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Home My WebLink AboutWS-5671_20030_CA_MRP_20190314 ExxonMobil Environmental and Property Solutions Company ANNUAL GROUNDWATER MONITORING AND SAMPLING REPORT – 2018 Former ExxonMobil Facility #99-GRE 101 N. Spring Street Greensboro, Guilford County, North Carolina Groundwater Incident #20030 March 2019 Annual Groundwater Monitoring and Sampling Report – 2018 arcadis.com i CONTENTS Executive Summary ....................................................................................................................................... 3 1 Introduction ............................................................................................................................................. 6 2 Free Product ........................................................................................................................................... 7 3 Groundwater Monitoring ......................................................................................................................... 8 3.1 Groundwater Gauging .................................................................................................................... 8 3.2 Groundwater Sampling ................................................................................................................... 8 3.3 Groundwater Analytical Results ...................................................................................................... 9 4 Site Remediation ................................................................................................................................... 11 4.1 Calcium Peroxide Injection ........................................................................................................... 11 4.2 Remediation Events to Date ......................................................................................................... 11 5 Conclusions and Recommendations .................................................................................................... 13 TABLES Table 1. Groundwater Elevation Data Table 2. Dissolved-Phase VOC Concentrations In Groundwater FIGURES Figure 1. Site Location Map Figure 2. Site Map Figure 3. Potentiometric Surface Map - December 14, 2018 Figure 4. Dissolved-Phase COC Concentrations in Groundwater Figure 5. Benzene Isoconcentration Map - December 14, 2018 Figure 6. Toluene Isoconcentration Map - December 14, 2018 Figure 7. Ethylbenzene Isoconcentration Map - December 14, 2018 Figure 8. Total Xylenes Isoconcentration Map - December 14, 2018 Figure 9. 1,2,4-Trimethylbenzene Isoconcentration Map - December 14, 2018 Figure 10. Chemical Injection Layout Annual Groundwater Monitoring and Sampling Report – 2018 arcadis.com ii APPENDICES A - Groundwater Laboratory Analytical Report and Chain-of-Custody - December 5, 2018 B - Notice of Intent to Construct or Operate Injection Wells – May 21, 2018 C - Injection Event Record - November 15, 2018 D - Calcium Peroxide Injection Summary - October 2018 E - Field Parameters Annual Groundwater Monitoring and Sampling Report – 2018 arcadis.com EXECUTIVE SUMMARY On behalf of ExxonMobil Environmental and Property Solutions Company (E&PS)1, Arcadis G&M of North Carolina, Inc. (Arcadis) completed an annual liquid level monitoring and groundwater sampling event for 2018 at the former ExxonMobil Facility #99-GRE located at 101 N. Spring Street (Formerly addressed at 615 West Friendly Avenue) in Greensboro, Guilford County, North Carolina (the Site). The objective of the groundwater monitoring and sampling program is to evaluate concentrations of dissolved-phase chemicals of concern (COCs) and maintain compliance with the North Carolina Department of Environmental Quality (NCDEQ) Underground Storage Tank (UST) Program requirements for the site. On October 22-30, 2018, Arcadis subcontracted Remington Technologies, LLC (Remington) to complete a calcium peroxide injection at the Site. Injections were completed within the proposed injection zone, as outlined in the Notification of Intent (NOI) to Construct or Operate Injection Wells Form submitted to the NCDEQ Division of Water Resources (DWR), Underground Injection Control (UIC) Program on May 21, 2018. The NCDEQ DWR approved the NOI application and issued a deemed permit number WI0400492 for injection activities on June 1, 2018. Approximately 2,100 gallons of IXPER 75C Calcium Peroxide slurry was injected into thirteen (13) temporary injection points. The location and interval of injection points were adjusted due to an existing underground utility identified within the injection zone, during utility locate activities at the Site. Arcadis submitted an Injection Event Record detailing the October 22-30, 2018 calcium peroxide injection event on November 15, 2018. On December 14, 2018, Arcadis completed a post-injection groundwater monitoring and sampling event in conjunction with the annual liquid level monitoring and groundwater sampling event for 2018 to evaluate the current groundwater conditions and to maintain compliance with the UIC Program requirements. During the 2018 annual sampling event, eight (8) groundwater monitoring wells, MW-1R, MW-4, MW-6, MW-7, MW-8, MW-9, MW-10, and DW-1 were gauged to determine depth to water (DTW). Depths to water ranged from 5.95 feet below top of well casing (btoc) in groundwater monitoring well MW-10 to 15.00 feet btoc in groundwater monitoring well MW-8. Monitoring well MW-7 was buried under snow and was not accessible during gauging activities. Groundwater flow was observed to be towards the west which is consistent with the historical groundwater flow direction observed at the site. Free product was not detected in any of the groundwater monitoring wells. Groundwater samples were collected on December 14, 2018 from five groundwater monitoring wells (MW-1R, MW-4, MW-6, MW-9, and MW-10). The maximum concentrations of selected dissolved-phase COCs found during the sampling event are summarized in the table below: 1 Please note ExxonMobil Environmental Services (EMES) has changed their name to ExxonMobil Environmental and Property Solutions Company (E&PS). Annual Groundwater Monitoring and Sampling Report – 2018 arcadis.com Maximum Groundwater Concentrations (December 14, 2018) Chemical of Concern (COC) Well ID Concentration (µg/L) 2B Surface Water Standard (µg/L) GCL Standard (µg/L) Benzene MW-9 11,000 51 5,000 Toluene MW-9 16,000 11 260,000 Ethylbenzene MW-1R 1,500 97 84,500 Xylenes (total) MW-9 9,300 670 85,500 1,2-Dichloropropane All Non-Detect 15 600 1,2,4-Trimethylbenzene MW-9 970 390 28,500 1,3,5-Trimethylbenzene MW-1R 590 630 25,500 Ethylene dibromide All Non-Detect 0.31 50 Notes: GCL = Gross Contaminant Level Concentrations in Bold exceed the applicable NC 2B Surface Water Standard. Concentrations in Shading exceed the applicable GCL. µg/L = micrograms per liter Dissolved-phase concentrations of benzene, toluene, ethylbenzene, total xylenes, and 1,2,4- trimethylbenzene were detected in concentrations exceeding the applicable North Carolina NCAC 15A 2B Surface Water Standards in groundwater samples collected on December 14, 2018. Additionally, dissolved-phase concentrations of benzene were detected in concentrations exceeding the applicable North Carolina Gross Contamination Levels (GCLs) for Groundwater in groundwater monitoring wells MW- 1R and MW-9. The lateral and vertical extent of the dissolved-phase plume at the Site has been adequately delineated by the existing monitoring well network at the Site. Based on current and historical analytical data, dissolved- phase impacts have not mobilized off-site, and have remained stable near the source area. Arcadis, therefore respectfully requests that dissolved-phase COC concentrations at the Site be compared to the North Carolina Gross Contaminant Level (GCL) Standards. As recommended in the NOI application (Deemed Permit # WI0400492), groundwater monitoring and sampling will continue on a quarterly basis for a year, in order to evaluate the effectiveness of treatment. The next quarterly monitoring and sampling event is scheduled for March 2019. Arcadis will conduct the next annual groundwater monitoring and sampling event in November 2019 which will coincide with the final quarterly sampling event as proposed in the NOI application. During the March 2019 event all existing groundwater monitoring wells, MW-1R, MW-4, MW-6, MW-7, MW-8, MW-9, MW-10, and DW-1 will be gauged to determine the potentiometric surface at the site and to check for the presence of free product. Field parameters (pH, dissolved oxygen, redox potential, specific conductance) will be collected to asses groundwater conditions and injection delivery. Groundwater samples will be collected from existing groundwater monitoring wells MW-1R, MW-4, MW-6, and MW-9 for the analysis of Volatile Organic Compounds (VOCs) by Standard Method (SM) 6200B. Pending approval from the NCDEQ, dissolved-phase COC concentrations will be compared to the North Carolina GCL Standards. A Semi- Annual Corrective Action Plan Monitoring Report, summarizing results quarterly sampling completed in Annual Groundwater Monitoring and Sampling Report – 2018 arcadis.com December 2018 and March 2019, will be submitted to the NCDEQ UST Section for review and approval within 45 days of receipt of the fourth quarter laboratory analytical report. Annual Groundwater Monitoring and Sampling Report – 2018 arcadis.com 1 INTRODUCTION Former ExxonMobil (Exxon) facility #99-GRE, located at 101 N. Spring Street (Formerly addressed at 615 West Friendly Avenue), Greensboro, Guilford County, North Carolina operated as a service station from the 1940s until the mid-1970s. Records indicate that a 2,000-gallon used oil UST, an 8,000-gallon UST, and two 12,000-gallon gasoline USTs were removed from the site, but two 2,000-gallon diesel USTs may still remain at the site. Site characterization activities were initiated in September 1998 and confirmed subsurface petroleum impact. During property redevelopment activities, three of the six monitoring wells were destroyed or abandoned. Three of the original monitoring wells (MW-1R, MW-4 and DW-1) currently remain at the site. Three separate retail petroleum facilities occupied portions of the property. The subject incident number is situated at the southeast corner property at the intersection of North Spring Street and West Market Street. A site location map is provided as Figure 1, and site map is included as Figure 2. The site is currently a Carolina Bank branch office owned and operated by BACH LLC. The land use surrounding the site is commercial/industrial. Drinking water is supplied by the City of Greensboro. Public or private potable water wells have not been identified within 1,000 feet of the site. An unnamed tributary to North Buffalo Creek is located approximately 160 feet west of the site. The site is located within the Carolina Slate Belt (early Paleozoic metavolcanics, metasediments and igneous intrusion) within the Piedmont physiographic province of North Carolina. Specifically, the site is underlain by late Proterozoic to late Cambrian metamorphosed igneous rock. Saprolite, a layer of weathered and variably decomposed bedrock, commonly mantles bedrock in this region. Saprolite has the appearance of compact clay to sandy soil, with original bedrock textures and features preserved. Soils at the site consist primarily of clay and silt. Depth to groundwater at the site ranges from 9 to 17 feet below ground surface (bgs). The NCDEQ Risk Classification for the site is “Intermediate” due to the presence of surface water within 500 feet. Therefore, COC concentrations in groundwater are currently compared to the North Carolina 15A NCAC 2B surface water standards. Annual Groundwater Monitoring and Sampling Report – 2018 arcadis.com 2 FREE PRODUCT Groundwater gauging activities conducted during injection activities on October 22-30, 2018 and December 14, 2018 indicated that free product was not present in any of the groundwater monitoring wells. Free product has not been historically observed at the site. Current and historical groundwater elevations are summarized in Table 1. Annual Groundwater Monitoring and Sampling Report – 2018 arcadis.com 3 GROUNDWATER MONITORING 3.1 Groundwater Gauging On December 14, 2018, Arcadis personnel gauged groundwater monitoring wells MW-1R, MW-4, MW-6, MW-8, MW-9, MW-10, and DW-1. During the December 14, 2018 gauging event, monitoring well MW-7 was buried under snow and was not accessible during gauging activities. Gauging was conducted with an oil/water interface probe (IP) prior to purging and sampling to determine depth to water (DTW), and depth to product (DTP), if present. The IP and attached tape, marked in 0.01-foot increments, were properly decontaminated before each use with Alconox soap and rinsed with distilled water. The DTW was measured from the marked survey point on the top of well casing (TOC). All measurements were recorded to the nearest 0.01-foot increment. Depths to water ranged from 5.95 feet below top of well casing (btoc) in groundwater monitoring well MW- 10 to 15.00 feet btoc in groundwater monitoring well MW-8. Groundwater flow was observed to be towards the west which is consistent with the historical groundwater flow direction observed at the site. Free product was not detected in any of the groundwater monitoring wells during the December 14, 2018 groundwater gauging event. Current and historical groundwater elevations are summarized in Table 1. A potentiometric surface map for the December 14, 2018 groundwater gauging event is provided as Figure 3. 3.2 Groundwater Sampling On December 14, 2018, groundwater monitoring wells MW-1R, MW-4, MW-6, MW-9, and MW-10 were purged of stagnant water. Prior to purging, the amount of water to be removed was calculated using the following formula: 3.1415 x r2 x (TD – DTW) x 7.481 = gallons of water (1 well volume) Where: r = radius of well (in feet) TD = total depth of well (in feet) DTW = depth to water (in feet) In order to ensure that the water in each groundwater monitoring well after purging was representative of the water in the aquifer, a minimum of three well volumes were removed. If the groundwater monitoring well did not generate three well volumes of water, it was bailed dry and then given sufficient time to allow for recharging. All sampling tasks were completed within 24 hours of purging. Groundwater samples were obtained from each groundwater monitoring well using disposable polyethylene bailers and new nylon rope. Groundwater samples collected from the groundwater monitoring well were placed in laboratory-supplied containers and shipped on wet ice to Eurofins Laboratories Lancaster Environmental, in Lancaster, Pennsylvania, for analysis of volatile organic compounds (VOCs) by Standard Method (SM) 6200B. Groundwater samples submitted for VOC analysis were collected in triplicate 40-milliliter volatile organic analysis (VOA) glass vials with Teflon-lined septa Annual Groundwater Monitoring and Sampling Report – 2018 arcadis.com screw caps preserved with hydrochloric acid (HCl). Laboratory analytical results and chain-of-custody documentation are included as Appendix A. 3.3 Groundwater Analytical Results Analytical data from the December 14, 2018 groundwater sampling event indicated the following: • Dissolved phase concentrations of benzene were detected above the NCAC 15A 2B Surface Water standard (51 µg/L) in groundwater monitoring wells MW-1R at 8,400 µg/L, MW-4 at 440 µg/L, and MW-9 at 11,000 µg/L. The benzene concentrations detected in groundwater monitoring wells MW-1R and MW-9 exceeded the North Carolina Gross Contamination Levels (GCLs) Standard of 5,000 µg/L. • Dissolved phase concentrations of toluene were detected above the NCAC 15A 2B Surface Water standard (11 µg/L) in groundwater monitoring wells MW-1R at 9,600 µg/L, and MW-9 at 16,000 µg/L. • Dissolved phase concentrations of ethylbenzene were detected above the NCAC 15A 2B Surface Water standard (97 µg/L) in groundwater monitoring wells MW-1R at 1,500 µg/L, MW-4 at 220 µg/L, and MW-9 at 1,000 µg/L. • Dissolved phase concentrations of total xylenes were detected above the NCAC 15A 2B Surface Water standard (670 µg/L) in groundwater monitoring wells MW-1R at 8,300 µg/L and MW-9 at 9,300 µg/L. • Dissolved phase concentrations of 1,2,4-trimethylbenzene were detected above the NCAC 15A 2B Surface Water standard (390 µg/L) in groundwater monitoring wells MW-1R at 930 µg/L and MW-9 at 970 µg/L. Current and historical groundwater analytical results are presented in Table 2. A groundwater analytical map is presented as Figure 4. Isoconcentration maps depicting the extent of the dissolved-phase COCs are presented as Figure 5 through Figure 9. The maximum dissolved-phase concentrations of COCs that were detected in concentrations exceeding the applicable North Carolina 15A NCAC 2B surface water standards and the monitoring wells in which they were detected are listed below: Annual Groundwater Monitoring and Sampling Report – 2018 arcadis.com Maximum Groundwater Concentrations (December 14, 2018) Chemical of Concern (COC) Well ID Concentration (µg/L) 2B Surface Water Standard (µg/L) GCL Standard (µg/L) Benzene MW-9 11,000 51 5,000 Toluene MW-9 16,000 11 260,000 Ethylbenzene MW-1R 1,500 97 84,500 Xylenes (total) MW-9 9,300 670 85,500 1,2-Dichloropropane All Non-Detect 15 600 1,2,4-Trimethylbenzene MW-9 970 390 28,500 1,3,5-Trimethylbenzene MW-1R 590 630 25,500 Ethylene dibromide All Non-Detect 0.31 50 Notes: GCL = Gross Contaminant Levels Concentrations in Bold exceed the applicable NC 2B Surface Water Standard. Concentrations in Shading exceed the applicable GCL. µg/L = micrograms per liter Annual Groundwater Monitoring and Sampling Report – 2018 arcadis.com 4 SITE REMEDIATION 4.1 Calcium Peroxide Injection On October 22-30, 2018, Arcadis oversaw the completion of a calcium peroxide injection event as outlined in the May 21, 2018 NOI to Construct or Operate Injection Wells application and was approved by the NCDEQ DWR-UIC Program and issued deemed permit number WI0400492 (Appendix B). The IXPER 75 C Calcium Peroxide (CaP) was supplied and delivered to the Site by Remington Technologies, Inc. A total of thirteen (13) of temporary injection points were completed using direct-push technology (DPT) to advance a 2.25-inch probe rod into the subsurface. A layout of the location of temporary injection points is included as Figure 10. Borehole clearance was performed using a hand auger to approximately 8-feet (ft) below ground surface (bgs). The location of injection points was adjusted to maintain at least 5-feet away from an underground utility line identified during utility locate activities (Figure 10). The CaP slurry was mixed onsite in PVC tanks with municipal water supplied by the City of Greensboro via a fire hydrant located on the Site property. PVC tanks were housed inside a box truck to limit exposure to air borne particles. Approximately 2,100-gallons of calcium peroxide mixture (25% by volume) was injected between groundwater monitoring well MW-1R and MW-9. Arcadis has submitted the Injection Event Record detailing the October 22-30, 2018 CaP injection event on November 15, 2018 and is included as Appendix C. An injection event summary is also provided in Appendix D. Additionally, field parameter measurements were collected for pH, dissolved oxygen, redox potential, specific conductance before and during injection activities to asses groundwater conditions during injection activities. Data was collected from monitoring wells MW-1R and MW-9. A summary of field parameters is included as Appendix E. 4.2 Remediation Events to Date Summarized in the table below is a chronology of remediation activities performed at the site to date: Remediation Activities to Date Activity 2004 - 2010 Monitored Natural Attenuation February 2, 2010 8-Hour Aggressive Fluid Vapor Recovery (AFVR) on MW-1R and MW-4 – 388 gallons petroleum-water and 4.34 pounds TPH recovered. August 10, 2010 8-Hour AFVR on MW-1R and MW-4 – 574 gallons petroleum-water and 10.22 pounds TPH recovered. October 5, 2010 8-Hour AFVR on MW-1R and MW-4 – 997 gallons petroleum-water and 18.90 pounds TPH recovered. November 10, 2010 8-Hour AFVR on MW-1R and MW-4 – 866 gallons petroleum-water and 14.16 pounds TPH recovered. Annual Groundwater Monitoring and Sampling Report – 2018 arcadis.com May 23, 2011 8-Hour AFVR on MW-1R and MW-4 – 1,053 gallons petroleum-water and 5.64 pounds TPH recovered. 