WS-88501_95335_CA_MRP_20150727

P.O. Box 5884 • Winston-Salem, NC 27113-5884
Office 336.722.9999 • Fax [phone]

July 27, 2015

Ms. Connie Miller
Piedmont Sheet Metal
801 North Broad Street
Winston-Salem, North Carolina 27101

Subject: Letter Report of Environmental Services
Clawson Street AST Release
2307 Clawson Street
Winston-Salem, Forsyth County, North Carolina
Progress Project No. 1015005.002

Dear Ms. Miller:

Progress Environmental, Inc. (Progress) is pleased to provide this Letter Report of Environmental Services
related to a surficial release of heating oil at a residence located at 2307 Clawson Street in Winston-Salem,
North Carolina. Progress previously completed and submitted an Initial Abatement Action Report with
respect to the release (Progress Project No. 1015005.001, dated January 20, 2015).

INTRODUCTION

Progress was contracted by Piedmont Sheet Metal to perform soil remediation and cleanup activities
associated with the release from an aboveground storage tank (AST) located at 2307 Clawson Street in
Winston-Salem, Forsyth County, North Carolina (Figure 1). The site consists of a single-family residence.
The site is located in an area of Winston-Salem that is developed with residential properties. The water
supply to the site and the surrounding area is provided by municipal water; however, evidence of water-
supply wells was present in the area.

On January 6 and 7, 2015, Progress and A&D Environmental Services, Inc. (A&D) were on-site to excavate
the accessible impacted soil from beneath the former AST location and remove the impacted soil from the
vicinity of the AST. Free product and impacted plastic sheeting from the crawl space was also removed.
Piedmont Sheet Metal personnel evacuated approximately 30 gallons of heating oil from the AST using a
hand pump prior to the AST being moved to a new location to allow for soil remediation activities. The
AST was relocated to a location immediately north of the previous location and reconnected by Piedmont
Sheet Metal personnel. A&D excavated the accessible impacted soil using a mini-trackhoe. Progress
personnel provided oversight during excavation activities. The source of the release appeared to be the
result of a faulty plug on the bottom of the AST. Following the removal of the accessible contaminated
soil, evidence of remaining soil contamination was observed on the sidewalls and the base of the excavation.
The free product and minor amounts of impacted soil and debris were removed from the crawl space and
sump pump reservoir using a vacuum truck and absorbent pads. The concrete floor in the crawl space was
cleaned using a pressure washer and the generated sludge was removed using the vacuum truck.

Letter Report of Environmental Services Progress Project No. 1015005.002
Clawson Street AST Release July 27, 2015
2307 Clawson Street
Winston-Salem, Forsyth County, North Carolina

2

Free product was recovered from an inoperable sump located proximal to the furnace and water heater. Free
product appeared to be weeping into the crawlspace from behind a finished concrete surface. Progress placed
absorbent pads along the area where free product appeared to be entering the crawlspace. Additionally,
absorbent pads were placed in the sump to recover fluids that entered the sump. On January 13, 2015 Progress
returned to the site to replace the absorbent pads. Continued evidence of free product intrusion was observed
at that time. Please note, evidence of soil contamination within the crawlspace was not observed. Progress
was unable to determine the pathway of contamination from the heating oil release to the crawlspace.

Progress was on site on April 30, 2015 to collect additional soil samples to be analyzed for volatile organic
compounds (VOCs) using EPA Method 8260/5035 and semi-volatile organic compounds (SVOCs) using
EPA Method 8270BNA, as requested by Ms. Karen Hall of the North Carolina Department of Environment
and Natural Resources (NCDENR) in a letter dated April 24, 2015 (attached). The NCDENR requested
that two additional soil samples be collected from the northern boundary and the approximate center of the
former excavation from a depth of fifteen feet below land surface (bls). Please note, the previously
completed excavation was restricted based on the presence of underground utilities (electric and phone),
the residence to the east, and a chain link fence to the west. Therefore, Progress was limited to collecting
soil samples from the approximate center of the former excavation and from the southern limits of the
excavation.

The soil borings were advanced using a decontaminated hand auger. Progress advanced one soil boring
(B-2) in the approximate center of the former excavation to an approximate depth of thirteen feet below
land surface (bls). Soil sample B-2-13 was collected from soil boring B-2 at an approximate depth of 13
feet bls. Observations made at the time the soil boring was advanced indicated that the soil boring was
advanced beyond the limits of the former excavation and into residual material. Soil boring S-2 was
advanced along the southern side of the former excavation to an approximate depth of nine feet bls.
Progress terminated the soil boring at an approximate depth of nine feet based on the absence of visual or
olfactory evidence of soil contamination. Please note, evidence of residual soil contamination was observed
during the advancement of soil boring S-2; however, the evidence of contamination appeared to dissipate
at an approximate depth of eight feet bls. The soil borings were backfilled with soil cuttings.

The samples were delivered under chain-of-custody to Research and Analytical Laboratories, Inc. (R&A)
in Kernersville, North Carolina for analysis for VOCs using EPA Method 8260/5035 and SVOCs using
EPA Method 8270BNA.

