MO-9430_40865_CA_FPR_20230501

FREE PRODUCT RECOVERY REPORT

D.M. BOWMAN, INC.
12801 Mt Holly-Huntersville Road
Huntersville, Mecklenburg County, NC 28078 Facility ID #: 00-0-0000013713; UST Incident #: 40865
LATITUDE: N 35.408654o; LONGITUDE: W 80.852669o (From GPS)

April 29, 2023

UST OWNER:
D.M. Bowman, Inc., 12801 Mt Holly-Huntersville Road
Huntersville, NC 28078; Phone Number: [phone]
PROPERTY OWNER:
The Bowman Group, 10228 Governor Lane Blvd, #3002, Williamsport, MD 21795
Occupant: D.M. Bowman, Inc.
CONSULTANT: Henry Nemargut Engineering Services, 2211 Chestnut Street, Huntersville, NC 28405 Phone Number: [phone]
RELEASE INFORMATION: Date Discovered: 11/14/18 Estimated Quantity of Release: Unknown Cause of Release: Mechanical Failure; Source of Release: Leaking Spill Bucket Size and Contents: (1) 20,000 Gallon Diesel UST; (1) 8,000 Gal Used Oil UST (1) 6,000 Gallon Motor Oil UST
The Free Product Recovery Report for this site has been prepared by Henry Nemargut Engineering Services (sole proprietorship) under the direct supervision of a licensed engineer. I certify that the information contained in this report is correct and accurate to the best of my knowledge:
Henry Nemargut, P.E.
Henry Nemargut Engineering Services North Carolina License #17669

April 29, 2023

Jason Perea
D.M. Bowman, Inc.
12801 Mt Holly-Huntersville Road
Huntersville, NC 28078

Reference: Free Product Recovery Report
D.M. Bowman, Inc.
12801 Mt Holly-Huntersville Road
Huntersville, Mecklenburg County, North Carolina 28078
Facility ID#: 0-013713; Incident #40865

Dear Mr. Perea:

In accordance with the requirements of the North Carolina Department of Environmental Quality
(NCDEQ), contained herein is a Free Product Recovery Report for the release which occurred at
the above referenced facility. These activities have been conducted following the discovery of
free product in the vicinity of USTs at this facility. All activities were conducted in accordance
with NCDEQ guidelines and the requirements of 15A NCAC 2N.

If you have questions regarding this report, please contact our office.

Sincerely,

Henry Nemargut, P.E.
Henry Nemargut Engineering Services

TABLE OF CONTENTS

Page A. Title Page .................................................................................. i B. Site Status and Conclusions B.1 Introduction and Scope of Services ............................... 1 B.2 Free Product Thickness .................................................. 1 B.3 Groundwater Flow Direction and Gradient ................... 1 B.4 Conclusions .................................................................... 2 B.5 Limitations ..................................................................... 3 C. Figures
Figure 1: Project Location Figure 2: Site Layout and UST Locations Figure 3: Site Layout and Monitor Well Locations Figure 4: Free Product Thickness Map (2/27/23) Figure 5: Potentiometric Surface Map (2/27/23)

D. Tables
Table 1: Free Product Recovery Data Table 2: Air Emission Calculations Table 3: Groundwater Elevation Data

E. Appendices
Appendix A: Liquids Disposal Manifest Appendix B: Well Construction Records
Page - 1
FREE PRODUCT RECOVERY REPORT D.M. Bowman, Inc. 12801 Mt Holly-Huntersville Road, Huntersville, NC 27612
Facility ID#: 00-0-0000013713; GW Incident #: 40865

