HomeMy Public PortalAbout20120823Exhibits (2).pdfTerracon Consultants, Inc. 2201 Rowland Avenue Savannah, Georgia 31404
P (912) 629 4000 F (912) 629 4001 terracon.com/savannah
July 26, 2012
Georgia Environmental Protection Division
Underground Storage Tank Management Program
4244 International Parkway, Suite 4
Atlanta, Georgia 30354
Attn: Mr. Kelly B. Adams
P: (404) 362 2597
E: kelly.adams@dnr.state.ga.us
Re: No Further Action Confirmation Request
Van Horn Property
76 Van Horn Street
Tybee Island, Chatham County, Georgia
EPD Facility ID: 4250113*1
Terracon Project No.: ES127048
Dear Mr. Adams:
Terracon Consultants, Inc. (Terracon) is submitting this letter and supporting documentation on
behalf of the City of Tybee Island, Georgia in reference to the Van Horn Site (EPD Facility ID
No. 4250113*1). The purpose of this letter is to request confirmation that the current No Further
Action Status is still applicable given the results of recent groundwater and soil sampling at the
site. Our recent groundwater and soil sampling was completed as part of a pre-development
Limited Site Investigation (LSI) of the site for a new Tybee Island Police Department building.
SITE SUMMARY 1.0
The subject site is located at what is now known as 78 and 80 Van Horne Street, Tybee Island,
Chatham County, Georgia. The subject site consists of a city owned parking lot and four (4)
permanent buildings. The Tybee Island Police Department (78 Van Horne Street) occupies a
two-story building built in the early 1930’s along with a single story building adjacent to the main
building. There is also a U-shaped, single story building (80 Van Horne Street) that is currently
being used to store and repair parking meters, known as the Ceramic building.
The site location is depicted on Figure 1 in Appendix A. A Site Plan showing the property
configuration and location of soil and groundwater locations from the HGBD Environmental CAP
Part A (1998) and the Terracon LSI (2012) field work is included as Figure 2 of Appendix A.
No Further Action Confirmation Request
Van Horn Property - Facility ID: 4250113*1 Tybee Island, Chatham County, Georgia
July 26, 2012 Terracon Project No. ES127048
Responsive Resourceful Reliable 2
PREVIOUS ENVIRONMENTAL WORK 2.0
Two (2) abandoned underground storage tanks were identified at the site in October 1997
during utilities work at the site. After the tanks were closed, a UST Closure Report was
submitted to EPD on November 13, 1997, prepared by HGBD Environmental, Inc. Groundwater
sampling completed as part of the UST closure indicated an elevated Benzene concentration
above the Maximum Contaminant Level. A Corrective Action Plan – Part A was prepared for
the site and submitted to EPD in June 1998. Three (3) soil borings were installed in vicinity of
the former tank pit area and converted to permanent monitoring wells. BTEX, PAHs, and TPH
were not detected in any of the soil samples. The groundwater sample collected from CAP Part
A well MW-2 showed detectable levels of Toluene, Ethylbenzene, and Xylenes. However, the
levels were below both the USEPA MCL and the Georgia In-Stream water quality standards. A
composite map showing the CAP-A sampling locations and the recent LSI sampling locations is
included as Figure 2.
RECENT ENVIRONMENTAL WORK 3.0
3.1 Limited Site Investigation
A Limited Site Investigation (LSI) was conducted at the site for planned new Tybee Island Police
Department building. Three (3) soil borings were advanced in the vicinity of existing USTs,
existing dispensers, and CAP Part A monitoring well MW-2 (Figure 2) in order to determine the
horizontal impact to the subsurface from the historical and existing USTs.
