NCD095458527_20080429_FCX Inc. (Statesville)_FRBCERCLA RA_Vapor Intrusion Assessment-OCR

Date:
Owner/Resident Name:
Address:
Phone number:
Best Contact number:
Purpose of Meeting:
Communication Data Sheet
FCX-Statesville Superfund Site OU3
Time:
V
John Welch-Badger Warehouse
1735 Weinin
704-871-0990 ext 204
Discuss February 2008 Soil Gas & Groundwater Sampling Results
Documents left with owner/resident: / t // N 1 ,,J, ¾ ',,,,dour Cl;,, v-<S" I /,.
Documents shared but not left with owner/resident:
Content of Meeting:
Action Items for Follow-up:
I
Return visit? ,1eeJ. '1-v cJ" "' Li!aveh12,,,se.
Additional information to be mailed?
Other?
\\ Follow-up phone call?
_·_,l,,i,,+-''/M'--"--"/#,__'7z_0 -'['-"v-"'0:'---'---'/1,±:,:.2:s ~:::..' _,v1A-t=i::..·.L, --',\)~o..::_v---'·l.e:'l-l,::,~,'.L!..!/1,\0.1,Y"-'''--'li"-'lu:::.,· J::_:11..::.11'\..;_:+_::'.Lc.._ ___________ _
Personnel Conducting Meeting:
P:\Clients\EI Paso\EPNG FCX\134391 -FCX Win1er 2008 Vapor Sampling\001-002\Communication Data Sheels\Davis.xls 412712008
•
A elpaso
April 28, 2008
Mr. John Welch
l 35 lntcrcraft Drive
Statesville, NC 28677
RE: Badger Warehouse
1735 Wcining, Statesville, NC
•
I 00 I I ,ouisian,i St,ccl
Houston, rx 77002
713-420-3827
FCX-Statesville Superfund Site Operable Unit 3, Statesville, NC (OU3 or Site)
Dear Mr. Welch:
I am writing to follow up on the recent indoor air sampling that was performed as part of
a vapor intrusion evaluation at the Badger Warehouse at 1735 Weining, Statesville, NC.
As you are aware, Brown and Caldwell (13C), on behalf of El Paso Natural Gas Company
(EPNG) collected 6 indoor air samples on February 25-26, 2008. The locations from
which these samples were taken arc shown on the Sampling Location Map (attached).
These samples were collected because there are volatile organic compounds (VOCs) in
the groundwater under the buildings in your area, including the warehouse. The source
of the VOCs was explained in the letter EPNG sent to you on February 5, 2008.
"Volatile" means that VOCs can evaporate out of groundwater. Evaporated VOCs could
move through the soil gas into buildings above the groundwater. "Soil vapor or soil gas"
arc terms used to describe the gas or vapor contained in the soil above the groundwater.
This letter presents information on the laboratory results of the indoor air samples taken
on February 25-26, 2008, and next steps proposed by EPNG.
Results of the Indoor Air Samples
Indoor air samples from your prope1ty contained seven of the ten VOCs identified as
being present at the former Burlington Plant (now owned by EPNG) (referred to in this
letter as "site related chemicals" or "site related VOCs"). These site related chemicals
i.e. tetrachloroethene, (also called perchloroethylene or PCE), trichloroethene (also called
TCE), vinyl chloride, carbon tetrachloride, chloroform, methylene chloride, and I, l ,2-
trichloroethane were detected within the indoor air and their concentrations arc shown on
Table I. EPNG believes that the concentrations arc within the range the United States
Environmental Protection Agency (USEPA) will consider acceptable for indoor air with
Mr. Welch
April 28, 2008
Page 2 of3
• •
the exception of TeE in two sample locations (Sec Table I, BDWH-02 and BDWH-06).
These ranges arc discussed in more detail in this section.
The USEPA has established screening levels to evaluate whether concentrations ofVOes
in the indoor air arc a potential concern for people living in houses above soil gas with
voes. Table I shows the USEl'A screening level and the sample result for each site
related voes in indoor air at the six sampling points on your property.
The USEPA screening levels are based on anticipated residential exposures and arc
established within a range of concentrations that have been determined to be acceptable
based on the potential for adverse health effects over a lifetime, if one is exposed to that
concentration for 30 years. USEPA uses this range to determine if action is
recommended to reduce potential exposure to the chemicals. USEPA policy has
determined that:
• For concentrations below the lowest acceptable concentration ( called the 10·6
level), the possibility of adverse health risks is extremely low or insignificant.
• For concentrations above the highest end of the range (called the 10·'' level),
action to reduce exposure or fi.niher investigation may be warranted.
• For concentrations within the 1 o·6 to 10-4 range, action may not be warranted
depending on the level of confidence in the results e.g. a high level of
confidence allows a higher acceptable level.
The concentration of PCE, vinyl chloride, carbon tetrachloride, and methylene chloride
arc below the 10-<• level that USEPA considers acceriable. The concentrations of
chloroform and 1,1,2-trichlorocthanc are within the 10· to 10·4 range that the USEPA
may consider acceptable without further action for indoor air, even in a residential
setting. The concentrations of TeE in four of the six samples were within the I o·6 to I 0-4
range; two of the six samples had TeE greater than the 10-4 risk screening level. These
results indicate that the voes in indoor air may warrant fmthcr investigation to, among
other things, determine if there is a source of TeE inside the building --TCE is a
common degreasing solvent and one TeE result was significantly higher than the others,
indicating a possible interior building source. Two non-site related chemicals (benzene
and· 1,2,4-trimethylbenzene) were also detected at several locations; however, EPNG
believes that the observed concentrations arc within an acceptable range as defined by
USEPA's conservative risk screening values. The USEPA risk levels assume constant
exposure for 24 hours a day, seven days a week, for a period of 30 years. Since the
warehouse is not a residence, the potential actual exposure to someone working an 8-hour
shift would potentially be up to three times less than the scenario that the risk levels arc
based on.
Mr. Welch
April 28, 2008
Page 3 of]
Next Steps
• •
In technical review, the data indicate that the concentrations of TCE in indoor air should
be investigated further to determine among other things, if there is a source ofTCE inside
the building. ll is a common degreasing solvent and had only two results that were
significantly different from the others. Subject to your agreement, we would like lo lake
another round of samples from the same locations inside the warehouse. As you arc
aware, an indoor air sampling questionnaire was completed in conjunction with the
February 25, 2008 sampling event; this questionnaire should also be filled out by the
company currently leasing the space within the warehouse. We will be contacting you to
discuss the results and further investigation. In the meantime, you should be receiving
regular Fact Sheets about site remediation activities to help keep you up to date on what
is happening.
Please feel free to contact me at 713-420-3425 if you would like any additional
information about the vapor intrusion evaluation process. As you know, EPNG is
working under the direction of USEPA. If you have any questions, please contact Ken
Mallary of USE!' A al 404-562-8802 or Nile Testerman who is with the North Carolina
Department of Environment and Natural Resources (NCDENR) at 919-508-8482.
Sincerely,
~/~V\ 1 , ~<){'c✓~IJV\
Brian S. Johnson
El Paso Natural Gas Company
cc: Janet McQuaid, EPNG
Jennifer Porter, Gurne Porter, PLLC
Ken Mallary, USEPA
Nile Testerman, NCDENR
Enclosure: Map of Sampling Locations and Table I
E ro
" 0
•
LEGEND
(!_) SHALLOW WELL LOCATION
/ii (;') INTERMEDIATE WELL LOCATION
~ ® DEEP WELL LOCATION
~ □ INDOOR AIR SAMPLE LOCATION
\1 a.
i w I ~
BDWH-06
□
(D 1:::w-• · ·: -~
1::w -I:;:
BDWH-01
□
BOWH-02
□
BADGER
WAREHOUSE
□ BDWH-05
□ BDWH-04
// .. I~.~ ••, .. ··t'q,
D
100
SCALE
•
(-j) ---~-~Y-.r~'R
□ BOWH-03
·-. --
/
0 40
SAMPLE LOCATIONS FOR
BADGER WAREHOUSE
FCX-STATESVILLE SUPERFUND SITE OU3
STATESVILLE, NORTH CAROLINA
....
s
200
FEET
134391.001.002 03/08
BROWN AND
CALDWELL Nashville, Tc>nneJ;ser.
a.._ ____________________ ..... _______________ _,
Volatile Organic
Compounds a
Sam le Date
Tetrach!oroethene (PCE)
Trichloroethene {TCE)
cis• 1,2·Dichloroethene (cDCE)
inyl chloride
Carbon tetrachloride
Chloroform
1, 1-Dichloroethene
1,2•Dichloropropane
Methylene chloride
1, 1,2·Trichloroethane
Footnotes:
µg/m3
µg/m3
µgfm3
µgfm3
µgfm3
µg/m3
µg/mJ
µg/m3
µgtm 3
µg/m3
BDWH-01
Table 1
Indoor Air Results
Badger Warehouse
BDWH-01 Duplicate
(BDWH-B8)
2/25-26/2008 2/25-26/2008
0.203 J 0.271 J
0.107 J 0.215 J
0.0555 U 0.0555 U
0.0256 J 0.0255 J
0.126 J 0.126 U
0.781 0.146 U
0.0238 U 0.0238 U
0.139 U 0.139 U
0.903 0.938
0.273 0.109 U
"Site-related VOCs as listed in Table 2 of the September 2006 Explanation of Significant Diflerence (ESD) for
FCX Operable Unit 3 (OU3).
bUnits are in µg/m3 = micrograms per cubic meter
c Feel below ground surface.
<1USEPA Screening level is from the Indoor Air Concentration
in the USEPA OSWER D;aft Guidance foj Evaluating !he Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils
(Subsurface Vapor lnirusion Guidance) {2002)
e Laboratory data qualifiers are as follows:
J means the the concent,ation was dose to the reporting limit and is estimated.
The actual concentration could be slightly higher or lower.
U means that the VOC was not identified in the sample above the concen:ration reporting limit.
Table 1 Badger Indoor Air
Results for Bad er Warehouse
Indoor Air
BDWH-02 BDWH-03 BOWH.Q4
2/25•2612008 2/25-26/2008 2/25-26/2008
0.203 J 0.136 J 0.203 J
2.35 0.645 0.107 J
0.0555 U 0.0555 U 0.0555 U
0.0255 J 0.0256 J 0.0230 U
0.126 J 0.126 U 0.126 J
0.977 0.586 0.781
0.0238 U 0.0238 U 0.0238 U
0.139 U 0.139 U 0.139 U
1.25 1.35 1.42
0.655 0.109 U 0.327
BDWH-05 BDWH-06
2125-26/2008 2/25-2612008
0.203 J 0.407 J • 0 107 J 130
0.0555 U 0.0555 U
0.0256 J 0.0256 J
0.126 U 0.126 J
0.781 0.879
0.0238 U 0.0238 U
0.139U 0.139 U
1.08 1.01
0.109 J 0.218 J •
Date:
Owner/Resident Name:
Address:
Phone number:
Best Contact number:
Purpose of Meeting:
• •
Communication Data Sheet
FCX-Statesville Superfund Site OU3
Time:
---.,(" 1W f •• ; fl
Ms. MortonEne1& Pete Jones ;:;
1540 Yadkin Street & 1536 Yadkin Street
704-871-2022
Discuss February 2008 Soil Gas & Groundwater Sampling Results
Documents left with owner/resident: .,f...:t..:..,_l--'--f-"e."'s'--1,ta..o'-'lc.,Sc... '-l"O::.._•:...· .:.l.:.:S...:-,,:,3_,,G,'---------------7
Documents shared but not left with owner/resident:
Action Items for Follow-up:
Return visit?
Additional information to be mailed?
Follow-up phone call?
Other?
(.(WI), l,,c,,t-f1--~ s 11i '"""" w fYI I<;'?, 0
Person.'.'el Conducting Meeting: ---1U{!,1~fc-1il1c;e!,e .I&-I 'ls,)c,o-.1-;4"S,•1,,,
, .• ,----;::;:;1 """'"" --..... ,.
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P:\Clients\EI PnsolEPNG FCX\134391 • FCX Wm1er 2008 Vapor Sampfing\001-002\Communication Dala Sheets\Jones.xls 4/27/2008
•
•
~ elpaso
April 28, 2008
Mr. and Mrs. Pete and Darlene Jones
1536 Yadkin Street
Statesville, NC 28677
RE: 1540 Yadkin Street
!00 I 1.ouisimrn S1rcct
I louston, TX 77002
7 l J.-420-3827
FCX-Statcsville Superfund Site Operable Unit 3, Statesville, NC (OU3 or site)
Dear Mr. and Ms. Jones:
I am writing to follow up on the recent subsurface sampling that was performed as part of
a vapor intrusion evaluation at 1540 Yadkin Street. As you arc aware, Brown and
Caldwell (BC), on behalf of El Paso Natural Gas Company (EPNG), re-sampled three
soil gas sampling points on the property on February 18, 2008. Two crawl space air
samples were also collected on February 25, 2008. The locations from which these
samples were taken are shown on the Sampling Location Map (altached).
These samples were collected because there are volatile organic compounds (VOes) in
the groundwater under the houses in your area, including your house. The source of the
VOCs was explained in-the letter EPNG sent to you on May 11, 2007. "Volatile" means
that voes can evaporate out of groundwater. Evaporated voes could move through the
soil gas into buildings above the groundwater. "Soil vapor or soil gas" are terms used to
describe the gas or vapor contained in the soil above the groundwater.
This letter presents information on the laboratory results of the soil gas and groundwater
samples and next steps proposed by EPNG.
Results of the Soil Gas Samples
Soil gas samples from your property contained four of the ten voes identified as being
present at the former Burlington Plant (now owned by EPNG) (referred to in this letter as
"site related chemicals" or "site related voes"). Three site related chemicals
[tctraehloroethene, (also called perchloroethylenc or PCE), trichloroethenc (also called
TCE), and chloroform] were previously detected in soil gas on the property. These three
constituents and methylene chloride were detected during the winter sampling. Their
concentrations arc shown on Table I along with the June and August 2007 data. EPNG
believes that the concentrations arc within the range the United States Environmental
• Mr. & Mrs. Pete and Darlene Jones
J\pril 28, 2007
Page 2 of3
•
Protection Agency (USEPA) will consider acceptable for soil gas below homes at this
site, as discussed in more detail in this section.
The USEPJ\ has established screening levels to evaluate whether concentrations of VOCs
in the soil gas arc a potential concern for people living in houses above the soil gas.
Table 1 shows the USEPA screening level and the sample result for each site related
VOC in soil gas at the three sampling points on your property.
The USEP A screening levels are established within a range of concentrations that have
been determined to he acceptable based on the potential for adverse health effects over a
lifetime, if one is exposed to that concentration for 30 years. \JSEPA uses this range to
determine if action is recommended to reduce potential exposure to the chemicals.
USEPA policy has determined that:
For concentrations below the lowest acceptable concentration (called the 10·"
level), the possibility ofadvcrsc health risks is extremely low or insignificant.
• For concentrations above the highest end of the range ( called the I 0·4 level),
action to reduce exposure or fu1ther investigation may be warranted.
• For concentrations within the 10·6 to I 0·4 range, action may not be warranted
depending on the level of confidence in the results e.g. a high level of
confidence allows a higher acceptable level.
The concentrations of TCE, methylene chloride, and chloroform, historically and
presently, are below the 10'6 level that USEPA considers acceptable. The observed
concentrations for PCE arc within the I 0'6 to 10·4 range for which further investigation
may not be warranted according to USE!' A conservative risk screening levels. EPNG
believes that these concentrations arc within the range that \JSEPA will consider
acceptable for soil gas below homes at this site.
Results of the Crawl Space Air Samples
PCE, TCE, cis-1,2-dichlorocthene (also called cDCE), chloroform, 1, 1,2-trichloroethane,
and carbon tetrachloride were detected in the crawl space air samples collected in
February (See Table 2). TCE, cDCE, and carbon tetrachloride were detected at
concentrations below the 10'6 risk screening level for indoor air. PCE, chloroform, and
I, 1,2-trichlorocthanc were above the Io·" risk screening level but below the I 0·4 risk
level. TCE exceeded the 10·4 risk screening level at one sample. Several other non-site
related constituents were detected in the crawl space air samples; however, only benzene
exceeded a risk screening level. Benzene was estimated at the concentration of
1.2 J mg/m3 for both crawl space locations. This concentration exceeds the I o·6 indoor
air risk screening level of 0.3 I mg/m3; however, it is below the I 0·5 risk screening level.
• Mr. & Mrs. Pete and Darlene Jones
April 28, 2007
Page 3 of3
Next Steps
•
We have now performed three sampling events for soil gas and two sampling events for
crawl space air on your property. These events were purposely performed at different
times of the year (summer and winter). The results from these events show that the
concentrations of VOCs in soil gas at your property arc consistent and representative,
despite changes in weather that can sometimes affect the detected concentrations. At this
time, and subject of course, to your agreement, we would like to keep the sampling points
available for future sampling. Additionally, should someone move into the house on a
permanent basis, we would want to consider confirmatory sampling within the crawl
space and inside the house.
If we decide to undertake any additional sampling, we will contact you again to explain
what is being planned and why, and to request permission to enter your property. In the
meantime, you should be receiving regular Fact Sheets about site remediation activities to
help keep you up to date on what is happening.
Please feel free to contact me at 713-420-3425 if you would like any additional
information about the vapor intrusion evaluation process. As you know, EPNG is
working under the direction of US EPA and if you have any questions ahout the results or
the comments in this letter, you may contact Ken Mallary of US EPA at 404-562-8802 or
Nile Testerman who is with the North Carolina Department of Environment and Natural
Resources (NCDENR) at 919-508-8482.
Sincerely,
}~~-~
Brian S. Johnson
El Paso Natural Gas Company
cc: Janet McQuaid, EPNG
Jennifer Porter, Gurne Porter, PLLC
Enclosure: Map of Sampling Locations and Tables 1 and 2
ii! E
•
0 ---····--·-"-
E ~ "' 0
-a,
"' ;;;
~
Cl z a. ~ ro a.
~ C ~
Do
□
VP-01N
©
PZ-01N
LEGEND
(!) SHALLOW WELL LOCATION
,/l INTERMEDIATE WELL LOCATION
Q DEEP WELL LOCATION
I
i
PHOENIX STREET
Q SEMI-PERMANENT SOIL GAS SAMPLE LOCATION
Q SEMI-PERMANENT PIEZOMETER LOCATION FOR
GROUNDWATER SAMPLE
• CRAWL SPACE AIR SAMPLE LOCATION (APPROXIMATE)
1540
YADKIN
,,,-,AREA2
STREET AREA 1
VP-01S
s VP-01W
PZ-01W
40
SCALE
•
W-1 Os
,,,a.. (f\ W .. 1 0 Evv ·r;;
W-10i
0 40
SAMPLE LOCATIONS FOR
1540 YADKIN STREET
FCX-ST ATESVILLE SUPERFUND SITE OU3
STATESVILLE, NORTH CAROLINA
80
FEET
134391.001.002 03/08
BROWN AND ~ CA LD VVE I..,J_, N,urhYilhi, Tcnne~slle .___ _______________ _.__ __________ __,
Volatile Organic
Compounds,.
Samnlc Date
f!Low:Ranoe:. tHiah·Rancie:·
Samnlc Interval "'"~"" 0 ID/:6'>"{.•:;;.i'CiJ.'O?':' '-~-~i!:W'/,;;.;-,:;,c02:-,·
VP-01W
612212007
18-20
Lab A
12,800 D1
Table 1
Soil Gas Results
1540 Yadkin Street
West¥
VP-01W VP-01W VP-01W VP-01N
811512007 8/15/2007 2/18/2008 6120/2007
18-20 18-20 18-20 14-16
Lab A LabB LabB Lab A
22 6,000 D 2,700 0 323
Results
1540 Yadkin Street
North South
VP-01N ! VP-01N VP-01N VP-01S VP-01S VP-01S VP-015
8/15/2007 I 8/16/2007 2/18/2008 6/20/2007 8/15/2007 8116/2007 2/18/2008
14-16 14-16 14-16 14-16 14-16 14-16 14-16
Lab A Lab B LabB Lab A Lab A Lab B Lab B
2,850 D 52 150 17,300 D 12,300 D 13,000 D 7.100 0
µgfm~-
µgim' ~~l~i;f::"-g"(fci~~:.~~~i+. ----+-----+----+----+---+----1----+----+------1----+----+-------11
~v_;_"Y_'_ch_1o_ci_d•-------+-µg1_m_'-+'¾---.si cff----+------!----+----+---+----t----+-----!----t-----+----+-----11
ITrlchloroethene (TCE)
cis-1.2-Dichloroethene (cDCE)
8.1 J 8.6 U 11 uo 5,6 8.6 U 8.6 UD 1.1 U
6.3 U 6.3 U 7.9 UD 0.79 U 6.3 U 5.3 UD 0.79 U
1.1 U 10 21 U 21 UD 3.0 J
0.79 U 6.3 U 16 U 16 UD 0.79 U
4.1 U 4.1 U 5.1 uo 0.51 U 4.1 U 4.1 UD 0.51 U 0.51 U 4.1 U 10 U 10 UD 0.51 U
10 U 10 U 13 UD 1.3 U 10 U 10 UD 1.3 U 1.3 U 10 U 25 U 25 UD 1.3 U Carbon letrachloride µg/m3 ~
lfc-,-,0-,-0-,0-,m--------+-µ-g-,-m-,-~+ :fQ5~~J~;
~~,2,;;,;;;cH'8~S:'f-'S'f''8-----l------+----+-----+----+------ll----+----+------l----+----+-------II
µg/m3 ~fJf1}i{)';B~~M: ~~t~y6_:·~??'.fef:
18 5.4 J 11 JD 11 7.8 U 7.8 uo 0.98 U 0.98 U 4.6 J 20 U 20 UD 2.3 J
1, 1-Dk:hforoethene 6.3 U 6.3 U 7.9 UD 0.79 U 6.3 U 5.3 UD 0.79 LI 0.79 U 6.3 U 16 U 16 UD 0.79 U
If--------+---c,f----+----t----+----t----t-----t----t---f---+----+---+------!I
1,2-Diehloropropane µg,'ml 7.4 U
Methylene chloride µg,'m:; 5,6 U
1, 1,2-Trichloroethane µg/ml 8.7 U
FoolnO:es:
•Site-related VOCs as listed in Tat:,le 2 of the September 2006 E:q;lanaaion cf Sig:i:fieat1t Oi:ference !ESD) fOf
FCX Operable Unit J (OU3).
bUnits are in µgtm3 = rni:rog,al':'1$ per cubic meter
7.4· U
5.6 U
8.7 U
~S:":PA Screening Level is from lhe Targel Deep Soll Gas UJncentra!icn C.OrresporKfng to Indoor Air Concentration
(so~ gas to indoor a'r attenuation factor of 0.002) from Table 2c and 3a-SG (1x10..s risk is low range: h10""' is high range)
in the USE PA OSWER Draft Guidaoce !or Eva1u.;ling \~e Vapor lntrusio;i lo lndoo: Ail Pathway fro;n Groondwa~er and So:!s
(S•Jb":.urface Vapor Inti-us ion Guidance] f2002)'"The attenuation faclor of0.002 is recommended for era.vi s~es as
re!erenced by Depa:1ment of To;,;ic Sub.slances Control, Galilomia EPA Interim Final Guidance for the E,.ifualio.1 arid
Ml!igi!tion of Su~surface Va.xx Intrusion to Indoor Aif. Re-.-ised Februa:-y i. 2005.
00:teetion ~.e., r,orth, east south, west) refers to 1he direcli-,n \ties.ample is localed adjacent IC hou5e.
"Feel be!owground surface.
La:,oratorf data qual1fe1s a·e as fol'ows
D means 1hat lhe sample had high cor,cen:rations and was dllu'.ed for analysis
J means the lhe conccn!ratiol1 was dose to the re;K)rting llmil and is estima:ed.
The actual concen:ra'Joo cm::d be sllghUy higher or iowe,.
U means that the VOC was no1 idenlifted in the s~p'e at>?ve the coocentration reporting limit
9.2 UD
82 D
11 UD
0.92 U 7.4 U 7.4 UD 0.92 U 0.92 U 7.4 U 18 U 18 UD 0.92 U
3,8 5.6 U 5.6 UD 14 1.4 J 5.6 U 14 U 200 0 6.2
1.1 U 8.7 V 8.7 UD 1.1 U 1.1 U 8.7 U 22 U 22 UD 1.1 u
•
•
•
Table 2
Crawl Space Air Results
1540 Ya°dkln Street
I
•
Volatile Organic
Compounds• Results for 1540 Yadkin Street
Sam le Date 8/15/2007
Sample Interval ft/bgs 11
Lab
Tetrachloroethene {PCE) µg/m3 1.6 1.6
Trichloroethene (TCE) µg/ml 1.1 U 1.1 U
cis•1,2-Dichloroethene (cDCE) µg/mi 0.79 U 0.79 U
Vinyl chloride µg/ml 0.51 U 0.51 U
Carbon tetrachloride µg/m3 1.3 U 1.3 U
Chloroform µgfm3 0.98 U 0.96 U
1, 1•Dichloroethene µg/m3 0.79 U 0.79 U
1,2-Dichloropropane µg/ml 0.92 U 0.92 U
Methylene chloride µg/m3 0.69 U 0.69 U
1, 1,2-T richloroethane µg/m3 1.1 U 1.1 U
Footnotes:
'Site-related VOCs as listed fl Table 2 ol the September 2006 Explanation of Significant Difference (ESD) for
FCX Operable Uni1 3 (OUJ}.
bUnils are in µg/ml = micrograms per cubic meter
cUSEPA Screening Level is from the Indoor Air Concentration
8/15/2007
Arca 1
Lab B
2.4 J e
1.2 J
0.99 J
0.72 J
2.0 J
1.3 J
0.99 J
0.92 U
1.3 J
1.1 U
in the USEPA OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwa1er and Soils
(Subsurface Vapor Intrusion Guidance) (2002)
°Fee\ below ground surface.
0 Laboratory data qualifiers are as follows:
D means Lhat the sample had high concentrations and was diluted lor analysis
J ITleans the the concentralion was close lo the reporting limit and tS estimated.
