AS-86094_86094_CA_MRP_20230608_TableMap

Norfolk Southern Corporation Daniel Hunt, P.G. Law Department Senior Manager Environmental Remediation 650 West Peachtree Street NW Atlanta, GA 30308 404-273-4472 [e-mail]
Operating Subsidiary: Norfolk Southern Railway Company
June 8, 2023
Via E-mail
Ms. Maura Clark
Hydrogeologist Asheville Regional Office Underground Storage Tank Section, Division of Waste Management
2090 U.S. Highway 70 Swannanoa, NC 28778 Re: Notice of Regulatory Requirements 15A NCAC 02L.0110(d) [Intermediate Risk] Risk-based Assessment and Corrective Action Asheville, Buncombe County, North Carolina
Norfolk Southern Railway AST Release
70 Meadow Road Buncombe County Incident Number: 86094
Risk Classification: Intermediate Ranking: 000
Dear Ms. Clark:
In response to North Carolina Department of Environmental Quality’s (NCDEQ) letter dated February 2, 2023, requesting semi-annual groundwater sampling events to take place concurrent with free product gauging activities, Geosyntec Consultants of NC, P.C. (Geosyntec) compared the March 2016 and December 2016 groundwater results (Table 1) to contemporary Gross Contaminant Levels (GCLs). Upon review, no exceedances were identified. Due to the lack of GCL exceedances and the inability to pursue site closure until free product is no longer detected, Norfolk Southern proposes conducting one groundwater sampling event in 2023 to document current concentrations of analytes in the groundwater in addition to the approved semi-annual free product gauging activities. Norfolk Southern does not anticipate collecting any additional groundwater samples, with the exception of the individual 2023 sampling event, until free product is no longer detected during free product gauging activities.
Attached for your review is Table 1, Groundwater Sample Results – 2016 and Figure 1, AST Area Monitoring Well Locations – 2023. If you have any technical questions, please feel free to contact Mr. Tyler McNabb of Geosyntec at 865-330-0037 or Mr. Beau Hodge of Geosyntec at
919-424-1828.

2
Sincerely,
Daniel Hunt, P.G. Senior Manager Environmental Remediation
Attachments: Groundwater Sample Results – 2016
AST Area Monitoring Well Locations – 2023

