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Phase II Environmental Site Assessment Manteca Multimodal Station Project Southeast of Moffat Boulevard and Main Street,Manteca, California PROJECT HISTORY Rincon conducted a Phase I Environmental Assessment(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 suuuiwc�iiciii pruperiy. • 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 of 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. PURPOSE AND SCOPE OF WORK 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. Our scope of work included the following: • Health and Safety Program-Rincon Consultants prepared a site specific health and safety plan. The plan outlined the procedures that Rincon Consultants' personnel followed to minimize the potential for health and safety hazards during the course of work performed at the project site. • Utility Notification-Prior to the commencement of the subsurface drilling, Rincon pre- marked the drilling area in white and notified Underground Service Alert utility marking service. California law required this notification. The utility marking service identified known utility locations in the public right of way. In addition, Rincon asked the property owner if they knew of any subsurface utilities in the proposed drilling locations. • Permitting-Prior to the commencement of the subsurface drilling and sampling activities, Rincon completed a well and boring permit application and conveyed the fees required by the San Joaquin County Environmental Health Department(EHD). In addition,Rincon conveyed an inspection fee that was required by the EHD to mobilize to the project site during drilling activities. A copy of the permit is in Appendix 1. • Soil and Groundwater Sampling-Former Standard Oil Company Supply Station and Industrial Adjacent Land Uses South of the Site-Using a Geoprobe direct push rig, five soil borings (B 1 through 135) were advanced along the southern boundary of the subject property to a maximum depth of 25 feet below grade. Soil samples were obtained from depths of 5, 10, 15, 20, and 25 feet below grade. In addition, a grab groundwater sample was collected from each of the five borings. Groundwater was encountered between 18 and 22 feet below grade. Select soil samples and the groundwater samples were analyzed for TPH and VOCs. r Rincon Consultants 4