HomeMy WebLinkAboutMO-30159_49214_CA_SCH_20230414_Site Check
100 East Ruffin Street ꞏMebane, North Carolina 27302
Telephone (919) 563-9091 ꞏFacsimile (919) 563-9095
www.terraquestpc.com
April 14, 2023
Allyson Sonntag
First Citizens Bank & Trust Company
4300 Six Forks Rd.
Raleigh, NC 27609
Re: Summary of Phase II Soil Sampling Assessment Letter
BCA Property Mgmt., LLC
280 Ervin Woods Dr.
Kannapolis, Rowan County, NC
First Citizens RIMS File#: 23-000364-02-1
Terraquest Project No. 03323
Dear Mrs. Sonntag:
Terraquest Environmental Consultants, P.C. (Terraquest) completed soil sampling activities at the
BCA Property Mgmt., LLC property located at 280 Ervin Woods Dr. in Kannapolis in Rowan County,
NC (herein referred to as the subject property). The purpose of this letter is to summarize the
findings of the limited soil assessment performed at the subject property by Terraquest and
explains the ramifications of what was discovered. The location of the subject property is
depicted in the attached Figure 1.
Site Summary
The subject property totals 4 acres in size and contains a landscaping business office building,
maintenance garage building, and maintenance yard built in 1988. The subject property is
located outside the city limits of Kannapolis, NC. Historically the subject property has been
woods and a residence. Surrounding properties have historically been cultivated farmland and
woods with a gradual development of residences and light industrial buildings to the east and
west and a sand rock pit to the south. A water supply well is connected to the subject property’s
buildings. Each of the buildings has their own septic system that are located on the adjacent
properties to the east and west.
Initial Site Survey
The following items were identified on the subject property during the completion of the Phase
I ESA Report dated December 1, 2022 by Mid-Atlantic Associates, Inc. of Raleigh, NC:
1) The four petroleum aboveground storage tanks present a material threat of a future
release.
BCA Property Mgmt., LLC
280 Ervin Woods Dr., Kannapolis, Rowan County, NC
Page 2
April 14, 2023
2) The presence of a vehicle repair pit with observed floor staining and a floor drain that
likely drains to the subsurface septic field.
3) A potential heating oil UST associated with a former residence located in the western
portion of the property.
On March 30, 2023, Terraquest completed a site visit and identified the following items:
1) An approximate 280-gallon heating oil UST is located off the west side of the maintenance
garage building. The UST supplies the furnace located in the garage building but is
currently not in use.
2) A 1,000-gallon or greater waste oil UST is located off the south side of the office building.
The waste oil UST is connected to the oil changing pit floor drain and drain funnel through
underground pipes. The lawn mowing maintenance crew periodically places waste oil
generated from lawn maintenance equipment in the UST. Historically, it was used during
the servicing of the trucks of the former trucking business located on the subject property.
3) The septic system for the office building is located on the adjacent property to the east
owned by JAM Logistics LLC.
4) The septic system for the maintenance garage building is located on the adjacent property
to the west owned by Eric Wilson et al.
5) Two concrete holding tanks greater than 5,000-gallons each are located south of the wash
pad in the southwest corner of the property. The tanks are holding tanks that are
periodically pumped out when full. The tanks are currently not being used and were
mostly empty during the site visit.
Terraquest confirmed the locations, approximate sizes, and current/former uses of the above
items with the former property owner David Ervin. The locations of the above items are depicted
in the attached Figure 2.
Phase II ESA
The focus of the Phase II ESA performed by Terraquest was to determine the potential presence
of USTs in the vicinity of the former residence and the soil quality in the vicinity of the 280-gallon
heating oil UST and the 1,000-gallon or greater waste oil UST. Given the inactive status and non-
hazardous use of the wash pad, the concrete holding tanks were not investigated during the
Phase II ESA.
Geophysical Investigation
On March 30, 2023, Terraquest contracted the completion of geophysical investigation of the
subject property. The survey was conducted by East Coast Geophysics, Inc. of Apex, NC. The
geophysical investigation, consisting of metal detection and GPR surveys, was completed to
determine the presence of the current and potential UST basins and product lines and private
buried utilities on the subject property.
BCA Property Mgmt., LLC
280 Ervin Woods Dr., Kannapolis, Rowan County, NC
Page 3
April 14, 2023
The following conclusions can be made from the GPR study:
1) The heating oil UST off the west side of the garage building is approximately 280-gallons
in capacity.
