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obtained in Teller County. All three measurements exceeded the EPA action level of 4 picoCuries per liter <br />pCi/L). The maximum concentration detected was 215.0 pCi/L; the average concentration was 99.7 pCi/L. <br />The Site does not have a building. <br />3.3.2 Wetlands <br />The U.S. Fish and Wildlife Services (USFWS) National Wetlands Inventory has not mapped any wetlands on <br />the Site (GeoSearch, 2015a). <br />3.3.3 Floodplains <br />The Site is located within unshaded flood zone X; which is an area determined to be above the limits of the <br />500 -year flood (GeoSearch, 2015a). This is defined by FEMA as an area of minimal flood hazard. <br />3.4 Site History <br />The following resources were used in developing the Site history (Table 3-2): <br />Aerial photographs from selected years between 1941 and 2013 (GeoSearch, 2015c) <br />USGS topographic maps from selected years between 1894 and 2013 (GeoSearch, 2015d) <br />Tax assessor information, provided by the Teller County Assessor's Office <br />Interviews <br />Site visit <br />A complete list of references is included as Section 6.0. <br />Table 3-2 Summary of Site History <br />From To Site Use Source(s) <br />Aerial Photographs, Topographic <br />At least 1894 Present Undeveloped Maps, Interviews, Assessor Office, <br />Site visit <br />The ASTM standard requires identification of Site use to 1940 or first use, whichever is earlier. For the Site, <br />history was identified to 1894, at which time the Site was undeveloped, thereby establishing first use. <br />3.5 Questions Regarding Past Environmental Practices <br />Past environmental practices at the Site, as identified during the course of this Phase I ESA report, were also <br />reviewed (Table 3-3). <br />Phase I Environmental Site Assessment Page 9 <br />Squaw Gulch <br />Teller County Road 88, Cripple Creek, Colorado