The actual concentration could be srightly higher Of lower.
U means that the VOC was not identified in the sample above the concentration reporting lim"rt.
Tnt,lo 1 1540 Yndk.il'l crawl spac~
Crawl S ace
2/25/2008 8115/2007
Aroa 1
CS-01W Arca 2
Lab B Lab A
0.543 J 1.7
6.6 i.1 u
0.198 J 0.79 U
0.0256 J 0.51 U
0.126 U 1.3 U
0.146 J 0.98 U
0.0396 J 0.79 U
0.139 U 0.92 U
0.695 0.69 U
0.273 1.1 U
8/15/2007 2/25/2008
Area 2
Area 2 ICS-01E
Lab B Lab B
1.4 U 0.407 J
1.1 U 0.107 J
0.79 U 0.0555 U
0.51 U 0.0256 J
1.3 U 0.126 J
0.98 U 0.146 J
0.79 U 0.0236 U
0.92 U 0.139 U
0.69 U 0.347
1.1 U 0.109 U
•
A elpaso
A pri I 28, 2008
Mr. and Mrs. Pete and Darlene Jones
1536 Yadkin Street
Statesville, NC 28677
Re: 1536 Yadkin Street
1001 Louisiau11 Strccl
I louston, TX 77002
71)-420-3827
FCX-Statesvillc Superfund Site, Operable Unit 3, Statesville, NC (OU3 or site)
Dear Mr. and Mrs. Jones:
I am writing to follow up on the recent subsurface sampling that was performed as part of
a vapor intrusion evaluation at 1536 Yadkin Street. As you arc aware, Brown and
Caldwell (BC) on behalf of El Paso Natural Gas Company (EPNG) installed three semi-
permanent soil gas points and one temporary groundwater sample point (piczomcter) on
the property on February 14, 2008. One groundwater sample was collected on February
19, 2008 and on February JR and 19, 2008 BC collected three soil gas samples from the
soil gas points. The locations from which these samples were taken are shown on the
Sampling Location Map (attached).
These samples were collected because there arc volatile organic compounds (VOes) in
the groundwater under the houses in your area, including your house. The source of the
voes was explained in the letter El'NG sent to you on February 11, 2008. "Volatile"
means that voes can evaporate out of groundwater. Evaporated VOCs could move
through the soil gas into buildings above the groundwater. "Soil vapor or soil gas" are
terms used to describe the gas or vapor contained in the soil above the groundwater.
This letter presents information on the laboratory results of the soil gas and groundwater
samples and next steps proposed by El'NG.
Results of the Soil Gas Samples
Soil gas samples from your properly contained five of the ten VOCs identified as being
present at the former Burlington Plant (now owned by EPNG) (referred lo in this letter as
"site related chemicals" or "site related voes"). Three of these site related chemicals i.e.
tctrachloroethcnc, (also called perchloroethylcne or PeE), chloroform, and methylene
chloride were detected within shallow soil gas samples and their concentrations are
shown on Table I. "Shallow" soil gas results refer to samples collected from 5-7 feet
below the ground surface. Site related chemicals i.e. PCE, trichlorocthenc (also called
• • Mr. and Mrs. Pete & Ms. Jones
April 28, 2008
Page 2 of3
TCE), chloroform, methylene chloride, and 1, I ,2-trichloroethane were detected within
the "deep" soil gas sample and their concentrations are shown on Table 2. "Deep" soil
gas samples generally arc collected from greater than 7 feet below ground surface. In this
case, a "deep" soil gas sample was collected from 18-20 feel below the ground surface.
EPNG believes that the concentrations are within the range the United States
Environmental Protection Agency (USEPA) will consider acceptable for soil gas below
homes at this site, as discussed in more detail in this section.
The USEPA has established screening levels to evaluate whether concentrations of VOCs
in the soil gas are a potential concern for people living in houses above the soil gas.
Table 1 and Table 2 show the USEPA screening level and the sample result for each site
related VOC in soil gas at the three sampling points on your property for respective soil
depth.
The USEPA screening levels arc established within a range of concentrations that have
been determined to be acceptable based on the potential for adverse health effects over a
lifetime, if one is exposed to that concentration for 30 years. USEPA uses this range to
determine if action is recommended to reduce potential exposure to the chemicals.
USEPA policy has determined that:
For concentrations below the lowest acceptable concentration (called the 10-6
level), the possibility of adverse health risks is extremely low or insignificant.
For concentrations above the highest end of the range (called the 10·4 level),
action to reduce exposure or further investigation may be warranted.
For concentrations within the 1 o·6 to 10-4 range, action may not be warranted
depending on the level of confidence in the results e.g. a high level of
confidence allows a higher acceptable level.
The methylene chloride concentration in shallow soil gas is below th~ 1 o·6 risk screening
level. The observed concentrations for PCE and chloroform in shallow soil gas arc
within the 1 o-6 to 104 risk screening level range. The concentrations of Pc'E, TCE,
chloroform, methylene chloride, and 1,1,2-trichloroethane in deep soil gas are below the
1 o-<, risk screening levels that US EPA considers acceptable. The observed concentrations
for !'CE and chloroform arc within the range for which further investigation may not be
warranted according to USEPA conservative risk screening levels. EPNG believes that
these concentrations are within the range that USE!' A will consider acceptable for soil
gas below homes at this site.
Results of the Groundwater Sample
There were no OUJ VOC detections in groundwater above respective performance
standards. Table 3 shows the USEPA performance standard for each VOC detected in
•
Mr. and Mrs. Pete & Ms. Jones
April 28, 2008
Page 3 of3
•
groundwater for OU3 and the concentration of that substance at the sampling points on
the property. These performance standards assume that the groundwater is used for
drinking. As you are aware, there arc no groundwater wells at the site (except for the
piczomcter installed by EPNG that is not used for any other purpose), and the City of
Statesville supplies drinking water to the neighborhood. Consequently, there is no
exposure to VOCs from the groundwater.
Next Steps
On technical review, the data indicate that the concentrations of VOCs in soil gas pose
little concern for human health in indoor air on your property; however, to confirm that
the VOC results from this event are consistent and representative, we would like· to
perform another round of sampling, at your property, possibly in the summer months.
We would like to keep the sampling points available for this re-sampling. We will
contact you again when planning for this future sampling event is fwthcr advanced to
explain what we intend to do and to request your concurrence. In the meantime, you
should be receiving regular Fact Sheets about site remediation activities to help keep you
up to date on what is happening.
Please feel free to contact me at 713-420-3425 if you would like any additional
information about the vapor intrusion evaluation process. As you know, EPNG is
working under the direction of USEPA. If you have any questions, please contact Ken
Mallary of USEPA at 404-562-8802 or Nile Testerman who is with the North Carolina
Department of Environment and Natural Resources (NCDENR) at 919-508-8482.
Sincerely,
i~J.~
Brian S. Johnson
El Paso Natural Gas Company
cc: Janet McQuaid, EPNG
.Jennifer Porter, Gurne Porter, PU.,C
Enclosure: Map of Sampling Locations, Tables I, Table 2, and Table 3
~ ;J;
~ ii
~ a. w .,,
~ a.
!/;!
c ~ ~
•
0
1' ---... . .... -------··vP-17Ed ____ _
. ····-/
'
D □
LEGEND
iJ:i SHALLOW WELL LOCATION
Q SEMI-PERMANENT SOIL GAS SAMPLE LOCATION
Q SEMI-PERMANENT PIEZOMETER LOCATION FOR GROUNDWATER SAMPLE
PZ-17s W) VP-1 ?Es
1536
YADKIN
STREET
n
40
SCALE
•
V,J ... ,. l 8 ~· c::;
0 40
SAMPLE LOCATIONS FOR
1536 YADKIN STREET
FCX-STATESV!LLE SUPERFUND SITE OU3
ST A TESVILLE, NORTH CAR OU NA
80
FEET
13-4391.001.002 03108
a..__ ____________________ ...J. _______________ ..
BROWN AND
CALDWELL Nnshvllle, TennoHeo
•
Table 1
Shallow Soil Gas Results
1536 Yadkin Street
•
Volatile Organic
Compounds•
Results
1536 Yadkin St.
East West
VP-17Es VP-17W
mon 2/19/2008 2/19/2008
ft/b 5-7 5-7
Tetrachloroethene (PCE) 1.4 u' 160
Trichloroethene (TCE) 1.1 U 1.1 U
cis-1,2-Dichloroethene (cDCE) µg/m3 0.79 U 0.79 U
Vinyl chloride 0.51 U 0.51 U
Carbon tetrachloride 1.3 U 1.3 U
Chloroform µg/m3 0.98 U 3.9 J
1, 1-Dichloroethene µg/m3 0.79 U 0.79 U
1,2-Dichloropropane 0.92 U 0.92 U
Methylene chloride µg/m' 0.76 J 2 0 J
1, 1,2" Trichloroethane µg/m3 1.1 U 1.1 U
Footnotes:
'Site-related VOCs as listed in Table 2 of the September 2006 Explanation of Significant Difference (ESD) lor
FCX Operable Unit 3 (OU3).
'Units are in µg/m3 = micrograms per cubic meter
'USE PA Screening Level is from the Target Shallow Soil Gas Concentration Corresponding to Indoor Air Concentration
(soil gas to indoor air attenuation factor of 0.1) from Table 2c and 3a-SG (1 x10'6 risk is low range; 1x1 o" is high range)
in the USEPA OSWER Draft Guidance for Evaluating the Vapm Intrusion to Indoor Ajr Pathway from Groundwater and Soils
(Subsurface Vapor Intrusion Guidance) (2002)
'Direction (i.e., north, east, south, west) refers to the direction the sample is located adjacent to house.
'Feet below ground surface.
1 Laboratory data qualifiers are as follows:
J means the the concentration was close to the reporting limit and is estimated.
The actual concentration could be slightly higher or lower.
U means that the voe was not identified in the sample above the concentration reporting limit.
Table 1 1536 Yadkin Shallow SG
Volatile Organic
Compounds'
Sam le Date
Sam le Interval
Tetrachloroethene (PCE)
Trichloroethene (TCE)
•
cis-1,2-Dichloroethene (cDCE)
Vinyl chloride
Carbon tetrachloride
Chloroform
1, 1-Dichloroethene
1,2-Dichloropropane
Methylene chloride
1, 1,2-Trichloroethane
Footnotes:
Table 2
Deep Soil Gas Results
1536 Yadkin Street
µg/m3
µg/m3
µg/m3
µg/m3
µg/m3
µg/m3
µg/m3
µg/m3
µgim3
µg/m3
•
Results
1536 Yadkin St.
East'
VP-17Ed
2/18/2008
18-20
80
1.4 J
0.79 U
0.51 U
1.3 U
1.2 J
0.79 U
0.92 U
4.1
2.5 J
'Site-related voes as listed in Table 2 of the September 2006 Explanation of Significant Difference (ESD) for
FCX Operable Unit 3 (OU3).
'Units are in µg/m3 = micrograms per cubic meter
'USEPA Screening Level is from the Target Shallow Soil Gas Concentration Corresponding to Indoor Air Concentration
(soil gas lo indoor air attenuation factor of 0.002) from Table 2c and 3a-SG (1x10'6 risk is low range; 1x10'4 is high range) in the USEPA OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils (Subsurface Vapor Intrusion Guidance) (2002)"The attenuation factor of 0.002 is recommended for crawl spaces as referenced by Department of Toxic Substances Control, California EPA Interim Final Guidance for the Evaluation and Mitigation of Subsurface Vapor Intrusion lo Indoor Air, Revised February 7, 2005.
'Direction (i.e., north, east, south, west) refers lo the direction the sample is located adjacent to house.
'Feet below ground surface.
1 Laboratory data qualifiers are as follows:
J means the the concentration was close to the reporting limit and is estimaled.
The actual concentration could be slightly higher or lower.
U means that the VOC was not identified in the sample above the concentration reporting limit.
Table 1 1536 Yadkin Deep SG
•
Volatile Organic
Compounds'
Sam le Date
Sam le Interval
T etrachloroethene (PCE)
Trichloroethene (TCE)
Table 3
Groundwater Sample Results
1536 Yadkin Street
Units" Groundwater
Performance
Standardsc
µg/L
µg/L
cis-1,2-Dichloroethene (cDCE) µg/L
Vinyl chloride µg/L
Carbon tetrachloride µg/L
Chloroform µg/L
1, 1-Dichtoroethene µg/L
1,2-Dichloropropane .µg/L
Methylene chloride µg/L
1, 1,2-Trichloroethane µg/L
Footnotes:
•
Results
1536 Yadkin
Street
PZ-17s
2/19/2008
34.39
0.1 u'
0.1 U
0.8 U
0.1 U
0.1 U
0.8 U
0.8 U
0.1 U
2.0 U
0.8 U
'Site-rnlated voes as listed in Table 2 of the September 2006 Explanation of Significant Difference (ESD)
for FCX Operable Unit 3 (OU3).
"Units are in µg/L = micrograms per liter
'Groundwater Performance Standards for site-related voes are listed in Table 2 of the September 2006
ESD for FeX OU3.
'Feet below ground surface
'Data qualifiers are as follows:
U means that the VOC was not identified in the sample above the concentration reporting limit.
Table 2 1536 Yadkin Water
• •
Communication Data Sheet
FCX-Statesville Superfund Site OU3
Date: Time:
Owner/Resident Name: Debra Sebastian / Arla Plasky Co-owners
Address: 605 Phoenix Street
Phone number: 704-872-3437
Best Contact number:
Purpose of Meeting: Discuss February 2008 Soil Gas & Groundwater Sampling Results
Documents left with owner/resident:
Documents shared but not left with owner/resident:
Content of Meeting:
Action Items for Follow-up:
Return visit?
Additional information to be mailed?
Follow-up phone call?
Other?
Personnel Conducting Meeting:
P:\ClientslEI Paso\!:PNG FCX\134391-FCX Winter 2008 Vapor Sampling\001-002\Communication Data Sheels\Shirley Jones.~ls 4/27/2008
•. ,, •
A elpaso
April 28, 2008
Debra Sebastian and Arla Plasky
809 Alexander Street
Statesville, NC 28677
RE: 605 Phoenix Street
• i::. /e loyr
I 00 I l .ouisiana .'-i1rc..:1
Hm1slon, TX 77002
713-420-3827
FCX-Statesville Superfund Site Operable Unit 3, Statesville, NC (OU3 or site)
Dear Ms. Sebastian and Ms. Arla Plasky:
I am writing to follow up on the recent subsurface sampling that was performed as part of
a vapor in.trusion evaluation at 605 Phoenix Street. As you arc aware, Brown and
Caldwell (BC), on behalf of El Paso Natural Gas Company (EPNG), re-sampled the two
soil gas sampling points on the property on February 19 and 20, 2008. The locations
from which these samples were taken are shown on the Sampling Location Map
(attached).
These samples were collected because there arc volatile organic compounds (VOCs) in
the groundwater under some properties in your area, including your properly. The source
of the VOCs was explained in the letter EPNG sent to you on May 11, 2007. "Volatile"
means that VOCs can evaporate out of groundwater. Evaporated VOCs could move
through the soil gas into buildings above the groundwater. "Soil vapor or soi I gas" are
terms used to describe the gas or vapor contained in the soil above the groundwater.
This letter presents information on the laboratory results of the soil gas and next steps
proposed by EPNG.
Results of the Soil Gas Samples
The results from this sampling event indicate that soil gas samples from your property
contained three of the ten VOCs identified as being present at the former Burlington Plant
(now owned by EPNG) (referred to in this letter as "site related chemicals" or "site
related VOCs"). These three site related chemicals i.e. tetrachloroethcne, (also called
perchlorocthylene or PCE), methylene chloride, and chloroform were detected in soil gas
and their concentrations arc shown on Table l along with the June 2007 results. The
three detected VOCs, although not detected in the June 2007 sampling event, were
detected at very low concentrations. EPNG believes that the concentrations are within
• • Ms. Sebastian and Ms. Plasky
April 28, 2008
Page 2 of3
the range the United States Environmental Protection Agency (USEP A) will consider
acceptable for soil gas below homes at this site, as discussed in more detail in this
section.
The USEPA screening levels arc established within a range of concentrations that have
been determined to be acceptable based on the potential for adverse health effects over a
lifetime, if one is exposed to that concentration for 30 years. USEPA uses this range to
determine if action is recommended to reduce potential exposure to the chemicals.
USE!' A policy has determined that:
• For concentrations below the lowest acceptable concentration (called the 1 o·<,
level), the possibility of adverse health risks is extremely low or insignificant.
• For concentrations above the highest end of the range (called the I0-4 level),
action to reduce exposure or further investigation may be warranted.
For concentrations within the 10·6 10 10·4 range, action may not he warranted
depending on the level of confidence in the results e.g. a high level of
confidence allows a higher acceptable level.
The concentrations of PeE and methylene chloride are below the 10·6 level that USEPA
considers acceptable. The one detection of chloroform was slightly above the I 0-6 risk
screening level but below the 10·5 risk screening level. The concentration of chloroform
in soil gas is within the range for which further investigation may not be warranted
according to USEPA conservative risk screening levels. EPNG believes that these
concentrations are within the range that USEPA will consider acceptable for soil gas
below homes at this site.
Next Steps
We have now performed two sampling events on your properly. These events were
purposely performed at different times of the year (summer and winter). The results from
these events show that the concentrations of voes in soil gas at your property are
consistent and representative, despite changes in weather that can sometimes affect the
detected concentrations. The results also indicate, based on USEP A standards, that the
voes detected pose little concern for human health in indoor air on your property. At
this time, and subject of course, to your agreement, we would like to keep the sampling
points available for future sampling. If we decide to undertake any additional sampling,
we will contact you again lo explain what is being planned and why, and to request
permission to enter your property. Please be assured that when the sampling points are
removed, the area will be restored to its original condition. In the meantime, you should
be receiving regular Fact Sheets about site remediation activities to help keep you up to
date on what is happening.
•
Ms. Sebastian and Ms. Plasky
April 28, 2008
Page 3 of3
•
Please feel free to contact me at 713-420-3425 if you would like any additional
information about the vapor intrusion evaluation process. As you know, EPNG is
working under the direction of USEPA. If you have any questions, please contact Ken
Mallary of USEPA at 404-562-8802 or Nile Testerman who is with the No11h Carolina
Department of Environment and Natural Resources (NCDENR) at 919-508-8482.
Sincerely,
!) ;v.L,vv\ ;_~ -J<y/l,,v~O~
Bnan S. Johnson
El Paso Natural Gas Company
cc: Janet McQuaid, EPNG
Jennifer Porter, Gurne Porter, PLLC
Ken Mallary, USEPA
Nile Testerman, NCDENR
Enclosure: Map of Sampling Locations and Table I
• •
LJ I ~I I
I I ' I
I I I I I I / l
PHOENIX STREET
\ r i '\ I \ ' -
I i I I ! ! I
I I I I
I ' \ I ' \ I ' ' ' I I
I i \ i I I I ! ' I \ I I i --·-·····\ i r--' ' I ,..J
VP-09~ I
-···/ I 605 PHOENIX I
I I STREET I
!I --I I I
I I • ..... ' ·1 I I I '
I
I I I I I ' VP-09W I
I 0 I I I
I ID ' ~ ' ! I 5 ' i " I I [ ····-···-· !..
····· i -C3 I ~ ' a. ...... ... -e
!
~
: ' I "' I ~ a, I E I
I
8, I
I ro
i
! 2 i ~ LEGEND 0 40 80 X 40 u
> g
N
u.
~ 0 SEMI-PERMANENT SOIL GAS SAMPLE LOCATION SCALE FEET a,
M ;:i;
Si SAMPLE LOCATIONS FOR u
605 PHOENIX STREET u.
CJ z a.
!!;
FCX-STATESVILLE SUPERFUNO SITE OU3 ~ ro
STATESVILLE, NORTH CAROLINA a.
ill 1!i 134391.001.002 03108
C
BROWN •• AND ~ CALDW'ELL Nnshvi\lc, Tennessee a.
•
Table 1
Shallow Soil Vapor Results
605 Phoenix Street .
•
Volatile Organic
Compo,unds a
Results
605 Phoenix
West
VP-09W VP-09W
Sam le Date 6/20/2007 2/2012008
Sam le Interval 5-7 5-7
Lab Lab A Lab B
Tetrachloroethene (PCE) 11 u1
Trich!oroethene (TCE) 8.6 U
cis-1,2-Dichloroethene {cDCE) µg/m3 6.3 U
Vinyl chloride µg/m3 4.1 U
Carbon tetrachloride µg/m3 10 U
Chloroform µg/m3 7.8 U
1, 1-Dichloroethene µg/m3 6.3 U
1,2-Dichloropropane µg/rn3 7.4 U
Methylene chloride 5.6 U
1, 1,2-T rich!oroethane 6.7 U
Footnotes:
~Site-related VOCs as listed in Table 2 of the September 2006 Explanation of Significant Difference (ESD)
for FCX Operable Unit 3 {OU3).
!>Units are in µg/m3 = micrograms per cubic meter
1.4 U
1.1 U
0.79 U
0.51 U
1.3 U
0.98 U
0.79 U
0.92 U
0.67 J
1.1 U
cUSEPA Screening Level is from the Target Shallow Soil Gas Concentra1ion Corresponding to Indoor Air Concentration
{soil gas to indoor air attenuation factor of 0.1) from Table 2c and 3a-SG (1x106 risk is low range; 1x10"4 is high range)
in the USEPA OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils
(Subsurface Vapor Intrusion Guidance) (2002)
0Direction (i.e., north. east, west, south) refers to the direction the sample is located adjacent to house.
° Feel below ground surface.
1 Laboratory data qualifiers are as follows:
U means that the VOC was not identified in the sample above 1he concentration reporting limit.
J means the the concentration was close to the reporting limit and is estimated.
The actual concentration could be slightly higher or lower.
North
VP-09N VP-09N
6/20/2007 2/19/2008
5-7 5-7
Lab A Lab B
11 U 1.8 J
8.6 U 1.1 U
6.3 U 0.79 U
4.1 U 0.51 U
10 U 1.3 U
7.8 U 3.0 J
6.3 U 0.79 U
7.4 U 0.92 U
5.6 U 0.60 J
8.7 U 1.1 U
Date:
Owner/Resident Name:
Address:
Phone number:
Best Contact number:
Purpose of Meeting:
• •
Communication Data Sheet
FCX-Statesville Superfund Site OU3
Time:
Alan Plasky (Tenant)
605 Phoenix Street
Discuss February 2008 Soil Gas & Groundwater Sampling Results
Documents left with owner/resident:
Documents shared but not left with owner/resident: .,_IV,,_'"'-------------------
sl...JrJ. hl1tl:: fai,)$ -iJs:r -J'/Jl v-/J,4( ,l:t~t1J 1.,,UL ~vi ![/1t/t t1).,1"7-t/'"l.._
Action Items for Follow-up: -+!''-''"l?-'tt,,,=~=-i&o=<<.lcs'"'''""·'"-5$.,__ ________________ _
Return visit?
Additional information to be mailed?
Follow-up phone call?
Other?
Personnel Conducting Meeting:
P:\Clients\EI Paso\EPNG FCX\134391 -FCX Winter 2008 Vapor Sampting\001-002\Communicalion Data Sheets\A.lan Plasky.xis 412712008
, •
A elpaso
April 28, 2008
Alan Plasky
605 Phoenix Street
Statesville, NC 28677
RE: 605 Phoenix Street
•
1001 Louisianu St1cct
I louston, TX 77002
713-420-382)
FCX-Statcsville Supcrfund Site Operable Unit 3, Statesville, NC (OU3 or site)
Dear Mr. Plasky:
I am writing to follow up on the recent subsurface sampling that was performed as part of
a vapor intrusion evaluation at 605 Phoenix Street. As you arc aware, Brown and
Caldwell (BC), on behalf of El Paso Natural Gas Company (EPNG), re-sampled the two
soil gas sampling points on the property on February 19 and 20, 2008. The locations
from which these samples were taken arc shown on the Sampling Location Map
(attached).
These samples were collected because there arc volatile organic compounds (VOCs) in
the groundwater under some properties in your area, including your propeny. The source
of the VOCs was explained in the letter EPNG sent to you on May 11, 2007. "Volatile"
means that VOCs can evaporate out of groundwater. Evaporated VOCs could move
through the soil gas into buildings above the groundwater. "Soil vapor or soil gas" arc
terms used to describe the gas or vapor contained in the soil above the groundwater.
This letter presents information on the laboratory results of the soil gas and next steps
proposed by EPNG.
Results of the Soil Gas Samples
The results from this sampling event indicate that soil gas samples from your property
contained three of the ten VOCs identified as being present at the former Burlington Plant
(now owned by EPNG) (referred to in this letter as "site related chemicals" or "site
related VOCs"). These three site related chemicals i.e. tctrachloro.ethene, (also called
perchloroethylcne or PCE), methylene chloride, and chloroform were detected in soil gas
and their concentrations arc shown on Table 1 along with the June 2007 results. The
three detected VOCs, although not detected in the June 2007 sampling event, were
Mr. Alan Plasky
April 28, 2008
Page 2 of3
• •
detected at very low concentrations. EPNG believes that the concentrations are within
the range the United States Environmental Protection Agency (USEPA) will consider
acceptable for soil gas below homes at this site, as discussed in more detail in this
section.
The USEPA screening levels arc established within a range of concentrations that have
been determined to be acceptable based on the potential for adverse health effects over a
lifetime, if one is exposed lo that concentration for 30 years. USEPA uses this range to
determine if action is recommended to reduce potential exposure to the chemicals.
USEPA policy has determined that:
• For concentrations below the lowest acceptable concentration (called the I o-i,
level), the possibility of adverse health risks is extremely low or insignificant.
• For concentrations above the highest end of the range (called the 10·4 level),
action to reduce exposure or further investigation may be warranted.
• For concentrations within the I o-6 to I 0·4 range, action may not be warranted
depending on the level of confidence in the results e.g. a high level of
confidence allows a higher acceptable level.
