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HomeMy WebLinkAboutDC920047_20240627_GroundwaterMonitoringReport GROUNDWATER MONITORING REPORT FORMS DSCA ID No.: Submittal Date: Reporting Period:to Type of Report:One-Time Event Quarterly Semi-Annual Annual 6/27/2024 DC920047 Feb-24 Feb-24 Groundwater Monitoring Report Forms for North Carolina Dry-Cleaning Solvent Cleanup Act Program Prepared By: Facility Name:Southgate Cleaners 1965 Rock Quarry Road, Raleigh, Wake County, North Carolina 2725 East Millbrook Road, Suite 121, Raleigh, NC 27604 ATC Associates of North Carolina, P.C. Table of Contents DSCA ID No.: DC920047 Form/Att . No. Check box if included Form 1 Report Summary Form 2 Quality Assurance/Quality Control Procedures Form 3 Results, Conclusions and Recommendations Att. 1 Att. 2 Att. 3 Att. 4 Att. 5 Disposal of IDW receipts from receiving facilities, or any required hazardous GWMR TOC Description Groundwater Monitoring Report Attachments Groundwater Monitoring Report Forms Report Summary DSCA ID No.: DC920047 Dates samples were collected: Number of existing monitoring wells: List the sampled monitoring wells: List the sampled water supply wells: List surface water samples collected: Date analyses were performed: Were any holding times exceeded? Dates monitoring/supply wells were gauged: disposal? Average depth to groundwater: Groundwater flow direction: Was the static groundwater level above the top of the well screen in any wells? If Yes, indicate which wells: Is the aquifer: Were any existing monitoring wells damaged? If Yes, indicate which wells: Has the groundwater plume been defined? Any ongoing assessment activities? If Yes, provide details in the space below: Any ongoing remediation activites? If Yes, provide details in the space below: Any significant changes in the subsurface conditions? If Yes, provide details in the space below: GWMR Form 1 18.35 2/15/2024 8 MW-2, MW-5, MW-7, and MW-8 2/19/2024, 2/21/2024, and 2/22/2024 Does investigation derived waste (IDW) generated during these activities still remain at the site pending Tetrachloroethylene (PCE) concentrations in MW-5 have decreased to below Title 15A NCAC 02L .0202 Groundwater Quality Standards (2L Standards) for the first time since the well was initially sampled in January 2014. Additionally, PCE concentrations in MW-2 have increased to above the 2L Standards. 2/15/2024 East MW-2, MW-5, MW-6, and MW-7 Not Applicable Not Applicable Yes No Yes No Confined Unconfined Perched Yes No Yes No Yes No Yes No Yes No Yes No Quality Assurance/Quality Control Procedures DSCA ID No.: DC920047 Describe the specific sampling technicque employed during the collection of all ground water samples. The EPA approved method for VOC analysis used to run groundwater samples from the site is SW846 8260D. Groundwater samples are directly injected into a gas chromatograph (GC) and then introduced directly to a capillary column where they are flash evaporated for analysis. The column is temperature-programmed to separate the analytes, which are then detected with a mass spectrometer (MS) interfaced to the GC. The holding time for VOC analysis via EPA Method 8260D is 14 days from collection to analysis. GWMR Form 2 Describe the standard quality assurance/quality control (QA/QC) procedures which are practiced in order to ensure that the samples are representative of actual conditions and that analytical results are valid. Describe the EPA approved methods used to extract and analyze the samples submitted the laboratory. Reference the maximum holding time for each type of analysis performed. For groundwater sampling, ATC followed standard low flow sampling procedures for volatile organic compounds (VOCs) as outlined in the