HomeMy WebLinkAbout20001_North_Graham_Geophysical_Report_20131007
P.O. Box 5884 • Winston-Salem, NC 27113-5884
Office 336.722.9999 • Fax 336.722.9998
October 7, 2013
Mr. Ed Tam
Belleau Wood Development, LLC
415 Pisgah Church Road, #363
Greensboro, North Carolina 27455
Subject: Geophysical Survey Report
Former Tarheel Army Missile Plant
Intersection of North Graham Hopedale Road and North Church Street
Burlington, Alamance County, North Carolina
Progress Project No.: 1013130.001
Dear Mr. Tam:
Progress Environmental, Inc. (Progress) is pleased to submit this Geophysical Survey Report for
the former Tarheel Army Missile Plant (TAMP) property located in the northeast quadrant of North
Graham Hopedale Road and North Church Street in Burlington, Alamance County, North Carolina
(Figure 1). The purpose of the geophysical survey was to determine whether subsurface anomalies
or buried debris were present at the site.
INTRODUCTION
The site is approximately 9.64 acres and consists of a paved parking lot and inactive railroad spur.
The Alamance County Geographic Information System identifies the parcel as 147805. Progress
previously completed a review of the available North Carolina Department of Environment and
Natural Resources (NCDENR) files on the CARA Portal and historical aerial photographs.
FIELD ACTIVITIES
A geophysical survey was completed on September 27, 2013 by Geo Solutions, Ltd. to determine if
“orphaned” USTs, anomalies, or if evidence of buried debris was present beneath the site. The
geophysical survey identified two unknown anomalies on the northeastern portion of the site.
Additional structural anomalies were not identified. A copy of the geophysical survey report is
included in the Appendix.
CONCLUSIONS AND RECOMMENDATIONS
If impacted soil, USTs, or hazardous materials are encountered during future redevelopment activities,
they should be handled and disposed in accordance with current NCDENR rules and regulations.
Additional investigation would need to be completed in an effort to identify the type or contents of the
buried anomalies on the northeastern portion of the site. Progress recently completed the field activities
related to a Limited Soil and Groundwater Assessment at the site, including assessment in the general
vicinity of the anomalies. The findings of the Limited Soil and Groundwater Assessment will be
provided under separate cover.
Geophysical Survey Report October 7, 2013
Former TAMP
Progress Project No. 1012103.002
2
CLOSING
This report is intended for the use of Belleau Wood Development, LLC subject to the contractual
terms agreed to for this project. Reliance on this document by any other party is forbidden without
the express written consent of Progress, and that party's acceptance of mutually agreeable terms
and conditions. Use of this report for purposes beyond those reasonably intended by Belleau Wood
Development, LLC and Progress will be at the sole risk of the user.
We appreciate your selection of Progress for this project and look forward to assisting you further
on this and other projects. If you have any questions, please do not hesitate to contact us at (336)
722-9999.
Sincerely,
PROGRESS ENVIRONMENTAL, INC.
Jason T. Ricks Jeffrey A. Ballsieper, L.G.
Senior Environmental Scientist Director of Environmental Services
Attachments: Figure 1 – Topographic Site Map
Geophysical Survey Report
FIGURE
Figure 1
Topographic Site Map
Former TAMP
Intersection of North Graham Hopedale Road and North Church Street
Burlington, Alamance County, North Carolina
Project: Fmr. TAMP
Client: Belleau Wood Dev.,
LLC
Progress Job #: 1013130.001
P.O. Box 5884
Winston-Salem, NC 27113
Telephone: (336) 722-9999
Fax: (336) 722-9998
www.progressenvironmental.com
USGS 7.5 Minute Series Topographic Map
Contour Interval: 10 feet
Scale: 1” = 2000’
Burlington, N.C.
Date: 1969, Photorevised 1981
Date: October 2013
SITE
Site
GEOPHYSICAL SURVEY REPORT
September 30, 2013
Jason Ricks
Progress Environmental, Inc.
P.O. Box 5884
Winston-Salem, North Carolina 27113-5884
Re: Geophysical Investigation of Potential Underground Storage Tanks, N.
