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` a vi Cleanup Program — Sacramento Office � /� � �/ HALEY & ALDRICH, INC. �/ California Department of Toxic Substances Control r�/�L.G ■ '�� ro 4 August 2020 LA\�VRl walnut Creek, CA 94596 Page t 925949,1012 The purpose of the geotechnical and limited environmental investigation proposed herein is to support the geotechnical design of the proposed development and to conduct limited due diligence 4 August 202o environmental sampling to confirm historical results and assess soil that will be disturbed during the File No. 134707-003 proposed Site development activities. This Work Plan was developed with input from the Port of Stockton and their environmental consultant, ^. Cleanup Program —Sacramento Office Geosyntec Consultants (Geosyntec). A meeting will be scheduled with the DTSC upon submittal of this / California Department of Toxic Substances Control Work Plan to discuss any comments the DTSC may have regarding this Work Plan along with the 8800 Cal Center Drive proposed development and proposed mitigation measures and remedial actions to be implemented Sacramento, California 95826-3000 during Site development. Attention: Mr. Lance K. McMahan BACKGROUND Subjea: Due Diligence Geotechnial and Limited Environmental Investigation Work Plan Site 47 is an approximately 42-acre parcel located on Rough and Ready Island within the Port of Site 47 Stockton in Stockton, California. The property largely consists of vacant, unpaved land overgrown with Rough and Ready Island vegetation with several concrete pads and small structures in the vicinity of a former skeet/trap Port of Stockton shooting range in the northeast portion of the property and unoccupied buildings and adjacent Stockton, California abandoned tennis and basketball courts located on the eastem edge of the property. An overgrown model airplane landing strip and one unoccupied building exist in the central portion of Site 47. Railroad Dear Mr. McMahan: tracks run along the northern boundary of the property and cross into the Site 47 in the northwestern On be o TC N0. CAL. DEVELOPMENT, a Delaware corporation (TCC) Haley & Aldrich, Inc. (Haley Corner and enter a warehouse area to the west. & Aldrich) ha re t Is ue Diligence EC.,eotechnical and limited Environmental Investigation Work The United States Nary owned and operated Site 47 as an unpaved construction yard and equipment Plan (Work Plan) for Site 47 located on Rough and Ready Island within the Port of Stockton in Stockton, storage area beginning in the 1940s. The housing unit structures, model airplane landing strip, and California. This Work Plan details the planned due diligence activities including drilling and soil sampling skeet/trap shooting rage were constructed by 1973, The Port of Stockton took ownership of the to be conducted as part of the planning stage for the proposed development of the western portion of property in 2003 and have not performed any development activities except for the construction of Site 47 (Site, Figure 1), McCloy Avenue to connect with the Port of Stockton Expressway in the western portion of Site 47 (Geosyntec, 2020). Introduction and Background Np Site 47 is located on the eastern edge of the Sacramento—San Joaquin River Delta (delta) along the San INTRODUCTION / tl Joaquin River. The delta drains the Central Valley and a portion of the Sierra Nevada Range, which are /L rs.x �rtgm � s the sources of the clay, silt, sand, and gravel deltaic deposits in the region. These unconsolidated TCC is in the proc ` '�I• - o ewe ern po Ion of Site 47 from the Pont of Stockton and interbedded sediments extend to a depth of approximately 1,500 feet below ground surface (bgs) plans to develop the property for commercial use. Site 47 is currently under regulatory oversight by the regionally. Locally, the subsurface consists of a thin (approximately 1 foot thick) layer of gravel at the Department of Toxic Substances Control (DTSC) as the lead regulatory agency and the Central Valley surface, inorganic and organic silts, clay, silty clay, and silty sand from approximately 2 feet bgs to 10 Regional Water Quality Control Board (CV RWQCB) as the support agency, and development plans will be feet bgs. A thin (approximately 2.5 feet thick) water-bearing zone of silty sand has been observed at discussed with the DTSC and CVRW QCB prior to conducting any development activities. The Site approximately 9 feet bgs in the western portion of the property and appears to pinch out towards the included in the lease contains only the western portion of Site 47 as described in the Site legal east. An inorganic silt layer has been encountered between approximately 11 and 15 feet bgs in the description and bounds (Appendix A). western portion of the property and 7 to 12 feet bgs in the eastern portion of the property. A water- bearing zone of silty sand with a wedge of overlying clay and inorganic silt have been observed between The proposed development of the Site includes the construction of a 655,2D0 square foot (sf) Concrete approximately 14 feet 22 feet bgs. An approximately 3-foot-thick clay layer underlies the water bearing tilt-up warehouse building, 310,370 sf outdoor storage area, and approximately 1,160,000 sf of parking zone and a water-bearing zone of silty sand and poorly graded sand has been encountered beneath the and driveway areas with bio-detention basins (Figure 2). The development will also include asphalt and Portland cement concrete parking and driveway areas, loading docks, new underground utilities, new railroad spun, exterior concrete slabs and sidewalks, and landscape and bioretention areas.www.hmeya1cr;m.00m '%�(RI(/� 'H