Harrington ST_ENV TEST RESULTS FOR 413

February 11, 2015

Mr. Gregg Sandreuter Harrington Street Partners, LLC 104 Lake Cliff Court
Cary, NC 27513

Reference: LETTER REPORT OF ENVIRONMENTAL TEST RESULTS
FORMER WEST SALES CENTER
413 NORTH HARRINGTON STREET
RALEIGH, NORTH CAROLINA
MID-ATLANTIC PROJECT NUMBER: 000R2644.00 TASK 10000

Dear Mr. Sandreuter:

In response to your authorization of Proposal No.P15R-7098, dated January 17, 2015, Mid-Atlantic
Associates, Inc. (Mid-Atlantic) is pleased to present this Letter Report of Environmental Test
Results. As outlined in the proposal, Mid-Atlantic drilled two soil test borings to collect soil samples
for visual classification, headspace screening and installation of temporary groundwater monitoring
wells. The purpose of the drilling and sampling program was to identify the presence or absence of
petroleum-related contamination under the site from leaking underground storage tank (LUST) sites
on adjacent properties. These LUST sites include a “closed” incident on the former David Allen
Company, Inc. (DAC) property located at 309 North Harrington Street and an active LUST incident
at the Wake County General Services Administration (GSA) complex located on the southeastern
adjacent property (401 Capital Boulevard). Temporary monitoring wells TMW-1 and TMW-2,
respectively, were installed at locations presumed hydraulically downgradient of the two LUST
incidents. The soil borings and temporary monitoring wells were installed by a North Carolina Certified Well Driller (CWD) employed by Parratt Wolff, Inc. on January 19, 2015, under supervision
of Mr. Sean Gallagher of Mid-Atlantic. Copies of the soil boring logs are included in Appendix 1. During drilling of the soil borings, we did not detect elevated headspace readings with the Toxic
Vapor Analyzer (TVA) used to screen the samples1 from TMW-1. At a depth of 14 feet below land surface (bls) at TMW-2 (approximate depth of groundwater), the TVA indicated a reading of 35.7
ppm and we noted a mild petroleum odor in the soils. Auger refusal (presumed bedrock) was
encountered at 9 feet bls at TMW-1 and 21 feet bls at TMW-2. The borings were drilled by air
hammer from 9 to 15 feet bls at TMW-1 and 21 to 25 feet bls at TMW-2 in order to reach the
desired boring depths. The two temporary monitoring wells were installed with two inch diameter
polyvinyl chloride (PVC) well screen with intervals positioned to bracket the water table. Well TMW-
1 was screened from 5 to 15 feet bls while TMW-2 was screened from 15 to 25 feet bls. A sand
1 The TVA was equipped with a Flame Ionization Detector

Letter Report of Environmental Test Results February 11, 2015
Former West Sales Center Page 2
Raleigh, North Carolina

pack was installed around the well screen followed by bentonite clay pellets and a neat cement
grout to seal off the screened zone from the surface. After installation, the wells were developed to
remove turbid groundwater and silt/clay particles suspended in the water column. The location of
each temporary well is shown on Drawing 1.
One day after development, the water levels in the temporary wells were gauged at 9.50 feet bls at well TMW-1 and 13.96 feet bls at well TMW-2. Three well volumes of water were then purged from
the wells and groundwater samples were collected on January 20, 2015 by Mid-Atlantic. The
samples were placed in containers provided by the laboratory, immediately placed on ice, and
shipped by courier to Prism Laboratories, Inc. in Charlotte, North Carolina (Prism). The samples
were tested for constituents of concern (COCs) including volatile organic compounds (VOCs) by
standard method 8260B; semi-VOCs by EPA Method 8270D; and volatile petroleum hydrocarbons
(VPH) and extractable petroleum hydrocarbons (EPH) by methods developed by the
Massachussetts Department of Environmental Protection (MADEP). Compounds detected in the
groundwater samples are shown on Table 1 and the laboratory report is included in Appendix 2.
One VOC constituent, benzene, and C5 to C8 aliphatic compounds were detected in the sample
collected from TMW-2 in concentrations that exceeded North Carolina Groundwater Quality
Standards (NCGQS). Several other constituents were detected, but at concentrations below the
NCGQS. Both benzene and C5 to C8 aliphatic compounds are typically present in more volatile
grades of petroleum including gasoline.

