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For the area within 2 t 000 feet of the site seven water well com letion reports were on file at the California Department of Water Resources (DWR). None of these wells were found, during reconnaissance. The entire site vicinity appeared to be connected to California Water Service, ,p Y and none of its water supply wells existed within the site vicinity`. The:site vicinity is almost entirely commercial property, and city and county government buildings; No schools, hospitals, or other potential sensitive receptors were observed in the site vicinity. The nearest school to the site appeared to be the Trinity Lutheran School at 444 American Street, approximately 2,100 feet _ northeast of the site. The nearest surface water body to the site was McLeod Lake at Weber Point, approximately 1,000 feet west of the site. L No receptors appeared to be threatened by the gasoline compounds in soil and groundwater i beneath the site. On May 3, 2004, EHD requested that a site conceptual model be submitted so that the case could be evaluated for regulatory closure. On July 30, 2004, Ramage Environmental published Site Conceptual Model. 1.2.4 Additional Site Investigations and Human Health Risk Assessment On February 16, 2007, Ramage Environmental published Additional Site Investigation and � Groundwater Monitoring Report, which documented the soil and groundwater analytical results from three direct-push soil borings (B-4, B-5 and B-6) and dept -discrete groundwater analytical results from one on-site cone penetration test (CPT) boring (CPT-1). The soil boring and CPT locations are shown on Figure 3. L In the nine soil samples analyzed from the three soil borings, concentrations of gasoline compounds were not detected above laboratory reporting limitsl The 1,cumulative soil sample analytical results are summarized in Table 1. p r In the three soil borings to first groundwater, and in the depth-diIscrete groundwater sample collected from below the groundwater table, only MTBE was detected. MTBE was detected in B-4 is at 0.6 micrograms per liter (µg/l), in B-5 at 2.5 µg/l, in B-6 at 1.3i pg/l, and in CPT-1 at 3.1 µg/l. L The groundwater sample analytical results are summarized in Table 2. On April 25, 2008, Ramage Environmental published Report, Soil Vapor Sampling and Human L :� Health Risk Assessment, which documented the results of soil vapor sampling from four on-site locations (V-1, V-2, V-3 and V-5), and a human health risk assessment (HHRA). The soil vapor sample locations are shown on Figure 3. i i i L g i L r � II k