Weston Solutions, Inc. 1400 WESTON Way West Chester, PA 19380 610-701-3000  Fax 610-701-3186 www.westonsolutions.com

26 March 2014

U.S. Environmental Protection Agency Region III Attn: Mr. Eugene Dennis On-Scene Coordinatoro 1650 Arch Street Philadelphia, Pennsylvania 19103

Subject: Final Trip Report – Geophysical Investigation

Project: Dwyer Property Groundwater Superfund Site EPA Contract No.: EP-S3-10-05 TDD No.: WS01-11-08-001 Document Control No.: W0075.1A.008779

Dear Mr. Dennis:

Weston Solutions, Inc. (WESTON®) is submitting the final Trip Report for the geophysical investigation conducted at the Dwyer Property Groundwater Supeerfund Site (Site). Thiss Trip Report summarizes field activities, results, conclusions, and recommendations of the investigation. If you have any questions regarding this reeport, please call me at (610) 701-3191.

Sincerely,

WESTON SOLUTIONS, INC,

Projject Task Lead

Enclosure cc: TDD File (Weston – START POC)

AR100274 FINAL TRIP REPORT

GEOPHYSICAL INVESTIGATION DWYER PROPERTY GROUNDWATER SUPERFUND SITE ELKTON, CECIL COUNTY, MARYLAND

EPA CONTRACT NO.: EP-S3-10-05 TECHNICAL DIRECTION DOCUMENT NO.: WS01-11-08-001 DOCUMENT CONTROL NO.: W0075.1A.00879

Prepared For:

U.S. ENVIRONMENTAL PROTECTION AGENCY REGION III HAZARDOUS SITE CLEANUP DIVISION 1650 ARCH STREET PHILADELPHIA, PENNSYLVANIA 19103

Prrepared By

WESTON SOLUTIONS, INC. 1400 WESTON WAY WEST CHESTER, PA 19380 WESTON PROJECT NO.: 20403.012.001.0075.00

MARCH 2014

AR100275 Dwyer Property Groundwater Superfund Site Elkton, Cecil County, Maryland Final Trip Report - Geophysical Investigation

FINAL TRIP REPORT GEOPHYSICAL INVESTIGATION DWYER PROPERTY GROUNDWATER SUPERFUND SITE ELKTON, CECIL COUNTY, MARYLAND

3/26/2014 WESTON - Project Task Lead Date

3/26/2014 WESTON - Project Geophysicist Date

3/26/2014 WESTON - Project Work Scope Manager Date

AR100276 Dwyer Property Groundwater Superfund Site Elkton, Cecil County, Maryland Final Trip Report – Geophysical Investigation

TABLE OF CONTENTS

Section Page

1.0 INTRODUCTION...... 1 2.0 BACKGROUND ...... 2 2.1 SITE LOCATION ...... 2 2.2 SITE DESCRIPTION ...... 2 2.3 SITE HISTORY ...... 2 2.4 PREVIOUS INVESTIGATIONS ...... 3 3.0 SITE ACTIVITIES ...... 5 3.1 UXO AVOIDANCE ...... 5 3.2 GEOPHYSICAL SURVEY ...... 6 3.3 ELECTROMAGNETIC (EM) TERRAIN CONDUCTIVITY SURVEYING METHOD ...... 6 3.3.1 Description ...... 6 3.3.2 Methodology ...... 7 3.3.3 Data Analyses ...... 7 4.0 INVESTIGATION RESULTS ...... 8 4.1 UXO AVOIDANCE RESULTS ...... 8 4.2 EM RESULTS ...... 8 4.2.1 Area of Investigation Results ...... 8 5.0 CONCLUSIONS AND RECOMMENDATIONS ...... 9 6.0 REFERENCES ...... 10

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AR100277 Dwyer Property Groundwater Superfund Site Elkton, Cecil County, Maryland Final Trip Report – Geophysical Investigation

