NCD991278953_20090414_National Starch & Chemical Corp._FRBCERCLA RD_Response to Comments on the OU-4 Remedial Design Work Plan-OCR

~ARCADIS
Infrastructure, environment, buildings
Mr. Jon Bornholm
Remedial Project Manager
U.S. Environmental Protection Agency
Region IV
61 Forsyth Street, SW
Atlanta, Georgia 30303
Subject:
~~:; ~'.!, "1~
SUPERFUND SECTION
Response to Comments on the OU4 Remedial Design Work Plan
National Starch & Chemical Company Superfund Site
Salisbury, Rowan County, North Carolina
Dear Mr. Bornholm:
On behalf of AkzoNobel SPG LLC, AR CAD IS is please to provide the following
responses to your comments dated January 23, 2009 regarding the above
referenced report for the former National Starch & Chemical Company Superfund
Site located on Cedar Springs Road in Salisbury, North Carolina.
1. Title of Document: Should the title of this document actually be "OU4 Remedial
Action Work plan -Preliminary Submittal"? It is my understanding that EPA has
already approved the Remedial Design.
Response to EPA 1 . Yes, the Remedial Design was approved per
correspondence from the EPA dated September 17, 2008.
2. Page 2-1, Section 2-1 Submittals: A schedule should accompany this list of
deliverables (i.e., for each documenVbullet listed).
Response to EPA 2. The schedule is revised continuously as the project
progresses and is submitted monthly with the monthly progress report.
3. Page 2-1, Section 2-1 Submittals, first bullet: Is an intermediate design
necessary? Can we go directly from "Preliminary" to "Pre-Final" and then to
"Final"?
Response to EPA 3. The next submittal will be the "Final" design.
ARCADIS
30 Patewood Drive
Suite 155
Greenville
South Carolina 29615
Tel [phone]
Fax [phone]
www.arcadis-us.com
Environmental
Date:
April 14, 2009
Contact:
Elizabeth L. Rhine
Phone:
864.987.3906
Email:
Elizabeth.rhine@arcadi
s-us.com
Our ref:
80060013.0001
ARCADIS
4. Page 2-2, Section 2-2 Reports, last paragraph: I would like to propose that the
monthly progress reports be submitted by the fifth of each month electronically
(pdf format is acceptable).
Response to EPA 4.
month.
Progress reports now being sent via email by the 5th of each
5. Page 3-2, Section 3-2 Basis of Change from OU4 Record of Decision: The OU4
Record of Decision (ROD) did not require horizontal extraction wells. Section
8.1.3 ALTERNATIVE S3: Soil Vapor Extraction with Fume Incineration and
Activated Carbon Filter to Control Emissions of the ROD does included language
about the soil vapor extraction system including 10 horizontal soil vapor
extraction wells; however, neither the DESCRIPTION OF THE SELECTED
REMEDY section of the DECLARATION FOR THE RECORD OF DECISION nor
Section 10 DESCRIPTION OF THE SELECTED REMEDY require horizontal
wells. These sections of the ROD only require the installation and
implementation of a soil vapor extraction system.
Response to EPA 5. Agreed.
6. Page 3-3, Section 3-2 Basis of Change from OU4 Record of Decision, Results of
OU4 NOTS indicate mass of COCs less widespread than the Remedial
Investigation reported.: This change does not require a modification to the ROD.
Response to EPA 6. Agreed.
7. Page 3-3, Section 3-2 Basis of Change from OU4 Record of Decision, Impacts
to groundwater from OU4 soil is mitigated through OU3 remedy selection and
widespread impervious surfaces., the sentence that carries over to the next
page: This sentence states "Further investigation and remedial design activities
have identified ... ". The text of this sentence needs to be expanded to identify
each effort (the further investigation and remedial design activities) and in what
report, including the date of the report, these findings/results were reported in.
Response to EPA 7. This sentence was take from a prior report, but could not be
substantiated by any of the documents on file in our office. For this reason, field
personnel are conducting thorough screening of cuttings during the installation of
the SVE wells and the deeper air venting wells. The screening process includes
both the use of a photoionization detector (PID) and the use of hydrophobic dye
to determine if NAPL is present. Note that bailer tests were conducted on
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February 28, 2009 in six monitoring wells (NS-39, NS-47, NS-54, NS-57, EX-5T,
EX-9) where the highest concentrations of dissolved VOCs were detected.