2) The waste oil UST off the south side of the office building is approximately 1,000 or more
gallons. The dimensions were difficult to determine given its proximity to the metal siding
of the office building.
3) No USTs were noted on the property in the vicinity of the former residence.
During the Phase II ESA site visit on March 30, 2023, Terraquest personnel advanced soil borings
in the vicinity of the heating oil and waste oil USTs.
Soil Sampling
To determine soil quality at the subject property, Terraquest advanced the following soil borings:
SB1 and SB2 – at the 280-gallon heating oil UST along the west side of the garage
building
SB3, SB4, and SB5 – at the 1,000-gallon or greater waste oil UST south of the office
building
The soil borings were advanced using direct push technology and a Macro-Core tube retrieval
sampling system. Direct push technology consists of advancing a sampling device into the
subsurface soils by applying static pressure, by applying impacts, by applying vibration, or any
combination thereof, to the above ground portion of the sampler extensions until the sampler
has advanced to the desired depth (ASTM D6282). A single tube Macro-Core sample system was
utilized to collect soil samples in five-foot intervals. A single tube sample system used a hollow
extension/drive rod to advance and retrieve the sampler. Within the hollow extension, a new,
single-use, poly-vinyl chloride (PVC) liner retained the soil sample as the tube is driven into the
ground. The specific direct push equipment utilized was a Geoprobe 7822DT. The Macro-Core
tube was decontaminated between each 5-foot sample interval in a soil boring using a Liquinox
and tap-water mixture. A new PVC liner was used to collect soil from each 5-foot sample interval
in a soil boring. Technical Methods and Standard Procedures utilized by Terraquest are attached.
The SB1 and SB2 soil borings were advanced to a depth of 15 feet below ground level (BGL). The
SB3 and SB5 soil borings were advanced to a depth of 10 feet BGL where refusal was
encountered. The SB4 soil boring encountered refusal a depth of 4 feet BGL. In each soil boring,
soils from the sample intervals (3-5, 5-7, 8-10, and 13-15 feet BGL) were placed in sealable plastic
bags and screened for volatile organic compounds (VOCs) and semi-volatile organic compounds
(SVOCs) utilizing a Photoionization Detector (PID). The soil lithology encountered during the soil
borings was a yellowish-orange, med. stiff Lean Clay (CL) from 0.5 feet to 10 feet BGL and a
yellowish-orange hard Lean Clay (CL) from 10 feet BGL to 15 feet BGL.
BCA Property Mgmt., LLC
280 Ervin Woods Dr., Kannapolis, Rowan County, NC
Page 4
April 14, 2023
The soils to be submitted for analysis were determined by the depth of the UST system
component sampled and the PID screening measurements. The soil sample from SB1 was
submitted from a depth of 13 to 15 feet BGL. Soil samples from SB2 were submitted from a depth
of 10 to 12 feet BGL and 13 to 15 feet BGL. Soil samples from SB3 and SB5 were submitted from
a depth of 8 to 10 feet BGL. No soil sample was submitted from the SB4 soil boring.
The soil samples collected for analysis were placed in the proper laboratory-prepared sampling
containers, labeled with the project name, project number, sample identification, required
analysis, and date and time of collection. The samples were immediately placed on ice and
analyzed before the expiration of an analytical method’s prescribed holding time. The soil
samples were analyzed for total petroleum hydrocarbons (TPH) for low boiling point petroleum
hydrocarbons (GRO) and medium to high boiling point petroleum hydrocarbons (DRO) by UVF
Trilogy technology. Chain-of-custody documentation was maintained for the soil samples.
Soil Sample Analytical Results
The North Carolina Department of Environmental Quality Division of Waste Management – UST
Section (NCDEQ DWM-UST) Action Limits of 100 milligrams per kilogram (mg/kg) for TPH DRO
and 50 mg/kg for TPH GRO were exceeded in the following soil samples:
SB1 @ 13-13.5’ BGL
SB2 @ 10-12’ BGL
SB2 @ 13-15’ BGL
SB3 @ 8-10’ BGL
No concentrations above the NCDEQ DWM-UST Action Limits were detected in the SB5 soil
sample. The attached Table 1 summarizes the sample depth and detected concentrations of the
SB1, SB2, SB3, and SB5 soil samples. The locations of the SB1, SB2, SB3, SB4, and SB5 soil samples
are depicted in the attached Figure 2. The complete analytical report is attached.
