MO-4770_15855_CA_MRP_20231117

ESP Associates, Inc.
P.O. Box 7030 • Charlotte, NC 28241
1.800.960.7317 • NC: 704.583.4949, fax [phone] • SC: 803.802.2440, fax [phone]
www.espassociates.com
November 17, 2023
Mr. Scott Ryals
North Carolina Department of Environmental Quality
Division of Waste Management
1646 Mail Service Center
Raleigh, North Carolina 27699-1646
Email: [e-mail]
Reference:LETTER REPORT - AGGRESSIVE FLUID VAPOR RECOVERY
R.S. Braswell (Incident #15855)
531 South Cannon Boulevard
Kannapolis, Cabarrus County, North Carolina
ESP Project No. 23-00200-065
Dear Mr. Ryals:
ESP Associates, Inc. (ESP) is pleased to submit this letter report documenting the results of the
Aggressive Fluid Vapor Recovery (AFVR) event on monitoring well MW-1R at the subject site,
R.S. Braswell, in accordance with North Carolina Department of Environmental Quality (NCDEQ)
Task Authorization No. 2 approved on October 18, 2023. The subject site is located at 531 South
Cannon Boulevard in Kannapolis, North Carolina (location depicted on Figures 1 and 2).
On October 25, 2023, a representative of ESP mobilized to the site to document a planned 8-hour
AFVR event conducted on monitoring well MW-1R (location depicted on Figure 2; well
construction and depth to water data presented in Table 1) by EVO Corporation (EVO). The
AFVR event was concluded prematurely after five hours due to a limited recovery of petroleum-
impacted groundwater from MW-1R. Prior to the AFVR event, the water level in MW-1R,
measured using a decontaminated water level meter, was 30.52 feet (ft) below top of casing
(bTOC). No measurable free product was encountered in MW-1R prior to the event. Based on the
water level measurement, EVO lowered a 1-inch diameter polyvinyl chloride (PVC) “stinger” pipe
to a depth of 32 ft bTOC. The stinger was then connected to a 2-inch diameter vacuum hose, which
ran from the stinger to the vacuum truck used for the AFVR event. Measurements of vacuum
pressure, exhaust gas velocity, exhaust gas temperature, exhaust gas relative humidity, and volatile
organic compound (VOC) vapor concentration in the exhaust gas were taken at the start of the
AFVR event and every half hour thereafter until the event was concluded (see field notes and site
photographs in Attachment A). VOC vapor concentrations were measured using a
photoionization detector (PID) which was calibrated prior to the AFVR event using isobutylene as
the calibration gas (see Attachment A).
Letter Report - Aggressive Fluid Vapor Recovery ESP Project No. 23-00200-065
R.S. Braswell (Incident #15855)November 17, 2023
2
According to the waste manifest and certificate of disposal provided by EVO (see Attachment B),
a total of 5 gallons of petroleum-impacted groundwater were recovered from MW-1R and disposed
of at a permitted off-site waste disposal facility. Additionally, according to calculations performed
by ESP personnel, a total of 1.42 pounds or 0.23 gallons of VOC vapors were removed from
MW-1R during the AFVR event (see Attachment C).
ESP plans to mobilize to the site approximately one month following this AFVR event to collect
groundwater samples from MW-1R and other site monitoring wells to assess the effectiveness of
the AFVR event in reducing contaminant concentrations at the subject site.
We appreciate the opportunity to provide environmental services on this project. If you should have
any questions, please do not hesitate to contact us at [phone].
Sincerely,
ESP Associates, Inc.
Matthew R. Craig Nora A. Zirps, PE, RSM
Project Manager Senior Project Engineer
Figure 1 - USGS Topographic Site Location Map
Figure 2 - Site Map
Table 1 - AFVR Recovery Well Construction and Depth to Groundwater Data
Attachment A - Field Documentation and Photographs
Attachment B - Waste Disposal Manifest
Attachment C - VOC Emissions Calculation
1
FIGURES
www.espassociates.com
ESP Associates, Inc.
P.O. Box 7030
Charlotte, NC 28241
Phone [phone]
LEGEND:
FIGURE 1
USGS TOPOGRAPHIC SITE LOCATION MAP
R.S. BRASWELL
KANNAPOLIS, NORTH CAROLINA
SHEET TITLE
PROJECT
CHECKED BY
DRAWN BY
SCALE
PROJECT NO.All locations are approximate.