DNAPL was not observed when hydrophobic dye (Oil Red 0) was added to
groundwater removed from the bottom of the well.
8. Page 3-4, Section 3-3 Changes to the OU4 Record of Decision, second
sentence: This sentence states a limited soil removal effort will take place. This
will require an administrative change to the ROD.
Response to EPA 8. Soil is not being removed for remediation purposes, but as a
necessity during implementation of the SVE system. Soil must be removed to
allow installation of the vacuum and air supply lines. Furthermore, the existing
soil under the driveway is not suitable and caused the original driveway to crack.
For geotechnical reasons, soil must be removed and replaced with fill that can
achieve 95% compaction required for the concrete design. Since there is a
possibility that these soils may have impacts, they will be handled accordingly.
However, it should not require an administrative change to the ROD.
9. Page 3-4, Section 3-3 Changes to the OU4 Record of Decision, second
sentence: What will be done with the excavated soils?
Response to EPA 9. The soils will be stockpiled on plastic sheeting until a
determination regarding future use is made. Samples will be collected for VOC
analysis every 100 cubic yards. Concrete may be re-used if it meets the
beneficial reuse requirements specified in NC regulations requirements.
Removed soil will be disposed of at an off-site landfill. Prior to concrete
beneficial reuse and off-site soil disposal, ARCADIS will submit the details
supporting the reuse and disposal plans as required in the UAO.
10. Page 4-2, Section 4-2 OU4 Conceptual Model: Aren't the soils in the vicinity of
the solvent recovery system (distillation unit) also highly contaminated?
Response to EPA 10. Yes, the soils in the vicinity of the distillation are also
impacted and will be treated by the SVE system.
11. Page 4-2, Section 4-2 OU4 Conceptual Model, first paragraph, third sentence:
This sentence states the terra cotta line was removed. It was my understanding
that the line was grouted in place.
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Response to EPA 11. The terracotta wastewater line was abandoned in-place under
the Reactor Room in Area 2 and under the road just north of the Room.
12. Page 4-2, Section 4-2 OU4 Conceptual Model, second paragraph, second bullet:
Refer to comment #1 0 above.
Response to EPA 12. See Response to Comment 11.
13. Page 4-2, Section 4-2 OU4 Conceptual Model, second paragraph, second bullet,
the sentence that carries over to next page: The Agency questions whether or
not "hydraulic control" has been achieved.
Response to EPA 13. The response to comments on the 2007 Site Monitoring
Report addresses this question regarding the capture zone of the OU4 extraction
system. For convenience, attached is the revised potentiometric map of the
shallow bedrock depicting the capture zone of the extraction system during
active pumping. As the extraction system is brought back on line, the capture
zone will continue to be evaluated and maximized.
14. Page 4-3, Section 4-2 OU4 Conceptual Model, second bullet on page: How old
are these observations? Are they still applicable?
Response to EPA 14. It is true that concentrations of DCA in some groundwater
monitoring wells exceed 1 % of the solubility. However, no direct evidence of
DNAPL has been observed and documented. See Response to Comment 7.
15. Page 4-3, Section 4-2 OU4 Conceptual Model, third bullet on page: What has
been or what will be done to address the concern highlighted in this bullet?
Response to EPA 15. The SVE system design takes into account the multiple
horizons in which voes are observed at varying concentrations. The addition of
air into the deeper vadose zone-will facilitate the extraction of vapors closer to
the surface. The system design is flexible. If necessary, the air injection wells
can be easily converted for use as vacuum extraction wells to remove vapors
from the deeper interval, provided the water table does not rise into the screened
interval.
16. Page 4-3, Section 4-2 OU4 Conceptual Model, fourth bullet on page, last
sentence: Refer to comment #13 above regarding hydraulic control.
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ARCADIS Mr. Jon Bornholm
April 14, 2009
Response to EPA 16. See Response to Comments 7 and 13, above.
