MO-3870_10780_CA_LSA_19931021_SSE

fiftAP%vi Professional Service Industries, Inc.
Environmental Management Group
October 21, 1993 ENV r ttv C. bar r or
Project No. 511-24052 a ref n;.AT,q'/f
_ rs
TO: North Carolina Department of Environment, OCT 2 5 1993
Health and Natural Resources
Mooresville Regional Office O1Vi I• t r , ;, ,
919 North Main Street, P.O. Box 950 M1l��la,;;Lhf: REf1G11AL OFFICE MEM
Mooresville, North Carolina 28115
Attention: Mr. Mike Tynan
SUBJECT: Investigation for Soil and Groundwater Clean -Up, Police Aviation Hangar,
5825 Airport Drive, Charlotte, North Carolina
Dear Mr. Tynan:
This letter is intended to confirm the September 2, 1993 telephone conversation between yourself and
Mr. Dan Huff of Professional Service Industries, Inc. (PSI) Environmental Management Group. In
accordance with our conversation and on behalf of the City of Charlotte, the Comprehensive Site
Assessment (CSA) report for the subject site (received by your office on July 30, 1993), will be used
in lieu of the "Site Investigation for Soil and Groundwater Clean -Up". The CSA Report explains the
investigation for determining the vertical and horizontal extent of soil contamination at the subject site,
as well as, the results of the investigation for the CSA.
The CSA Report and the attached Site Sensitivity Evaluation prepared for the subject site are intended
to meet the requirements outlined in the "Notice of Regulatory Requirements" letter dated August 23,
1993 for the subject site.
If you have any questions, please call the undersigned at [phone].
Sincerely,
PROFESSIONAL SERVICE INDUSTRIES, INC.
aalAuff
Staff Engineer
DNH/HSJ:tmm
coc3\aviation\report.sse
cc: Mr. Eric P. Sanderson, City of Charlotte
Mr. Jules B. Cohen, PSI -Lawrence
H. Stanton Johns on, Jr.
Project Engineer
2825 Breckinridge Blvd., Suite 120 0 Duluth, GA 30136 0 Phone: [phone] • Fax: [phone]

Professional Service Industries, Inc.
Environmental Management Group l� n, T
�NViR=_n. Ui%
October 21, 1993
Project No. 511-24052
TO: North Carolina Department of Environment, OCT 2 a 1993
Health and Natural Resources
Mooresville Regional Office 61 UhE4t!.L htG;u,"aI Uff1Cr 16ttP
919 North Main Street, P.O. Box 950
Mooresville, North Carolina 28115
Attention: Mr. Mike Tynan
SUBJECT: Site Sensitivity Evaluation, Police Aviation Hangar, 5825 Airport Drive,
Charlotte, North Carolina
Dear Mr. Tynan:
On behalf of the City of Charlotte, Professional Service Industries, Inc. (PSI) Environmental
Management Group has prepared a Site Sensitivity Evaluation (SSE) for the subject site. Enclosed,
please find one copy of the SSE Report for the above referenced facility. If you have any questions,
please contact the undersigned at [phone].
Sincerely,
PROFESSIONAL SERVICE INDUSTRIES, INC.
EaeTAuff
Staff Engineer
DNH/HSJ: tmm
coc3\aviation\report.sse
H. t� n Johnston, Jr. +
Project Engineer
cc: Mr. Eric P. Sanderson, City of Charlotte
Ms. Lisa Corbitt, Mecklenburg County Department of Environmental Protection
Mr. Jules B. Cohen, PSI -Lawrence
2825 Breckinridge Blvd., Suite 120 0 Duluth, GA 30136 0 Phone: [phone] Fax: [phone]

SITE SENSITIVITY EVALUATION
AVIATION HANGAR
5825 AIRPORT DRIVE
CHARLOTTE, NORTH CAROLINA
PREPARED FOR:
CITY OF CHARLOTTE
AVIATION DEPARTMENT
PREPARED BY:
PROFESSIONAL SERVICE INDUSTRIES, INC.
ENVIRONMENTAL MANAGEMENT GROUP
PSI PROJECT NUMBER 511-24052
OCTOBER, 1993
E

TABLE OF CONTENTS
1.0 INTRODUCTION....................................1
2.0 SITE HISTORY....................................2
3.0 SITE SENSITIVITY EVALUATION ....................... 3
3.1 Site Category Determination ........................ 3
3.2 Site Characterization Evaluation ..................... 3
3.2.1 Grain Size ............................... 3
3.2.2 Soil Structures ............................. 3
3.2.3 Distance From Deepest Concentration to Seasonal High Water
Table..................................4
3.2.4 Location of Water Table Relative to Bedrock .......... 4
3.2.5 Artificial Conduits ........................... 4
4.0 CLEAN-UP LEVELS ................................. 5
5.0 SOILS TO BE REMEDIATED ........................... 6
APPENDICES
r� ai
A�.�.

