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5.ENVIRONMENTAL CHECKLIST MOUNTAIN HOUSE NEIGHBORHOODS K AND L INITIAL STUDY 7.HAZARDS 5) Open water bodies within the project site could provide active breeding e sites for mosquitoes, potentially causing an environmental nuisance condition and disease transmission. 6) 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. e 7) 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. 8) 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. Findings Related to Significant Impacts Identified in 1994 MEIR Impact No. I In response to potential hazards associated with residual pesticides and/or herbicides,the Master Plan was changed to require that an ESA report prepared in accordance with ASTM standards be submitted with the submittal of each Tentative Subdivision Map to assess the presence of any state or federal listed toxic materials(i.e.,fuel, pesticide, herbicide, or chemical residue)in the soil. If any residues are found in excess of the allowable amounts, a program of corrective action must be implemented prior to recordation of a Final Subdivision Map. Corrective actions must be conducted in accordance with the requirements of the County Environmental Health Department and all applicable state agencies. The project applicant has been in compliance with this requirement. It should be noted that the 1994 MEIR recommended that aerial spraying be restricted within 500 feet of the nearest dwelling along the western site boundary. This component of the 1994 MEIR Mitigation Measure 4.10-1 was found unnecessary due to the setbacks of residences from the western site boundary. Impact No. 2 The following measures were adopted into the Master Plan to address potential health impacts associated with public exposure to PCBs: 1) prior to each development permit submittal,the developer is required to request that PCB- containing electrical transformers be replaced with non-PCB-containing equipment and that any identified spill areas be evaluated for clean-up, and 2) e, the developer is required to prepare an annual information packet that includes a summary of major studies regarding electric and magnetic field effects and a list of reference studies. PCB-containing electrical transformers have not been discovered at the project site. Verification by PG&E that all transformers are not PCB-containing is a condition of approval. If PCB-containing material is found, (917111) 5-94