Findings
The soil sample analytical results reveal levels of soil contamination above the NCDEQ DWM-UST
Action Limits for TPH GRO and DRO in the SB1, SB2, and SB3 soil samples at the 280-gallon heating
oil UST and 1,000-gallon plus waste oil UST.
BCA Property Mgmt., LLC
280 Ervin Woods Dr., Kannapolis, Rowan County, NC
Page 5
April 14, 2023
Recommendations
Terraquest recommends the following scope of work to address the findings of the Phase II ESA:
1) Reporting the release incidents to the NCDEQ DWM-UST.
2) Either closing the USTs by removal or in place closure or conducting tank tightness tests
on each UST to determine their integrity for future use.
3) Removing the impacted soil surrounding the USTs during their removal and/or completing
the regulatory requirements for heating oil and waste oil UST releases to obtain closure
of the release incidents.
We appreciate the opportunity to provide environmental services. If you have any questions
regarding this letter, please call me at (919) 563-9091 or (919) 906-0707.
Sincerely,
TERRAQUEST ENVIRONMENTAL CONSULTANTS, P.C.
Jonathan R. Grubbs, P.G.
Vice President
Attachments
Table 1: Summary of Soil Sampling Results
Figure 1: Site Location Map
Figure 2: Phase II ESA Sample Location Map
Technical Methods and Standard Procedures
Analytical Report
Table 1
4/5/2023
UV
F
T
R
I
L
O
G
Y
UV
F
T
R
I
L
O
G
Y
Date Collected Sample Depth (feet BGL)
SB1 3/30/23 13 -15 2,720 1,610
SB2 3/30/23 10 - 12 1,830 2,795
SB2 3/30/23 13 - 15 1,670 2,795
SB3 3/30/23 8 - 10 320 370
SB5 3/30/23 8 - 10 8.38 <1
100 50
Notes:
1. All results in mg/kg.
2. Bold denotes a compound detection.
3. Grey Shading denotes a TPH Action Limit violation.
4. "<" = less than sample detection limit
5. Sample depths are in feet below ground level.
SUMMARY OF SOIL SAMPLING RESULTS
Site Name: 280 Ervin Woods Dr., Kannapolis, Rowan County, NC
TP
H
G
R
O
TPH Action Limit
Analytical Method
Sample ID
Contaminant of Concern
TP
H
D
R
O
ONSULTANTS, P.C.CENVIRONMENTAL
TECHNICAL METHODS/STANDARD PROCEDURES
Equipment Decontamination
All soil sampling equipment utilized during site assessment activities is decontaminated according
to standard and accepted protocol. Cleaning solutions range from clean potable water to acidic
solutions or organic solvents depending on the contaminants present at the site. Equipment
utilized at sites, such as hand augers, contaminated with petroleum hydrocarbons, is generally
decontaminated with a low-sudsing detergent such as Luiquinox® and triple rinsed with distilled
water. Larger equipment, such as drill rigs and associated tools, is steam cleaned. All
decontamination procedures are completed within an established decontamination area which is
located away from the active study area. Frequency of equipment decontamination depends on
the nature of work being performed, but in no case is decontamination performed less frequently
than once per test (i.e., soil boring, well installation, sample collection, etc.). Equipment blanks are
collected as a quality control measure when required by job specifications.
Soil Boring Installation
Soil borings are completed using hand-operated sampling tools, truck-mounted drills, or
Geoprobe® drilling rigs depending on the depth of sample collection and other site-specific
conditions. Hand operated stainless-steel bucket augers are utilized to collect soil samples at
regular intervals to determine site stratigraphy and to test for the presence of volatile organic
compounds. Samples retrieved from the hand auger are necessarily disturbed during the augering
process, but can provide accurate information on soil type and contaminant concentrations when
properly interpreted. Soil samples from hand augered borings are generally retrieved at one to
two foot intervals.
Truck-mounted or Geoprobe® drilling equipment is often utilized when sample retrieval depths
exceed twenty feet or subsurface conditions prevent utilization of hand augers (i.e., buried rocks,
wood, bricks or other materials occur in the subsurface). Truck-mounted drilling rigs usually
retrieve soil via a hollow-stem auger/split spoon collection method. Geoprobe® rigs usually employ
a Macro-Core® tube retrieval system.