2011 – October 2018 Monitored Natural Attenuation October 22-30, 2018 Calcium peroxide injection. Approximately 2,100 - gallons of slurry injected into thirteen (13) temporary injection points. Annual Groundwater Monitoring and Sampling Report – 2018 arcadis.com 5 CONCLUSIONS AND RECOMMENDATIONS Free product was not detected during injection activities between October 22-30, 2018, and the December 14, 2018 groundwater monitoring event. Dissolved-phase concentrations of benzene, toluene, ethylbenzene, total xylenes, and 1,2,4-trimethylbenzene were detected in in concentrations that exceeded the applicable North Carolina NCAC 15A 2B surface water standards at the site in December 2018. Additionally, dissolved-phase concentrations of benzene were detected in concentrations exceeding the applicable North Carolina GCL standard in groundwater monitoring wells MW-1R and MW-9. The lateral and vertical extent of the dissolved-phase plume at the Site has been adequately delineated by the existing monitoring well network at the Site. Based on current and historical analytical data, dissolved- phase impacts have not mobilized off-site, and have remained stable near the source area. Arcadis, therefore respectfully requests that dissolved-phase COC concentrations at the Site be compared to the North Carolina Gross Contaminant Level (GCL) Standards. As recommended in the NOI application (Deemed Permit # WI0400492), groundwater monitoring and sampling will continue on a quarterly basis for a year, in order to evaluate the effectiveness of treatment. The next quarterly monitoring and sampling event is scheduled for March 2019. During the March 2019 event all existing groundwater monitoring wells, MW-1R, MW-4, MW-6, MW-7, MW-8, MW-9, MW-10, and DW-1 will be gauged to determine the potentiometric surface at the site and to check for the presence of free product. Field parameters (pH, dissolved oxygen, redox potential, specific conductance) will be collected to asses groundwater conditions and injection delivery. Groundwater samples will be collected from existing groundwater monitoring wells MW-1R, MW-4, MW-6, and MW-9 for the analysis of Volatile Organic Compounds (VOCs) by Standard Method (SM) 6200B. Pending approval from the NCDEQ, dissolved-phase COC concentrations will be compared to the North Carolina GCL Standards. A Semi- Annual Corrective Action Plan Monitoring Report, summarizing results from the first and second quarter sampling, will be submitted to the NCDEQ UST Section for review and approval within 45 days of receipt of the fourth quarter laboratory analytical report. TABLES Table 1: Groundwater Elevation Data Revision Date: 1/31/2019 Groundwater Incident Number: 20030 Facility ID #: Former ExxonMobil Facility #99-GRE Monitor Well I.D. Date Installed Date Water Level Measured Well Casing Diameter (inches) Well Casing Depth (feet bgs) Screened Interval (feet bgs) Bottom of Well (feet bgs) Relative Top of Casing Elevation (feet) Depth to Water from Top of Casing (feet) Free Product Thickness (feet) Relative Groundwater Elevation (feet) 5/15/2002 1 0-15 15-30 30 100.14 15.42 0.00 84.72 1/12/2004 1/13/2004 12.80 0.00 87.20 10/3/2006 13.65 0.00 86.35 10/25/2007 17.00 0.00 83.00 10/13/2008 11.63 0.00 88.37 8/12/2009 12.63 0.00 87.37 2/4/2010 12.54 0.00 87.46 8/9/2010 13.19 0.00 86.81 8/10/2010 13.23 0.00 86.77 11/22/2010 13.35 0.00 86.65 2/26/2011 15.00 0.00 85.00 4/22/2011 14.45 0.00 85.55 5/23/2011 14.27 0.00 85.73 10/25/2011 14.32 0.00 85.68 3/15/2012 14.46 0.00 85.54 8/14/2012 14.91 0.00 784.89 3/14/2013 14.51 0.00 785.29 9/20/2013 13.32 0.00 786.48 3/25/2014 13.22 0.00 786.58 9/24/2014 14.18 0.00 785.62 3/18/2015 14.38 0.00 785.42 9/10/2015 14.35 0.00 785.45 8/11/2016 12.97 0.00 786.83 9/15/2017 14.16 0.00 785.64 12/14/2018 11.92 0.00 787.88 5/15/2002 9.75 0.00 83.45 1/13/2004 8.40 0.00 84.80 5/15/2002 14.11 0.00 81.25 1/13/2004 12.20 0.00 83.16 10/16/2003 9.55 0.00 87.421/13/2004 10.55 0.00 86.42 1/2/2006 12.10 0.00 84.87 10/3/2006 11.58 0.00 85.39 10/25/2007 15.37 0.00 81.60 10/13/2008 11.78 0.00 85.19 8/12/2009 11.00 0.00 85.97 2/4/2010 14.63 0.00 82.34 8/9/2010 12.38 0.00 84.59 8/10/2010 13.23 0.00 83.74 11/22/2010 13.44 0.00 83.53 2/26/2011 13.90 0.00 83.07 4/22/2011 13.60 0.00 83.37 5/23/2011 13.40 0.00 83.57 10/25/2011 13.56 0.00 83.41 3/15/2012 13.59 0.00 83.38 8/14/2012 13.15 0.00 785.34 3/14/2013 13.72 0.00 784.77 9/20/2013 12.57 0.00 785.92 3/25/2014 12.42 0.00 786.07 9/24/2014 13.38 0.00 785.11 3/18/2015 13.57 0.00 784.92 9/10/2015 13.36 0.00 785.13 8/11/2016 12.35 0.00 786.14 9/15/2017 13.46 0.00 785.0312/14/2018 11.91 0.00 786.58 10/16/2003 9.11 0.00 89.92 1/13/2004 12.30 0.00 86.73 10/25/2007 8/14/2012 12.45 0.00 784.38 3/14/2013 12.88 0.00 783.95 9/20/2013 12.13 0.00 784.70 3/25/2014 12.21 0.00 784.62 9/24/2014 12.70 0.00 784.13 3/18/2015 12.97 0.00 783.86 9/10/2015 13.09 0.00 783.74 8/11/2016 11.96 0.00 784.87 9/15/2017 12.78 0.00 784.05 12/14/2018 11.39 0.00 785.44 MW-6 8/5/12 0-7 7-22 796.83 798.49 0-7 1 2 0-10 10-20 20 7-22 22 2 MW-1R 10/15/03 4 Abandoned 0-4 4-14 Destroyed 799.80 MW-4 10/15/03 95.36 200-5 4 0-7 7-22 22 Destroyed 93.20MW-2 5/13/02 96.97 1 MW-3 5/13/02 14 5-20 MW-1 5/13/02 Abandoned 22 100.00 99.03MW-5 10/15/03 Page 1 of 2 Table 1: Groundwater Elevation Data Revision Date: 1/31/2019 Groundwater Incident Number: 20030 Facility ID #: Former ExxonMobil Facility #99-GRE Monitor Well I.D. Date Installed Date Water Level Measured Well Casing Diameter (inches) Well Casing Depth (feet bgs) Screened Interval (feet bgs) Bottom of Well (feet bgs) Relative Top of Casing Elevation (feet) Depth to Water from Top of Casing (feet) Free Product Thickness (feet) Relative Groundwater Elevation (feet) 8/14/2012 16.99 0.00 783.08 3/14/2013 17.66 0.00 782.41 9/20/2013 17.15 0.00 782.92 3/25/2014 16.62 0.00 783.45 9/24/2014 17.15 0.00 782.92 3/18/2015 17.54 0.00 782.53 9/10/2015 17.81 0.00 782.26 8/11/2016 16.73 0.00 783.34 9/15/2017 17.67 0.00 782.40 12/14/2018 NG ---- 8/14/2012 16.35 0.00 785.60 3/14/2013 16.79 0.00 785.16 9/20/2013 15.56 0.00 786.39 3/25/2014 15.57 0.00 786.38 9/24/2014 16.41 0.00 785.54 3/18/2015 16.60 0.00 785.35 9/10/2015 16.76 0.00 785.19 8/11/2016 15.41 0.00 786.54 9/15/2017 16.60 0.00 785.35 12/14/2018 15.00 0.00 786.95 3/25/2014 12.04 0.00 NS 9/24/2014 12.98 0.00 NS 3/18/2015 13.17 0.00 NS 9/10/2015 13.14 0.00 NS 8/11/2016 11.75 0.00 NS 9/15/2017 12.95 0.00 NS 12/14/2018 11.42 0.00 NS 8/11/2016 5.80 0.00 NS 9/15/2017 6.75 0.00 NS 12/14/2018 5.95 0.00 NS 10/16/2003 11.05 0.00 85.98 1/13/2004 9.90 0.00 87.13 1/2/2006 12.15 0.00 84.88 10/3/2006 14.40 0.00 82.63 10/25/2007 15.67 0.00 81.36 10/13/2008 11.57 0.00 85.46 8/12/2009 10.91 0.00 86.12 8/9/2010 12.35 0.00 84.68 11/22/2010 14.15 0.00 82.88 2/26/2011 14.02 0.00 83.01 4/22/2011 13.50 0.00 83.53 5/23/2011 13.26 0.00 83.77 10/25/2011 13.22 0.00 83.81 3/15/2012 13.14 0.00 83.89 8/14/2012 13.75 0.00 784.743/14/2013 13.58 0.00 784.91 9/20/2013 12.46 0.00 786.03 3/25//14 12.35 0.00 786.14 9/24/2014 13.32 0.00 785.17 3/18/2015 13.35 0.00 785.14 9/10/2015 13.18 0.00 785.31 8/11/2016 12.62 0.00 785.87 9/15/2017 13.44 0.00 785.05 12/14/2018 11.77 0.00 786.72 Notes: bgs = below ground surface *Monitoring well casing elevations surveyed by Arcadis G&M of North Carolina, Inc. on August 8, 2013 38-43 43 798.49 801.95 MW-9 3/9/14 2 0-10 10-20 12 20 NS MW-8 8/5/12 2 0-10 10-20 20 MW-7 8/5/12 2 0-10 10-20 20 800.07 DW-1 10/16/03 2 NG = Not Gauged NS = Not Surveyed NS -- = Not Available MW-10 7/15/16 2 0-2 2-12 97.03 0-38 Page 2 of 2 Table 2: Dissolved-Phase VOC Concentrations in GroundwaterRevision Date: 12/27/2018Incident Number: 20003Facility ID #: Former ExxonMobil Facility #99-GREWell or SW IDDate Collected (mm/dd/yr) Sample IDIncident Phase1,400 NE NE 51 11 97 670 1,500 320 13,000 37 15 NE 330 3,200 390 630 0.31 25 0.31NE NE NE 5,000 260,000 84,500 85,500 20,000 25,000 70,000 400 600 6,900 6,000 30,000 28,500 25,000 50 15,000 50MW-1 5/15/2002 MW-1 Monitoring28,000 8,500 ND9,700 12,000 1,500 7,500ND -- 93078-- -- 92 -- -- --357.62 '--10/16/2003 Monitoring109,000 17,900 4,79029,800 20,600 1,980 10,100680 -- 1,060 <250 -- -- 91.0 -- -- --16824.0 --1/2/2006Monitoring90,800 16.1 5.1922,400 17,200 1,810 11,430 1,900-- 1,600 ND ND -- -- -- -- -- -- 0.033 --10/3/2006Monitoring27,100 ND 361021,700 20,800 1,920 15,000ND -- 518 ND ND -- 188 -- -- -- --29.3 --10/25/2007Monitoring77,000 12300 443018,600 10,500 1,340 4,970ND -- 331 ND21.9-- 106 -- -- -- -- -- --10/13/2008Monitoring58,400 12900 44207,260 10,600 938 6,750ND -- 331 ND21.9--39.2------------8/12/2009Monitoring6,690 830 299310 80567.8 667 < 0.500 -- 4.95 < 0.500 < 0.500 -- 5.05 -- -- -- -- -- --8/9/2010 Monitoring-- -- --3,180 6,920 625 4,000< 0.500 24.1 51.5 < 0.500 < 0.500 14.1 50.2 43.4526230 -- -- --11/22/2010 Monitoring-- -- --5,520 10,500 1,230 8,620< 0.500 92.5 106 < 0.500 < 0.500 93 252 2062,210 884 48-- --2/26/2011 NUC0168-01Monitoring-- -- --14,900 18,900 1,980 9,670< 0.500 75.8 198 < 0.500 < 0.500 32.5 158 1301,44051770.1-- --4/22/2011 NUD3901-01Monitoring-- -- --10,600 11,900 1,570 8,3400.67 86.3 167 < 0.500 < 0.500 43.0 160 1651,620 644 59.4-- --10/25/2011 NUJ3226-02 Monitoring-- -- --17,500 21,200 1,600 7,740< 0.500 57.5 264 < 0.500 < 0.500 11.2 114 83.484730242.4--30.233/15/2012 Monitoring-- -- --15,000 11,100 1,370 6,340< 10.0 53.4 217 < 10.0 < 10.0 13.8 106 87.676328326.8--27.938/14/2012 Monitoring108,00021,200 2,74011,900 15,400 1,370 7,480< 0.500 59.7 186 < 0.50019.820.6 119 99.387432529.6--30.93/14/2013 Monitoring-- -- --4,950 8,940 1,120 6,200< 0.500 50.2 40.1 < 0.500 < 0.500 22.4 99.1 98.3843352 < 0.500 -- --9/20/2013 Monitoring -- -- --11,600 10,200 1,530 8,050<10.0 50.7 148 <10.0 <10.0 17.3 <100 10192035215.4-- --3/25/2014490-49450-1Monitoring -- -- --11,000 7,840 1,590 8,620<10.0 56.6 151 <10.0 <10.0 23.1 120 1071,060434 <10.0 -- --9/24/2014490-62265-1Monitoring -- -- --13,200 15,900 1,630 9,000<10.0 51.6 203 <10.0 13.9 16.6 104 96.5994389 <10.0 -- --3/18/2015490-74765-1Monitoring -- -- --10,700 11,700 1,700 9,180<10.0 53.1 141 <10.0 <10.0 <10.0 118 91.81,02043317.3-- --9/10/2015490-87114-1Monitoring -- -- --13,500 16,200 1,670 9,130<10.0 45.6 189 <10.0 12.6 21.3 <100 86.61,06042413.8-- --8/11/2016490-109742-1Monitoring -- -- --13,300 9,010 1,830 11,000<10.0 59.1 162 <10.0 <10.0 23.6 125 109.01,110463<10.0-- --9/15/20179213047Monitoring -- -- --14,000 5,100 1,800 9,100<100 <100 190 <100 <100 <100 110 <100990360 <100 -- --12/14/20189943002Monitoring -- -- --8,400 9,600 1,500 8,300<50 61 120 <50 <50 <50 120 100930590 <50 -- --MW-2 5/15/2002 MW-2 Monitoring570 ND ND ND ND ND ND ND -- 1,40093-- -- ND -- -- -- ND ND --MW-3 5/15/2002 MW-3 MonitoringND ND ND ND ND ND ND ND -- ND ND -- -- ND ---- --ND ND --10/16/2003Monitoring10,0001,620 1,0001,140 135 299479 32.0 -- 1,360 <0.5 -- -- 40.0 -- -- -- <0.02 <5 --1/2/2006Monitoring1.16 0.25 0.1651,310 47.3 403297.7 84.4 -- 17.8 ND 2.09 -- -- -- -- -- -- ND --10/3/2006Monitoring6,890ND 5181,080 136 337288 ND -- 1,910 ND ND -- 60.2 -- -- -- -- ND --10/25/2007Monitoring4,900847 ND62710.2 96.5 42.8 ND -- 1,200 ND ND -- 31.1 -- -- -- -- -- --10/13/2008Monitoring7,6001,110 7711,210 19.8 357253 2.76 -- 981 ND ND -- 85.4 -- -- -- -- -- --8/12/2009Monitoring25,9002,940 <2,0002,250 40.7 457298 < 0.500 -- 981 < 0.500 < 0.500 -- 98.9 -- -- -- -- -- --8/9/2010 Monitoring-- -- --8,590 97.1 4,580 1,800< 0.500 105 730 < 0.500 < 0.500 36.2 499 2631,040147 -- -- --11/22/2010 Monitoring-- -- --3,070 155 192305 < 0.500 10.8 504 < 0.500 < 0.500 5.38 55.1 14.2 54 41.9 < 0.500 -- --2/26/2011 NUC0168-02Monitoring-- -- --5,200 80.3 1,220 763< 0.500 60.8 541 < 0.500 < 0.500 13.4 275 99.8 189 43.2 < 0.500 -- --4/22/2011 NUD3901-02Monitoring-- -- --4,870 87.6 527193 < 0.500 43.1 1,040 < 0.500 < 0.500 10.3 120 54 73.7 23.1 < 0.500 -- --10/25/2011 NUJ3226-01 Monitoring-- -- --4,560 63.6 477205 1.14 35.2 1,320 <0.500 < 0.500 6.71 138 45.1 78.4 14.6 < 0.500 -- < 0.020003/15/2012 Monitoring-- -- --4,390 75.8 399172 < 2.50 36.6 1,280 < 2.50 < 2.50 6.45 112 44.0 63.1 12.7 < 2.50 -- < 0.01958/14/2012 Monitoring29,2002,540 < 1,0004,130 75.2 560238 < 0.500 51.0 1,470 < 0.500 < 0.500 10.8 182 66.7 73.9 14.6 < 0.500 -- < 0.01993/14/2013 Monitoring-- -- --3,260 73.5 336114 <0.500 32.5 1,220 <0.500 <0.500 8.13 93.9 41.7 28.6 10.6 <0.500 -- --9/20/2013 Monitoring4,680 76.0 361101 <2.5 34.1 1,540 <2.5 <2.5 7.25 82.4 39.4 8.62 10.0 <2.50 -- --3/25/2014 490-49450-2 Monitoring-- -- --1,970 42.5 26573.7 <2.50 22.9 767 <2.50 <2.50 6.79 64.4 35.2 13.8 5.01 <2.50 -- --9/24/2014 490-62265-2 Monitoring-- -- --5,110 81.8 374106 <2.50 36.8 1,740 <2.50 <2.50 7.46 103 44.7 7.54 7.26 <2.50 -- --3/18/2015 490-74765-2 Monitoring-- -- --2,310 41.6 23968.5 <2.50 22.3 1,230 <2.50 <2.50 <2.50 66.8 28.9 6.71 4.33 <2.50 -- --9/10/2015 490-87114-2 Monitoring-- -- --4,070 59.5 378119 <2.50 33.3 1,660 <2.50 <2.50 6.47 81.4 43.9 10.5 5.98 <2.50 -- --8/11/2016 490-109742-2 Monitoring-- -- --4,140 57.2 532144 <2.50 38.8 1,460 <2.50 <2.50 11.8 141 72.3 13.1 5.87 <2.50 -- --9/15/2017 9213048 Monitoring-- -- --1,400 26.0 13048 <25 <25 1,100 <25 <25 <25 36 <25 <25 <25 <25 -- --12/14/2018 9943003 Monitoring-- -- --4409.722043 <5.0 15 310 <5.0 <5.0 <5.0 31 35 22 5.70 <5.0 -- --MW-1RMW-4MW-4MW-1RMW-1RMW-4BenzeneEthylbenzene3030CMTBEXylenes1,2-DichloroethaneDiisopropyl EtherContaminant of Concern →NC 2B Surface Water StandardsLeadEDB1,2,4-Trimethylbenzenen-ButylbenzeneAnalytical Methods →C9-C10 AliphaticsIsopropylbenzene1,3,5-Trimethylbenzenen-PropylbenzeneNaphthaleneToluene1,2-DichloropropaneC9-C12 Aliphatics(Uandjusted)Gross Contaminant Levels (GCL)504.1EDBMADEP VPH (historical data used VPH/EPH)C5-C8 Aliphatics(Unadjusted)Page 1 of 2 Table 2: Dissolved-Phase VOC Concentrations in GroundwaterRevision Date: 12/27/2018Incident Number: 20003Facility ID #: Former ExxonMobil Facility #99-GREWell or SW IDDate Collected (mm/dd/yr) Sample IDIncident Phase1,400 NE NE 51 11 97 670 1,500 320 13,000 37 15 NE 330 3,200 390 630 0.31 25 0.31NE NE NE 5,000 260,000 84,500 85,500 20,000 25,000 70,000 400 600 6,900 6,000 30,000 28,500 25,000 50 15,000 50BenzeneEthylbenzene3030CMTBEXylenes1,2-DichloroethaneDiisopropyl EtherContaminant of Concern →NC 2B Surface Water StandardsLeadEDB1,2,4-Trimethylbenzenen-ButylbenzeneAnalytical Methods →C9-C10 AliphaticsIsopropylbenzene1,3,5-Trimethylbenzenen-PropylbenzeneNaphthaleneToluene1,2-DichloropropaneC9-C12 Aliphatics(Uandjusted)Gross Contaminant Levels (GCL)504.1EDBMADEP VPH (historical data used VPH/EPH)C5-C8 Aliphatics(Unadjusted)10/16/2003Monitoring169 <100 <100 24.631.53.4 17.3 <1 -- 7.7 <0.5 -- -- <10 -- -- -- 0.18 14.0 --1/2/2006MonitoringND ND ND ND ND ND ND ND -- 9.3 5.78 ND -- -- -- -- -- -- ND --10/3/2006MonitoringND ND ND ND ND ND ND ND -- 5.5 3.2 ND -- ND -- -- -- -- ND --10/25/2007Monitoring--8/14/2012 Monitoring1,700< 100 < 100 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 1.00 795 13.8 < 0.500 < 0.500 < 5.00 < 0.500 < 0.500 < 0.500 < 0.500 -- < 0.02018/11/2016 Monitoring---- -- <0.500 <0.500 <0.500 <1.00 <0.500 <1.00 455 5.08 <0.500 <0.500 <5.00 <0.500 <0.500 <0.500 <0.500 -- --9/15/2017 9213049 Monitoring---- -- <0.500 <0.500 <0.500 <0.500 <0.500 <0.500 460 4.6 <0.500 <0.500 <0.500 <0.500 <0.500 <0.500 <0.500 -- --12/14/2018 9943004 Monitoring---- -- <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 400 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0 <5.0-- --MW-78/14/2012MW-7 Monitoring196 < 100 < 100 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 1.00 105 < 0.500 < 0.500 < 0.500 < 5.00 < 0.500 < 0.500 < 0.500 < 0.500 -- < 0.0197MW-88/14/2012MW-8 Monitoring< 100 < 100 < 100 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 1.00 < 0.500< 0.500 < 0.500 < 0.500 < 5.00 < 0.500 < 0.500 < 0.500 < 0.500 -- < 0.02003/25/2014490-49450-3 Monitoring-- -- --24,200 24,300 1,810 11,700<5.00 64.6 67.2 <5.0019.926.5 241 1421,23044568.1-- --9/24/2014490-62265-3 Monitoring-- -- --18,400 26,900 1,790 11,400<10.0 56.1 128 <10.016.619.5 212 1181,10038151.4-- --3/18/2015490-74765-3 Monitoring-- -- --20,500 23,600 1,860 12,200<10.0 66.8 118 <10.024.1<10.0 248 1411,24047453.8-- --9/10/2015490-87114 Monitoring-- -- --21,200 26,700 1,760 12,100<10.0 46.9 119 <10.0 <10.0 22.3 153 99.81,13041749.8-- --8/11/2016490-109732-4 Monitoring-- -- --20,900 24,700 1,730 12,900<10.0 56.4 93.1 <10.017.524.8 211 1151,040395 <10.0 -- --9/15/20179213050 Monitoring-- -- --6,10011,000 1,100 7,100<50.0 <50.0 <50.0 <50.0 <50.0 <50.0 140 75800300 <50.0 -- --12/14/20189943005 Monitoring-- -- --11,00016,000 1,000 9,300<50 <50 <50 <50 <50 <50 190 58970370 <50 -- --8/11/2016490-109742-5 Monitoring-- -- -- <0.500 <0.500 <0.500 <1.00 <0.500 <1.00 <0.500 <0.500 <0.500 <0.500 <5.00 <0.500 <0.500 <0.500 <0.500 -- --9/15/20179213051 Monitoring-- -- -- <0.500 <0.500 <0.500 <0.500 <0.500 <0.500 <0.500 <0.500 <0.500 <0.500 <5.00 <0.500 <0.500 <0.500 <0.500 -- --12/14/20189943006 Monitoring-- -- -- <0.5 <0.5 <0.5 <0.5<0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 <0.5 -- --10/16/2003Monitoring1,370 157 <10064.1 11514.0 66.3 2.5 -- 118 <0.5 -- -- <10 -- -- -- 0.48 <5 --1/2/2006Monitoring292 ND ND ND ND ND 3.21 ND -- 46.7 ND ND -- -- -- -- -- -- ND --10/3/2006Monitoring307 285 ND 19.593.81694.1ND--332.45ND--7.79--------ND--10/25/2007MonitoringND ND ND 3.34 ND 5.25 4.42 ND -- 11.5 1.59 ND -- ND -- -- -- -- -- --8/9/2010 Monitoring-- -- -- < 0.500 < 0.500 < 0.500 < 1.00 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 ND<5.00 < 0.500 < 0.500 < 0.500 -- -- --11/22/2010 Monitoring-- -- -- < 0.500 < 0.500 < 0.500 < 1.00 < 0.500 -- < 0.500 < 0.500 < 0.500< 0.500 ND<5.00 < 0.500 < 0.500 < 0.500 < 0.500 -- --2/26/2011 NUC0168-03Monitoring-- -- -- < 0.500 < 0.500 < 0.500 < 1.00 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 5.00 < 0.500 < 0.500 < 0.500 < 0.500 -- --08/14/12DW-1Monitoring 130 < 100 < 100 < 0.500 < 0.500 < 0.500 < 0.500 < 0.500 < 1.00 14.2 1.09 < 0.500 < 0.500 < 5.00 < 0.500 < 0.500 < 0.500 < 0.500 -- < 0.0205Notes:Results reported in µg/L (micrograms per liter) --: Not Analyzed for specific compound< #: Non-detect above laboratory reporting limitND: Non-detect above laboratory reporting limit where laboratory reporting limit not available from historical dataBold: Exceeds NC 2B Surface Water StandardsShaded: Exceeds Gross Contaminant Levels (GCL)MTBE: Methyl tert-Butyl EtherIPE: Diisopropyl EtherEDB: 1, 2 DibromoethaneMW-10MW-6MW-9MW-6Well AbandonedMW-5DW-1DW-1MW-5Page 2 of 2 FIGURES PROJECT LOCATION 1 MILE RADIUS 0.5 MILE RADIUS REFERENCE: BASE MAP USGS 7.5. MIN. TOPO. QUAD., GREENSBORO, NC, 1951, REVISED 1994. CONTOUR INTERVAL = 10 FEET Approximate Scale: 1 in. = 2000 ft. 0 2000'4000' NORTH CAROLINA SITE LOCATION MAP FORMER EXXONMOBIL FACILITY #99-GRE 101 N SPRING STREET GREENSBORO, NORTH CAROLINA ANNUAL CAP MONITORING REPORT - 2018 1IMAGES: NC_Greensboro.tifXREFS:CITY: SYRACUSE, NY DIV/GROUP: EBC-IM/DV DB/LD: L.POSENAUER PIC: T.HOPPER PM/TM: J. FARLEY TR: P. 