17. Page 5-1, Section 5-2 Pilot Test Layout, first paragraph, second sentence: Why
was VEW-1 installed only 20 feet below ground surface? Why not deeper?
What is the depth of groundwater in this area of the Site?
Response to EPA 17. The location of the primary test well (VEW-1) was selected
to intersect a historical area were DCA had been detected at the high
concentrations (-200 mg/kg) and at depths (-15 bis) where excavation would
not be feasible. Top of rock at air venting well AV-2 is 28 feet bis; top of rock at
NS-59 is 27.5 feet bis. Groundwater is not observed at AV-2; groundwater is
observed at 27 feet bis at NS-59. Based on previous boring logs, groundwater is
not believed to exist in the overburden in the area where pilot testing was
conducted at VEW-1.
18. Page 5-1, Section 5-2 Pilot Test Layout, first paragraph, last sentence: Why
were the vapor monitoring points constructed differently?
Response to EPA 18. Two depths were selected to evaluate the impact of the SVE
technology on varying vertical soil column conditions.
19. Pages 5-1 through 5-3, Sections 5.2.1 through 5.2.4: Why isn't VM-1 included in
this decision?
Response to EPA 19. The short distance between the source well and VM-1
discounted this data point.
20. Page 5-3, Section 5.2.4 Data Analysis, third bullet: Any thought as to why there
was poor hydraulic connectivity between VEW-1 and VM-2?
Response to EPA 20. Poor hydraulic connectivity between these vapor monitoring
wells could be due to the presence of clay lenses, the presence of preferential
pathways, possible poor well construction, etc;
21. Page 5-3, Section 5.3.2 Air Emissions Sampling, third sentence: This sentence
states that the initial PID readings peaked and then declined to a steady-state
value of 60 parts per million. What was the timeframe for this change?
Response to EPA 21. From Figure 5, approximate elapsed time to reach steady-
state PID off-gas levels was six hours.
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22. Page 5-4, Section 5.3:3 Data Analysis, second paragraph, first bullet: This bullet
highlights that there was a difference in contaminant concentrations in the off-
gas between the March 2008 and November 2008 tests. Any thoughts as to
why this difference occurred?
Response to EPA 22. Most likely, the initial SVE test removed vapors that had
accumulated under the concrete pad over a period of many years, and
represents a worse-case scenario for initial soil vapor extraction. There is also a
possibility that the March test gas samples were collected with liquid in the
knockout tank which could have contained elevated levels of DCA. It is further
possible that the March lab results were incorrectly calculated and reported
(over-diluted) by the laboratory, although the laboratory has been asked to verify
the results on several occasions and has concluded that the results are
accurate. The repeatability of the November data provides more confidence and
is more typical for SVE systems in the North Carolina Piedmont (upper limit of
1,000 ppmv). Since the March data were not reproducible, the SVE design was
based on the November data.
23. Page 5-4, Section 5.3.3 Data Analysis, second paragraph, last bullet: This bullet
states the VOC recovery rate at 25 standard cubic feet per minute (scfm) will be
6.5 pounds/day (lbs/d). The last bullet on page 5-3, Section 5.2.4 Data Analysis
states that the voe recovery rate will be 120 lbs/d at 25 scfm. Which rate is
being used when moving this project forward?
Response to EPA 23. The higher value (120 ppd) was determined from the
irreproducible March data. The lower number corresponds to the November
laboratory emission reports and is the basis for the design moving forward.
24. Page 5-5, Section 5-4 Conclusions, second bullet: Since the results of the
screen interval were inconclusive, how is this information being used to move
the project forward?
Response to EPA 24. The effective radius used for the design was reduced from
field determined value of -50 feet (-1-in we) to a more conservative value of 30
feet. This was also a driver in determination to use active venting to assist in the
effectiveness of the SVE technology.
25. Page 6-1, Section 6-1 Wastewater Collection System Improvements, third
paragraph, third sentence: This sentence implies materials that will be used to
construct the trench have not been selected. Is there going to be a vast change
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in the chemicals used in the future versus what chemicals were used in the past
at the NSCC facility?