Hollow stem augers provide relatively undisturbed 2-foot cores of soil samples. Soil samples are
generally collected at five foot intervals utilizing standard penetration test procedures as defined
by the American Society for Testing and Materials (ASTM) or are pushed to the desired depth using
the head of the drill rig. The standard penetration test involves driving a 2" outside diameter by 1-
3/8" inside diameter split-spoon sampler a minimum distance of one foot with a 340-lb. slide
hammer falling a distance of 30 inches.
A Geoprobe® rig is a hydraulically-powered soil probing machine. The probe utilizes static force
and percussion to advance a small diameter sampling device into the subsurface. The sampling
apparatus provides relatively undisturbed 5-foot cores of soil samples. Soil samples are collected
continuously. The Macro-Core® tube contains an inserted poly-vinyl chloride (PVC) liner which
retains the soil sample as the tube is driven into the ground. The Macro-Core® tube is
decontaminated between each 5-foot sample interval in a soil boring using a Liquinox and tap-
water mixture. A new PVC liner is used to collect soil from each sample interval in a soil boring.
Soil samples retrieved from the hollow-stem augers or Geoprobe are then carefully described
according to the Unified Soil Classification System. Soil descriptions are recorded on a soil
boring log.
Soil Sampling
Soils to be analyzed by a North Carolina-certified laboratory are prepared according to the specified
analytical method. Initially, soil samples are removed from the ground using either a hand auger,
backhoe bucket, spilt spoon auger, or a Macro-Core® sampling tube. During the removal, care is
taken to keep the disturbance of the soil structure to a minimum to reduce the loss of
contaminants. Once removed, the samples are placed in the proper sample container for the
specified analytical method. For samples collected for the MADEP VPH and EPA Method 8260, a
TerraCore® sampler is used to collect one 5-gram allotment of soil. The allotment is placed in
methanol-preserved 40 mL vials. Also, one 5-gram allotment of soil is placed into sodium bisulfate-
preserved 40 mL vials (one 5-gram allotment per vial, 2 vials per sample) for the 8260 low
concentration method. A 250-mL glass jar of the sampled soil is also collected to provide moisture
content information. Soils sampled for MADEP EPH, EPA Method 8270 and TPH 5030 and 3550 are
placed in a 250-mL glass jar (for MADEP EPH analysis an amber jar is required). TPH 5030 samples
are preserved in methanol similar to the 8260 analysis. Field personnel wear new, disposable
nitrile gloves during the collection of each sample.
The soil samples are labeled with the sample location, sample identification, date and time of
collection, and the analytical method. The samples are placed on ice, sent to a laboratory, and
analyzed before the expiration of an analytical method’s prescribed holding time. Chain-of-custody
documentation is maintained for each sample collected in the field.
If the soil is being sampled for volatile or semi-volatile compounds, a portion of the collected soil is
placed in a sealable bag and screened for volatile organic vapors. Head screening procedures are
described in the following paragraph.
Headspace Screening
Collected soil samples are routinely tested for the presence of volatile organic compounds (VOCs).
After retrieval from the ground, a portion of a soil sample is placed in a sealable plastic bag. The
soil samples are then set aside for approximately five minutes so that volatile constituents present
in the sample can reach equilibrium concentrations with headspace gases in the bag. Once a
suitable time period has passed, the probe of the sampling instrument, typically an Organic Vapor
Monitor (OVM) or a Photo Ionization Detector (PID), is inserted into the bag and the relative
concentration of total VOCs is measured and permanently recorded in a field note book. VOC
concentrations are measured using either a Thermo Electron Corp. Innova Series catalytic OVM or
an Ion Science PhoCheck PID. Both the OVM and PID instrumentation are periodically calibrated
according to the manufacturer’s recommended procedures.
The OVM and PID are qualitative tools employed to detect and estimate the concentration of
organic or hydrocarbon vapors. A thin probe is inserted through a small break in the seal of a
bagged soil sample. For the OVM, an air sample from the headspace of the bag is drawn through
the probe into an internal chamber where the vapors are catalyzed. The concentration of the VOCs
is registered on a digital scale in parts per million (ppm). For the PID, an air sample from the
headspace of the bag is drawn across the face of a lamp causing the sample to emit photons, the
presence of which are converted into a VOC ppm reading that is displayed. Oxygen levels are field
calibrated prior to each use. VOC calibration occurs periodically depending upon use by using a
span gas of known concentration in a process recommended by the manufacturer.