-1-
1.0 INTRODUCTION
Professional Service Industries, Inc. (PSI) Environmental Management Group is under contract
with the City of Charlotte (City) to provide environmental consulting services for the City's
underground storage tank (UST) management program. In response to the August 23, 1993
Notice of Regulatory Requirements letter from North Carolina Department of Environment,
Health and Natural Resources (NCDEHNR), PSI has prepared the following Site Sensitivity
Evaluation (SSE) for the Aviation Hangar (subject site).
PSI has conducted a Comprehensive Site Assessment (CSA) for the subject site which was
submitted by PSI and received by NCDEHNR on July 30, 1993. Applicable sections from the
CSA report, which are pertinent to the SSE, will be summarized in the following paragraphs.
The NCDEHNR "Groundwater Section Guidelines for the Investigation of Soils and
Groundwater", dated March, 1993 (referred to hereafter as "Guidelines") were used as a
guideline for preparing the SSE.
Mv'

-2-
2.0 SITE HISTORY
A Comprehensive Site Assessment (CSA) report was prepared by PSI (dated July 27, 1993) for
the subject site. A total of eighteen soil borings and four monitoring wells were installed at the
subject site. Laboratory analysis of soil samples from four of the soil borings, near the
southwest end of the UST, indicated the presence of Total Petroleum Hydrocarbons (TPH) at
j concentrations ranging from 38.5 milligrams per kilogram (mg/kg) and 828 mg/kg. Laboratory
analysis of soil samples from the remaining fourteen soil borings indicated TPH concentrations
less than 10 mg/kg. Based on these results, the soil contamination existing at the subject site
appears to be limited to the area nearest the southwest end of the on -site UST. Laboratory
analysis of groundwater samples obtained from the four monitoring wells on -site, indicated
concentrations of volatile and semi -volatile organics which were below detection limits.
115

City of Charlotte, Aviation Hangar -3-
Site Sensitivity Evaluation
PSI Project Number 511-24052
3.0 SITE SENSITIVITY EVALUATION
3.1 Site Category Determination
A water well survey, conducted for the CSA report for the subject site, did not identify the
location of a water supply well within 1,500 feet of the subject site. In addition, the subject site
and properties in the immediate vicinity are served by an accessible public water supply. In
accordance with this information and Table 3 "SSE SITE CATEGORY DESCRIPTIONS" of
the NCDEHNR Guidelines (page 18), included in Appendix A, the subject site is classified as
CATEGORY E.
3.2 Site Characterization Evaluation
The Site Characteristics Evaluation Scoresheet is included from the Guidelines as Table 1 (page
16). Table 1 has been copied from the Guidelines and completed for the subject site and is
included in Appendix A. The following paragraphs detail the specific site conditions addressed
by Table 1.
3.2.1 Grain Size Determination
A total of seventeen soil borings and four monitoring wells were installed at the
subject site during the Comprehensive Site Assessment in order to delineate the
soil contamination existing at the subject site. Based on field visual and textural
classification of the soil samples obtained from these soil borings, the
predominant soil in the vicinity of the contamination source and contaminated soil
is clay. The grain size score is 0.
3.2.2 Soil Structures
Based on the soil samples obtained at the subject site, no relict structures,
sedimentary structures and/or textures were present in the zones of contamination
and underlying soils. The soil structures score is 0.