APPENDIX A LIST OF FIGURES

Figure 1: Site Map – Geophysical Investigation Area Figure 2: Site Layout Map Figure 3: Area of Investigation Figure 4: Electromagnetic Survey – EM31 Inphase Plot Figure 5: Electromagnetic Survey – EM31 Conductivity Plot

APPENDIX B LIST OF TABLES

Table 1: Summary of GPS Coordinates for Individual Anomaly Locations

Table 2: Summary of GPS Waypoint Coordinates for Bulk Anomaly Boundary

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AR100278 Dwyer Property Groundwater Superfund Site Elkton, Cecil County, Maryland Final Trip Report – Geophysical Investigation

1.0 INTRODUCTION

Under the Eastern Area Superfund Technical Assessment and Response Team Contract No. EP- S3-10-05, Technical Direction Document No. WS01-11-08-001, the U.S. Environmental Protection Agency (EPA) Region III tasked Weston Solutions, Inc. (WESTON®) to perform a non-intrusive Geophysical Investigation at the Dwyer Property Groundwater Superfund Site (Site) in Elkton, Cecil County, Maryland.

The purpose of the investigation was to conduct UXO avoidance and surface anomaly investigation at the Former Dump Area. In addition, to provide subsurface information necessary to characterize the potential for buried materials identified in and around suspected disposal pits and trenches associated with the Former Dump Area.

The primary objectives were to; 1) Map and attempt identify the footprint (lateral extent and boundary) of the suspected fill; and, 2) Locate and map subsurface anomalies (targets) potentially containing disposal materials (i.e. metallic debris, drums and other facility waste).

The investigation was performed on an approximate 1.13 acre portion of the Site; the Area of Investigation (AOI). The AOI encompasses the Former Dump Area, as defined by a map provided by Maryland Department of the Environment (MDE) personnel familiar with the Site. According to MDE personnel, the Former Dump Area is suspected to contain buried Unexploded Ordnance (UXO) and/or munitions. The AOI and Former Dump Area are depicted on Figure 3, Geophysical Area of Investigation, Appendix A.

Field activities consisted of UXO surface avoidance to identify and mark surficial metallic objects within the investigation area. In addition, WESTON performed an electromagnetic survey of the subsurface using a Geonics Electromagnetic Terrain conductivity meter (EM-31).

This trip report presents Site background information in Section 2.0; summarizes field activities, geophysical instrumentation and methodology in Section 3.0; summarizes the electromagnetic survey results in Section 4.0; and, presents conclusions and recommendations in Section 5.0. All

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AR100279 Dwyer Property Groundwater Superfund Site Elkton, Cecil County, Maryland Final Trip Report – Geophysical Investigation

references cited in this Trip Report are listed in Section 6.0. Figures are provided in Appendix A. Tables are provided in Appendix B.

2.0 BACKGROUND

This section describes the Site location, presents a description of the Site, discusses the Site history, and describes previous investigations conducted at the Site.

2.1 SITE LOCATION

The Site is located within the city of Elkton, in Cecil County, Maryland, as shown in Figure 1, Site Location Map, Appendix A. The Site is located immediately northeast of the intersection of Maryland Route 545/Blue Ball Road and Maryland Route 279/Newark Avenue. The total area of the Site is approximately 73 acres. The geographic coordinates of the approximate center of the Site are 39.61648° north latitude and 75.84404° west longitude.

2.2 SITE DESCRIPTION

The majority of the Site is undeveloped land, either as forest or open fields. Land use adjacent to the Site is undeveloped to the north, with residential and commercial beyond; residential and commercial to the east; commercial, industrial, and agricultural to the south; and industrial to the west. Dogwood Run flows to the southwest along the western portion of the Site into Little Elk Creek. The Rudy Park Public Housing Project and associated recreational area (playground) are located adjacent to the southeast of the Site. Maryland Route 279/ Newark Ave borders the Site to the south. Maryland Route 545/Blue Ball Road borders the Site to the west. The Site and adjacent properties are depicted in Figure 2, Site Layout Map, Appendix A.

