4.19.13 Schneider Electric / Investigation Summary Report_Final 041913-1

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Results of Groundwater and Sub-slab SamplingFormer Square D Facility 128 Bingham Road Asheville, North Carolina4.19.2013

Transcript of 4.19.13 Schneider Electric / Investigation Summary Report_Final 041913-1

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Schneider Electric

Results of Groundwater and Sub-slab SamplingFormer Square D Facility 128 Bingham Road Asheville, North Carolina

April 19, 2013

Table of Contents

Executive Summary 1. Background1.1 1.2 1.3 Site Description Site History Site Geology and Hydrogeology

vi 1-11-4 1-4 1-6

2. Methods Used in Recent Investigations2.1 On-site Investigation Activities at Plant 1 2.1.1 2.1.2 Expanded Semiannual Groundwater Monitoring Event Plant 1 Sub-Slab and Air Investigation Planning Surveys 2.1.2.1 2.1.2.2 2.1.3 Building Survey Prior to Sub-Slab Investigation HVAC/Air Flow Survey

2-12-2 2-2 2-2 2-2 2-3 2-4 2-5 2-6 2-7 2-7 2-7 2-7 2-8 2-9

Sub-Slab Investigation 2.1.3.1 2.1.3.2 Sample Port Installation Sub-Slab Sample Collection

2.2

Off-site Investigation Activities at BCBOE Property 2.2.1 2.2.2 2.2.3 2.2.4 Expanded Semiannual Groundwater Monitoring Event Additional Off-site Groundwater Monitoring (MW-20D) Installation of Monitoring Well MW-26 Groundwater Sample Collection

2.3

Investigation Derived Waste

3. Results3.1 3.2 Water Levels On-site Investigation Results for Plant 1 3.2.1 3.2.2 3.2.3 3.2.4 Groundwater Analytical Results VI Screening of Groundwater Results Building Characteristics and HVAC/Air Flow Summary Sub-Slab Analytical Results

3-13-1 3-1 3-1 3-2 3-3 3-4

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Table of Contents

3.3

Off-site Investigation Results for BCBOE 3.3.1 Groundwater Analytical Results and VI Screening

3-5 3-5

4. Conclusions and Recommendations4.1 4.2 On-site Investigation at Plant 1 Off-site Investigation at BCBOE Property

4-14-1 4-1

5. Reporting and Schedule 6. References

5-1 6-1

ii

Table of Contents

Tables1 2 3 4 5 Summary of Recent Correspondence Groundwater Elevations November 26, 2012 Groundwater Analytical Results Related to Vapor Intrusion Screening Most Recent Groundwater Analytical Results Sub-Slab Analytical and Screening Results

Figures1 2 3 4 5 6 7 8 9 Site Location Map Site Features Map Building Layout with Sub-Slab Results Shallow Groundwater Elevation Contour Map November 26, 2012 PCE Concentrations in Shallow Aquifer Groundwater Most Recent TCE Concentrations in Shallow Aquifer Groundwater Most Recent PCE Concentrations in Bedrock Groundwater Most Recent TCE Concentrations in Bedrock Groundwater Most Recent Proposed Indoor Air Sample Locations

AppendicesA B C D E F G Findings of Plant 1 Building Surveys Sub-Slab Port Installation and Sampling Documentation of Field Work Related to Wells MW-20D and MW-26 Investigation-Derived Waste Documentation Screening Evaluation of Former Plant 1 Groundwater and Sub-Slab Data Laboratory Reports for Sub-Slab Samples Indoor Air Sampling Plan

iii

Table of Contents

Acronyms and Abbreviations ARCADIS Air Toxics BCBOE bgs Champion CAP COPC CSA P cis-1,2-DCE DENR DO DWQ ELCR ESA HI HQ HVAC IHSB in Hg IDW IAQ NFA g/kg ARCADIS G&M of North Carolina, Inc. Eurofins Air Toxics, Inc. Buncombe County Board of Education below ground surface Champion Products Inc. Corrective Action Plan constituent of potential concern Comprehensive Site Assessment pressure differential cis-1,2-dichloroethene North Carolina Department of Environment and Natural Resources dissolved oxygen North Carolina Division of Water Quality Excess Lifetime Cancer Risk Environmental Site Assessment Hazard Index Hazard Quotient heating, ventilation, air conditioning Inactive Hazardous Sites Branch inches of mercury investigation derived waste indoor air quality No Further Action micrograms per kilogram

iv

Table of Contents

g/L ml ml/min NCAC ORP Pace PCE Plant 1 ppb PVC PWR QMP RI SE SESD TCE USEPA USGS VC VI VOC

micrograms per liter milliliter milliliters per minute North Carolina Administrative Code oxidation-reduction potential Pace Environmental Services, Inc. tetrachloroethene 128 Bingham Road Building parts per billion polyvinyl chloride partially weathered rock Quality Management Plan Remedial Investigation Schneider Electric Science and Ecosystem Support Division trichloroethene United States Environmental Protection Agency United States Geological Survey vinyl chloride vapor intrusion volatile organic compound

v

Results of Groundwater and Sub-slab SamplingFormer Square D Facility Asheville, North Carolina