City of Charlotte, Aviation Hangar
Site Sensitivity Evaluation
PSI Project Number 511-24052
3.2.3 Distance From Deepest Contamination to Seasonal High Water Table
Four groundwater monitoring wells were installed at the subject site as part of the
Comprehensive Site Assessment. Based on measured groundwater levels and the
delineated soil contamination, the distance from the location of deepest soil
contamination to the water table is less than 5 feet. The water table score is 20.
3.2.4 Location of Water Table Relative to Bedrock
Based on soil borings installed at the subject site, the top of bedrock or
transmissive indurated sediments is not located above the water table. The
bedrock score is 0.
3.2.5 Artificial Conduits
Artificial conduits, consisting of underground product lines and power lines
(associated with the subject site UST system) are located within the zone of
contamination. These artificial conduits do not appear to be present in the zone
which intersects the water table. The artificial conduit score is 5.
IM
Based on the information summarized in Table 1, the subject site has a Total Site
Characteristics score of 25
12

City of Charlotte, Aviation Hangar
Site Sensitivity Evaluation
PSI Project Number 511-24052
4.0 CLEAN-UP LEVELS
-5-
The Total Site Characterization score for the subject site was determined to be 25. The subject
site was determined to be a Category E site. Using Table 2 from the Guidelines, the following
clean-up levels were determined:
TABLE A
EPA Method
Initial Clean-up Level
Final Clean-up Level
PPm
Ppm
8015/5030
100
300
8015/3550
400
1,200
A copy of completed Table 2 completed is included in Appendix A.

City of Charlotte, Aviation Hangar -6-
Site Sensitivity Evaluation
PSI Project Number 511-24052
I
5.0 SOILS TO BE REMEDIATED
Based on the final clean-up levels established in the SSE, the soils investigated to this point at
the subject site do not require remediation, as these soils consist of Total Petroleum
Hydrocarbons (TPH) concentrations which are below the final clean-up levels noted in Table A
above.
The laboratory analytical results for the soil samples obtained at the subject site are included
below in Table B. A site map with boring locations (Figure 3 from the CSA Report) is included
in Appendix B.
TABLE B
Soil Analytical Results
Constituent
Sample Identification
TPH Extractablesa
TPH Purgeable°
Sample Interval (ft bls)
mg/kg
ug/kg
SB-01
828
NA°
5.0 - 6.5
SB-02
5.0 - 6.0
770
NA
SB-03
5.0 - 6.5
BDL`
NA
SB-04
BDL
NA
10.0 - 11.5
SB-05
BDL
NA
10.0 - 11.5
SB-06
BDL
BDL
3.0 - 3.5
SB-07
BDL
BDL
1.0 - 2.0
SB-08/MW-04
BDL
132
3.0 - 5.0
�V%

City of Charlotte, Aviation Hangar
Site Sensitivity Evaluation
PSI Project Number 511-24052
TABLE B (cont.)
Soil Analytical Results
-7-
Constituent
Sample Identification
TPH Extractablesa
TPH Purgeable"
Sample Interval (ft his)
mg/kg
ug/kg
SB-09
7.0 - 9.0
BDL
BDL
SB-1
3.0 - 5.0
BDL
BDL
SB-11
5.0 - 5.5
96.4
274
SB-12
7.0 - 9.0
38.5
BDL
SB-
7.0 -9.0
BDL
7,300
SB-
3.0 -5.0
BDL
BDL
SB-
3.0 -4.0
BDL
BDL
SB-
1.0 - 3.0
BDL
BDL
SB-
3.0 -5.0
BDL
BDL
SB-18
9.0 - 11.0
BDL
BDL
a. TPH Extractables by Method 8015/3550 with a detection limit of 3 milligrams per
kilogram (mg/kg).
b. TPH Purgeable by Method 8015/5030 with a detection limit of 100 micrograms per
kilogram (ug/kg).
C. BDL = Below Detection Limits
d. NA = Not Analyzed
Mom'

APPENDICES
MR'

APPENDIX A
SITE SENSITIVITY EVALUATION TABLES
(taken from NCDEHNR Guidelines)
Mom'

Site Sensitivity Evaluation (SSE)
Site Characteristics Evaluation (Step 1)
CharacteristicCondition
Rating
Grain Size*
Gravel
150
Sand
100
Silt
50
Clay
0
0
Are relict structures.
Present and intersecting the
10
sedimentary structures,
water table.
and/or textures present
in the zone o
intersecting
Present but not t
— g
5
contamination
the water table.
and underlying "soils"?
None present.
0
0
0 -5 feet
20
Distance from location of
(C, D & E sites only)
deepest contaminated
5 - 10 feet
20
soil** to water table.
>10 40 feet
10
0
> 40 feet
20
Is the top of bedrock or
Yes
20
transmissive indurated
NO
0
sediments located above
the water table?
0 ,
Artificial conduits present
Present and intersecting
10
within the zone of
the water table.
contamination.
Present but not intersect-
5
ing the water table.
"
Not present.
0
5
Total Site Characteristics Score:
25
* Predominant grain size based
on Unified Soil Classification System or U.S. Dept.
of Agriculture's
Soil Classification Method.
** (> 10 ppm TPFH by Method
5030; >40 ppm TPFH by Method 3550; >250 ppm O&G
by Method
9071)
3/10193 16
Completed for the City of Charlotte Aviation Hangar
(PSI REPORT NO.
511-24052).