current United States Environmental Protection Agency Laboratory Services and Applied Science Division (US EPA LSASD) Groundwater Sampling Operating Procedure. Field parameters, including pH, oxidation/reduction potential, conductivity, specific conductance, dissolved oxygen, temperature, and depth to water were measured every three minutes during well purging. Stabilization was achieved when pH remained constant within 0.1 Standard Units and specific conductance varied no more than 5 percent. Groundwater samples were collected in three 40 milliliter vials preserved with hydrochloric acid and filled to zero headspace for each monitoring well. Each sample was then placed in an ice filled cooler. A chain-of-custody form was completed for the sampling event and accompanied the samples to the laboratory. Chemical analyses were performed on groundwater samples by Pace Analytical in Mt. Juliet, Tennessee. Extractions and analyses were performed in accordance with standard EPA Method 8260D for VOCs. ATC Associates of North Carolina, P.C. has reviewed the laboratory report, and no quality assurance/quality control issues were identified. The data are deemed usable for the purposes of the assessment activities and conclusions documented in this submittal. Groundwater samples were collected using low flow sampling methods as outlined in the current US EPA LSASD Groundwater Sampling Operating Procedure. Well purging and sampling were completed using a peristaltic pump and the soda straw method. The polyethylene tubing was replaced at each monitoring well location prior to sampling. Field parameters, including pH, oxidation/reduction potential, conductivity, specific conductance, dissolved oxygen, and temperature, were measured every three minutes using a YSI multimeter and flow-through cell. Before obtaining a sample, field parameters were allowed to stabilize within EPA guidelines to ensure a representative groundwater sample was collected. Results, Conclusions and Recommendations DSCA ID No.: DC920047 Sampling Date Sample ID Concentration [mg/L] Sampling Date Sample ID Concentration [mg/L] 02/15/24 MW-7 0.0311 01/20/15 MW-7 0.11 02/15/24 MW-7 0.000206J 08/15/16 MW-7 (UST)0.0329 N/A N/A ND N/A N/A ND 02/15/24 MW-5 0.000880 02/15/24 MW-5 0.000880 N/A N/A ND 1/23/2015 MW-5 (UST)18.4 N/A N/A ND 2/3/2014 MW-1 28 N/A N/A ND 1/23/2015 MW-5 (UST)3.57 N/A N/A ND 1/23/2015 MW-1 24.4 N/A N/A ND 2/3/2014 MW-1 1.4 If funding is available, ATC recommends installation of additional wells for plume delineation purposes. In the interim, ATC recommends continued monitoring. 1,2-Dichloroethane Benzene Toluene Xylenes (total) Naphthalene Instructions: Discuss any trends or changes noted in analytical results. Conclusions Recommendations The results of recent and historical groundwater sampling events indicate a release from the former Southgate Cleaners resulting in impacts to groundwater. The Febraury 2024 sampling event indicates concentrations of PCE above the 2L Standards. 1,2-Dichloroethane was also detected above 2L Standard in one monitoring well. The extent of impacted groundwater extends approximately 560 feet off-site in the downgradient direction and is not delineated. PCE concentrations appear to be stable or decreasing with well MW-5 exhibiting a concentration of PCE below the 2L Standard for the first time since the well was initially sampled in January 2014. Ethylbenzene Tetrachloroethylene Trichloroethylene Vinyl Chloride GWMR Form 3 Results Maximum Concentration Detected in Groundwater Chemical Most Recent Event Detected at Site To-date ATTACHMENT 1 DISPOSAL DOCUMENTATION FOR INVESTIGATIVE DERIVED WASTE ANALYTICAL DATA TABLES DSCA ID No.: Submittal Date: Analytical Data Tables for North Carolina