The concentrations of PCE and methylene chloride are below the 10·6 level that USE!' A
considers acceptable. The one detection of chloroform was slightly above the I o·6 risk
screening level but below the I 0·5 risk screening level. The concentration of chloroform
in soil gas is within the range for which further investigation may not be warranted
according to USEPA conservative risk screening levels. EPNG believes that these
concentrations arc within the range that USEPA will consider acceptable for soil gas
below homes at this site.
Next Steps
We have now performed two sampling events on your property. These events were
purposely performed at different times of the year (summer and winter). The results from
these events show that the concentrations of VOCs in soil gas at your property arc
consistent and representative, despite changes in weather that can sometimes affect the
detected concentrations. The results also indicate, based on USEPA standards, that the
VOCs detected pose little concern for human health in indoor air on your property. At
this time, and subject of course, to your agreement, we would like to keep the sampling
points available for future sampling. If we decide to undertake any additional sampling,
we will contact you again to explain what is being planned and why, and to request
permission to enter your prope,ty. Please be assured that when the sampling points arc
removed, the area will be restored to its original condition. In the meantime, you should
Mr. Alan Plasky
Apri I 28, 2008
Page 3 of3
• •
be receiving regular Fact Sheets about site remediation activities to help keep you up to
date on what is happening.
Please feel free to contact me al 713c420-3425 if you would like any additional
information about the vapor intrusion evaluation process. As you know, EPNG is
working under the direction of USEPA. If you have any questions, please contact Ken
Mallary of USEPA at 404-562-8802 or Nile Testerman who is with the North Carolina
Department of Environment and Natural Resources (NCDENR) at 919-508-8482.
Sincerely,
h /'lct,l.,v, 1-l <) r"\/J 1fi)
Brian S. Johnson
El Paso Natural Gas Company
cc: Janet McQuaid, EPNG
.Jennifer Porter, Gurne Porter, PLLC
Ken Mallary, USEPA
Nile Testerman, NCDENR
Enclosure: Map of Sampling Locations and Table 1
• •
i I LJ ' ---0---®-! I '
I ' I
! : :
' ! /
I !
I
I
PHOENIX STREET
-If i
' I
' ' ' ' ' ; ! ' ' i I \ !
i i
I ' ·,
I '.
! ' ' ,-J --·. ' __,
' i
VP-09N i 605 PHOENIX I; Cl STREET i,; --;i ' ,,
I .. -·-.:!
I .,
: C
VP-09W ' "
' D '
I
[ .. ----·-··· ···-------.. -· ··--·-. ····---······----··--·-8·· ----·---· ···----..... . ·---·· ----····'·· -··-· ...... -·····-. ... ··-······ . ._,
-
'
~ :
' -
LEGEND
40 0 40 80
' 0 SEMI-PERMANENT SOIL GAS SAMPLE LOCATION SCALE FEET
SAMPLE LOCATIONS FOR
605 PHOENIX STREET
0
FCX-STATESVILLE SUPERFUND SITE OU3
w ~ a_
STATESVILLE, NORTH CAROLINA g:i w 134391.001.002 03/08 Ci
SJ a_
BROWN " AND "
I CALDWELL Nashville, Tenn!l&Se<:i
•
Table 1
Shallow Soil Vapor Results
605 Phoenix Street
•
Volatile Organic
Compounds"-
Results
605 Phoenix
West
VP-09W
Sam le Date 6120/2007
Sam le Interval ft/b s e 5-7
Lab Lab A
Tetrachloroethene (PCE) µg/mJ 11 u'
Trichloroethene (TCE) µg/mJ 8.6 U
cis-1,2-Oichloroethene (cDCE) µg/mJ 6.3 U
Vinyl chloride µg/m3 4.1 U
Carbon tetrachloride µg/m3 10 U
Chloroform µg/mJ 7.8 U
1,1-Dichloroethene µg/ml 6.3 U
1,2-Dichloropropane µg/mJ 7.4 U
Methylene chloride µg/mJ 5.6 U
1, 1,2-Trichloroethane µg/ml 8.7 U
Footnotes:
3Site-rolated VOCs as listed in Table 2 of !he September 2006 Explanation of Significant Difference (ESD)
fot FCX Opetable Unil 3 (OU3).
bUnits are in µg/m3 = micrograms per cubic meter
VP-09W
212012008
5-7
Lab B
1.4 U
1.1 U
0.79 U
0.51 U
1.3 U
0.98 U
0.79 U
0.92 U
0.87 J
1.1 U
cUSEPA Screening Level is from the Target Shallow Soil Gas Concentration Corresponding to Indoor Air Concentration
(soil gas to indoor air attenuation factor of 0.1) from Table 2c and 3a-SG (1x10 6 risk is low range; 1 x10--4 is high range)
in the USEPA OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils
{Subsurface Vapor Intrusion Guidance) (2002)
dDirection {i.e., north, east. west. south) refers to the direction the sample is localed adjacent to house.
e Feet below ground surface.
1 laboratory data qualifiers are as fo!lov.-s:
U means that the VOC was not identified in the sample above the concentration reporting limit.
J means the the concenlration was close to the reporting limit and is estimated.
The actual concentration could be slightly higher or lower.
North
VP-09N VP-09N
6/2012007 211912008
5-7 5-7
Lab A LabB
11 U 1.8 J
8.6 U 1.1 U
6.3 U 0.79 U
4.1 U 0.51 U
10 U 1.3 U
7.8 U 3.0 J
6.3 U 0.79 U
7.4 U 0.92 U
5.6 U 0.80 J
8.7 U 1.1 U
• •
Communication Data Sheet
FCX-Statesville Superfund Site OU3
Date: Time:
Owner/Resident Name: Shirley Jones (Ten ant)
Address: 601 Phoenix Street
Phone number: 704-924-7129
Best Contact number:
Purpose of Meeting: Discuss February 2008 Soil Gas & Groundwater Sampling Results
Documents left with owner/resident:
Documents shared but not left with owner/resident:
Content of Meeting:
/] d;,~/(f/(1 -;/,, 0
Action Items for Follow-up:
Return visit?
Additional information to be mailed?
Follow-up phone call?
Other?
Personnel Conducting Meeting:
flt
P:IClientsll:I Paso\EPNG FCX\134391 -FCX Win1er 2008 Vapor Sampling\001-002\Communication Data Sheets\Shirley J0Mli.x/s 412712008
•
A elpaso
April 28, 2008
Shirley Jones
601 Phoenix Street
Statesville, NC 28677
RE: 60 I Phoenix Street
•
1001 I ,ouisiana Street
I louston, TX 77002
713-420-3827
FCX-Statcsville Supcrfund Site Operable Unit 3, Statesville, NC (OU3 or site)
Dear Ms. Jones:
I am writing to follow up on the recent subsurface sampling that was performed as part of
a vapor intrusion evaluation at 601 Phoenix Street. As you are aware, Brown and
Caldwell (BC), on behalf of El Paso Natural Gas Company (EPNG), re-sampled the two
soil gas sampling points on the property on February 19, 2008. An additional soil gas
point was also installed and sampled during this time. The locations from which these
samples were taken are shown on the Sampling Location Map (attached).
These samples were collected because there arc volatile organic compounds (VOCs) in
the groundwater under some properties in your area, including your property. The source
of the VOCs was explained in the letter EPNG sent to you on May 11, 2007. "Volatile"
means that VOCs can evaporate out of groundwater. Evaporated VOCs could move
through the soil gas into buildings above the groundwater. "Soil vapor or soil gas" arc
terms used to describe the gas or vapor contained in the soil above the groundwater.
This letter presents information on the laboratory results of the soil gas and next steps
proposed by EPNG.
Results of the Soil Gas Samples
The results from this sampling event indicate that soil gas samples from your property
contained three of the ten VOCs identified as being present at the former Burlington Plant
(now owned by EPNG) (referred to in this letter as "site related chemicals" or "site
related VOCs"). These three site related chemicals are tetrachlorocthcnc, (also called
perchloroethylene or PCE), methylene chloride, and chloroform; their concentrations arc
shown on Table I along with the June 2007 results. The three detected VOCs, although
not detected in the June 2007 sampling event, were detected at very low concentrations.
EPNG believes that the concentrations are within the range the United States
Ms. Jones
April 28, 2008
Page 2 of3
• •
Environmental Protection Agency (USE!' A) will consider acceptable for soil gas below
homes at this site, as discussed in more detail in this section.
The USE!' A screening levels are established within a range of concentrations that have
been determined to be acceptable based on the potential for adverse health effects over a
lifetime, if one is exposed to that concentration for 30 years. USEPA uses this range to
determine if action is recommended to reduce potential exposure to the chemicals.
USEPA policy has determined that:
• For concentrations below the lowest acceptable concentration (called the I fr6
level), the possibility of adverse health risks is extremely low or insignificant.
• For concentrations above the highest end of the range (called the 10·4 level),
action to reduce exposure or further investigation may be warranted.
• For concentrations within the 10·6 to 10-4 range, action may not be warranted
depending on the level of confidence in the results e.g. a high level of
confidence allows a higher acceptable level.
The concentrations of PeE and methylene chloride are well below the 1 o-6 risk screening
level that USEPA considers acceptable indicating that the voes in soil gas do not pose a
concern to indoor air. The chloroform detection was slightly above the I o-6 risk
screening level but below the 10·5 risk screening level. The concentration of chloroform
in shallow soil gas is within the range for which further investigation may not be
warranted according to USE!' A conservative risk screening levels. EPNG believes that
these concentrations arc within the range that USE!' A will consider acceptable for soil
gas below homes at this site.
Next Steps
We have now performed two sampling events on your property. These events were
purposely perforrned at different times of the year (summer and winter). The results from
these events show that the concentrations of voes in soil gas at your property arc
consistent and representative, despite changes in weather that can sometimes affect the
detected concentrations. The evidence indicates that the concentrations of voes in soil
gas pose little concern for human health in indoor air on your property. At this time, and
subject of course, to your agreement, we would like to keep the sampling points available
for future sampling. If we decide to undertake any additional sampling, we will contact
you again to explain what is being planned and why, and to request permission to enter
your property. Please be assured that when the sampling points arc removed, the area
will be restored to its original condition. In the meantime, you should be receiving
regular Fact Sheets about site remediation activities to help keep you up to date on what
is happening.
Ms. Jones
April 28, 2008
Page 3 of3
• •
Please feel free to contact me at 713-420-3425 if you would like any additional
information about the vapor intrusion evaluation process. As you know, EPNG is
working under the direction of USEPA. If you have any questions, please contact Ken
Mallary of USEPA at 404-562-8802 or Nile Testerman who is with the North Carolina
Department of Environment and Natural Resources (NCDENR) at 919-508-8482.
Sincerely,
fb~"\ __}\ · fo-1'-A,v. l,
Brian S. Johnson
El Paso Natural Gas Company
cc: Janet McQuaid, EPNG
Jennifer Porter, Gurne Porter, PLLC
Ken Mallary, USEPA
Nile Testerman, NCDENR
Enclosure: Map of Sampling Locations and Tables I and 2
~ ;;;
~
CJ z a. L1J g
~ a.
i " ~ a.
•
PHOENIX STREET
~------J-
L
601 PHOENIX
STREET
VP-07W Q
\
0
VP-07SW
----i----8----....l._--~□
LEGEND 40
ffi SHALLOW WELL LOCATION
(
EB ::l W-21t
V -21 s
I
---Di-----
0 40 80
Q SEMI-PERMANENT SOIL GAS SAMPLE LOCATION SCALE FEET
SAMPLE LOCATIONS FOR
601 PHOENIX STREET
FCX•STATESVILLE SUPERFUND SITE OU3
STATESVILLE, NORTH CAROLINA
134391.001.002 03108
BROWN AND
CALDWELL Nashville, Tennessee
•
Volatile Organic
Compounds a
Table 1
Shallow Soil Gas Results
601 Phoenix Street
•
Unitsb Target Shallow Soil Gas
USEPA Screening Level'
Results
Low range High Range Southwesr
VP-07SW
Sample Date month/da •/year 2/19/2008
Sample Interval ft/bas' 5-7
Lab . · .. Lab B .
Tetrachloroethene (PCE) µg/m3 8.1 810 2.2 J'
Trichloroethene (TCE) µg/m3 0.22 22 . 1.1 U
. : . · ..
cis-1,2-Dichloroethene (cDCE) µg/m3 350 350 0.79 U
Vinyl chloride µg/m3 2.8 280 0.51 U
.
Carbon tetrachloride µg/m3 1.6 160 1.3 U
..
Chloroform µg/m3 1.1 110 1.4 J
.
1, 1-Dichloroethene µg/m3 2,000 2,000 0.79 U
.
1,2-Dichloropropane µg/m3 40 40 0.92 U
Methylene chloride µg/m3 52 5:200 0.69 U
a .
1, 1,2-Trichloroethane µg/m3 1.5 150 1.1 U
Foolnotes:
'Sile-related VOCs as listed in Table 2 of the September 2006 Explanation of Significant Difference (ESD)
for FCX Operable Unit 3 (OU3).
0Units are in µg/m3 = micrograms per cubic meter
'USEPA Screening Level is from the Target Shallow Soil Gas Concentration Corresponding lo Indoor Air Concentration
(soil gas lo indoor air attenuation factor of 0.1) from Table 2c and 3a-SG (1x10"6 risk is low range; 1x10·• is high range)
in the USEPA OSWER Draft Guidance lor Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils
(Subsurtace Vapor Intrusion Guidance) (2002)
'Direction (i.e., north, east, west, south) refers to the direction the sample is located adjacent to house.
'Feet below ground surtace.
1 Laboratory data qualifiers are as follows:
U means that the VOC was not identified in the sample above the concentration reporting limit.
J means the the concentration was close to the reporting limit and is estimated.
The actual concentration could be slightly higher or lower.
•
Volatile Organic
Compounds a
Unitsb
Table 2
Deep Soil Gas Results
601 Phoenix Street
Taiget Deep Soil Gas
USEPA Screenina.Level c:
Low range· • High Range
.··.·.· .-, __ :," VP-07W
•
Results
601 Phoenix Street
Wesr South
VP-07W VP-075 VP-075
Samole Date month/dcl11/vear 6/21/2007 2/19/2008 6/21/2007 2/19/2008
Sample Interval ft/bas9 10-12
Lab . Lab A
Tetrachloroethene (PCE) µg/mJ 405 ·40.500 11 u'
' ·.·
Trichloroethene (TCE) µg/m3 11 1,100 8.6 U
cis-1,2-Dichloroethene (cDCE) µg/mJ 17,500 1,750,000 6.3 U
T
Vinyl chloride µg/mJ '140 14,000 4.1 U .
Carbon tetrachloride µg/mJ 80 8.000 10 U
Chloroform µg/mJ . 55 5,500 7.8 U
1, 1-Dichloroethene µg/mJ .100.000 10.000.000 6.3 U
.
1,2-Dichloropropane µg/mJ 2.000 200,000 7.4 U
Methylene chloride µg/mJ ·2.600 260,000 5.6 U
.
1, 1,2-Trichloroethane µg/mJ 75 7,500 . 8.7 U
Footnotes:
8Site-related VOCs as listed in Table 2 of the September 2006 Explanation of Significant Difference (ESD)
for FCX Operable Unit 3 (OU3).
bUnits are in µg/m3 = mic~ograms per cubic meter
10-12
Lab B
1.4 U
1.1 U
0.79 U
0.51 U
1.3 U
0.98 U
0.79 U
0.92 U
0.76 J
1.1 U
'
cUSEPA Screening level is from the Target Deep Soil Gas Concentration Corresponding to Indoor Air Concentration
(soil gas to indoor air attenuation factor of 0.002) from Table 2c and 3a-SG (1x10.G risk is low range; 1x!O"" is high range)
in the USE PA OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils
(Subsurface Vapor Intrusion Guidance) (2002)*"The attenuation factor of 0.002 is recommended for crawl spaces as
referenced by Department of Toxic Substances Control, California EPA Interim Final Guidance for the Evaluation and
Mitigation of Subsurface Vapor Intrusion to Indoor Air, Revised February 7, 2005.
dDirection (i.e., north, east, west, south) refers to the direction the sample is located adjacent to house.
eFeet below ground surface.
1 laboratory data qualifiers are ~s follows:
U means that the VOC was not identified in the sample above the concentration reporting limit.
J means the the concentration was dose to the reporting limit and is estimated.
The actual concentration could be slightly higher or lower.
6-8 6-8
Lab A Lab B
11 U 1.4 U
8.6 U 1.1 U
6.3 U 0.79 U
4.1 U 0.51 U
10 U 1.3 u
7.8 U 0.98 U
6.3 U 0.79 U
7.4 U 0.92 U
5.6 U 0.69 J
8.7 U 1.1 U
Date:
Owner/Resident Name:
Address:
Phone number:
Best Contact number:
Purpose of Meeting:
• •
Communication Data Sheet
FCX-Statesville Superfund Site OU3
Time:
Kim Haney (Owner)
601 Phoenix Street
704-202-7601
Discuss February 2008 Soil Gas & Groundwater Sampling Results
Documents left with owner/resident: ,/4/d... vJ/ dtttiL --4""--"""'-'--=-+, -"-"""-''-"""---------------
Documents shared but not left with owner/resident: NA
Content of Meeting: __,_-;3=-r ,_· c_·"'_,,1 A'"-[ izfA;Jl-=_,,1)"-'-':f,"'z1'---"},"''dt,=-"''"'··_<_/U/4<,==:..:I);;_--+/----'1'-''1'-"o'----'"s"'"C.J' 6it'-'-'i',c.s'e__,e.:e:·,,-'--~""e <e:,/_' _
1Zr7rJ C 1,&t-i'>--~e,it< &J
Action Items for Follow-up:
Return visit?
Additional information to be mailed?
Follow-up phone call?
Other?
Personnel Conducting Meeting:
P.ICllents\EI Paso\EPNG FCX\134301 -FCX Winter 2008 Vapor SampHng\001-002\Communica1ion Data Sheels\1539 Reid.xis 412712008
•
A elpaso
April 28, 2008
Ki111berly .I. Haney
c/o Kathy Sellers, Bentley Property Manage111ent, Inc.
616 N Main Street
Kannapolis, NC 28081
RE: 60 I Phoenix Street
•
l001 Louisi:uia Strei.:!
I louston. TX 77002
713-420-3827
FCX-Statesville Superfund Site Operable Unit 3, Statesville, NC (OU3 or site)
Dear Ms. Haney:
I a111 writing to follow up on the recent subsurface sa111pling that was perfor111ed as part of
a vapor intrusion evaluation at 60 I Phoenix Street. As you are aware, Brown and
Caldwell (BC), on behalf of El Paso Natural Gas Co111pany (EPNG), re-sa111pled the two
soil gas sa111pling points on the property on February 19, 2008. An additional soil gas
point was also installed and sa111pled during this ti111c_ The locations from which these
sa111plcs were taken are shown on the Sa111pling Location Map (attached).
These sa111ples were collected because there arc volatile organic compounds (VOCs) in
the groundwater under so111e properties in your area, including your property. The source
of the VOCs was explained in the letter EPNG sent to you on May 11, 2007. "Volatile"
111eans that VOCs can evaporate out of groundwater. Evaporated VOCs could 111ove
through the soil gas into buildings above the groundwater. "Soil vapor or soil gas" arc
ter111s used to describe the gas or vapor contained in the soil above the groundwater.
This letter presents information on the laboratory results of the soil gas and next steps
proposed by EPNG.
Results of the Soil Gas Sa111ples
The results from this sa111pling event indicate that soil gas sa111ples from your property
contained three of the ten VOCs identified as being present at the Fonner Burlington Plant
(now owned by EPNG) (referred to in this letter as "site related chemicals" or "site
related VOCs"). These three site related chemicals are tetrachloroethenc, (also called
perchloroethylene or PCE), methylene chloride, and chlorofonn; their concentrations are
shown on Table I along with the June 2007 results. The three detected VOCs, although
not detected in the June 2007 sampling event, were detected at very low concentrations.
EPNG believes that the concentrations arc within the range the United States
Ms. Haney
April 28, 2008
Page 2 of3
• •
Environmental Protection Agency (USEPA) will consider acceptable for soil gas below
homes at this site, as discussed in more detail in this section.
The USEPA screening levels arc established within a range of concentrations that have
been determined to be acceptable based on the potential for adverse health effects over a
lifetime, if one is exposed to that concentration for 30 years. USEPA uses this range to
determine if action is recommended to reduce potential exposure to the chemicals.
USEPA policy has determined that:
• For concentrations below the lowest acceptable concentration ( called the I o·6
level), the possibility of adverse health risks is extremely low or insignificant.
• For concentrations above the highest end of the range (called the 10·4 level),
action to reduce exposure or further investigation may be warranted.
• For concentrations within the I o·6 to I 04 range, action may not be warranted
depending on the level of confidence in the results e.g. a high level of
confidence allows a higher acceptable level.
The concentrations of PeE and methylene chloride are well below the I o·6 risk screening
level that USEPA considers acceptable indicating that the voes in soil gas do not pose a
concern to indoor air. The chloroform detection was slightly above the 10-6 risk
screening level but below the 10·5 risk screening level. The concentration of chloroform
in shallow soil gas is within the range for which further investigation may not be
warranted according to USEPA conservative risk screening levels. EPNG believes that
these concentrations are within the range that USEPA will consider acceptable for soil
gas below homes at this site.
Next Steps
We have now perforn1ed two sampling events on your property. These events were
purposely performed at different times of the year (summer and winter). The results from
these events show that the concentrations of voes in soil gas at your property arc
consistent and representative, despite changes in weather that can sometimes affect the
detected concentrations. The evidence indicates that the concentrations of voes in soil
gas pose little concern for human health in indoor air on your property. At this time, and
subject of course, to your agreement, we would like to keep the sampling points available
for future sampling. If we decide to undertake any additional sampling, we will contact
you again to explain what is being planned and why, and to request permission to enter
your property. Please be assured that when the sampling points are removed, the area
will be restored to its original condition. In the meantime, you should be receiving
regular Fact Sheets about site remediation activities to help keep you up to date on what
is happening.
Ms. Haney
April 28, 2008
Page 3 of 3
• •
Please feel free to contact me at 713-420-3425 if you would like any additional
information about the vapor intrusion evaluation process. As you know, EPNG is
working under the direction of US EPA. If you have any questions, please contact Ken
Mallary of USEPA at 404-562-8802 or Nile Testerman who is with the North Carolina
Department of Environment and Natural Resources (NCDENR) at 919-508-8482.
Sincerely,
/>_11.~'1 J r\M/Jo,
Brian S. Johnson
El Paso Natural Gas Company
cc: Janet McQuaid, EPNG
Jennifer Porter, Gurne Porter, PLLC
Ken Mallary, USEPA
Nile Testerman, NCDENR
Enclosure: Map of Sampling Locations and Tables 1 and 2
I L-.J
11 _____ 1_---.L_)__\__\ --------
E "' ~ 6 PHOENIX STREET
!
¼ I I
~ a,
"' ;;ti
~ ~
" z a. ~ g
t:.
!li ~
C ~ y
I
I '-----J·-1
LEGEND
1±) SHALLOW WELL LOCATION
601 PHOENIX
STREET
VP-07W Q
Q SEMI-PERMANENT SOIL GAS SAMPLE LOCATION
\_,--_J
(/
EB 9 W-21\
v -21 s
VP-01s)K
0
0
VP-07SW
□
40
SCALE
0 40
SAMPLE LOCATIONS FOR
601 PHOENIX STREET
FCX-STATESVILLE SUPERFUND SITE OU3
STATESVILLE, NORTH CAROLINA
80
FEET
134391.001.002 03/08
BROWN AND
CALDWELL Nashville, Tennessee a.._ ________________________ _. __________________ _
•
Volatile Organic
Compounds a
Table 1
Shallow Soil Gas Results
601 Phoenix Street
•
Units" Target Shallow Soil Gas ·
USEPA Screening Level'
Results
Low range High Range. Southwest ....
. . .. VP-07SW . . .. . .· .
Samele Date month/daV/vear 2/19/2008
Sample Interval ft/bos' . ·.·· -.. . . 5-7
Lab . ' ·'• . Lab B
T etrachloroethene (PCE) µg/m 3 .8.1 810 2.2 J1
.
Trichloroethene (TCE) µg/m 3 0.22 22 1.1 U
cis-1,2-Dichloroethene (cDCE) µg/m3 350 ' 350 ,. 0.79 U ..
Vinyl chloride µg/m3 . . 2.8 I 280 0.51 U
Carbon tetrachloride µg/m3 1.6 160 . 1.3 U · ..
Chloroform µg/m3 1.1 . 0 110 1.4 J
1, 1-Dichloroethene µg/m3 2,000 2,000 0.79 U
. · .
1,2-Dichloropropane µg/m3 40 40 0.92 U
Methylene chloride µg/m3 52 5,200 0.69 U . .
.
1, 1,2-Trichloroethane µg/m3 1.5 ' 150, ' 1.1 U
Footnotes:
'Site-related VOCs as listed in Table 2 of the September 2006 Explanation of Significant Difference (ESD)
for FCX Operable Unit 3 (OU3).
bUnits are in µg/m3 = micrograms per cubic meter
'USEPA Screening Level is from the Target Shallow Soil Gas Concentration Corresponding to Indoor Air Concentration
(soil gas to indoor air attenuation factor of 0.1) from Table 2c and 3a-SG (1x10·' risk is low range; 1x10·• is high range)
in the USEPA OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils
(Subsurtace Vapor Intrusion Guidance) (2002)
'Direction (i.e., north, east, west, south) refers to the direction the sample is located adjacent to house.
'Feet below ground surtace.
1 Laboratory data qualifiers are as follows:
U means that the VOC was not identified in the sample above the concentration reporting limit.
J means the the concentration was close to the reporting limit and is estimated.
The actual concentration could be slightly higher or lower.
• •
Volatile Organic
Compounds a
Unitsb
.
Table 2
Deep Soil Gas Results
601 Phoenix Street
· .
