subject project in Lathrop, California within the River Islands development. PROJECT DESCRIPTION The Project is located at 4500 Stewart Road in Lathrop, California, approximately 1 mile southwest of the intersection of Paradise Road and Stewart Road, as shown in the Vicinity Map (Figure 1). The parcels are identified as Assessor's Parcel Numbers(APNs) 213-11-004 (approximately 401.37 acres in area) and 213-11-003 (approximately 151 acres in area). The APNs were identified using the San Joaquin County online GIS database. No address is listed for APN 213-11-004. We present this work plan to the San Joaquin County Environmental Health Department and request approval to perform the services described below. SCOPE OF WORK A total of 28 wells are proposed to be constructed, as shown in Site Plan (Figure 2). Relief Well Construction We will coordinate with a licensed drilling contractor to drill the relief wells. At least 2 business days prior to drilling,we will mark the site for an Underground Service Alert(USA)utilities check. Drilling for relief wells will be completed using the mud-rotary drilling method utilizing a 10-inch-diameter auger to accommodate a 2.5-inch-diameter tremie pipe in the 3-inch-wide annulus to a depth of approximately 55 feet. Potable water will be used to mix the drilling mud. Once the drilling is completed, the hole will be sounded to assure an open hole to the required depth. The wells will consist of a 4-inch-diameter 304L schedule 10S blank casing from just below the existing ground surface to an approximately Elevation -10 feet (NAVD88) followed by a 4-inch-diameter stainless-steel,wire wrapped screen beginning at an approximately Elevation-10 feet and terminating at an approximately Elevation -40 feet. The bottom of the casing will consist of a sand cellar and bottom cap terminating at an approximately Elevation-45 feet.All casing and screens will be new,and connections will utilize flush threaded connectors. Casing centralizers will be placed on blank casing directly below and above the well screen. 17278 Golden Valley Parkway, Lathrop CA 95330 • (209)835-0610 • Fax(888)279-2698 www.engeo.com