Well Installation/Construction
Monitoring wells are installed using hand-operated sampling tools, a truck-mounted drill rig, or a
Geoprobe drilling rig depending on the depth of well and other site-specific conditions. All
monitoring wells are installed according to the requirements of 15A NCAC 2C-Well Construction
Standards. Specifically, individual monitoring wells are constructed of 2-inch diameter, schedule 40
PVC casing riser and screen. The screen interval is generally 10 to 15 feet of machine slotted PVC
with a slot size of 0.010". Only flush threaded joints are used. The annulus space around the
screen is filled with washed filter pack No. 2 sand. The filter pack extends one to two feet above
the top of the screen. A one to two foot-thick bentonite pellet seal is then placed above the filter
pack. The remainder of the well annulus is completely filled with a Portland (Type I/II) cement
grout mixture. A protective outer steel manhole, locking cap, and concrete pad is installed for each
well.
Type II Monitoring Well Construction
Single-cased monitoring wells are generally used in delineation of groundwater quality within the
surficial aquifer. The wells are constructed of 2-inch diameter, schedule 40 PVC casing and screen.
The screen interval is generally 10 to 15 feet of machine slotted PVC with a slot size of 0.010". Only
flush threaded joints are used. The annulus space around the screen is filled with washed filter
pack No. 2 sand. The filter pack extends one to two feet above the top of the screen. A one to two
foot-thick bentonite pellet seal is then placed above the filter pack. The remainder of the well
annulus is completely filled with a Portland (Type I/II) cement grout mixture. A protective outer
steel manhole, locking cap, and concrete pad are installed for each well.
Type III Monitoring Well Construction
Double-cased monitoring wells are used in the delineation of groundwater quality within a deeper
portion of the surficial aquifer or an additional aquifer (e.g. aquitard, bedrock). A four to six-inch
outer casing is installed through the surficial aquifer until a sufficient depth or until the deeper
aquifer is encountered. The casing is secured with a Portland-grout collar that is tremmied into the
annular spaced from the bottom of the bore hole to the surface. Once the grout has sufficiently
cured, the bore hole is continued through the bottom of the outer casing to a depth approximately
15 - 20 feet beneath the outer casing. The inner casing is constructed of 2-inch diameter, schedule
40 PVC casing riser and screen. The screen interval is generally 5 to 10 feet of machine slotted PVC
with a slot size of 0.010". Only flush threaded joints are used. The annulus space around the
screen is filled with washed filter pack No. 2 sand. The filter pack extends one to two feet above
the top of the screen. A one to two foot-thick bentonite pellet seal is then placed above the filter
pack. The remainder of the well annulus is completely filled with the same Portland grout mixture
used in the outer casing. A protective outer steel manhole, locking cap, and concrete pad are
installed for each well.
Well Development
Following installation of each well, surging and pumping or bailing techniques will be used to
remove fines from the screened interval. Groundwater is removed from each well until clear water
is retrieved or a noticeable reduction in the amount of silt is achieved. Purged groundwater is
disposed of in an environmentally safe manner.
Groundwater Sampling
Petroleum Sites
Groundwater samples are collected from temporary or permanent monitoring wells according to
established sampling protocol. When multiple monitoring wells or sampling points are sampled,
sampling is completed beginning with the least contaminated well to the most contaminated well,
if it is known. When permanent monitoring wells for petroleum sites are sampled, the well is
purged of a minimum of three well-bore volumes prior to sample collection in order to assure that
sampled water is representative of aquifer conditions. In temporary wells, the first water which
migrates into the open borehole is sampled. Samples from both temporary and permanent
monitoring wells are collected using individually wrapped disposable polyethylene bailers by field
personnel wearing disposable nitrile gloves. Only one well is sampled with a given bailer in order to
prevent sample cross-contamination. During both well purging and sampling, proper protective
clothing and equipment is used and is dependent upon the type and level of contaminants present.