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ROBERTS PIN # 7864-46-3836 DB 2798 PG 252 N/F PARCEL INFORMATION N/A VIA GIS PIN # N/A DB & PG N/A INLET INLETS INLETS INLETS S INLETINLET INLETWWD D INLETD D INLETD INLETD D D D INLET INLETD D D INLET S D W SITE MAP 2 FORMER EXXONMOBIL FACILITY #99-GRE 101 N SPRING STREET GREENSBORO, NORTH CAROLINA ANNUAL CAP MONITORING REPORT - 2018 CITY: SYRACUSE, NY DIV/GROUP: EBC-IM/DV DB/LD: L.POSENAUER PIC: T.HOPPER PM/TM: J. FARLEY TR: P. 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ROBERTS PIN # 7864-46-3836 DB 2798 PG 252 N/F PARCEL INFORMATION N/A VIA GIS PIN # N/A DB & PG N/A S S S S WW786.00787.00788.00MW-2 MW-7 (NM) MW-1R(787.95) MW-8 (786.95) MW-5 MW-3 MW-10 (NS)785.00785.00786.00787.00788.00MW-6 (785.00)MW-DW1(786.72) MW-4(786.58) MW-9 (NS) S D W (786.95) (NS) POTENTIOMETRIC SURFACE MAP DECEMBER 14, 2018 786.50 (NM) 3 FORMER EXXONMOBIL FACILITY #99-GRE 101 N SPRING STREET GREENSBORO, NORTH CAROLINA ANNUAL CAP MONITORING REPORT - 2018 CITY: SYRACUSE, NY DIV/GROUP: EBC-IM/DV DB/LD: L.POSENAUER PIC: T.HOPPER PM/TM: J. FARLEY TR: P. 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ROBERTS PIN # 7864-46-3836 DB 2798 PG 252 N/F PARCEL INFORMATION N/A VIA GIS PIN # N/A DB & PG N/A S S S S WW97 MW-6 (<5.0) MW-10 (<0.500) MW-2 MW-7 MW-8MW-5 MW-3 MW-4 (220) MW-1R (1,500) MW-9(1,000) MW-DW1 W E S T M A R K E T S T R E E T 7 FORMER EXXONMOBIL FACILITY #99-GRE 101 N SPRING STREET GREENSBORO, NORTH CAROLINA ANNUAL CAP MONITORING REPORT - 2018 CITY: SYRACUSE, NY DIV/GROUP: EBC-IM/DV DB/LD: L.POSENAUER PIC: T.HOPPER PM/TM: J. FARLEY TR: P. 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ROBERTS PIN # 7864-46-3836 DB 2798 PG 252 N/F PARCEL INFORMATION N/A VIA GIS PIN # N/A DB & PG N/A S S S S WW390 MW-6 (<5.0) MW-10 (<0.500) MW-2 MW-7 MW-8MW-5 MW-3 MW-4 (22) MW-1R (930) MW-9(970) MW-DW1 W E S T M A R K E T S T R E E T 9 FORMER EXXONMOBIL FACILITY #99-GRE 101 N SPRING STREET GREENSBORO, NORTH CAROLINA ANNUAL CAP MONITORING REPORT - 2018 CITY: SYRACUSE, NY DIV/GROUP: EBC-IM/DV DB/LD: L.POSENAUER PIC: T.HOPPER PM/TM: J. FARLEY TR: P. GOODELL LYR: ON=*;OFF=REFC:\Users\dki00653\OneDrive - ARCADIS\BIM 360 Docs\EXXONMOBIL\99GRE - 615 WEST FRIENDLY AVENUE, GREENSBORO, NC\2019\B0085851.0048\01-DWG\99GRE-GWE-FIG 5-9 ISO CONC.dwg LAYOUT: 9 SAVED: 2/19/2019 11:58 AM ACADVER: 21.0S (LMS TECH) PAGESETUP: ----PLOTSTYLETABLE: ---- PLOTTED: 2/19/2019 12:00 PM BY: KAMBLE, DEVESHIMAGES:XREFS: X-TITLE X-BASEFIGURE 1,2,4-TRIMETHYLBENZENE ISOCONCENTRATION MAP DECEMBER 14, 2018 S D W (970) (ug/L) 390 MW-DW1 MW-4 MW-1R MW-9 INLET INLETD W E S T M A R K E T S T R E E T IP-03 IP-01 IP-08 IP-11 IP-02 IP-07 IP-09 IP-10 IP-13 IP-05 IP-06 IP-04 IP-12 NORTH SPRING S T R E E TCHEMICAL INJECTION LAYOUT 10 FORMER EXXONMOBIL FACILITY #99-GRE 101 N SPRING STREET GREENSBORO, NORTH CAROLINA ANNUAL CAP MONITORING REPORT - 2018 CITY: SYRACUSE, NY DIV/GROUP: EBC-IM/DV DB/LD: L.POSENAUER PIC: T.HOPPER PM/TM: J. FARLEY TR: P. GOODELL LYR: ON=*;OFF=REFC:\Users\dki00653\OneDrive - ARCADIS\BIM 360 Docs\EXXONMOBIL\99GRE - 615 WEST FRIENDLY AVENUE, GREENSBORO, NC\2019\B0085851.0048\01-DWG\99GRE-GWE-FIG 10 IP MAP.dwg LAYOUT: 10 SAVED: 2/26/2019 3:54 PM ACADVER: 21.0S (LMS TECH) PAGESETUP: ----PLOTSTYLETABLE: ---- PLOTTED: 2/26/2019 3:56 PM BY: KAMBLE, DEVESHIMAGES:XREFS: X-TITLEFIGURE INLET D APPENDIX A Laboratory Analytical Report and Chain-of-Custody – December 26, 2018 ANALYSIS REPORT Prepared by: Eurofins Lancaster Laboratories Environmental 2425 New Holland Pike Lancaster, PA 17601 Prepared for: ExxonMobil c/o Arcadis 801 Corporate Center Drive Suite 300 Raleigh NC 27607 Report Date: December 26, 2018 20:13 Project: 99-GRE - Greensboro, NC Account #: 42309 Group Number: 2019146 PO Number: B0085851.0048 Release Number: CAMPBELL State of Sample Origin: NC Electronic Copy To Arcadis Attn: Francisco Corella Electronic Copy To ExxonMobil c/o Arcadis Attn: Kim Abbott Electronic Copy To Arcadis Attn: Theresa McGuire Respectfully Submitted, (717) 556-7261 To view our laboratory's current scopes of accreditation please go to http://www.eurofinsus.com/environment- testing/laboratories/eurofins-lancaster-laboratories-environmental/resources/certifications/ . Historical copies may be requested through your project manager. Page 1 of 24 SAMPLE INFORMATION Client Sample Description Sample Collection Date/Time ELLE# MW-1R Grab Groundwater 12/14/2018 13:15 9943002 MW-4 Grab Groundwater 12/14/2018 13:45 9943003 MW-6 Grab Groundwater 12/14/2018 13:55 9943004 MW-9 Grab Groundwater 12/14/2018 13:30 9943005 MW-10 Grab Groundwater 12/14/2018 14:05 9943006 Trip Blank Water 12/14/2018 9943007 The specific methodologies used in obtaining the enclosed analytical results are indicated on the Laboratory Sample Analysis Record. Page 2 of 24 ExxonMobil c/o Arcadis ELLE Sample #: WW 9943002 ELLE Group #: 2019146 Matrix: Groundwater Sample Description: MW-1R Grab Groundwater EM# 99-GRE 615 West Friendly Ave - Greensboro, NC Project Name: 99-GRE - Greensboro, NC Collection Date/Time: 12/14/2018 13:15 Submittal Date/Time: 12/15/2018 10:40 Analysis Name CAT No. Dilution Factor CAS Number Result Limit of Quantitation SM 6200 B-1997 ug/l ug/l GC/MS Volatiles 10460 Benzene 71-43-2 8,400 500 1000 10460 Bromobenzene 108-86-1 < 50 50 100 10460 Bromochloromethane 74-97-5 < 50 50 100 10460 Bromodichloromethane 75-27-4 < 50 50 100 10460 Bromoform 75-25-2 < 50 50 100 10460 Bromomethane 74-83-9 < 50 50 100 10460 n-Butylbenzene 104-51-8 < 50 50 100 10460 sec-Butylbenzene 135-98-8 < 50 50 100 10460 tert-Butylbenzene 98-06-6 < 50 50 100 10460 Carbon Tetrachloride 56-23-5 < 50 50 100 10460 Chlorobenzene 108-90-7 < 50 50 100 10460 Chloroethane 75-00-3 < 50 50 100 10460 Chloroform 67-66-3 < 50 50 100 10460 Chloromethane 74-87-3 < 80 80 100 10460 2-Chlorotoluene 95-49-8 < 50 50 100 10460 4-Chlorotoluene 106-43-4 < 50 50 100 10460 1,2-Dibromo-3-chloropropane 96-12-8 < 200 200 100 10460 Dibromochloromethane 124-48-1 < 50 50 100 10460 1,2-Dibromoethane 106-93-4 < 50 50 100 10460 Dibromomethane 74-95-3 < 50 50 100 10460 1,2-Dichlorobenzene 95-50-1 < 50 50 100 10460 1,3-Dichlorobenzene 541-73-1 < 50 50 100 10460 1,4-Dichlorobenzene 106-46-7 < 50 50 100 10460 Dichlorodifluoromethane 75-71-8 < 50 50 100 10460 1,1-Dichloroethane 75-34-3 < 50 50 100 10460 1,2-Dichloroethane 107-06-2 < 50 50 100 10460 1,1-Dichloroethene 75-35-4 < 50 50 100 10460 cis-1,2-Dichloroethene 156-59-2 < 50 50 100 10460 trans-1,2-Dichloroethene 156-60-5 < 50 50 100 10460 1,2-Dichloropropane 78-87-5 < 50 50 100 10460 1,3-Dichloropropane 142-28-9 < 50 50 100 10460 2,2-Dichloropropane 594-20-7 < 50 50 100 10460 1,1-Dichloropropene 563-58-6 < 50 50 100 10460 cis-1,3-Dichloropropene 10061-01-5 < 50 50 100 10460 trans-1,3-Dichloropropene 10061-02-6 < 50 50 100 10460 Ethanol 64-17-5 < 20,000 20,000 100 10460 Ethylbenzene 100-41-4 1,500 50 100 10460 Hexachlorobutadiene 87-68-3 < 50 50 100 10460 di-Isopropyl Ether 108-20-3 120 50 100 10460 Isopropylbenzene 98-82-8 61 50 100 10460 p-Isopropyltoluene 99-87-6 < 50 50 100 10460 Methyl Tertiary Butyl Ether 1634-04-4 < 50 50 100 10460 Methylene Chloride 75-09-2 < 80 80 100 10460 Naphthalene 91-20-3 120 50 100 10460 n-Propylbenzene 103-65-1 100 50 100 10460 Styrene 100-42-5 100 50 100 10460 1,1,1,2-Tetrachloroethane 630-20-6 < 50 50 100 10460 1,1,2,2-Tetrachloroethane 79-34-5 < 50 50 100 10460 Tetrachloroethene 127-18-4 < 50 50 100 Page 3 of 24 ExxonMobil c/o Arcadis ELLE Sample #: WW 9943002 ELLE Group #: 2019146 Matrix: Groundwater Sample Description: MW-1R Grab Groundwater EM# 99-GRE 615 West Friendly Ave - Greensboro, NC Project Name: 99-GRE - Greensboro, NC Collection Date/Time: 12/14/2018 13:15 Submittal Date/Time: 12/15/2018 10:40 Analysis Name CAT No. Dilution Factor CAS Number Result Limit of Quantitation SM 6200 B-1997 ug/l ug/l GC/MS Volatiles 10460 Toluene 108-88-3 9,600 500 1000 10460 1,2,3-Trichlorobenzene 87-61-6 < 50 50 100 10460 1,2,4-Trichlorobenzene 120-82-1 < 50 50 100 10460 1,1,1-Trichloroethane 71-55-6 < 50 50 100 10460 1,1,2-Trichloroethane 79-00-5 < 50 50 100 10460 Trichloroethene 79-01-6 < 50 50 100 10460 Trichlorofluoromethane 75-69-4 < 50 50 100 10460 1,2,3-Trichloropropane 96-18-4 < 200 200 100 10460 1,2,4-Trimethylbenzene 95-63-6 930 50 100 10460 1,3,5-Trimethylbenzene 108-67-8 590 50 100 10460 Vinyl Chloride 75-01-4 < 50 50 100 10460 Xylene (Total) 1330-20-7 8,300 500 1000 A preserved vial was submitted for analysis. However, the pH at the time of analysis was 12. Sample Comments State of North Carolina Lab Certification No. 521 Laboratory Sample Analysis Record Analyst Dilution Factor Trial# Batch# Analysis Date and Time CAT No. Analysis Name Method 10460 VOCs- 25ml Water by 6200B SM 6200 B-1997 1 G183581AA 12/24/2018 11:42 Kevin A Sposito 100 10460 VOCs- 25ml Water by 6200B SM 6200 B-1997 1 G183581AA 12/24/2018 12:06 Kevin A Sposito 1000 01163 GC/MS VOA Water Prep SW-846 5030B 1 G183581AA 12/24/2018 11:41 Kevin A Sposito 100 01163 GC/MS VOA Water Prep SW-846 5030B 2 G183581AA 12/24/2018 12:05 Kevin A Sposito 1000 Page 4 of 24 ExxonMobil c/o Arcadis ELLE Sample #: WW 9943003 ELLE Group #: 2019146 Matrix: Groundwater Sample Description: MW-4 Grab Groundwater EM# 99-GRE 615 West Friendly Ave - Greensboro, NC Project Name: 99-GRE - Greensboro, NC Collection Date/Time: 12/14/2018 13:45 Submittal Date/Time: 12/15/2018 10:40 Analysis Name CAT No. Dilution Factor CAS Number Result Limit of Quantitation SM 6200 B-1997 ug/l ug/l GC/MS Volatiles 10460 Benzene 71-43-2 440 25 50 10460 Bromobenzene 108-86-1 < 5.0 5.0 10 10460 Bromochloromethane 74-97-5 < 5.0 5.0 10 10460 Bromodichloromethane 75-27-4 < 5.0 5.0 10 10460 Bromoform 75-25-2 < 5.0 5.0 10 10460 Bromomethane 74-83-9 < 5.0 5.0 10 10460 n-Butylbenzene 104-51-8 < 5.0 5.0 10 10460 sec-Butylbenzene 135-98-8 < 5.0 5.0 10 10460 tert-Butylbenzene 98-06-6 < 5.0 5.0 10 10460 Carbon Tetrachloride 56-23-5 < 5.0 5.0 10 10460 Chlorobenzene 108-90-7 < 5.0 5.0 10 10460 Chloroethane 75-00-3 < 5.0 5.0 10 10460 Chloroform 67-66-3 < 5.0 5.0 10 10460 Chloromethane 74-87-3 < 8.0 8.0 10 10460 2-Chlorotoluene 95-49-8 < 5.0 5.0 10 10460 4-Chlorotoluene 106-43-4 < 5.0 5.0 10 10460 1,2-Dibromo-3-chloropropane 96-12-8 < 20 20 10 10460 Dibromochloromethane 124-48-1 < 5.0 5.0 10 10460 1,2-Dibromoethane 106-93-4 < 5.0 5.0 10 10460 Dibromomethane 74-95-3 < 5.0 5.0 10 10460 1,2-Dichlorobenzene 95-50-1 < 5.0 5.0 10 10460 1,3-Dichlorobenzene 541-73-1 < 5.0 5.0 10 10460 1,4-Dichlorobenzene 106-46-7 < 5.0 5.0 10 10460 Dichlorodifluoromethane 75-71-8 < 5.0 5.0 10 10460 1,1-Dichloroethane 75-34-3 < 5.0 5.0 10 10460 1,2-Dichloroethane 107-06-2 < 5.0 5.0 10 10460 1,1-Dichloroethene 75-35-4 < 5.0 5.0 10 10460 cis-1,2-Dichloroethene 156-59-2 < 5.0 5.0 10 10460 trans-1,2-Dichloroethene 156-60-5 < 5.0 5.0 10 10460 1,2-Dichloropropane 78-87-5 < 5.0 5.0 10 10460 1,3-Dichloropropane 142-28-9 < 5.0 5.0 10 10460 2,2-Dichloropropane 594-20-7 < 5.0 5.0 10 10460 1,1-Dichloropropene 563-58-6 < 5.0 5.0 10 10460 cis-1,3-Dichloropropene 10061-01-5 < 5.0 5.0 10 10460 trans-1,3-Dichloropropene 10061-02-6 < 5.0 5.0 10 10460 Ethanol 64-17-5 < 2,000 2,000 10 10460 Ethylbenzene 100-41-4 220 5.0 10 10460 Hexachlorobutadiene 87-68-3 < 5.0 5.0 10 10460 di-Isopropyl Ether 108-20-3 310 25 50 10460 Isopropylbenzene 98-82-8 15 5.0 10 10460 p-Isopropyltoluene 99-87-6 < 5.0 5.0 10 10460 Methyl Tertiary Butyl Ether 1634-04-4 < 5.0 5.0 10 10460 Methylene Chloride 75-09-2 < 8.0 8.0 10 10460 Naphthalene 91-20-3 31 5.0 10 10460 n-Propylbenzene 103-65-1 35 5.0 10 10460 Styrene 100-42-5 < 5.0 5.0 10 10460 1,1,1,2-Tetrachloroethane 630-20-6 < 5.0 5.0 10 10460 1,1,2,2-Tetrachloroethane 79-34-5 < 5.0 5.0 10 10460 Tetrachloroethene 127-18-4 < 5.0 5.0 10 Page 5 of 24 ExxonMobil c/o Arcadis ELLE Sample #: WW 9943003 ELLE Group #: 2019146 Matrix: Groundwater Sample Description: MW-4 Grab Groundwater EM# 99-GRE 615 West Friendly Ave - Greensboro, NC Project Name: 99-GRE - Greensboro, NC Collection Date/Time: 12/14/2018 13:45 Submittal Date/Time: 12/15/2018 10:40 Analysis Name CAT No. Dilution Factor CAS Number Result Limit of Quantitation SM 6200 B-1997 ug/l ug/l GC/MS Volatiles 10460 Toluene 108-88-3 9.7 5.0 10 10460 1,2,3-Trichlorobenzene 87-61-6 < 5.0 5.0 10 10460 1,2,4-Trichlorobenzene 120-82-1 < 5.0 5.0 10 10460 1,1,1-Trichloroethane 71-55-6 < 5.0 5.0 10 10460 1,1,2-Trichloroethane 79-00-5 < 5.0 5.0 10 10460 Trichloroethene 79-01-6 < 5.0 5.0 10 10460 Trichlorofluoromethane 75-69-4 < 5.0 5.0 10 10460 1,2,3-Trichloropropane 96-18-4 < 20 20 10 10460 1,2,4-Trimethylbenzene 95-63-6 22 5.0 10 10460 1,3,5-Trimethylbenzene 108-67-8 5.7 5.0 10 10460 Vinyl Chloride 75-01-4 < 5.0 5.0 10 10460 Xylene (Total) 1330-20-7 43 5.0 10 Sample Comments State of North Carolina Lab Certification No. 521 Laboratory Sample Analysis Record Analyst Dilution Factor Trial# Batch# Analysis Date and Time CAT No. Analysis Name Method 10460 VOCs- 25ml Water by 6200B SM 6200 B-1997 1 G183581AA 12/24/2018 12:31 Kevin A Sposito 50 10460 VOCs- 25ml Water by 6200B SM 6200 B-1997 1 G183581AA 12/24/2018 14:55 Kevin A Sposito 10 01163 GC/MS VOA Water Prep SW-846 5030B 1 G183581AA 12/24/2018 12:30 Kevin A Sposito 50 01163 GC/MS VOA Water Prep SW-846 5030B 2 G183581AA 12/24/2018 14:54 Kevin A Sposito 10 Page 6 of 24 ExxonMobil c/o Arcadis ELLE Sample #: WW 9943004 ELLE Group #: 2019146 Matrix: Groundwater Sample Description: MW-6 Grab Groundwater EM# 99-GRE 615 West Friendly Ave - Greensboro, NC Project Name: 99-GRE - Greensboro, NC Collection Date/Time: 12/14/2018 13:55 Submittal Date/Time: 12/15/2018 10:40 Analysis Name CAT No. Dilution Factor CAS Number Result Limit of Quantitation SM 6200 B-1997 ug/l ug/l GC/MS Volatiles 10460 Benzene 71-43-2 < 5.0 5.0 10 10460 Bromobenzene 108-86-1 < 5.0 5.0 10 10460 Bromochloromethane 74-97-5 < 5.0 5.0 10 10460 Bromodichloromethane 75-27-4 < 5.0 5.0 10 10460 Bromoform 75-25-2 < 5.0 5.0 10 10460 Bromomethane 74-83-9 < 5.0 5.0 10 10460 n-Butylbenzene 104-51-8 < 5.0 5.0 10 10460 sec-Butylbenzene 135-98-8 < 5.0 5.0 10 10460 tert-Butylbenzene 98-06-6 < 5.0 5.0 10 10460 Carbon Tetrachloride 56-23-5 < 5.0 5.0 10 10460 Chlorobenzene 108-90-7 < 5.0 5.0 10 10460 Chloroethane 75-00-3 < 5.0 5.0 10 10460 Chloroform 67-66-3 < 5.0 5.0 10 10460 Chloromethane 74-87-3 < 8.0 8.0 10 10460 2-Chlorotoluene 95-49-8 < 5.0 5.0 10 10460 4-Chlorotoluene 106-43-4 < 5.0 5.0 10 10460 1,2-Dibromo-3-chloropropane 96-12-8 < 20 20 10 10460 Dibromochloromethane 124-48-1 < 5.0 5.0 10 10460 1,2-Dibromoethane 106-93-4 < 5.0 5.0 10 10460 Dibromomethane 74-95-3 < 5.0 5.0 10 10460 1,2-Dichlorobenzene 95-50-1 < 5.0 5.0 10 10460 1,3-Dichlorobenzene 541-73-1 < 5.0 5.0 10 10460 1,4-Dichlorobenzene 106-46-7 < 5.0 5.0 10 10460 Dichlorodifluoromethane 75-71-8 < 5.0 5.0 10 10460 1,1-Dichloroethane 75-34-3 < 5.0 5.0 10 10460 1,2-Dichloroethane 107-06-2 < 5.0 5.0 10 10460 1,1-Dichloroethene 75-35-4 < 5.0 5.0 10 10460 cis-1,2-Dichloroethene 156-59-2 < 5.0 5.0 10 10460 trans-1,2-Dichloroethene 156-60-5 < 5.0 5.0 10 10460 1,2-Dichloropropane 78-87-5 < 5.0 5.0 10 10460 1,3-Dichloropropane 142-28-9 < 5.0 5.0 10 10460 2,2-Dichloropropane 594-20-7 < 5.0 5.0 10 10460 1,1-Dichloropropene 563-58-6 < 5.0 5.0 10 10460 cis-1,3-Dichloropropene 10061-01-5 < 5.0 5.0 10 10460 trans-1,3-Dichloropropene 10061-02-6 < 5.0 5.0 10 10460 Ethanol 64-17-5 < 2,000 2,000 10 10460 Ethylbenzene 100-41-4 < 5.0 5.0 10 10460 Hexachlorobutadiene 87-68-3 < 5.0 5.0 10 10460 di-Isopropyl Ether 108-20-3 400 25 50 10460 Isopropylbenzene 98-82-8 < 5.0 5.0 10 10460 p-Isopropyltoluene 99-87-6 < 5.0 5.0 10 10460 Methyl Tertiary Butyl Ether 1634-04-4 < 5.0 5.0 10 10460 Methylene Chloride 75-09-2 < 8.0 8.0 10 10460 Naphthalene 91-20-3 < 5.0 5.0 10 10460 n-Propylbenzene 103-65-1 < 5.0 5.0 10 10460 Styrene 100-42-5 < 5.0 5.0 10 10460 1,1,1,2-Tetrachloroethane 630-20-6 < 5.0 5.0 10 10460 1,1,2,2-Tetrachloroethane 79-34-5 < 5.0 5.0 10 10460 Tetrachloroethene 127-18-4 < 5.0 5.0 10 Page 7 of 24 ExxonMobil c/o Arcadis ELLE Sample #: WW 9943004 ELLE Group #: 2019146 Matrix: Groundwater Sample Description: MW-6 Grab Groundwater EM# 99-GRE 615 West Friendly Ave - Greensboro, NC Project Name: 99-GRE - Greensboro, NC Collection Date/Time: 12/14/2018 13:55 Submittal Date/Time: 12/15/2018 10:40 Analysis Name CAT No. Dilution Factor CAS Number Result Limit of Quantitation SM 6200 B-1997 ug/l ug/l GC/MS Volatiles 10460 Toluene 108-88-3 < 5.0 5.0 10 10460 1,2,3-Trichlorobenzene 87-61-6 < 5.0 5.0 10 10460 1,2,4-Trichlorobenzene 120-82-1 < 5.0 5.0 10 10460 1,1,1-Trichloroethane 71-55-6 < 5.0 5.0 10 10460 1,1,2-Trichloroethane 79-00-5 < 5.0 5.0 10 10460 Trichloroethene 79-01-6 < 5.0 5.0 10 10460 Trichlorofluoromethane 75-69-4 < 5.0 5.0 10 10460 1,2,3-Trichloropropane 96-18-4 < 20 20 10 10460 1,2,4-Trimethylbenzene 95-63-6 < 5.0 5.0 10 10460 1,3,5-Trimethylbenzene 108-67-8 < 5.0 5.0 