2.3 SITE HISTORY

The Site was used for agricultural purposes prior to 1933. In 1933, the Site was purchased by Triumph Fuse and Fireworks Company and used to produce signal flares, fireworks, and various munitions and trinitrotoluene-based explosives (MDE fact sheet). Materials used at this plant included powdered metals, perchlorate, chlorate mixes, barium nitrate, charcoal, sulfur, sulfur

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AR100280 Dwyer Property Groundwater Superfund Site Elkton, Cecil County, Maryland Final Trip Report – Geophysical Investigation

mixes, saltpeter, carbon tetrachloride, hexachlorobenzene, alcohol, picric acid, stearine, dextrin, and potassium perchlorate). The munitions and explosives production continued through World War II as Triumph Fuse and Fireworks Company continued to service both the Army and Navy operations (EPA 2010).

In 1946, the Bowers Battery and Spark Plug Company purchased the Site and used the land to manufacture carbon batteries. In 1948, the Site was sold to Aerial Products, Inc. to resume fireworks and munitions manufacturing until 1958. The president of Aerial Products, Martin Dwyer, purchased the land in 1958 after Aerial Products ceased operations. Mr. Dwyer possibly used the property to continue manufacturing incendiary flares until 1972, while utilizing other parts of the land for cattle grazing. Since 1986, the property has become overgrown with vegetation (MDE fact sheet).

2.4 PREVIOUS INVESTIGATIONS

In March 1989, Maryland Department of the Environment (MDE) completed a Preliminary Site Assessment of the Site, which included the installation and sampling of three groundwater monitoring wells. The laboratory analytical results from the groundwater monitoring wells indicated elevated concentrations of trans-1,2-dichloroethene (maximum 19,200 micrograms per liter [µg/L]), trichloroethylene (TCE) (maximum 15,800 µg/L), and tetrachloroethylene (PCE) (maximum 360 µg/L). A source of the volatile organic compound (VOC) contamination was not identified. Five private wells located north of the Site were sampled but identified no VOC contamination. A Screening Site Investigation was completed by MDE in December 1989 (EPA 2010a).

In September 1994, MDE completed an Expanded Site Inspection (ESI) of the Site, which included sampling of the surface water, sediment, soil, and groundwater. The laboratory results indicated the presence of chlorinated solvents and inorganic contaminants in the Site’s groundwater and various chlorinated solvents in Dogwood Run. Low concentrations of TCE and PCE were detected in the soil, which may be attributed to the contaminated shallow groundwater impacting the overlying soil. No contaminants were detected in any of the neighboring residential wells (MDE fact sheet, EPA 2010a).

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AR100281 Dwyer Property Groundwater Superfund Site Elkton, Cecil County, Maryland Final Trip Report – Geophysical Investigation

In June 1999, MDE completed a Site Survey Report to reassess the status of the site. MDE recommended the site be considered for further investigation by EPA under a future Cooperative Agreement (MDE fact sheet).

In January 2001, MDE completed an ESI that revealed the presence of high concentrations of chlorinated solvents in the upper part of the aquifer. This may indicate the presence of Dense Non-aqueous Phase Liquid onsite (MDE fact sheet).

In April 2002, MDE contracted Environmental Service and Technology Corporation (ENSAT) to manage an exploratory soil boring program as the initial phase of further characterization and potential remediation of the VOC contamination of the groundwater onsite. Nine borings were advanced to the overburden/saprolite interface to gain stratigraphic information across the Site. Groundwater samples collected during boring advancement revealed elevated levels of VOCs (MDE fact sheet).

In April 2003, the second phase of the ENSAT groundwater investigation began with the installation of ten additional monitoring wells in the areas of contamination identified during the April 2002 investigation (MDE fact sheet).

In January 2004, Membrane Interface Probe (MIP) Technology was used to delineate the soil and groundwater contamination from chlorinated solvents onsite. The investigation indicated two distinct areas of TCE contamination: one in the north-central portion of the Site and the other near the northeast portion of the Site (EPA 2010a).