Dry-Cleaning Solvent Cleanup Act Program Prepared By: Facility Name:Southgate Cleaners 1965 Rock Quarry Road, Raleigh, Wake County, North Carolina 2725 East Millbrook Road, Suite 121, Raleigh, North Carolina 27604 ATC Associates of North Carolina, P.C. 6/27/2024 DC920047 Table of Contents DSCA ID No.: DC920047 Table/ Att. No. Check box if included Table 1 Site Chronology Table 2 Analytical Data for Soil Table 3 Analytical Data for Sub-slab Gas Table 4 Analytical Data for Soil Gas Table 5 Analytical Data for Indoor and Outdoor Air Table 6 Monitoring Well Construction Data Table 7 Groundwater Elevation Data Table 8 Analytical Data for Groundwater Table 9 Analytical Data for Surface Water Table 10 Water Well(s) Survey Data Table 11 Analytical Data for Water Supply Well(s) Table 12 Analytical Data for Natural Attenuation Parameters Att. 1 Site map showing location(s) of soil boring(s). Att. 2 Att. 3 Soil isoconcentration maps. Att. 4 Site map showing location(s) of monitoring well(s). Att. 5 Att. 6 Groundwater gradient map for each sampling event. Att. 7 Att. 8 Att. 9 Map showing location(s) of surface water sample(s) (if applicable). Att. 10 Att. 11 Att. 12 Att. 13 Att. 14 Air and soil gas concentration map showing the concentration at each sampling point. Att. 15 Att. 16 Att. 17 Att. 18 Att. 19 Att. 20 Att. 21 Note: 1. All maps must include a bar scale, north arrow, site name, DSCA ID No., and date. Photograph Log USGS Quad map with plotted water well location(s)within the 1,500 foot and 0.5 mile radii of the site (if applicable). Signed laboratory analytical reports including chain-of custody and quality assurance/quality control (QA/QC)documentation (only if not previously submitted). Soil contaminant concentration maps showing the concentration at each sampling point. Site map showing location(s) of indoor air, outdoor air, or soil gas samples. Well completion diagrams and records of construction submitted to state. PCE concentration map showing the concentration at each sampling point and isoconcentration map.However,if there are significant plumes for other dry- cleaning contaminants,contaminant concentration maps for each chemical of concern should be included. Surface water concentration map showing the concentration at each sampling point (if applicable). Site map showing location(s) of monitoring well(s) for natural attenuation parameters. ADT TOC Description Attachments Tables Groundwater concentration trend plots. Table 1: Site Chronology DSCA ID No.: DC920047 Chronology of Events 6/29/2012 Mid-Atlantic Associates, Inc. (MAA) submitted a Phase I Environmental Site Assessment (ESA) report for the property located at 1969 Rock Quarry Road in Raleigh, NC (site). According to the report, the 0.91-acre site contains a gasoline station. The city directory search of this report indicates that a dry-cleaning facility (Southgate Cleaners) historically operated at the site (under the address of 1965 Rock Quarry Road) from approximately 1972 to 1992. 7/27/2012 MAA submitted a Phase II ESA report for the site. The objective of this assessment was to evaluate the site for potential environmental contamination associated with the historical and current operation of gasoline stations and dry-cleaning facilities on and off site. Five temporary groundwater monitoring wells (TMW-1 through TMW-5) were installed and sampled. Analytical results indicated tetrachloroethylene (PCE) and daughter products were found in site groundwater samples, and PCE was detected in exceedance of the 15A NCAC 2L .0202 Groundwater Standard (2L Standard). It should be noted the Phase II ESA also identified impacts associated with a petroleum release. As a result, the site was issued UST Incident #39233. This incident is currently being monitored by the NCDEQ UST Program. 