Response to EPA 25. To the best of our knowledge, no significant changes in the
types of chemicals to be used at the plant are projected in the near future.
26. Page 6-3, Section 6-4 Road/Pad Replacement and Soil Removal, second
paragraph, last sentence: This sentence states that a sample will be collected for
every 35 cubic yards. Are large pieces of concrete going to be segregated by
themselves? If so, how will these pieces of concrete be sampled?
Response to EPA 26. Concrete will be broken into table-top sized pieces and
samples of concrete will be ground and analyzed for the constituents of concern
for beneficial reuse.
27. Page 6-3, Section 6-4 Road/Pad Replacement and Soil Removal, third
paragraph: Please be aware that EPA has a policy that requires that all
contaminated waste being removed from a Superfund Site to be deposed of at a
facility in good standing with EPA. Therefore, it is important that once
NSCC/Arcadis identifies the facility to receive this soil/debris that the pertinent
information about this facility be shared with EPA in a timely fashion to ensure
that this facility is in good standing with EPA.
Response to EPA 27. NSCC/ARCADIS will follow requirements in the UAO and
EPA/NCDENR request.
28. Page 6-4, Section 6-5 SVE System Installation, third paragraph, second
sentence: This sentence states that most vacuum wells will be drilled to a depth
of 15-feet? What is the rationale for 15-feet? What criteria will be used to install
a vacuum well either deeper or shallower that 15-feet?
Response to EPA 28. Review of soil boring logs indicated the majority of borings
already performed in OU4 area had reached a zone of higher permeability by
15-feet in depth. Shallower SVE wells will be considered if auger refusal is
encountered. Air venting wells will be installed deeper and will have the design
flexibility to be converted into SVE wells should vapor extraction at depth be
desired.
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29. Page 6-5, Section 6-6 Air Injection System Installation, third paragraph,
sentence that carries over to the next page: What is the.rationale for a maximum
depth of 30-feet for the in-situ air sparging (IAS) wells?
Response to EPA 29. Similar to the SVE wells, review of the soil boring logs and
well installation logs indicated that hollow-stem auger refusal had typically
occurred within 30-feet of surface of the OU4 area. Wells AS-2 through 10 have
already been installed, and refusal was encountered between 8.6 feet bis (AS-9)
and 30 feet bis (AS-10).
30. Page 6-6, Section 6-8 Off-Gas Treatment: The following language is from the
OU4 ROD, "The extracted contaminated air from Area 2 will initially be treated
using fume incineration to destroy the volatile organics prior to the air stream
being released into the atmosphere. After concentrations of contaminants
decrease in the extracted air, this contaminated vapor will be treated via vapor-
phase activated carbon adsorption filters. The extracted contaminated air from
the lagoon area will be treated using vapor-phase activated carbon adsorption
filters to remove the volatile organics prior to the air stream being released into
the atmosphere." If NSCC/Arcadis selects condensation and off-site recovery as
the preferred method for dealing with the soil vapor extraction off-gas, then EPA
will need to implement an administrative change to the ROD. In order for EPA to
accomplish this administrative change, NSCC/Arcadis will need to perform a
focused Feasibility Study in support of the selection of condensation and off-site
recovery.
Response to EPA 30. lnitally, off-gas treatment will be conducted through catalytic
oxidation. As the off-gas concentration decreases, this will likely be replaced
with vapor-phase carbon adsorption. It is anticipated that the cat-ox system will
be used for 12 to 18 months. The lagoon area SVE off-gas is still planned to be
processed with vapor-phase carbon adsorption, should SVE still be necessary in
this area, pending additional soil investigation.
In addition to the comments above, NSCC/Arcadis will need to address the
following two issues:
1) What efforts/procedures are going to be implemented/developed to
measure/deal with the rebound effect of contaminant concentrations in
the soil/soil vapor over time? How/when will soil vapors concentrations
be measured?
