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• Public and environmental health may be affected by potential historic pesticide and/or herbicide — residues in the environment,as well as by future pesticide and/or herbicide applications off-site. Potential health impacts may result from public exposure to PCBs associated with transformers or _ EMTs associated with overhead electrical lines. • Asbestos,if present in existing farm structures,could cause adverse health impacts to workers during renovation and/or demolition. • Materials disposed of at the small household landfill on the site may have affected soil and groundwater quality. — • Open water bodies in the project site could provide active breeding sites for mosquitoes,potentially causing an environmental nuisance condition and disease transmission. The development of the project may increase the potential for public exposure to explosives, fire,or the release of materials during railway accidents on the railway line crossing the northern portion of the project site. • Increased development along the natural gas pipelines traversing the site could increase the risk of _ pipeline rupture and fire or explosion which could result in death and injury or property damage. Improperly abandoned wells,wells without appropriate sanitary seals,and agricultural canals may act as conduits for agricultural chemical migration,potentially affecting surface and groundwater quality, or may represent a safety hazard. 4.9.3 SIGNIFICANCF_ THRESHOLDS The proposed project would result in significant public health and safety impacts if it would: Expose people to pre-existing hazardous materials(contaminated soil or groundwater,asbestos- containing materials); • Create a significant hazard to the public or the environment through reasonably foreseeable upset and accident conditions involving the likely release of hazardous materials into the environment; Emit hazardous emissions or result in the handling of hazardous or acutely hazardous materials, substances,or waste in one-quarter mile of an existing or proposed school; • Locate a school site on any of the following areas of potential hazardous conditions (based on CEQA Section 21151.8, CEQA Guidelines Section 15186 [c],and Education Code Section 17213[b]): • A current or former hazardous waste or solid waste disposal facility site; • A hazardous substance release site identified by the California Department of Health Services (DHS)or DTSC; — • The site of one or more buried pipelines that carry hazardous substances, acutely hazardous materials, or hazardous wastes; _. • Within one-quarter-mile of a source of hazardous emissions; EDAW College Park at Mountain House Specific Plan III Draft BIR Public Health and Safety 4.9-26 San Joaquin County