23048_Metrolina Speedway_DecisionMemo_20200629

DECISION MEMORANDUM DATE: June 29, 2020 FROM: Jordan Thompson
TO: BF Assessment File RE: Metrolina Speedway 4816 Gibbon Road Charlotte, Mecklenburg County
Brownfields Project No. 23048-19-060 Based on the following information, it has been determined that the above referenced site, whose intended use is for no uses other than office, industrial, and with prior written DEQ approval, other commercial uses, can be made suitable for such uses.
Introduction: The Brownfields Property consists of one parcel of land totaling 43.1449 acres of land (Mecklenburg County Parcel # 03720301). The property is currently developed with two residences and an abandoned speedway track with associated bleachers. An Environmental
Management Plan (EMP) has been approved for the redevelopment of the property into a multi-tenant industrial warehouse park. Redevelopment Plans: The PD intends to redevelop the property with an industrial warehouse park to expand
operations on the adjacent Metrolina Expo property (Brownfields Property # 20034-16-060). Site History: The northern portion of the Brownfields Property was developed with a dirt/asphalt
speedway racing track in the 1960s and 1970s. Race track operations ceased in the 1980s and from 1991 to approximately 2003, a small portion of the property was reportedly utilized for a petroleum land farming operation to remediate impacted soils from off-site properties (NC DEQ Permit # SR300078). Portions of the former race track were also used for rodeos and animal paddocks. Since 2003, the parcel has remained vacant land. There
is also reportedly the potential that the Brownfields Property was utilized as part of an airfield in the past. The south eastern portion of the Brownfields Property was developed with residences in the 1950s and remain as such as of early 2020. A small portion of the former Metrolina Expo Brownfields Property (portion of Parcel
#03720345 totaling approximately 0.0651 acres) was transitioned to the Metrolina
Speedway property and the Metrolina Speedway Agreement supersedes that portion of the Metrolina Expo Agreement. The transitioned portion of land appears to have historically been vacant/agricultural land.
Potential Receptors:
Potential receptors are: construction workers, on-site workers, visitors, and trespassers. Contaminated Media: DEQ has evaluated data collected from the following media at the subject property: soil, groundwater, surface water, sediment, and soil gas. DEQ relies on the following data to
base its conclusions regarding the subject property and its suitability for its intended reuse.
Soil Soil was sampled as part of Brownfields Assessment activities in November 2019 and as part of due diligence assessment in 2017. Soil was sampled to assess for potential impacts
from the former petroleum land farm operations as well as the former racetrack. Impacts of arsenic were identified above Industrial/Commercial PSRGs at concentrations that are considered to likely be naturally occurring for the area. Sediment evaluations also identified arsenic above Industrial/Commercial PSRGs but at
concentrations that are likely naturally occurring. The risk calculator summary below outlines the potential risk to site occupants for soil exposure.
Groundwater Groundwater was sampled as part of Brownfields assessment activities. Two temporary monitoring wells were installed on the property that did not identify impacts above NC DEQ 2L Groundwater Standards.
The risk calculator summary below outlines the potential risk to site occupants for groundwater exposure as well as vapor intrusion.

Surface Water An on-site surface water pond was sampled as part of Brownfields Assessment Activities
that identified impacts of lead above 2B Surface Water Standards. The risk calculator summary below outlines the potential risk to site occupants for surface water exposure.

Soil Vapor Soil vapor samples were collected within the footprint of the planned site building for analysis of VOCs by EPA Method TO-15. While detections of VOCs were present, no impacts were identified above Non-residential Vapor Intrusion Screening Levels (VISLs).

Sub-Slab Vapor
Based on the planned demolition of on-site structures, no sub-slab samples were collected.

Indoor Air Based on the planned demolition of on-site structures, no indoor air samples were collected.
Risk Calculations
The DEQ Risk Calculator was developed to evaluate the risk of multiple contaminants and multiple exposure routes associated with contaminated environmental media at a site. The risk evaluation procedures, equations, and default parameters used to create the calculator follow the current USEP risk assessment guidance. The DEQ Risk Calculator dated December 2019 was used to evaluate the following.
The Brownfields Property was evaluated using the highest concentrations from all samples to create a worst case scenario. The risk calculations indicated the following based on available data, including the following media: groundwater, soil, soil gas, sediment, and surface water samples:

Medium Site Area Non-Residential
LICR HI
Groundwater Exposure Site Wide 7.5 E-06 0.038
Groundwater Vapor Intrusion Site Wide 1.3 E-06 0.0016
Soil Vapor Site Wide 4.0 E-06 0.052
Soil Site Wide 1.6 E-06 0.013
Sediment On-site Pond 1.4 E-06 0.01
Surface Water
(Recreator/Trespasser) On-site Pond 1.1 E-06 0.02
Red shading LICR> 1E-04 or HI> 1. LICR = Lifetime Incremental Cancer Risk HI = Hazard Index Based on the planned reuse of the Brownfields Property for an industrial warehouse park
and the above risk calculations, it appears that the site can be made suitable for the intended reuse with the following land use restrictions. Post Recordation Unit - An EMP has been approved for the current redevelopment
- VI not a concern for the currently planned buildings based on the above RCs. VI LUR included for future buildings. Required Land Use Restrictions: Based on the site-specific data provided to the Brownfield program, the site reuse is
suitable for the site as long as the agreed upon land use restrictions in the BFA are abided by. - No child or adult care centers or schools without DEQ approval - No groundwater use
- No soil disturbance without DEQ approval
- Soil import/export must be approved by DEQ - VI Compliance requirement - No surface water use except storm water collection/reuse - DEQ notification of building demo
- EMP required for redevelopment
- Redevelopment Summary Report - DEQ shall be allowed access - Deed conveyance of the NBP - Known contaminants may not be stored on the property - LURU submittal