10 10460 Vinyl Chloride 75-01-4 < 5.0 5.0 10 10460 Xylene (Total) 1330-20-7 < 5.0 5.0 10 Sample Comments State of North Carolina Lab Certification No. 521 Laboratory Sample Analysis Record Analyst Dilution Factor Trial# Batch# Analysis Date and Time CAT No. Analysis Name Method 10460 VOCs- 25ml Water by 6200B SM 6200 B-1997 1 G183581AA 12/24/2018 13:19 Kevin A Sposito 50 10460 VOCs- 25ml Water by 6200B SM 6200 B-1997 1 G183581AA 12/24/2018 15:20 Kevin A Sposito 10 01163 GC/MS VOA Water Prep SW-846 5030B 1 G183581AA 12/24/2018 13:18 Kevin A Sposito 50 01163 GC/MS VOA Water Prep SW-846 5030B 2 G183581AA 12/24/2018 15:19 Kevin A Sposito 10 Page 8 of 24 ExxonMobil c/o Arcadis ELLE Sample #: WW 9943005 ELLE Group #: 2019146 Matrix: Groundwater Sample Description: MW-9 Grab Groundwater EM# 99-GRE 615 West Friendly Ave - Greensboro, NC Project Name: 99-GRE - Greensboro, NC Collection Date/Time: 12/14/2018 13:30 Submittal Date/Time: 12/15/2018 10:40 Analysis Name CAT No. Dilution Factor CAS Number Result Limit of Quantitation SM 6200 B-1997 ug/l ug/l GC/MS Volatiles 10460 Benzene 71-43-2 11,000 500 1000 10460 Bromobenzene 108-86-1 < 50 50 100 10460 Bromochloromethane 74-97-5 < 50 50 100 10460 Bromodichloromethane 75-27-4 < 50 50 100 10460 Bromoform 75-25-2 < 50 50 100 10460 Bromomethane 74-83-9 < 50 50 100 10460 n-Butylbenzene 104-51-8 < 50 50 100 10460 sec-Butylbenzene 135-98-8 < 50 50 100 10460 tert-Butylbenzene 98-06-6 < 50 50 100 10460 Carbon Tetrachloride 56-23-5 < 50 50 100 10460 Chlorobenzene 108-90-7 < 50 50 100 10460 Chloroethane 75-00-3 < 50 50 100 10460 Chloroform 67-66-3 < 50 50 100 10460 Chloromethane 74-87-3 < 80 80 100 10460 2-Chlorotoluene 95-49-8 < 50 50 100 10460 4-Chlorotoluene 106-43-4 < 50 50 100 10460 1,2-Dibromo-3-chloropropane 96-12-8 < 200 200 100 10460 Dibromochloromethane 124-48-1 < 50 50 100 10460 1,2-Dibromoethane 106-93-4 < 50 50 100 10460 Dibromomethane 74-95-3 < 50 50 100 10460 1,2-Dichlorobenzene 95-50-1 < 50 50 100 10460 1,3-Dichlorobenzene 541-73-1 < 50 50 100 10460 1,4-Dichlorobenzene 106-46-7 < 50 50 100 10460 Dichlorodifluoromethane 75-71-8 < 50 50 100 10460 1,1-Dichloroethane 75-34-3 < 50 50 100 10460 1,2-Dichloroethane 107-06-2 < 50 50 100 10460 1,1-Dichloroethene 75-35-4 < 50 50 100 10460 cis-1,2-Dichloroethene 156-59-2 < 50 50 100 10460 trans-1,2-Dichloroethene 156-60-5 < 50 50 100 10460 1,2-Dichloropropane 78-87-5 < 50 50 100 10460 1,3-Dichloropropane 142-28-9 < 50 50 100 10460 2,2-Dichloropropane 594-20-7 < 50 50 100 10460 1,1-Dichloropropene 563-58-6 < 50 50 100 10460 cis-1,3-Dichloropropene 10061-01-5 < 50 50 100 10460 trans-1,3-Dichloropropene 10061-02-6 < 50 50 100 10460 Ethanol 64-17-5 < 20,000 20,000 100 10460 Ethylbenzene 100-41-4 1,000 50 100 10460 Hexachlorobutadiene 87-68-3 < 50 50 100 10460 di-Isopropyl Ether 108-20-3 < 50 50 100 10460 Isopropylbenzene 98-82-8 < 50 50 100 10460 p-Isopropyltoluene 99-87-6 < 50 50 100 10460 Methyl Tertiary Butyl Ether 1634-04-4 < 50 50 100 10460 Methylene Chloride 75-09-2 < 80 80 100 10460 Naphthalene 91-20-3 190 50 100 10460 n-Propylbenzene 103-65-1 58 50 100 10460 Styrene 100-42-5 < 50 50 100 10460 1,1,1,2-Tetrachloroethane 630-20-6 < 50 50 100 10460 1,1,2,2-Tetrachloroethane 79-34-5 < 50 50 100 10460 Tetrachloroethene 127-18-4 < 50 50 100 Page 9 of 24 ExxonMobil c/o Arcadis ELLE Sample #: WW 9943005 ELLE Group #: 2019146 Matrix: Groundwater Sample Description: MW-9 Grab Groundwater EM# 99-GRE 615 West Friendly Ave - Greensboro, NC Project Name: 99-GRE - Greensboro, NC Collection Date/Time: 12/14/2018 13:30 Submittal Date/Time: 12/15/2018 10:40 Analysis Name CAT No. Dilution Factor CAS Number Result Limit of Quantitation SM 6200 B-1997 ug/l ug/l GC/MS Volatiles 10460 Toluene 108-88-3 16,000 500 1000 10460 1,2,3-Trichlorobenzene 87-61-6 < 50 50 100 10460 1,2,4-Trichlorobenzene 120-82-1 < 50 50 100 10460 1,1,1-Trichloroethane 71-55-6 < 50 50 100 10460 1,1,2-Trichloroethane 79-00-5 < 50 50 100 10460 Trichloroethene 79-01-6 < 50 50 100 10460 Trichlorofluoromethane 75-69-4 < 50 50 100 10460 1,2,3-Trichloropropane 96-18-4 < 200 200 100 10460 1,2,4-Trimethylbenzene 95-63-6 970 50 100 10460 1,3,5-Trimethylbenzene 108-67-8 370 50 100 10460 Vinyl Chloride 75-01-4 < 50 50 100 10460 Xylene (Total) 1330-20-7 9,300 500 1000 Sample Comments State of North Carolina Lab Certification No. 521 Laboratory Sample Analysis Record Analyst Dilution Factor Trial# Batch# Analysis Date and Time CAT No. Analysis Name Method 10460 VOCs- 25ml Water by 6200B SM 6200 B-1997 1 G183581AA 12/24/2018 14:07 Kevin A Sposito 100 10460 VOCs- 25ml Water by 6200B SM 6200 B-1997 1 G183581AA 12/24/2018 14:31 Kevin A Sposito 1000 01163 GC/MS VOA Water Prep SW-846 5030B 1 G183581AA 12/24/2018 14:06 Kevin A Sposito 100 01163 GC/MS VOA Water Prep SW-846 5030B 2 G183581AA 12/24/2018 14:30 Kevin A Sposito 1000 Page 10 of 24 ExxonMobil c/o Arcadis ELLE Sample #: WW 9943006 ELLE Group #: 2019146 Matrix: Groundwater Sample Description: MW-10 Grab Groundwater EM# 99-GRE 615 West Friendly Ave - Greensboro, NC Project Name: 99-GRE - Greensboro, NC Collection Date/Time: 12/14/2018 14:05 Submittal Date/Time: 12/15/2018 10:40 Analysis Name CAT No. Dilution Factor CAS Number Result Limit of Quantitation SM 6200 B-1997 ug/l ug/l GC/MS Volatiles 10460 Benzene 71-43-2 < 0.5 0.5 1 10460 Bromobenzene 108-86-1 < 0.5 0.5 1 10460 Bromochloromethane 74-97-5 < 0.5 0.5 1 10460 Bromodichloromethane 75-27-4 < 0.5 0.5 1 10460 Bromoform 75-25-2 < 0.5 0.5 1 10460 Bromomethane 74-83-9 < 0.5 0.5 1 10460 n-Butylbenzene 104-51-8 < 0.5 0.5 1 10460 sec-Butylbenzene 135-98-8 < 0.5 0.5 1 10460 tert-Butylbenzene 98-06-6 < 0.5 0.5 1 10460 Carbon Tetrachloride 56-23-5 < 0.5 0.5 1 10460 Chlorobenzene 108-90-7 < 0.5 0.5 1 10460 Chloroethane 75-00-3 < 0.5 0.5 1 10460 Chloroform 67-66-3 < 0.5 0.5 1 10460 Chloromethane 74-87-3 < 0.8 0.8 1 10460 2-Chlorotoluene 95-49-8 < 0.5 0.5 1 10460 4-Chlorotoluene 106-43-4 < 0.5 0.5 1 10460 1,2-Dibromo-3-chloropropane 96-12-8 < 2.0 2.0 1 10460 Dibromochloromethane 124-48-1 < 0.5 0.5 1 10460 1,2-Dibromoethane 106-93-4 < 0.5 0.5 1 10460 Dibromomethane 74-95-3 < 0.5 0.5 1 10460 1,2-Dichlorobenzene 95-50-1 < 0.5 0.5 1 10460 1,3-Dichlorobenzene 541-73-1 < 0.5 0.5 1 10460 1,4-Dichlorobenzene 106-46-7 < 0.5 0.5 1 10460 Dichlorodifluoromethane 75-71-8 < 0.5 0.5 1 10460 1,1-Dichloroethane 75-34-3 < 0.5 0.5 1 10460 1,2-Dichloroethane 107-06-2 < 0.5 0.5 1 10460 1,1-Dichloroethene 75-35-4 < 0.5 0.5 1 10460 cis-1,2-Dichloroethene 156-59-2 < 0.5 0.5 1 10460 trans-1,2-Dichloroethene 156-60-5 < 0.5 0.5 1 10460 1,2-Dichloropropane 78-87-5 < 0.5 0.5 1 10460 1,3-Dichloropropane 142-28-9 < 0.5 0.5 1 10460 2,2-Dichloropropane 594-20-7 < 0.5 0.5 1 10460 1,1-Dichloropropene 563-58-6 < 0.5 0.5 1 10460 cis-1,3-Dichloropropene 10061-01-5 < 0.5 0.5 1 10460 trans-1,3-Dichloropropene 10061-02-6 < 0.5 0.5 1 10460 Ethanol 64-17-5 < 200 200 1 10460 Ethylbenzene 100-41-4 < 0.5 0.5 1 10460 Hexachlorobutadiene 87-68-3 < 0.5 0.5 1 10460 di-Isopropyl Ether 108-20-3 < 0.5 0.5 1 10460 Isopropylbenzene 98-82-8 < 0.5 0.5 1 10460 p-Isopropyltoluene 99-87-6 < 0.5 0.5 1 10460 Methyl Tertiary Butyl Ether 1634-04-4 < 0.5 0.5 1 10460 Methylene Chloride 75-09-2 < 0.8 0.8 1 10460 Naphthalene 91-20-3 < 0.5 0.5 1 10460 n-Propylbenzene 103-65-1 < 0.5 0.5 1 10460 Styrene 100-42-5 < 0.5 0.5 1 10460 1,1,1,2-Tetrachloroethane 630-20-6 < 0.5 0.5 1 10460 1,1,2,2-Tetrachloroethane 79-34-5 < 0.5 0.5 1 10460 Tetrachloroethene 127-18-4 < 0.5 0.5 1 Page 11 of 24 ExxonMobil c/o Arcadis ELLE Sample #: WW 9943006 ELLE Group #: 2019146 Matrix: Groundwater Sample Description: MW-10 Grab Groundwater EM# 99-GRE 615 West Friendly Ave - Greensboro, NC Project Name: 99-GRE - Greensboro, NC Collection Date/Time: 12/14/2018 14:05 Submittal Date/Time: 12/15/2018 10:40 Analysis Name CAT No. Dilution Factor CAS Number Result Limit of Quantitation SM 6200 B-1997 ug/l ug/l GC/MS Volatiles 10460 Toluene 108-88-3 < 0.5 0.5 1 10460 1,2,3-Trichlorobenzene 87-61-6 < 0.5 0.5 1 10460 1,2,4-Trichlorobenzene 120-82-1 < 0.5 0.5 1 10460 1,1,1-Trichloroethane 71-55-6 < 0.5 0.5 1 10460 1,1,2-Trichloroethane 79-00-5 < 0.5 0.5 1 10460 Trichloroethene 79-01-6 < 0.5 0.5 1 10460 Trichlorofluoromethane 75-69-4 < 0.5 0.5 1 10460 1,2,3-Trichloropropane 96-18-4 < 2.0 2.0 1 10460 1,2,4-Trimethylbenzene 95-63-6 < 0.5 0.5 1 10460 1,3,5-Trimethylbenzene 108-67-8 < 0.5 0.5 1 10460 Vinyl Chloride 75-01-4 < 0.5 0.5 1 10460 Xylene (Total) 1330-20-7 < 0.5 0.5 1 Sample Comments State of North Carolina Lab Certification No. 521 Laboratory Sample Analysis Record Analyst Dilution Factor Trial# Batch# Analysis Date and Time CAT No. Analysis Name Method 10460 VOCs- 25ml Water by 6200B SM 6200 B-1997 1 G183581AA 12/24/2018 11:18 Kevin A Sposito 1 01163 GC/MS VOA Water Prep SW-846 5030B 1 G183581AA 12/24/2018 11:17 Kevin A Sposito 1 Page 12 of 24 ExxonMobil c/o Arcadis ELLE Sample #: WW 9943007 ELLE Group #: 2019146 Matrix: Water Sample Description: Trip Blank Water EM# 99-GRE 615 West Friendly Ave - Greensboro, NC Project Name: 99-GRE - Greensboro, NC Collection Date/Time: 12/14/2018 Submittal Date/Time: 12/15/2018 10:40 Analysis Name CAT No. Dilution Factor CAS Number Result Limit of Quantitation SM 6200 B-1997 ug/l ug/l GC/MS Volatiles 10460 Benzene 71-43-2 < 0.5 0.5 1 10460 Bromobenzene 108-86-1 < 0.5 0.5 1 10460 Bromochloromethane 74-97-5 < 0.5 0.5 1 10460 Bromodichloromethane 75-27-4 < 0.5 0.5 1 10460 Bromoform 75-25-2 < 0.5 0.5 1 10460 Bromomethane 74-83-9 < 0.5 0.5 1 10460 n-Butylbenzene 104-51-8 < 0.5 0.5 1 10460 sec-Butylbenzene 135-98-8 < 0.5 0.5 1 10460 tert-Butylbenzene 98-06-6 < 0.5 0.5 1 10460 Carbon Tetrachloride 56-23-5 < 0.5 0.5 1 10460 Chlorobenzene 108-90-7 < 0.5 0.5 1 10460 Chloroethane 75-00-3 < 0.5 0.5 1 10460 Chloroform 67-66-3 < 0.5 0.5 1 10460 Chloromethane 74-87-3 < 0.8 0.8 1 10460 2-Chlorotoluene 95-49-8 < 0.5 0.5 1 10460 4-Chlorotoluene 106-43-4 < 0.5 0.5 1 10460 1,2-Dibromo-3-chloropropane 96-12-8 < 2.0 2.0 1 10460 Dibromochloromethane 124-48-1 < 0.5 0.5 1 10460 1,2-Dibromoethane 106-93-4 < 0.5 0.5 1 10460 Dibromomethane 74-95-3 < 0.5 0.5 1 10460 1,2-Dichlorobenzene 95-50-1 < 0.5 0.5 1 10460 1,3-Dichlorobenzene 541-73-1 < 0.5 0.5 1 10460 1,4-Dichlorobenzene 106-46-7 < 0.5 0.5 1 10460 Dichlorodifluoromethane 75-71-8 < 0.5 0.5 1 10460 1,1-Dichloroethane 75-34-3 < 0.5 0.5 1 10460 1,2-Dichloroethane 107-06-2 < 0.5 0.5 1 10460 1,1-Dichloroethene 75-35-4 < 0.5 0.5 1 10460 cis-1,2-Dichloroethene 156-59-2 < 0.5 0.5 1 10460 trans-1,2-Dichloroethene 156-60-5 < 0.5 0.5 1 10460 1,2-Dichloropropane 78-87-5 < 0.5 0.5 1 10460 1,3-Dichloropropane 142-28-9 < 0.5 0.5 1 10460 2,2-Dichloropropane 594-20-7 < 0.5 0.5 1 10460 1,1-Dichloropropene 563-58-6 < 0.5 0.5 1 10460 cis-1,3-Dichloropropene 10061-01-5 < 0.5 0.5 1 10460 trans-1,3-Dichloropropene 10061-02-6 < 0.5 0.5 1 10460 Ethanol 64-17-5 < 200 200 1 10460 Ethylbenzene 100-41-4 < 0.5 0.5 1 10460 Hexachlorobutadiene 87-68-3 < 0.5 0.5 1 10460 di-Isopropyl Ether 108-20-3 < 0.5 0.5 1 10460 Isopropylbenzene 98-82-8 < 0.5 0.5 1 10460 p-Isopropyltoluene 99-87-6 < 0.5 0.5 1 10460 Methyl Tertiary Butyl Ether 1634-04-4 < 0.5 0.5 1 10460 Methylene Chloride 75-09-2 < 0.8 0.8 1 10460 Naphthalene 91-20-3 < 0.5 0.5 1 10460 n-Propylbenzene 103-65-1 < 0.5 0.5 1 10460 Styrene 100-42-5 < 0.5 0.5 1 10460 1,1,1,2-Tetrachloroethane 630-20-6 < 0.5 0.5 1 10460 1,1,2,2-Tetrachloroethane 79-34-5 < 0.5 0.5 1 10460 Tetrachloroethene 127-18-4 < 0.5 0.5 1 Page 13 of 24 ExxonMobil c/o Arcadis ELLE Sample #: WW 9943007 ELLE Group #: 2019146 Matrix: Water Sample Description: Trip Blank Water EM# 99-GRE 615 West Friendly Ave - Greensboro, NC Project Name: 99-GRE - Greensboro, NC Collection Date/Time: 12/14/2018 Submittal Date/Time: 12/15/2018 10:40 Analysis Name CAT No. Dilution Factor CAS Number Result Limit of Quantitation SM 6200 B-1997 ug/l ug/l GC/MS Volatiles 10460 Toluene 108-88-3 < 0.5 0.5 1 10460 1,2,3-Trichlorobenzene 87-61-6 < 0.5 0.5 1 10460 1,2,4-Trichlorobenzene 120-82-1 < 0.5 0.5 1 10460 1,1,1-Trichloroethane 71-55-6 < 0.5 0.5 1 10460 1,1,2-Trichloroethane 79-00-5 < 0.5 0.5 1 10460 Trichloroethene 79-01-6 < 0.5 0.5 1 10460 Trichlorofluoromethane 75-69-4 < 0.5 0.5 1 10460 1,2,3-Trichloropropane 96-18-4 < 2.0 2.0 1 10460 1,2,4-Trimethylbenzene 95-63-6 < 0.5 0.5 1 10460 1,3,5-Trimethylbenzene 108-67-8 < 0.5 0.5 1 10460 Vinyl Chloride 75-01-4 < 0.5 0.5 1 10460 Xylene (Total) 1330-20-7 < 0.5 0.5 1 Sample Comments State of North Carolina Lab Certification No. 521 Laboratory Sample Analysis Record Analyst Dilution Factor Trial# Batch# Analysis Date and Time CAT No. Analysis Name Method 10460 VOCs- 25ml Water by 6200B SM 6200 B-1997 1 G183581AA 12/24/2018 10:54 Kevin A Sposito 1 01163 GC/MS VOA Water Prep SW-846 5030B 1 G183581AA 12/24/2018 10:53 Kevin A Sposito 1 Page 14 of 24 Quality Control Summary Group Number: 2019146 Client Name: ExxonMobil c/o Arcadis Reported: 12/26/2018 20:13 Matrix QC may not be reported if insufficient sample or site-specific QC samples were not submitted. In these situations, to demonstrate precision and accuracy at a batch level, a LCS/LCSD was performed, unless otherwise specified in the method. All Inorganic Initial Calibration and Continuing Calibration Blanks met acceptable method criteria unless otherwise noted on the Analysis Report. Method Blank Analysis Name Result LOQ ug/l ug/l Batch number: G183581AA Sample number(s): 9943002-9943007 0.5 < 0.5 Benzene 0.5 < 0.5 Bromobenzene 0.5 < 0.5 Bromochloromethane 0.5 < 0.5 Bromodichloromethane 0.5 < 0.5 Bromoform 0.5 < 0.5 Bromomethane 0.5 < 0.5 n-Butylbenzene 0.5 < 0.5 sec-Butylbenzene 0.5 < 0.5 tert-Butylbenzene 0.5 < 0.5 Carbon Tetrachloride 0.5 < 0.5 Chlorobenzene 0.5 < 0.5 Chloroethane 0.5 < 0.5 Chloroform 0.8 < 0.8 Chloromethane 0.5 < 0.5 2-Chlorotoluene 0.5 < 0.5 4-Chlorotoluene 2.0 < 2.0 1,2-Dibromo-3-chloropropane 0.5 < 0.5 Dibromochloromethane 0.5 < 0.5 1,2-Dibromoethane 0.5 < 0.5 Dibromomethane 0.5 < 0.5 1,2-Dichlorobenzene 0.5 < 0.5 1,3-Dichlorobenzene 0.5 < 0.5 1,4-Dichlorobenzene 0.5 < 0.5 Dichlorodifluoromethane 0.5 < 0.5 1,1-Dichloroethane 0.5 < 0.5 1,2-Dichloroethane 0.5 < 0.5 1,1-Dichloroethene 0.5 < 0.5 cis-1,2-Dichloroethene 0.5 < 0.5 trans-1,2-Dichloroethene 0.5 < 0.5 1,2-Dichloropropane 0.5 < 0.5 1,3-Dichloropropane 0.5 < 0.5 2,2-Dichloropropane 0.5 < 0.5 1,1-Dichloropropene 0.5 < 0.5 cis-1,3-Dichloropropene 0.5 < 0.5 trans-1,3-Dichloropropene 200 < 200 Ethanol 0.5 < 0.5 Ethylbenzene 0.5 < 0.5 Hexachlorobutadiene 0.5 < 0.5 di-Isopropyl Ether *- Outside of specification (1) The result for one or both determinations was less than five times the LOQ. (2) The unspiked result was more than four times the spike added. Page 15 of 24 Quality Control Summary Group Number: 2019146 Client Name: ExxonMobil c/o Arcadis Reported: 12/26/2018 20:13 Method Blank (continued) Analysis Name Result LOQ ug/l ug/l 0.5 < 0.5 Isopropylbenzene 0.5 < 0.5 p-Isopropyltoluene 0.5 < 0.5 Methyl Tertiary Butyl Ether 0.8 < 0.8 Methylene Chloride 0.5 < 0.5 Naphthalene 0.5 < 0.5 n-Propylbenzene 0.5 < 0.5 Styrene 0.5 < 0.5 1,1,1,2-Tetrachloroethane 0.5 < 0.5 1,1,2,2-Tetrachloroethane 0.5 < 0.5 Tetrachloroethene 0.5 < 0.5 Toluene 0.5 < 0.5 1,2,3-Trichlorobenzene 0.5 < 0.5 1,2,4-Trichlorobenzene 0.5 < 0.5 1,1,1-Trichloroethane 0.5 < 0.5 1,1,2-Trichloroethane 0.5 < 0.5 Trichloroethene 0.5 < 0.5 Trichlorofluoromethane 2.0 < 2.0 1,2,3-Trichloropropane 0.5 < 0.5 1,2,4-Trimethylbenzene 0.5 < 0.5 1,3,5-Trimethylbenzene 0.5 < 0.5 Vinyl Chloride 0.5 < 0.5 Xylene (Total) LCS/LCSD RPD Max LCS/LCSD Limits LCSD %REC LCS %REC LCSD Conc LCSD Spike Added LCS Conc LCS Spike Added RPD Analysis Name ug/l ug/l ug/l ug/l Batch number: G183581AA Sample number(s): 9943002-9943007 70-130 104 5.22 5.00 Benzene 70-130 106 5.28 5.00 Bromobenzene 70-130 117 5.84 5.00 Bromochloromethane 70-130 100 4.98 5.00 Bromodichloromethane 70-130 122 6.09 5.00 Bromoform 70-130 101 5.04 5.00 Bromomethane 70-130 104 5.22 5.00 n-Butylbenzene 70-130 104 5.22 5.00 sec-Butylbenzene 70-130 108 5.41 5.00 tert-Butylbenzene 70-130 88 4.40 5.00 Carbon Tetrachloride 70-130 108 5.38 5.00 Chlorobenzene 70-130 102 5.12 5.00 Chloroethane 70-130 101 5.06 5.00 Chloroform *- Outside of specification (1) The result for one or both determinations was less than five times the LOQ. (2) The unspiked result was more than four times the spike added. Page 16 of 24 Quality Control Summary Group Number: 2019146 Client Name: ExxonMobil c/o Arcadis Reported: 12/26/2018 20:13 LCS/LCSD (continued) RPD Max LCS/LCSD Limits LCSD %REC LCS %REC LCSD Conc LCSD Spike Added LCS Conc LCS Spike Added RPD Analysis Name ug/l ug/l ug/l ug/l 70-130 106 5.28 5.00 Chloromethane 70-130 107 5.34 5.00 2-Chlorotoluene 70-130 106 5.31 5.00 4-Chlorotoluene 70-130 105 5.24 5.00 1,2-Dibromo-3-chloropropane 70-130 105 5.27 5.00 Dibromochloromethane 70-130 107 5.36 5.00 1,2-Dibromoethane 70-130 107 5.36 5.00 Dibromomethane 70-130 105 5.24 5.00 1,2-Dichlorobenzene 70-130 104 5.22 5.00 1,3-Dichlorobenzene 70-130 104 5.18 5.00 1,4-Dichlorobenzene 70-130 115 5.75 5.00 Dichlorodifluoromethane 70-130 99 4.97 5.00 1,1-Dichloroethane 70-130 99 4.94 5.00 1,2-Dichloroethane 70-130 95 4.76 5.00 1,1-Dichloroethene 70-130 105 5.25 5.00 cis-1,2-Dichloroethene 70-130 97 4.84 5.00 trans-1,2-Dichloroethene 70-130 109 5.45 5.00 1,2-Dichloropropane 70-130 110 5.51 5.00 1,3-Dichloropropane 70-130 87 4.37 5.00 2,2-Dichloropropane 70-130 103 5.15 5.00 1,1-Dichloropropene 70-130 101 5.04 5.00 cis-1,3-Dichloropropene 70-130 96 4.81 5.00 trans-1,3-Dichloropropene 70-130 97 484.39 500 Ethanol 70-130 106 5.28 5.00 Ethylbenzene 70-130 101 5.06 5.00 Hexachlorobutadiene 70-130 101 5.04 5.00 di-Isopropyl Ether 70-130 106 5.28 5.00 Isopropylbenzene 70-130 105 5.25 5.00 p-Isopropyltoluene 70-130 101 5.06 5.00 Methyl Tertiary Butyl Ether 70-130 96 4.81 5.00 Methylene Chloride 70-130 104 5.18 5.00 Naphthalene 70-130 105 5.27 5.00 n-Propylbenzene 70-130 109 5.47 5.00 Styrene 70-130 97 4.86 5.00 1,1,1,2-Tetrachloroethane 70-130 111 5.57 5.00 1,1,2,2-Tetrachloroethane 70-130 105 5.25 5.00 Tetrachloroethene 70-130 106 5.30 5.00 Toluene 70-130 99 4.93 5.00 1,2,3-Trichlorobenzene 70-130 102 5.08 5.00 1,2,4-Trichlorobenzene 70-130 88 4.41 5.00 1,1,1-Trichloroethane 70-130 111 5.56 5.00 1,1,2-Trichloroethane 70-130 103 5.14 5.00 Trichloroethene 70-130 101 5.03 5.00 Trichlorofluoromethane 70-130 112 5.58 5.00 1,2,3-Trichloropropane *- Outside of specification (1) The result for one or both determinations was less than five times the LOQ. (2) The unspiked result was more than four times the spike added. Page 17 of 24 Quality Control Summary Group Number: 2019146 Client Name: ExxonMobil c/o Arcadis Reported: 12/26/2018 20:13 LCS/LCSD (continued) RPD Max LCS/LCSD Limits LCSD %REC LCS %REC LCSD Conc LCSD Spike Added LCS Conc LCS Spike Added RPD Analysis Name ug/l ug/l ug/l ug/l 70-130 