6.0 Landover Alternative Chapter 6 describes existing conditions of the Figure 6- 1: Landover Conceptual Site Plan affected environment and identifies the environmental consequences associated with the consolidation of the FBI HQ at the Landover site. A detailed description of ¨¦§495 the methodologies employed to evaluate impacts for BRIGHTSEAT ROAD ¨¦§95 each resource and the relevant regulatory framework is given in chapter 3, Methodology. The Landover site consists of approximately 80 acres of vacant land located near the intersection of Brightseat Road and Landover Road in Prince George’s County, Maryland. It is bound on the north by Evarts Street, on the east by the Capital Beltway, on the south by Landover Road, and on the west by TRUCK & EVARTS STREET SECONDARY Brightseat Road. Previously, the site was home to the TRUCK VEHICULAR SCREENING GATE Landover Mall, which operated between 1972 and REMOTE DELIVERY 2002. As of December 2014, all facilities associated FACILITY with Landover Mall have been demolished, and only STANDBY SUBSTATION GENERATORS the surface parking lot and retaining walls remain MAIN LANDOVER ROAD VEHICULAR GATE CENTRAL UTILITY WOODMORE TOWNE CENTRE on-site. Commercial uses in proximity to the site (EXIT ONLY) PLANT MAPLE RIDGE include Woodmore Towne Centre, located across the EMPLOYEE Capital Beltway (Interstate [I]-95) to the east, and the APARTMENTS PARKING Arena Plaza Shopping Center. South of Landover VISITOR CENTER Road. West of the site along Brightseat Road is the VISITOR PARKING 202 Maple Ridge apartment complex, while H.P. Johnson Park, additional apartment and single-family residential communities are located north of the site. FedExField EMPLOYEE MAIN HQ BUILDING PARKING football stadium is located approximately three- VEHICULAR GATE DEVELOPABLE (ENTRANCE ONLY) quarters of a mile to the southwest of the site. AREA PERIMETER The analysis of environmental impacts for the Landover FENCE Alternative is based on the conceptual site plan shown in Figure 6-1. This site plan is informed by both site planning principles and design requirements based on SOUTH FBI program needs. These site plans are conceptual VEHICULAR GATE in nature and represent a program-compliant layout (EXIT ONLY) that would yield the most conservative estimate of the environmental impacts associated with each alternative. Ultimately, the layout and design of the proposed FBI HQ could potentially be altered during the final design ARENA PLAZA process with the selected exchange partner. GSA would SHOPPING CENTER perform supplemental NEPA analysis, as necessary, if there is substantial variance from what is considered in this EIS. U.S. General Services Administration 353 FBI Headquarters Consolidation Draft Environmental Impact Statement 6.1 Affected Environment The following sections describe the Affected 6.1.1.1 Geology and Topography LANDOVER EARTH RESOURCES AFFECTED ENVIRONMENT OVERVIEW Environment for the Landover site and associated • The topography of the site slopes downward to the north with an elevation of approximately study areas at each resource topic evaluated in this The topography of the site slopes downward slightly to 180 feet AMSL along the southern-most boundary by Landover Road to approximately 100 feet Environmental Impact Statement (EIS). the north with an elevation of approximately 180 feet AMSL along Evarts Street to the north. above mean sea level (AMSL) along the southern- most boundary by Landover Road to approximately • The Landover site is classified as typical of the Upper CretaceousAge Brightseat-Severn 6.1.1 Earth Resources 100 feet AMSL along Evarts Street to the north, as Formation as detailed in the Geologic Map of Prince George’s County, Maryland. shown in figure 6-2. Localized moderate to steep The following sections describe the affected environment slopes, associated with regrading that occurred to • USDA-NRCS has identified six major soil associations within the Landover site, including Urban for earth resources for the Landover site. Earth resources accommodate the construction and operation of Land-Russet-Christiana Complex, Urban Land-Adelphia Complex, Urban Land-Collington encompass geology, topography, and soils. West, Adelphia-Holmdel-Urban Land Complex, Christiana-Downer-Urban Land Complex, and the Landover Mall, are located along the remaining Collington-Wist-Urban Land Complex. foundation of the demolished mall buildings. Demolition debris exists in piles throughout the site and further contribute to variations in topography on this site. FACIES A body of rock with specified characteristics. AMSL Above mean sea level (AMSL) is the average level for the surface of one or more of Earth’s oceans from which heights such as elevations may be measured. Example of manmade grades remaining from construction and demolition of Landover Mall PHYSIOGRAPHIC PROVINCE A geographic region with a characteristic geomorphology and often specific subsurface rock type or structural elements. U.S. General Services Administration 354 FBI Headquarters