Target Deep Soil Gas
USEPA S~reenino Le~el c
Low range High Range . VP-07W
•
Results
601 Phoenix Street
Westu South
VP-07W VP-07S VP-07S
Samole Date monthlda"v/vear 6/2112007 2119/2008 6121/2007 211912008
Sample Interval ft/bQS8 10-12
Lab Lab A
Tetrachloroethene (PCE) µg/m3 405 40,500 11 u'
TrichJoroethene (TCE) µgfm3 11 · 1,100 8.6 U
"
cis-1,2-Dichloroethene (cDCE) µg/m3 17,500 1,750,000 6.3 U
Vinyl chloride µg/m3 140 14,000 4.1 U
Carbon tetrachloride µg/m3 80 ,8,000 10 U
'
Chloroform µg/m3 55 5,500 7.8 U
1, 1-0ichloroethene µg/mJ 100,000 10,000,000. 6.3 U
1,2-Dichloropropane µg/m3 2,000 200,000 7.4 U .
Methylene chloride µg/m3 2,600 260,000 5.6 U
1, 1,2-Trichloroethane µg/mJ 75 7,500 8.7 U
Footnotes:
aSite-related VOCs as listed in Table 2 of the September 2006 Explanation of Signific.ant Difference (ESD)
101 FCX Ope1able Unit 3 (OU3).
bUnits are in µg/m3 = micrograms per cubic meter
10-12
LabB
1.4 U
1.1 u
0.79 U
0.51 U
1.3 U
0.98 U
0.79 U
0.92 U
0.76 J
1.1 U
cUSEPA Screening Level is from the Target Deep Soil Gas Concentration Corresponding to Indoor Air Concentration
(soil gas to indoor air attenuation factor of 0.002) from Table 2c and 3a-SG (1x10-6 risk is low range: 1x10-4 is high range)
in the USE PA OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils
(Subsurface Vapor lntrusion Guidance) (2002)**The attenuation factor of 0.002 ls recommended for crawl spaces as
referenced by Department of Toxic Substances Control, California EPA Interim Final Guidance for the Evaluation and
Mitigation of Subsurface Vapor Intrusion to Indoor Air, Revised February 7, 2005.
dDirection (i.e., north, east, west, south) refers to the direction the sample is located adjacent to house.
eFeet below ground surface.
1 Laboratory data qualifiers are as follows:
U means that the VOC was not identified in the sample above the concentration reporting limit.
J means the the concentration was close to the reporting limit and is estimated.
The actual concentration could be slightly higher or lower.
6-8 6-8
Lab A Lab B
11 U 1.4 U
8.6 U 1.1 u
6.3 U 0.79 U
4.1 U 0.51 U
10 U 1.3 U
7.8 U 0.98 U
6.3 U 0.79 U
7.4 U 0.92 U
5.6 U 0.69 J
8.7 U 1.1 U
• • Communication Data Sheet
FCX-Statesville Superfund Site OU3
Date:
Owner/Resident Name:
Address:
Phone number:
Best Contact number:
Purpose of Meeting:
Time:
Mr. Matthews (Tenant)
509 Phoenix Street
Discuss February 2008 Soil Gas & Groundwater Sampling Results
Documents left with owner/resident:
Documents shared but not left with owner/resident:
Content of Meeting:
Action Items for Follow-up:
Return visit?
Additional information to be mailed?
Follow-up phone call?
Other?
Personnel Conducting Meeting:
P:IClientslEI PasalEPNG FCX\134391 -FCX Winter 2008 Vapor Sampling\001·002\Communication Data Sheets\Matthews.xls 4/27/2008
•
Date:
•
Communication Data Sheet
FCX-Statesville Superfund Site OU3
Time: I f/11 '
Owner/Resident Name: .cMc.:r.:.. . .:.T::;,mc..;.:K"-in"'n"'eyl..l.:(O:c.w:.cncce"'r'-) ____________________ _
Address: ,509 Phoenix.Streei71535 Reid Streel/1539 Reid Street
Phone number: ..:.7.::0..:.4·.,8.::8.::c0..:·2:.::2.::0.::.0 _______________________ _
Best Contact number:
Purpose of Meeting: Discuss February 2008 Soil Gas & Groundwater Sampling Results
Documents left with owner/resident:
Documents shared but not left with owner/resident: N-'Jv\'--'-'-"e..'-----------------
Content of Meeting:
I ,:· u,, ,,r ,
.., /1.i ·-I~ 'l
Return visit?
Additional information to be mailed?
Follow-up phone call?
Other?
/'"',I,. -I c,,1¥ h,
Personnel Conducting Meeting: ke c11:Jµ{ CAYtv'q,,,,).,'Vy\
P:\Clients\EI Paso\EPNG FCX\134391 -FCX Winter 2008 Vapor Sampling\001-002\CommunlCation Data Sheets\Kinney.x/s
' .
412712008
•
A elpaso
April 28, 2008 ·,
Mr, Talmadge M. Kinney
249 Abner Road
Stony Point, NC 28678
RE: 509 Phoenix Street, Statesville, NC
•
1001 l.titii.">iana Street
Hous1on, TX 7701)2
713-420-3827
FCX-Statesville Supcrl'und Site Operable Unit 3, Statesville, NC (OU3 cir site)
Dear Mr, Kinney:
I am writing to follow up on the recent subsurface sampling that was performed as part of
a vapor intrusion evaluation at 509 Phoenix Street, Statesville, NC, As you arc aware,
Brown and Caldwell (BC), on behalf of El Paso Natural Gas Company (EPNG) installed
3 semi-permanent soil gas vapor sampling points and l temporary groundwater sampling
point (piezometer) on the property on March 4, 2008. One groundwater sample and a
duplicate sample was collected from the piezomctcr on March 7, 2008 and on March 6,
2008, BC collected three soil gas samples from the soil gas points. The locations from
which these samples were taken arc shown on the Sampling Location Map (attached).
These samples were collected because there arc volatile organic compounds (VOCs) in
the groundwater under some properties in your area, including your property. The source
of the VOCs was explained in the letter EPNG sent to you on January 22, 2008.
"Volatile" means that VOCs can evaporate out of groundwater. Evaporated VOCs could
move through the soil gas into buildings above the groundwater. "Soil vapor or soil gas"
arc terms used to describe the gas or vapor contained in the soil above the groundwater.
This letter presents information on the laboratory results or the soil gas and groundwater
samples and next steps proposed by EPNG.
Results of the Soil Gas Samples
Soil gas samples from your properly contained five of the ten VOCs identified as being
present at the former Burlington Plant (now owned by EPNG) (referred to in this letter as
"site related chemicals" or "site related VOCs"). Five of these site related chemicals i.e.
letrachloroethene (also called perchloroethylene or PCE), trichlorocthene (also called
•
Mr. Talmadge M. Kinney
April 28, 2008
Page 2 of3
•
TCE), cis-1,2-dichloroethene (also called cDCE), methylene chloride, and I, 1,2-
trichloroethanc were detected in the shallow soil gas samples and their concentrations arc
shown on Table I. The shallow soil gas samples were collected from 5-7 feet below the
ground surface. Two of these site related chemicals were detected in the deep soil gas
sample: !'CE and methylene chloride. Their concentrations are shown on Table 2. Deep
soil gas samples arc collected from depths of more than 7 feet below ground surface; in
this instance, the deep soil gas sample was collected from I 0-12 feet below the ground
surface. EPNG believes that the concentrations arc within the range the United States
Environmental Protection Agency (USEPA) will consider acceptable for soil gas below
homes at this site, as discussed in more detail in this section.
The USEPA has established screening levels to evaluate whether concentrations of VOCs
in the soil gas are a potential concern for people living in houses above the soil gas.
Table I and Table 2 show the USEPA screening level and the sample result for each site
related VOC in soil gas at the three sampling points on your property for the respective
soil depth.
The USEPA screening levels are established within a range of concentrations that have
been determined to be acceptable based on the potential for adverse health effects over a
lifetime, if one is exposed to that concentration for 30 years. USEPA uses this range to
determine if action is recommended to reduce potential exposure to the chemicals.
USEPA policy has determined that:
• f'or concentrations below the lowest acceptable concentration ( called the I o·6
level), the possibility of adverse health risks is extremely low or insignificant.
For concentrations above the highest end of the range (called the I 0·4 level),
action to reduce exposure or further investigation may be warranted.
• For concentrations within the I o·6 to I 04 range, action may or may not be
warranted, depending on the level of confidence in the results e.g. a high level
of confidence allows a higher acceptable level.
The concentrations of PCE, cDCE, methylene chloride, and 1, 1 ,2-triehloroethane in
shallow soil gas arc below the I0'6 risk screening level that USEPA considers acceptable.
The PCE and methylene chloride detections in deep soil gas were also below the I o-6
screening levels that US EPA considers acceptable. The observed concentration of TCE
in shallow soil gas was above the I0.6 risk screening level, but below the J0-5 risk
screening level. The concentration of TCE in shallow soil gas is within the range for
which further investigation may not be warranted according to USEPA conservative risk
screening levels. EPNG believes that these concentrations are within the range that
USEPA will consider acceptable for soil gas below homes at this site.
•
Mr. Talmadge M. Kinney
April 28, 2008
Page 3 of3
Results of the Groundwater Sample
•
Table 3 shows the USEPA performance standard for each OU3 voe in groundwater and
the concentration of that substance at the sampling points on the property. PeE, TeE,
and cDeE were detected. Only PeE exceeds the USEPA performance standard. These
performance standards assume that the groundwater is used for drinking. As you arc
aware, there arc no groundwater wells at the site (except for the monitoring wells
installed by EPNG that arc not used for any other purpose), and the City of Statesville
supplies drinking water to the neighborhood. Consequently, there is no exposure to
voes from the groundwater.
Next Steps
On technical review, the data indicate that the concentrations of voes in soil gas pose
little concern for human health in indoor air on your property; however, to confirm that
the VOC results from this event are consistent and representative, we would like to
perform another round of sampling at your prope1ty, possibly in the summer months. We
would like to keep the sampling points available for this re-sampling. We will contact
you again when planning for this future sampling event is further advanced to explain
what we intend lo do and to request your concurrence. In the meantime, you should be
receiving regular Fact Sheets about site remediation activities to help keep you up to date
on what is happening.
Please feel free to contact me al 713-420-3425 if you would like any additional
information about the vapor intrusion evaluation process. As you know, EPNG is
working under the direction of USEPA. If you have any questions, please contact Ken
Mallary of USEPA at 404-562-8802 or Nile Testerman who is with the North Carolina
Department of Environment and Natural Resources (NCDENR) al 919-508-8482.
Sincerely,
Brian S. Johnson
El Paso Natural Gas Company
cc: Janet McQuaid, EPNG
Jennifer Porter, Gurne Porter, PLLC
Ken Mallary, USEPA
Nile Testerman, NCDENR
Enclosure: Map of Sampling Locations, Table I, Table 2, and Table 3
" m E 0
la.
E m ,-,.
<:'> 0
' ro 8 N .,;
N a <
~ ~
;i;
~ co z a.
!/j
" m a. w "in c .~ ~
•
I
/
\
□
LEGEND
():J SHALLOW WELL LOCATION
INTERMEDIATE WELL LOCATION
(', DEEP WELL LOCATION
/
PZ-05s
VP-05Ns f3
VP-05Nd
Q SEMI-PERMANENT SOIL GAS SAMPLE LOCATION
0 SEMI-PERMANENT PIEZOMETER LOCATION FOR
GROUNDWATER SAMPLE
Q GEOPROBE LOCATION FOR "GRAB" GROUNDWATER
SAMPLE (NOT PERMANENT POINT)
VP-OSEs
509 PHOENIX
STREET
40
•
PHOENIX STREET
I
0
I
---0-®-!
1
I
40 80
SCALE FEET
SAMPLE LOCATIONS FOR
509 PHOENIX STREET
FCX-STATESVILLE SUPERFUND SITE OU3
STATESVILLE, NORTH CAROLINA
134391.001.002 04/08
BROWN AND
CALDWEL,L Nnshville, Tennessee L-----------------'----------------'
•
Volatile Organic
Compounds'
Table 1
Shallow Soil Gas Results
509 Phoenix Street
Units•
•
1; ' · · · · · ·· ,, ,; • " a ·· e· East North 11-----~-------JI----+= =+-~v-=p="."'occsE=s-+-cv~p='."=o'=s"-N-s--11
316/2008 3/612008
5-7 5-7
Tetrachloroethene (PCE) 2.2 J'
Trichloroethene (TCE) µg/m3 1.9 J
cis-1,2-Dichloroethene (cDCE) µg/m3 1.3 J
Vinyl chloride µg/m3 0.51 U
Carbon tetrachloride µg/m3 1.3 U
Chloroform µg/m3 0.98 U
1, 1-Dichloroethene µglm3 0.79 U
1,2-Dichloropropane µg/m3 0.92 U
Methylene chloride µglm3 0.83 J
1, 1,2-Trichloroethane 1.3 J
Footnotes:
'Site-related VOCs as listed in Table 2 of the September 2006 Explanation of Significant Difference (ESD)
for FCX Operable Unit 3 (OU3).
'Units are in µglm3 = micrograms per cubic meter
2.7 J
1.1 U
0.79 U
0.51 U
1.3 U
0.98 U
0.79 U
0.92 U
0.69 U
1.1 J
'USEPA Screening Level is from the Target Shallow Gas Concentration Corresponding to Indoor N.r Concentration
(soil gas to indoor air attenuation factor of 0.002) from Table 2c and 3a-SG (1 x10'6 risk is low range; 1 x10'' is high range)
in the USEPA OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and &
(Subsurface Vapor Intrusion Guidance) (2002)"The attenuation factor of 0.002 is recommended for crawl spaces as
referenced by Department of Toxic Substances Control, California EPA Interim Final Guidance for the Evaluation and
Mitigation of Subsurface Vapor Intrusion to Indoor Air, Revised February 7, 2005.
'Direction (i.e., north, east, south, west) refers to the direction the sample is located adjacent to house.
' Feet below ground surface. ' . Laboratory data qualifiers are as follows:
U means that the VOC was not identified in the sample above the concentration reporting limit.
J means the the concentration was close to the reporting limit and is estimated.
The actual concentration could be slightly higher or lower.
Table 1 509 Phoenix Shallow SG
Volatile Organic
Compounds a
•
Table 2
Deep Soil Gas Results
509 Phoenix Street
•
Results
North
VP-05Nd du llcate
Sam le Date 3/6/2008 3/6/2008
Sam le Interval
Tetrachloroethene (PCE) µg/m3
Trichloroethene (TCE) µg/m3
cis-1,2-Dichloroethene (cDCE) µg/m3
Vinyl chloride µg/m3
Carbon tetrachloride µg/m3
Chloroform µg/m3
1, 1-Dichloroethene µg/m3
1,2-Dichloropropane µg/m3
Methylene chloride µg/m3
1, 1,2-Trichloroethane µg/m3
Footnotes:
'Site-related VOCs as listed in Table 2 of the September 2006 Explanation of Significant Difference (ESD)
for FCX Operable Unit 3 (OU3).
1,Unils are in µg/m3 = micrograms per cubic meter
10-12
4.8 J'
1.1 U
0.79 U
0.51 U
1.3 U
0.98 U
0.79 U
0.92 U
0.97 J
1.1 U
'USEPA Screening Level is from the Target Deep Soil Gas Concenlration Corresponding to Indoor Air Concentration
(soil gas to indoor air attenuation factor of 0.002) from Table 2c and 3a-SG (1x10'6 risk is low range; 1x10"4 is high range)
in the USEPA OSWER Oraft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils
(Subsurtace Vapor Intrusion Guidance) (2002)"The attenuation factor of 0.002 is recommended for crav. spaces as
referenced by Department of Toxic Substances Control, California EPA Interim Final Guidance for the Evaluation and
Mitigation of Subsurtace Vapor Intrusion to Indoor Air, Revised February 7, 2005.
'Direction (i.e., north, east, south, west) refers to the direction the sample is located adjacent to house.
cFeet below ground surface.
' Laboratory data qualifiers are as follows:
U means that the VOC was not identified in the sample above the concentration reporting limit.
J means !he the concentration was close to the reporting limit and is estimated.
The actual concentration could be slightly higher or lower .
. Table 1 509 Phoenix Deep SG
10-12
1.4 U
1.1 U
0.79 U
0.51 U
1.3 U
0.98 U
0.79 U
0.92 U
0.69 U
1.1 U
•
Volatile Organic
Table 3
Groudwater Sample Results
509 Phoenix Street
Groundwater
•
Results
Compounds• Units' Performance 509 Phoenix St
Standardsc North
PZ-05s PZ-05s Duplicate)
le Date 3/7/2008 3/7/2008
le Interval 25-30 25-30
Tetrachloroethene (PCE) 58 53
Trichloroethene (TCE) µg/L 2.0 J' 2.0 J
cis-1,2-Dichloroethene (cDCE) µg/L 1.0 J 1.0 J
Vinyl chloride µg/L 1.0 U 1.0 U
Carbon tetrachloride µg/L 1.0 U 1.0 U
Chloroform µg/L 0.8 U 0.8 U
1, 1-0ichloroethene µg/L 0.8.U 0.8 U
1,2-Dichloropropane µg/L 1.0 U 1.0 U
Methylene chloride µg/L 2.0 U 2.0 U
1, 1,2-Trichloroethane µg/L 0.8 U 0.8 U
Foolnotes:
'Site-related VOCs as listed in Table 2 of the September 2006 Explanation of Significant Difference (ESD)
for FCX Operable Unit 3 (OU3}.
'Units are in µg/L = micrograms per liter
'Groundwater Performance Standards for site-related VOCs are listed in Table 2 of the September 2006
ESD for FCX OU3.
'Direction (i.e., north, east, south, west) refers lo the direction lhe sample is located adjacent lo house.
'Feel below ground surtace
'Data qualifiers are as follows:
U means that the VOC was nol identified in the sample above the concentration reporting limit.
J means the the concentration was close to the reporting limit and is estimated.
The actual concentration could be slightly higher or lower.
Table 2 509 Phoenix Water
• •
Communication Data Sheet
FCX-Statesville Superfund Site OU3
Date: Time:
v' ✓
Owner/Resident Name: Ms. Brewer & Mr. Mayberry
Address: 506 Phoenix Street
Phone number: Ms. Brewer 704-878-0500 / 704-437-2317
Best Contact number:
Purpose of Meeting: Discuss February 2008 Soil Gas & Groundwater Sampling Results
Documents left with owner/resident:
D.2,cuments shared but not left with owner/resident: q-.p, .
C,Y-~J.J su/.'M. , f I
Content of Meeting:
Sc.,,ee.,,,,"'/ lvr./r,, neJtf .,;fe,ps -
jM k? /.'1( :1.. ' Of/id.. A.W
Action Items for Follow-up:
Return visit?
Additional information to be mailed?
Follow-up phone call?
Other?
412712008
.. •
A elpaso
April 28, 2008
Ms. Eunice Brewer
Michael's Gold Mine
865 North Center St.
Statesville, NC 28677
Mr. Michael K. Mayberry
506 Phoenix Street
Statesville, NC 28677
Re: 506 Phoenix Street
•
I 00 I I .ouislana S11 cc!
Houston, TX 77002
7 l.l-420•JM27
FCX-Statesville Supcrfund Site Operable Unit 3, Statesville, NC (OU3 or site)
Dear Ms. Brewer and Mr. Mayberry,
I am writing to follow up on the recent subsurface sampling that was performed as part of
a vapor intrusion evaluation at 506 Phoenix Street. As you arc aware, Brown and
Caldwell (BC), on behalf of El Paso Natural Gas Company (EPNG) was to install four semi-permanent soil gas points and one temporary groundwater sampling point
(piezometcr) on your property. These points were installed on February I I, 2008. In an
effort to avoid utilities, the piczometcr and one of the soil gas points were installed on an
adjacent property. Accordingly, the results from those two points are not included with
this letter. Only United States Environmental Protection Agency (lJSEPA)-approvcd
data can be provided to the public; therefore, once the results of the samples taken on the
adjacent property have been submitted, you will be able to access this data. On February
l 9, 2008 BC collected three soil gas samples from the soil gas points on your property.
The locations from which these samples were taken arc shown on the Sampling Location
Map (attached).
These samples were collected because there are volatile organic compounds (VOCs) in
the groundwater under houses in your area, including your house. The source of the
VOCs was explained in the letter EPNG sent to you on February 5, 2008. "Volatile"
means that VOCs can evaporate out of groundwater. Evaporated VOCs could move
through the soil gas into buildings above the groundwater. "Soil vapor or soil gas" arc
terms used to describe the gas or vapor contained in the soil above the groundwater.
This letter presents information on the laboratory results of the soil gas samples and next
steps proposed by EPNG.
•
Ms. Brewer & Mr. Mayberry
April 28, 2008
Page 2
Results of the Soil Gas Samples
•
Soil gas samples from your property contained three of the ten voes identified as being
present at the former Burlington Plant (now owned by El'NG) (referred to in this letter as
"site related chemicals" or "site related voes"). The three site related chemicals i.e.
tetrachloroethcne, (also called pcrchloroethylenc or PeE), chloroform, and methylene
chloride were detected within shallow soil gas samples and their concentrations arc
shown on Table I. "Shallow" soil gas samples arc collected from 5-7 feet below the
ground surface. EPNU believes that the concentrations are within the range the USE!';\
will consider acceptable for soil gas below homes at this site, as discussed in more detail
in this section.
The USEPA has established screening levels to evaluate whether concentrations ofVOes
in the soil gas are a potential concern for people living in houses above the soil gas.
Table I shows the USEPA screening level and the sample result for each site related
voe in soil gas at the three sampling points on your prope11y for respective soil depth ..
The USEPA screening levels are established within a range of concentrations that have
been determined to be acceptable based on the potential for adverse health effects over a
lifetime, if one is exposed to that concentration for 30 years. lJSEPA uses this range to
. determine if action is recommended to reduce potential exposure to the chemicals.
USEPA policy has determined that:
• For concentrations below the lowest acceptable concentration ( called the I o·6
level), the possibility of adverse health risks is extremely low or insignificant.
• For concentrations above the highest end of the range (called the 10·4 level),
action to reduce exposure or further investigation may be warranted.
For concentrations within the 10·<• to I 0·'1 range, action may not be warranted
depending on the level of confidence in the results e.g. a high level of
confidence allows a higher acceptable level.
The concentrations of methylene chloride are well below the 10·6 risk level that USEPJ\
considers acceptable. The concentrations of PeE are within• the 10·6 to 10·4 risk
screening range and the concentrations of chloroform were within the I 0'6 to Io·' range.
These concentrations are within the range for which further investigation may not be
warranted according to USEPA conservative risk screening levels. EPNG believes that
these concentrations are within the range that USEPA will consider acceptable for soil
gas below homes at this site.
Next Steps
On technical review, the data indicate that the concentrations of voes in soil gas pose
lit!le concern for human health in indoor air on your property; however, to confirm that
the voe results from this event at your property arc consistent and representative, we
•
Ms. Brewer & Mr. Mayberry
April 28, 2008
Page 3
•
would like to perfonn another round of sampling at your property, possibly in the
summer months. We would like to keep the sampling points available for this rc-
sampling. We will contact you again when planning for this future sampling event is
further advanced to explain what wc intend to do and to request your concurrence. In the
meantime, you should be receiving regular Fact Sheets about site remediation activities to
help keep you up _to dale on what is happening.
Please feel free to contact me at 713-420-3425 if you would like any additional
information about the vapor intrusion evaluation process. As you know, EPNG is
working under the direction of USEPJ\. If you have any questions, please contact Ken
Mallary of USEPA at 404-562-8802 or Nile Testerman who is with the North Carolina
Department of Environment and Natural Resources (NCDENR) at 919-508-8482.
Sincerely,
/J~A,~
Brian S. Johnson
El Paso Natural Gas Company
cc: Janet McQuaid, EPNG
Jennifer Porter, Gurne Porter, PLLC
Enclosure: Map of Sampling Locations and Table I
;;;
M ;,;
0 6 u.
~ w
0 g
~
ili 0
!& -~ u □ 0:
• •
---.)----®--
De
I □
(/)
a ili er .-------1;□
VP-03N
0
VP-03NH
506PHOENIX
STREET
0
VP-03W
17
LEGEND
SHALLOW WELL LOCATION
0 SEMI-PERMANENT SOIL GAS SAMPLE LOCATION
0 SEMI-PERMANENT PIEZOMETER LOCATION FOR
GROUNDWATER SAMPLE
PHOENIX STREET
40
SCALE
r----'1
0 40
SAMPLE LOCATIONS FOR
506 PHOENIX STREET
FCX-STATESVILLE SUPERFUND SITE OU3
STATESVILLE, NORTH CAROLINA
80
FEET
134391,001.002 04/08
BR01fi\TN AND
C..f:..._LD·1'VELL Nashville, 'fenn~siwo L....-----------------'--------------1
•
Table 1
Shallow Soil Gas Results
506 Phoenix Street
•
Results Volatile Organic
Compounds• Unitsb 506 Phoenix Street
West North
VP-03W
2/19/2008
5-7
Tetrachloroethene (PCE) µg/m3 4.6 JD'
Trichloroelhene (TCE) µg/m3 2.1 UD
cis-1,2-Dichloroelhene (cDCE) µg/m3 1.6 UD
Vinyl chloride 1.0 UD
Carbon tetrachloride µg/m3 2.5 UD
Chloroform µg/m3 2.0 UD
1, 1-Dichloroethene µg/m3 1.6 UD
1,2-Dichloropropane µg/m3 1.8 UD
Methylene chloride µg/m3 1.4 UD
1, 1,2-Trichloroethane µg/m3 2.2 UD
Footnotes:
'Site-related voes as listed in Table 2 of the September 2006 Explanation of Significant Difference (ESD)
for FCX Operable Unit 3 (OU3).
'Units are in µg/m3 = micrograms per cubic meter
VP-03NH
2/19/2008
5-7
130
1.1 U
0.79 U
0.51 U
1.3 U
3.5 J
0.79 U
0.92 U
1.0 J
1.1 U
'USEPA Screening Level is from the Target Shallow Soil Gas Concentration Corresponding to Indoor Air Concentration
(soil gas to indoor air attenuation factor of 0.1) from Table 2c and 3a-SG (1x1ff6 risk is tow range; 1 x1ff4 is high range)
in the USEPA OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils
(Subsurtace Vapor lnt,usion Guidance) (2002)
'Direction (i.e., north, east, south, west) refers to the direction the sample is localed adjacent to house.
