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Cleanup in Vulnerable Communities'Initiative Final Project Reference:Bobson Cleaners Discovery and Enforcement Discovery Project Number:60688620-5.1 Investigation Work Plan Site Longitude: 38'48'26.92" North Site Latitude: 121° 12'57.36"West 2.1.6 Maps and Photographs Maps and photographs are provided as attachments to this Work Plan as the following figures: • Figure 1 Site Location Map • Figure 2 Site Plan Map • Figure 3 Land Use Map • Figure 4A Proposed Sampling Locations • Figure 4B Proposed Indoor Sampling Locations • Figure 5 Preliminary Conceptual Site Model • Figure 6A Sampling Location Results Map Template • Figure 6B Indoor Sampling Location Results Map Template 2.2 Regulatory Status The Site is currently listed as a RCRA-SQG, FINDS, ECHO, CHMIRS, Dry Cleaners, CERS, HAZNET, HWTS,and Environmental Data Resources, Inc, (EDR) Hist Cleaner.The Site was declared inactive in the HWTS database on September 22, 2005. • Resource Conservation and Recovery Act-Small Quantity Generator(RCRA-SQG) • Facility Index System/Facility Registry System(FINDS) • Enforcement and Compliance History Online(ECHO) • California Hazardous Materials Incident Reporting System (CHMIRS) • Dry Cleaner • California Environmental Reporting System (CERS) • Facility and Manifest Data (HAZNET) • Hazardous Waste Tracking System(HWTS) • EDR Exclusive Historical Dry Cleaners(EDR Hist Cleaner) 2.3 Site Physical and Environmental Characteristics The information presented in the following subsections is from the Phase I ESA Bobson Cleaners Inc., EDR report, and independent confirmation and research conducted by AECOM Environmental staff and Wanda Farmer. 2.3.1 Topography The Site appears to be generally flat with a slight downward slope toward the west, with a ground surface elevation at approximately 37 feet above mean sea level (USGS 2018, California 7.5 minute topographic quadrangle) (AECOM 2023). 2.3.2 Geology and Soil Types According to the EDR report,the Site is underlain with San Joaquin fine-grained sandy loam. San Joaquin soils have very slow infiltration rates and are moderately well-drained.These soils are described as coarse-grained soils down to a depth of approximately 60 inches(5 feet) (AECOM 2023). Prepared for: Department of Toxic Substances Control AECOM 6