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1 ' amec 2.0 SITE DESCRIPTION The site is located in central downtown Stockton near the inland channels of the Port of Stockton (Figure 1). The City of Stockton is located at the eastern edge of the California Delta, a large estuary formed by the confluence of the Sacramento and San Joaquin Rivers before they empty into San Francisco Bay. The site is about 1.8 acres in size and occupies most of the city block bounded by East Poplar, East Flora, North Hunter, and North EI Dorado streets (Figure 2). The site consists of a single building on the northern half of the site and a paved parking lot occupying the remainder of the site. A meeting hall (Native Sons of California building) occupies the southeastern corner of the city block. This area of Stockton represents the older portion of the downtown area and has historically been an area of mixed residential and commercial use. The current site configuration was developed by UniFirst starting in 2002. Just prior to redevelopment, the site was occupied by residential units, a commercial laundry facility, a meeting hall, and other businesses. Previous tenants on the site may have included gas stations, auto repair, and auto sales businesses (EECI, 2004). The laundry facility occupied the southwest portion of site and operated for decades. CVOCs, used in the dry cleaning process, were stored and used at the laundry facility from about 1948 to 1983 (EECI, 2001). 3.0 REMEDIAL INVESTIGATIONS AND REMEDIATION Significant remedial investigation and remediation have been conducted by UniFirst at this site from 2002 to the present with oversight by the San Joaquin County Environmental Health Department (SJCEHD) and the RWQCB. The investigations have characterized the nature and extent of chemicals in soil, soil vapor, and groundwater at the site and remediation has removed chemical mass from these media and significantly reduced their potential threats to humans and the environment. The investigations and remediation completed to date at this site are described in detail in several documents submitted to the SJCEHD and RWQCB and are summarized in the CAP. These activities are briefly listed below. • Underground Storage Tank Investigation and Soil Removal. Piping and approximately 225 tons of soil containing petroleum hydrocarbons were removed and disposed of at an off-site facility in 2002. • Soil Excavation, Underground Storage Tank Removal, and Oil Release Remediation. Following the discovery of soil containing petroleum hydrocarbons during grading for the parking lot in November 2003, surface soil samples and samples to 20 feet below ground surface (bgs)were collected by UniFirst from the area of impacted soil and submitted to a laboratory for analysis. A total of 262 tons of soil containing petroleum hydrocarbons and CVOCs were excavated and AMEC Geomatrix, Inc. hl3000s113290Wrchive113290-49.DOC 2