9/19/2013 Monitoring well MW-1 was installed and sampled during a Limited Site Assessment (LSA) associated with UST Incident #39233. This well is used for assessing both the Southgate Cleaners and UST Incident #39233. 1/6/2014 - 2/3/2014 Amec Foster Wheeler Environment & Infrastructure, Inc. (Amec Foster Wheeler) conducted Prioritization Assessment (PA) field activities which included collection of soil samples from 11 soil borings (SB-1 through SB-11), collection of groundwater samples from 13 direct-push borings (GW-1 through GW-13 and GW-15), installation of five permanent 2- inch Type II monitoring wells (MW-2 through MW-6), collection of groundwater samples from the new wells and existing well MW-1, and collection of two surface water samples (SW-1 and SW-2) from a nearby unnamed tributary to Walnut Creek located east of the site. Three near-slab soil gas samples (NS-1 through NS-3) were also collected surrounding the existing on-site gas station/convenience store. A fourth near-slab soil gas sample was proposed to the north of the site gas station/convenience store, but could not be installed due to the presence of utilities associated with the existing underground storage tank (UST) operations. Amec Foster Wheeler also completed a Level I Ecological Risk Assessment (ERA) within 0.5 miles of the site, a receptor survey within 500 feet of the site, and a "windshield" water- supply well survey within 1-mile of the site. 4/28/2014 - 5/13/2014 Two indoor air samples (IA-1 and IA-2) and two sub-slab gas samples (SS-1 and SS-2) were collected from within the on-site Valero gas station/convenience store. Two ambient air background samples were collected, one between the pump islands and the door to the store (AA-1) and one from an upwind location near the southern property boundary (AA-2). In addition, seven near-slab soil gas samples (NS-4 through NS-10) were collected from the South Ridge Apartment Homes property to the north and east of the site. 8/28/2014- 9/11/2014 Thirteen indoor air samples (IA-3 through IA-8 and IA-10 through IA-15) were collected within off-site residential apartment buildings on adjacent parcels to the north and east of the former dry-cleaner location. Two additional ambient air samples (AA-3 and AA-4) were collected at the off-site residential land parcels. [Note: Apartment adjacent to IA-13 was not accessible and sample IA-9 (adjacent to IA-10) had been removed during sampling event]. 1/16/2015- 1/20/2015 Two monitoring wells (MW-7 and MW-8) were installed and sampled. Also, one indoor air sample (IA-16) was collected in the same living space as IA-6 to verify the previous result by resampling. 1/20/2015-1/23/2015 A sampling event associated with UST Incident #39233 was performed. As a result, wells MW-1 through MW-7 and TW-1 associated with the incident were sampled. 5/26/2015 Two near-slab soil gas samples (NS-11 and NS-12) were collected from the South Ridge Apartment Homes property to the north of the site. 8/20/2015 Wells associated with UST Incident #39233 (MW-8 through MW-12) were sampled. 9/17/2015- 10/1/2015 ATC Associates of North Carolina, P.C. (ATC) collected three indoor air samples (IA-17 through IA-19) from the South Ridge Apartment Homes property to the north and east of the site. Samples were collected using both Radiellos and sorbent tubes in order to evaluate the comparative results for the two sampling methods. In addition, a passive soil gas survey was performed to evaluate the source for soil gas impacts identified north-northeast of the site in the area of the South Ridge Apartment Homes property. Locations were targeted to identify whether the source was the former