104 5.21 5.00 1,2,4-Trimethylbenzene 70-130 104 5.21 5.00 1,3,5-Trimethylbenzene 70-130 106 5.28 5.00 Vinyl Chloride 70-130 109 16.35 15 Xylene (Total) MS/MSD Unspiked (UNSPK) = the sample used in conjunction with the matrix spike Analysis Name Unspiked Conc MS Spike Added MS Conc MSD Spike Added MSD Conc MS %Rec MSD %Rec MS/MSD Limits RPD RPD Max ug/l ug/l ug/l ug/l ug/l Batch number: G183581AA Sample number(s): 9943002-9943007 UNSPK: 9943002 500 8905.55 500 8500.5 Benzene 8862.63 72 (2) 70-130 0 30 81 (2) 500 541.69 500 < 50 Bromobenzene 541.17 108 70-130 0 30 108 500 523.76 500 < 50 Bromochloromethane 531.68 106 70-130 2 30 105 500 544.77 500 < 50 Bromodichloromethane 558.4 112 70-130 2 30 109 500 514.9 500 22.54 Bromoform 546.73 105 70-130 6 30 98 500 387.33 500 < 50 Bromomethane 383.34 77 70-130 1 30 77 500 542.17 500 < 50 n-Butylbenzene 546.75 109 70-130 1 30 108 500 542.88 500 < 50 sec-Butylbenzene 546.06 109 70-130 1 30 109 500 544.62 500 < 50 tert-Butylbenzene 566.85 113 70-130 4 30 109 500 436.43 500 < 50 Carbon Tetrachloride 462.96 93 70-130 6 30 87 500 545.03 500 < 50 Chlorobenzene 550.49 110 70-130 1 30 109 500 419.44 500 < 50 Chloroethane 431.32 86 70-130 3 30 84 500 543.25 500 < 50 Chloroform 556.81 111 70-130 2 30 109 500 399.17 500 < 80 Chloromethane 387.57 78 70-130 3 30 80 500 544.07 500 < 50 2-Chlorotoluene 552.47 110 70-130 2 30 109 500 543.85 500 < 50 4-Chlorotoluene 538.11 108 70-130 1 30 109 500 480.35 500 < 200 1,2-Dibromo-3-chloropropane 509.42 102 70-130 6 30 96 500 500.89 500 < 50 Dibromochloromethane 516.17 103 70-130 3 30 100 500 572.16 500 < 50 1,2-Dibromoethane 588.69 118 70-130 3 30 114 500 552.62 500 < 50 Dibromomethane 560.73 112 70-130 1 30 111 500 542.63 500 < 50 1,2-Dichlorobenzene 542.52 109 70-130 0 30 109 500 529.4 500 < 50 1,3-Dichlorobenzene 534 107 70-130 1 30 106 500 535.93 500 < 50 1,4-Dichlorobenzene 545.35 109 70-130 2 30 107 500 296.28 500 < 50 Dichlorodifluoromethane 289.41 58* 70-130 2 30 59* 500 507.85 500 < 50 1,1-Dichloroethane 514.2 103 70-130 1 30 102 500 524.17 500 < 50 1,2-Dichloroethane 511.12 102 70-130 3 30 105 500 529.01 500 < 50 1,1-Dichloroethene 535.88 107 70-130 1 30 106 500 548.99 500 < 50 cis-1,2-Dichloroethene 555.27 111 70-130 1 30 110 500 524.11 500 < 50 trans-1,2-Dichloroethene 534.13 107 70-130 2 30 105 *- Outside of specification (1) The result for one or both determinations was less than five times the LOQ. (2) The unspiked result was more than four times the spike added. Page 18 of 24 Quality Control Summary Group Number: 2019146 Client Name: ExxonMobil c/o Arcadis Reported: 12/26/2018 20:13 MS/MSD (continued) Unspiked (UNSPK) = the sample used in conjunction with the matrix spike Analysis Name Unspiked Conc MS Spike Added MS Conc MSD Spike Added MSD Conc MS %Rec MSD %Rec MS/MSD Limits RPD RPD Max ug/l ug/l ug/l ug/l ug/l 500 594.69 500 < 50 1,2-Dichloropropane 593.68 119 70-130 0 30 119 500 554.6 500 < 50 1,3-Dichloropropane 556.22 111 70-130 0 30 111 500 444.39 500 < 50 2,2-Dichloropropane 461.28 92 70-130 4 30 89 500 536.47 500 < 50 1,1-Dichloropropene 531.95 106 70-130 1 30 107 500 507.61 500 < 50 cis-1,3-Dichloropropene 509.44 102 70-130 0 30 102 500 455.6 500 < 50 trans-1,3-Dichloropropene 478.93 96 70-130 5 30 91 50000 46599.09 50000 < 20,000 Ethanol 42392.21 85 70-130 9 30 93 500 2040.35 500 1454.62 Ethylbenzene 2056.3 120 70-130 1 30 117 500 532.29 500 < 50 Hexachlorobutadiene 532.16 106 70-130 0 30 106 500 613.44 500 122.3 di-Isopropyl Ether 622.09 100 70-130 1 30 98 500 609.74 500 60.8 Isopropylbenzene 615.79 111 70-130 1 30 110 500 547.68 500 < 50 p-Isopropyltoluene 558.99 112 70-130 2 30 110 500 482.95 500 < 50 Methyl Tertiary Butyl Ether 495.39 99 70-130 3 30 97 500 526.05 500 < 80 Methylene Chloride 594.87 119 70-130 12 30 105 500 669.46 500 115.82 Naphthalene 690.71 115 70-130 3 30 111 500 658.41 500 100.98 n-Propylbenzene 664.04 113 70-130 1 30 111 500 645.89 500 99.65 Styrene 648.85 110 70-130 0 30 109 500 452.37 500 < 50 1,1,1,2-Tetrachloroethane 479.93 96 70-130 6 30 90 500 531.5 500 < 50 1,1,2,2-Tetrachloroethane 554.2 111 70-130 4 30 106 500 624.67 500 < 50 Tetrachloroethene 628.77 126 70-130 1 30 125 500 10235.89 500 9721.07 Toluene 10319.83 120 (2) 70-130 1 30 103 (2) 500 513.2 500 < 50 1,2,3-Trichlorobenzene 527.8 106 70-130 3 30 103 500 535.77 500 < 50 1,2,4-Trichlorobenzene 534.96 107 70-130 0 30 107 500 459.96 500 < 50 1,1,1-Trichloroethane 472.98 95 70-130 3 30 92 500 958.38 500 < 50 1,1,2-Trichloroethane 967.66 194* 70-130 1 30 192* 500 560.94 500 < 50 Trichloroethene 557.36 111 70-130 1 30 112 500 399.47 500 < 50 Trichlorofluoromethane 395.74 79 70-130 1 30 80 500 599.19 500 < 200 1,2,3-Trichloropropane 595.9 119 70-130 1 30 120 500 1567.69 500 930.47 1,2,4-Trimethylbenzene 1577.79 129 70-130 1 30 127 500 1206.23 500 594.15 1,3,5-Trimethylbenzene 1210.08 123 70-130 0 30 122 500 430.43 500 < 50 Vinyl Chloride 419.78 84 70-130 3 30 86 1500 10618.17 1500 8598.01 Xylene (Total) 10668.99 138 (2) 70-130 0 30 135 (2) *- Outside of specification (1) The result for one or both determinations was less than five times the LOQ. (2) The unspiked result was more than four times the spike added. Page 19 of 24 Quality Control Summary Group Number: 2019146 Client Name: ExxonMobil c/o Arcadis Reported: 12/26/2018 20:13 Surrogate Quality Control Surrogate recoveries which are outside of the QC window are confirmed unless attributed to dilution or otherwise noted on the Analysis Report. Analysis Name: VOCs- 25ml Water by 6200B Batch number: G183581AA Dibromofluoromethane 1,2-Dichloroethane-d4 Toluene-d8 4-Bromofluorobenzene 9943002 100 103 100 99 9943003 98 105 101 101 9943004 100 107 100 98 9943005 99 105 100 98 9943006 101 106 101 99 9943007 101 104 100 98 Blank 101 105 100 98 LCS 101 107 102 100 MS 99 102 102 100 MSD 99 104 102 101 Dibromofluoromethane 1,2-Dichloroethane-d4 Toluene-d8 4-Bromofluorobenzene Limits: 70-130 70-130 70-130 70-130 *- Outside of specification (1) The result for one or both determinations was less than five times the LOQ. (2) The unspiked result was more than four times the spike added. Page 20 of 24 Page 21 of 24 ArcadisClient: Sample Administration Receipt Documentation Log Doc Log ID:236323 Group Number(s): *236323* 2019146 State/Province of Origin: Delivery Method: Number of Packages: Delivery and Receipt Information 1 NC Fed Ex Arrival Timestamp: Number of Projects: 12/15/2018 10:40 1 Arrival Condition Summary Shipping Container Sealed:Yes Custody Seal Present:Yes Custody Seal Intact:Yes Samples Chilled:Yes Paperwork Enclosed:Yes Samples Intact:Yes Missing Samples:No Extra Samples:No Discrepancy in Container Qty on COC:No Sample IDs on COC match Containers:Yes Sample Date/Times match COC:Yes VOA Vial Headspace ≥ 6mm:No Total Trip Blank Qty:2 Trip Blank Type:HCl Air Quality Samples Present:No Unpacked by Melvin Sanchez (8943) at 11:21 on 12/15/2018 Samples Chilled Details Thermometer Types: DT = Digital (Temp. Bottle) IR = Infrared (Surface Temp) All Temperatures in °C. Cooler #Elevated Temp?Ice ContainerIce Present?Ice TypeTherm. TypeCorrected TempThermometer ID 1 DT42-02 0.7 DT Wet Y Bagged N Page 1 of 1 Page 22 of 24 Explanation of Symbols and Abbreviations 3768 0618 The following defines common symbols and abbreviations used in reporting technical data: BMQL Below Minimum Quantitation Level C degrees Celsius cfu colony forming units CP Units cobalt-chloroplatinate units F degrees Fahrenheit g gram(s) IU International Units kg kilogram(s) L liter(s) lb. pound(s) m3 cubic meter(s) meq milliequivalents mg milligram(s) mL milliliter(s) MPN Most Probable Number N.D. non-detect ng nanogram(s) NTU nephelometric turbidity units pg/L picogram/liter RL Reporting Limit TNTC Too Numerous To Count µg microgram(s) µL microliter(s) umhos/cm micromhos/cm MCL Maximum Contamination Limit < less than > greater than ppm parts per million - One ppm is equivalent to one milligram per kilogram (mg/kg) or one gram per million grams. For aqueous liquids, ppm is usually taken to be equivalent to milligrams per liter (mg/l), because one liter of water has a weight very close to a kilogram. For gases or vapors, one ppm is equivalent to one microliter per liter of gas. ppb parts per billion Dry weight Results printed under this heading have been adjusted for moisture content. This increases the analyte weight basis concentration to approximate the value present in a similar sample without moisture. All other results are reported on an as-received basis. Analytical test results meet all requirements of the associated regulatory program (i.e., NELAC (TNI), DoD, and ISO 17025) unless otherwise noted under the individual analysis. Measurement uncertainty values, as applicable, are available upon request. Tests results relate only to the sample tested. Clients should be aware that a critical step in a chemical or microbiological analysis is the collection of the sample. Unless the sample analyzed is truly representative of the bulk of material involved, the test results will be meaningless. If you have questions regarding the proper techniques of collecting samples, please contact us. We cannot be held responsible for sample integrity, however, unless sampling has been performed by a member of our staff. This report shall not be reproduced except in full, without the written approval of the laboratory. Times are local to the area of activity. Parameters listed in the 40 CFR Part 136 Table II as “analyze immediately” are not performed within 15 minutes. WARRANTY AND LIMITS OF LIABILITY - In accepting analytical work, we warrant the accuracy of test results for the sample as submitted. THE FOREGOING EXPRESS WARRANTY IS EXCLUSIVE AND IS GIVEN IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED OR IMPLIED. WE DISCLAIM ANY OTHER WARRANTIES, EXPRESSED OR IMPLIED, INCLUDING A WARRANTY OF FITNESS FOR PARTICULAR PURPOSE AND WARRANTY OF MERCHANTABILITY. IN NO EVENT SHALL EUROFINS LANCASTER LABORATORIES ENVIRONMENTAL, LLC BE LIABLE FOR INDIRECT, SPECIAL, CONSEQUENTIAL, OR INCIDENTAL DAMAGES INCLUDING, BUT NOT LIMITED TO, DAMAGES FOR LOSS OF PROFIT OR GOODWILL REGARDLESS OF (A) THE NEGLIGENCE (EITHER SOLE OR CONCURRENT) OF EUROFINS LANCASTER LABORATORIES ENVIRONMENTAL AND (B) WHETHER EUROFINS LANCASTER LABORATORIES ENVIRONMENTAL HAS BEEN INFORMED OF THE POSSIBILITY OF SUCH DAMAGES. We accept no legal responsibility for the purposes for which the client uses the test results. No purchase order or other order for work shall be accepted by Eurofins Lancaster Laboratories Environmental which includes any conditions that vary from the Standard Terms and Conditions, and Eurofins Lancaster Laboratories Environmental hereby objects to any conflicting terms contained in any acceptance or order submitted by client. Page 23 of 24 Data Qualifiers Qualifier Definition C Result confirmed by reanalysis D1 Indicates for dual column analyses that the result is reported from column 1 D2 Indicates for dual column analyses that the result is reported from column 2 E Concentration exceeds the calibration range K1 Initial Calibration Blank is above the QC limit and the sample result is ND K2 Continuing Calibration Blank is above the QC limit and the sample result is ND K3 Initial Calibration Verification is above the QC limit and the sample result is ND K4 Continuing Calibration Verification is above the QC limit and the sample result is ND J (or G, I, X)Estimated value >= the Method Detection Limit (MDL or DL) and < the Limit of Quantitation (LOQ or RL) P Concentration difference between the primary and confirmation column >40%. The lower result is reported. P^Concentration difference between the primary and confirmation column > 40%. The higher result is reported. U Analyte was not detected at the value indicated V Concentration difference between the primary and confirmation column >100%. The reporting limit is raised due to this disparity and evident interference. W The dissolved oxygen uptake for the unseeded blank is greater than 0.20 mg/L. Z Laboratory Defined - see analysis report Additional Organic and Inorganic CLP qualifiers may be used with Form 1 reports as defined by the CLP methods. Qualifiers specific to Dioxin/Furans and PCB Congeners are detailed on the individual Analysis Report. Page 24 of 24 APPENDIX B Notice of Intent (NOI) to Construct or Operate Injection Wells Application – May 21, 2018 Arcadis U.S., Inc. 111-D Sanders Lane Tel 919 854 1282 Fax 919 854 5448 www.arcadis.com Page: 1/2 Mr. Michael Rogers North Carolina Department of Environmental Quality Division of Water Quality – Aquifer Protection Section 1636 Mail Service Center Raleigh, North Carolina 27699-1636 Subject: Notification of Intent to Construct or Operate Injection Wells Former ExxonMobil Facility #99GRE 615 West Friendly Avenue Greensboro, Guilford County, North Carolina Incident No. 20030 Risk Classification: Intermediate Dear Mr. Rogers: On behalf of ExxonMobil Environmental Services Company (EMES), Arcadis G&M of North Carolina, Inc. (Arcadis) is submitting this Notification of Intent to Construct or Operate Injection Wells (Attachment A) to the North Carolina Department of Environmental Quality (NCDEQ) Division of Water Quality – Aquifer Protection Section at Former ExxonMobil Facility #99GRE located at 615 West Friendly Avenue in Greensboro, Guilford County, North Carolina. Arcadis is proposing to conduct a small-scale calcium peroxide injection (IXPER 75C) of less than 10,000 square feet at the Site to reduce dissolved-phase chemicals of concern (COCs) to concentrations below the applicable North Carolina Gross Contaminant Levels (GCLs) for Groundwater. Please contact Scott Bostian at (919) 415-2291 or me at (919) 415-2327 with any questions or concerns related to the proposed calcium peroxide injection or this incident number. Sincerely, Arcadis G&M of North Carolina, Inc. Paul Goodell, E.I. AFS Project Manager 5 ENVIRONMENT Date: May 21, 2018 Contact: Paul Goodell Phone: 919.415.2327 Email: Paul.Goodell@Arcadis.com Our ref: B0085851.0048 arcadis.com Mr. Michael Rogers May 21, 2018 Page: 2/2 Copies: Ms. Calista Campbell - EMES File – EM #99GRE Deemed Permitted GW Remediation NOI Rev. 6/1/2017 Page 1 North Carolina Department of Environmental Quality – Division of Water Resources Print Clearly or Type Information. Illegible Submittals Will Be Returned As Incomplete. DATE: , 20____ PERMIT NO. (to be filled in by DWR) A. WELL TYPE TO BE CONSTRUCTED OR OPERATED (1) Air Injection Well……………………………..…Complete sections B through F, K, N (2) Aquifer Test Well……………………….………..Complete sections B through F, K, N (3) Passive Injection System…………………..……..Complete sections B through F, H-N (4) X Small-Scale Injection Operation………………….Complete sections B through N (5) Pilot Test………………………………………….Complete sections B through N (6) Tracer Injection Well………………………….….Complete sections B through N B. STATUS OF WELL OWNER: Business/Organization C. WELL OWNER(S) – State name of Business/Agency, and Name and Title of person delegated authority to sign on behalf of the business or agency: Name(s): Calista Campbell (Project Manager; ExxonMobil Environmental Services Company Address: 1900 E. Linden Avenue, Building 28A City: Linden State: _NJ_ Zip Code: 07036 County: Union Day Tele No.: 908.335.1219 Cell No.: 201.341.4687 EMAIL Address:__Calista.Campbell1@exxonmobil.com_ Fax No.: NA NOTIFICATION OF INTENT (NOI) TO CONSTRUCT OR OPERATE INJECTION WELLS The following are “permitted by rule” and do not require an individual permit when constructed in accordance with the rules of 15A NCAC 02C .0200. This form shall be submitted at least 2 WEEKS prior to injection. AQUIFER TEST WELLS (15A NCAC 02C .0220) These wells are used to inject uncontaminated fluid into an aquifer to determine aquifer hydraulic characteristics. IN SITU REMEDIATION (15A NCAC 02C .0225) or TRACER WELLS (15A NCAC 02C .0229): 1) Passive Injection Systems - In-well delivery systems to diffuse injectants into the subsurface. Examples include ORC socks, iSOC systems, and other gas infusion methods (Note: Injection Event Records (IER) do not need to be submitted for replacement of each sock used in ORC systems). 2) Small-Scale Injection Operations – Injection wells located within a land surface area not to exceed 10,000 square feet for the purpose of soil or groundwater remediation or tracer tests. An individual permit shall be required for test or treatment areas exceeding 10,000 square feet. 3) Pilot Tests - Preliminary studies conducted for the purpose of evaluating the technical feasibility of a remediation strategy in order to develop a full scale remediation plan for future implementation, and where the surface area of the injection zone wells are located within an area that does not exceed five percent of the land surface above the known extent of groundwater contamination. An individual permit shall be required to conduct more than one pilot test on any separate groundwater contaminant plume. 