'Feet below ground surtace.
1 Laboratory data qualifiers are as follows:
U means that the VOC was not identified in the sample above the concentration reporting limit.
J means the the concentration was close to the reporting limit and is estimated.
The actual concentration could be slightly higher or lower.
D means that the sample had high concentrations and was diluted for analysis
Table 1 506 Phoenix Shallow SG
VP-03N
2/19/2008
5-7
85
1.1 U
0.79 U
0.51 U
1.3 U
3.8 J
0.79 U
0.92 U
0.90 J
1.1 U
Date:
Owner/Resident Name:
Address:
Phone number:
Best Contact number:
Purpose of Meeting:
• •
Communication Data Sheet
FCX-Statesville Superfund Site OU3
Time: t)/3oa.,.
Mr. Nelson Jones·
214· Phoenix Street
336-655-5079
Discuss February 2008 Soil Gas & Groundwater Sampling Results
Documents left with owner/resident: _,_N.:..:A:..,..... _____________________ _
Documents shared but not left with owner/resident:
Content of Meeting: s~vJtr; 4$ ,OOS5;&lt-,5(JJ<(Ce ,.' Lil./ Pl,o,,,,,'y -4~7 S&ciJ<>'le.l ? ,' O-Vto'•.lf
v-t;,.lh tfh z,~ f1--.oe .. ~i ' iP,\JG twhs CMJ.,,.,,,1,,,.J;rM ·
N0.5ti r t!il-r, vk..... ' ,4,,k .. / 11 ,,,,J-, Ci re. , -lw bi '. -tf.;J
Action Items for Follow-up: f,n ~k /.: /J.i.,i {e p,,J-4' ~ tvJ. .J.,,fhi~/(1,,JdiVfYV
'
Return visit? ~ lf/:z'i/•t i'lt,~ ~@1>1,tvkf¼, 1-01 P~ ~fa u/J:J,'wf_ ~
Additional information to be mailed?,1\1\.. il{J)i~ 7 /..,..,-e (lad-z.1)/> l
. @ Chuk ~ .tt5b.tsl-~'> pJ.,J;;, 0,, g.,; 4, l,,.,;,: -
Follow-up phone call? ill ,w1,. ?
Other?
G) r9K. J... St.iA air CM j;,;vv,w-"-" /t?
Personnel Conducting Meeting:
P:\Clien1s\EI Paso\EPNG FCX\134391 • FCX Winter 2006 Vapor Snmpling\001--002\CommunicaHon Data Sheets\Brewer.xls 4/27/200B
• • Communication Data Sheet
FCX-Statesville Superfund Site OU3
Date: Time:
Owner/Resident Name: Tenant
Address: 1539 Reid Street
Phone number:
Best Contact number:
Purpose of Meeting: Discuss February 2008 Soil Gas & Groundwater Sampling Results
Documents left with owner/resident:
Documents shared but not left with owner/resident:
Content of Meeting:
Action Items for Follow-up:
Return visit?
Additional information to be mailed?
Follow-up phone call?
Other?
Personnel Conducting Meeting:
P:\Clients\EI Paso\EPNG FCX\134391 -FCX Winter 2008 Vapor Sampling\001-002\Communication Data.Sheets\1539 Reid.xis 4/27/2008
Date:
Owner/Resident Name:
Address:
Phone number:
Best Contact number:
Purpose of Meeting:
• •
Communication Data Sheet
FCX-Statesville Superfund Site OU3
Time:
Mr. Tim Kinney (Owner)
509 Phoenix Streeti1535 Reid Street/1539 Reid Street
704-880-2200
Discuss February 2008 Soil Gas & Groundwater Sampling Results
Documents left with owner/resident: .er-=· c_,_J_:.-1...::t:..,Ys:....Llb..!.L.::,-lc.::••:,:l.i..;/•_fp/ •O'f,fi:>.':../''fl<'-"'---------------
Documents shared but not left with owner/resident: N_,Jv\=..::e..:...._ _______________ _
Content of Meeting: /\~, -r,, '",'t ,J Bl 0 t;.;~,,,, f I, /J:1 ,Jo /lw.vvf
1',1/C --t✓;J1, />-1,·i · Yh.l kw,{;',, . .;-,.,,.,_.,,, C'
Return visit?
Additional information to be mailed?
Follow-up phone call?
Other?
'ftA·/J/{, h, :S~,;j-IA 0/M/r ::f,: / k /\~ /:o ~:;(; J-~ r;b Ju,41-",/:,
Personnel Conducting Meeting:
I<,, c 11,Jµ,{ C/41 v' t\-> ,J,' (Jy\
P;\Clients\EI Paso\EPNG FCX\134391 -FCX Winier 2008 Vapor Samplin[l\001-002\Communication Data Shee1s\K1nney.xls 4/2712008
•
A elpaso
April 28, 2008
Mr. Talmadge M. Kinney
249 Abner Road
Stony Point, NC 28678
RE: 1539 Reid Street, Statesville, NC
•
1001 l .ouisiana St reel
l!ouswn, TX 77002
713-420-3827
FCX-Statesville Superfund Site Operable Unit 3, Statesville, NC (OU3 or site)
Dear Mr. Kinney:
1 am writing to follow up on the recent subsurface sampling that was performed as part of
a vapor intrusion evaluation at 1539 Reid Street, Statesville, NC. As you are aware,
Brown and Caldwell (BC), on behalf of El Paso Natural Gas Company (EPNG installed
four semi-permanent soil gas vapor points and two temporary groundwater sampling
points (piezometers) on the property on February 11 and March 5, 2008. Two
groundwater samples were collected on February 19 and March 7, 2008. On Fcbru,try 16
and March 6, 2008 BC collected four soil gas samples from the soil gas points. The
locations from which these samples were taken are shown on the Sampling Location Map
(al!ached). '
These samples were collected because there are volatile organic compounds (VOCs) in
the groundwater under the houses in your area, including your property. The source of
the VOCs was explained in the letter EPNG sent to you on January 22, 2008. "Volatile"
means that VOCs can evaporate out of groundwater. Evaporated VOCs could move
through the soil gas into buildings above the groundwater. "Soil vapor or soil gas" are
terms used to describe the gas or vapor contained in the soil above the groundwater.
This letter presents information on the laboratory results of the soil vapor and
groundwater samples and next steps proposed by EPNG.
Results of the Soil Gas Samples
Soil gas samples from your property contained six of the ten VOCs identified as being
present at the former Burlington Plant (now owned by EPNG) (referred to in this letter as
"site related chemicals" or "site related VOCs"). Four of these site related chemicals i.e.
tetrachloroethene (also called pcrchloroethylene or "PCE"), trichlorocthene (also called
•
Ms. Talmadge M Kinney
April 28, 2008
Pagc2of3
•
TCE), methylene chloride, and 1, 1,2-trichloroethane were detected within shallow soil
gas vapor samples and their concentrations are shown on Table I. "Shallow" soil gas
results refer to samples collected from 5-7 feet below the ground surface. Six of these
site related chemicals detected within the deep soil gas sample arc PCE, TCE, and cis-
1,2-dichlorocthenc (also called cDCE), chloroform, methylene chloride, and 1, 1,2-
trichloroethane and their concentrations are shown on Table 2. "Deep" soil gas results
refer to soil gas samples collected from greater than 7 feet below ground surface, in this
case a "deep" soil gas sample was collected from 11-21 feet below the ground surface.
EPNG believes that the concentrations are within the range the United States
Environmental Protection Agency (USE!' A) will consider acceptable for soil gas below
homes at this site, as discussed in more detail in this section.
The USEPA has established screening levels to evaluate whether concentrations ofVOCs
in the soil gas are a potential concern for people living in houses above the soil gas.
Table I and Table 2 show the USEPA screening level and the sample result for each site
related VOC in soil gas at the sampling points on your property for respective soil depth.
The USEPA screening levels arc established within a range of concentrations that have
been determined to be acceptable based on the potential for adverse health effects over a
lifetime, if one is exposed to that concentration for 30 years. USEPA uses this range to
determine if action is recommended to reduce potential exposure to the chemicals.
USEPA policy has determined that:
• For concentrations below the lowest acceptable concentration ( called the Io-"
level), the possibility of adverse health risks is extremely low or insignificant.
For concentrations above the highest end of the range (called the 10-4 level),
action to reduce exposure or further investigation may be warranted.
• For concentrations within the I0-6 to 10-4 range, action may not be warranted
depending on the level of confidence in the results e.g. a high level of
confidence allows a higher acceptable level.
The concentrations of PCE, cDCE, chloroform, methylene chloride and 1, 1,2-
ti'ichloroethane in shallow and deep soil gas are below the I0-6 level that USEPA
considers acceptable. The concentration of TCE in the shallow "South" sample point was
slightly above the 10-5 risk screening level but below the 10-4 risk screening level. The
conce11tration of TCE in shallow soil gas is within the range for which further
investigation may not be warranted according to USEPA conservative risk screening
levels. EPNG believes that these concentrations arc within the range that USEPA will
consider acceptable for soil gas below homes al this site.
•
Ms. Talmadge M Kinney
April 28, 2008
Page 3 of3
Results of the Groundwater Sample
•
Only one VOC, PCE, was detected in groundwater. Table 3 shows the USEPA
performance standard for each VOC detected in groundwater for OU3 and the
concentration of that substance at the sampling points on the property. These
performance standards assume that the groundwater is used for drinking. As you are
aware, there are no groundwater wells at the site (except for the monitoring wells that are
not used for any other purpose), and the City of Statesville supplies drinking water to the
neighborhood. Consequently, there is no exposure to VOCs from the groundwater.
Next Steps
On technical review, the data indicate that the concentrations of VOCs in soil gas pose
little concern for human health in indoor air on your property; however, to confirm that
the VOC results from this event are consistent and representative, we would like to
perform another round of sampling at your property, possibly in the summer months. We
would like to keep the sampling points available for this re-sampling. We will• contact
you again when planning for this future sampling event is further advanced to explain
what we intend to do and to request your concurrence. In the meantime, you should be
receiving regular Fact Sheets about site remediation activities to help keep you up to date
on what is happening.
Please feel free to contact me at 7 I 3-420-3425 if you would like any additional
information about the vapor intrusion evaluation process. As you know, EPNG is
working under the direction of USEP A. If you have any questions, please contact Ken
Mallary of USEPA at 404-562-8802 or Nile Testerman who is with the North Carolina
Department of Environment and Natural Resources (NCDENR) al 919-508-8482.
Sincerely,
Brian S. Johnson
El Paso Natural Gas Company
cc: Janet McQuaid, EPNG
Jennifer Porter, Gurne Porter, PLLC
Ken Mallary, USEPA
Nile Testerman, NCDENR
Enclosure: Map of Sampling Locations, Table 1, Table 2, and Table 3
~
ill :,;
~
"' z "-
J
i .~ ~
J
tu w
•
VP-21Ed
1539 REID
STREET
f!: UJ
Cl w Cl'.
PZ-03s(iJJ .VP-03Ed
LEGEND
SHALLOW WELL LOCATION
INTERMEDIATE WELL LOCATIDN
DEEP WELL LOCATION
Q SEMI-PERMANENT SOIL GAS SAMPLE LOCATION
Q SEMI-PERMANENT PIEZOMETER LOCATION FOR
GROUNDWATER SAMPLE
0 GEOPROBE LOCATION FOR "GRAB" GROUNDWATER
SAMPLE (NOT PERMANENT POINT)
VP-21Ss
40
SCALE
•
........... :'
I
□
□
0 40
SAMPLE LOCATIONS FOR
1539 REID STREET
FCX-STATESVILLE SUPERFUND SITE OU3
STATESVILLE, NORTH CAROLINA
80
FEET
134391.001.002 03/08
BROWN AND
CALDWELL Nashv!lle, Tonnessee ""'----------------------------------------'
•
Table 1
Shallow Soil Gas Results
1539 Reid Street
•
Volatile Organic
Compounds'
Results
1539 Reid Street
East
VP-21Es
mon 3/6/2008
ftlb 5-7
Tetrachloroethene (PCE) 1.8 Jr
Trichloroethene (TCE) µg/m3 1.1 U
cis-1,2-Dichloroethene (cDCE) µg/m3 0.79 U
Vinyl chloride µg/m3 0.51 U
Carbon tetrachloride µg/m 3 1.3 U
Chloroform µg/m3 0.98 U
1, 1-Dichloroethene µg/m3 0.79 U
1,2-Dichloropropane µg/m3 0.92 U
Methylene chloride µg/m3 0.76 J
1, 1,2-Trichloroethane µg/m3 1.1 U
Footnotes:
'Sile-related VOCs as listed in Table 2 ol the September 2006 Explanation of Significanl Difference (ESD) for
FCX Operable Unit 3 (OU3).
0Units are in µg/m:1 = micrograms per cubic meter
cUSEPA Screening Level is from the Target Shallow Gas Concentration Corresponding to Indoor Air Concentration
(soil gas to indoor air attenuation factor of 0.1) from Table 2c and 3a-SG ('ix10'' risk is low range; 1x10'' is high range)
South
VP-21Ss
3/6/2008
5-7
2.4 J
2.3 J
0.79 U
0.51 U
1.3 U
0.98 U
0.79 U
0.92 U
2.6 J
1.2 J
in the USEPA OSWER Draft Guidance for Evalualing lhe Vapor Intrusion to Indoor Air Palhway from Groundwater and Soils
(Subsurtace Vapor Intrusion Guidance) (2002)
aDireclion (i.e., north, east, south, west) refers to the direction the sample is located adjacent to house.
eFeet below gr0tmd surface.
1 Laboratory data qualifiers are as follows:
J means the the concen!ratlon was close to lhe reporting limit and is estimated.
The actual concentration could be slightly higher or lower.
U means that the VOC was not identified in the sample above 1he concentration reporting limit.
Table 1 1539 Reid Shallow SG
•
Table 2
Deep Soil Gas Results
1539 Reid Street
•
'::-".::·•,-·· :·~:i8<~: .. :..:·. ,s~.:· _._,.:l">,: · '-1•\)::'/1•:?-<F·\ Volatile Organic
Compounds 8 Units' Results ~j ;~i~~rl~~f f ~~~~~~~~i:~tf (~~j),_ __ ~
Tetrachloroethene (PCE)
Trichloroethene (TCE) µg/m3
cis-1,2-Dichloroethene (cDCE) µg/m3
Vinyl chloride µglm3
Carbon tetrachloride µglm3
Chloroform µglm3
1, 1-Dichloroethene
1,2-Dichloropropane µglm3
Methylene chloride µglm3
1, 1,2-Trichloroethane µglm3
Footnotes:
'Site-related VOCs as listed in Table 2 of the September 2006 Explanation of Significant Difference
(ESD) fot FCX Operable Unit 3 (OU3).
'Units are in µglm3 = micrograms per cubic meler
West
VP-03Ed
2/16/2008
19-21
84
1.1 u'
0.79 U
0.51 U
1.3 U
1.2 J
0.79 U
0.92 U
1.5 J
1.1 U
'USEPA Screening Level is from the Target Deep Soil Gas Concentration Corresponding to Indoor Air Concentration
(soil gas to indoor air attenuation factor of 0.002) from Table 2c and 3a-SG (1x10"6 risk is low range; 1,10·• is high range)
in the USEPA OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils
(Subsurtace Vapor Intrusion Guidance) (2002)"The attenualion factor of 0.002 is recommended for crawl spaces as
referenced by Department of Toxic Substances Control, California EPA Interim Final Guidance for the Evaluation and
Mitigation of Subsurtace Vapor Intrusion to Indoor Air, Revised February 7, 2005.
'Direction (i.e., north, east, south, west) refers to the direction the sample is located adjacent to house.
'Feet below ground surtace.
' Laboratory data qualifiers are as follows:
D means that the sample had high concentrations and was diluted for analysis
J means the the concentration was close to the reporting limit and is estimated.
The aclual concentration could be slightly higher or lower.
U means !hat Jhe VOC was not identified in the sample above the concentration reporting limit.
Table 1 1539 Reid Deep SG
East
VP-21Ed
3/6/2008
11-13
61
11
3.4 J'
0.51 U
1.3 U
2.1 J
0.79 U
0.92 U
2.8 J
2,6 J
•
Volatile Organic
Compounds•
Table 3
Groundwater Sample Results
1539 Reid Street
Units• Groundwater
•
Results
Pc-riormance
Standardsc 1539 Reid Street
PZ-03s PZ-21s PZ-03s (Duplicate)
Sam le Date 3/7/2008 2/19/2008
Sam le Interval 25-30 30-35
Tetrachloroethene (PCE) µg/L 3.0 J' 1.7 J'
Trichloroethene (TCE) µg/L 1.0 U 0.5 U
cis-1,2-Dichloroethene (cDCE) µg/L 0.8 U 0.8 U
Vinyl chloride µg/L 1.0 U 0.5 U
Carbon tetrachloride µg/L 1.0 U 0.5 U
Chloroform µg/L 0.8 U 0.8 U
1, 1-Dichloroethene . µg/L 0.8 U 0.8 U
1,2-Dichloropropane µg/L 1.0 U 0.5 U
Methylene chloride µg/L 2.0 U 2.0 U
1, 1,2-Trichloroethane µg/L 0.8 U 0.8 U
Footnotes:
'Site-related voes as listed in Table 2 of the September 2006 Explanation of Significant Difference (ESD)
for FeX Operable Unit 3 (OU3).
'Units are in µg/L = micrograms per liter
'Groundwater Performance Standards for site-related voes are listed in Table 2 of the September 2006
ESD for FeX OU3.
'Feel below ground surface
e Data qualifiers are as follows:
U means that the voe was not identified in the sample above the concentration reporting limit.
J means the the concentration was close to the reporting limit and is estimated.
The actual concentration could be slightly higher or lower.
Table 2 1539 Reid St GW
2/19/2008
30-35
2.3
0.1 U
0.8 U
0.1 U
0.1 U
0.8 U
0.8 U
0.1 U
2.0 U
0.8 U
• •
Communication Data Sheet
FCX-Statesville Superfund Site OU3
Date: Time:
Owner/Resident Name: Johna Myers (Tenant)
Address: 1535 Reid Street
Phone number: 704-873-7640
Best Contact number:
Purpose of Meeting: Discuss February 2008 Soil Gas & Groundwater Sampling Results
Documents left with owner/resident:
Documents shared but not left with owner/resident:
Content of Meeting:
Action Items for Follow-up:
Return visit?
Additional information to be mailed?
Follow-up phone call?
Other?
Personnel Conducting Meeting:
P:\CH~nts\El Paso\EPNG FCX\134391 -FCX Winter 2008 Vapor Sampling\001-002\Communication Data Sheets\Myers.xts 4/27/2008
•
Date:
•
Communication Data Sheet
FCX-Statesville Superfund Site OU3
Time:
Owner/Resident Name: .!.M'.!!r-'-. .!.T!!cim"-"K"-ine,n::.eYL.1.0(O:<ew,cnc,;ee,rL) ____________________ _
Address: ,509 Phoenix StreeV1535 Reid Street/1539 Reid Street
Phone number: .,.7_,,0::,:4-::c8~8c,:c0_,-2:.e2ce0c,:c0 _______________________ _
Best Contact number:
Purpose of Meeting: Discuss February 2008 Soil Gas & Groundwater Sampling Results
Documents shared but not left with owner/resident: N JY\ e. -------------------
Content of Meeting:
Return visit?
Additional informafton to be mailed?
Follow-up phone call?
Other?
..,----I, . ' it,, /irv Iv
Personnel Conducting Meeting:
t<e cll-M C-111vq5,,J-:~
P;IC/ients\EI Paso\EPNG FCX\134391 -FCX Winter 2008 Vapor SampJing\001·002\Communicatlon Data SheetslJ<inney.~ls 4/27/2008
•
A elpaso
April 28, 2008
Mr. Talmadge M. Kinney
249 Abner Road
Stony Point, NC 28678
RE: 1535 Reid Street, Statesville, NC
•
I 00 I Louisimia SL reel
!-1011~lon. TX 77002
713-420•3827
FCX-Statcsville Supcrfund Site Operable Unit 3, Statesville, NC (OU3 or Site)
_,....___
Dear M .nney:
I am writing lo follow up on the recent subsurface sampling that was performed as part of
a vapor intrusion evaluation at 1535 Reid Street, Statesville, NC. As you arc aware,
Brown and Caldwell (BC), on behalf of El Paso Natural Gas Company (EPNG installed
three semi-permanent soil gas sampling points and one temporary groundwater sampling
point (piezometcr) on the property on March 5, 2008. One groundwater sample was
collected on March 7. 2008 from the piczometer and on March 6, 2008 BC collected
three soil gas samples from the soil gas sampling points. The locations from which these
samples were taken are shown on the Sampling Location Map (attached).
These samples were collected because there are volatile organic compounds (VOCs) in
the groundwater under the properties in your area. The source of the VOCs was
explained in the letter EPNG sent to you on February 25, 2008. "Volatile" means that
VOCs can evaporate out of groundwater. Evaporated VOCs could move through the soil
gas into buildings above the groundwater. "Soil vapor or soil gas" are terms used to
describe the gas or vapor contained in the soil above the groundwater.
This letter presents information on the laboratory results of the soil vapor and
groundwater samples and next steps proposed by EPNG.
Results of the Soil Gas Samples
Soil gas samples from your property contained five of the ten VOCs identified as being
present at the former Burlington Plant (now owned by EPNG) (referred to in this letter as
"site related chemicals" or "site related VOCs"). Four of these site related chemicals i.e.
tetrachloroethcne, (also called perchloroethylene or PCE), chloroform, methylene
chloride, and l, 1,2-trichloroethane were detected within shallow soil gas samples and
their concentrations arc shown on Table 1. "Shallow" soil gas results refer to samples
•
Mr. Talmadge M. Kinney
April 28, 2008
Page 2 of3
•
collected from 5-7 feet below the ground surface. Three of these site related chemicals
detected within the deep soil gas sample arc PCE, trichloroethenc (also called TCE), and
methylene chloride. Their concentrations are shown on Table 2. "Deep" soil gas results
refer to soil gas samples collected from greater than 7 feet below ground surface, in this
case a "deep" soil gas sample was collected from 16-18 feet below the ground surface.
EPNG believes that the concentrations are within the range the United States
Environmental Protection Agency (USEPA) will consider acceptable for soil gas below
homes at this site, as discussed in more detail in this section.
The USEPJ\ has established screening levels to evaluate whether concentrations ofVOCs
in the soil gas are a potential concern for people living in houses above the soil gas.
Table 1 and Table 2 show the USEPA screening level and the sample result for each site
related VOC in soil gas at the three sampling points on your property for respective soil
depth.
The USEP A screening levels are established within a range of concentrations that have
been determined to be acceptable based on the potential for adverse health effects over a
lifetime, if one is exposed to that concentration for 30 years. USEP A uses this range to
determine if action is recommended to reduce potential exposure to the chemicals.
USEPA policy has determined that:
• For concentrations below the lowest acceptable concentration (called the 10·6
level), the possibility of adverse health risks is extremely low or insignificant.
• For concentrations above the highest end of the range (called the I 0-4 level),
action to reduce exposure or further investigation may be warranted.
For concentrations within the 10-6 to I 0-4 range, action may not be warranted
depending on the level of confidence in the results e.g. a high level or
confidence allows a higher acceptable level.
The concentrations of PCE and I, 1,2-trichloroethcnc in shallow soil gas were above the
10·6 risk screening level; however, they were below the 10-5 risk screening level. The
concentrations of chloroform and methylene chloride in shallow soil gas were below the
I o-6 risk screening level. The concentrations of !'CE, TCE, and methylene chloride in
deep soil gas samples are below the 10·6 level that USEPA considers acceptable. The
concentrations of !'CE and I, 1,2-trichloroethene in shallow soil gas are within the range
for which further investigation may not be warranted according to USEP i\ conservative
risk screening levels. EPNG believes that these concentrations are within the range that
USEPA will consider acceptable for soil gas below homes at this site.
•
Mr. Talmadge M. Kinney
April 28, 2008
Page 3 of3
Results of the Groundwater Sample
•
There were no OU3 VOC detections in groundwater above respective screening levels.
Table 3 shows the USEPA performance standard for each VOC detected in groundwater
for OU3 and the concentration of that substance at the sampling points on the properly.
These performance standards assume that the groundwater is used for drinking. As you
are aware, there are no groundwater wells at the site ( except for the piezomctcr that is not
used for any other purpose), and the City of Statesville supplies drinking water to the
neighborhood. Consequently, there is no exposure to VOCs from the groundwater.
Next Steps
On technical review, the data indicate that the concentrations of VOCs in soil gas pose
little concern for human health in indoor air on your property; however, to confirm that
the VOC results from this event arc consistent and representative, we would like lo
perform another round of sampling at your properly, possibly in the summer months. We
would like to keep the sampling points available for this re-sampling. We will contact
you again when planning for this future sampling event is fu,ther advanced to explain
what we intend to do and to request your concurrence. In the meantime, you should be
receiving regular Fact Sheets about site remediation activities to help keep you up to date
on what is happening.
Please feel free to contact me at 713-420-3425 if you would like any additional
infmmation about the vapor intrusion evaluation process. As you know, EPNG is
working under the direction of USEPA. If you have any questions, please contact Ken
Mallary of USEPA at 404-562-8802 or Nile Testerman who is with the North Carolina
Depm1ment of Environment and Natural Resources (NCDENR) at 919-508-8482.
Sincerely,
13rian S. Johnson
El Paso Natural Gas Company
cc: Janet McQuaid, EPNG
Jennifer Porter, Gurne Porter, l'LLC
Ken Mallary, USEPA
Nile Testerman, NCDENR
Enclosure: Map of Sampling Locations, Table I, Table 2, and Table 3
• m E 0 ~ ""'
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LEGEND
1-UJ gJ
1-
(/)
Cl ijj a:
':';i SHALLOW WELL LOCATION
• INTERMEDIATE WELL LOCATION
DEEP WELL LOCATION
0 SEMI-PERMANENT SOIL GAS SAMPLE LOCATION
0 SEMI-PERMANENT PIEZOMETER LOCATION FOR GROUNDWATER SAMPLE
0 GEOPROBE LOCATION FDR "GRAB" GROUNDWATIER SAMPLE (NOT PERMANENT POINT)
40
SCALE
•
___ }---®--
0
□
'
1 :
' '
0 40
SAMPLE LOCATIONS FOR
1535 REID STREET
FCX-STATESVlllE SUPERFUND SITE OU3
STATESVILLE, NORTH CAROLINA
' '
' ' !