Laboratory analysis of the soil samples did not detect VOCs or SVOCs at concentrations that exceed the
laboratory’s detection limits. Based on the results of the laboratory analysis, Progress determined that the
vertical extent of the soil contamination in excess of the applicable Soil-to-Groundwater Maximum Soil
Contaminant Concentrations does not persist at a depth of thirteen feet below land surface in the
approximate center of the former excavation. Additionally, laboratory testing indicated that residual soil
contamination does not persist to the south of the former excavation at an approximate depth of nine feet
bls.

FIELD ACTIVITIES

On July 2, 2015, 3D Environmental Investigations, LLC (3D) mobilized a track-mounted Geoprobe® drill rig
to install a two-inch monitoring well in the vicinity of the former heating oil AST. The apparent water table
was encountered at approximately 20 feet during drilling; therefore, a permanent monitoring well was
Letter Report of Environmental Services Progress Project No. 1015005.002
Clawson Street AST Release July 27, 2015
2307 Clawson Street
Winston-Salem, Forsyth County, North Carolina

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installed. Soil samples were not collected during the advancement of the soil boring. A boring log for soil
boring MW-1 is included in Appendix A.

A permanent two inch monitoring well (MW-1) was installed to an approximate depth of 30 feet bls with
20 feet of 0.01 slotted Schedule 40 PVC screen using solid-stem augers. Progress returned to the site in the
afternoon to collect a groundwater sample from the monitoring well. The groundwater sample was collected
using a disposable bailer and new length of cord and transferred to laboratory containers and delivered
under chain-of-custody to Research and Analytical Laboratories in Kernersville, North Carolina.

LABORATORY TEST RESULTS

The groundwater sample collected from monitoring well MW-1 was analyzed for VOCs using EPA Method
602, for SVOCs using EPA Method 625BNA plus ten tentatively identified compounds (TICs) by library
search, and for volatile and extractable petroleum hydrocarbons (VPH and EPH) using the Massachusetts
Department of Environmental Protection (MADEP) Methods. Laboratory analysis of the groundwater
sample collected from monitoring well MW-1 detected total xylenes (2.93 µg/L) at a concentration not
exceeding its North Carolina 2L Groundwater Quality Standard (NC2LGWQS). Copies of the monitoring
well construction record and a monitoring well diagram are included in Appendix A.

CONCLUSIONS AND RECOMMEDATIONS

The laboratory results of the groundwater sample collected from monitoring well MW-1 installed in the
vicinity of the former excavation do not indicate targeted compounds at concentrations exceeding their
respective NC2LGWQS. Progress recommends that a copy of this report be provided to the NCDENR for
their review.

We appreciate your selection of Progress for this project and look forward to the opportunity to assist you
in the future. If you have any questions or need additional information, please contact Jeff Ballsieper at
[phone].

Sincerely,

PROGRESS ENVIRONMENTAL, INC.

Joseph S. Lawson, III Jeffrey A. Ballsieper, L.G.
Director of Ecological Services Director of Environmental Services
NC Licensed 1653

Attachments: Figure 1 Topographic Site Map
Figure 2 Monitoring Well Location Map
Boring Log
Well Construction Record
Laboratory Analytical Results and Chain-of-Custody
Figure 1
Topographic Site Map

2307 Clawson Street
Winston-Salem, North Carolina

P.O. Box 5884
Winston-Salem, NC 27113
Telephone: [phone]
Fax: [phone]
www.progressenvironmental.com

USGS 7.5 Minute Series Topographic Map
Contour Interval: 10 feet
Scale: 1” = 2000’
West Winston-Salem, N.C.
Date: 1951, Photorevised 1994
Project: Clawson Street

Client: Piedmont Sheet Metal
Progress Job #: 1015005.002
Date: July 2015

SITE
Site
0'30'
REV
0
DRAWING TITLE
DRAWING NUMBER
BY DATEREV
DR.: JAB JULY 15
CK.:
APP'D.:
SCALE: 1" = 30'
GRAPHIC SCALE
30'60'
PROGRESS NO.: 1015005.002
1" = 30'
%db
(
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www.progressenvironmental.com Figure 2
P.O. Box 5884
Winston-Salem, North Carolina 27113
[phone]
Progress
Environmental, Inc.
MONITORING WELL LOCATION
FORMER HEATING OIL AST LOCATION
Monitoring Well Location Map
2307 Clawson Street
Winston-Salem, North Carolina
APPROXIMATE EXTENT OF EXCAVATION
Clawson St.
LEGEND
UNDERGROUND, PHONE, POWER, AND CABLE LINES
FENCE
MW-1
MW-1
Remarks:
Total Depth: 30'
Project Manager: J. Ballsieper
Casing Diameter: 2.00 (I.D.)
Hole Diameter: 6.25"
TELEPHONE: [phone]
P.O. BOX 5884
WINSTON-SALEM, NC 27113-5884
Start Date: 7/2/15
Date: July 2015
Location: Winston-Salem, NC
Project: 2307 Clawson Street Job No.: 1015005.002
Boring/Well ID:
Geologist:
60
50
40
30
Drilling Method: Geoprobe w/SSA
20
10
Sample
ID
Complete Date: 7/2/15
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Page 1 of 1
30
40
20
10
Well Diagram
MW-1
60
50
Boring Terminated @ 30 feet bls
Ground
Surface
(10') Schedule
40 PVC
(20') 0.010"
Slotted PVC
(2.0') Bent.
(22.0') #2
Sand
(6.0') Grout
Brown gray fine sandy
silt with slight odors
Reddish brown fine sandy
silt with petroleum odors