4) Air Injection Wells - Used to inject ambient air to enhance in-situ treatment of soil or groundwater. WI0400492 Deemed Permitted GW Remediation NOI Rev. 6/1/2017 Page 2 D. PROPERTY OWNER(S) (if different than well owner) Name and Title: Trip Brown (Property Contact) Company Name Bach, LLC Mailing Address: 440 West Market Street City: Greensboro State: _NC_ Zip Code: 27401 County: Guilford Day Tele No.: 336.541.5532 Cell No.: NA EMAIL Address: tripbrown@bipinc.com Fax No.: E. PROJECT CONTACT (Typically Environmental Engineering Firm) Name and Title: Paul Goodell (Project Manager) Company Name Arcadis G&M of North Carolina, Inc. Mailing Address: 801 Corporate Center Dr. Suite 300 City: Raleigh State: NC_ Zip Code: 27607 County: Wake Day Tele No.: 919.415.2327 Cell No.: 845.857.4270 EMAIL Address: paul.goodell@arcadis.com Fax No.: 919.854.5448 F. PHYSICAL LOCATION OF WELL SITE (1) Facility Name & Address: Former ExxonMobil Service Station #99GRE 615 West Friendly Avenue (See Figure 1 for site location map) City: Greensboro County: Guilford Zip Code: 27410 (2) Geographic Coordinates: Latitude**: o ′ ″ or 36 o.073055 Longitude**: o ′ ″ or 79 o.797491 Reference Datum: WGS84 Accuracy: Method of Collection: Google Maps **FOR AIR INJECTION AND AQUIFER TEST WELLS ONLY: A FACILITY SITE MAP WITH PROPERTY BOUNDARIES MAY BE SUBMITTED IN LIEU OF GEOGRAPHIC COORDINATES. G. TREATMENT AREA Land surface area of contaminant plume: 12275 square feet Land surface area of inj. well network: 1400 square feet (< 10,000 ft2 for small-scale injections) Percent of contaminant plume area to be treated: 11.4% (must be < 5% of plume for pilot test injections) H. INJECTION ZONE MAPS – Attach the following to the notification. (1) Contaminant plume map(s) with isoconcentration lines that show the horizontal extent of the contaminant plume in soil and groundwater, existing and proposed monitoring wells, and existing and proposed injection wells (Figure 2); and (2) Cross-section(s) to the known or projected depth of contamination that show the horizontal and vertical extent of the contaminant plume in soil and groundwater, changes in lithology, existing and proposed monitoring wells, and existing and proposed injection wells (Figure 3, Figure 4, Figure 5). (3) Potentiometric surface map(s) indicating the rate and direction of groundwater movement, plus existing and proposed wells (Figure 6). Deemed Permitted GW Remediation NOI Rev. 6/1/2017 Page 3 I. DESCRIPTION OF PROPOSED INJECTION ACTIVITIES – Provide a brief narrative regarding the purpose, scope, and goals of the proposed injection activity. This should include the rate, volume, and duration of injection over time. An injection program will be performed to help promote expedited in situ biodegradation of constituents of concern (COCs) in groundwater. The primary COC that will be targeted is benzene which remains above the North Carolina Gross Contamination Levels (GCLs) in the groundwater sample collected in August 2016. A calcium peroxide injection solution (IXPER 75C) will be used to increase dissolved oxygen and stimulate aerobic biodegradation within the plume. A site map presenting the approximate extent of benzene is depicted on Figure 2. Figure 2 also presents the approximate locations of the proposed calcium peroxide injections. The injection event is expected to take place over 2 weeks. Two additional injection events, similar in scope to the initial event, may be performed to replenish the subsurface with substrate concentrations as necessary. Temporary injection points will be used to provide the flexibility to adjust locations between events (e.g. to prevent preferential flow paths or to allow more optimal distribution to the target treatment area). Following is a summary of the planned calcium peroxide injection program. Calcium Peroxide Injection Program The initial calcium peroxide injections will be performed by batch mixing IXPER 75C with potable water to form a slurry that will then be injected using direct push technology (DPT) injection methods. The initial event will utilize up to 35% by weight IXPER 75C slurry that will be injected into up to 40 temporary DPT locations using bottom up DPT injection methods. Note that the current plan accounts for 14 points, but additional points have been included to account for variable injection conditions in the saprolite. Because the DPT injection methods introduce the slurry to the formation through a pressure activated tip on the drill rods (rather than through an injection well screen), the slurry will need to be injected in a series of 2-ft lifts at each location to cover the interval extending from approximately 10 to 16 feet below ground surface (ft bgs), approximately 3 lifts per locations. Boreholes will be abandoned immediately following the injection event. Following is a summary of the key parameters for the calcium peroxide injection program: • Target injection volume: 2100 gallons of slurry per event (150 gallons per point / 50 gallons per lift) • Target weight of calcium peroxide: 5250 pounds of IXPER 75C per event (375 pounds per point / 125 pounds per lift) • Maximum injection concentration: 35% IXPER 75C by weight • Maximum injection flow rate: 30 gallons per minute (gpm) • Maximum injection pressure: 80 pounds per square inch (psi) gauge. Note injection pressures will be kept to the minimum required to sustain flow • Target depth interval for treatment: 10 to 16 ft bgs • Target radius of influence: 5 feet (additional injection locations may be required if a 5-ft ROI is not feasible due to the local lithology conditions) The scope of the second and third events (if necessary) are anticipated to be similar in scope to the first injection event. However, performance monitoring data collected following the first injection event may be utilized to adjust locations and injection solution concentrations as necessary. Deemed Permitted GW Remediation NOI Rev. 6/1/2017 Page 4 J. APPROVED INJECTANTS – Provide a MSDS for each injectant. Attach additional sheets if necessary. NOTE: Only injectants approved by the NC Division of Public Health, Department of Health and Human Services can be injected. Approved injectants can be found online at http://deq.nc.gov/about/divisions/water- resources/water-resources-permits/wastewater-branch/ground-water-protection/ground-water-approved-injectants. All other substances must be reviewed by the DHHS prior to use. Contact the UIC Program for more info (919-807-6496). Injectant: Calcium Peroxide (IXPER 75C) mixed with Potable Water (SDS in Attachment 1) Volume of injectant: Up to 2100 gallons (150 gallons per injection point) Concentration at point of injection: Up to 35% IXPER 75C by weight Percent if in a mixture with other injectants: NA Injectant: Volume of injectant: Concentration at point of injection: Percent if in a mixture with other injectants: Injectant: Volume of injectant: Concentration at point of injection: Percent if in a mixture with other injectants: K. WELL CONSTRUCTION DATA (1) Number of injection wells: Up to 40 temporary DPT injection points Proposed NA Existing (provide GW-1s) (2) For Proposed wells or Existing wells not having GW-1s, provide well construction details for each injection well in a diagram or table format. A single diagram or line in a table can be used for multiple wells with the same construction details. Well construction details shall include the following (indicate if construction is proposed or as-built): (a) Well type as permanent, Geoprobe/DPT, or subsurface distribution infiltration gallery (b) Depth below land surface of casing, each grout type and depth, screen, and sand pack (c) Well contractor name and certification number Table 1 and Figure 7 provide a summary of the planned construction details for the temporary DPT points.___ The wells and DPT points will be installed by Parratt Wolf, Inc. (NC Well Contractor Certification Number 3371-A). _________________________________________________________________________________ L. SCHEDULES – Briefly describe the schedule for well construction and injection activities. The injection event is tentatively scheduled for July 2018. The temporary DPT injection points for the calcium peroxide injections will be installed during the injection event. It is anticipated the full injection event will take up to 2 weeks complete. The DPT boreholes will be abandoned immediately upon completion of the injection Deemed Permitted GW Remediation NOI Rev. 6/1/2017 Page 5 event. An injection event record will be submitted to NCDEQ Division of Water Resources within 30 days of completing the injection event. ______ M. MONITORING PLAN – Describe below or in separate attachment a monitoring plan to be used to determine if violations of groundwater quality standards specified in Subchapter 02L result from the injection activity. Following the injection event, groundwater samples will be collected via bailers from the monitoring well locations within the injection area (MW-1R and MW-9) and monitored for field parameters (pH, redox potential [ORP], conductivity, temperature, and dissolved oxygen [DO]) to assess delivery of injection fluid. A quarterly post-injection groundwater monitoring program will be implemented for the Site and includes the collection of groundwater samples for laboratory analysis of volatile organic compounds (VOCs) by Standard Method 6200B and field parameters (pH, ORP, conductivity, temperature, and DO) from 5 site monitoring wells. A summary of the post-injection monitoring program is provided in Table 2. Monitoring well locations are shown on Figure 2. _________________________________________ N. SIGNATURE OF APPLICANT AND PROPERTY OWNER APPLICANT: “I hereby certify, under penalty of law, that I am familiar with the information submitted in this document and all attachments thereto and that, based on my inquiry of those individuals immediately responsible for obtaining said information, I believe that the information is true, accurate and complete. I am aware that there are significant penalties, including the possibility of fines and imprisonment, for submitting false information. I agree to construct, operate, maintain, repair, and if applicable, abandon the injection well and all related appurtenances in accordance with the 15A NCAC 02C 0200 Rules.” Signature of Applicant Print or Type Full Name and Title PROPERTY OWNER (if the property is not owned by the permit applicant): “As owner of the property on which the injection well(s) are to be constructed and operated, I hereby consent to allow the applicant to construct each injection well as outlined in this application and agree that it shall be the responsibility of the applicant to ensure that the injection well(s) conform to the Well Construction Standards (15A NCAC 02C .0200).” “Owner” means any person who holds the fee or other property rights in the well being constructed. A well is real property and its construction on land shall be deemed to vest ownership in the land owner, in the absence of contrary agreement in writing. Signature* of Property Owner (if different from applicant) Print or Type Full Name and Title *An access agreement between the applicant and property owner may be submitted in lieu of a signature on this form. Submit the completed notification package to: DWR – UIC Program 1636 Mail Service Center Raleigh, NC 27699-1636 Telephone: (919) 807-6464 Table 1 Injection Well Construction Details Former ExxonMobil Facility #99-GRE Greensboro, North Carolina Well Type Well Status Number of Wells/Points1 Total Depth (ft bgs) Screen/Injection Interval (ft bgs) Sand Pack Interval (ft bgs) Well Construction Materials Temporary DPT Injection Points Proposed/Planned 14 Temporary DPT Points per Event 16 10-16 NA Injection through DPT Rods and Pressure Activated Tip Notes: 1. Up to three injection events may be performed. ft bgs = feet below ground sruface DPT = direct push technology 1/1 Table 2Quarterly Performance Monitoring ProgramFormer ExxonMobil Facility #99-GREGreensboro, North CarolinaMonitoring Well VOCs(SM 6200B)pH ORP DO Turbidity Temperature Specific ConductanceMW-DW1 L F FFF F FMW-1R L F FFF F FMW-4 L F FFF F FMW-6 L F FFF F FMW-9 L F FFF F FDUP1 L --- --- --- --- --- ---TB L --- --- --- --- --- ---Notes:VOCs Volatile Organic CompoundsORP Oxidation-Reduction Potential.DO Dissolved Oxygen.QA/QC Quality Assurance/Quality Control.--- Not collectedF Field analysis using a water quality meter.L Laboratory Analysis.Monitoring well locations shown on Figure 2Quarterly Performance Monitoring1/1 DIRECT PUSH INJECTION CONFIGURATION FOR CALCIUMPEROXIDE INJECTIONS FIGURE7 FORMER EXXONMOBIL FACILITY #99-GRE,615 WEST FRIENDLY AVENUEGREENSBORO, NORTH CAROLINA ~ 500 GALLON MIXING TANK UP TO 35% CALCIUM PEROXIDE IN WATER TRANSFER PUMP TRUCK/TRACKED MOUNTED DIRECT PUSH DRILLING RIG WITH INJECTION PUMP GROUND SURFACE 2-INCH PRESSURE ACTIVATED INJECTION TIP ~10 FT BGS TARGET INJECTION INTERVAL ~16 FT BGS 07/29/2015 SYRACUSE, NY-ENV/CAD-DJHOWES GP12MAFB/CY14/NB042/CDR/2MAFBG01.CDR MIXER NOT TO SCALE SAFETY DATA SHEET IXPER® 75C Calcium Peroxide Revision Date 04/20/2015 P00000020642 Version : 1.03 / CA ( Z8 ) 1 /14 SECTION 1: Identification of the substance/mixture and of the company/undertaking 1.1 Product identifier -Trade name IXPER®75C Calcium Peroxide -Molecular formula CaO2 1.2 Relevant identified uses of the substance or mixture and uses advised against Uses of the Substance / Mixture -Oil & gas industry -Oxidizing Agents 1.3 Details of the supplier of the safety data sheet Company SOLVAY CHEMICALS, INC. 3333 RICHMOND AVENUE 77098-3099, HOUSTON USA Tel: +1-800-7658292; +1-713-5256800 Fax: +1-713-5257804 Prepared by Solvay Product Stewardship (see Telephone number above) Date Prepared 04/20/2015 1.4 Emergency telephone FOR EMERGENCIES INVOLVING A SPILL, LEAK, FIRE, EXPOSURE OR ACCIDENT CONTACT: CHEMTREC 800-424- 9300 within the United States and Canada, or 703-527-3887 for international collect calls. SECTION 2: Hazards identification 2.1 Emergency overview Appearance Form :powder Physical state:solid Color:light yellow Odor:odorless Warning statements -Oxidizing -Contact with combustible material may cause fire. -Irritating to respiratory system and skin. -Risk of serious damage to eyes. 2.2 Potential Health Effects SAFETY DATA SHEET IXPER® 75C Calcium Peroxide Revision Date 04/20/2015 P00000020642 Version : 1.03 / CA ( Z8 ) 2 /14 Inhalation effect -Inhalation of dust may cause shortness of breath, tightness of the chest, a sore throat and cough. -irritation of the upper respiratory tract -Irritating to mucous membranes -Nose bleeding Skin effect -no data available Eye effect -no data available Ingestion effect -no data available Chronic effects -This product does not contain any ingredient designated by IARC or ACGIH as probable or suspected human carcinogens. SECTION 3: Composition/information on ingredients -Chemical nature Reaction mass 3.1 Information on Components and Impurities WHMIS Hazardous Ingredients and Impurities Chemical Name Identification number CAS-No.Concentration [%] Calcium peroxide 1305-79-9 70 -80 Calcium hydroxide (Ca(OH)2) 1305-62-0 15 -20 Sodium silicate SiO2/Na2O 1344-09-8 1 -5 SECTION 4: First aid measures 4.1 Description of first-aid measures In case of inhalation -Move to fresh air. -If symptoms persist, call a physician. In case of skin contact -Remove and wash contaminated clothing before re-use. -Wash off with soap and water. -If symptoms persist, call a physician. In case of eye contact -Call a physician or poison control center immediately. -In case of eye contact, remove contact lens and rinse immediately with plenty of water, also under the eyelids, for at least 15 minutes. SAFETY DATA SHEET IXPER® 75C Calcium Peroxide Revision Date 04/20/2015 P00000020642 Version : 1.03 / CA ( Z8 ) 3 /14 -In the case of difficulty of opening the lids, administer an analgesic eye wash (oxybuprocaine). In case of ingestion -Rinse mouth with water. -Do NOT induce vomiting. -If accidentally swallowed obtain immediate medical attention. -Oxygen or artificial respiration if needed. 4.2 Most important symptoms and effects, both acute and delayed -no data available 4.3 Indication of any immediate medical attention and special treatment needed Notes to physician -Immediate medical attention is required. SECTION 5: Firefighting measures Flash point Not applicable Autoignition temperature The substance or mixture is not classified as self heating. Flammability / Explosive limit no data available 5.1 Extinguishing media Suitable extinguishing media -Water -Water spray Unsuitable extinguishing media -None. 5.2 Special hazards arising from the substance or mixture Specific hazards during fire fighting -Oxidizing -Oxygen released in thermal decomposition may support combustion -Contact with combustible material may cause fire. -Contact with flammables may cause fire or explosions. -Risk of explosion if heated under confinement. Hazardous combustion products: -Oxygen 5.3 Advice for firefighters Special protective equipment for fire-fighters -In the event of fire, wear self-contained breathing apparatus. -Use personal protective equipment. -Cool containers/tanks with water spray. SAFETY DATA SHEET IXPER® 75C Calcium Peroxide Revision Date 04/20/2015 P00000020642 Version : 1.03 / CA ( Z8 ) 4 /14 SECTION 6: Accidental release measures 6.1 Personal precautions, protective equipment and emergency procedures Advice for non-emergency personnel -Keep away from incompatible products Advice for emergency responders -Sweep up to prevent slipping hazard. 6.2 Environmental precautions -Should not be released into the environment. -Limited quantity -Flush into sewer with plenty of water. -Large quantities: -If the product contaminates rivers and lakes or drains inform respective authorities. 6.3 Methods and materials for containment and cleaning up -Sweep up and shovel into suitable containers for disposal. -Do not mix waste streams during collection. -Avoid dust formation. -Treat recovered material as described in the section "Disposal considerations". -All receiving equipment should be clean, vented, dry, labeled and made of material that is compatible with the product. -Never return spills in original containers for re-use. 6.4 Reference to other sections -Refer to protective measures listed in sections 7 and 8. SECTION 7: Handling and storage 7.1 Precautions for safe handling -Avoid dust formation. -Ensure adequate ventilation. -Keep away from heat and sources of ignition. -Use only clean and dry utensils. -Never return unused material to storage receptacle. Hygiene measures -When using do not eat, drink or smoke. -Wash hands before breaks and at the end of workday. -Handle in accordance with good industrial hygiene and safety practice. -Do not ingest. -Eye wash bottles or eye wash stations in compliance with applicable standards. 7.2 Conditions for safe storage, including any incompatibilities Packaging material Suitable material -Stainless steel -Plastic materials. -Carton + Polyethylene SAFETY DATA SHEET IXPER® 75C Calcium Peroxide Revision Date 04/20/2015 P00000020642 Version : 1.03 / CA ( Z8 ) 5 /14 Unsuitable material -no data available 7.3 Specific end use(s) -no data available SECTION 8: Exposure controls/personal protection Introductory Remarks: These recommendations provide general guidance for handling this product. Because specific work environments and material handling practices vary, safety procedures should be developed for each intended application. Assistance with selection, use and maintenance of worker protection equipment is generally available from equipment manufacturers. 8.1 Control parameters Components with workplace occupational exposure limits Consult local authorities for acceptable exposure limits. Ingredients Value type Value Basis Calcium peroxide TWA 3 mg/m3 Solvay Acceptable Exposure Limit Calcium hydroxide (Ca(OH)2)TWA 5 mg/m3 American Conference of Governmental Industrial Hygienists Upper Respiratory Tract irritation, Eye irritation, Skin irritation 8.2 Exposure controls Control measures Engineering measures -Provide appropriate exhaust ventilation at places where dust is formed. -Apply technical measures to comply with the occupational exposure limits. Individual protection measures Respiratory protection -Use only respiratory protection that conforms to international/ national standards. -Use NIOSH approved respiratory protection. -Effective dust mask Hand protection -Wear suitable gloves. Suitable material -PVC -Neoprene -Natural Rubber Eye protection -Goggles Skin and body protection -Dust impervious protective suit Hygiene measures -When using do not eat, drink or smoke. SAFETY DATA SHEET IXPER® 75C Calcium Peroxide Revision Date 04/20/2015 P00000020642 Version : 1.03 / CA ( Z8 ) 6 /14 -Wash hands before breaks and at the end of workday. -Handle in accordance with good industrial hygiene and safety practice. -Do not ingest. -Eye wash bottles or eye wash stations in compliance with applicable standards. SECTION 9: Physical and chemical properties Physical and Chemical properties here represent typical properties of this product. Contact the business area using the Product information phone number in Section 1 for its exact specifications. 