In August 2005, MDE completed a Remedial Investigation/Feasibility Study that included a review of existing data, a test pit investigation, soil sampling, and collection of groundwater from 15 monitoring wells. The test pit investigation was performed in areas where underground storage tanks or other fluid storage containers were suspected, near a suspected drum dump, and at areas with tin can piles and flare canisters. No TCE was detected in any of the test pit soils. PCE was detected at low concentrations, but this may be attributed to contaminated shallow groundwater (EPA 2010a).

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AR100282 Dwyer Property Groundwater Superfund Site Elkton, Cecil County, Maryland Final Trip Report – Geophysical Investigation

In March 2010, an Expanded Remedial Investigation (ERI) was submitted to EPA. The activities during this investigation included the installation of 44 monitoring wells, well and wellhead replacement activities, five groundwater sampling events, five additional MIP surveys, installation of 33 soil borings, and a series of monitoring well and stream gauge station gauging events. The ERI did not identify a source of the groundwater plume (EPA 2010a).

In November 2011, EPA conducted a removal site evaluation at the Site. The evaluation included the installation of temporary monitoring wells and soil vapor sampling points to evaluate the potential for vapor intrusion from the groundwater contamination plume to the Rudy Park housing development. In addition, soil samples were collected from the playground associated with Rudy Park. Results of the evaluation did not indicate groundwater VOC concentrations at levels that pose a vapor intrusion risk. In addition, no concentrations of VOCs, SVOCs, or metals above background levels were indicated in the soil samples collected from the playground (WESTON, 2012a).

3.0 SITE ACTIVITIES

From November 26th to November 28th, 2012, WESTON conducted geophysical investigation activities as outlined in the Dwyer Property Geophysical Investigation Work Plan, dated November 2012 (WESTON, 2012b). All activities were completed, as described below, except for the Ground Penetrating Radar survey. At the discretion of the On-Scene Coordinator, that may be completed at a later date. WESTON documented site activities in accordance with WESTON SOP No. 101, “Logbook Documentation” (WESTON 2006a). This section discusses the field activities conducted during this investigation.

3.1 UXO AVOIDANCE

On November 26th and 27th, 2012, WESTON conducted non-intrusive UXO surface avoidance activities within the AOI at the Site, to investigate the surface for potential UXO and/or ordnance. Two UXO techs traversed the AOI in east-west transects with ferrous metallic locating equipment (Schonstedt 52C). Any ferrous metallic objects encountered at the surface were flagged and investigated with soft-dig techniques. The raised, mounded areas of the AOI,

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AR100283 Dwyer Property Groundwater Superfund Site Elkton, Cecil County, Maryland Final Trip Report – Geophysical Investigation

where waste dumping was clearly evident due to observable trash at the ground surface, were investigated in detail. The results of the UXO Avoidance and surface anomaly investigation are discussed below in section 4.1.

3.2 GEOPHYSICAL SURVEY

On November 28th, 2012, a WESTON geophysical crew conducted a non-intrusive digital geophysical mapping investigation of the AOI at the Site. The survey was conducted in accessible and cleared areas along linear east-west transects spaced approximately 10 to 15 feet apart. The field team traversed these transects as closely as possible while operating the EM-31. The transects are depicted on Figure 3, Geophysical Area of Investigation, Appendix A. The field team used a Trimble GeoXH 6000 Global Positioning System (GPS) unit to navigate the site and maintain traverse spacing across the survey area to ensure comprehensive data coverage.

The EM-31 data was interfaced directly with the GPS to obtain real-time differential positioning and sub-meter accuracy. Geophysical data tracks were mapped interactively using the GPS unit. The positional coordinates for each data set were referenced to the WGS84/UTM zone 18N coordinate System, (feet).