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Response 1) Since little adsorption to soil is expected and 1,2-DCA has a
relatively high Henry's Law constant (9.77 x 10·' atm-m3/mole), air
samples will be used to monitor the effectiveness of remedy. System
off-gas samples will be collected during regular operation of the
remediation system. Monitoring will include weekly sampling and field
analysis using a PIO or FID and monthly gas samples collected and
analyzed in accordance with established EPA protocols such as T0-15.
After six months of asymptotic conditions are measured, the system will
be shutdown for a minimum of two months. At that time, the system will
be restarted, and Summa canister samples will be collected from a
representative number of SVE wells and analyzed by T0-15.
2) Does the design define the performance verification requirements (i.e.,
How long after the SVE system is shut-down will samples be collected to
insure clean-up goals have been achieved? What type of sampling will
be done (air or soil)?) Has a comparison been developed between what
concentration (micrograms per cubic meter) of 1,2-dichloroethane (1,2-
DCA) in the soil vapor extraction off-gas relates to a concentration of 169
micrograms per kilogram (ug/kg) in the soil?
Response 2) In order to protect the integrity of the new concrete pad, air
sampling methods will be used to monitor the effectiveness of the SVE
system as described above. The data will be compared to the average
asymptotic level achieved prior to shut down. Should sampling indicate
concentrations greater than 15% of the average concentration observed
prior to shut down, the system will be restarted and the cycle repeated at
one-month intervals until asymptotic levels are maintained in soil vapor.
Once sampling indicates soil vapor C<;>ncentrations similar to or less than
the average asymptotic level, a select number of SVE injection wells will
be sacrificed for the purpose of collecting soil samples. Using a drill bit,
the bottom cap of the well will be drilled out to allow access to the soil
beneath. A soil sample will be collected approximately 2 feet below the
bottom of the well and analyzed for voes. If the soil sample meets the
performance standards specified in the ROD, remediation will be
considered complete. In the event performance standards are not met,
NSCC and ARCADIS will involve the agency and NCDENR in developing
alternatives.
There have been published methods for correlating concentrations in soil
gas to concentrations in the soil matrix. However, our experience with
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this method of estimating the concentration in soil from soil vapor
indicates that too many variables exist to make an accurate correlation.
Soils in the Piedmont in particular are quite heterogeneous, making this
method for predicting soil concentrations unreliable. ·
With respect to comments received from David Mattison with the NCDENR
Superfund Section, the following responses are offered:
Table of Contents
1. Please ensure that the list of tables and the list of figures contained in
the Table of Contents accurately reflect the titles of the respective table
and/or figure.
NCDENR Response 1. Agreed.
Section 1.0 Introduction
2. Please correct the first sentence of Section 1.0 to state " ... preliminary
design for implementing the remediation of Operable Unit 4 (OU4) ... "
NCDENR Response 2. Agreed.
Section 5.2.2 Field Measurements
3. Please correct the second sentence of Section 5.2.2 to state "The field
notes from this pilot test can be found in Appendix D."
NCDENR Response 3. Agreed.
Section 5.2.3 Air Emissions Sampling
4. Please correct the third sentence of Section 5.2.3 to state" ... at the
completion of Test 3 to evaluate influent concentrations at a different
screened interval. .. "
NCDENR Response 4. Agreed.
5. Please correct the last sentence of Section 5.2.3 to state" .. and the
complete laboratory analytical is included in Appendix B."
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NCDENR Response 5. Agreed.
Section 5.3.2 Air Emissions Sampling
6. Please correct the last sentence of the first paragraph of Section 5.3.2 to
state "Appendix C includes the laboratory test reports ... "
NCDENR Response 6. Agreed.
Section 5.3.3 Data Analysis
7. Please provide details of the calculations used to derive the total volatile
organic compound (VOC) recovery rate given in the last bullet item of
Section 5.3.3.
NCDENR Response 7. The equation for determining mass emission rate from SVE
is as follows:
1) Equation uses the ideal gas law to convert the PPMv to moles per million
moles and standard molar volume of 359 cubic feet air per lb mole of air
2) Equation is then:
Section 5-4
Lbs DCNmin = lb moles DCA x 99 lbs/lb mole DCA x 25 cfm x 1440
min/day/359 cf/mole air
= (650 X10-6) X 99 X 25 X 1440/359
= 6.5 lbs DCNday
Conclusions
8. Please revise Section 5-4 to describe the limitations of the pilot test
results due to the maximum flow capacity being attained during the initial
step.