Graham-Hopedale Rd, Burlington, North Carolina
Dear Mr. Ricks:
Geo Solutions Limited, Inc. (Geo Solutions) is pleased to submit this report of findings
for a geophysical survey completed on September 27, 2013 at a large parking lot site
along Church St. and N. Graham-Hopedale St., Burlington, North Carolina.
Figure 1. Aerial photograph of the site showing grounds outlined in yellow.
Background
The site is an approximately 10-acre vacant asphalt/concrete parking lot with railroad
tracks bisecting the lot diagonally from southeast to northwest.
Progress Environmental (PE) is currently conducting an Environmental Assessment at the
site. The location of underground features (i.e., buried debris or below ground tanks) is
not known. As such, PE hired Geo Solutions to complete a limited geophysical
evaluation over the area utilizing a portable multifrequency electromagnetic (EM)
profiler and ground-penetrating radar (GPR) equipped with the appropriate antenna
determined by site conditions.
Site Activities
Geo Solutions completed two types of geophysical surveys as part of the geophysical
investigation:
1. Geo Solutions completed a detailed EM evaluation (survey lines spaced at
approximately 8-ft and data points every 0.5 feet along each profile line). These
data were collected utilizing a Geophex Model GEM-2. The location of the data
points were measured utilizing a CSI GPS that directly records the location of
each EM data point (Figure 2). From this data, Geo Solutions prepared a site map
illustrating the distribution of in-phase (metal detection mode) and quadrature
(apparent conductivity) values (Figures 3 - 5).
2. Geo Solutions also completed a limited Ground-penetrating radar (GPR)
evaluation of portions of the site where anomalous EM results indicate potential
buried debris or utilities.
Results
EM Evaluation
The EM results are presented in Figures 3, 4, and5.
Figure 3 illustrates the results of the 9810 Hz in-phase data. This information is generally
used to indicate the location of buried metal material. This would include but not limited
to: buried concrete with metal reinforcement, buried underground storage tanks (USTs),
septic tanks, and utilities. The sanitary sewer lines and metal drain grates are the
dominate features causing anomalies here. As such, the EM in-phase mode indicates
their presence in red and orange hues.
Figure 4 illustrates the results of 45330 Hz in-phase data collected at the site, but the
increased frequency enables imaging of potentially deeper anomalies. Like Figure 3, the
presence of the sewer lines and metal grate drains depict strong in-phase anomalies.
Figure 5 illustrates the results of the total conductivity data. Here a large anomaly in the
northeast corner of the survey area is present. This area represents a localized change in
the soil conductivity. The source of this apparent change is unknown.
Additional anomalies for the in-phase and conductivity modes are present along other
portions of the site, and are noted in each figure. Here, the sidewalks are reinforced with
wire mesh, metal fencing surrounds the property, and a railway bisects the area
diagonally from southeast to northwest.
GPR Evaluation
Geo Solutions completed GPR evaluations over all areas containing anomalous EM (in-
phase and conductivity values) to search for potential buried underground storage tanks
(USTs). Geo Solutions did verify each anomalous EM feature to determine if the
response was the cause of an under-ground storage tank (UST) or other buried debris.
A site, located in the northeast corner of the facility contained a below ground feature of
unknown origin. Geo Solutions marked the perimeter of this feature on the ground using
orange marking paint.
Summary and Recommendations
Geo Solutions did not find evidence for the presence of USTs. Several underground
features associated with sanitary sewer lines and other utilities were observed and an
unknown buried feature.
All anomalous geophysical sites can be attributed to the presence of existing utilities and
the presence of metal drains, fencing, light poles, and railroad tracks except marked as
unknown.
No additional geophysical investigations are recommended to evaluate the site.
However, we do recommend additional evaluations be conducted at the unknown buried
feature on the northeast portion of the property..
Geo Solutions is pleased to be provided this opportunity, please give me a call should you
have questions concerning the above.
Very truly yours,
GEO SOLUTIONS LIMITED, INC.
Ronald A. Crowson
Geophysicist
FIGURES 2, 3, 4, and 5