3.3 ELECTROMAGNETIC (EM) TERRAIN CONDUCTIVITY SURVEYING METHOD

3.3.1 Description

The EM survey was conducted using a Geonics, Ltd. EM31-MK2 terrain conductivity meter. The EM31-MK2 is battery-powered and operates at a frequency of 9.8 kilohertz. This system consists of a transmitting coil (primary field source), receiving coil (sensor), phase sensing circuits, and an amplifier. A fixed 3.7-meter inter-coil spacing is standard for the EM31-MK2. The instrument measures apparent conductivity in units of milli-siemens per meter (mS/m) in materials with true conductivity ranging up to 1,000 mS/m.

The EM31-MK2 data were collected in both the inphase and quadrature modes. The inphase component (relative conductivity values) has a greater sensitivity to buried metal objects. As a

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AR100284 Dwyer Property Groundwater Superfund Site Elkton, Cecil County, Maryland Final Trip Report – Geophysical Investigation

result, in several areas where substantial mixed fill material and debris were evident, the inphase data shows a significantly better response in detecting and mapping the buried metallic fill material than the quadrature. The quadrature component is sensitive to conductors with low induction numbers (i.e., low conductivity materials) and measures the conductivity of the subsurface materials and structure. As a result the conductivity data shows a significantly better response in mapping the underlying geology.

3.3.2 Methodology

Prior to conducting the survey, the EM31-MK2 was nulled and calibrated in accordance with the instrument-operating manual (Geonics 1995). The effective depth of exploration associated with this mode of operation is approximately 18 feet (McNeill, 1980), as measured from the center point of the transmitter/receiver coils.

The EM31-MK2 survey was performed as follows:

1. Conductivity measurements were obtained in the vertical dipole mode along traverses spaced approximately 10 to 15-feet apart. 2. EM measurements were recorded continuously for both the inphase and quadrature modes at approximately 2.5-foot intervals as the operator traversed each line. 3. The measurements were digitally recorded and stored in memory of an Allegro data logger. The data in memory were downloaded from the data logger to a field computer. 4. A total of 6,329 linear feet, comprised of 20,928 EM data points, was collected and logged across the property.

3.3.3 Data Analyses

Prior to departure from the site, the EM-31 data was backed up and a field contour plot of the data was generated on site using Dat31 and Geosoft, OASIS montaj software. The plot, presented in Figure 4, EM31 Inphase Plot, Appendix A, shows the mapped fill boundaries and

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AR100285 Dwyer Property Groundwater Superfund Site Elkton, Cecil County, Maryland Final Trip Report – Geophysical Investigation

anomalies of interests. This process allowed the geophysicist to identify anomalies indicative of buried conductive materials, and perform a field QC check.

4.0 INVESTIGATION RESULTS

The following section summarizes the findings, data, and results of the geophysical investigation. EM terrain conductivity plots for the inphase and quadrature components are presented in Figure 4, EM31 Inphase Plot, and Figure 5, EM31 Conductivity Plot, Appendix A.

4.1 UXO AVOIDANCE RESULTS

No UXO or ordnance was identified on the ground surface within the AOI. Numerous ferrous objects were identified during the avoidance activities but all were related to trash and associated dumping at the Site. In addition, several rusted and heavily corroded drums were identified on the surface. The drums did not contain any observable wastes or other materials.

Although no UXO was identified on the surface, buried UXO and/or ordnance may be present in buried pits or trenches at the Site. Therefore, any intrusive work conducted at the Site should be conducted with UXO construction support (at a minimum) to ensure the safety of site personnel.

4.2 EM RESULTS

EM terrain conductivity measurements vary throughout the Site confirming the presence of metallic debris in the subsurface, varying soil types and moisture conditions. Gradual excursions (increases or decreases) in the background conductivity typically represent gradational changes in the soil composition and moisture content. In contrast, abrupt changes or steep conductivity gradients are typically produced by anthropogenic sources such as buried fill material/metal or cultural features.

