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MOUNTAIN ROUSE PROPOSED ALTAMONT HEIGHTS TENTATIVE MAP 4. ENVIRONMENTAL CHECKLIST 4.7 HAZARDS y SIGNIFICANT IMPACTS IDENTIFIED IN 2005 SPIIIEIR The SPIIIEIR identified seven impacts related to potential hazards. Four, involving exposure to hazardous materials during 11 construction, release of hazardous emissions and materials within one-quarter mile of a school, exposure to electromagnetic fields, and exposure to non- potable water,were determined to be less than significant_ One, involving the locations of an j elementary school, does not pertain to the proposed project, which does not include a school. I€ The following two impacts were determined to be potentially significant and pertain to.the proposed project: Impact 4.9-1•: Public.Health and Safety:Possible Exposure to Pre-Existing Hazardous Materials-During Construction. The proposed project could unearth or otherwise disturb pre-existing hazardous materials at the project site during construction,potentially exposing construction workers or others to hazardous materials. A significant impact would occur. Impact 4.9-5: Public Health and Safety---Exposure to Pipeline Hazards. The proposed project would result in the development of sensitive land uses in close proximity to existing natural gas and crude oil pipelines, and would expose persons to contamination or explosion hazards associated with the pipelines. A significant f impact would occur. } MITIGATION MEASURES IDENTIFIED IN 2005 SPIIIEIR Mitigation Measure 4.9-1 in the SPIIIEIR addresses possible exposure to pre-existing hazardous materials during construction. It provides for monitoring and the testing of soils for contamination during construction. Recommendations made by the experts performing the monitoring and testing shall be implemented. Aboveground and underground storage tanks, septic systems, refuse piles, waste ponds, and electrical transformers containing PCBs shall be removed before construction. The San Joaquin County Environmental Health Department(SJCEHD) shall be satisfied that the contamination has been attenuated and 4 poses no significant hazard before construction commences or building permits are issued. Mitigation Measure 4.9-1 states that prior to the demolition or modification of structures E located in the SPIII area, qualified hazardous materials experts shall survey buildings constructed before 1981 for asbestos and lead-based paint. A licensed asbestos and lead- based paint abatement contractor shall perform demolition or modification of any structures containing asbestos or lead-based paint in accordance with applicable regulations. Implementation of the above mitigation measure would reduce impacts associated with possible exposure of people to pre-existing hazardous materials during construction to a less- than-significant level. Mitigation Measure 4.9-5 in the SPIIIEIR addresses exposure to hazards associated with the PG&E-Chevron pipeline easement located northeast of the Altamont Heights project site. It states that no residences shall be permitted within 68 feet of the edge of the easement. The northeast corner of the project site is approximately 300 feet away from the pipeline easement. t 4-36