DATE
23-002000-065
As Shown
WR
CW10/24/2023
µ
USGS The National Map: National Boundaries Dataset, 3DEP Elevation Program, Geographic Names Information System, National Hydrography Dataset,
National Land Cover Database, National Structures Dataset, and National Transportation Dataset; USGS Global Ecosystems; U.S. Census Bureau TIGER/Line data;
USFS Road Data; Natural Earth Data; U.S. Department of State Humanitarian Information Unit; and NOAA National Centers for Environmental Information, U.S.
Coastal Relief Model. Data refreshed April, 2023.
Site Boundary 0 500250Feet
NCDEQ Incident No. 15855
R.S. Braswell
531 South Cannon Boulevard
Kannapolis, North Carolina
www.espassociates.com
ESP Associates, Inc.
P.O. Box 7030
Charlotte, NC 28241
Phone [phone]
LEGEND:
FIGURE 2
SITE MAP
R.S. BRASWELL
KANNAPOLIS, NORTH CAROLINA
SHEET TITLE
PROJECT
CHECKED BY
DRAWN BY
SCALE
PROJECT NO.All locations are approximate.
DATE
23-002000-065
As Shown
WR
CW10/24/2023
@A Monitoring Well
@A Abandoned Monitoring Well
Former UST Basins
Site Boundary µ0 10050Feet
@A
@A
@A
@A
@A
@A
@A
@A
@A @A2929S Cannon BlvdSCannonBlvd29
29
29
29
SCannonBlvdS Cannon BlvdEsri Community Maps Contributors, Cabarrus County Government, mecknc, State of North Carolina DOT, © OpenStreetMap, Microsoft, Esri, HERE, Garmin,
SafeGraph, GeoTechnologies, Inc, METI/NASA, USGS, EPA, NPS, US Census Bureau, USDA, NC CGIA, Maxar, Microsoft
MW-8
MW-7
MW-9
MW-6
MW-1R
MW-5
MW-2MW-1
MW-3MW-4
NCDEQ Incident No. 15855
R.S. Braswell
531 South Cannon Boulevard
Kannapolis, North Carolina
2
TABLES
Table 1
AFVR Recovery Well Construction and Depth to Groundwater Data
R.S. Braswell
Kannapolis, North Carolina
NCDEQ Incident No. 15855
Well ID Date
Installed
Screened Interval
(ft BGS)
Bottom of
Well
(ft BGS) a
Date Water
Level Measured
Depth to Water
from Top of
Casing
(ft bTOC)
Free Product
Thickness
(ft)
MW-1R 9/26/2016 unknown 40.0
7/23/2020 27.60 --
1/19/2021 27.97 --
7/6/2021 27.52 --
10/25/2023 30.52 --
Notes:
a Bottom of well measurement along with pre-2023 water level depths are from previous consultant's monitoring report.
-- no measurable free product
BGS - below ground surface
bTOC - below top of casing
ft - feet
3
ATTACHMENT A
View of EVO vacuum
truck used in AFVR
event.
View of stinger pipe in
monitoring well MW-1R.
View of stinger pipe
connected to vacuum
truck.
View of monitoring well
MW-1R, closed after
AFVR.
4
ATTACHMENT B
5
ATTACHMENT C
Page 1 of 3
AGGRESSIVE FLUID VAPOR RECOVERY EVENT
SITE NAME: R.S. BRASWELL CONSULTANT: ESP ASSOCIATES, INC.