4.2.1 Area of Investigation Results

Relative background values for inphase component (shown in the color scale, Figure 4, EM31 Imphase Plot, Appendix A), range from -1.6 to -0.3 parts per thousand (ppt), and indicate the absence of buried metal in these portions of the Site. In contrast high positive and extremely low

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AR100286 Dwyer Property Groundwater Superfund Site Elkton, Cecil County, Maryland Final Trip Report – Geophysical Investigation

inphase values represented by violet and dark blue color contours indicate the locations and extent of the buried metallic objects or debris. The inphase data clearly mapped and defined the lateral limits (primarily to the north and east) of suspected buried metallics, depicted by the yellow polygon shown in Figure 4, EM31 Inphase Plot, Appendix A.

The fill boundary appears to extend west and south beyond the surveyed area which was actually expanded 50 feet in each direction beyond the planned area of investigation. The yellow polygon encompasses an area measuring 28,595 ft.2 or approximately 0.66 acres. Twenty one discrete anomalies shown on Figures 4 and 5 were detected in the AOI. Each anomaly or target represents a location where a significant extreme low or high amplitude response was measured. While the size and amplitude of the anomalies do not suggest the presence of bulk or large buried deposits, these targets are most likely to be associated with scattered concentration of shallow buried metal or metallic surface debris observed during the investigation. GPS coordinates for the twenty one anomalies are summarized in Table 1, Appendix B. Background conductivity (quadrature component) measurements throughout the Site, related to geology, range from 2 to 15 mS/m, as shown in the color scale, Figure 5, EM31 Conductivity Plot, Appendix A.

Two prominent features are evident in the plot. The first feature, identified in the legend as a potential paleo-structure, is a classic example of an underlying geologic structure, possibly a paleo-channel. The second feature is the yellow polygon encompassing the high positive and extremely low conductivity anomalies represented by violet and dark blue color contours, respectively. This boundary marks the lateral extent of buried conductive debris and other suspected man-made metallic objects as mapped by the quadrature component.

5.0 CONCLUSIONS AND RECOMMENDATIONS

Based on the results of the UXO avoidance and EM survey, the following conclusions are presented:

 No UXO or ordnance was identified on the ground surface within the AOI. However, UXO and/or ordnance may be present in buried pits and/or trenches. Any intrusive work should be conducted with UXO construction support, at a minimum.

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AR100287 Dwyer Property Groundwater Superfund Site Elkton, Cecil County, Maryland Final Trip Report – Geophysical Investigation

 EM terrain conductivity measurements vary throughout the Site confirming the presence of metallic debris in the subsurface, varying soil types and moisture conditions. Gradual excursions (increases or decreases) in the background conductivity typically represent gradational changes in the soil composition and moisture content. In contrast, abrupt changes or steep conductivity gradients are typically produced by anthropogenic sources such as buried fill material/metal or cultural features. Both gradual and abrupt conductivity gradient changes were noted within the AOI at the Site.

 Relative background values for inphase component range from -1.6 to 0.3 ppt, and indicating the absence of buried metal in these portions of the Site. Background conductivity (quadrature component) measurements throughout the Site as it relates to geology range from 2 to 15 mS/m.

 The inphase data clearly mapped and defined the lateral limits of suspected buried metallics, depicted by the yellow polygon shown in Figure 4. The yellow polygon encompasses an area measuring approximately 0.66 acres.

 Twenty-one discrete anomalies shown in Figures 4 were detected in the AOI. While the size and amplitude of the anomalies do not suggest the presence of bulk or large buried deposits, these targets are most likely to be associated with scattered concentration of shallow buried metal or metallic surface debris observed during the investigation.

Based on these findings, WESTON presents the following recommendations:

 Expand the EM-31 investigation area to the west and south to define the limits of fill in each direction. Perform limited vertical radar profiling across selected and cleared transects based on the existing EM-31 data.

 Because the EM survey is a non-intrusive method, actual "ground truth" of the geophysical data can only be ascertained from physical characterization of the subsurface material using intrusive methods (e.g. test pits, trenches, or soil borings). It is recommended that the anomalies be investigated, with UXO construction support, to confirm their source.

