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Phase II Environmental Site Assessment Manteca Multimodal Station Project Southeast of Moffat Boulevard and Main Street,Manteca, California EXECUTIVE SUMMARY This report presents the results of a Phase II Environmental Site Assessment(ESA)conducted for the property known as the Manteca Multimodal Station Project in Manteca, California, located to the southeast of the intersection of Moffat Boulevard and S. Main Street(Figure 1, Vicinity Map). The subject site is partially developed with an asphalt-paved bicycle path crossing the site. The remainder of the site is vacant but was historically developed with several warehouses, storage buildings, railroad spurs and a railroad station depot. Rincon conducted a Phase I ESA for the subject property in February 2010 (report dated June 30, 2010). Based on the preliminary findings of the Phase I ESA conducted for the site, the following suspect environmental conditions were identified: • The former presence of onsite railroad spurs. • The former presence of the Standard Oil Company supply station on the adjacent southwestern property. • The industrial uses of properties located south(up-gradient)of the subject property. • The presence of stained, cracked pavement and a 55-gallon drum on the subject property. The Phase I ESA recommended a soil and groundwater assessment be conducted at the site to determine if the property has been impacted by the past site uses and adjacent site uses identified during the Phase I ESA. The purpose of the Phase II ESA was to determine if the former presence of onsite railroad spurs, former presence of the Standard Oil Company supply station to the south of the subject property, industrial land uses adjacent to the south of the subject property, and the onsite 55-gallon drum and stained pavement have impacted soil or groundwater beneath the site. On December 6, 2010, five soil borings (B1 through B5)were completed along the southern boundary of the subject property (adjacent to the former Standard Oil Company supply station and existing industrial properties south of the site). The borings were advanced to 25 feet below grade and soil samples were collected from 5, 10, 15, 20 and 25 feet below grade. The soil samples obtained from 5 feet below grade were analyzed for total petroleum hydrocarbons (TPH) and volatile organic compounds(VOCs). In addition,grab groundwater sample were collected from each of the five borings and were analyzed for TPH and VOCs. On December 7, 2010, 16 soil borings (RB 1 through RB 16) were completed in the locations where railroad spurs were previously located on the subject property. The borings were advanced to 2 feet below grade and soil samples were collected from 0.5 and 2 feet below grade. Select soil samples obtained from 0.5 feet below grade were analyzed for TPH,total metals, VOCs and herbicides. On December 7, 2010, one soil boring(RB 17)was completed in the location where stained pavement(asphalt)was observed to the southeast of the former onsite building. The soil boring was advanced to 5 feet below grade beneath the stained pavement. Soil samples were collected at 1 and 5 feet below grade. The one-foot deep soil sample was analyzed for TPH, VOCs, semi volatile organic compounds(SVOCs),total metals,polychlorinated biphenyls(PCBs),pesticides and herbicides. Rincon Consultants 1