On January 20, 2015, after sampling was completed, the two temporary monitoring wells were
abandoned at the site by Mr. Sean Gallagher. Mr. Gallagher completed this work under the
direction of Mr. Gary Fischer, a North Carolina CWD and employee of Mid-Atlantic. Mr. Gallagher
first attempted to remove the top section of PVC well casing; however, the bentonite clay and grout
sealing material installed around the well casing prevented its removal. He then filled the casing
with grout through a tremie pipe. At the surface, concrete was used to patch the hole at TMW-1
while soil was used to return the hole at TMW-2 to grade. The latter well was installed in a grassed
area near the parking garage.
Conclusions and Recommendations Laboratory analytical reports and field observations did not indicate the presence of petroleum in
soil or groundwater at the location of TMW-1. As such, it does not appear that the release at the
Wake County GSA complex has adversely-impacted the subject site. However, laboratory
analytical reports and field observations did indicate the presence of weathered petroleum
compounds in the groundwater at temporary well location TMW-2. Mid-Atlantic did not observe
evidence of petroleum-contaminated soils present above the water table at either boring location.
Although the laboratory results document the presence of petroleum constituents at concentrations
exceeding the NCGQS in groundwater at TMW-2, these concentrations are below the North
Carolina Department of Environment, Health and Natural Resources, Division of Waste
Management, Residential and Non-Residential Vapor Intrusion Screening Levels for groundwater.

In August of 2004, environmental assessment work was completed by SITECH Consulting, P.C. on
the southern adjacent property located between DAC LUST site and the subject site. SITECH
identified limited groundwater contamination below the south adjacent property and inferred that the

Letter Report of Environmental Test Results February 11, 2015
Former West Sales Center Page 3
Raleigh, North Carolina

groundwater contamination was likely associated with a groundwater plume from the DAC site.
SITECH did not identify soil contamination in the soils from the areas sampled above regulatory
levels (SITECH, 20042). The subject site is located approximately 150 feet north and hydraulically downgradient of the SITECH borings advanced in 2004. Based on this information and the information collected during this investigation, the documented release(s) at the nearby DAC site
appears to be the source of petroleum compounds detected at TMW-2.The DAC LUST incident
was closed by DENR in October 2004 after the landowner filed a Notice of Residual Petroleum
(NORP) with the Wake County Register of Deeds Office that restricts groundwater for use as a
water-supply and residential use in the area of known contamination on the DAC property.

The petroleum-impacted material at the site appears to be localized near the southwest portion of
the subject site and limited to groundwater and soils at and beneath the groundwater table
elevation. Mid-Atlantic does not consider the petroleum contamination detected during this
investigation to be an impediment to site redevelopment. However, redevelopment that includes
excavation or displacement (i.e. foundation work) of soils from below the water table or groundwater
should include measures to ensure construction workers are properly protected from exposure to
petroleum-impacted material and that the material is properly handled/disposed.

Mid-Atlantic appreciates the opportunity to submit this report to Harrington Street Partners, LLC. We
also recommend that a copy of this report be submitted to the Underground Storage Tank Section
of the Division of Waste Management for their review. If you have questions or require additional
information, please contact us at your convenience at 250-9918.

Sincerely,
MID-ATLANTIC ASSOCIATES, INC.
Eric Aufderhaar, PG Darin M. McClure, PE.
Senior Geologist President/Principal Engineer

Attachments:

Drawing 1 – Temporary Well Locations
Table 1 – Summary of Groundwater Sample Laboratory Results
Appendix 1 – Soil Boring Logs with Well Construction Information
Appendix 2 – Laboratory Report

2 SITECH, 2004, Limited Phase II Soil and Groundwater Assessment, Electromagnetic Survey and
Ground Penetrating Radar Assessment Real Property located at 401 and 413 North Harrington
Street - State Employees Association of NC, Inc., SITECH Consulting, Inc., Raleigh, North Carolina.