INCIDENT NUMBER:15855
AVERAGE DEPTH TO GROUNDWATER: 30.52 ft
DESCRIBE SOIL IN THE SATURATED ZONE:unknown
AVERAGE HYDRAULIC CONDUCTIVITY (if known): unknown
EXTRACTION WELLS USED FOR AFVR: MW-1R
SPECIFICATIONS OF THE AFVR SYSTEM (cfm @ in Hg): unknown
DRY STANDARD CUBIC FEET PER MINUTE (DSCFM) AIR FLOW CALCULATIONS (Qstd)
Date Hours Vacuum Velocity Pipe ID Temp Rel Humid Water Water Qstd
(inches of Hg)(ft/min)(in)(°F)(%)Vapor (Wt%)Vapor (Vol%)(DSCFM)
10/25/2023 -20 303 6 36 50 0.0022 0.004 63
10/25/2023 0.5 20 47 6 52 60 0.0049 0.008 9
10/25/2023 1.0 25 184 6 83 70 0.0167 0.026 34
10/25/2023 1.5 26 77 6 119 100 0.0771 0.110 12
10/25/2023 2.0 25 72 6 144 100 0.1711 0.215 10
10/25/2023 2.5 25 59 6 140 100 0.1524 0.196 8
10/25/2023 3.0 25 42 6 164 100 0.3351 0.349 5
10/25/2023 3.5 25 128 6 145 100 0.1814 0.225 17
10/25/2023 4.0 25 235 6 176 100 0.5469 0.467 20
10/25/2023 4.5 28 68 6 148 100 0.1924 0.236 9
10/25/2023 5.0 30 372 6 157 100 0.2600 0.294 44
NOTES
Qstd = Flow in dry cubic feet per minute (DSCFM)
Vacuum = The level of vacuum being applied should be recorded from the AFVR system (inches of Hg)
Velocity = The rate at which air flows is measured at the blower discharge piping (anemometer or pitot tube)
Pipe ID = The inside diameter of the blower discharge piping (from the AFVR system)
Temperature = The temperature of the air stream exiting the blower discharge piping (dry bulb temp., in °F)
Relative humidity = The % relative humidity of the air stream exiting the blower discharge piping
Bwsw = water vapor % by weight (i.e., pounds of water per pound of dry air, derived from the Psychrometric chart [temp vs relative humidity])
Bws = water vapor % by volume
EQUATIONS
Bws = (Bwsw/18 lb-mole H20)/[(1/28.84 lb-mole dry air) + (Bwsw/18 lb-mole H2O)]
Qstd = (1-Water Vapor) * velocity * (PI * (diameter/24)2) * (528°R/(Temp + 460))
Page 2 of 3
EMISSION CALCULATIONS
Elapsed
Time Flow PPMmeasured PPMwet PPMdry K PPMconc Cc:m Cc PMRc PMRg PMR
(hour)(DSCFM)(ppm)(#C - gas)(mg/dsm3)(lb/dscf)(lb/hour)(lb/hour)(lb)
-63 33 33 33 4 132 66 4.1263E-06 0.02 0.02 0.00
0.5 9 21 21 21 4 85 42 2.6372E-06 0.00 0.00 0.00
1.0 34 2420 2420 2485 4 9939 4959 0.0003096 0.64 0.74 0.37
1.5 12 396 396 445 4 1780 888 5.5437E-05 0.04 0.05 0.02
2.0 10 399 399 508 4 2034 1015 6.3345E-05 0.04 0.04 0.09
2.5 8 396 396 493 4 1971 983 0.00006139 0.03 0.03 0.02
3.0 5 546 546 839 4 3357 1675 0.00010456 0.03 0.03 0.02
3.5 17 404 404 521 4 2086 1041 6.4969E-05 0.07 0.08 0.04
4.0 20 658 658 1235 4 4938 2464 0.00015383 0.19 0.22 0.87
4.5 9 0 0 4 0 0 0 0.00 0.00 0.00
5.0 44 0 0 4 0 0 0 0.00 0.00 0.00
Total VOC emissions in pounds 1.42
Total VOC emissions as gallons (pounds / 6.152)0.23
NOTES
PPMmeasured = Actual measurements (ppm) taken with a PID at the blower discharge piping
PPMwet = "wet" concentration
PPMdry = "dry" concentration
K = Number of carbons in calibration gas: (Methane K = 1, or Propane K = 3, or Isobutylene K = 4, or Hexane K = 6)
PPMc= PPMv, Volumetric concentration of VOC emissions as carbon, dry basis at STP
Cc:m = mg/dsm3, mass concentration of VOC emissions as carbon
Mc = 12.01 mg/mg-mole, molecular weight of carbon
K3 = 24.07 dsm3/106 mg-mole, mass to volume conversion factor at STP
Cc = lb/dcsf, mass concentration of VOC emissions as carbon, dry basis at STP
PMRc = lb/hr, pollutant mass removal rate of VOCs as carbon
PMRg = lb/hr, pollutant mass removal rate of of VOCs as gasoline
PMR = lb, pollutant mass removal of VOCs as gasoline
EQUATIONS
PPMwet = PPMmeasured
PPMdry = (PPMwet)/(1-Bws)
PPMc = (PPMd)(K)
Cc:m = (PPMc)(Mc / K3)
Cc = (Cc:m)(62.43x10-9 lb-m3/mg-ft3)
PMRc = (Cc)(Qstd)(60 minute/hour)
PMRg = (PMRc)(Mg/Mcg)
PMR = (PMRg)(#hours)