9.1 Information on basic physical and chemical properties Appearance Form: powder Physical state:solid Color: light yellow Particle size 2.125 µm d 10 11.346 µm d 50 31.939 µm d 90 Odor odorless Odor Threshold no data available pH 11.7 (10 g/l)(68 °F (20 °C)) saturated aqueous solution pKa:11.6 Hydrogen peroxide < 0.0 (77 °F (25 °C)) Calcium hydroxide Melting point/range 527 °F (275 °C) Decomposition: yes Boiling point/boiling range Thermal decomposition: yes Flash point Not applicable Evaporation rate (Butylacetate = 1)no data available Flammability (solid, gas)The product is not flammable. Flammability / Explosive limit Explosiveness: Not explosive Autoignition temperature The substance or mixture is not classified as self heating. Vapor pressure Not applicable SAFETY DATA SHEET IXPER® 75C Calcium Peroxide Revision Date 04/20/2015 P00000020642 Version : 1.03 / CA ( Z8 ) 7 /14 Vapor density Not applicable Density Bulk density: 450 -550 kg/m3 Relative density: 2.81 ( 68 °F (20 °C)) Solubility Water solubility : 1.65 g/l ( 68 °F (20 °C)) Calcium hydroxide Decomposes in contact with water. Partition coefficient: n-octanol/water Not applicable Thermal decomposition > 527 °F (> 275 °C) Viscosity Viscosity, dynamic : Not applicable Explosive properties no data available Oxidizing properties The substance or mixture is classified as oxidizing with the category 1. Oxidizing 9.2 Other information Molecular weight 72.1 g/mol SECTION 10: Stability and reactivity 10.1 Reactivity -Decomposes when moist. -Decomposes on heating. 10.2 Chemical stability -Stable under recommended storage conditions. -Potential for exothermic hazard 10.3 Possibility of hazardous reactions -Contact with combustible material may cause fire., Contact with flammables may cause fire or explosions., Risk of explosion if heated under confinement., Fire or intense heat may cause violent rupture of packages. 10.4 Conditions to avoid -Exposure to moisture. -To avoid thermal decomposition, do not overheat. 10.5 Incompatible materials SAFETY DATA SHEET IXPER® 75C Calcium Peroxide Revision Date 04/20/2015 P00000020642 Version : 1.03 / CA ( Z8 ) 8 /14 -Water -Acids -Bases -Heavy metal salts -Reducing agents -Organic materials -Flammable materials -Combustible material 10.6 Hazardous decomposition products -Oxygen SECTION 11: Toxicological information 11.1 Information on toxicological effects Acute toxicity Acute oral toxicity LD50 : > 5,000 mg/kg -Rat Acute inhalation toxicity no data available Acute dermal toxicity LD50 > 2,000 mg/kg -Rat Acute toxicity (other routes of administration) no data available Skin corrosion/irritation Rabbit No skin irritation Serious eye damage/eye irritation Rabbit Risk of serious damage to eyes. Respiratory or skin sensitization Does not cause skin sensitization. Guinea pig Did not cause sensitization on laboratory animals. Mutagenicity Genotoxicity in vitro In vitro tests showed mutagenic effects Genotoxicity in vivo Animal testing did not show any mutagenic effects. In vivo tests did not show mutagenic effects SAFETY DATA SHEET IXPER® 75C Calcium Peroxide Revision Date 04/20/2015 P00000020642 Version : 1.03 / CA ( Z8 ) 9 /14 Carcinogenicity Mouse Oral Exposure time: Prolonged exposure Target Organs: duodenum carcinogenic effects Mouse Dermal Exposure time: Prolonged exposure Animal testing did not show any carcinogenic effects. This product does not contain any ingredient designated as probable or suspected human carcinogens by: IARC ACGIH Toxicity for reproduction and development Toxicity to reproduction / fertility No toxicity to reproduction Developmental Toxicity/Teratogenicity no data available STOT STOT-single exposure Routes of exposure: Inhalation May cause respiratory irritation. H2O2 50 % RD 50 : 665 mg/m3 -Mouse Test substance:H2O2 50 % STOT-repeated exposure Oral 90-day -Mouse LOAEL: 300 ppm Target Organs:Gastrointestinal tract Oral 90-day -Mouse NOAEL: 100 ppm Inhalation 28-day -Rat LOAEL: 10 ppm Target Organs:Respiratory system Inhalation 28-day -Rat NOAEL: 2 ppm Aspiration toxicity no data available SAFETY DATA SHEET IXPER® 75C Calcium Peroxide Revision Date 04/20/2015 P00000020642 Version : 1.03 / CA ( Z8 ) 10/14 SECTION 12: Ecological information 12.1 Toxicity Aquatic Compartment Acute toxicity to fish LC50 -96 h : 16.4 mg/l -Pimephales promelas (fathead minnow) NOEC -96 h : 4.3 mg/l -Pimephales promelas (fathead minnow) Acute toxicity to daphnia and other aquatic invertebrates. EC50 -48 h : 6.8 mg/l -Daphnia magna (Water flea) semi-static test Fresh water Toxicity to aquatic plants EC50 -72 h : 2.6 mg/l -Skeletonema costatum (marine diatom) Growth rate NOEC -72 h : 0.63 mg/l -Skeletonema costatum (marine diatom) Chronic toxicity to daphnia and other aquatic invertebrates. NOEC: 0.63 mg/l -21 Days -Daphnia magna (Water flea) Reproduction Test 12.2 Persistence and degradability Abiotic degradation Photodegradation Not applicable Medium Air complexation/precipitation of inorganic materials Medium Water Soil hydrolyzes Medium Water Biodegradation Biodegradability The methods for determining biodegradability are not applicable to inorganic substances. 12.3 Bioaccumulative potential Bioconcentration factor (BCF)Not applicable SAFETY DATA SHEET IXPER® 75C Calcium Peroxide Revision Date 04/20/2015 P00000020642 Version : 1.03 / CA ( Z8 ) 11/14 12.4 Mobility in soil Adsorption potential (Koc)Air Not applicable Water low solubility and mobility Soil/sediments 12.5 Results of PBT and vPvB assessment no data available 12.6 Other adverse effects no data available SECTION 13: Disposal considerations 13.1 Waste treatment methods Product Disposal -Dilute with plenty of water. -Dispose of wastes in an approved waste disposal facility. -Can be landfilled, when in compliance with local regulations. -In accordance with local and national regulations. Advice on cleaning and disposal of packaging -Clean container with water. -Empty containers should be taken to an approved waste handling site for recycling or disposal. -Uncleaned empty packaging -Dispose of as unused product. -In accordance with local and national regulations. SECTION 14: Transport information Transportation status: IMPORTANT! Statements below provide additional data on listed transport classification. The listed Transportation Classification does not address regulatory variations due to changes in package size, mode of shipment or other regulatory descriptors. TDG 14.1 UN number UN 1457 14.2 Proper shipping name CALCIUM PEROXIDE 14.3 Transport hazard class 5.1 Label(s)5.1 14.4 Packing group Packing group II ERG No 140 14.5 Environmental hazards Marine pollutant NO SAFETY DATA SHEET IXPER® 75C Calcium Peroxide Revision Date 04/20/2015 P00000020642 Version : 1.03 / CA ( Z8 ) 12/14 DOT 14.1 UN number UN 1457 14.2 Proper shipping name CALCIUM PEROXIDE 14.3 Transport hazard class 5.1 Label(s)5.1 14.4 Packing group Packing group II ERG No 140 14.5 Environmental hazards Marine pollutant NO NOM no data available IMDG 14.1 UN number UN 1457 14.2 Proper shipping name CALCIUM PEROXIDE 14.3 Transport hazard class 5.1 Label(s)5.1 14.4 Packing group Packing group II 14.5 Environmental hazards Marine pollutant NO 14.6 Special precautions for user EmS F-G , S-Q For personal protection see section 8. SAFETY DATA SHEET IXPER® 75C Calcium Peroxide Revision Date 04/20/2015 P00000020642 Version : 1.03 / CA ( Z8 ) 13/14 IATA 14.1 UN number UN 1457 14.2 Proper shipping name CALCIUM PEROXIDE 14.3 Transport hazard class 5.1 Label(s):5.1 14.4 Packing group Packing group II Packing instruction (cargo aircraft)562 Max net qty / pkg 25.00 kg Packing instruction (passenger aircraft)558 Max net qty / pkg 5.00 kg 14.5 Environmental hazards NO 14.6 Special precautions for user For personal protection see section 8. Note: The above regulatory prescriptions are those valid on the date of publication of this sheet. Given the possible evolution of transportation regulations for hazardous materials, it would be advisable to check their validity with your sales office. SECTION 15: Regulatory information 15.1Notification status Inventory Information Status United States TSCA Inventory -In compliance with the inventory Mexico INSQ (INSQ)-In compliance with the inventory Canadian Domestic Substances List (DSL)-In compliance with the inventory New Zealand. Inventory of Chemical Substances -In compliance with the inventory Australia Inventory of Chemical Substances (AICS)-In compliance with the inventory Japan. CSCL -Inventory of Existing and New Chemical Substances -In compliance with the inventory Korea. Korean Existing Chemicals Inventory (KECI)-In compliance with the inventory China. Inventory of Existing Chemical Substances in China (IECSC)-In compliance with the inventory Philippines Inventory of Chemicals and Chemical Substances (PICCS)-In compliance with the inventory 15.2 WHMIS (Workplace Hazardous Materials Information System) Classification This product has been classified according to the hazard criteria of the CPR and the MSDS contains all of the information required by the CPR. Classification C:Oxidizing Material D2B:Toxic Material Causing Other Toxic Effects SAFETY DATA SHEET IXPER® 75C Calcium Peroxide Revision Date 04/20/2015 P00000020642 Version : 1.03 / CA ( Z8 ) 14/14 15.3 Other regulations no data available SECTION 16: Other information NFPA (National Fire Protection Association) -Classification Health 2 moderate Flammability 0 minimal Instability or Reactivity 0 minimal Special Notices OX Oxidizer HMIS (Hazardous Materials Identification System (Paint & Coating)) -Classification Health 2 moderate Flammability 0 minimal Reactivity 1 slight PPE Determined by User; dependent on local conditions Key or legend to abbreviations and acronyms used in the safety data sheet -TWA 8-hour, time-weighted average -SAEL Solvay Acceptable Exposure Limit -ACGIH American Conference of Governmental Industrial Hygienists -OSHA Occupational Safety and Health Administration -NTP National Toxicology Program -IARC International Agency for Research on Cancer -NIOSH National Institute for Occupational Safety and Health The information provided in this Safety Data Sheet is correct to the best of our knowledge, information, and belief at the date of its publication. Such information is only given as a guidance to help the user handle, use, process, store, transport, dispose, and release the product in satisfactory safety conditions and is not to be considered as a warranty or quality specification. It should be used in conjunction with technical sheets but do not replace them. Thus, the information only relates to the designated specific product and may not be applicable if such product is used in combination with other materials or in any other manufacturing process, unless otherwise specifically indicated. It does not release the user from ensuring he is in conformity with all regulations linked to its activity. APPENDIX C Injection Event Record – November 15, 2018 Arcadis U.S., Inc. 111-D Sanders Lane Tel 919 854 1282 Fax 919 854 5448 www.arcadis.com Page: 1/2 Division of Water Resources Attn: UIC Program 1636 Mail Service Center Raleigh, NC 27699-1636 Subject: Injection Performance Record Former ExxonMobil Facility #99GRE 615 West Friendly Avenue Greensboro, Guilford County, North Carolina Incident No. 20030 Risk Classification: Intermediate Dear Ms. Shristi Shrestha: On behalf of ExxonMobil Environmental Services (EMES), Arcadis G&M of North Carolina, Inc. (Arcadis) is submitting an Injection Event Record to the North Carolina Department of Environmental Quality (NCDEQ) - Division of Water Resources UIC Program for Former ExxonMobil Facility #99GRE (Site) located in Greensboro, Guilford County, North Carolina. The injection event was conducted from October 23 – 31, 2018, and included injecting calcium peroxide into thirteen (13) injection points as see in Figure 1. The calcium peroxide slurry was delivered into the subsurface using direct push methods via Geoprobe at each injection point. Arcadis utilized a municipal water supply from a fire hydrant located on-site to mix the 35% injection slurry by weight. The potable water was temporarily stored in a clean tank located onsite. The calcium peroxide slurry was injected into the injection points from 10 to 20 feet below ground surface (bgs). Injection flow rates and total amount injected varied based on injection interval, pressure and real-time field adaptations based on utility locations, distance to nearby monitoring well and daylighting or injection refusal at a given injection interval for a given injection point. Approximately 2,100-gallons (gal) of calcium peroxide mixture was injected during this event. - An Injection Event Record is included in Attachment 1. ARCADIS will conduct a post-injection groundwater monitoring and sampling event in conjunction with the annual groundwater sampling event in December 2018. The annual groundwater monitoring report will further detail injection activities completed on October 23- 31, 2018. Please contact me at (276) 284-2822 with any questions or concerns related to the Report or this incident number. ENVIRONMENT Date: November 15, 2018 Contact: Theresa McGuire Phone: 276.284.2822 Email: Theresa.McGuire@Arcadis.com Our ref: B0085851.0048 arcadis.com Ms. Shristi Shrestha November 15, 2018 Page: 2/2 Sincerely, Arcadis G&M of North Carolina, Inc. Theresa McGuire, P.G. Certified Project Manager Copies: Ms. Calista Campbell – EMES Ms. Carin Lee Kromm– NCDEQ UST Section Ms. Sharon Cihak– NCDEQ UST Section File – EM #99GRE Figures: Figure 1 – Benzene Plume Map Attachments: A – Injection Event Record (October 2018) B – Well Construction Record (October 2018) C – Well Abandonment Record (October 2018) FIGURES ATTACHMENT A Injection Event Record Submit the original of this form to the Division of Water Resources within 30 days of injection. Form UIC-IER Attn: UIC Program, 1636 Mail Service Center, Raleigh, NC 27699-1636, Phone No. 919-807-6464 Rev. 3-1-2016 North Carolina Department of Environmental Quality – Division of Water Resources INJECTION EVENT RECORD (IER) Permit Number________N/A – Permitted by Rule__________________ 1.Permit Information ____________________________________ Permittee _______________________________________ Facility Name _______________________________________ Facility Address (include County) 2.Injection Contractor Information _______________________________________ Injection Contractor / Company Name Street Address___________________________ _______________________________________ City State Zip Code (_____) _________________ Area code – Phone number 3.Well Information Number of wells used for injection ____________ _________________________________________ _____________________________________________ Were any new wells installed during this injection event? Yes No If yes, please provide the following information: Number of Monitoring Wells _______________ Number of Injection Wells__________________ Type of Well Installed (Check applicable type): Bored Drilled Direct-Push Hand-Augured Other (specify) ________ Please include a copy of the GW-1 form for each well installed. Were any wells abandoned during this injection event? Yes No If yes, please provide the following information: Number of Monitoring Wells _______________ Number of Injection Wells__________________ Please include a copy of the GW-30 for each well abandoned. 4.Injectant Information _______________________________________ Injectant(s) Type (can use separate additional sheets if necessary Concentration ___________________________ If the injectant is diluted please indicate the source dilution fluid.____________________________ Total Volume Injected (gal)____________________ Volume Injected per well (gal)_________________ 5.Injection History Injection date(s)_____________________________ Injection number (e.g. 3 of 5)________________ Is this the last injection at this site? Yes No I DO HEREBY CERTIFY THAT ALL THE INFORMATION ON THIS FORM IS CORRECT TO THE BEST OF MY KNOWLEDGE AND THAT THE INJECTION WAS PERFORMED WITHIN THE STANDARDS LAID OUT IN THE PERMIT. ____________________________________________________________ SIGNATURE OF INJECTION CONTRACTOR DATE ____________________________________________________________ PRINT NAME OF PERSON PERFORMING THE INJECTION ATTACHMENT B Well Construction Record WELL CONSTRUCTION RECORD (GW-1) For Internal Use Only: Form GW-1 North Carolina Department of Environmental Quality - Division of Water Resources Revised 2-22-2016 1. Well Contractor Information: Well Contractor Name NC Well Contractor Certification Number Company Name 2. Well Construction Permit #: List all applicable well construction permits (i.e. UIC, County, State, Variance, etc.) 3. Well Use (check well use): Water Supply Well: □Agricultural □Municipal/Public □Geothermal (Heating/Cooling Supply)□Residential Water Supply (single) □Industrial/Commercial □Residential Water Supply (shared) □Irrigation Non-Water Supply Well: □Monitoring □Recovery Injection Well: □Aquifer Recharge □Groundwater Remediation □Aquifer Storage and Recovery □Salinity Barrier □Aquifer Test □Stormwater Drainage □Experimental Technology □Subsidence Control □Geothermal (Closed Loop)□Tracer □Geothermal (Heating/Cooling Return) □Other (explain under #21 Remarks) 4. Date Well(s) Completed: Well ID# 5a. Well Location: Facility/Owner Name Facility ID# (if applicable) Physical Address, City, and Zip County Parcel Identification No. (PIN) 5b. Latitude and longitude in degrees/minutes/seconds or decimal degrees: (if well field, one lat/long is sufficient) N W 6. Is(are) the well(s): □Permanent or □Temporary 7. Is this a repair to an existing well:□Yes or □No If this is a repair, fill out known well construction information and explain the nature of the repair under #21 remarks section or on the back of this form. 8. For Geoprobe/DPT or Closed-Loop Geothermal Wells having the same construction, only 1 GW-1 is needed. Indicate TOTAL NUMBER of wells drilled: 9. Total well depth below land surface: (ft.) For multiple wells list all depths if different (example- 3@200’ and 2@100′) 10. Static water level below top of casing: (ft.) If water level is above casing, use “+” 11. Borehole diameter: (in.) 12. Well construction method: (i.e. auger, rotary, cable, direct push, etc.) FOR WATER SUPPLY WELLS ONLY: 13a. Yield (gpm) Method of test: 13b. Disinfection type: Amount: 14. WATER ZONES FROM TO DESCRIPTION ft. ft. ft. ft. 15. OUTER CASING (for multi-cased wells) OR LINER (if applicable) FROM TO DIAMETER THICKNESS MATERIAL ft. ft. in. 16. INNER CASING OR TUBING (geothermal closed-loop) FROM TO DIAMETER THICKNESS MATERIAL ft. ft. in. ft. ft. in. 17. SCREEN FROM TO DIAMETER SLOT SIZE THICKNESS MATERIAL ft. ft. in. ft. ft. in. 18. GROUT FROM TO MATERIAL EMPLACEMENT METHOD & AMOUNT ft. ft. ft. ft. ft. ft. 19. SAND/GRAVEL PACK (if applicable) FROM TO MATERIAL EMPLACEMENT METHOD ft. ft. ft. ft. 20. DRILLING LOG (attach additional sheets if necessary) FROM TO DESCRIPTION (color, hardness, soil/rock type, grain size, etc.) ft. ft. ft. ft. ft. ft. ft. ft. ft. ft. ft. ft. ft. ft. 21. REMARKS 22. Certification: Signature of Certified Well Contractor Date By signing this form, I hereby certify that the well(s) was (were) constructed in accordance with 15A NCAC 02C .0100 or 15A NCAC 02C .0200 Well Construction Standards and that a copy of this record has been provided to the well owner. 