Consolidation Draft Environmental Impact Statement The geology of the Landover site is typical of the Figure 6- 2: Landover Topography Figure 6- 3: Physiographic Provinces of the National Figure 6- 4: Landover Geology Overview Upper Cretaceous Age Brightseat-Severn Formation Capital Region as detailed in the Geologic Map of Prince George’s County, Maryland. Minerals within this formation t consist of gray to medium gray, poorly sorted s S Evart ¦¨§95 fine-grained sand that directly underlies on-site 95 ¦¨§270 M A R Y soils. The base of the Brightseat-Severn Formation L A V I N may contain localized clusters of small pebbles, 495 R G I N D I A phosphorous clasts, and fossilized shark teeth. The Brightseat Rd Brightseat-Severn Formation is estimated to be approximately 50 feet thick in the vicinity of the site WASHINGTON ¤£50 495 ¦¨§ D.C. and directly overlies the sand and gravel facies of Capital Beltway ^ Landover ¤£50 the Potomac Group (Glaser 2003). The Potomac Site ¦¨§66 Group is Lower Cretaceous in age and consists ¦¨§495 §395 §295 of the undifferentiated Patapsco, Arundel, and L ¦¨ ¦¨ ¦¨§95 an do ¤£301 Patuxent Formations. In the vicinity of the site, the ver Potomac Group is composed of white to yellow-brown Rd 202 £1 interbedded quartz sand and silty clay lenses. The ¤ Potomac Group is estimated to be more than 200 Tkbs Brightseat Severn Formation ¦¨§95 feet thick for areas underlying the site (Glaser 2003). Qt Terrace Deposits General geological attributes, including attributes of 2 ft contours Kps Sand-gravel facies the Atlantic Coastal Plain physiographic province are 0 500 1,000 212 ft AMSL Kpc Silt-clay facies described in sections 5.1.1. Figure 6-3 illustrates the Feet Coastal Plain 0 7.5 15 location of the Landover site within the Coastal Plain 1 in = 1,000 feet Piedmont Province I Miles Adapted from Geologic Map of Prince George’s County Physiographic Province, and figure 6-4 illustrates the Sources: 1 in = 13.5 miles 82 ft AMSL ESRI (2013), GSA (2013), DC GIS (2013), USGS (2008) geology of the Landover site and its environs. Sources: ESRI (2013), GSA (2013), DC GIS (2013) U.S. General Services Administration 355 FBI Headquarters Consolidation Draft Environmental Impact Statement Table 6-1: Landover Site Soil Characteristics 6.1.1.2 Soils The potential of erosion for soil types is Water demonstrated using the , Acres Wind Drainage The United States Department of Agriculture (USDA) erosion K factor Slopes Erosion Building which indicates the susceptibility of a soil to Soil Type within Erosion and flooding Hydric Natural Resource Conservation Service (NRCS) (percent) Factor potential erosion by water. K values range from 0.02 Site Factor potential have identified six major soil associations within the (K factor) to 0.69. All other factors being equal, the Landover site, as shown in table 6-1 and figure 6-5. higher the value, the more susceptible the Moderately The vast majority of the site has been previously soil is to erosion by water. Urban well-drained developed and 90 percent of the site is currently land-Russet- 29 0 - 5 N/A N/A N/A and nearly No impervious surfaces. Each of the site soil associations Christiana complex zero flooding include an urban land component, meaning the soils potential have been or are currently altered by development. Moderately None of the soils identified at the site are considered Urban well-drained highly erodible soils nor are any of the soils considered land-Adelphia 17 0 – 5 N/A N/A N/A and nearly Yes to be prime farmland (USDA 2015a). The potential complex zero flooding of erosion for soil types is demonstrated using the potential erosion K factor, which indicates the susceptibility of Well-drained a soil to erosion by water. K values range from 0.02 Urban and nearly to 0.69. All other factors being equal, the higher the land-Collington- 27 0 – 5 N/A N/A N/A No zero flooding value, the more susceptible the soil is to erosion by Wist complex potential water. Susceptibility of soils to wind erosion is detailed using a wind erodibility group rating system, in which Moderately soils are assigned to a number ranging from 1 to 8, Adelphia-Holmdel- well-drained with soils assigned to group 1 having the greatest Urban land 6 0 – 5 0.37 3 Very limited and nearly No susceptibility to wind erosion and those in group 8 complex zero flooding being the least susceptible. From west to east, soil potential associations are as follows: Moderately Christiana- well-drained Urban Land-Russet-Christiana Complex Downer-Urban 1 5 – 15 0.49 6 Very limited and nearly No land complex zero flooding The Urban Land-Russet-Christiana Complex is located potential along the western site boundary and central portion Well-drained of the site and comprises 36 percent of the site. This Collington-Wist- and nearly soil complex consists primarily of fine sandy loam Urban land 4 5 – 15 0.20 3 Very limited No zero flooding and sandy clay loam and is typically located along complex potential interstream divides and swales, with slopes ranging from 0 to 5 percent.