80
FEET
134391.001.002 03/08
BROWN AND
CALDWEJ....,L Nashville, Tennessee
•
Table 1
Shallow Soil Gas Results
1535 Reid Street
•
Volatile Organic
Compounds'
Results
1535 Reid Street
South
;:;1.:c,w,Rarige,; (lHigh>Range' VP-22S
month/da I eafl{/()'\i{if\' 3/612008
5-7
Tetrachloroethene (PCE) 22
Trichloroethene (TCE) µg/m 3 1.1 u'
cis-1,2-Dichloroethene (cDCE) µglm' 0,79 U
Vinyl chloride µglm3 0,51 U
Carbon tetrachloride µglm3 1.3 U
Chloroform 0,98 U
1, 1-Dichloroethene 0.79 U
1,2-Dichloropropane µg/m 3 0.92 U
Methylene chloride µglm3 1.5 J
1, 1 ,2-Trichloroethane µglm3 3.1 J
Foolnoles:
'Sile-relaled VOCs as lisled in Table 2 of the Seplember 2006 Explanalion of Significanl Difference (ESD) for
FCX Operable Unil 3 (OU3).
0unils are in µg/m3 = micrograms per cubic meter
East
VP-22Es
31612008
5-7
8,6
uu
0.79 U
0,51 U
1.3 U
0,98 J
0.79 U
0.92 U
11
1,5 J
'USEPA Screening Level is from the Target Shallow Soil Gas Concentration Corresponding to Indoor Air Concenlration
(soil gas to indoor air attenuation factor of 0.1) from Table 2c and 3a-SG ( 1 x1 o·' risk is low range; 1 x10'4 is high range)
in lhe USEPA OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Palhway from Groundwater and Soils
(Subsurface Vapor Intrusion Guidance) (2002)
'Direction (i.e., north, east, south, west) refers to the direction the sample is located adjacent to house.
' Feet below ground surface.
1 Laboratory data qualifiers are as follows:
J means the the concentration was close lo the reporting limit and is estimated.
The actual concentration could be slightly higher or lower.
U means that the VOC was not identified in the sample above the concentration reporting limit.
Table 1 1535 Reid Shallow SG
•
Volatile Organic
Compounds'
Sam le Date
Sam le Interval
Tetrachloroethene (PCE)
Trichloroethene (TCE)
cis-1,2-Dichloroethene (cDCE)
Vinyl chloride
Carbon tetrachloride
Chloroform
1, 1-Dichloroethene
1,2-Dichloropropane
Methylene chloride
1, 1,2-Trichloroethane
Footnotes:
Table 2
Deep Soil Gas Results
1535 Reid Street
Units'
µg/m3
µg/m3
µg/m3
µg/m3
µg/m3
µg/m3
µg/m3
µg/m3
µg/m3
µg/m3
•
'Site-related VOCs as listed in Table 2 of the September 2006 Explanation of Significant Ditte,ence (ESD) for
FCX Operable Unit 3 (OU3).
'units are in µg/m3 = micrograms per cubic meler
Results
VP-22Ed
3/6/2008
16-18
12
6.1
o.79 u'
0.51 U
1.3 U
0.98 U
0.79 U
0.92 U
2.2 J
1.1 U
'USEPA Screening Level is from the Target Deep Soil Gas Concentration Corresponding to Indoor Air Concent,ation
(soil gas to indoor air attenuation factor of 0.002) from Table 2c and 3a-SG (1x1□·' risk is low range; 1x10' is high range)
in the USEPA OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils
(Subsurface Vapor Intrusion Guidance) (2002)"The attenuation factor of 0.002 is recommended for crawl spaces as
referenced by Department of Toxic Substances Control, California EPA Interim Final Guidance for the Evaluation and
Mitigation of Subsurface VapOf Intrusion to Indoor Air, Revised February 7, 2005.
'Direction (i.e., north, east, south, west) refers to the direction the sample is located adjacent to house.
' Feet below ground surface.
'Labora!Ofy data qualifie,s are as follows:
J means the the concentration was close to the repo,ting limit and is estimated.
The actual concentration could be slightly higher or lower.
U means that the VOC was not identified in the sample above the concentration reporting limit.
Table 1 1535 Reid Deep SG
•
Table 3
Groundwater Sample Results
1535 Reid Street
Volatile Organic Groundwater
Compounds' Units' Performance
Standards'
Sam le Date
Sam le Interval
Tetrachloroethene (PCE) µg/L
Trichloroethene (TCE) µg/L
cis-1,2-Dichloroethene (cDCE) µg/L
Vinyl chloride µg/L
Carbon tetrachloride µg/L
Chloroform µg/L
1, 1-Dichloroethene µg/L
1,2-Dichloropropane µg/L
Methylene chloride µg/L
1, 1,2-Trichloroethane µg/L
Foolnoles:
•
Results
1535 Reid
Street
PZ-22s
3/7/2008
25-30
0.8 U'
1.0 U
0.8 U
1.0 U
1.0 U
0.8 U
0.8 U
1.0 U
2.0 U
0.8 U
'Sile-relaled VOCs as listed in Table 2 of lhe September 2006 Explanalion of Significanl Difference (ESD) for FCX Operable Unit 3 (OU3).
'Units are in µg/L = micrograms per liter
'Groundwater Pertormance Standards for site-related VOCs are listed in Table 2 of the September 2006
ESD for FCX OU3.
'Feet below ground surtace
• Data qualifiers are as follows:
U means lhat lhe VOC was not identified in the sample above the concentralion reporting limit.
Table 2 1535 Reid St GW
• •
Communication Data Sheet
FCX-Statesville Superfund Site OU3
Date: Time:
Owner/Resident Name: Mr. & Mrs. Derr
Address: 1633 W. Front Street
Phone number: 704-872-7780
Best Contact number:
Purpose of Meeting: Discuss February 2008 Soil Gas & Groundwater Sampling Results
Documents left with owner/resident:
Documents shared but not left with owner/resident:
Action Items for Follow-up:
Return visit?
Additional information to be mailed?
Follow-up phone call?
Other?
Personnel Conducting Meeting:
P:1Clmn1s\EI Paso\EPNG FCX\134391 • FCX Winter 2008 Vapor Sampling\001-002\Communication Data Sheetsl.A.lan Plasky.xis 4/2712008
•
A elpaso
April 28, 2008
Mrs. Mary Rankin Derr
1633 W. Front Street
Statesville, NC 28677
RE: 1633 West Front Street
•
1001 l.ouisiarrn S\rccl
/fou~(on, TX 77002
71)-420-1827
FCX-Statesville Supcrfund Site Operable Unit 3, Statesville, NC (OU3 or site)
Dear Mrs. Rankin Derr:
I am writing to follow up on the recent subsurface sampling that was performed as part 01·
a vapor intrusion evaluation at I 633 West Front Street. As you are aware, Brown and
Caldwell (BC), on behalf of El Paso Natural Gas Company (EPNG), re-sampled the two
soil gas sampling points on the property on February 18 and 19, 2008. They also
installed an additional soil gas sampling point during this time. The locations from which
these samples were taken are shown on the Sampling Location Map (attached).
These samples were collected because there are volatile organic compounds (VOCs) in
the groundwater under the houses in your area, including your house. The source of the
VOCs was explained in the letter EPNG sent to you on May 11, 2007. "Volatile" means
that VOCs can evaporate out of groundwater. Evaporated VOCs could move through the
soil gas into buildings above the groundwater. "Soil vapor or soil gas" arc terms used to
describe the gas or vapor contained in the soil above the groundwater.
This letter presents information on the laboratory results of the soil gas and next steps
proposed by EPNG.
Results of the Soil Gas Samples
The results from February 2008 indicate that soil gas samples from your property
contained three of the ten VOCs identified as being present at the former Burlington Plant
(now owned by EPNG) (referred to in this letter as "site related chemicals" or "site
related VOCs"). These three site related chemicals i.e. tetrachloroethcnc, (also called
perchloroethylene or PCE), methylene chloride, and chloroform were detected in soil gas
and their concentrations arc shown on Tables 1 and 2 along with the June 2007 results.
PCE, and methylene chloride, although not detected in the June 2007 sampling event,
were detected at very low concentrations during the February 2008 sampling in the deep
soil gas sampling locations. These concentrations are below the screening levels the
• •
Mrs. Mary Rankin Derr
April 28, 2008
Page 2 of3
United States Environmental Protection Agency (USEPA) considers acceptable for soil
gas, as discussed in more detail in this se_ction.
The USEPA screening levels arc established within a range of concentrations that have
been determined to be acceptable based on the potential for adverse health effects over a
lifetime, if one is exposed to that concentration for 30 years. USEPA uses this range to
determine if action is recommended to reduce potential exposure to the chemicals.
USEPA policy has determined that:
For concentrations below the lowest acceptable concentration (called the 10'6
level), the possibility of adverse health risks is extremely low or insignificant.
• For concentrations above the highest end of the range (called the 10-4 level),
action to reduce exposure or further investigation may be warranted.
• For concentrations within the 1 o·6 to 10·4 range, action may not be warranted
depending on the level of confidence in the results e.g. a high level of
confidence allows a higher acceptable level.
The concentrations of PeE, chloroform, and methylene chloride are below the Io·" risk
screening levels that USEPA considers acceptable indicating that the VOCs in soil gas do
not pose a concern to indoor air.
Next Steps
We have now performed two sampling events on your property. These events were
purposely performed at different times of the year (summer and winter). The results from
these events show that the concentrations of VOes in soil gas at your property arc
consistent and representative, despite changes in weather that can sometimes affect the
detected concentrations. The results also indicate, based on USEPA standards, that the
voes detected pose little concern for human health in indoor air on your property.
We do not currently anticipate a need to perform any additional sampling at your
property; however, subject to your agreement, we would like to keep the sampling points
available for potential luture sampling. If we decide to undertake any additional
sampling, we will contact you again to explain what is being planned and why, and to
request permission to enter your property. In the meantime, you should be receiving
regular Fact Sheets about site remediation activities to help keep you up to date on what
is happening. Please be assured that we will remove the sampling points as soon as we
have completed our vapor intrusion assessment in your neighborhood. At that time, the
area will be restored to its original condition.
Please feel rree to contact me at 713-420-3425 if you would like any additional
information about the vapor intrusion evaluation process. As you know, EPNG is
• Mrs. Mary Rankin Derr
April 28, 2008
Page 3 of3
•
working under the direction of USEPA. If you have any questions, please contact Ken
Mallary of USEPA at 404-562-8802 or Nile Testerman who is with the North Carolina
Department of Environment and Natural Resources (NCDENR) at 919-508-8482.
Sincerely,
Brian S. Johnson
El Paso Natural Gas Company
cc: Janet McQuaid, EPNG
Jennil'cr Porter, Gurne Porter, PLLC
Ken Mallary, USEPA
Nile Testerman, NC:DENR
Enclosure: Map of Sampling Locations, Tables 1 and 2
E ro ;;;
0
~ ;ll
;i;
~
(!) z a. ~ ~ w ~ ~ ~
•
VP-13E. 0
0
LEGEND
(D SHALLOW WELL LOCATION
rl,l INTERMEDIATE WELL LOCATION
-!ID DEEP WELL LOCATION
0 SEMI-PERMANENT SOIL GAS SAMPLE LOCATION
0 SEMI-PERMANENT PIEZOMETER LOCATION FOR
GROUNDWATER SAMPLE
Q GEOPROBE LOCATION FOR "GRAB" GROUNDWATER
SAMPLE (NOT PERMANENT POINT)
40
SCALE
•
\N· -).'_"):::; ,·-r, ~-L.J
0 40
SAMPLE LOCATIONS FOR
1633 WEST FRONT STREET
FCX-STATESVILLE SUPERFUND SITE OU3
STATESVILLE, NORTH CAROLINA
80
FEET
134391.001.002 03/08
B.ROWN AND
CAJ_,DWELL Nashvillu, Tcmnei;see a.L ____________________ ....1, _______________ _.
•
Volatile Organic
Compounds•
Sam le Date
Sam lo lntorval
Lab
Tetrachloroethene (PCE)
Trichloroethene {TCE)
cis-1,2-Dichloroethene (cDCE)
Vinyl chloride
Carbon tetrachloride
Chloroform
1, 1-Dichloroethene
1,2-Dichloropropane
Methylene chloride
1, 1,2-Trichtoroethane
Footnotes:
Table 1
Shallow Soll Vapor Results
1633 West Front Street
µglm3
µg/ml
µg/m3
µg/ml
µg1nl
µg/ml
µg/m3
µg/ml
•
Results
1633 West Front
Street
VP-13Ns
211912008
Lab B
3.5 i
1.1 U
0.79 U
0.51 U
1.3 U
0.98 U
0.79 U
0.92 U
0.69 U
1.1 U
"Sile-related VOCs as listed in Table 2 of the September 2006 Explanation of Significant Difference (ESD)
for FCX Operable Unit 3 (OU3).
bUnits are in µg/m~ = mic1ograms per cubi: meter
0USEPA Screening Level is from the Target Shallow Soil Gas Concentration Corresp:mding to Indoor Air Concentration
{soil gas to indoor air attenuation factor of 0.1) from Table 2c and 3.3-SG (1 x10~ risk is low range; 1x 10 .. is high range)
in the USEPA OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and so·~s
{Subsurface Vapor Intrusion Guidance) (2002}
't>irection (i.e., north, cast. west, south) refers to lhe direction the sample is localed adjacent lo house.
°Feel below ground surface.
1 LabOratory data quatifiers are as follows:
J means the the concentration was dose to the reporting limit and is esLmated.
The actual concentration could be slighUy higher or lower.
U means that the voe was not identified in the sample above the concentration reporting limit.
•
Volatile Organic
Compounds• Unitsb
Table 2
Deep Soil Vapor Results
1633 West Front Street
,1:rf :;ii~.:t
•
Results
1633 Wost Front Street
'.-}t·ow:r North d East
VP-13N VP-13N VP-13E
Sam le Date 6/2012007 211812008 6120/2007
Sam le Interval ft/ 18-20 18-20 8-10
lab Lab A Lab B Lab A
Tctrachloroethene (PCE) 11 U1
Trichloroethene (TCE) 8.6 U
cis-1,2-Dichloroethene (cDCE) 6.3 U
Vinyl chloride 4.1 U
Carbon tetrachloride 10 U
Chloroform 4.9 J
1, 1-Dichloroethene 6.3 U
1,2-Dichloropropane 7.4 U
Methylene chloride 5.6 U
1 , 1,2-T richloroethane µg/m3 8.7 U
Footnotes:
'Site-related voes as 6stcd in Table 2 of the September 2006 Explanation of Significant Difference (ESD)
for FCX Operable Unit 3 (OU3).
"Units are in µglm3 = micmgrams per cubic meler
1.4 J
1.1 U
0.79 U
0.51 U
1.3 U
1.5 J
0.79 U
0.92 U
3.4 J
1.1 u
'USEPA Screening Level is from the Target Ocep Soll Gas Concentration Corresponding to Indoor Air Concentration
(soil gas to ~,door ail attenuation factor of 0.01) from Table 2c and 3a-SG {1x10.i; risk is row range; 1x10"" is high range)
in !he USEPA OSVi/ER Dratt Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils
(Subsurface Vapor Intrusion Guidance) (2002)"The attenuation factor of 0.01 is recommended for basements as
referenced by Department of Toxic Substances Control, California EPA Interim Final Guidance for 1he Evaluation and
Mitigation of Subsurface Vapor Intrusion to Indoor Air, Revised February 7, 2005.
"Direction (i.e., north, east, west, south) refers to the direction the sample is located adjacent to house.
•Feet below ground surface.
1 Laboratory data qualifiers are as follows:
J means the the concentration was close to the reporting limit and is estimated.
The actual concenlfation could be slighUy h9her or lower.
U means lhat the VOC was not identified in the sample above the concentration reporting limit.
11 U
8.6 U
6.3 U
4.1 U
10 U
7.8 U
6.3 U
7A U
5.6 U
8.7 U
VP-13E
2/1912008
8-10
Lab B
1.4 U
1.1 u
0.79 u.
0.51 U
1.3 U
0.98 U
0.79 U
0.92 U
0.76 J
1.1 u
Date:
Owner/Resident Name:
Address:
Phone number:
Best Contact number:
Purpose of Meeting:
• •
Communication Data Sheet
FCX-Statesville Superfund Site OU3
Time:
,/ ✓-
Lee Allen Woods & Joyce Brown (Co-owners)
1627 W, Front Street
Lee 704-872-7746 / Joyce 704-873-7035
Discuss February 2008 Soil Gas & Groundwater Sampling Results
Documents left with owner/resident:
Documents shared but not left with owner/resident: rv/f ~~-------------------
Content of Meeting:
•.• cc ,i-.)'i,-...1dl.i_~ ,· .s;. ·\ SW ~~'L-'
/yJ}P;,i-.,°y,JC.,;,,, "' •<)'l-J lM ti -,-r
Action Items for Follow-up:
Return visit?
Additional information to be mailed?
Follow-up phone call?
Other?
Personnel Conducting Meeting:
P:\Clients\EI Paso\EPNG FCX\134391 -FCX Winter 2008 Vapor Sampling\001-002\Communication Datn Shccts\Oorr.xls
ft,,,
4/27/2008
•
•
A elpaso
April 28, 2008
Mr. Lee /\l!en Woods
759 Eufola Road
Statcsvil!c, NC 28677
Ms . .Joyce Brown
1627 W. Front Street
Statesville, NC 28677
RE: 1627 West Front Street
•
1001 I .ouisian;1 Sttccl
l !oustrn1, TX 77002
?lJ-420-3827
FCX-Statesville Superfund Site Operable Unit 3, Statesville, NC (OU] or Site)
Dear Mr. Woods and Ms. Brown:
1 am writing to fol!ow up on the recent subsurface sampling that was performed as part of
a vapor intrusion evaluation al i 627 West Front Street. /\s you are aware, Brown and
Caldwell (BC), on behalf of El Paso Natural Gas Company (EPNG), re-sampled the two
soil gas sampling points on the property on February I 8 and 19, 2008. They also
instal!ed an additional shal!ow soil gas sampling point during this time. The locations
from which these samples were taken are shown on the Sampling Location Map
(al\ached).
These samples were col!ected because there arc volatile organic compounds (VOCs) in
the groundwater under some properties in your area, including your property. The source
of the VOCs was explained in the letter EPNG sent to you on May 11, 2007. "Volatile"
means that VOCs can evaporate out of groundwater. Evaporated VOCs could move
through the soil gas into buildings above the groundwater. "Soil vapor or soil gas" arc
terms used to describe the gas or vapor contained in the soil above the groundwater.
This letter presents information on the laboratory results of the soil gas and next steps
proposed by EPNG.
Results of the Soil Gas Samples
The results from this sampling event indicate that soil gas samples from your property
contained three of the ten VOCs identified as being present at the former Burlington Plant
(now owned by EPNG) (referred lo in this letter as "Site related chemicals" or "Site
related VOCs''). These three Site related chemicals arc tctrachlorocthcnc, (also called
/
• •
Mr. Woods and Ms. Brown
April 28, 2008
Page 2 of3
perchloroethylene or PCE), cis-1,2-dichloroethene (also called cDCE), and methylene
chloride. Their concentrations arc shown on Table I and 2 along with the August 2007
results. CDCE, although not detected in the August 2007 sampling event, was detected at
a very low concentration in the deep sample during the winter sampling. These
concentrations arc within the range the USEPA considers acceptable for soil gas below
homes, as discussed in more detail in this section.
The USEPA screening levels are established within a range of concentrations that have
been detennined to be acceptable based on the potential for adverse health ctfocts over a
lifetime, if one is exposed to that concentration for 30 years. USEPA uses this range to
determine if action is recommended to reduce potential exposure to the chemicals.
USEPA policy has determined that:
For concentrations below the lowest acceptable concentration ( called the 1 o·<•
level), the possibility of adverse health risks is extremely low or insignificant.
For concentrations above the highest end of the range ( called the I 0-4 level),
action to reduce exposure or further investigation may be warranted.
• For concentrations within the 1 o-6 to I 0-4 range, action may not be warranted
depending on the level of confidence in the results e.g. a high level of
confidence allows a higher acceptable level.
For the winter sampling results, the concentrations of PCE, presently, and TCE and
cDCE, both historically and presently, are below the I0-6 risk screening level. EPNG
believes that the observed concentrations are within an acceptable range as defined by
USEPA's conservative risk screenin~ values for soil gas. Chloroform and methylene
chloride, presently, arc below the Io-risk range indicating that the VOCs in soil gas do
not pose a concern to indoor air.
Next Steps
We have now performed two sampling events on your property. These events were
purposely performed at different times of the year (summer and winter). The evidence
indicates that the concentrations of VOCs in soil gas pose little concern for human health
in indoor air on your property. At this time, and subject of course, to your agreement, we
would like to keep the sampling points available for future sampling. If we decide to
undertake any additional sampling, we will contact you again to explain what is being
planned and why, and to request permission to enter your property. Please be assured
that when the sampling points are removed, the area will be restored to its original
condition. In the meantime, you should be receiving regular Fact Sheets about site
remediation activities to help keep you up to date on what is happening.
•
Mr. Woods and Ms. Brown
April 28, 2008
Page 3 of3
•
Please feel free to contact me at 713-420-3425 if you would like any additional
information about the vapor intrusion evaluation process. As you know, EPNG is
working under the direction of USEP A. If you have any questions, please contact Ken
Mallary of USEPA at 404-562-8802 or Nile Testerman who is with the North Carolina
Department of Environment and Natural Resources (NCDENR) at 919-508-8482.
Sincerely, . l t-1 {\ _/\1.,.0vV\ ~-· ,_,., . .fv1Vt r} ·Vi
Brian S. Johnson
El Paso Natural Gas Company
cc: Janet McQuaid, EPNG
Jennifer Porter, Gurne Porter, PLLC
Ken Mallary, USEPA
Nile Testerman, NCDENR
Enclosure: Map of Sampling Locations and Tables I and 2
w m E 0 €,
E m ~ 0
~
0:,
8 N
.,-; N
~
;;;
M ;I;
@
CJ z a. "' g
I:.
ijj ~
•
I
I;; ,ffe t;
t-,p ,__~
!fl -i' I
VP-14Nd ~
•,
Nq'.'1'((!5
• VP~_14
LEGEND
S') SHALLOW WELL LOCATION
0 SEMI-PERMANENT SOIL GAS SAMPLE LOCATION 0 SEMI-PERMANENT PIEZOMETER LOCATION FOR GROUNDWATER SAMPLE
40
SCALE
•
--
--
""-
0 40
SAMPLE LOCATIONS FOR
1627 WEST FRONT STREET
FCX·STATESV!LLE SUPERFUND SITE OUJ STATESVILLE, NORTH CAROLINA
·,.!'
80
FEET
134391.001.002 03/0B
V BROWN AND ~ CALDWELL Nashville, Termesseci
a.._ _______________________________________________
_.
Table 1 1527 W Fro.11 SI SG Shallow
Table 1
Shallow Soil Gas Results
1627 West Front Street
Results Volatile Organic
Compounds 1 1627 West Front Street
VP-14Ns
2119/2008
ft/b se 5-7
µg/m3 1.4 u'
Trichloroethene (TCE) µg/mJ 1.1 U
cis-1,2-Oichloroethene {cDCE) µg/mJ 0.79 U
Vinyl chloride µg/m3 0.51 U
Carbon tetrachloride µgtm3 1.3 U
Chloroform µg/m3 0.98 U
1 , 1-Dich!oroethene µg/m3 0.79 U
1,2-Dichloropropane µg/m3 0.92 U
Methylene chloride µg/ml 1.1 J
1, 1,2-Trichloroethane µg/m3 1.1 U
Footnotes:
"Site-related voes as listed in Table 2 of the September 2006 Explana~on of Significant Cifference (ESD)
for FCX Operable Unit 3 (OUJ).
bUnits are in µglm3 = micrograms per o.;bic meter
North
cUSEPA Screening Level is from tt:e Target Shallow Soil Gas Concentra!io,1 Corresponding lo Indoor Air Concentration
(soil gas to indoor air atlenuation factor of0.1} rrnm Table 2c a;id 3a-SG (1x10-& risk is low range; 1x10_. is high range)
VP-14Ns
(Duplicate)
2/19/2008
5-7
2.6 J
1.1 U
0.79 U
0.51 U
1.3 U
0.98 U
0.79 U
0.92 U
1.2 J
1.1 U
in lhe USEPA OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and So:ls
(Subsurface Vapor Intrusion Guidance} (2002)
dDirection (i.e., north, easL wesl, south} refers to 1he direction the sample is localed adjacent to house.
tfeet below ground surface.
Lat>oralory data qualifiers are as fo:lows
J means !he the concentration was close to the reporting limit and is estimated.
Tne aclual co;1centration could be slightly higher or lower.
