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Home My WebLink About09042_Scott Aviation_AWP_2016_02_19February 19, 2016 Mr. Stuart Rixman Scott Figgie LLC 34407 DuPont Boulevard, Suite 6 Frankford, DE 19945 RE: Addendum to the 2014 Environmental Site Assessment Work Plan - Voluntary Actions (Responsible Party-Driven) City of Monroe Brownfields Property Redevelopment 309 & 310 West Crowell Street Monroe, North Carolina Dear Mr. Rixman: AECOM Technical Services, Inc. (AECOM) has prepared this Addendum to the 2014 Environmental Site Assessment (ESA) Work Plan - Voluntary Actions (Responsible Party-Driven) on behalf of Scott Figgie LLC in support of Brownfields Development activities planned for the Former Scott Aviation Facility (the “Property”) located in Monroe, North Carolina. Execution of this Work Plan Addendum will generate data to supplement the existing Property data. Once these supplemental data and the data associated with the Revised Addendum to the 2014 Environmental Site Assessment Work Plan, Rev 01 (AECOM, February 19, 2016) have been collected, entire data set will be evaluated. An updated site conceptual site model (CSM) will be developed, and if data gaps exist, they will be identified and recommendations for additional data collection will be included in an ESA Report Addendum. The Property (Figure 1) includes two areas divided by Cromwell Street: Parcel I (Building I and south area) and Parcel II (Building II and north area). The Property is slated for redevelopment by the City of Monroe. Building I and Building II have been razed but the building foundations remain intact. This Work Plan Addendum presents follow-on investigation, sampling, and analytical laboratory test methods that will be utilized to collect supplemental data at the Property. In addition to these investigation activities, activities described in the Revised Addendum to the 2014 Environmental Site Assessment Work Plan, Rev 01 (AECOM, February 19, 2016) will be conducted upon NCDEQ approval of that Work Plan. Upon completion of the field activities described in both that Work Plan Addendum and this Work Plan Addendum, an ESA Report Addendum will be prepared and submitted to NCDEQ. PROJECT GOALS AND OBJECTIVES The objective of this project is to acquire the necessary data to further define areas targeted for remediation. The Addendum to the 2014 Environmental Site Assessment Work Plan was submitted on November 6, 2015; the Revised Addendum to the 2014 Environmental Site Assessment Work Plan was updated based on responses to NCDEQ comments and submitted on January 13, 2016. The Revised Addendum to the 2014 Environmental Site Assessment Work Plan included both activities planned in response to NCDEQ comments and voluntary activities. This Addendum to the 2014 - Voluntary Actions (Responsible Party-Driven) includes only Voluntary Actions (Responsible Party-Driven) investigation activities. NCDEQ-driven investigation activities are included in a separate Work Plan submitted to NCDEQ under a separate cover (e.g. Revised Addendum to the 2014 Environmental Site Assessment Work Plan, Rev 01 [AECOM, February 19, 2016]). The following activities are proposed in this Addendum to the 2014 Environmental Site Assessment Work Plan - Voluntary Actions [Responsible Party-Driven]: AECOM 10 Patewood Drive Bldg. VI, Suite 500 Greenville, South Carolina 29615 www.aecom.com 864 234 3000 tel 864 234 3069 fax Mr. Stuart Rixman February 19, 2016 Page 2 1. The existing overburden and bedrock monitoring well network will be sampled to measure current CVOC concentrations in groundwater. 2. Microbial samples will be collected from monitoring wells MW-2 and MW-3 in Parcel I and MW-1, MW-7, and MW-8 in Parcel II to assess the concentration and species of dehalococcoides (DHC) bacteria, if present. 