DRAWING

!A
!A
!A
!(
!(!(
!(
!?
!?
TMW-2
TMW-1
´
TEMPORARY WELL
LOCATION MAP413 NORTH HARRINGTON STREET
RALEIGH, NORTH CAROLINA
DRAWN BY:
DATE:
ENG. CHECK:
JOB NO:
APPROVAL:
DRAFTCHECK:
GIS NO:
DWG NO: 1
REFERENCES:SCALE:
FEBRUARY 2015
R2644.00 T10000
01G-R2644.00-4
1. 2010 AERIAL IMAGERY, PARCEL BOUNDARYAND ROAD DATA FROM WAKE COUNTY GIS.2. MID-ATLANTIC FIELD NOTES.
1:960
0 80 160
Feet
!?TEMPORARY MONITORING WELL
!(CONTAMINATED SOIL NOTED DURING CONSTRUCTION (2007)
!(PETROLEUM ODOR NOTED IN GEOTECH BORINGS (2004)
!A OFF-SITE CONTAMINATED MONITORING WELL
SUBJECT SITE
PARCEL BOUNDARY
401 CAPITAL BOULEVARD
LEAKING UST
INCIDENT(GAS/DIESEL)
309 N. HARRINGTON STREET(CLOSED, FORMER DAVID ALLEN
LEAKING UST INCIDENT)

TABLE

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T
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APPENDIX 1
SOIL BORING LOGS WITH
WELL CONSTRUCTION INFORMATION

ft
-
B
L
S
Odors
FI
D

(
p
p
m
)

Re
c
o
v
e
r
y

(f
t
.
)Comments
NOTES:
COMMENTS:
in - indicates inches N/A - indicates not applicable to this boring
ft - indicates depth in feet ppm - indicates parts per million
ft BLS - indicates feet below land surface NR - not recorded
● Hollow stem auger from 0.0 to 9.0 feet
● Air hammer from 9.0 to 15.0 feet
NA
0.38
Bedrock (tan/grey cuttings)None
15
5 0.09 FID Reading at 5'
NA
9
10
0.05 FID Reading at 9'
FID Reading at 11'
None
ft
-
B
L
S
NA
9
SOIL DESCRIPTION (color, texture, moisture, etc.)
Red/brown silty clay 5
NA
15
11
S. Gallagher
Date Started:1/19/2015 Driller :Paratt-Wolff Longitude:NA
Date Completed:1/19/2015 Monitoring Equipment:TVA / FID Geologist/Engineer:
NA
Project Number:R2639.00 Sampling Method:Auger flights Well Screen Depth (ft):5 to 15
Location: Raleigh, NC Subcontractor/Drillers: Paratt-Wolff Latitude:
1 of 1
Site Name: 413 N. Harrington St.Drilling/Boring Method:
Geoprobe
(Hollow stem auger and air
hammer)Total Boring Depth (ft):15
409 Rogers View CourtRaleigh, NC 27610Ph: 1-800-486-7568
LOG OF BORING: TMW-1
Page:
ft
-
B
L
S
Odors
FI
D

(
p
p
m
)

Re
c
o
v
e
r
y

(f
t
.
)Comments
NOTES:
COMMENTS:
in - indicates inches N/A - indicates not applicable to this boring
ft - indicates depth in feet ppm - indicates parts per million
ft BLS - indicates feet below land surface NR - not recorded
NA
ft
-
B
L
S
NA Red/brown sandy silt0.00
SOIL DESCRIPTION (color, texture, moisture, etc.)
FID Reading at 21'
5
9
NA
14
2525
● Hollow stem auger from 0.0 to 21.0 feet
● Air hammer from 21.0 to 25.0 feet
NA
None
NA
FID Reading at 14'35.70
FID Reading at 24'
0.03
0.05
Tan sandy silt (wet)
Bedrock (tan/grey cuttings)
None
FID Reading at 5'
NA
0.10
None
FID Reading at 9'
NA
Location: Raleigh, NC Subcontractor/Drillers:
S. Gallagher
Date Started:1/19/2015 Driller :Paratt-Wolff Longitude:NA
Date Completed:1/19/2015 Monitoring Equipment:TVA / FID Geologist/Engineer:
Paratt-Wolff
Project Number:R2639.00 Sampling Method:Auger flights Well Screen Depth (ft):
409 Rogers View CourtRaleigh, NC 27610Ph: 1-800-486-7568
LOG OF BORING: TMW-2
Page:
NA
15 to 25
Latitude:
1 of 1
Site Name:
20
5
9
10
14
15
Petroleum odor
(weathered)Tan sandy silt (looks discolored)
413 N. Harrington St.Drilling/Boring Method:
Geoprobe
(Hollow stem auger and air
hammer)Total Boring Depth (ft):25

APPENDIX 2
LABORATORY REPORT

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