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  • ______________________________________________________________________________

    LIMITED PHASE II ENVIRONMENTAL SITE ASSESSMENT

    ROBINSON TERMINAL NORTH 1 AND 101 ORONOCO STREET

    ALEXANDRIA, VIRGINIA ______________________________________________________________________________

    Prepared for:

    CityInterests, LLC 2900 K Street, NW, Suite 401

    Washington, DC 20007 (202) 944-4710

    Prepared by:

    ICOR, Ltd. PO Box 406

    Middleburg, Virginia 20118 (703) 980-8515

    ICOR Project No. 13-CI.01

    DECEMBER 15, 2014

  • Limited Phase II Environmental Site Assessment, Robinson Terminal North, 1 and 101 Oronoco St., Alexandria, VA

    SIGNATURE SHEET

    This Limited Phase II Environmental Site Assessment for Robinson Terminal North located at 1 and 101 Oronoco Street in Alexandria, Virginia, was prepared by: December 15, 2014 Michael A. Bruzzesi, CPG Date Senior Geologist VA CPG No. 2801 001428 The report was reviewed and approved for release by:

    December 15, 2014 Ike L. Singh Project Manager

    ICOR, Ltd. i December 2014

  • Limited Phase II Environmental Site Assessment, Robinson Terminal North, 1 and 101 Oronoco St., Alexandria, VA

    TABLE OF CONTENTS SIGNATURE PAGE ....................................................................................................................... i 1.0 INTRODUCTION ................................................................................................................ 1 2.0 SITE DESCRIPTION ........................................................................................................... 2 3.0 PROPOSED DEVELOPMENT............................................................................................ 2 4.0 BACKGROUND .................................................................................................................. 3 5.0 RECENT SOIL AND GROUNDWATER ASSESSMENT ................................................ 6

    5.1 Soil Sampling Activities .................................................................................................... 7 5.2 Groundwater Sampling Activities ..................................................................................... 8

    6.0 SITE GEOLOGY AND HYDROGEOLOGY...................................................................... 9 7.0 SOIL AND GROUNDWATER QUALITY ....................................................................... 10

    7.1 Soil Quality ...................................................................................................................... 10 7.2 Groundwater Quality ....................................................................................................... 13

    8.0 SENSITIVE RECEPTORS ................................................................................................. 15 9.0 HUMAN HEALTH RISK ASSESSMENT ........................................................................ 16

    9.1 Soil ................................................................................................................................... 16 9.2 Groundwater .................................................................................................................... 17

    10.0 CONCLUSIONS................................................................................................................. 17 11.0 PROPOSED REMEDIAL ACTIONS AND ENGINEERING AND INSTITUTIONAL

    CONTROLS ....................................................................................................................... 17 FIGURES Figure 1. Site Location Figure 2. Aerial Photograph Figure 3. Site Plan TABLES Table 1A. TEC Soil Analytical Results Table 1B. TEC Groundwater Analytical Results Table 2A. ECS Soil Analytical Results (Detections Only) Table 2B. ECS Groundwater Analytical Results (Detections Only) Table 3. ICOR Test Boring Summary Table 4. Well Construction Information Table 5A. ICOR Soil Analytical Results Table 5B. 2014 Geotechnical Soil Analytical Results Table 6. ICOR Groundwater Analytical Results ATTACHMENTS Attachment 1. Photographs of Phase II Field Activities Attachment 2. Boring Logs Attachment 3. Laboratory Reports of Analysis for ICOR Samples

    ICOR, Ltd. December 2014

  • Limited Phase II Environmental Site Assessment, Robinson Terminal North, 1 and 101 Oronoco St., Alexandria, VA

