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SUPPLEMENTAL SITE INVESTIGATION WORK PLAN South Pointe Property Stockton, California Site Background 2.1 SITE DESCRIPTION AND OPERATIONS The site occupies 9.1 acres in a commercial/industrial area and is bordered on the north by the Stockton Channel, on the west by Mormon Slough, on the south by West Weber Avenue, and on the east by a parking lot associated with the municipal marina on the Stockton Channel. A pedestrian walkway (the Promenade) runs along the northern and western property boundaries, between the Property and the adjacent waterways. The location of the site is illustrated on Figure 1. The site has a long history of industrial use (approximately 1895 to the late 1980s). The site's location adjacent to the Stockton Channel provided convenient shipping access, and bulk materials were also moved in and out of the site via several rail spurs that were historically present at the site. Historical use has consisted primarily of agricultural materials storage warehouses containing commodities such as grain, fertilizer, feed, and produce (WKA, 2008). Historical Sanborn maps identified several of the structures as grain storage warehouses occupied by Stockton Milling Company, Farmer's Union and Milling Company Eureka Warehouses, California Navigation and Improvement Company, Southern Pacific Produce Company, and J.K. Armsby Grain and Produce Company. More recently, operators at the site included Ralston Purina Company, Delta Warehouse Company, and California Transportation Company. Grain, feed, fertilizer, and produce were identified as stored commodities in the warehouses and in on-site grain silos. The site continued to be an active agricultural processing facility until the late 1980s when the buildings were demolished and the land left vacant. All structures were removed from the site by 1993. Adjacent properties have a similarly long history of industrial use including storage and transfer of bulk petroleum hydrocarbon fuel products. Previous investigations have identified the presence of organochlorine pesticides (OCPs) in shallow soils along the central portion of the site, generally collocated with the historical rail spurs, whereby it appears that historical loading/unloading of agricultural products resulted in chemical releases to the ground and accumulation of OCPs in soil.The site, and the historical locations of the rail spurs, are illustrated on Figure 2. Elevated concentrations of total lead are frequently collocated with OCP-impacted soils. An area of petroleum hydrocarbon-affected soil, present in the northeastern portion of the site, is apparently related to historical pipelines that ran between the Stockton Channel and bulk petroleum storage facilities historically located south of the site. 2.1