3. Soil samples will be collected from three soil borings (SB38 through SB40) west of SB06c and along the western edge of Parcel I to further define CVOC concentrations in soil near SB06c. 4. Soil samples will be collected from one soil boring (SB34) located between SB17 and SB18 in Parcel II, to provide better spatial resolution of CVOCs in soil within Geophysical Anomaly I. All field tasks will be performed in accordance with AECOM Standard Operating Procedures (SOPs) and applicable state and federal guidance including, but not limited to, U.S. Environmental Protection Agency (EPA) SOPs for groundwater sampling (EPA, March 2013) and packaging, marking, labeling, and shipping of environmental samples (EPA, April 2011). The Health and Safety Plan (HASP) that was developed for this site for the 2014 ESA field activities will be updated as needed to include appropriate Task Hazard Analyses (THAs) associated with the work described herein. The HASP is an internal document to be utilized by AECOM field staff and AECOM subcontractors; however, a copy of the HASP can be provided upon request. Work on this project will be performed under the direction of a Professional Geologist licensed in the State of North Carolina. Data generated during this investigation and data generated in accordance with the Revised Addendum to the 2014 Environmental Site Assessment Work Plan, Rev 01 (AECOM, February 19, 2016) will be evaluated, and if data gaps are present, follow-on investigation activities will be recommended in an ESA Report Addendum. MOBILIZATION AND SITE PREPARATION Mobilization, utility locating, site preparation, and surveying activities will be conducted in accordance with the 2014 ESA Work Plan (AECOM, January 10, 2014) FIELD INVESTIGATION OVERVIEW Soil and groundwater samples will be collected as part of this investigation. Proposed sample locations are provided in Figure 2 for Parcel I and in Figure 3 for Parcel II. Sample collection procedures and methodologies are provided below for the media to be sampled:  Soil Sampling: Geoprobe® utilizing Direct Push Technology (DPT) will be used to acquire environmental samples. The rig and drilling crew will work under the direction of AECOM professional staff. One discrete soil sample will be collected from up to three depth intervals at each proposed soil boring: shallow (0-2 feet [ft]) below ground surface [bgs]), intermediate (2-10 ft bgs), and deep (i.e., at the top of competent rock; greater than 10 ft bgs). If the overburden soils are less than 5 ft thick, only two soil sample intervals (shallow and intermediate) will be collected. Drilling, field classification, lithologic characterization, screening for volatile vapors, equipment decontamination, and investigation derived waste (IDW) management will be conducted in accordance with the 2014 ESA Work Plan (AECOM, January 10, 2014). Mr. Stuart Rixman February 19, 2016 Page 3  Groundwater Sampling: Groundwater sampling will be conducted in accordance with the 2014 ESA Work Plan (AECOM, January 10, 2014). ANALYTICAL OVERVIEW Samples for soil and groundwater water will be analyzed for contaminants of potential concern (COPCs) (the following CVOCs: 1,1,1-trichloroethane [TCA], 1,1-dichloroethene [DCE], 1,2- dichloroethane [DCA], tetrachloroethylene [PCE], trichloroethylene [TCE], cis-1,2-DCE, and vinyl chloride [VC]) identified in the 2014 ESA Report (AECOM, May 28, 2014). Soil and groundwater samples will be analyzed by EPA SW-846 Method 8260B. Microbial groundwater samples will be analyzed using RT-qPCR (reverse transcript quantitative polymerase chain reaction) and qPCR. Table 1 and Table 2 summarize the sampling and analysis programs for soil and groundwater investigations, respectively. Pace Analytical® Services