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5.ENVIRONMENTAL CHECKLIST MOUNTAIN HOUSE NEIGHBORHOODS K AND L INITIAL STUDY 7.HAZARDS No chlorinated herbicides were detected in the 11 samples collected from Neighborhood L.A low concentration of 4,4'-DDE (2.1 micrograms per kilogram [ug/kg])was detected in one of the eight composite samples. Concentrations of 4.4'-DDE(at 4.2 ug/kg) and 4,4'-DDT(at 7.6 ug/kg)were detected in one of the discrete soil samples collected from the northern corner of the former barn in Neighborhood L. To put these analytical results in context,for comparison,the U.S. Environmental Protection Agency(USEPA) Region 9 Preliminary Remediation Goal (PRG)for clean-up of soil contaminated by these compounds is 1,700 ug/kg for residential use. the highest detected concentration of DDT at 7.6 ug/kg falls well below this threshold. Despite the low level of organochlorine pesticides detected, a human health risk screening evaluation was performed to provide an estimate of the potential chronic health hazard from contamination at Neighborhood L using the accepted methodology and assumptions of the USEPA, California Environmental Protection Agency(Cal EPA), and DTSC for quantifying risk and hazard. The cancer risk and non-cancer hazard quotients for all constituents of concern were summed to obtain the total cancer risk and total hazard index posed by these constituents. The total calculated cancer risk was determined to be 8.5 in one billion (8.55E-09);the total hazard was less than unity. The general screening value for cancer risk is one in one million(1 E-06);the screening value for non- cancer hazard is one (unity). Based on these results, the detected concentrations of DDE and DDT do not appear to present an elevated cancer risk or hazard quotient.The Limited Phase II ESA concluded that past practices of handling agricultural chemicals have not resulted in a significant release or threat to the site and there is not a potential hazard to public health or the environment from former agricultural use(Condor, 2004b). Electromagnetic Fields Electromagnetic fields(EMFs)are invisible energy fields composed of electric and magnetic fields that are generated by electrical devices. EMFs are emitted by everything that uses and/or conducts electricity, including power lines, electrical wiring, computers,television, hair dryers, and household appliances. While electrical fields are weakened by materials that conduct electricity (including trees, buildings,soil, and human skin), magnetic fields pass through most materials and are therefore difficult to shield. Both electric and magnetic fields decrease as the distance from the source increases(California Department of Health Services, 1999). Different forms of EMFs are produced by a variety of sources and may be differentiated based on their strength(frequency)and the ability of a particular EMF to cause ionization, a process that can produce molecular changes that can lead to damage in biological tissue and can potentially cause cancer. In the United States, electric energy facilities generate EMFs at a frequency of 60 hertz e �gnn�7 5-92