NCDENR Response 8. See Response to EPA Comments 17 through 24.
9. Please revise Section 5-4 to describe the limitations of the radius of
influence evaluation due to the lack of data, extrapolation based on only
two data points, and the lack of response from vapor monitoring point
VM-2.
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NCDENR Response 9. See Response to EPA Comments 17 through 24.
10. Please revise Section 5-4 to describe the limitations of the evaluation of
screen lengths, extraction flow rates and short circuiting due to the fact
that the maximum flow rate of the blower unit was reached in the first
step and that vapor monitoring point VM-2 appears to have difficulty
communicating with extraction well VEW-1.
NCDENR Response 10. See Response to EPA Comments 17 through 24.
11. Please revise Section 5-4 to describe the lack of response from vapor
monitoring point VM-2 and the impact on the evaluation of vacuum
influence.
NCDENR Response 11. See Response to EPA Comments 17 through 24.
12. Please revise Section 5-4 to include a discussion of the soil
heterogeneity and its impact on influent vapor concentrations.
Response to NCDENR 12. See Response to EPA Comments 17 through 24.
Section 6-1 Wastewater Collection System Improvements
13. The last paragraph of Section 6-1 indicates that complete documentation
on the results of the inspections and corrective actions, including photos
and specifics on the products used, will be presented in the Remedial
Action Report to be submitted for agency review upon completion of
construction activities. If the inspection and corrective action activities
cannot be described in detail during this "design" phase, the preference
would be for the agencies to be involved in the inspection and corrective
action processes as they are occurring rather than to simply be informed
upon the conclusion of construction activities. Please revise Section 6-1
accordingly.
Response to NCDENR 13. Efforts will be made to coordinate field
inspections with agency personnel and include personnel in decision-
making process on repairs/upgrades.
Section 6-2 Physical Upgrades -Containment Structures and Floors
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14. The last paragraph of Section 6-2 indicates that complete documentation
on the results of the inspections and corrective actions, including photos
and specifics on the products used, will be presented in the Remedial
Action Report to be submitted for agency review upon completion of
construction activities. If the inspection and corrective action activities
cannot be described in detail during this "design" phase, the preference
_would be for the agencies to be involved in the inspection and corrective
action processes as they are occurring rather than to simply be informed
upon the conclusion of construction activities. Please revise Section 6-2
accordingly.
Response to NCDENR 14. Efforts will be made to coordinate field
inspections with agency personnel and include personnel in decision-
making process on repairs/upgrades.
Section 6-3 Installation of Transfer Piping
15. The last paragraph of Section 6-3 indicates that complete
documentation, including photos and specifics on the products used, will
be presented in the Remedial Action Report to be submitted for agency
review upon completion of construction activities. If the installation of
transfer piping cannot be described in detail during this "design" phase,
the preference would be for the agencies to be involved in the installation
of transfer piping as it is occurring rather than to simply be informed
upon the conclusion of construction activities. Please revise Section 6-3
accordingly.
Response to NCDENR 15. Transfer piping design and installation is being
handled by plant staff as a "standard" upgrade to the systems. We will
be able to provide this information to the agencies but only post-
construction.
Section 6-4 Road/Pad Replacement and Soil Removal
16. Please revise Section 6-4 to include greater detail regarding the surface
water collection trench inspection and corrective measures. If the
surface water collection trench inspection and corrective measures
cannot be described in detail during this "design" phase, the preference
would be for the agencies to be involved in the surface water collection
trench inspection and corrective measures as they are occurring rather
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than to simply be informed upon the conclusion of construction activities.
Please revise Section 6-4 accordingly.
Response to NCDENR 16. Design Plans included
17. Please revise the first sentence of the fourth paragraph of Section 6-4 to
describe the thickness of the proposed high-density polyethylene
sheeting.
Response to NCDENR 17. Two layers of 6 mil HOPE sheeting will be used.
18. Please revise Section 6-4 to include provisions for characterizing the soil
left in place prior to backfilling.
