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Geosptec consultants 2. BACKGROUND 2.1 Site Description and Historical Site Use The Site is located on West Hammer Lane between Brentwood Drive and Alexandria Place in Stockton, California. The Site is approximately 4.86 acres of commercial property (strip mall) located at 1762 West Hammer Lane, Stockton, California (Figure 2). SGM, a general partner of Lincoln Properties Ltd., owns the Site. Dry-cleaning operations were historically performed at the Site in tenant spaces 1744 West Hammer Lane (currently a pizza restaurant)and 1762 West Hammer Lane(current location of Park Wood Cleaners,which has operated as a drop-off facility since on Site dry-cleaning ceased in January 1995). Based on information gathered to date by SGM, it appears that dry-cleaning operations in the 1744 West Hammer Lane space began in approximately June 1959 and continued until March 1982, when the dry- cleaning business moved to the 1762 West Hammer Lane space. David's New York Style Pizza currently occupies the 1744 West Hammer Lane tenant space. As part of the move from the 1744 to the 1762 tenant space, previous dry-cleaning machines reportedly were removed and new cleaning equipment was installed. On-Site dry-cleaning occurred until 1995,when all dry-cleaning equipment was removed and the facility continued as a drop-off business,with dry-cleaning performed only at an off-Site facility. 2.2 Site Geology and Hydrogeology The Site is located within the Central Valley sub-section of the Great Valley geomorphic province(DWR, 2012). Geology near the Site generally consists of unconsolidated alluvial and floodplain deposits of the Modesto Formation. The Modesto Formation consists of a heterogeneous mix of poorly sorted clay, silt, sand, and gravel with occasional beds of claystone, siltstone, sandstone, and conglomerate. These units are discontinuous and have considerable lateral and vertical variability. Similar lithologies are described in drilling logs of domestic wells in the Site vicinity, as well as soil boring logs from environmental investigations in the general Site vicinity(GSI, 2017). Recent groundwater monitoring at the Site has reported depth to groundwater observed around 18 feet below ground surface(ft bgs)with groundwater flowing towards the east-northeast(E2C, 2025). 2.3 Summary of Previous Investigations In response to MRP No. R5-2017-0835, indoor air sampling was performed in November 2017 in accordance with the approved Indoor Air Sampling Workplan (E2C, 2017a). Results from this sampling event were reported on 7 December 2017 in a letter report (E2C, 2017d). Chlorinated solvents, including PCE,were not reported in indoor air samples. A Site Investigation Work Plan was submitted to the CVRWQCB on 15 November 2017,with an addendum submitted 30 November 2017 (GSI,2017,E2C,2017c) and additional sample collection was performed in January 2018. A total of 60 soil samples collected from depths ranging from 2 to 14.5 ft bgs, 18 soil vapor samples collected from depths of 5 and 11 ft bgs,and 4 groundwater samples were collected.Four shallow 3 September 2025