located in Huntersville, North Carolina will provide analytical testing services for the soil and water samples collected during this project. Microbial Insights located in Knoxville, Tennessee will provide analytical testing services for microbial samples collected during this event. VOLUNTARY ACTIONS (RESPONSIBLE PARTY-DRIVEN) INVESTIGATION ACTIVITIES Sampling of Existing Monitoring Well Network (Parcels I and II) Groundwater samples will be collected from the 2014 ESA monitoring well network to acquire current groundwater concentrations of CVOCs. This network is comprised of eleven existing overburden monitoring wells (MW-1, MW-2, MW-3, MW-4, MW-5, MW-6, MW-7, MW-8, MW-9, MW-10, and MW-11) and eight existing bedrock aquifer monitoring wells (P-1, P-2, P-3, P-4, P-5, P-6, W-2A, and W-3A). Microbial Study (Parcels I and II) Microbial samples will be collected from overburden monitoring wells with elevated CVOC concentrations, to determine if bacterial enzymes (DHC species) capable of degrading chlorinated ethenes under anaerobic conditions via co-metabolism are active (based on the presence of RNA) and their concentrations. Samples will be collected from monitoring wells MW-2 and MW-3 in Parcel I and MW-1, MW-7, and MW-8 in Parcel II, using a Microbial Insights Bio-Trap® Sampler or other passive adsorbent sampler. Each sampler will be deployed after the monitoring wells have been sampled for CVOCs. Each sampler will be placed into the saturated screen zone of each well and allowed to incubate for 30 to 60 days before retrieval. Soil Sampling near SB06a at Parcel I Soil samples will be acquired from three boreholes (SB38 through SB40) to be advanced along the western edge of Parcel I to further define the extent of CVOCs in soil in the vicinity of SB06c. As reported in the 2014 ESA Report (AECOM, May 28, 2014), PCE was detected at an elevated concentration from 0-2 ft bgs at SB06c. Three soil boreholes (SB38 through SB40) are proposed to the northwest, west, and southwest of SB06c, respectively, along the eastern edge of Crawford Avenue. FIGURES TABLES Table 1 Soil Sampling and Analysis Summary Former Scott Aviation Facility Monroe, North Carolina Sample Identification Depth Interval VOCs1 (8260B) Parcel I – Soil Sampling near SB06a SB38-S (XX) Shallow X SB38-I (XX) Intermediate X SB38D (XX) Deep X SB39-S (XX) Shallow X SB39-I (XX) Intermediate X SB39-D (XX) Deep X SB40-S (XX) Shallow X SB40-I (XX) Intermediate X SB40-D (XX) Deep X SB34-S (XX) Shallow X SB34-I (XX) Intermediate X SB34-D (XX) Deep X Notes: -a - Indicates a field duplicate sample -d - Indicates a equipment rinsate sample -ms/msd - Indicates a matrix spike/matrix spike duplicate sample VOC - Volatile Organic Compound 1 - 1,1,1-TCA; 1,1-DCE; 1,2-DCA; PCE; TCE; cis-1,2-DCE; VC Parcel II – Soil Sampling between SB17 and SB18 Page 1 of 1 February 2016 Table 2 Groundwater Sampling and Analysis Summary Former Scott Aviation Facility Monroe, North Carolina Sample Identification Depth Interval VOCs 1 (8260B) Microbial Sampler (RT-qPCR and qPCR) Existing Overburden Wells MW-1 Shallow X X MW-2 Shallow X X MW-3 Shallow X X MW-3-a Shallow X -- MW-3-d Shallow X -- MW-3-ms/msd Shallow X -- MW-4 Shallow X -- MW-5 Shallow X -- MW-6 Shallow X -- MW-7 Shallow X X MW-7-a Shallow X -- MW-8 Shallow X X MW-9 Shallow X -- MW-10 Shallow X -- MW-11 Shallow X -- P-1 Shallow X -- P-2 Shallow X -- P-3 Shallow X -- P-4 Shallow X -- P-5 Shallow X -- P-6 Deep X -- W-2A -- X -- W-3A -- X -- Notes: -a - Indicates a field duplicate sample -d - Indicates a equipment rinsate sample -ms/msd - Indicates a matrix spike/matrix spike duplicate sample VOC - Volatile Organic Compound 1 - 1,1,1-TCA; 1,1-DCE; 1,2-DCA; PCE; TCE; cis-1,2-DCE; VC -- = not applicable/unknown Existing Bedrock Wells Page 1 of 1 February 2016