Executive Summary The former Square D site is located at 128 Bingham Road (Plant 1), Asheville, North Carolina (the Site). The former Plant 2, which is not included as part of the definition of the Site, was owned and operated by Square D and located at 175 Bingham Road. Plant 2 was sold by Square D to the Buncombe County Board of Education (BCBOE) in 1989. Past use of former Plant 1 included production of electronic and electromechanical controls along with other electrical products. Plant 1 consists of approximately 266,300 square feet of building space located on a 14-acre tract of land that was sold by Square D to ASC Business Park LLC in April 2005. The former Plant 1 building is leased to a number of tenants which use their space for various manufacturing, warehousing, office and light industrial uses. Volatile organic compounds (VOCs) were detected in groundwater beneath the Site in early 1991. Constituents of potential concern (COPCs) in groundwater include tetrachloroethene (PCE), trichloroethene (TCE), and degradation products. Historically, investigation activities have been completed at the Site to delineate soil and groundwater impacts. An active pump and treat system is in place to remediate groundwater and provide hydraulic control of groundwater beneath Plant 1. Semiannual groundwater monitoring and reporting activities are also completed to document groundwater quality and operations and maintenance of the pump and treat system. Additional on-site and off-site remedial investigation activities were requested in a letter dated March 30, 2012 provided by North Carolina Department of Environment and Natural Resources (DENR). The primary requests in DENRs letter were the delineation of off-site groundwater impacts associated with Plant 1, on-site investigation of the potential for vapor intrusion (VI) at Plant 1, and off-site investigation of the potential for VI at the BCBOE property. In response to DENRs letter, Schneider Electric (formerly Square D Company) completed on-site and offsite investigation activities that included the following:

On-site investigations at the former Plant 1: Conducted an expanded groundwater monitoring event in May 2012; and Conducted two rounds of sub-slab sampling.

Off-site investigations at the BCBOE property:

vi

Results of Groundwater and Sub-slab SamplingFormer Square D Facility Asheville, North Carolina

Performed expanded groundwater sampling to include the monitoring well MW-15 cluster concurrently with the May 2012 semi-annual groundwater event. Sampled existing monitoring well MW-20D; and Installed and sampled a new shallow aquifer monitoring well.

The results of on-site and off-site investigation activities indicate the following: On-site Investigations at the Former Plant 1:

Groundwater sampling results indicated that concentrations of PCE and TCE within 100 feet of Plant 1 exceeded Inactive Hazardous Sites Branch (IHSB) generic VI screening levels for an industrial/commercial setting. Calculations of excess lifetime cancer risks (ELCRs) indicated that cancer risks were below the 1x10-4 target level set by DENR. However, cumulative non-cancer hazard indexes (HIs) were above the target HI of 1, triggering investigation of sub-slab vapor at Plant 1. Sub-slab vapor testing at Plant 1 indicated the presence of PCE and TCE in vapors underlying the building slab, at concentrations above IHSB generic industrial/ commercial screening levels. Calculations of ELCRs indicated that cancer risks were below the 1x10-4 target level set by DENR. However, cumulative non-cancer HIs were above the target HI of 1. The HI benchmark was exceeded at location MP-3 (beneath the basement). The vapor results trigger investigation of indoor air in the Plant 1 building, in accordance with the IHSB VI guidance.

Based on the results of sub-slab sampling at the former Plant 1, an on-site indoor air sampling program is required. The objective of indoor air sampling will be to determine whether the COPCs may have migrated into the building at levels that pose unacceptable risks to workers. The recommended indoor air sampling program includes the following:

Collection of 10 indoor air samples; Collection of six sub-slab samples at existing sampling ports, which will be collected simultaneously with indoor air samples;

vii

Results of Groundwater and Sub-slab SamplingFormer Square D Facility Asheville, North Carolina

Samples will be analyzed for the groundwater COPCs and degradation products: PCE, TCE, cis-1,2-dichloroethene (cis-1,2-DCE) and vinyl chloride (VC), using Method TO-15; and Two rounds of indoor air and simultaneous sub-slab sampling are anticipated, one in the near-term (outside of the heating season) and one in worst-case conditions, during the heating season.

Indoor air sample results will be compared to the IHSB industrial screening levels for indoor air. The sub-slab data will be used to evaluate whether any COPCs detected in indoor air are also present in the sub-slab space in similar proportions. Attenuation factors will be calculated to support this evaluation. The results of the indoor air evaluation will be used to determine if additional action is warranted. Off-site Investigations at the BCBOE Property:

Groundwater sampling results were below the detection limits for VOCs in monitoring wells MW-20D and MW-26. VOC results for mon