B. Site Status and Conclusions
B.1 Introduction and Scope of Services
D.M. Bowman, Inc., owns USTs which are operated at the D.M. Bowman, Inc. facility located at 12801 Mt Holly-Huntersville Road in Huntersville, North Carolina. Figure 1 illustrates the location of this facility on the Cornelius Quadrangle U.S.G.S. Topo Map. The project site contains one permanent structure used as a maintenance garage. The site contains (1) 20,000 gallon Diesel, (1) 8,000 gallon Used Motor Oil & (1) 6,000 Motor Oil underground storage tanks (USTs). The locations of the USTs and the site layout are illustrated on Figure 2. A release was discovered at this site during a NCDEQ compliance inspection by visual observation of diesel product in a breached diesel spill bucket. Based on the results of this inspection, Jerren Rogers of the NCDEQ UST Inspections Section directed D.M. Bowman to conduct a site check around the leaking spill bucket. Based on the observation of free product, D.M. Bowman elected to conduct remedial excavation in the vicinity of the leaking diesel spill bucket. The site and adjacent properties are used for commercial/industrial purposes. Municipal water supplies are available to all properties within 1,500’. On May 30, 2019, monitoring well MW-1 was gauged and found to contain 9.56’ of floating non-aqueous phase petroleum free product. Based on the discovery of the free product at the site, prior AFVR recovery events were conducted in June, 2019, October, 2019, March, 2020, July 28, 2020, October 21, 2020, February 24, 2021, and July 22, 2021 and December 14, 2021. This report contains a summary of recovery and monitoring efforts conducted on February 27, 2023. B.2 Free Product Recovery
Product Type, Thickness, and Rate of Return
Free product was observed in monitoring well MW-1 at a thickness of 7.75’, in RW-1 at a thickness of 0.19’, and in MW-3 at a thickness of 0.01’on February 27, 2023 prior to the AFVR event. The type of free product discovered consisted of high boiling point hydrocarbons in the form of diesel/used motor oil. An estimated 15 gallons of petroleum liquids were recovered during the February 27, 2023 AFVR event, with an additional 0.31 gallon recovered as vapors. Immediately following completion of the AFVR event on July 29, 2022, no free product was measured in MW-1, MW-3 or RW-1. Table 1 contains free product recovery and thicknesses before and after the AFVR event. Figure 3 illustrates monitoring well locations, and Figure 4 contains a free product thickness map. Table 2 contains air emission contaminant recovery calculations for the AFVR event conducted at this facility.
Manual Product Recovery
No manual product recovery has been performed at this facility.
Page - 2
Aggressive Fluid Vapor Recovery (AFVR)
An AFVR event was performed on February 27, 2023 for an 8 hour period at this site in monitor well MW-1, RW-1 and MW-3. Prior to initiation of the AFVR event on this date, free product was measured in MW-1, RW-1 and MW-3. A total of 1700 gallons of contaminated groundwater and floating free product were recovered during the field activities on this date.
The recovered product was disposed by Terra Nova Solutions of High Point, NC. A copy of the liquids disposal manifest for this material is included in Appendix A. The Pollutant Mass Removal rate was calculated at 0.31 gallons during the AFVR event. Well construction records are contained in Appendix B.
B.3 Groundwater Flow Direction and Gradient
In order to estimate the groundwater flow direction in the vicinity of the petroleum release, elevations of the monitor well casings were measured using surveying equipment. During the February 27, 2023 gauging event, static water levels were obtained from the monitor wells (see Table 3) and the data was used to compute a potentiometric surface map. Figure 5 illustrates the current potentiometric surface map as calculated based on the measurements obtained on February 27, 2023.
Groundwater data and monitoring well information were also used to estimate the hydraulic gradient at the project site. Using the horizontal distance between the monitor wells and the static water levels, the groundwater was calculated to flow toward the southwest with a hydraulic gradient of approximately 0.0036 ft/ft.

B.4 Conclusions
Free Product Recovery activities at D.M. Bowman, Inc. have been conducted. From a review of all information gathered during this project, Henry Nemargut Engineering Services makes the following conclusions:

o Approximately 15 gallons of free product and 1700 total gallons of liquids were recovered from MW-1, RW-1 and MW-3 during an AFVR event performed on February 27, 2023. The free product resembled mixed diesel/used motor oil.

o The product and groundwater recovered during the AFVR event were disposed by Terra Nova Solutions of High Point, NC.

o Immediately following completion of the AFVR event on July 29, 2022, no free product measured in MW-1, MW-3 or RW-1.

Based upon a review of all information gathered during this project, HNE recommends the following actions in regard to the release at D.M. Bowman, Inc.:

o Free product recovery via AFVR events should be conducted at this facility on a semi-annual basis since this methodology is resulting in effective removal.

Page - 3
o Installation of additional monitoring/recovery wells should be considered to increase recovery rates during AFVR events.

o A copy of this report has been forwarded to the following address:
Mr. Daniel Bowser NCDEQ – UST Section 610 East Center Avenue, Suite 301 Mooresville, NC 28115

B.5 Limitations
The observations made in this and all previous reports are under the conditions stated within these reports and during the time periods referenced. In no event shall Henry Nemargut Engineering Services, its employees, agents, or representatives be liable for consequential or incidental damages. Henry Nemargut Engineering Services' obligations and liabilities to D.M. Bowman, Inc. or their successors and assigns are limited to fraudulent statements herein or gross negligence. We believe the data obtained during the monitoring of this site provides sufficient information upon which to base our judgment in reference to this contract.