6.0 REFERENCES

EPA. 2010. “HRS Documentation Record: Dwyer Property Ground Water Plume”. October.

Geonics, Ltd. 1995. Operating Manual for EM31-MK2.

Maryland Department of the Environment (MDE). “Site Fact Sheet: Little Elk Creek Area-Wide One Cleanup Program Pilot Project. Dwyer Property”.

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AR100288 Dwyer Property Groundwater Superfund Site Elkton, Cecil County, Maryland Final Trip Report – Geophysical Investigation

McNeill, J.D. 1980. “Electromagnetic Terrain Conductivity Measurements at Low Induction Number.” Technical Note TN-6, Geonics, Ltd., Mississauga, Ontario.

U.S. Geological Survey (USGS). 1972. 7.5-Minute Series Topographic Quadrangle. Newark West, Maryland.

USGS. 1982. 7.5-Minute Series Topographic Quadrangle. Elkton, Maryland

WESTON. 2012a. Final Trip Report, Removal Site Evaluation. Dwyer Property Groundwater Superfund Site. August.

WESTON. 2012b. Geophysical Investigation Work Plan. Dwyer Property Groundwater Superfund Site. November.

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AR100289 Dwyer Property Groundwater Superfund Site Elkton, Cecil County, Maryland Final Trip Report – Geophysical Investigation

APPENDIX A (FIGURES)

AR100290 Site Boundary

Data Sources: USGS 7.5-Minute Series Topographic Quadrangles: Dwyer Property Site Elkton, Maryland, 1982; Newark West, Maryland, 1972 Elkton, Cecil County, Maryland NY Quadrangle Location = Coordinate System: NY NY WGS_1984_Web_Mercator_Auxiliary_Sphere PA Projection: Mercator_Auxiliary_Sphere Figure 1 Site Location Map NJ GCS_WGS_1984 Datum: D_WGS_1984

0 1,000 2,000 TDD#: WS01-11-08-001 WV MD Contract: EP-S3-10-05 Feet ´ Prepared: 9/7/2011 VA DE

File: Y:\EPA_Region_III\DwyerPropertySite\MXD\site_location.mxd, 9/7/2011 1:26:21 PM, zieglera AR100291 Brooks Ln

Dogwood Rd

Blue Ball Rd / Route 545

n u

R

od wo og D

Newark Ave / Route 279

Data Sources: Dwyer Property Site Basemap: Digitized data from EPA Initial Proposed Residential Well Sample Locations Elkton, Cecil County, Maryland Legend Imagery: Bing Imagery Service

Stream Coordinate System: WGS_1984_Web_Mercator_Auxiliary_Sphere Dwyer Site Boundary Figure 2 Projection: Mercator_Auxiliary_Sphere Site Layout Map Rudy Park Recreational Area GCS_WGS_1984 Rudy Park Development Datum: D_WGS_1984 0 375 750 TDD#: WS01-11-08-001 Contract: EP-S3-10-05 ´ Feet Prepared: 1/6/2012 File: Y:\EPA_Region_III\DwyerPropertySite\MXD\site_layout.mxd, 1/6/2012 11:22:51 AM, zieglera AR100292 Brooks Ln

Dogwood Rd

Blue Ball Rd / Route 545

Dogwood Run

Newark Ave / Route 279

Legend Data Sources: Dwyer Property Site Basemap: Digitized data from EPA Initial Proposed Stream Residential Well Sample Locations Elkton, Cecil County, Maryland Imagery: Bing Imagery Service Transects (10 ft) Dwyer Site Boundary Coordinate System: WGS_1984_Web_Mercator_Auxiliary_Sphere Figure 3 Rudy Park Recreational Area Projection: Mercator_Auxiliary_Sphere Geophysical Area of Investigation Rudy Park Development GCS_WGS_1984 Datum: D_WGS_1984

