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L MOUNTAIN HOUSE PROPOSED MACHADO TENTATIVE MAP 4. ENVIRONMENTAL CHECKLIST 4.7 HAzARDS SIGNIFICANT IMPACTS IDENTIFIED IN 2005 SPIIIEIR L The SPIIIEIR identified seven impacts related to potential hazards. Four, involving exposure to hazardous materials during construction,release of hazardous emissions and materials Lwithin one-quarter mile of a school, exposure to electromagnetic fields, and exposure to non- potable water, were determined to be less than significant. The following three impacts were determined to be potentially significant: L 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 r construction,potentially exposing construction workers or others to hazardous materials. A significant impact would occur. r. Impact 4.9-4: Public Health and Safety—Locate a School Site in an Area of Potential Hazards. One of the two proposed K-8 school sites would be located in an area of potential hazardous conditions as defined by CEQA(Section 21151).The ` school would be located less than one-quarter mile from a potential source of hazardous emissions and a location where large amounts of hazardous materials may potentially be used and stored. A significant impact would occur. L 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 impact would occur. L 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, dairy waste ponds, 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 poses no significant hazard before construction commences or building permits are issued. L Mitigation Measure 4.9-1 states that prior to the demolition or modification of structures 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. 4-35 f.