Also, field personnel change gloves between different samples to reduce the chance of cross-
contamination. Water samples are transferred from the bailer to laboratory-prepared sampling
containers using slow emptying devices to reduce the chance of contamination loss through
volatilization. Preservatives, such as acids, are provided by the laboratory in pre-prepared
containers in which collected samples are placed if in-field preservation is necessary. The samples
are labeled with the project name, project number, sample identification, required analysis, and
date and time of collection. The samples are placed on ice, shipped to a certified laboratory, and
analyzed before the expiration of an analytical method’s prescribed holding time. Chain-of-custody
documentation is maintained for each sample collected in the field.
Other Groundwater Sampling Protocols
When required by state or federal regulations, low-flow groundwater sampling procedures are
instituted. Groundwater samples collected in low-flow situations are collected using a peristaltic
pump. A peristaltic pump is a type of positive displacement pump. The fluid is contained within a
flexible tube fitted inside a circular pump casing. A rotor with a number of rollers attached to the
external circumference compresses the flexible tube. As the rotor turns, the part of tube under
compression closes thus forcing the fluid to be pumped to move through the tube. Groundwater
parameters such as water level drawdown, pH, conductivity, dissolved oxygen (DO) and turbidity.
Pumping rate, drawdown, and the time or volume required to obtain stabilization of parameter
readings can be used as a future guide to purge the well. Measurements are collected at a pre-
pumping established interval (typically five to ten minutes). Once all or a majority of the
parameters have stabilized for three successive readings, stabilization has been achieved. In lieu of
measuring all five parameters, a minimum subset would include pH, conductivity, and turbidity or
DO. Three successive readings should be within ± 0.1 for pH, ± 3% for conductivity, and ± 10% for
turbidity and DO.
Upon parameter stabilization, sampling is initiated. Sampling flow rate is maintained at the estab-
lished purge rate or is adjusted slightly to minimize aeration, bubble formation, turbulent filling of
sample bottles, or loss of volatiles due to extended residence time in tubing. The same device used
for purging is used to collect the groundwater sample. Generally, volatile parameters are sampled
first. The sequence in which samples for inorganic parameters are collected is not determined
unless filtered (dissolved) samples are collected. Preservatives, such as acids, are provided by the
laboratory in pre-prepared containers in which collected samples are placed if in-field preservation
is necessary. The samples are labeled with the project name, project number, sample
identification, required analysis, and date and time of collection. The samples are placed on ice,
shipped to a certified laboratory, and analyzed before the expiration of an analytical method’s
prescribed holding time. Chain-of-custody documentation is maintained for each sample collected
in the field.
During both well purging and sampling, proper protective clothing and equipment is used and is
dependent upon the type and level of contaminants present. Also, field personnel change gloves
between different monitoring wells or sampling points to reduce the chance of cross-
contamination. When multiple monitoring wells or sampling points are sampled, sampling is
completed beginning with the least contaminated well to the most contaminated well, if it is
known.
Stockpile Sampling
The number of composite samples collected from a stockpile or a total quantity of excavated soil is
based upon the cubic yardage. One composite sample is collected for every 100 cubic yards of
contaminated soil excavated. The volume of a stockpile or total quantity of excavated soil is
calculated by approximating the general geometry of a stockpile or estimating the capacity of the
dump trucks used for hauling. If a stockpile is sampled, a grid pattern is laid out on the stockpile,
dividing the stockpile into segments of approximately 200 cubic yards. Two soil borings are
advanced within a grid and three soil samples are collected from each soil boring at various depths.
The six soil samples are mixed into a composite sample by a trained TerraQuest technician. If truck
loads are sampled, an aliquot sample is collected from the hauling trucks at a frequency based
upon the capacity of the hauling trucks.
Aliquots are gently mixed into a composite sample by a trained TerraQuest technician. Every effort
is made to minimize the loss of contaminants through volatilization. The composited soil samples
are jarred in the appropriate laboratory-prepared containers, labeled with the sample location,
sample identification, date of collection, time of collection, the analytical method, and the
preservative. The samples are placed on ice, shipped to a laboratory, and analyzed before the
expiration of an analytical method’s prescribed holding time. Chain-of-custody documentation is
maintained for each sample collected in the field.
Surface Water Sampling
Surface water samples, specifically samples from creeks or streams, are collected from a
moving/flowing portion of the creek or stream to ensure that stagnant water is not collected. Field
personnel are careful to collect samples from flowing areas that are not so turbulent as to cause a
loss of volatile contaminants which might have been contained in the creek’s/stream’s water.