U means that the VOC was not iden~fied in the sample above the concentration reporting limil
•
•
Tablet 1627WFrootStSGDeep
Volatile Organic
Compounds 0
Table 2
Deep Soil Gas Results
1627 West Front Street
Results
1627 West Front Street
North West
VP-14N VP-14N
Sam le Date 8115/2007 211812008
Sam le lnteival 16-18 16-18
Tetrachloroethene (PCE) 1,600 Dr 2.1 J
Trichloroethene (TCE) 1.1 U 1. i u
cis-1,2-Dich!oroethene (cDCE) 0.79 U 0.83 J
Vinyl chloride 0.51 U 0.51 U
Carbon tetrachloride 2.8 J 1.3 U
Chloroform 1.7 J 0.98 U
' ' . j1, 1-0ichloroethene 0.79 U 0.79 U
1,2-Dichloropropane 0.92 U 0.92 U
Methylene chloride 0.69 U 2.3 J
1, 1,2-Trichloroethane 1.1 U 1.1 U -"Siie-relate-d voes as liS:ed in Table 2 oflhe Septembe: 2006 Expli:lfla~ori of Significan! o;r.erence {ESD)
for FCX Ope;able Uflit 3 (OU3).
bUnits are in µg/m3 = micrograms per cubic meter
"USEPA Screening Level is from the Target Deep Soil Gas Coocentratioo Cotrespor.ding to Indoor Air Concentration
(soil gas to indoor air attenuation faclor or 0.01) from Table 2c and 3a-SG (h:10°' risk is low ri:lflge; M(r' is high range)
~, tt·.e USE PA OSWER Ora:i Guidal'lCe tor i:'la!uating the Vapor Intrusion to lr,doo; P."ir ?athway from Ground"Nate1 ar,d Soi!s
{S:.ibsurlace Var,:;r lr.:.Usion Guidance) (2002)""The at;enuation factof ol 0.01 is 1ecommended fm baserr.ents as
referenced by Department of ioxic Substances Contrcr, Cafifo:nla EPA lmertm Final Guidance for lhe Evalua1ion an:l
WiticJation of Subsurface Vapor lntrusioo to lndOOf Air, Revi~ February 7, 2005.
~Dl,cc\ion Q.e., norill, east. west, SOttJl) re~rs to tr.e direc~on tr.e sample is IOcated adjacen; to h::iose.
"Feet below ground surface.
1 Labcfa'.ory data qua~~ers are as follo"Ns:
J means the the concen!ratio;; was dose l:i the repcrtirig fimitand is estimated.
The actual co:1cen:ra1Kll1 cou!d be slightly higher or lower.
U mear,s Iha: lhe voe was llOI iden:,:ied ~., l,"1e sam;ile at,o,.-e the concentraliOn 1€r,:;rtn9 limit
D means that the sample tl&j hig:-J cooceotratioflS and was diluted for analysis
VP-14W VP-14W
8/15/2007 2/1812008
13-15 13-15
7.0 1.4 U
3.7 J 1.1 U
0.79 U 0.79 U
0.51 U 0.51 U
1.3 U 1.3 U
1.3 J 0.98 U
0.79 U 0.79 U
0.92 U 0.92 U
1.0 J 2.8 J
,., u 1.1 U
•
•
• •
Communication Data Sheet
FCX-Statesville Superfund Site OU3
Date:
Owner/Resident Name:
Address:
Phone number:
Best Contact number:
Time:
S'h,•~•nwi k.tti/w. Cic-,l
·'faaara MaHl1e11s (Te11antt:-
1625 W. Front Street
fi!/..orr;s ""'
11 t .. d /.-""( ,./,,'vd
Purpose of Meeting: Discuss February 2008 Soil Gas & Groundwater Sampling Results
Documents left with owner/resident:
Documents shared but not left with owner/resident:
Content of Meeting:
Action Items for Follow-up:
Return visit?
Additional information to be mailed?
Follow-up phone call?
Other?
Personnel Conducting Meeting:
r!J
P:IC!i1mts\EI Paso\EPNG FCX\134391 · FCX Winier 2008 Vapor Sampling\001-002\Communicalion Dala Shee1s\Tnnarn Matthews.xis 412712008
•
~ elpaso
April 28, 2008
t>,IN"-<· 1:..Wara Ma!tAews ~Jht\nn~'A
1625 West f-ront Street
Statesville, NC 28677
Re: 1625 West Front Street
•
I 001 1.ouisimrn Street
1-louswn, TX 77002
713-420-3827
FCX-Statesville Superfund Site, Operable Unit 3 Statesville, NC (OU3 or site)
Dear Ms. Matthews:
I am writing to follow up on the recent subsurface sampling that was performed as pan of
a vapor intrusion evaluation at 1625 West Front Street. As you are aware, Brown and
Caldwell (BC), on behalf of El Paso Natural Gas Company (EPNG) installed three semi-
permanent soil gas sampling points and one temporary groundwater sampling point
(piczomcter) on the properly on February 13, 2008. On February 18 and 19, 2008 BC
collected one groundwater sample from the piezometer and three soil gas samples from
the soil gas points. The locations from which these samples were taken are shown on the
Sampling Location Map (attached).
These samples were collected because there arc volatile organic compounds (VOCs) in
the groundwater under the houses in your area, including your house. The source of the
VOCs was explained in the letter EPNG sent to you on r:ebruary 11, 2008. "Volatile"
means that VOCs can evaporate out of groundwater. Evaporated VOCs could move
through the soil gas into buildings above the groundwater. "Soil vapor or soil gas" are
terms used lo describe the gas or vapor contained in the soil above the groundwater.
This letter presents information on the laboratory results of the soil gas and groundwater
samples and next steps proposed by EPNG
Results of the Soil Gas Samples
None of the VOCs identified as being present at the former Burlington Plant (now owned
by EPNG) (referred to in this letter as "site related chemicals" or "site related VOCs)
were detected in the shallow soil gas samples from your propc,ty (sec Table 1 ). Deep
soil gas samples from your property contained five of the ten site related VOCs. The
concentrations of these chemicals are shown on Table 2. The five chemicals detected are
• • f,\('l\tf,,. ~
Ms. Matthews :S'i,..,,,,,M ll,.J,~ Cl,.,,1,,_ 'lib" lli"'''"'
April 28, 2008
Page 2
called tetrachloroethene (also called perchlorocthylene or PeE), cis-1,2-dichloroethcnc
(also called cDeE) chloroform, methylene chloride, and 1, 1,2-Trichoroethanc. EPNG
believes that the .concentrations are within the range the United States Environmental
Protection Agency (IJSEPA) will consider acceptable for soil gas below homes at this
site, as discussed in more detail in this section.
The IJSEPA has established screening levels to evaluate whether concentrations ofVOCs
in the soil vapor are a potential concern to people living in houses above the soil gas.
Tables I and 2 show the USEPA screening levels and the concentrations of that voe l'or
each site related voe in soil gas at the sampling points on your property .
. The US EPA screening levels are represented by a range of acceptable concentrations set
in accordance with USEPA policy. The acceptable concentrations are based on the
potential for adverse health effects over a lifetime if one is exposed to that concentration
for 30 years. IJSEPA uses this range to determine if action is recommended to reduce
potential exposure to the chemicals. USEPA policy has determined the following:
• For concentrations below the lowest acceptable concentration (called the 10-6
level), the possibility of adverse health risks is extremely low or insignificant.
• For concentrations above the highest end of the range (called the I 0·4 level),
action to reduce exposure or further investigation may be warranted.
• For concentrations within the 10-6 to 10-4 range, action is not necessarily
warranted depending on the level of confidence in the results e.g. a high level
of confidence allows a higher acceptable level.
No site related VOC were detected in the two shallow soil gas vapor samples, collected
from 5-7 feet below ground surface (Sec Table I). Five site related voes were detected
in the deep soil gas vapor sample collected from 14-16 feet below ground surface (Sec
Table 2). Of these voes, the concentrations of cDCE, and methylene chloride are well
below the 10·6 risk screening level that IJSEPA considers acceptable; while the
concentrations of PeE, chloroform, and 1, 1,2-trichlorocthanc arc less than the 10-5 risk
screening level. The concentrations of PeE, chloroform, and I, 1,2-trichlorocthane in
deep soil gas are within the range for which further investigation may not be warranted
according to USEPA conservative risk screening levels. EPNG believes that these
concentrations are within the range that USEPA will consider acceptable for soil gas
below homes at this site.
Results of the Groundwater Sample
Table 3 shows the USEPA performance standard for the site related voes in
groundwater and the concentration of that substance at the sampling point on the
property. With the exception of carbon tetrachloride, no site related VOCs were detected
Ms. Matthews
April 28, 2008
Page 3
• •
in the groundwater above their respective screening levels. For carbon tetrachloride, the
concentration was estimated and barely over the performance standard for drinking water.
These performance standards· assume that the groundwater is used for drinking. As you
arc aware, there are no groundwater wells at the site (except for the monitoring wells that
arc not used for any other purpose), and the City of Statesville supplies drinking water to
the neighborhood. Consequently, there is no exposure to VOCs from the groundwater.
Next Steps
On technical review, the data indicate that the concentrations of voes in soil gas pose
Iitt.Ic concern for human health in indoor air on your property; however, to confirm that
the voe results from this event are consistent and representative, we would like to
perform another round of sampling at your property, possibly in the summer months. We
would like to keep the sampling points available for this re-sampling. We will contact
you again when planning for this foturc sampling event is further advanced to explain
what we intend to do and to request your concurrence. In the meantime, you should be
receiving regular Fact Sheets about site remediation activities to help keep you up to date
on what is happening.
Please feel free to contact me at 713-420-3425 if you would like any additional
information about the vapor intrusion evaluation process. As you know, EPNG is
working under the direction of USEPA. If you have any questions, please contact Ken
Mallary of USEPA at 404-562-8802 or Nile Testerman who is with the North Carolina
Department of Environment and Natural Resources (NCDENR) at 919-508-8482.
Sincerely,
£vv,J ,1 ~ ~-c:.;-!,.,._,,___;t<711,1
Brian S. Johnson
El Paso Natural Gas Company
cc: Janet McQuaid, EPNG
Jennifer Porter, Gurne Porter, PLLe
Ken Mallary, USEPA
Nile Testerman, NeDENR
Enclosure: Map of Sampling Locations; Tables I, Table 2, and Table 3
iii ;i;
~
\t "-~ ~
i
•
LEGEND
0 SEMI-PERMANENT SOIL GAS SAMPLE LOCATION
Q SEMI-PERMANENT PIEZOMETER LOCATION FOR
GROUNDWATER SAMPLE
SCALE
•
VP-18Ed
0 40
SAMPLE LOCATIONS FOR
1625 WEST FRONT STREET
FCX-STATESV!LLE SUPERFUND SITE OU3
STATESVILLE, NORTH CAROLINA
80
F[[T
134391.001.002 03/08
-~ EH.OWN AND ~ CALD"\-VELI... N11shvi11C?, Tennessee! "-L.------------------------'-----------------.....J
•
Table 1
Shallow Soil Gas Results
1625 West Front Street
•
Volatile Organic
Compounds'
Results
Unitsb 1625 West Front Street
East
VP-18Es
mon 2/19/2008
ft/ 5-7
T etrachloroethene (PCE) 1.4 ur
Trichloroethene (TCE) 1.1 U
cis-1,2-Dichloroethene (cDCE) µg/m3 0.79 U
Vinyl chloride µg/m3 0.51 U
Carbon tetrachloride µg/m3 1.3 U
Chloroform µg/m3 0.98 U
1, 1-Dichloroethene µg/m3 0.79 U
1,2-Dichloropropane µg/m3 0.92 U
Methylene chloride µg/m3 0.69 U
1, 1,2-Trichloroethane 1.1 U
Foolnotes:
'Site-related VOCs as listed in Table 2 of the September 2006 Explanation of Significant Difference (ESD)
for FCX Operable Unit 3 (OU3).
,Units are in µg/m3; micrograms per cubic meter
West
VP-18W
2/19/2008
5-7
1.4 U
1.1 U
0.79 U
0.51 U
1.3 U
0.98 U
0.79 U
0.92 U
0.69 U
1.1 U
'USEPA Screening Level is from the Target Shallow Soil Gas Concentration Corresponding to Indoor Air Concentration
(soil gas to indoor air attenuation factor of 0.1) from Table 2c and 3a-SG (1 x10'6 risk is low range; 1x10·' is high range)
in the USEPA OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils
(Subsurface Vapor Intrusion Guidance) (2002)
'Direction (i.e., north, east, west, south) refers to the direction the sample is located adjacent to house.
'Feet below ground surface.
1 Laboratory data qualifiers are as follows:
U means that the VOC was not identified in the sample above the concentration reporting limit.
Table 1 1625 W Front SG Shallow
•
Table 2
Deep Soil Gas Results
1625 West Front Street
Volatile Organic
Compounds a
Sam le Date
Sam le Interval
Tetrachloroethene (PCE)
Trichloroethene (TCE) µg/m3
cis-1,2-Dichloroethene (cDCE) µg/m3
Vinyl chloride µg/m3
Carbon tetrachloride
Chloroform
1, 1-Dichloroethene µg/m3
1,2-Dichloropropane µg/m3
Methylene chloride µg/m 3
1, 1,2-T richloroethane µg/m 3
Footnotes:
•
Results
1625 West Front
Street
Easta
VP-18Ed
2/18/2008
14-16
140 D'
11 UD
18 JD
5.1 UD
13 UD
27 JD
7.9 UD
9.2 UD
26 JD
30 JD
'Site-related VOCs as listed in Table 2 of the September 2006 Explanation of Significant Difference (ESD}
for FCX Operable Unit 3 (OU3).
bUnits are in µg/m3 = micrograms per cubic meter
'USEPA Screening Level is from the Target Deep Soil Gas Concentration Corresponding to Indoor Air Concentration
(soil gas to indoor air attenuation factor of 0.01) from Table 2c and 3a-SG (1x10·' risk is low range; 1x10'' is high range)
in the USEPA OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils
(Subsurface Vapor Intrusion Guidance) (2002}"The attenuation factor of 0.01 is recommended for basements as
referenced by Department of Toxic Substances Control, California EPA Interim Final Guidance for the Evaluation and
Mitigation of Subsurtace Vapor Intrusion to Indoor M, Revised February 7, 2005.
'Direction (i.e., north, east, west, south) refers to the direclion lhe sample is located adjacent to house.
'Feet below ground surface.
1 Laboratory data qualifiers are as follows:
J means the the concentration was close to the reporting limit and is estimated.
The aclual concentration could be slightly higher or lower.
U means that the VOC was not identified in the sample above the concentration reporting limit.
D means that the sample had high concentrations and was diluted for analysis
Table 1 1625 W Front Sg Deep
•
Volatile Organic
Compounds'
le Date
le Interval
Tetrachloroethene (PCE)
Trichloroethene (TCE)
Table 3
Groundwater Sample Results
1625 West Front Street
Unitsb
µgll
µg/L
Groundwater
Performance
Standardsc
cis-1,2-Dichloroethene (cDCE) µg/L
Vinyl chloride µg/L
Carbon tetrachloride µg/L
Chloroform µg/L
1, 1-Dichloroethene µg/L
1,2-Dichloropropane µg/L
Methylene chloride µg/L
1.1,2-Trich/oroethane . µg/L
Foolnoles:
•
Results
1625 W Front St
PZ-18s
2/19/2008
23-28
0.6
0.2 J'
0.8 U
0.1 U
0.3 J
0.8 U
0.8 U
0.1 U
2.0 U
0.8 U
'Site-related voes as listed in Table 2 of the September 2006 Explanation of Significant Difference
(ESD) for FeX Operable Unit 3 (OU3).
'Units are in µg/L = micrograms per liter
'Groundwater Performance Standards for site-related VOCs are listed in Table 2 of the September
2006 ESD for FeX OU3.
'Feel below ground surtace
'Data qualifiers are as follows:
U means that the voe was not identified in the sample above the concentration reporting limit.
J means the !he concentration was close lo the reporling limil and is estimated.
The actual concentration could be slightly higher or lower.
Table 2 1625 W Fro·nt St Water
Date:
Owner/Resident Name:
Address:
Phone number:
Best Contact number:
Purpose of Meeting:
• •
Communication Data Sheet
FCX-Statesville Superfund Site OU3
'J-~ >i'J;;1" Time: r-'[_n
Vernon & Catherine Keaton (Owners)
1625 W. Front Street
704-873-8536
Discuss February 2008 Soil Gas & Groundwater Sampling Results
Documents left with owner/resident: / 1 (/ .(j,d vJ ,· ft. M 7/4J;;., •
Documents shared but not left with owner/resident: N.,q.._ __________________ _
Content of Meeting:
fo u4f fvl
Action Items for Follow-up:
Return visit?
Additional information to be mailed?
Follow-up phone call?
Other?
Personnel Conducting Meeting:
1P
P:\Clients\EI Paso\EPMG FCX\134391 -FCX Winter :woe Vapor Sampling\001-002\Communlcation Da1a Shee1s\Woods-Brown.xls 4/27/2008
•
A elpaso
April 28, 2008
Mr. and Mrs. Vernon and Catherine R. Keaton
534 Broadway Court
Statesville, NC 286 77
Re: 1625 West Front Street
•
100! l.ouisiana S!rcct
Houston, TX 77002
713-420-3827
l'CX-Statcsvillc Superfund Site, Operable Unit 3 Statesvilk, NC (OU3 or site)
Dear Mr. and Mrs. Keaton:
I am writing to follow up on the recent subsurface sampling that was performed as part of
a vapor intrusion evaluation at I 625 West Front Street. As you are aware, 13rown and
Caldwell (13C), on behalf of El Paso Natural Gas Company (EPNG) installed three semi-
permanent soil gas sampling points and one temporary groundwater sampling point
(piczometer) on the properly on February 13, 2008. On February I 8 and 19, 2008 BC
collected one groundwater sample from the piezometer and three soil gas samples from
the soil gas points. The locations from which these samples were taken are showi1 on the
Sampling Location Map (attached).
These samples were collected because there are volatile organic compounds (VOCs) in
the groundwater under the houses in your area, including your huuse. The source of the
voes was explained in the letter EPNG sent to you on February 11, 2008. "Volatile"
means that voes can evaporate out of groundwater. Evaporated VOCs could move
through the soil gas into buildings above the groundwater. "Soil vapor or soil gas" arc
terms used to describe the gas or vapor contained in the soil above the groundwater.
This lellcr presents information on the laboratory results of the soil gas and groundwater
samples and next steps proposed by EPNG
Results of the Soil Gas Samples
None of the YOCs identified as being present at the former Burlington Plant (now owned
by EPNG) (referred to in this letter as "site related chemicals" or "site related VOCs)
were detected in the shallow soil gas samples from your properly (sec Table 1 ). Deep
soil gas samples from your property contained five of the ten site related VOCs. The
coocentralions of these chemicals are shown on Table 2. The five chemicals detected arc
•
Mr. & Mrs. Keaton
April 28, 2008
Page 2
•
called tetrachloroethcne (also called perchloroethylcne or PCE), cis-1,2-dichloroethenc
(also called cDeE) chloroform, methylene chloride, and I, 1,2-Trichorocthane. EPNG
believes that the concentrations arc within the range the United States Environmental
Protection Agency (USE!' A) will consider acceptable for soil gas below homes at this
site, as discussed in more detail in this section.
The USEPA has established screening levels to evaluate whether concentrations ofVOes
in the soil vapor arc a potential concern to people living in houses above the soil gas.
Tables I and 2 show the USEPA screening levels and the concentrations of that voe for
each site related voe in soil gas at the sampling points on your property.
The US EPA screening levels are represented by a range of acceptable concentrations set
in accordance with USEPA policy. The acceptable concentrations are based on the
potential for adverse health effects over a lifetime if one is exposed to that concentration
for 30 years. USEP A uses this range to determine if action is recommended to reduce
potential exposure to the chemicals. USEPA policy has determined the following:
!'or concentrations below the lowest acceptable concentration ( called the 10-6
level), the possibility of adverse health risks is extremely low or insignificant.
For concentrations above the highest end of the range (called the 10·4 level),
action to reduce exposure or further investigation may be warranted.
For concentrations within the 10-6 to Io-< range, action is not necessarily
wan-anted depending on the level of confidence in the results e.g. a high level
of confidence allows a higher acceptable level.
No site related VOC were detected in the two shallow soil gas vapor samples, collected
from 5-7 feet below ground surface (Sec Table I). Five site related VOCs were detected
in the deep soil gas vapor sample collected from 14-16 feet below ground surface (Sec
Table 2). Of these VOCs, the concentrations of cDCE, and methylene chloride arc well
below the 10·6 risk screening level that USEPA considers acceptable; while the
concentrations of PeE, chloroform, and I, 1,2-trichlorocthane arc less than the 10·5 risk
screening level. The concentrations of !'CE, chloroform, and I, 1,2-trichlorocthanc in
deep soil gas are within the range for which further investigation may not be warranted
according to USEP A conservative risk screening levels. EPNG believes that these
concentrations arc within the range that USEPA will consider acceptable for soil gas
below homes at this site.
Results of the Groundwater Sample
Table 3 shows the USE!' A performance standard for the site related VOCs in
groundwater and the concentration of that substance at the sampling point on the
property. With the exception of carbon tetrachloride, no site related voes. were detected
• Mr. & Mrs. Keaton
April 28, 2008
Page 3
•
in the groundwater above their respective screening levels. For carbon tetrachloride, the
concentration was estimated and barely over the performance standard for drinking water.
These performance standards assume that the groundwater is used for drinking. As you
are aware, there are no groundwater wells at the site (except for the monitoring wells that
arc not used for any other purpose), and the City of Statesville supplies drinking water to
the neighborhood. Consequently, there is no exposure to VOCs from the.groundwater.
Next Steps
On technical review, the data indicate that the concentrations of VOCs in soil gas pose
little concern for human heal!h in indoor air on your property; however, to confirm that
the VOC results from this event are consistent and representative, we would like to
perform another round of sampling at your property, possibly in the summer months. We
would like to keep the sampling points available for this re-sampling. We will contact
you again when planning for this future sampling event is further advanced to explain
what we intend to do and to request your concurrence. In the meantime, you should be
receiving regular Fact Sheets about site remediation activities to help keep you up to date
on what is happening.
Please feel free to contact me at 713-420-3425 if you would like any additional
information about the vapor intrusion evaluation process. As you know, EPNG is
working under the direction of USEPA. If you have any questions, please contact Ken
Mallary of USEPA at 404-562-8802 or Nile Testerman who is with the North Carolina
Department of Environment and Natural Resources (NCDENR) at 919-508-8482.
Sincerely,
{);,(jt11 j,.. [f-:,-f"-v,0:0,)
Brian S. Johnson
El Paso Natural Gas Company
cc: Janet McQuaid, EPNG
Jennifer Porter, Gurne Porter, PLLC
Ken Mallary, USEPA
Nile Testerman, NCDENR
Enclosure: Map of Sampling Locations; Tables I, Table 2, and Table 3
E ~ 0
'" M
;i;
5 u.
(9 z 0. ~ Ii'.
I
•
LEGEND
0 SEMI-PERMANENT SOIL GAS SAMPLE LOCATION 0 SEMI-PERMANENT PIEZOMETER LOCATION FOR GROUNDWATER SAMPLE
40
SCALE
•
I VP-18Ed
Z-18S
/
i /r
0 40
SAMPLE LOCATIONS FOR
1625 WEST FRONT STREET
FCX-STATESVILLE SUPERFUND SITE OU3 STATESVILLE, NORTH CAROLINA
80
FEET
134391.001,002 03/08
,Jj BROWN AND SJ CALDWELL Nashville, Tennessee
a:.__ ____________________ ..J. _______________ ..,1
•
Table 1
Shallow Soil Gas Results
1625 West Front Street
•
Volatile Organic
Compounds•
Results
1625 West Front Street
East
VP-18Es
mon 2/19/2008
ft/ 5-7
Tetrachloroethene (PCE) 1.4 u'
Trichloroethene (TCE) 1.1 U
cis-1,2-Dichloroethene (cDCE) µg/m3 0.79 U
Vinyl chloride µg/m3 0,51 U
Carbon tetrachloride 1.3 U
Chloroform µg/m3 0.98 U
1, 1-Dichloroethene µg/m3 0.79 U
1,2-Dichloropropane µglm3 0.92 U
Methylene chloride 0.69 U
1, 1,2-Trichloroethane µg/m3 1.1 U
Footnotes:
'Site-related voes as listed in Table 2 of the September 2006 Explanation of Significant Difference (ESD)
for FCX Operable Unit 3 (OU3).
'Units are in µg/m3 = micrograms per cubic meter
West
VP-18W
2/19/2008
5-7
1.4 U
1.1 U
0.79 U
0.51 U
1.3 U
0.98 U
0.79 U
0.92 U
0.69 U
1.1 U
'USEPA Screening Level is from the Target Shallow Soil Gas Concentration Corresponding lo Indoor Air Concentration
(soil gas lo indoor air attenuation factor of 0.1) from Table 2c and 3a-SG (1x10·0 risk is low range; 1x10·4 is high range)
in the USEPA OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils
(Subsurtace Vapor Intrusion Guidance) (2002)
'Direction (i.e., north, east, west, south} refers to the direction the sample is located adjacent to house.
' Feel below ground surface.
' Laboratory data qualifiers are as follows:
U means that the VOC was not identified in the sample above the concentration reporting limit.
Table 1 1625 W Front SG Shallow
•
Volatile Organic
Compounds a
Sam le Date
Sam le Interval
Tetrachloroethene (PCE)
Trichloroethene (TCE)
Table 2
Deep Soil Gas Results
1625 West Front Street
Unitsb
µg/m3
cis-1,2-Dichloroelhene (cDCE) µg/m3
Vinyl chloride
Carbon tetrachloride µg/m3
Chloroform
1, 1-Dichloroethene µg/m3
1,2-Dichloropropane µglm3
Methylene chloride µgtm3
1, 1,2-Trichloroethane µg/m3
Footnotes:
•
Results
1625 West Front
Street
East'
VP-18Ed
2118/2008
14-16
140 D'
11 UD
18 JD
5.1 UD
13 UD
27 JD
7.9 UD
9.2 UD
26 JD
30 JD
'Site-related VOCs as !isled in Table 2 of the September 2006 Explanation of Significant Difference (ESD)
for FCX Operable Unit 3 (OU3),
bUnits are in µg/m3 = micrograms per cubic meter
'USEPA Screening Level is from the Target Deep Soil Gas Concentration Corresponding to Indoor Air Concentration
(soil gas to indoor air attenuation factor of 0.01) from Table 2c and 3a-SG (1x10·• risk is low range; 1x1 o·• is high range)
in lhe USEPA OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils
(Subsurtace Vapor Intrusion Guidance) (2002)'"The attenuation factor of 0.01 is recommended for basements as
referenced by Department of Toxic Substances Control, California EPA Interim Final Guidance for the Evaluation and
Mitigation of Subsurtace Vapor Intrusion to Indoor Air, Revised February 7, 2005.