FIGURES
FIGURE 1: PROJECT LOCATION - USGS TOPO MAP
Project Location

TABLES
TABLE 1Free Product Recovery & Elevation DataD.M. Bowman, Inc., 12801 Mt Holly-Huntersville Rd, Huntersville, NC 28078Monitor Well # Free Product Thickness Depth to Free Product Depth to Water Method of Product Prior to/after Recovery Prior to/after Recovery Prior to/after Recovery Product Recovery Recovered (gal.) Date - Well 6/6/19 - MW-1 9.45'/0.02' 19.65'/28.43' 29.12'/28.45' AFVR 9310/31/19 - MW-1 7.32'/0.01' 21.94'/28.50' 29.26'/28.51' AFVR 5110/31/19 - MW-3 0.58'/0.00' 22.70' - n/a 23.28'/27.78' AFVR 13/4/20 - MW-1 6.11'/0.07' 19.65'/20.44' 25.76'/20.51' AFVR 203/4/20 - MW-3 0.02'/0.00' 20.36' - n/a 20.38'/20.42' AFVR 33/4/20 - RW-1 0.15'/0.01' 20.67'/20.75' 20.78'/20.76' AFVR 17/28/20 - MW-1 8.10'/0.12' 20.80'/21.72' 28.90'/21.84' AFVR 247/28/20 - MW-3 0.04'/0.01' 21.56'/21.49' 21.60'/21.50' AFVR 17/28/20 - RW-1 0.20'/0.01' 21.95'/21.99' 22.15'/22.00' AFVR 12 10/20/20 - MW-1 4.21'/0.05' 21.19'/28.27' 25.40'/28.32' AFVR 18 10/20/20 - MW-3 0.01'/0.00' 21.51' - n/a 21.53'/26.85' AFVR 010/20/20 - RW-1 1.57'/0.01' 21.93'/30.06' 23.50'/30.07' AFVR 6 2/24/21 - MW-1 5.31'/0.06' 19.25'/19.99' 24.56'/20.05' AFVR 16 2/24/21 - MW-3 0.01'/0.01' 19.75'/19.90' 19.76'/19.91' AFVR 02/24/21 - RW-1 0.09'/0.03' 20.15'/20.25' 20.24'/20.28' AFVR 4 7/22/21 - MW-1 6.82'/0.02' 20.32'/28.02' 27.17'/28.04' AFVR 36 7/22/21 - MW-3 0.03'/0.00' 21.03' - n/a 21.03/27.34' AFVR 07/22/21 - RW-1 0.21'/0.01' 20.15'/28.47' 21.61'/28.48' AFVR 3 12/14/21 - MW-1 5.62'/0.03' 22.48'/23.14' 28.10'/23.17' AFVR 26 12/14/21 - MW-3 0.28'/0.00' 22.85 - n/a 23.13'/22.96' AFVR 112/14/21 - RW-1 0.13'/0.00' 23.35' - n/a 23.48'/23.41' AFVR 1 7/28/22 - MW-1 8.03'/0.02' 21.67'/25.89' 29.70'/25.91' AFVR 16 7/28/22 - MW-3 0.03'/0.00' 22.37 - n/a 22.40'/26.06' AFVR 07/28/22 - RW-1 0.13'/0.00' 22.80' - n/a 22.93'/30.01' AFVR 1 2/27/23 - MW-1 7.75'/0.00' 19.95'/28.49' 27.70'/28.49' AFVR 14 2/27/23 - MW-3 0.01'/0.00' 20.67 - n/a 20.68'/25.66' AFVR 02/27/23 - RW-1 0.19'/0.00' 21.10' - n/a 21.19'/29.41' AFVR 1TOTAL RECOVERED TO DATE = 349All free product measurements conducted with a Heron oil/water interface probe.
TABLE 2
AIR EMISSIONS CALCULATIONS
D.M. BOWMAN, INC., 12801 MT HOLLY-HUNTERSVILLE RD, HUNTERSVILLE
27-Feb-23
Data Entry (Enter data into shaded cells only)
Bwsw = lb. Water/lb. Dry air = 0 lb./lb. (from humidity probe)
Bws = water vapor as % by volume = 0 % (from guidelines)
V = velocity in ft/min = 920 fpm (from pitot tube)
V = velocity in ft/sec = 15.33333333 fps (from pitot tube)
d = diameter of discharge [in.] = 6 in. (diameter of exhaust pipe)
A = cross-sec. Area of discharge = 0.196349375 sq. ft. (Area of exhaust pipe)
Ts = stack Temp. degrees R = 675 deg. R (from guidelines)
Tf = stack Temp. deg. F = 215 deg. F (from Temp. probe)
PPMw = ppm measured = 130 ppm (from TLV meter)