Samples are collected by field personnel wearing disposable nitrile gloves. Field personnel change
gloves between different locations to reduce the chance of cross-contamination. Samples are
collected directly from the appropriate creek or stream location and placed into the appropriate
laboratory-prepared containers. Preservatives, such as acids, are provided by the laboratory in pre-
prepared containers in which collected samples are placed if in-field preservation is necessary. The
samples are labeled with the project name, project number, sample identification, required
analysis, and date and time of collection. The samples are cooled on ice to approximately four
degrees centigrade, shipped to a certified laboratory, and analyzed before the expiration of an
analytical method’s prescribed holding time. Chain-of-custody documentation is maintained for
each sample collected in the field.
Potable Well Sampling
Groundwater samples from potable wells are collected from sampling points, typically spigots,
located in the closest proximity to the potable well pump house as possible. Prior to sample
collection, the water is run for a sufficient amount of time to purge the bladder tank and assure
that sampled water is representative of aquifer conditions. Once purged, the flow rate is reduced
and samples are placed in the appropriate laboratory prepared containers with the appropriate
acid preservatives added if preservation of the sample is necessary. The samples are labeled with
the project name, project number, sample identification, required analysis, and date and time of
collection. The samples are placed on ice, shipped to a laboratory, and analyzed before the
expiration of an analytical method’s prescribed holding time. Chain-of-custody documentation is
maintained for each sample collected in the field.
Public Water Supply Line Sampling
Groundwater samples from public water supply lines are collected from sampling points, typically
spigots. To sample the spigot, the flow rate is reduced and samples are placed in the appropriate
laboratory prepared containers. The samples are labeled with the sample location, sample
identification, date of collection, time of collection, and required analytical method. The samples
are placed on ice, shipped to a laboratory, and analyzed before the expiration of an analytical
method’s prescribed holding time. Chain-of-custody documentation is maintained for each sample
collected in the field.
Air Sampling
Air samples are collected with the aide of a manually operated MityVac® pump manufactured by
Pristech, Inc. The air sampling process begins by connecting a length of rubber hose from the
MityVac® pump to the port to be sampled, or by hanging the hose inside of an emissions stack in
such a manner as to ensure no outside air causes dilution. Another length of hose is fixed to the
outlet port of the pump and is connected to a new Tedlar bag. Once the pump is hooked up, a
valve on the Tedlar collection bag is opened and air is manually forced into the bag by the pumping
action of sampling personnel.
Field Measurements
Field measurements taken to determine the pH, conductivity, temperature, and dissolved oxygen
concentration of a particular groundwater sample are taken directly after a particular monitoring
well has been adequately purged. This ensures that the groundwater parameter data collected is
representative of the aquifer conditions at a given location. Once purging of the monitoring well is
complete, the decontaminated probe head and cord of the appropriate unit is lowered into the
required monitoring well. If the depth to water in a specific monitoring well is greater than the
length of cord for a particular unit, a new, disposable bailer is slowly lowered into the appropriate
monitoring well and a representative groundwater sample is retrieved. A slow pouring device is
fitted onto the end of the disposable bailer and the sample is slowly poured into a new, disposable
plastic cup. Groundwater parameter data are then collected from the groundwater in the cup
using the required unit.
For pH, conductivity, and temperature, a Hanna Instruments Model 991300 portable meter is
utilized. This unit is periodically calibrated and maintained in accordance with the unit’s operations
manual by field personnel. Prior to data collection, the unit is properly decontaminated to prevent
cross-contamination. The unit is decontaminated between each sample. The procedure used for
sample measurement involves lowering the meter’s probe into the new, disposable cup containing
the groundwater sample to be measured and slowly stirring the probe to force groundwater across
the probe’s membrane. The measurements displayed by the meter are then recorded.
For dissolved oxygen concentration measurements, a YSI® Model 55 Handheld Dissolved Oxygen
System is utilized. This unit is periodically calibrated and maintained in accordance with the unit’s
operations manual by field personnel. Prior to data collection, the unit is properly decontaminated
to prevent cross-contamination. The unit is decontaminated between each sample. The procedure
used for sample measurement involves adjusting the unit for the correct altitude where the
sampling will take place and adjusting the reported units desired. Once this is done, the unit’s
probe is inserted into the groundwater sample to be measured and the probe is slowly stirred to
force the groundwater across the probe’s membrane. The measurements displayed by the unit are
then recorded.
