Mid-Atlantic Power Pathway Chalk Point Substation to Indian River ...

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Mid-Atlantic Power Pathway Environmental Review Document Chalk Point Substation to Indian River Substation Volume II – Environmental Analysis of April 13, 2011 Chalk Point Substation to MD/DE State Line Maryland Geological Survey (MGS). 1981. A Brief Description of the Geology of Maryland. Available at: http://www.mgs.md.gov/esic/brochures/mdgeology.html. Maryland Geological Survey (MGS). 2007a. Maryland’s Dinosaurs. Available at: http://www.mgs.md.gov/esic/features/mddino.html. Maryland Geological Survey (MGS). 2007b. Calvert Cliffs, Maryland. Available at: http://www.mgs.md.gov/esic/brochures/ccliffs.html. Maryland Geological Survey (MGS). 2007c. Earthquakes and Maryland. Available at: http://www.mgs.md.gov/esic/brochures/earthquake.html. National Atlas.gov. 2009. National Atlas of the United States. Available at: http://www.nationalatlas.gov/. Paleontology Portal. 2008a. The Quaternary in Maryland, US. Available at: http://www.paleoportal.org/index.php?globalnav=time_space&sectionnav=state&state_id=27&pe riod_id=7. Paleontology Portal. 2008b. The Tertiary in Maryland, US. Available at: http://www.paleoportal.org/index.php?globalnav=time_space&sectionnav=state&state_id=27&pe riod_id=8. Peterson, M.D., A.D. Frankel, S.C. Harmsen, C.S. Mueller, K.M. Haller, R.L, Wheeler, R.L. Wesson, Y. Zeng, O.S. Boyd, D.M. Perkins, N. Luco, E.H. Field, C.J. Wills, and K.S. Rukstales. 2008. Documentation for the 2008 Update of the United States National Seismic Hazard Maps. United States Geological Survey Open File Report 2008-1128. Available at: http://pubs.usgs.gov/of/2008/1128/. Radbruch-Hall, D.H, R.B. Colton, W.E. Davies, I. Lucchitta, B.A. Skipp, and D.J. Varnes. 1982. United States Geological Survey Professional Paper 1183: Landslide Overview Map Of The Conterminous United States. Available at: http://pubs.usgs.gov/pp/p1183/pp1183.html. Reger, J.P. and E.T. Cleaves. 2008. Draft Physiographic Map of Maryland and Explanatory Text for the Physiographic Map of Maryland. Maryland Geographic Society Open File Report 08-03-01. Available at: http://www.mgs.md.gov/esic/publications/internet.html. U.S. Army Corps of Engineers (USACE). 1995. Engineering and Design: Earthquake Design and Evaluation For Civil Works Projects. Available at: http://www.usace.army.mil/publications/engregs/er1110-2-1806/. U.S. Geological Survey (USGS). 2005. 2005 Minerals Yearbook: The Mineral Industry of Maryland. Available at: http://minerals.usgs.gov/minerals/pubs/state/2005/myb2-2005-md.pdf. U.S. Geological Survey (USGS). 2007. Maryland Earthquake Information. http://earthquake.usgs.gov/regional/states.php?region=Maryland. Wallace, L.A. No Date. Fossils of Calvert Cliffs. Available at: http://calvert-county.com/fossils.htm. 1-14
Mid-Atlantic Power Pathway Environmental Review Document Chalk Point Substation to Indian River Substation Volume II – Environmental Analysis of April 13, 2011 Chalk Point Substation to MD/DE State Line 1.2 SOILS AND SEDIMENTS This section provides information on the soil resources associated with the installation and operation of the Project in Prince George’s, Calvert, Dorchester and Wicomico Counties, Maryland. Soil resources reviewed include the existing conditions, soil types, and soil limitations occurring at the converter stations and along the transmission line route. Existing conditions are addressed first in Section 1.2.1 followed by an analysis of potential Project impacts to those resources in Section 1.2.2. 1.2.1 Existing Conditions Fifty-five types of soil (soil series) and water are located within the Project boundaries and right-of-way. The Project soils information presented in this Environmental Review Document (ERD) is based primarily on Soils Data Mart data obtained from the Natural Resources Conservation Service, of the United States Department of Agriculture (USDA-NRCS 2010). Table 1.2-1 provides a summary description for each soil series that occurs within the Project components from the Chalk Point Substation to the Maryland/Delaware state border. Note that soils are often mapped as combinations of multiple series (e.g., KgB – Klej-Galloway complex, 0 to 5 percent slopes). The composition of the specific soils within the extent of each of the six sub-Project components is provided following this initial summary. Actual soil conditions at any location may vary from the generalized soil types/complexes mapped. Table 1.2-1 Soil Series Within the Project Right-of-Way and Project Boundaries Soil Series Description Adelphia The Adelphia series consists of deep moderately well drained or somewhat poorly drained soils on uplands. They formed in acid Coastal Plain deposits containing glauconite. Typically, they have a fine sandy loam surface layer 14 inches thick. The subsoil from 14 to 30 inches is mottled olive brown sandy clay loam. It contains 10 to 40 percent glauconite. The substratum from 30 to 60 inches is olive gray and yellowish brown sandy loam and loamy sand. The parent material consists of glauconite bearing loamy fluviomarine deposits. Depth to a root restrictive layer is greater than 60 inches. The natural drainage class is moderately well drained. Water movement in the most restrictive layer is moderately high. Available water to a depth of 60 inches is high. Shrink-swell potential is low. This soil is not flooded. It is not ponded. A seasonal zone of water saturation is at 24 inches during February. Organic matter content in the surface horizon is about 5 percent. This soil does not meet hydric criteria. Askecksy The Askecksy series consists of poorly drained, level soils of the Mid-Atlantic Coastal Plain. In a representative profile, the surface layer is very dark grayish brown and grayish brown loamy sand to a depth of 8 inches. The underlying layers are light gray and gray loamy sand or sand to a depth of 72 inches. This soil is poorly drained. The slowest permeability within 60 inches is rapid. Available water capacity is moderate and shrink swell potential is low. This soil is not flooded and is not ponded. The top of the seasonal high water table is at 6 inches. There are no saline horizons. This component is a hydric soil. 1-15
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