Response to NCDENR 18. There are no plans for characterization sampling
of residual soils other than PIO readings. Road soils have been
sampled/characterized completely in previous efforts. The soils are
being removed to allow for installation of the air conveyance pipes and to
build a proper sub base for the new road.
19. Please revise Section 6-4 to include greater detail regarding the
placement of backfill and the construction of the replacement pad/road.
Response to NCDENR 19. Design Plans included
20. Please revise the last paragraph of Section 6-4 to include the frequency
and methodology for the conformance testing and analysis of the
replacement pad/road.
Response to NCDENR 20. See included design plans for testing
requirements.
Section 6-5 SVE System Installation
21. Please revise Section 6-5 to include much greater detail (i.e.,
engineering diagrams, material specifications and performance data, cut
sheets, etc.) regarding the soil vapor extraction (SVE) system details.
Response to NCDENR 21. Information to be included in forthcoming
submittal
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ARCADIS Mr. Jon Bornholm
April 14, 2009
Section 6-6 Air Injection System Installation
22. Please revise Section 6-6 to include much greater detail (i.e.,
engineering diagrams, material specifications and performance data, cut
sheets, etc.) regarding the air injection system details.
Response to NCDENR 22. Information to be included in forthcoming
submittal.
Section 6-8 Off-Gas Treatment
23. As soon as reasonably possible, please submit, in great detail (i.e.,
engineering diagrams, engineering calculations, material specifications
and performance data, cut sheets, etc.), the pertinent information
regarding the off-gas treatment.
Response to NCDENR 23. Information to be included in forthcoming
submittal
Section 7.0 Post-Construction Activities
24. Please revise Section 7.0 to include provisions for the performance
verification testing of the SVE system, the air injection system and the
off-gas treatment.
Response to NCDENR 24. SVE system will function until influent gas
monitoring indicates asymptotic conditions have been reached for a
period of not less than six months. After a two-month shutdown period,
a series of Summa canisters will be collected from select SVE wells.
The results of TO-15 analyses will be compared to the asymptotic level
reached prior to shut down. The plan for monitoring and confirmation
sampling is more fully discussed above at the end of the EPA comments.
Table 2 March 2008 Pilot Vapor Analytical Data Summary
25. Please correct the spelling of the word "Analytical" in the title of Table 2.
NCDENR Response 25. Agreed
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26. Please correct the heading of the last column of Table 2 to indicate
"lbs/day".
Response to NCDENR 26. Agreed
Figure 3 2008 Soil Vapor Extraction Pilot Study Location
27. Please revise Figure 3 to simply provide the 2008 soil vapor extraction
pilot study test locations and remove all references to the previous
remedial design submittal.
NCDENR Response 27. Agreed
Should you have any further comments regarding this project, please contact me at
864.987.3906 or 864.982.9890.
Sincerely,
ARCADIS
Elizabeth Rhine
Project Coordinator
Copies:
A~gela Dahl
Debra Rubenstein
Jerry McMurray
David Mattison
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April 14, 2009
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PAVEMENT AND SECONDARY CONTAINMENT
TABLE OF CONTENTS:
S000 TITLE PAGE
SOOI -GENERAL NOTES AND STRUCTURAL ABBREVIATIONS
S100 -EXISTING CONDITION AND SUB-GRADE UTILITY PLAN
S101 -DEMOLITION AND SITE PREPARATION PLAN
S102 NEW PAVEMENT PLAN
SI 03 -PAVEMENT AND PAVEMENT APPURTENANCES PLAN
SI 04 -VACUUM PIPING DLAGR.AM
S200 -PAVEMENT STANDARD DETAILS
POSSIBLE BORROW
SITE 1
POSSIBLE BORROW
SITE 2
DESIGN
PREPARED FOR:
SITE LOCATION:
AKZONOBEL
AKZONOBEL
485 CEDAR SPRINGS ROAD
SALISBURY, NORTH CAROLINA 28147
CONSTRUCTION
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CONTAINMENT DE616N
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TITLE PAGE
ISSUE DATE,02-ll-20(2B
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