Table 1
Groundwater Analytical Results
Asheville Mechanical Facility AST
70 Meadow Road
Asheville, North Carolina
NSRC Project # SA99036001
NCDEQ Incident # 86094
1 of 1
Area of SiteWell ID AAMW-6 RW-3Sample ID AAMW-3-0216 AAMW-3-1216 AAMW-4-0216 AAMW-4-1216 AAMW-5-0216 AAMW-5-1216 AAMW-6-1216 RW-1-0216 RW-1-1216 RW-2-0216 RW-2-1216 RW-3-0216
Sample Date 3/1/2016 12/13/2016 3/1/2016 12/14/2016 3/1/2016 12/13/2016 12/15/2016 3/2/2016 12/15/2016 3/1/2016 12/14/2016 3/1/2016
GCL Standard
Benzene µg/L 5000 <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U
Ethylbenzene µg/L 80,000 <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5UTolueneµg/L 260,000 <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U
Xylene Total µg/L 50,000 <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U
Chlorinated Hydrocarbons Hexachlorobutadiene µg/L 400 <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U
1,2,4-trichlorobenzene µg/L 24,500 <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U1,2-dichlorobenzene µg/L 20,000 <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U1,3-dichlorobenzene µg/L 61,500 <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U405<0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U
2,4,6-trichlorophenol µg/L 4000 <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5UJ <0.5U 2 <0.5U <0.5U <0.5UJ
2,4-dichlorophenol µg/L 980 <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5UJ300<1U <1U <1U <1U <1U <1U <1UJ <1U <1U <1U <1U <1U1-Methylnaphthalene µg/L 1000 0.12 0.14 0.51 4.6 0.018J <0.01U 1.7 94 160 29 0.081 0.27100,000 <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5UJ <0.5U <0.5U <0.5U <0.5U <0.5U2-methylnaphthalene µg/L 12,000 0.025J <0.052U 0.059 0.33 <0.011U <0.01U 1 7.7 73 3.6 <0.051U 0.029J19500.14 0.28 1.5 4.1 <0.011U <0.01U 0.15 5.6 14 3.4 1.2 0.051
8000 0.019J <0.01U <0.011U 0.66 <0.011U <0.01U 0.031J <0.011U <0.1U <0.01U 0.062 <0.01U
Anthracene µg/L 2000 0.03J 0.053 0.28 0.25 <0.011U <0.01U 0.027J 0.51 5.2 0.89 0.16 <0.01UBenz(a)anthracene µg/L 4.7 <0.01U 0.013J <0.011U <0.01U <0.011U <0.01U <0.01U <0.053U 0.2J <0.052U <0.01U <0.01UBenzo(a) pyrene µg/L 0.8 <0.01U <0.01U <0.011U <0.01U <0.011U <0.01U <0.01UJ <0.011U <0.1U <0.052U <0.01U <0.01UBenzo(b)fluoranthene µg/L 0.75 <0.01U <0.01U <0.011U <0.01U <0.011U <0.01U <0.01U <0.053U 0.15J <0.052U <0.01U <0.01U
Benzo(g,h,i)perylene µg/L 200 <0.01U <0.01U <0.011U <0.01U <0.011U <0.01U <0.01UJ <0.011U <0.1U <0.052U <0.01U <0.01U
Benzo(k)fluoranthene µg/L 0.5 <0.01U <0.01U <0.011U <0.01U <0.011U <0.01U <0.01U <0.011U <0.1U <0.052U <0.01U <0.01U
Chrysene µg/L 5 <0.01U <0.01U <0.011U <0.01U <0.011U <0.01U <0.01U <0.053U 0.23J 0.063 0.019J <0.01UDibenz(a,h)anthracene µg/L 1.2 <0.01U <0.01U <0.011U <0.01U <0.011U <0.01U <0.01U <0.011U <0.1U <0.01U <0.01U <0.01UFluorantheneµg/L 300 <0.01U 0.014J 0.033J 0.041J <0.011U <0.01U <0.01U 0.084 1.1 0.21 0.079 <0.01UFluoreneµg/L 845 0.21 0.54 2.3 6.2 <0.011U <0.01U 0.28 8.2 32 5 0.31 0.0840.095 <0.01U <0.01U <0.011U <0.01U <0.011U <0.01U <0.01UJ <0.011U <0.1U <0.052U <0.01U <0.01U
Naphthalene µg/L 6000 0.057J 0.052J <0.032U 0.23 <0.032U <0.03U <0.03U <0.032U 4 <0.031U 0.52 0.04J
550 <0.031U <0.031U 0.16 0.18 <0.032U <0.03U 0.29J 3.2 47 2 0.077 <0.03UPhenolµg/L 30,000 <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U2000.041J 0.064 0.11 0.093 <0.011U <0.01U <0.01U 0.23 3.9 0.82 0.22 <0.01U
Phthalates Bis(2-ethylhexyl) phthalate µg/L 135 <2U <2U <2U <2U <2U <2U <2U <2U <2U <2U <2U <2U
SVOCs Bis(2-chloroethyl)ether µg/L 30 <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U <0.5U
Notes:
2. Only analytes with available GCL Standard are shownµg/L - micrograms per literU - Non-detectionJ - Estimated value
AST - Aboveground Storage Tank
BTEX - Benzene, Toluene, Ethylbenzene, and XylenesPAH - Polyciclic Aromatic HydrocarbonsSVOCs - Semi-volatile Organic CompoundsShaded values represent values that exceed the GCL Standard
Bold values represent concentrations greater than the laboratory method detection limit.
AST Area
BTEX
UnitsAnalyte2Chemical Group
PAHs
Halogenated Phenols
Halogenated Benzenes
&<
&<
&<@?
ED
EDED
RW-3
RW-1
RW-2
AAMW-6
AAMW-5
AAMW-3
AAMW-4
0 100Feet
³Asheville Mechanical Facility AST70 Meadow RoadAsheville, North CarolinaNSRC Project # ENVREM-96NCDEQ Incident # 86094
AST Area Monitoring Well Locations
Figure
1May 2023
Legend
&<Type II Monitoring Well
@?Typle III Monitoring Well
ED Recovery Well - Abandoned April
2021
ED Recovery Well
Notes
The aerial photograph was acquired
on 08 February 2022.