For turbidity measurements, a Hach 2100P Portable Turbidity meter or equal equivalent is utilized.
The unit is calibrated prior to use in accordance with the unit’s operations manual by field
personnel. Groundwater samples are collected in glass containers for measurement by the
instrument. The glass containers are washed with bottled-water between each measurement
collection. Once the sample is collected and inserted into the instrument, the measurements
displayed by the instrument are then recorded.
UVF TRILOGY ANALYTICAL REPORT
Project Name: 280 Ervin Woods Drive
Project Number: 03323
Date: 3/31/2023
Standard Technical Procedures
The UVF TRILOGY instrument is a fixed-wavelength fluorometer but uses deep UV LEDS to detect
monoaromatic and polyaromatic hydrocarbons.
SITELAB’s CAL-025 GRO Module is used to detect volatile petroleum hydrocarbons in the C6 to C10 range.
This test matches well to EPA Methods for GRO, BTEX, BPH or VOC’s using GC/FID instrumentation.
SITELAB’s CAL-042 EDRO Module is used to detect petroleum hydrocarbons in the C10 to C36 diesel and
oil range. This test matches well to EPA methods for TPH, EPH, DRO, and others using GC-FID
instrumentation.
Prior to field usage, the UVF TRILOGY is calibrated with five calibration standard solutions per targeted
analyte.
Soil samples are weighed to the nearest gram (i.e. 5.0 g) and added to a 1-ounce HDPE Nalgene bottle
with a measured amount of laboratory grade methanol to the nearest mL (i.e. 10 mL) to create a sample
extract. After addition of both the soil and methanol, the bottle is agitated for several minutes. Next, the
sample rests for several minutes allowing for the soil and methanol extract to separate.
After ample resting time, the methanol extract is collected with a syringe. A filter is connected to the end
of the syringe and dispensed into a clean sample test tube. The test tube is labeled with sample ID and
extract dilution factor (i.e. 2X).
Known amounts of extract are pipetted into a second test tube and diluted with methanol. The sample
ID and dilution factor are labeled on the test tube (i.e. 100X).
Samples are placed into a clean cuvette and carefully inserted into the selected UV Module. Prior to
analyzing the sample, the stored calibration that matches the UV Module being used, is selected. The
UVF TRILOGY produces a result that when multiplied to the dilution factor equals the true TPH value.
Quenching occurs when the detector is swamped by too many or certain type of hydrocarbons, producing
low or negative concentrations. The sample is tested at multiple dilutions to confirm the results are linear
and accurate.
Solvent blank samples are periodically analyzed to confirm the solvent is clean and the calibration of the
machine is maintained.
UVF Analytical Report
Project Name 280 Ervin Woods Dr
Project Number 03323
Method UVF Trilogy
Sample Name Sample Depth Sample Date Analyte Name Dilution Result MDL Units
SB1 13-15 3/30/2023 DRO 500 2720 50 mg/kg
SB1 13-15 3/30/2023 GRO 500 1610 250 mg/kg
Friday, March 31, 2023 Page 1 of 4
Project Name 280 Ervin Woods Dr
Project Number 03323
Method UVF Trilogy
Sample Name Sample Depth Sample Date Analyte Name Dilution Result MDL Units
SB2 10-12 3/30/2023 DRO 500 1830 50 mg/kg
SB2 10-12 3/30/2023 GRO 500 2795 250 mg/kg
SB2 13-15 3/30/2023 DRO 500 1670 50 mg/kg
SB2 13-15 3/30/2023 GRO 500 2795 250 mg/kg
Friday, March 31, 2023 Page 2 of 4
Project Name 280 Ervin Woods Dr
Project Number 03323
Method UVF Trilogy
Sample Name Sample Depth Sample Date Analyte Name Dilution Result MDL Units
SB3 8-10 3/30/2023 DRO 500 320 50 mg/kg
SB3 8-10 3/30/2023 GRO 500 370 250 mg/kg
Friday, March 31, 2023 Page 3 of 4
Project Name 280 Ervin Woods Dr
Project Number 03323
Method UVF Trilogy
Sample Name Sample Depth Sample Date Analyte Name Dilution Result MDL Units
SB5 8-10 3/30/2023 DRO 2 8.38 0.2 mg/kg
SB5 8-10 3/30/2023 GRO 2 <1 1 mg/kg
Friday, March 31, 2023 Page 4 of 4