Former Dump Area 0 300 600 TDD#: WS01-11-08-001 Contract: EP-S3-10-05 Area of Investigation (1.13 Acres, 49,324 sq ft) Feet Prepared: 2/18/2013

File: Y:\EPA_Region_III\DwyerPropertySite\MXD\Dump_Area_Transects.mxd, 2/18/2013 12:11:25 PM, ricksc AR100293 Legend Dwyer Property Site Elkton, Cecil County, Maryland Area of Investigation Scale 1: 720 Former Dump Area 25 0 25 50 75 Boundary of Bulk Anomalies US Survey foot Figure 4 21 EM31 Inphase Plot Individual Anomaly 30 Boundary Waypoint Coordinate System: TDD#: WS01-11-08-001 WGS_1984_UTM Zone 18 Contract: EP-S3-10-05 Prepared: 2/27/2013

File: Y:\EPA_Region_III\DwyerPropertySite\MXD\EM31_Inphase.mxd, 2/27/2013 12:10:48 PM, ricksc AR100294 Legend Dwyer Property Site Elkton, Cecil County, Maryland Area of Investigation Scale 1: 720 Former Dump Area 25 0 25 50 75 Boundary of Bulk Anomalies US Survey foot Figure 5 21 EM31 Conductivity Plot Individual Anomaly Potential Paleo-structure (i.e. old channel deposit) Coordinate System: TDD#: WS01-11-08-001 WGS_1984_UTM Zone 18 Contract: EP-S3-10-05 Prepared: 2/27/2013

File: Y:\EPA_Region_III\DwyerPropertySite\MXD\EM31_Conductivity.mxd, 2/27/2013 12:24:20 PM, ricksc AR100295 Dwyer Property Groundwater Superfund Site Elkton, Cecil County, Maryland Final Trip Report – Geophysical Investigation

APPENDIX B (TABLES)

AR100296 Dwyer Property Groundwater Superfund Site Elkton, Cecil County, Maryland Final Trip Report – Geophysical Investigation

Table 1

Summary of GPS Coordinates

Individual Anomaly Locations

Target ID Easting b (m) Northing b (m) (Figures 4 and 5) a 1 1402940.58 14389638.51 2 1402932.53 14389664.10 3 1402925.95 14389639.25 4 1402877.71 14389652.40 5 1402827.26 14389668.49 6 1402820.68 14389652.40 7 1402806.79 14389653.14 8 1402801.68 14389631.94 9 1402800.94 14389616.58 10 1402736.61 14389617.31 11 1402746.12 14389634.13 12 1402727.84 14389648.02 13 1402762.93 14389664.10 14 1402742.46 14389671.41 15 1402697.87 14389653.14 16 1402694.94 14389685.30 17 1402684.71 14389709.43 18 1402672.28 14389680.92 19 1402678.86 14389631.94 20 1402711.76 14389600.50 Notes: m = meter a Target locations shown on Figures 4 and 5 b Coordinate System, UTM/NAD83, Zone 18North (meters)

AR100297 Dwyer Property Groundwater Superfund Site Elkton, Cecil County, Maryland Final Trip Report – Geophysical Investigation

Table 2

Summary of GPS Waypoint Coordinates

Bulk Anomaly Boundary

Target ID Easting b (m) Northing b (m) (Figure 4) a 22 1402660.18 14389625.36 23 1402659.39 14389709.09 24 1402688.10 14389736.21 25 1402704.85 14389701.92 26 1402726.38 14389694.74 27 1402787.78 14389688.36 28 1402815.70 14389689.16 29 1402845.21 14389688.36 30 1402870.73 14389699.52 31 1402948.09 14389670.02 32 1402960.85 14389638.12 33 1402941.71 14389621.37 34 1402857.97 14389622.17 35 1402842.02 14389594.25 36 1402830.85 14389572.72 Notes: m = meter a Waypoint locations shown on Figure 4. b Coordinate System, UTM/NAD83, Zone 18North (meters)

AR100298