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Mountain House Specific Plan III ........................................................................................................................................................................... d. A Chevron owned 18-inch diameter crude oil pipeline located adjacent and parallel to the existing 26-inch diameter PG&E natural gas pipeline, The Master Plan includes provisions to protect against fuel releases that could negatively impact the quality of groundwater resources,soils,and public health and property,and to minimize the risk of human _ injury or property damage in the event of an explosion and/or fire at a natural gas pipeline. Specific Plans are required to include an updated map and assessment. The MHCSD has prepared the Emergency Pipelines Safety Plan, which provides mapping and assessment of pipelines within the community and complies with the requirements of the San Joaquin County Office of Emergency Services. 6.7.1.2 Specific Plan III Description Specific Plan III has two pipeline easement corridors within the planning area. All pipelines are — anticipated to remain in their existing alignments. A pipeline risk analysis was conducted for Specific Plan III addressing the two underground PG&E natural gas pipelines and the one underground Chevron _ crude oil pipeline,which are contained within the 50-foot total easement crossing the southwest comer of the site. The pipeline risk analysis study concluded that a setback of 68 feet from any pipeline within the easement to any habitable structures would reduce the risk level to less than one in a million. The open space corridor along the oil and gas pipeline easement provides for most of the required residential buffer area. No additional setback or no-build zone is needed to separate industrial and office structures from the pipeline easement boundaries to achieve the same risk level (See Figure 6-1). As discussed in Chapter Five,the California Department of Education has increased the hazards risk assessment setback between school sites and pipelines to 1,500 feet. The two K-8-schools in _ Neighborhood A/B are located at least 1,500 feet from the oil and gas pipelines.The joint use areas within the Neighborhood Park are also located outside the 1,500-foot setback. 6.7.1.3 Implementation Measures a. Prior to the approval of any Tentative Map located within 500 feet of any fuel pipeline,development plans shall be submitted for coordination with the owners of the pipelines. A site assessment shall be prepared by a qualified professional in compliance with the requirements of the County Environmental Health Department for areas located within 500 feet of any pipeline. If contamination is identified,an investigation and remediation shall be undertaken in accordance with the _ requirements of the County and the Regional Water Quality Control Board. 6-6 Draft 03/14/05 ...........................................................................................................................................................................