Site Sensitivity Evaluation (SSE)
Initial Cleanup Level Final Cleanup Level
(Step 2) (Step 3)
;sucn as; tsasotlne, LiV1dL1UI1 r uC1J, l7YtJU11V1I
Final
Cleanup
Total Site
Initial Cleanup
Category A & B
Level
Characteristics
Level TPFH (ppm)
(Multiply Initial 1 x _—
_ - ppm
Score
cleanup level by 1)
>150
<-10
Select
Category C & D
(Multiply initial 2 x _
= ppm
121-150
20
Site
cleanup level by 2)
91-120
40
Category'
61-90
60
Category E
31-6.0
80
(Multiply initial 3 x 100
=300 ppm
0-30
100
cleanup level by 3)
t
EPA Nietho 3 N for
I
High Bollug Point Hydrocarbons
as Kerosene, Diesel, VarsoI, Il3ineral Spints,Naphtha.
such
Final
Cleanup
Total Site
Initial Cleanup
Level
Characteristics
Level TPFH (ppm)
Category A & B
Score
(Multiply initial 1 x _
= ppm
cleanup level by 1)
>150
<-40
Select
Category C & D
121-150
80
Site
(Multiply initial 2 x —
= Porn
•
91-120
160
Category'
cleanup level by 2)
61-90
31-60
240
320
Category E
(Multiply initial 3 x 4�
=_12QQ_ ppm
0-30
400
cleanup level by 3)
EPA 1YIethod 9071 for
Heavy Fuels Oil & Gre`ase (O&Gj
such as Fuel Oil t4, #5, #6,'Motor 011,,Iigdraulic Flmd'
Final
Cleanup
Total Site
Initial Cleanup
Category A & B
Level
Characteristics
Level O&G (ppm) al 1 x
lby
- m
PP
Score
cleanup level 1)
>150
<-250
Select
Category C & D
121-150
400
Site
(Multiply initial 2 x
= PPm
91-120
550
Category'
cleanup level by 2)
61-90
700
Category E
31-60
850
(Multiply initial 3 x NA
= NA ppm
0-30
1000
cleanup level by 31
' See Site Category Descriptions, Table 3
17
3/10/93
Completed
for the City of Charlotte Aviation Hangar '(PSI PROJECT NO. 511-24052).

TABLE 3
SSE SITE CATEGORY DESCRIPTIONS
CATEGORY A (Site meets any one of the criteria)
I. Water supply well(s) contaminated and not served by accessible public water supply.
2. Vapors present in confined areas at explosive or health concern levels.
3. Treated surface water supply in violation of the safe drinking water standards.
CATEGORY B (Site meets any one of the criteria)
I. Water supply well(s) contaminated, but served by accessible public water supply.
2. Water supply well(s) within 1500 feet of site, but not contaminated and not served by
accessible public water supply.
3. Vapors present in confined areas but not at explosive or health concern levels.
CATEGORY C (Site meets both of the criteria)
1. No known water supply well(s) contaminated.
2. Water supply well(s) greater than 1500 feet from site but not served by accessible
public water supply.
CATEGORY D (Site meets both of the criteria)'
1. No known water supply well(s) contaminated.
2. Water supply well(s) within 1500 feet of site but served by accessible public water
supply.
CATEGORY E (Site meets both of the criteria)
1. No known water supply well(s) contaminated or within 1500 feet of site.
2. Area served by accessible public water supply.
r 3/10/93 18

APPENDIX B
SITE MAP

Z
w
w
P
U
W
-
m
<
N
N
ooX
m
a
N
N
m
m
m
NI
m
I
_
N
�
N
Z_
J
O
WU"
O
Wow
<J
9 O
�N<
Lim
J
<IDU
Z
pJ
O-
F
U
W