    1.0 INTRODUCTION This report summarizes the Limited Phase II Environmental Site Assessment (Phase II) activities conducted by ICOR, Ltd. (ICOR) at Robinson Terminal North (herein referred to as the SITE) located at 1 and 101 Oronoco Street in the Alexandria, Virginia. The SITE has a long history of industrial and commercial use and is being considered for development into a multi-story residential complex (eastern portion of the SITE) and multi-story residential and hotel complex (western portion of the SITE), both to include street-level retail and commercial use. Both complexes will also include at least 1 level of subsurface parking. Purchase of the SITE and proposed development is being considered by CityInterests, LLC (CI). CI contracted ICOR to review historical environmental documents and conduct a Phase II to further assess and delineate soil and groundwater impacts at the SITE. The historical data and data generated during the Phase II was used to determine what environmental activities may be required at the SITE, prior to and/or during CI’s proposed development and to achieve regulatory compliance with applicable and Commonwealth of Virginia Department of Environmental Quality (VDEQ) regulations and cleanup criteria for residential or commercial land use. Land use considerations will ultimately be based on the proposed land use of the complex at grade level (street level/first floor level above subsurface parking). At this time, no residential use on the first floor is anticipated. The SITE is currently improved with two large warehouses, gravel and asphalt parking areas, a concrete dock, and landscaping. As indicated by CI, the proposed development will include razing the existing buildings and construction of a multi-story residential and hotel complex with street-level retail and commercial use. The complex is expected to overlie the majority of the property. The complex will also include 1 or 2 levels of subsurface parking underlying the majority of the building footprints, which will require excavation and removal of 7 to 16.5 feet of soil underlying most of the SITE. Based on the findings of historical environmental assessments, hazardous materials requiring special handling and disposal prior to razing of the buildings are present in the buildings, at least three underground storage tanks (USTs) are buried at the SITE, and soil and groundwater beneath the SITE are impacted by the past industrial activities conducted at and adjacent to the SITE. This Phase II only addresses the USTs and soil and groundwater impacts. Past activities of concern conducted at the SITE include petroleum storage and fertilizer production. Adjacent site uses of concern include petroleum storage, chemical production, and coal gasification. Constituents of concern (COCs) identified in soil and groundwater underlying the SITE are mainly related to petroleum fuels; however, metals have been detected at elevated concentrations in some isolated areas. The SITE was the subject to a VDEQ storage tank program required study to assess the three USTs. The SITE is currently in compliance with VDEQ requirements and the case number associated with the USTs was closed. The Phase II activities conducted by ICOR included advancement of test borings, installation of temporary groundwater wells, and collection of soil and groundwater samples for field screening and laboratory analysis. The assessment targeted areas where historical storage and operations of concern were conducted and areas perceived as “data gaps” based on our review of past

    ICOR, Ltd. 1 December 2014

  • Limited Phase II Environmental Site Assessment, Robinson Terminal North, 1 and 101 Oronoco St., Alexandria, VA

    studies. The environmental history of the SITE and Phase II activities and findings are summarized in the following sections. 2.0 SITE DESCRIPTION The SITE is located at 1 and 101 Oronoco Street in Alexandria, Virginia, at the intersection of Oronoco Street and North Union Street. A site location map is included as Figure 1. The SITE is approximately 3.2 acres in size and is comprised of two parcels separated by North Union Street. For the purpose of this report, the parcel situated on the eastern side of North Union Street will be referred to as the Eastern Parcel and the parcel situated on the eastern side of North Union Street will be referred to as the Western Parcel. The SITE is situated in a mixed commercial and residential land use area. Adjacent property use is depicted on the aerial photograph of the SITE included as Figure 2. The SITE is currently improved with two 1-story, slab-on-grade brick and concrete warehouses (totaling approximately 91,800 square feet), a large concrete dock, railroad spur, a small wood- frame shed (near the dock), gravel and asphalt parking areas, and landscaping. The warehouses were constructed in 1966. The warehouse situated on the Eastern Parcel is referred to as Warehouse #10, 11, and 12. The warehouse situated on the Western Parcel is referred to as Warehouse #16. Three diesel USTs are buried on the northeastern portion of the Eastern Parcel and an above ground propane tank is located on the sou

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