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! MOUNTAIN HOUSE NEIGHBORHOODs K AND L INITIAL STUDY 5.ENVIRONMENTAL CHECKLIST 7,HAZARDs (Hz). Electromagnetic radiation ranging from 1 Hz to 300 Hz is considered to be 4 extremely low frequency and nonionizing(OSHA, 2004). Over the last 20 years, public concerns over the potential effects of EMFs on E human health have resulted in several epidemiological, laboratory,and clinical studies.Some studies have suggested that there may be an association between F. 1 electromagnetic fields and childhood leukemia. However, studies have not concluded that there is such a connection. At present,studies do not provide strong evidence for an association between EMF exposure and adult cancer or other forms of cancer in children (EMF RAPID, 2002). In 1989 and 1993,the California Department of Education enacted requirements for setbacks from electrical transmission lines between new schools and the edge of the transmission easement(EHIB, 2004). These requirements were not based on specific health effects, but on the rationale that EMF radiation is reduced with increased distance from the source. There are no state or federal regulations that establish setbacks for other land uses. The setbacks required by the Department of Education for new schools are as follows: ■ 100 feet from 50-to 133-kilovolt(kV)lines; ■ 150 feet from 220-to 230-kV lines; and ■ 350 feet from 500-to 550-kV lines. Despite the lack of state and federal regulations regarding setbacks from other land uses, the Master Plan(Section 6.3, page 194)designates the following setbacks for residential land uses from the edge of the Rio Oso-Tesla power line easement located approximately 500 feet east of Neighborhood L: ■ 25 feet for residential dwelling units; ar ■ 10 feet for non-residential structures; and • No setback for parking and storage areas. F41 Significant Impacts Identified in 1994 MEIR The 1994 MSIR identified significant and potentially significant public health and safety impacts of the Master Plan as follows: 1) Public and environmental health may be affected by potential historic pesticide and/or herbicide residues in the environment, as well as by M future pesticide and/or herbicide applications off-site. 2) Potential health impacts may result from public exposure to PCBs associated with transformers or electromagnetic fields associated with overhead electrical lines. 3) Asbestos, if present in existing farm structures, could cause adverse health impacts to workers during renovation and/or demolition. 4) Materials disposed of at the small household landfill on the site may have F! affected soil and groundwater quality. pall 1) 5-93 [ 1