The laboratory results indicate the presence of volatile organic compounds and semi-volatile
organic compounds in the soils and groundwater at the subject site. The detected compounds
are less than the Georgia EPD USTMP Table B Soil Threshold Levels (< 500 feet to surface
water body). The groundwater analytical results indicate that all detected compounds were less
than the Georgia In-Stream Water Quality standards in TW-2 and TW-3. Toluene,
ethylbenzene, and Xylene (total) were detected at concentrations above the Georgia In-Stream
Water Quality standards in TW-1, which was located in the general vicinity of CAP Part A well
MW-2. Benzene was not detected in any of the soil or groundwater samples collected as part of
the LSI, which is consistent with the CAP Part A analytical results. The soil and groundwater
analytical data is summarized in Table 1 and Table 2 presented in Appendix B. Terracon’s LSI
report, including the executed chain-of-custody form and laboratory data sheets, is included as
Appendix C.
No known leaks and/or loses from the existing UST system are recorded based conversations
with the City of Tybee Island personnel familiar with the fueling operations at the site (i.e., Police
Chief Robert Bryson).
No Further Action Confirmation Request
Van Horn Property - Facility ID: 4250113*1 Tybee Island, Chatham County, Georgia
July 26, 2012 Terracon Project No. ES127048
Responsive Resourceful Reliable 3
3.2 Water Resources Survey
Terracon completed a water resources survey to identify public and private wells within
applicable radii of the site. Field reconnaissance did not indicate the presence of any private
water supply wells within 0.5 mile of the site.
The City of Tybee Island operates three (3) supply wells completed within the Floridan Aquifer
within two (2) miles of the site. Hydrogeologic units in Chatham County, Georgia, include in
descending order, the surficial aquifer system, consisting of the water-table zone, upper
confined zone, and lower confined zone (Clarke, 2003); the Brunswick aquifer system,
consisting of the upper Brunswick and lower Brunswick aquifers (Clarke and others, 1990); and
the Upper Floridan aquifer (Miller, 1986; Clarke and others, 1990). In the vicinity of the subject
site, the surficial aquifer system is generally present from land surface to 60 ft below land
surface (bls). The surficial aquifer system is typically informally divided into a water-table zone,
an upper confined zone, and a lower confined zone (Clarke, 2003). These water-bearing zones
are separated by clay confining units. The confining unit underlying the surficial aquifer is
represented by the A-marker horizon, which is present just above the Miocene upper confining
unit (Clarke and others, 1990). The upper confining unit of Miocene age in the vicinity of the
subject site extends from 60 to 140 ft bls. The Lower Brunswick aquifer is identified by Williams
and Gill (2010) to be present in the vicinity of the subject site from 140 to 160 ft bls. The City of
Tybee public supply wells are completed to produce water from the Upper Floridan aquifer. The
top of the Upper Floridan aquifer at approximately 160 ft bls in the vicinity of the subject site.
(Clarke and others, 1990; Williams and Gill, 2010). The City of Tybee wells range in depth from
402 ft to 602 ft bls.
The location of the water supply wells and the subject site are presented in Figure 3. Mr.
George Reese, City of Tybee Island Water and Sewer Department Director, was contacted
concerning any impacts to any drinking water supplies from the subject site. Mr. Reese
confirmed that there have been no known impacts to the water supply wells in the area and
provided analytical data collected from Well No. 3 in 2011 indicating no detectable
concentrations of volatile organic compounds.
3.3 Site Ranking
The Site Sensitivity Score for the site using the soil and groundwater data collected in 2012 is
500. Terracon did not score any public wells as they are not hydraulically connected to the
shallow surficial aquifer. All drinking water wells within a two mile radius of the subject property
are cased at depths that exceed 150 feet below ground surface.
APPENDIX A: FIGURES
SI
T
E
V
I
C
I
N
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T
Y
M
A
P
TY
B
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Ge
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t
y
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4
2
5
0
1
1
3
*
1
78
a
n
d
9
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b
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Pr
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Sc
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:
Fi
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Da
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:
Figure
ES
1
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4
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:
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a
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(
9
1
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)
6
2
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4
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0
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F
A
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.
(
9
1
2
)
6
2
9
4
0
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1
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a
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k
1
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d
T
a
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k
2
TW
-
1
TW
-
3
TW
-
2
MW
-
2
/
B
-
2
MW
-
1
/
B
-
1
MW
-
3
/
B
-
3
TAN
K
# 1
T
A
N
K
#
2
T
A
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K
#
4
T
A
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#
3
FO
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W
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N
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.
