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San Joaquin Delta Community College District Draft Environmental Impact Report for Master Plan Implementation September 2006 Schools located within a quarter mile of the proposed project could potentially be exposed to hazardous emissions resulting from airborne releases of hazardous materials adheringto fugitive dust (i.e., asbestos or metals), lead-based paint chips, petroleum hydrocarbonor VOCs in soils or groundwater. This is a potentially significant impact. Mitigation HZ-3(a): All hazardous materials shall be removed by a certified hazardous materials consultant prior to demolition activities. In addition, all appropriate emission reduction practices, technologies and practices shall be implemented, including: • Haul trucks carrying hazardous materials shall utilize routes that avoid schools. • Trucks carrying hazardous materials shall employ a techniques to prevent accidental discharge or elea se of haze d°Q sainment materials. Residual Impacts: Incorporation of mitigation HZ-3(a) would reduce project impacts to less than significant. Impact HZ-4: Soil excavation activities could result in potentially significant impacts to public health due to accidental excavation of contaminated soill and groundwater from onsite and/or offsite sources, it is currently unknown whether USTs associated with Delta College or State Hospital Farm annex site were all removed or whether they may still be present at the site. Leakage of petroleum products from USTs may have impacted soil or groundwater. VOCs found in gasoline, including BTEX and MTBE, are relatively mobile in the soil and may have migrated from offsite contamination. If residual levels of petroleum hydrocarbons from any previous leaks are stili present in subsurface soil, these compounds (through direct contact or inhalationT Of VOCs) could pose a threat to workers, students, faculty, visitors to the college, and children at the day care and child development centers. The residual petroleum hydro arbonsold also pose a threat to groundwater beneath the site. could In addition, there are I I LUSTS located within 0.75 miles of the campus. Ten of t reported at an elevation equal to or higher than the cam thereby hese tanks are us, groundwater and soil resources on campus, p Y presenting a risk to Mitigation HZ-4(a): In Order to minimize potential exposure of campus Populations hazardous materials and reduce chances of unanticipated remain derailing construction activities, Delta College should prepare a campus wide Phase 1 ESA to cover the area of campus not covered in the Loop Phase 1 and a more detailed Phase 11 study if warranted. Mitigation HZ-4(b): If recommended by the Phase l ESA, Delta College shall re pare a Phase 11 ESA as required to assess whether any USTs remain at the site and the extent of any impacts that may have been introduced to soil and✓or groundwater as a Page 3-illi