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ri BAJADA <br />Geosciences, Inc. <br />28301 Inwood Rd. <br />Shingrwn, CA 96088 <br />(530) 638-5263 <br />March 14, 2018 <br />Project No.: 1801.0111 <br />Subject: Geotechnical Exploration Work Plan <br />Gillson Trucking Shop, Service & Office Facility <br />Stockton, California <br />Bajada Geosciences, Inc. (Bajada), has been retained to provide geotechnical engineering services for <br />the design of a new facility for Gillson Trucking. That facility is located at 1801 E. Dr. Martin Luther <br />King Boulevard (E. Charter Way) in the City of Stockton, as shown on attached Plate 1. The following <br />work plan describes the exploratory work scheduled on site. <br />DRILL HOLE LOCATIONS <br />Eight drill holes are proposed on the project site in the vicinity of the proposed new structure. The <br />approximate drill hole locations are shown on attached Plate 2. <br />EXPLORATION METHODS <br />The drill holes will be advanced using 8.25-inch diameter hollow-stem auger drilling methods. Prior <br />to drilling, concrete slabs will be cored to allow access to subgrade soils. The proposed drill holes will <br />be excavated to depths ranging from 15 to 50 feet below the ground surface. Soil samples will be <br />obtained at approximately 5-foot depth increments using standard penetration test (SPT) or California <br />modified split-spoon samplers. <br />DRILL HOLE DESTRUCTION METHODS <br />Upon completion of logging and sampling of each drill hole, the excavation will be backfilled and <br />destroyed using cement-grout, as shown on attached Plate 3. The grout will extend from the bottom <br />to top of hole and will be placed using a tremie system. No drill hole will remain open once logging <br />and sampling is completed. No drill hole will be completed as a monitoring well. Cuttings from the <br />drill holes will be left on site for later disposal. <br />Quality Geotechnical Engineering Services