ENVIRONMENTAL ASSESSMENT Hanson Property Aldie, Virginia Prepared For: Loudoun County Office of County Administrator ATTN: Mr. Paul L. Brown 1 Harrison Street, S.E. Leesburg, Virginia 20176 Prepared By: TRIAD ENGINEERING, INC. 210 North 21st Street, Suite D Purcellville, Virginia 20132 October 22, 2008 TRIAD Project No.: 05-08-0105 210 N 21st Street, Suite D Purcellville, Virginia 210322 Phone (540) 338-8150 TRIAD ENGINEERING, INC. Fax (540) 338-8147 September 2008 Mrs. Dawn Klassen Loudoun County Office of Capital Construction 211 Gibson Street, Suite 123 Leesburg, Virginia 20176 Subject: Phase I Environmental Site Assessment Hanson Property Evergreen Mills Road Aldie, Virginia TRIAD Project No. 05-08-0105 Dear Mrs. Klassen: Enclosed is the Phase I Environmental Site Assessment report for the above-referenced 257.35-acre Hanson property. Triad Engineering, Inc. appreciates the opportunity to assist you with this project. If you have any questions or comments concerning this site and our conclusions or need additional information, please feel free to contact the undersigned. Sincerely, TRIAD ENGINEERING, INC. _____________________ Glenn R. Pyle, CPG, L.R.S. Senior Environmental Geologist _____________________ Alex Miller Staff Environmental Scientist Triad Engineering, Inc. Morgantown • St. Albans Greensburg Winchester • Purcellville Hagerstown West Virginia Pennsylvania Virginia Maryland TABLE OF CONTENTS COVER SHEET TRANSMITTAL LETTER EXECUTIVE SUMMARY Section Page 1.0 PURPOSE AND NEED.....................................................................................................1 1.1 INTRODUCTION................................................................................................................1 1.2 DESCRIPTION..................................................................................................................1 1.3 PURPOSE AND NEED FOR THE PROPOSED ACTION...........................................................2 1.4 RELATED ENVIRONMENTAL DOCUMENTS.........................................................................2 1.5 PERMITS, LICENSES, AND ENTITLEMENTS........................................................................2 2.0 ALTERNATIVES INCLUDING PROPOSED ACTION......................................................2 2.1 PROPOSED CONSTRUCTION ............................................................................................2 2.2 OTHER LOCATIONS .........................................................................................................3 3.0 AFFECTED ENVIRONMENT ...........................................................................................3 3.1 PHYSICAL ENVIRONMENT ................................................................................................3 3.1.1 Aesthetic ..................................................................................................................3 3.1.2 Climate .....................................................................................................................3 3.1.3 Soils/Geology ..........................................................................................................3 3.1.4 Hydrology.................................................................................................................3 3.1.5 Air Quality ................................................................................................................4 3.1.6 Noise.........................................................................................................................4 3.1.7 Pollution and Contaminants...................................................................................4 3.1.8 Prime, Unique, and State Significant Farmlands .................................................4 3.1.9 Wild and Scenic Rivers...........................................................................................5 3.2 BIOLOGICAL ENVIRONMENT ............................................................................................5 3.2.1 Vegetation ................................................................................................................5 3.2.2 Threatened and Endangered Species ...................................................................6 3.2.3 Fish and Wildlife......................................................................................................7 3.2.4 Insects and Disease ................................................................................................8 3.2.5 Wetlands and Floodplain........................................................................................8 3.3 SOCIOECONOMIC ENVIRONMENT ...................................................................................10 3.3.1 Economic Base......................................................................................................10 3.3.2 Housing ..................................................................................................................10 3.3.3 Utilization ...............................................................................................................10 3.3.4 Infrastructure .........................................................................................................10 3.4 SOCIAL ENVIRONMENT..................................................................................................10 3.4.1 Recreation..............................................................................................................10 3.4.2 Cultural Resources ...............................................................................................11 3.5 EXISTING SITE CONSIDERATIONS ..................................................................................11 3.5.1 Site Structures.......................................................................................................11 3.5.2 Security ..................................................................................................................11 3.5.3 Site Preparation.....................................................................................................11 4.0 ENVIRONMENTAL CONSEQUENCES .........................................................................11 4.1 PHYSICAL RESOURCES .................................................................................................12 4.1.1 Contaminants ........................................................................................................12 4.1.2 Air Pollution ...........................................................................................................12 4.1.3 Water Quality .........................................................................................................12 4.1.4 Groundwater ..........................................................................................................12 4.1.5 Permitting...............................................................................................................12 4.1.6 Aesthetics ..............................................................................................................12 4.1.7 Noise.......................................................................................................................13 4.1.8 Social Impact and Environmental Justice ..........................................................13 4.2 BIOLOGIC RESOURCES .................................................................................................13 4.2.1 Vegetation ..............................................................................................................13 4.2.2 Threatened and Endangered Species .................................................................14 4.2.3 Fish and Wildlife....................................................................................................14 4.2.4 Insects and Disease ..............................................................................................14 4.2.5 Unique Natural Areas............................................................................................14 4.3 ECONOMIC FACTORS ....................................................................................................14 4.3.1 Economic Impact...................................................................................................14 4.3.2 Energy Use and Conservation .............................................................................14 4.4 SOCIOECONOMIC RESOURCES ......................................................................................15 4.4.1 Community Asset..................................................................................................15 4.4.2 Health and Safety ..................................................................................................15 4.4.3 Cultural Resources ...............................................................................................15 4.4.4 Solid Waste Management .....................................................................................15 4.5 UNAVOIDABLE ADVERSE EFFECTS ................................................................................15 4.6 SHORT-TERM USES AND LONG-TERM PRODUCTIVITY ....................................................16 4.7 IRREVERSIBLE AND IRRETRIEVABLE COMMITMENT OF RESOURCES ................................16 4.8 CUMULATIVE IMPACTS ..................................................................................................16 4.9 MITIGATION ..................................................................................................................16