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GOVERNMENT RECORDS SEARCHED / DATA C EN : TRACKING Area Radon Information: The National Radon Database has been developed by the U.S. Environmental Protection Agency (USEPA)and is a compilation of the EPA/State Residential Radon Survey and the National Residential Radon Survey. The study covers the years 1986-1992. Where necessary data has been supplemented by information collected at private sources such as universities and research institutions. EPA Radon Zones: Sections 307&309 of IRAA directed EPA to list and identify areas of U.S.with the potential for elevated indoor radon levels. Oil/Gas Pipelines/Electrical Transmission Lines: This data was obtained by EDR from the USGS in 1994. It is referred to by USGS as GeoData Digital Line Graphs from 1:100,000-Scale Maps. It was extracted from the transportation category including some oil,but primarily gas pipelines and electrical transmission lines. Sensitive Receptors: There are individuals deemed sensitive receptors due to their fragile immune systems and special sensitivity to environmental discharges. These sensitive receptors typically include the elderly,the sick,and children. While the location of all sensitive receptors cannot be determined, EDR indicates those buildings and facilities-schools,daycares,hospitals,medical centers, and nursing homes-where individuals who are sensitive receptors are likely to be located. USGS Water Wells: In November 1971 the United States Geological Survey(USGS)implemented a national water resource information tracking system. This database contains descriptive information on sites where the USGS collects or has collected data on surface water and/or groundwater. The groundwater data includes information on more than 900,000 wells,springs,and other sources of groundwater. Flood Zone Data: This data,available in select counties across the country,was obtained by EDR in 1996 from the Federal Emergency Management Agency(FEMA). Data depicts 100-year and 500-year flood zones as defined by FEMA. NWI: National Wetlands Inventory. This data,available in select counties across the country,was obtained by EDR in March 1997 from the U.S.Fish and Wildlife Service. Epicenters: World earthquake epicenters, Richter 5 or greater Source: Department of Commerce, National Oceanic and Atmospheric Administration Water Dams: National Inventory of Dams Source: Federal Emergency Management Agency Telephone: 202-646-2801 National computer database of more than 74,000 dams maintained by the Federal Emergency Management Agency. California Earthquake Fault Lines: The fault lines displayed on EDR's Topographic map are digitized quaternary fault lines, prepared in 1975 by the United State Geological Survey. Additional information(also from 1975)regarding activity at specific fault lines comes from California's Preliminary Fault Activity Map prepared by the California Division of Mines and Geology. California Drinking Water Quality Database Source: Department of Health Services Telephone: 916.324-2319 The database includes all drinking water compliance and special studies monitoring for the state of California since 1984.It consists of over 3,200,000 individual analyses along with well and water system information. California Oil and Gas Well Locations for District 2 and 6 Source: Department of Conservation Telephone: 916.323-1779 a TC0349496.1 r Page A24