1. Calculate Flow as Dry Standard Cubic Feet Per Minute (DSCFM).
Qstd = flow at DSCFM = 141.3017369 dscfm
2. Determine Pollutant mass Removal Rate as Gasoline (PMRg).
PPMw = PPMm = obtained value from TLV meter = "wet" concentration = 130
PPMd = (PPMw)/(1-Bws) = "dry concentration = 130
K = # carbons in calibration gas = Khexane = 6) = 6
PPMc = (PPMd)*(K) = PPMv, vol. Conc. Of VOCs as carbon, dry@STP =780
Mc = 12.01 mg/mg-mol, mw of carbon = 12.01
K3 = 24.07 dscm/1E6 mg-mg-mol, mass to vol. Conv. Factor @STP =24.07
Ccm = PPMc*(Mc/K3) = mg/dscm, mass conc. Of VOC as carbon = 389.189863
Cc = Ccm*(62.43E-9 lb.-m3/mg-ft3) = lb./dscf, mass conc. Of VOCs as carbon, dry@STP =2.4297E-05
PMRc = Cc*Qstd*60 min/hr) = lb./hr, poll. Mass rem. Rate of VOCs as carbon =0.20599354
Mg = 103 mg/mg-mol, mw of gasoline (value may vary depending on contaminant) = 103
Mcg = 89 mg/mg-mol, weight of carbon in gasoline molecule = 89
PMRg =
PMRg = (PMRc)*(Mg/Mcg) = lb./hr, pollutant mass removal rate of VOCs as gasoline = 0.23839702 lb./hr
3. Convert lbs. Of gasoline emissions to gallons of liquid gasoline.
PMRgl =
PMRgl = (PMRg)*(gal/6.25 lbs.) =Mass Removal Rate as Gasoline in Gallons/hour =0.03814352 gal/hr
Duration of Event (hrs)8 Total Gal Discharge
AfvrEmis 0.30514819 Gallons
TABLE 3Monitoring Well Information and Groundwater ElevationsD.M. Bowman, Inc., 12801 Mt Holly-Huntersville Rd, Huntersville, NC 28078Well Number Top of Casing Elev Top of Screen Elev Bottom of Screen Elev Depth to FP Depth to Water Groundwater ElevationMW-1 99.70 89.70 69.70 19.95 27.70 78.74MW-2 100.00 87.00 72.00 20.97 79.03MW-3 99.53 86.53 71.53 20.67 20.68 78.86MW-4 99.50 86.50 71.50 20.74 78.76MW-5 99.46 81.46 66.46 20.66 78.80MW-6 99.26 81.26 67.26 20.43 78.83RW-1 99.96 84.96 64.96 21.10 21.29 78.84Density of 15W-40 Motor Oil = 0.87All measurements taken in feet and based on an arbitrary benchmark of 100 ft. established at MW-3Groundwater levels measured on 2/27/2023Groundwater levels adjusted for Free Product

APPENDIX A

LIQUIDS DISPOSAL MANIFEST

APPENDIX B

WELL CONSTRUCTION RECORDS

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3426-A
Henry Nemargut
Henry Nemargut Engineering Services
2211 Chestnut Street
Wilmington NC 28405
910 762-5475
MW-1
X
1/15/19
12:00 XX
Huntersville Mecklenburg
12801 Mt Holly-Huntersville Rd, Huntersville, NC 28078
X
35.396664
80.852669
X
0-013713
D.M. Bowman, Inc.
12801 Mt Holly-Huntersville Road
Huntersville NC 28078
Jason Perea
12801 Mt Holly-Huntersville Road
Huntersville NC 28078
240 500-6155
30'
X
20.74
0
0'10'2"Sch 40 PVC
0'6'Portland Pour
6'9'Bentonite Pour
10'30'2 0.01 PVC
9'30'#2 Filter Sand
0' 1'gray, Gravel (ABC)
1' 11'orange-brown-red, Silt w/clay
11' 15'lt gray w/red, Silt w/clay
15' 27'red-tan-gray, Silt w/clay
27' 30'lt-gray, Silt w/some clay and sand
HENRY NEMARGUT 1/29/2019