2
TW
-
3
MW
-
1
/
B
-
1
Dr
a
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B
y
:
Ch
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c
k
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B
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:
Ap
p
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B
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:
Pr
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M
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:
Fi
l
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N
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.
Da
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:
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:
22
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1
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6
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4
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:
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6
2
9
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4
0
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0
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2
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1
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=
3
0
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1
2
7
0
4
8
WS
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WS
A
SDSD
TY
B
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1
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=
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3
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1
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APPENDIX B: TABLES
De
t
e
c
t
e
d
A
n
a
l
y
t
e
TW
-
1
#
6
8'
b
g
s
(m g/
k
g
)
TW
-
2
#
5
8'
b
g
s
(m
g
/
k
g
)
TW
-
3
#
5
8'
b
g
s
(m
g
/
k
g
)
Re
g
u
l
a
t
o
r
y
L
i
m
i
t
(
m
g
/
k
g
)
A
Be
n
z
e
n
e
BR
L
B
R
L
B
R
L
0
.
0
1
7
To
l
u
e
n
e
32
.
5
B
R
L
4
.
8
9
1
1
5
.
0
0
Et
h
y
l
b
e
n
z
e
n
e
33
.
0
8
.
4
9
1
6
.
5
1
8
.
0
0
Xy
l
e
n
e
(
T
o
t
a
l
)
28
7
4
4
.
8
2
1
1
7
0
0
.
0
0
Na
p
h
t
h
a
l
e
n
e
6.
5
1
4
.
5
7
1
0
.
6
N
/
A
2-
M
e
t
h
y
l
n
a
p
t
h
a
l
e
n
e
14
1
0
.
6
2
2
.
1
N
/
A
1-
M
e
t
h
y
l
n
a
p
t
h
a
l
e
n
e
8.
5
7
6
.
4
4
1
6
.
1
N
/
A
TO
T
A
L
P
A
H
s
22
.
5
7
2
1
.
6
1
4
8
.
8
N
/
A
BR
L
-
B
e
l
o
w
R
e
p
o
r
t
i
n
g
L
i
m
i
t
s
A
-
Re
g
u
l
a
t
o
r
y
L
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m
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t
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d
L
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v
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l
s
(
<
5
0
0
f
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t
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t
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p
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)
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L
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t
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r
r
a
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P
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c
t
N
o
.
E
S
1
2
7
0
4
8
TA
B
L
E
1
:
S
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D
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M
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f
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r
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t
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H
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t
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t
Ty
b
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n
d
,
G
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g
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a
De
t
e
c
t
e
d
A
n
a
l
y
t
e
TW
-
1
(µ
g
/
L
)
TW
-
2
(µ
g
/
L
)
TW
-
3
(µ
g
/
L
)
In
-
S
t
r
e
a
m
W
a
t
e
r
Q
u
a
l
i
t
y
L
i
m
i
t
(µg/L)A
Be
n
z
e
n
e
BR
L
B
R
L
B
R
L
5
1
To
l
u
e
n
e
10
,
6
0
0
1,
1
3
0
3
7
8
5
,
9
8
0
Et
h
y
l
b
e
n
z
e
n
e
2,
5
3
0
1,
5
9
0
1
,
2
3
0
2
,
1
0
0
Xy
l
e
n
e
(
T
o
t
a
l
)
15
,
6
0
0
7,
0
9
0
8
,
8
0
0
N
/
A
Na
p
h
t
h
a
l
e
n
e
84
9
5
8
5
8
6
2
N
/
A
2-
M
e
t
h
y
l
n
a
p
t
h
a
l
e
n
e
44
9
3
0
7
5
6
6
N
/
A
1-
M
e
t
h
y
l
n
a
p
t
h
a
l
e
n
e
24
8
1
7
6
3
4
4
N
/
A
TO
T
A
L
P
A
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s
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