'Direction (i.e., north, east, west, south) refers to the direction the sample is located adjacent to house,
eFeet below ground surface.
1 Laboratory data qualifiers are as follows:
J means the the concentration was close to the reporting limit and is estimated.
The actual concentration could be slightly higher or lower.
U means that the VOC was not identified in the sample above the concentration reporting limit.
D means that the sample had high concentrations and was diluted for analysis
Table 1 1625 W Front Sg Deep
•
Volatile Organic
Compounds'
le Date
le Interval
Tetrachloroethene (PCE)
Trichloroethene (TCE)
Table 3
Groundwater Sample Results
1625 West Front Street
Unitsb
µg/L
µg/L
Groundwater
Performance
Standardsc
cis-1,2-Dichloroethene (cDCE) µg/L
Vinyl chloride µg/L
Carbon tetrachloride µg/L
Chloroform µg/L
1, 1-Dichloroethene µg/L
1,2-Dichloropropane µg/L
Methylene chloride µg/L
1, 1,2-Trichloroethane µg/L
Footnotes:
•
Results
1625 W Front St
PZ-18s
2119/2008
23-28
0.6
0.2 J'
0.8 U
0.1 U
0.3 J
0.8 U
0.8 U
0.1 U
2.0 U
0.8 U
'Sile-related voes as listed in Table 2 of the September 2006 Explanation ol Significant Difference
(ESD) for FeX Operable Unit 3 (OU3).
'Units are in µg/L = micrograms per liter
'Groundwater Performance Standards for site-related voes are listed in Table 2 of the September
2006 ESD for FeX OU3.
'Feet below ground surface
'Data qualifiers are as follows:
U means that the voe was not identified in the sample above the concentration reporting limit.
J means the the concentration was close lo the reporting limit and is estimated.
The actual concentration could be slightly higher or lower.
Table 2 1625 W Front St Water
• •
Communication Data Sheet
FCX-Statesville Superfund Site OU3
Date: Time:
Owner/Resident Name: Henry Elton Moore (Owner)
Address: 1623 W. Front Street
Phone number: 704-880-0644
Best Contact number:
Purpose of Meeting Discuss February 2008 Soil Gas & Groundwater Sampling Results
Documents left with owner/resident:
Documents shared but not left with owner/resident:
Content of Meeting:
Action Items for Follow-up:
Return visit?
Additional information to be mailed?
Follow-up phone call?
Other?
Personnel Conducting Meeting:
P:\Cllents\EI Paso\EPNG FCX\134391 -FCX Winter 2008 Vapor S.ampling\001-002\Communlcation Data Shects\Tanara Matthews.xis 4/2712008
•
A elpaso
April 28, 2008
Mr. Henry Elton Moore
P.O. Box 6471
Statesville, NC 28687
RE: I 623 West f'ront Street
•
I 00 I I ,ouisiana St1 c~t
l-lm1s1rn1, TX 77002
713-420-3827
FCX-Statesvillc Superfund Site Operable Unit 3, Statesville, NC (OU3 or site)
Dear Mr. Moore:
I am writing to follow up on the recent subsurface sampling that was performed as part of
a vapor intrusion evaluation at I 623 West Front Street. As you are aware, Brown and
Caldwell (BC), on behalf of El Paso Natural Gas Company (EPNG), installed
3 semi-permanent soil gas sampling points and I temporary groundwater sampling point
(piezometer) on the property on f'ebruary 13, 2008. One groundwater sample was
collected on February 20, 2008 from the piezometer, and on February I 9, 2008, BC
collected three soil gas samples from the soil gas points. The locations from which these
samples were taken are shown on the Sampling Location Map (attached).
These samples were collected because there arc volatile organic compounds (VOCs) in
the groundwater under houses in your area, including your house. The source of the
VOCs was explained in the letter EPNG sent to you on February 11, 2008. "Volatile"
means that VOCs can evaporate out of groundwater. Evaporated VOCs could move
through the soil gas into buildings above the groundwater. "Soil vapor or soil gas" arc
terms used to describe the gas or vapor contained in the soil above the groundwater.
This letter presents information on the laboratory results of the soil gas and groundwater
. samples and next steps proposed by EPNG.
Results of the Soil Gas Samples
Two VOCs identified as being present at the former Burlington Plant (now owned by
EPNG) were detected in the shallow soil gas samples from your property (refer to Table
1) and in the one deep soil gas sample (refer to Table 2). These VOCs are referred to in
this letter as "site related chemicals" or "site related VOCs." These two site related
chemicals are tetrachloroethcne, (also called perchlorocthylcne or PCE), and methylene
chloride; their concentrations are shown on Tables 1 and 2. These concentrations arc
Mr. Moore
J\pril 28, 2008
Page 2 of3
• •
below the screening levels the United States Environmental Protection Agency (USE!' A)
considers acceptable for soil gas, as discussed in more detail in this section.
The USEPA has established screening levels to evaluate whether concentrations ofVOCs
in the soil gas are a potential concern for people living in houses above the soil gas.
Tables I and 2 show the USEPA screening level and the sample rcsul! for each site
related VOC in soil ga~ at the three sampling points on your property.
The USEPA screening levels arc established within a range of concentrations that have
been <lctcnnined to be acceptable based on the potential for adverse health effects over a
lifetime, if one is exposed to that concentration for 30 years. USEPA uses this range to
determine if action is recommended to reduce potential exposure to the chemicals.
USEPA policy has determined that:
• For concentrations below the lowest acceptable concentration ( called the I o·6
level), the possibility of adverse health risks is extremely low or insignificant.
• For concentrations above the highest end of the range (called the 10·4 level),
action to reduce exposure or further investigation may be warranted.
For concentrations within the 1 o·6 to I 0·4 range, action may not be warranted
depending on the level of confidence in the results e.g. a high level of
confidence allows a higher acceptable level.
The concentrations of PCE and methylene chloride are below the 10·6 level that USEPA
considers acceptable, indicating that the VOCs in soil gas do not pose a concern to indoor
air.
Results of the Groundwater Sample
Only one VOC, chloroform, was identified in groundwater, as shown on Table 3. USFPA
has established a cleanup level, or performance standard, for VOCs in groundwater for
OU3. That cleanup level or performance standard is included in Table 3. These
performance standards assume that the groundwater is used for drinking. As you are
aware, there are no groundwater wells at the site (except for the piezometer that is not
used for any other purpose), and the City of Statesville supplies drinking water to the
neighborhood. Consequently, there is no exposure to VOCs from the groundwater.
Table 3 shows that the concentration of chloroform is below the perforrnance standard
level.
Mr. Moore
April 28, 2008
Page 3 of3
Next Steps
• •
On technical review, the data indicate that the concentrations of VOCs in soil gas pose
little concern for human health in indoor air on your property; however, to confirm that
the VOC results from this event are consistent and representative, we would like to
perform another round of sampling at your property, possibly in the summer months. We
would like to keep the sampling points available for this re-sampling. We will contact
you again when planning for this future sampling event is further advanced to explain
what we intend to do and to request your concurrence. In the meantime, you should be
receiving regular Fact Sheets about site remediation activities to help keep you up to date
on what is happening.
Please feel free to contact me at 713-420-3425 if you would like any additional
information about the vapor intrusion evaluation process. As you know, EPNG is
working under the direction ofUSEPA and if you have any questions about the results or
the comments in this letter, you may contact Ken Mallary of US EPA at 404-562-8802 or
Nile Testerman who is with the North Carolina Department of Environment and Natural
Resources (NCDENR) at 919-508-8482.
Sincerely,
. .p /l,lftvJ _}, . 0>-/w\iJ (' v\
Brian S. Johnson
El Paso Natural Gas Company
cc: Janet McQuaid, EPNG
Jennifer Porter, Gurne Pm1er, PLLC
Ken Mallary, USEPA
Nile Testerman, NCDENR
Enclosure: Map of Sampling Locations, Table 1, Table 2, and Table 3
~ ~ ;:I;
~
fr
CJ z a. ~ 00 8?.
I -~ ~
•
LEGEND
i? SHALLOW WELL LOCATION
INTERMEDIATE WELL LOCATION
DEEP WELL LOCATION
Q SEMI-PERMANENT SOIL GAS SAMPLE LOCATION
Q SEMI-PERMANENT PIEZOMETER LOCATION FOR
GROUNDWATER SAMPLE
Q GEOPROBE LOCATION FOR "GRAB" GROUNDWATER
SAMPLE (NOT PERMANENT POINT)
40
SCALE
•
0 40
SAMPLE LOCATIONS FOR
1623 WEST FRONT STREET
FCX-STATESVILLE SUPERFUND SITE OU3
STATESVILLE, NORTH CAROLINA
r-
80
FEET
134391.001.002 03/08
BROWN AND
CALDWEL,l_, Nushville, Tennesse!l a.L----------------------1.-----------------i
•
Table 1
Shallow Soil Gas Results
1623 West Front Street
•
Volatile Organic
Compounds•
Results
Units• 1623 West Front Street
Eastd
VP-19Es
2/19/2008
5-7
Tetrachloroethene (PCE) 5.0 J1
Trichloroethene (TCE) µg/m3 1.1 U
cis-1,2-Dichloroelhene (cDCE) µgim3 0.79 U
Vinyl chloride µg/m3 0.51 U
Carbon tetrachloride 1.3 U
Chloroform µgim3 0.98 U
1, 1-Dichloroelhene µgim3 0.79 U
1,2-Dichloropropane 0.92 U
Methylene chloride 1.2 J
1, 1,2-Trichloroethane µg/m 3 1.1 U
Footnotes:
'Site-related voes as listed in Table 2 of the September 2006 Explanation of Significant Difference (ESD)
for FCX Operable Unit 3 (OU3).
'Units are in µg/m3 = micrograms per cubic meter
West
VP-19W
2/19/2008
5-7
4.3 J
1.1 U
0.79 U
0.51 U
1.3 U
0.98 U
0.79 U
0.92 U
2.3 J
1.1 U
'USEPA Screening Level is from the Target Shallow Gas Concentration Corresponding to Indoor Air Concentration
(soil gas to indoor air attenuation factor of 0.1) from Table 2c and 3a-SG (1x10'6 risk is low range; 1x10·4 is high range)
in the USEPA OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils
(Subsurface Vapor Intrusion Guidance) (2002)
'Direction (i.e., north, east, west, south) refers to the direction the sample is located adjacent to house.
'Feet below ground surface.
1 Laboratory data qualifiers are as follows:
J means the the concentration was close to the reporting limit and is estimated.
The actual concentration could be slightly higher or lower.
U means that the VOC was not identified in the sample above the concentration reporting limit.
Table 1 1623 \IV Front St Vapor Shallow
•
Volatile Organic
Compounds•
Table 2
Deep Soil Gas Results
1623 West Front Street
•
i/:Low/~arige} !High\Rarige:, East
11------------+-------f s':WK001*---~JvJPJ-1J9,,,E~~dif _-----11
1
1
Sam le Date mon v1m~
Sam le Interval Wb ~10
Tetrachloroethene (PCE) µg/m' 18
Trichloroethene (TCE) µg/m3 1.1 u'
cis-1,2-Dichloroethene (cDCE) µg/m3 0.79 U
Vinyl chloride 0.51 U
Carbon tetrachloride 1.3 U
Chloroform µg/m3 0.98 U
1, 1-Dichloroethene µg/m3 0.79 U
1,2-Dichloropropane µg/m3 0.92 U
Methylene chloride µg/m3 1.3 J
1, 1,2-Trichloroethane µg/m3 1.1 U
Footnotes:
'Site-related VOCs as listed in Table 2 of the September 2006 Explanation of Significant Difference (ESD)
for FCX Operable Unit 3 (OU3).
'Units are in µglm3 = micrograms per cubic meter
'USEPA Screening Level is from lhe Target Deep Soil Gas Concentration Corresponding lo Indoor Air Concentration
(soil gas to indoor air attenuation factor of 0.01) from Table 2c and 3a-SG (1x10"6 risk is low range: 1x10·• is high range)
in the USEPA OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils
(Subsurface Vapor Intrusion Guidance) (2002)"The attenuation factor of 0.01 is recommended for basemenls as
referenced by Deparlment of Toxic Suostances Control, California EPA lnlerim Final Guidance for the Evaluation and
Mitigation of Subsurface Vapor Intrusion to Indoor Air, Revised February 7, 2005.
'Direction (i.e., north, east, west, south) refers to the direction the sample is located adjacent to house.
'Feet below ground surface.
1 Laboratory data qualifiers are_as follows:
J means the the concentration was close lo the reporting limit and is estimated.
The actual concentralion could be slighlly higher or lower.
U means that the VOC was not identified in the sample above the concentration reporling limit.
Table 1 1623 W Front St Vapor Deep
• •
Volatile Organic
Compounds•
Sam le Interval
Tetrachloroethene (PCE)
Trichloroethene (TCE)
Table 3
Groundwater Sample Results
1623 West Front Street
Unitsb
µg/L
µg/L
Groundwater
Performance
Standards'
cis-1,2-Dichloroethene ( cDCE) µg/L
Vinyl chloride µgll
Carbon tetrachloride µg/L
Chloroform µg/L
1, 1-Dichloroethene µg/L
1,2-Dichloropropane µg/L
Methylene chloride µg/L
1, 1,2-Trichloroethane µg/L
Foolnotes:
Results
1623 W Front St
PZ-19s
2/20/2008
20-25
0.1 U
0.1 U'
0.8 U
0.1 U
0.1 U
3 0 J
0.8 U
0.1 U
2.0 U
0.8 U
'Site-related voes as !isled in Table 2 of the September 2006 Explanation of Significant Difference
(ESD) for FeX Operable Unit 3 (OU3).
'Units are in µg/L = micrograms per liter
'Groundwater Performance Standards for site-related voes are listed in Table 2 of the September
2006 ESD for FeX OU3.
'Feet below ground surface
'Data qualifiers are as follows:
U means that the VOC was not identified in the sample above the concentration reporting limit.
Table 2 1623 W Front St Water
Date:
Owner/Res·1dent Name:
Address:
Phone number:
Best Contact number:
Purpose of Meeting:
• •
Communication Data Sheet
FCX-Statesville Superfund Site OU3
Time:
Stephanie Davis (Tenant)
1623 W. Front Street
vi,:,y I
;it" /Jc-iv..s
Discuss February 2008 Soil Gas & Groundwater Sampling Results
Documents left with owner/resident:
Documents shared but not left with owner/resident: pJ A ---'--------------------
Content of Meeting:
V
Action Items for Follow-up:
Return visit?
Additional information to be mailed?
Follow-up phone call?
Other?
Personnel Conducting Meeting:
P:\Clients\E.l Paso\EPNG FCX\134391 . FCX Winier 2008 Vapor Sompffng\001·002\Communication Data Sheets\Oav!s.xls 412712008
• •
A elpaso
April 28, 2008
Ms. Stephanie Davis
I 623 West Front Street
Statesville, NC 28677
RE: 1623 West Front Street
•
10011,nuisi,maSlrcc!
Hou~lcm, TX 77002
713-420-3827
FCX-Statesvillc Superfund Site Operable Unit 3, Statesville, NC (OU3 or site)
Dear Ms. Davis:
I am writing to follow up on the recent subsurface sampling that was performed as part of
a vapor intrusion evaluation at 1623 West Front Street. As you arc aware, Brown and
Caldwell (BC), on behalf of El Paso Natural Gas Company (EPNG), installed
3 semi-permanent soil gas sampling points and I temporary groundwater sampling point
(piczomcter) on the prope11y on February 13, 2008. One groundwater sample was
collected on February 20, 2008 from the piczomcter, and on February 19, 2008, BC
collected three soil gas samples from the soil gas points. The locations from which these
samples were taken arc shown on the Sampling Location Map (attached).
These samples were collected because there arc volatile organic compounds (VOCs) in
the groundwater under houses in your area, including your house. The source of the
VOCs was explained in the letter EPNG sent to you on February 11, 2008. "Volatile"
means that VOCs can evaporate out of groundwater. Evaporated VOCs could move
through the soil gas into buildings above the groundwater. "Soil vapor or soil gas" arc
terms used to describe the gas or vapor contained in the soil above the groundwater.
This letter presents information on the laboratory results of the soil gas and groundwater
samples and next steps proposed by EPNG.
Results of the Soil Gas Samples
Two VOCs identified as being present at the former Burlington Plant (now owned by
EPNG) were detected in the shallow soil gas samples from your property (refer to Table
1) and in the one deep soil gas sample (refer to Table 2). These VOCs arc referred to in
this letter as "site related chemicals" or "site related VOCs." These two site related
chemicals are tetrachlorocthene, (also called pcrchloroethylene or PCE), and methylene
chloride; their concentrations arc shown on Tables I and 2. These concentrations arc
Ms. Davis
April 28, 2008
Page 2 of3
• •
below the screening levels the United States Environmental Protection Agency (USEPA)
considers acceptable for soil gas, as discussed in more detail in this section.
The USEPA has established screening levels lo evaluate whether concentrations ofVOCs
in the soil gas are a potential concern for people living in houses above the soil gas.
Tables I and 2 show the USEPA screening level and the sample result for each site
related VOC in soil gas at the three sampling points on your property.
The USEPA screening levels are established within a range of concentrations that have
been determined to be acceptable based on the potential for adverse health effects over a
lifetime, if one is exposed to that concentration for 30 years. USEPA uses this range to
determine if action is recommended to reduce potential exposure to the chemicals.
USEPA policy has determined that:
• For concentrations below the lowest acceptable concentration (called the Io-<>
level), the possibility of adverse health risks is extremely low or insignificant.
• For concentrations above the highest end of the range ( called the I 0-4 level),
action to reduce exposure or further investigation may be warranted.
• For concentrations within the I o-6 to I 04 range, action may not be warranted
depending on the level of confidence in the results e.g. a high level of
confidence allows a higher acceptable level.
The concentrations of !'CE and methylene chloride are below the I o-6 level that \JSEPA
considers acceptable, indicating that the VOCs in soil gas do not pose a concern to indoor
all'.
Results of the Groundwater Sample
Only one VOC, chloroform, was identified in groundwater, as shown on Table 3. US EPA
has established a cleanup level, or performance standard, for VOCs in groundwater for
OU3. That cleanup level or performance standard is included in Table 3. These
performance standards assume that the groundwater is used for drinking. As you are
aware, there are no groundwater wells at the site (except for the piezometer that is not
used for any other purpose), and the City of Statesville supplies drinking water to the
neighborhood. Consequently, there is no exposure to VOCs from the groundwater.
Table 3 shows that the concentration of chloroform is below the perfo1:mance standard
level.
Ms. Davis
April 28, 2008
Page 3 of3
Next Steps
• •
On technical review, the data indicate that the concentrations of VOCs in soil gas pose
little concern for human health in indoor air on your property; however, to confirm that
the VOC results from this event are consistent and representative, we would like to
perform another round of sampling at your property, possibly in the summer months. We
would like to keep the sampling points available for this re-sampling. We will contact
you again when planning for this future sampling event is fmther advanced lo explain
what we intend to du and to request your concurrence. In the meantime, you should be
receiving regular Fact Sheets about site remediation activities to help keep you up to date
on what is happening.
Please feel free to contact me at 713-420-3425 if you would like any additional
information about the vapor intrusion evaluation process. As you know, EPNG is
working under the direction of US EPA and if you have any questions about the results or
the comments in this letter, you may contact Ken Mallary ofUSEPA at 404-562-8802.or
Nile Testerman who is with the North Carolina Department of Environment and Natural
Resources (NCDENR) at 919-508-8482.
Sincerely,
" Y-l /\~b-,1 .~
Brian S. Johnson
El Paso Natural Gas Company
cc: Janel McQuaid, EPNG
Jennifer Po11er, Gurne Porter, PLLC
Ken Mallary, USEPA
Nile Testerman, NCDENR
Enclosure: Map of Sampling Locations, Table 1, Table 2, and Table 3
iii ;;;
~ [r
(9
I[
~ &
I • ~
•
LEGEND
1l SHALLOW WELL LOCATION
(,:, INTERMEDIATE WELL LOCATION ,t, DEEP WELL LOCATION
0 SEMl,PERMANENT SOIL GAS SAMPLE LOCATION 0 SEMl,PERMANENT PIEZOMETER LOCATION FOR GROUNDWATER SAMPLE 0 GEOPROBE LOCATION FOR 'GRAB" GROUNDWATER SAMPLE (NOT PERMANENT POINT)
40
SCALE
•
0 40
SAMPLE LOCATIONS FOR
1623 WEST FRONT STREET
FCX-STATESVILLE SUPERFUND SITE OU3 STATESVILLE, NORTH CAROLINA
,-...
80
FEET
134391.001.002 03/08
BROWN AND
CALT)WELJ_, Nushville, T,mnosseu a.L---------------------..J.---------------..
•
Table 1
Shallow Soil Gas Results
1623 West Front Street
•
· Results Volatile Organic
Compounds• 1623 West Front Street
East•
VP-19Es
mon 2/19/2008
ftlb 5-7
Tetrachloroethene (PCE) µg/m3 5.0 J1
Trichloroethene (TCE) µg/m3 1.1 U
cis-1,2-Dichloroethene (cDCE) µg/m3 0.79 U
Vinyl chloride µg/m3 0.51 U
Carbon tetrachloride µg/m 3 1.3 U
Chloroform µg/m3 0.98 U
1, 1-Dichloroethene µg/m3 0.79 U
1,2-Dichloropropane µg/m3 0.92 U
Methylene chloride µg/m3 1.2 J
1, 1,2-Trichloroethane µg/m 3 1.1 U
Footnotes:
'Site-related VOCs as listed in Table 2 of the September 2006 Explanation of Significant Difference (ESD)
for FCX Operable Unit 3 (OU3).
'Units are in µg/m3 = micrograms per cubic meter
West
VP-19W
2/19/2008
5-7
4.3 J
1.1 U
0.79 U
0.51 U
1.3 U
0.98 U
0.79 U
0.92 U
2.3 J
1.1 U
'USEPA Screening Level is from the Target Shallow Gas Concentration Corresponding to Indoor Air Concentration
(soil gas to indoor air attenuation factor of 0.1) from Table 2c and 3a-SG (1 x10-6 risk is low range; 1 x10'4 is high range)
in the USEPA OSWER Draft Guidance for Evaluating lhe Vapor Intrusion lo Indoor Air Pathway from Groundwater and Soils (Subsurface Vapor Intrusion Guidance) (2002)
'Direction (i.e., north, east, west, south) refers lo the direction lhe sample is localed adjacent to house.
'Feet below ground surface.
1 Laboratory data qualifiers are as follows:
J means the the concentration was close to the reporting limit and is estimated.
The actual concentration could be slightly higher or lower.
U means that the VOC was not identified in the sample above the concentration reporting limit.
Table 1 1623 W Front SI Vapor Shallow
•
Volatile Organic
Compounds•
Tetrachloroethene (PCE)
Trichloroethene (TCE)
cis-1,2-Dichloroethene (cDCE)
Vinyl chloride
Carbon tetrachloride
Chloroform
1, 1-Dichloroethene
1,2-Dichloropropane
Methylene chloride
1, 1,2-Trichloroethane
Footnotes:
Table 2
Deep Soil Gas Results
1623 West Front Street
Units•
µg/m'
µg/m3
µg/m3
µg/m3
µg/m3
•
Results
1623 West Front
Street
East
VP-19Ed
2/19/2008
8-10
18
1.1 u'
0.79 U
0.51 U
1.3 U
0.98 U
0.79 U
0.92 U
1.3 J
1.1 U
'Site-related voes as listed in Table 2 of the September 2006 Explanation of Significant Difference (ESD)
for FCX Operable Unit 3 {OU3).
'Units are in µg/m3 = micrograms per cubic meter
'USEPA Screening Level is from the Target Deep Soil Gas Concentration Corresponding to Indoor Air Concentration
{soil gas to indoor air attenuation factor of 0.01) from Table 2c and 3a-SG {1x1 o·' risk is low range; 1 x10'4 is high range)
in the USEPA OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils
{Subsurface Vapor Intrusion Guidance) {2002)"The attenuation factor of 0.01 is recommended for basements as
referenced by Department of Toxic Substances Control, California EPA Interim Final Guidance for the Evaluation and
Mitigation of Subsurface Vapor Intrusion to Indoor Air, Revised February 7, 2005.
'Direction {i.e., north, east, west, south) refers to the direction the sample is located adjacent lo house.
'Feet below ground surface.
' Laboratory data qualifiers are as follows:
J means the the concentration was close to the reporting limit and is estimated.
The actual concentration could be slightly higher or lower.
U means that the VOC was not identified in the sample above the concentration reporting limit.
Table 1 1623 W Front St Vapor Deep
c, •
Volatile Organic
Compounds•
Sam le Date
Sam le Interval
Tetrachloroethene (PCE)
Trichloroethene (TCE)
Table 3
Groundwater Sample Results
1623 West Front Street
Units" Groundwater
Performance
Standardsc
µg/L
µg/L
cis-1,2-Dichloroelhene (cDCE) µg/L
Vinyl chloride µg/L
Carbon tetrachloride µg/L
Chloroform µg/L
1, 1-Dichloroethene µg/L
1,2-Dichloropropane µg/L
Methylene chloride µg/L
1, 1,2-Trichloroethane µg/L
Footnotes:
Results
1623 W Front St
PZ-19s
2120/2008
20-25
0.1 U
0.1 U •
0.8 U
0.1 U
0.1 U
3.0 J
0.8 U
0.1 U
2.0 U
0.8 U
'Site-related voes as listed in Table 2 of the September 2006 Explanation of Significant Difference
(ESD) for FeX Operable Unit 3 (OU3).
'Units are in µg/L = micrograms per liter
'Groundwater Performance Standards for site-related voes are listed in Table 2 of the September
2006 ESD for FeX OU3.
'Feet below ground surface
'Data qualifiers are as follows:
U means that the voe was not identified in the sample above the concentration reporting limit.
Table 2 1623 W Front St Water