23. Site diagram or additional well details: You may use the back of this page to provide additional well site details or well construction details. You may also attach additional pages if necessary. SUBMITTAL INSTRUCTIONS 24a. For All Wells: Submit this form within 30 days of completion of well construction to the following: Division of Water Resources, Information Processing Unit, 1617 Mail Service Center, Raleigh, NC 27699-1617 24b. For Injection Wells: In addition to sending the form to the address in 24a above, also submit one copy of this form within 30 days of completion of well construction to the following: Division of Water Resources, Underground Injection Control Program, 1636 Mail Service Center, Raleigh, NC 27699-1636 24c. For Water Supply & Injection Wells: In addition to sending the form to the address(es) above, also submit one copy of this form within 30 days of completion of well construction to the county health department of the county where constructed. Joe Fletcher Remington Technologies, Inc. Thirteen (13) Injection Points 10/23/18-10/31/18 Former Exxon Mobil Facility #99GRE #99GRE 615 W. Friendly Ave., Greensboro, NC Guilford 20 13 2.25 Direct Push 10/31/2018 0 1.5 8 8 20 Backfill (Sand, debris, trace silt) Saprolite A total of (13) injection points were completed at 6-foot intervals. Injection interval between 10-20 ft bgs. Print Form ATTACHMENT C Well Abandonment Record WELL ABANDONMENT RECORD Form GW-30 North Carolina Department of Environmental Quality - Division of Water Resources Revised 2-22-2016 1. Well Contractor Information: Well Contractor Name (or well owner personally abandoning well on his/her property) NC Well Contractor Certification Number Company Name 2. Well Construction Permit #: List all applicable well construction permits (i.e. UIC, County, State, Variance, etc.) if known 3. Well use (check well use): Water Supply Well: □Agricultural □Municipal/Public □Geothermal (Heating/Cooling Supply)□Residential Water Supply (single) □Industrial/Commercial □Residential Water Supply (shared) □Irrigation Non-Water Supply Well: □Monitoring □Recovery Injection Well: □Aquifer Recharge □Groundwater Remediation □Aquifer Storage and Recovery □Salinity Barrier □Aquifer Test □Stormwater Drainage □Experimental Technology □Subsidence Control □Geothermal (Closed Loop)□Tracer □Geothermal (Heating/Cooling Return) □Other (explain under 7g) 4. Date well(s) abandoned: 5a. Well location: Facility/Owner Name Facility ID# (if applicable) Physical Address, City, and Zip County Parcel Identification No. (PIN) 5b. Latitude and longitude in degrees/minutes/seconds or decimal degrees: (if well field, one lat/long is sufficient) N W CONSTRUCTION DETAILS OF WELL(S) BEING ABANDONED Attach well construction record(s) if available. For multiple injection or non-water supply wells ONLY with the same construction/abandonment, you can submit one form. 6a. Well ID#: 6b. Total well depth: (ft.) 6c. Borehole diameter: (in.) 6d. Water level below ground surface: (ft.) 6e. Outer casing length (if known): (ft.) 6f. Inner casing/tubing length (if known): (ft.) 6g. Screen length (if known): (ft.) WELL ABANDONMENT DETAILS 7a. For Geoprobe/DPT or Closed-Loop Geothermal Wells having the same well construction/depth, only 1 GW-30 is needed. Indicate TOTAL NUMBER of wells abandoned: 7b. Approximate volume of water remaining in well(s): (gal.) FOR WATER SUPPLY WELLS ONLY: 7c. Type of disinfectant used: 7d. Amount of disinfectant used: 7e. Sealing materials used (check all that apply): □Neat Cement Grout □Bentonite Chips or Pellets □Sand Cement Grout □Dry Clay □Concrete Grout □Drill Cuttings □Specialty Grout □Gravel □Bentonite Slurry □Other (explain under 7g) 7f. For each material selected above, provide amount of materials used: 7g. Provide a brief description of the abandonment procedure: 8. Certification: Signature of Certified Well Contractor or Well Owner Date By signing this form, I hereby certify that the well(s) was (were) abandoned in accordance with 15A NCAC 02C .0100 or 2C .0200 Well Construction Standards and that a copy of this record has been provided to the well owner. 9. Site diagram or additional well details: You may use the back of this page to provide additional well site details or well abandonment details. You may also attach additional pages if necessary. SUBMITTAL INSTRUCTIONS 10a. For All Wells: Submit this form within 30 days of completion of well abandonment to the following: Division of Water Resources, Information Processing Unit, 1617 Mail Service Center, Raleigh, NC 27699-1617 10b. For Injection Wells: In addition to sending the form to the address in 10a above, also submit one copy of this form within 30 days of completion of well abandonment to the following: Division of Water Resources, Underground Injection Control Program, 1636 Mail Service Center, Raleigh, NC 27699-1636 10c. For Water Supply & Injection Wells: In addition to sending the form to the address(es) above, also submit one copy of this form within 30 days of completion of well abandonment to the county health department of the county where abandoned. For Internal Use ONLY: Joe Fletcher 13 Temporary Injection Points (Soil Borings) via DPT Remington Technologies, LLC Bentonite - (15) 55 lb bag for (13) soil borings. 10/23/18-10/31/18 Each borehole was abandoned by placing betonite chips from the bottom of the borehole to 1.5 ft bgs. Sand was placed from 1.5 ft bgs to 0.5 ft bgs. Asphalt patch was placed from 6-inches bgs to ground surface to match Site. Former Exxon Mobil Facility #99GRE #99GRE 615 W. Friendly Ave., Greensboro, NC 10/31/2018 Guilford IP-1 thru IP-13 20 2.26 13.15 APPENDIX D Chemical Injection Event Summary Appendix DInjection Event Summary Former ExxonMobil Facility #99-GREGreensboro, North CarolinaInjection Point/Boring IDDateTime Start Time Stop Injection Interval (ft)Average Pressure (PSI)Average Flow Rate (gal/min)Total Volume Injected (gallons)Total IXPER Injected (lbs)Injection Mix IP-0110/23/2018 10:3010:3510'-16'1008.00401600.25IP-0210/23/2018 13:5414:0414'-20'2015.001506000.25IP-0310/23/2018 15:0015:1014'-20'1511.001104400.25IP-0410/24/2018 10:0510:2514'-20'NM13.002609480.27IP-0510/24/2018 13:2013:3014'-20'NM19.001906920.27IP-0610/24/2018 14:3014:4314'-20'NM11.541506000.25IP-0710/25/2018 9:5810:1014'-20'NM12.501506000.25IP-0810/25/2018 10:3510:5010'-16'NM10.001506000.25IP-0910/25/2018 14:4514:5610'-16'NM13.641506000.25IP-1010/25/2018 16:5017:0610'-16'NM9.371506000.25IP-1110/29/2018 12:3512:5014'-20'NM10.001506000.25IP-1210/30/2018 10:1810:3010'-16'NM12.501506000.25IP-1310/30/2018 13:4014:1010'-20'NM10.003001,2000.25122,0608,2400.25Notes: IXPER - Calcium Peroxide IXPER 75 C Injection Mix - (gallons of water / lbs of IXPER Added)PSI - Per Square Inch lbs - Pounds Gal - GallonInjection Summary Totals: 1/1 APPENDIX E Field Parameters Appendix E Field Parameters (October 22 - November 2, 2018)Former ExxonMobil Facility #99-GREGreensboro, North CarolinaDateTimeTemprature (CO)Specific Conductance (uS/cm)pH (SU)DO (mg/l)DO Sat. %ORP (mV)10/22/201814:0021.46624 6.66 -----40.010/23/201817:5521.36688 6.12 -----33.410/24/2018-------- ------17:1522.041,509 11.47 31.43---25.218:0022.141,450 11.73 36.61 421.536.119:5522.311,359 11.72 36.3 419.215.020:5522.351,246 11.66 35.77 413.315.021:5522.351,187 11.63 35.43 409.410.922:5522.311,312 11.65 35.69 412.29.323:5522.291,317 11.65 35.06 404.79.50:5522.291,311 11.64 35.18 406.19.71:5522.301,244 11.61 34.68 400.410.32:5522.261,276 11.59 35.26 406.815.03:5522.281,269 11.61 34.51 398.29.04:5522.291,243 11.59 34.09 393.49.65:5522.31,238 11.58 34.21 394.99.36:5522.291,233 11.58 33.94 391.710.37:5522.251,282 11.59 34.39 396.910.78:5522.291,236 11.57 34.3 395.810.99:5522.261,219 11.56 34.21 394.613.010:5522.271,195 11.54 34.43 397.112.811:5522.261,193 11.54 33.82 390.012.912:5522.281,173 11.53 33.41 385.514.013:5522.301,163 11.52 33.49 386.414.614:5522.261,180 11.52 33.31 384.115.0015:5522.301,134 11.50 33.57 387.418.116:5522.281,153 11.52 32.81 378.515.017:5522.301,134 11.51 32.54 375.615.3Notes:-- Not Measured ORP Oxidation-Reduction Potential.DTW Depth to WaterDO Dissolved Oxygen.SU Standard UnitsC Celcius 1/ Field paramater measurments were continuously recorded with YSI model #6820. uS/cm microsimens per centimetermV milivoltsmg/L miligrams per literSat.% DO Percent Saturated Well IDMW-1R 110/25/201810/26/20181/7 Appendix E Field Parameters (October 22 - November 2, 2018)Former ExxonMobil Facility #99-GREGreensboro, North CarolinaDateTimeTemprature (CO)Specific Conductance (uS/cm)pH (SU)DO (mg/l)DO Sat. %ORP (mV)6:5522.271,01011.41 32.12 370.429.67:5522.301,13411.41 32.01 369.129.78:5522.301,01011.41 31.97 368.630.39:5522.2899411.40 31.85 367.231.910:5522.2999411.40 31.29 360.931.811:5522.271,00111.40 31.52 363.331.712:5522.2799811.40 32.00 368.932.113:5522.2698811.39 32.06 369.53314:5522.2896711.38 31.94 368.235.115:5522.2696311.38 31.29 360.635.116:5522.2497711.38 31.46 362.534.717:5522.2896211.37 31.34 361.434.56:5522.2496911.37 30.28 348.836.77:5522.2296811.37 30.36 349.736.78:5522.2596411.36 30.46 351.036.69:5522.2496711.37 30.32 349.336.710:5522.2596411.37 30.15 347.436.611:5522.2496811.36 31.14 358.836.512:5522.2496111.35 30.84 355.237.313:5522.2596511.36 30.38 350.136.514:5522.2695311.35 30.69 353.737.715:5522.2895111.35 29.99 345.738.716:5522.2695711.35 30.34 349.738.717:5522.2695211.34 30.07 346.539.418:5522.2495311.33 30.71 353.839.15:5522.2594711.34 30.09 346.738.96:5522.3093811.32 30.14 347.640.37:5522.2993611.32 29.87 344.439.9Notes:-- Not Measured ORP Oxidation-Reduction Potential.DTW Depth to WaterDO Dissolved Oxygen.SU Standard UnitsC Celcius 1/ Field paramater measurments were continuously recorded with YSI model #6820. uS/cm microsimens per centimetermV milivoltsmg/L miligrams per literSat.% DO Percent Saturated 10/27/201810/28/201810/29/2018Well IDMW-1R 12/7 Appendix E Field Parameters (October 22 - November 2, 2018)Former ExxonMobil Facility #99-GREGreensboro, North CarolinaDateTimeTemprature (CO)Specific Conductance (uS/cm)pH (SU)DO (mg/l)DO Sat. % ORP (mV)8:5522.31930 11.32 29.98 345.840.39:5522.3926 11.31 30.18 348.041.310:5522.3924 11.31 29.69 342.340.817:5522.2410,928 11.79 37.29 444.120.97:5522.458,079 11.76 33.65 398.4-20.110:55 222.495,688 11.73 33.58 394.6-19.117:5520.596,509 12.98 44.00 500.0-17.318:5521.016,819 13.02 43.60 500.0-16.719:5521.26,809 13.04 43.44 500.0-16.120:5521.326,738 13.04 43.36 500.0-15.37:5521.765,183 13.02 43.22 500.0-10.38:5522.133,837 12.55 38.23 443.410.09:5522.133,911 12.55 38.58 447.711.810:5522.183,939 12.54 38.96 452.512.611:5521.213,991 12.54 39.25 456.213.0Notes:--- Not Measured/ ORP Oxidation-Reduction Potential.DTW Depth to WaterDO Dissolved Oxygen.SU Standard UnitsC Celcius 1/ Field paramater measurments were continuously recorded with YSI model #6820. uS/cm microsimens per centimeter2/ Injectant cleared from Monitoring well (MW-1R).mV milivoltsmg/L miligrams per liter Injectant detected during well inspection at monitoring well (MW-1R) on 10/29/2018.Sat.% DO Percent Saturated Post- Injection Field Paramater Measurements (October 30, 2018 - November 2, 2018)Well ID10/29/2018MW-1R 110/30/201810/31/20183/7 Appendix E Field Parameters (October 22 - November 2, 2018)Former ExxonMobil Facility #99-GREGreensboro, North CarolinaDateTimeTemprature (CO)Specific Conductance (uS/cm)pH (SU)DO (mg/l) DO Sat. %ORP (mV)7:5522.404,918 12.61 42.28 494.713.88:5522.414,966 12.61 42.14 493.213.99:5522.415,023 12.61 42.16 493.613.510:5522.425,073 12.62 42.15 493.713.511:5522.405,114 12.62 42.19 494.013.512:5522.435,148 12.62 42.18 494.213.313:5522.415,205 12.63 42.19 494.213.214:5522.425,246 12.63 42.35 496.313.115:5522.435,303 12.64 42.28 495.712.916:5522.425,380 12.65 42.20 494.812.817:5522.435,439 12.65 42.21 495.112.619:5522.455,510 12.66 42.23 495.512.520:5522.435,564 12.66 42.50 498.612.521:5522.445,629 12.67 42.27 496.112.422:5522.465,684 12.67 42.17 495.412.20:5522.455,830 12.68 42.36 497.612.01:5522.455,857 12.69 42.38 498.011.82:5522.455,921 12.69 42.36 497.611.73:5522.436,098 12.70 42.11 495.011.54:5522.436,097 12.70 42.05 494.211.56:5522.446,175 12.71 41.92 493.011.47:5522.456,337 12.72 41.84 492.411.28:5522.486,399 12.72 42.13 496.211.29:5522.466,493 12.73 41.95 494.011.110:5522.456,591 12.73 41.79 492.311.011:5522.476,667 12.74 42.01 495.210.9Notes:--- Not Measured/ORP Oxidation-Reduction Potential.DTW Depth to WaterDO Dissolved Oxygen.SU Standard UnitsC Celcius 1/ Field paramater measurments were continuously recorded with YSI model #6820. uS/cm microsimens per centimetermV milivolts Post- Injection Field Paramater Measurements (October 30, 2018 - November 2, 2018)mg/L miligrams per literSat.% DO Percent Saturated 11/1/201811/2/2018MW-1R 1Well ID4/7 Appendix E Field Parameters (October 22 - November 2, 2018)Former ExxonMobil Facility #99-GREGreensboro, North CarolinaDateTimeTemprature (CO)Specific Conductance (uS/cm)pH (SU)DO (mg/l)DO Sat. %ORP (mV)10/22/2019--------------17:5522.184906.18 -----13.318:5521.065016.22 -----19.819:5521.144986.21 ----0.620:5521.174966.21 ----1.921:5521.184946.20 -----2.522:5521.194946.20 -----4.723:5521.204946.20 -----22.20:5521.214936.20 -----31.41:5521.214926.20 -----39.52:5521.214916.20 -----43.63:5521.214916.20 -----43.64:5521.214916.20 -----52.15:5521.214916.20 -----54.06:5521.214906.20 -----55.97:5521.214906.20 -----59.48:5521.224906.20 -----62.19:5521.224906.20 -----64.310:5521.244906.20 -----67.211:5521.204936.20 -----70.712:5521.204926.20 -----76.713:5521.094726.14 -----73.414:5521.074746.14 -----77.915:5521.114976.16 -----83.316:3521.144966.16 -----83.917:1521.31589-- 26.76--130.418:0021.194166.38 15.28 172.2304.319:0021.284186.34 14.5 163.7294.2Notes:--- Not Measured/ORP Oxidation-Reduction Potential.DTW Depth to WaterDODissolved Oxygen.SU Standard UnitsC Celcius uS/cm microsimens per centimetermV milivoltsmg/L miligrams per literSat.% DO Percent Saturated 1/ Field paramater measurments were continuously recorded with YSI model #6820.Well IDMW-9 110/23/201810/24/201810/25/20185/7 Appendix E Field Parameters (October 22 - November 2, 2018)Former ExxonMobil Facility #99-GREGreensboro, North CarolinaDateTimeTemprature (CO)Specific Conductance (uS/cm)pH (SU)DO (mg/l)DO Sat. %ORP (mV)20:0021.254216.34 15.0 169.3 289.121:0021.284256.35 15.06 170.0 284.022:0021.334276.33 15.35 173.5 276.523:0021.334286.32 14.64 165.5 268.10:0021.354276.33 14.18 160.3 259.21:0021.344266.32 13.57 153.4 249.62:0021.324256.30 13.67 154.5 238.03:0021.314246.32 14.23 160.7 214.44:0021.34236.30 13.9 157194.85:0021.294236.29 13.91 157.1 173.36:0021.294226.29 14.00 158.1 161.27:0021.294226.30 14.25 160.9 151.98:0021.284216.30 14.41 162.7 146.79:0021.284216.31 15.11 170.6 148.110:0021.314216.29 15.09 170.4 143.511:0021.304216.30 15.43 174.3 137.612:0021.304206.30 15.03 169.7 132.913:0021.314206.29 14.57 164.6 130.814:0021.304206.29 15.05 170.0 127.8015:0021.314206.29 14.7 166.0 130.116:0021.314206.30 14.45 163.3 127.317:0021.314196.30 14.36 162.3 126.87:0021.354186.30 13.97 158.0 139.68:0021.354186.30 13.92 157.4 141.69:0021.364186.31 14.26 161.3 146.110:0021.354186.31 14.21 160.7 143.711:0021.364186.31 14.39 162.7 143.612:0021.374186.31 14.69 166.1 141.7Notes:--- Not Measured ORP Oxidation-Reduction Potential.DTW Depth to WaterDODissolved Oxygen.SU Standard UnitsC Celcius uS/cm microsimens per centimetermV milivoltsmg/L miligrams per literSat.% DO Percent Saturated 1/ Field paramater measurments were continuously recorded with YSI model #6820.Well IDMW-9 110/25/201810/26/201810/27/20186/7 Appendix E Field Parameters (October 22 - November 2, 2018)Former ExxonMobil Facility #99-GREGreensboro, North CarolinaDateTimeTemprature (CO)Specific Conductance (uS/cm)pH (SU)DO (mg/l)DO Sat. %ORP (mV)13:0021.374186.31 14.23 160.9142.614:0021.374176.30 14.53 164.4146.115:0021.384176.30 14.26 161.3149.016:0021.384176.31 14.16 160.2148.117:0021.384176.30 14.64 165.6148.118:0021.384176.30 14.24 161.1148.97:0021.424166.30 11.27 127.6149.78:0021.424166.31 10.67 120.8148.49:0021.434166.31 10.25 116.1147.910:0021.434156.31 10.07 114.0146.511:0021.434166.30 10.48 118.7142.712:0021.434166.30 10.3116.7142.713:0021.444156.30 9.93112.5140.314:0021.444156.30 10.18 115.3139.515:0021.444156.31 9.78110.8139.916:0021.444146.30 9.98113.1138.717:0021.434146.30 10.11 114.5139.218:0021.454146.29 9.75110.5139.819:0021.454146.29 10.58 119.9142.37:0021.484116.28 7.0379.7135.88:0021.484116.29 7.4184.1137.69:0021.494116.28 7.8689.1136.710:0021.494116.287.291.6138.211:0021.494116.28 7.2982.7134.67:0021.47--6.40 6.3672.2187.78:0021.48--6.39 6.1169.4189.410:0021.46--6.35 5.7164.8187.915:0021.285707.68 9.74--45.110/31/2018--------------11/1/2018--------------13:1021.594976.57 10.78 122.5155.413:1521.694886.44 13.49 153.6244.0Notes:--- Not Measured ORP Oxidation-Reduction Potential.DTW Depth to WaterDODissolved Oxygen.SU Standard UnitsC Celcius uS/cm microsimens per centimetermV milivoltsPost- Injection Measurements (October 30, 2018 - November 2, 2018)mg/L miligrams per literSat.% DO Percent Saturated 1/ Field paramater measurments were continuously recorded with YSI model #6820.10/28/201810/29/201810/30/2018Well ID10/27/2018MW-9 111/2/20187/7 Arcadis G&M of North Carolina., Inc. 5420 Wade Park Boulevard, Suite 350 Raleigh, North Carolina 27607 Tel 919 854 1282 Fax 919 854 5448 www.arcadis.com