dry- cleaner on the site property or another dry-cleaner located to the west (Glam-O-Rama Cleaners [DC920049]). The passive soil gas survey was performed using Beacon Environmental Services, Inc. samplers installed at 18 locations (B-1 through B-18). Instructions:Brief description of all significant events that have occurred since a problem was suspected at the facility.Commence with the first date a problem was suspected and continue through the most recent activity described in the current report. Date ADT 1 Page 1 of 2 Table 1: Site Chronology DSCA ID No.: DC920047 Chronology of Events Instructions:Brief description of all significant events that have occurred since a problem was suspected at the facility.Commence with the first date a problem was suspected and continue through the most recent activity described in the current report. Date ADT 1 4/26/2016 ATC submitted a Vapor Intrusion Assessment Report documenting the September and October 2015 activities. 6/17/2016 Four indoor air samples (IA-20 through IA-23) were collected from the South Ridge Apartment Homes property to the north and south of the site. 8/15/2016 Wells associated with UST Incident #39233 (MW-1 through MW-12 and TW-1) were sampled. 10/26/2016 Three soil gas points were installed and sampled (NS-13S, NS-13D, and NS-14). Points were installed at the South Ridge Apartment Homes property to the east of the site. 4/25/2017- 5/2/2017 One sub-slab gas (SS-3) and one indoor air (IA-24) sample were collected from the South Ridge Apartment Homes property to the east of the site. 10/20/2017 ATC collected depth to water readings from all wells associated with the site (MW-1 through MW-8). Groundwater samples were also collected from wells MW-2, MW-5, MW-7, and MW-8. 11/15/2017 ATC submitted a Vapor Intrusion Assessment Report documenting activities performed between June 2016 and May 2017. 1/3/2018 ATC submitted a Groundwater Monitoring Report documenting the October 2017 groundwater sampling activities. 1/7/2020- 1/10/2020 ATC installed and sampled eight soil gas monitoring points (SGMP-1 through SGMP-8). 4/17/2020 ATC submitted a Soil Gas Sampling Letter Report documenting the January 2020 assessment activities. 3/3/2021 ATC sampled four monitoring wells (MW-2, MW-5, MW-7, and MW-8). 5/13/2021 ATC submitted a Groundwater Monitoring Report documenting the March 2021 groundwater sampling activities. 2/15/2024 ATC sampled four monitoring wells (MW-2, MW-5, MW-7, and MW-8). Page 2 of 2 Table 2: Analytical Data for Soil DSCA ID No.: DC920047 Be n z e n e ci s - 1 , 2 - D i c h l o r o e t h y l e n e Et h y l b e n z e n e Me t h y l t e r t - b u t y l e t h e r (M T B E ) Na p h t h a l e n e Te t r a c h l o r o e t h y l e n e To l u e n e tr a n s - 1 , 2 - D i c h l o r o e t h y l e n e Tr i c h l o r o e t h y l e n e Vi n y l c h l o r i d e Xy l e n e s ( t o t a l ) m, p - X y l e n e o- X y l e n e 0.01 0.41 6.1 0.09 0.39 0.0063 8.3 0.62 0.021 0.021 9.9 9.8 9.8 SB-1-5 5 01/06/14 <0.012 <0.012 <0.012 NA NA <0.012 <0.012 <0.012 <0.012 <0.012 <0.037 <0.025 <0.012 SB-1-15 15 01/06/14 <0.013 <0.013 <0.013 NA NA <0.013 <0.013 <0.013 <0.013 <0.013 <0.040 <0.027 <0.013 SB-2-6 6 01/06/14 <0.012 <0.012 <0.012 NA NA <0.012 <0.012 <0.012 <0.012 <0.012 <0.036 <0.024 <0.012 SB-3-5 5 01/06/14 <0.012 <0.012 <0.012 NA NA <0.012 <0.012 <0.012 <0.012 <0.012 <0.035 <0.023 <0.012 SB-4-5 5 01/06/14 0.015 <0.013 <0.013 NA NA <0.013 0.010J <0.013 <0.013 <0.013 <0.038 <0.025 <0.013 SB-5-6 6 01/07/14 0.011J <0.013 <0.013 NA NA <0.013 0.007J <0.013 <0.013 <0.013 <0.040 <0.027 <0.013 SB-6-4 4 01/07/14 0.011J <0.013 <0.013 NA NA <0.013 0.007J <0.013 <0.013 <0.013 <0.040 <0.027 <0.013 SB-7-4 4 01/07/14 <0.013 <0.013 <0.013 NA NA <0.013 <0.013 <0.013 <0.013 <0.013 <0.039 <0.026 <0.013 SB-8-6 6 01/07/14 <0.014 <0.014 <0.014 NA NA <0.014 <0.014 <0.014 <0.014 <0.014 <0.041 <0.027 <0.014 SB-8-15 15 01/07/14 <0.013 <0.013 <0.013 NA NA <0.013 <0.013 <0.013 <0.013 <0.013 <0.038 <0.025 <0.013 SB-9-8 8 01/07/14 <0.013 <0.013 <0.013 NA NA <0.013 <0.013 <0.013 <0.013 <0.013 <0.038 <0.025 <0.013 SB-10-5 5 01/07/14 <0.013 <0.013 <0.013 NA NA 0.009J <0.013 <0.013 <0.013 <0.013 <0.039 <0.026 <0.013 SB-10-15 15 01/07/14 <0.013 <0.013 <0.013 NA NA <0.013 <0.013 <0.013 <0.013 <0.013 <0.039 <0.026 <0.013 SB-11-6 6 01/08/14 0.17 <0.012 0.027 NA NA <0.012 0.007J <0.012 <0.012 <0.012 0.317 0.23 0.087 SB-11-14 14 01/08/14 0.034 <0.011 <0.011 NA NA <0.011 <0.011 <0.011 <0.011 <0.011 0.039 0.027 0.012 3. < = Not detected above laboratory reporting limit. 4. J = Estimated value above laboratory method detection limit, but below laboratory reporting limit. Notes: NCDEQ PSRGs (February 2024) Sa m p l e I D Sa m p l i n g D a t e ( m m / d d / y y ) De p t h [f e e t b g s ] 1. BOLD = Exceeds the lower of the Inactive Hazardous Sites Branch Residential and Protection of Groundwater Preliminary Soil Remediation Goals (February 2024). [mg/kg] 2. NA - Not Analyzed ADT 2 Page 1 of 1 Table 3: Analytical Data for Sub-slab Gas DSCA ID No.: DC920047 Be n z e n e ci s - 1 , 2 - D i c h l o r o e t h y l e n e Et h y l b e n z e n e Me t h y l t e r t - b u t y l e t h e r (M T B E ) Na p h t h a l e n e Te t r a c h l o r o e t h y l e n e To l u e n e tr a n s - 1 , 2 - D i c h l o r o e t h y l e n e Tr i c h l o r o e t h y l e n e Vi n y l c h l o r i d e Xy l e n e s ( t o t a l ) 1, 1 , 2 - T r i c h l o r o - 1 , 2 , 2 - tr i f l u o r o e t h a n e (F r e o n 1 1 3 ) 1, 2 - D i c h l o r o - 1 , 1 , 2 , 2 - te t r a f l u o r o e t h a n e (F r e o n 1 1 4 ) 1, 2 - D i c h l o r o e t h a n e 2- B u t a n o n e ( M E K ) Ac e t o n e Ca r b o n D i s u l f i d e 160 3,500 490 4,700 36 3,500 440,000 3,500 180 280 8,800 440,000 NE 47 440,000 NE 61,000 SS-1 6 6 32 min 05/12/14 <0.32 <0.40 <0.43 <0.36 <0.52 <0.68 0.32J <0.40 <0.54 <0.26 0.23J 0.98 0.18J 0.14J 0.96J 46 0.33J SS-2 6 6 37 min 05/12/14 <0.32 <0.40 <0.43 <0.36 <0.52 <0.68 0.30J <0.40 <0.54 <0.26 0.23J 1.1 0.18J 0.12J 1.0J 38 0.33J 12 280 37 360 2.8 280 35,000 280 14 5.6 700 35,000 NE 3.6 35,000 NE 4,900 SS-3*6 6 2 min 05/02/17 NA <4.0 NA NA NA <6.9 NA <8.0 <5.5 <2.6 NA NA NA NA NA NA NA Notes: DWM Residential SGSLs (February 2024) DWM Non-Residential SGSLs (February 2024) 1. Indicate "G" for grab sample or for longer samples indicate the number of hours followed by "h". Sa m p l e I D Sa m p l i n g D a t e ( m m / d d / y y ) De p t h [i n c h e s b g s ] [µg/m3]Sl a b T h i c k n e s s [i n c h e s ] Sa m p l i n g D u r a t i o n 1 7. * = Sample collected from property classified as residential land use. Other samples were collected from a property classified as non-residential. 2. DWM SGLSs = Division of Waste Management Soil-Gas Sreening Levels. 3. BOLD = Concentration exceeds DWM Residential Soil-Gas Screening Levels. 4. NE = Not Established. 5. "J" flagged values are estimated concentrations. Other qualifications are detailed in the laboratory report. 6. NA = Not Analyzed. ADT 3 Page 1 of 2 Table 3(1): Analytical Data for Sub-slab Gas (User Specified Chemicals) DSCA ID No.: DC920047 Ca r b o n T e t r a c h l o r i d e Ch l o r o f o r m Ch l o r o m e t h a n e Di c h l o r o d i f l u o r o m e t h a n e (F r e o n 1 2 ) Et h a n o l Et h y l A c e t a t e He x a n e Is o p r o p a n o l Me t h y l e n e C h l o r i d e St y r e n e Tr i c h l o r o f l u o r o m e t h a n e (F r e o n 1 1 ) m& p - X y l e n e o- X y l e n e 200 53 7,900 8,800 NE 6,100 61,000 18,000 53,000 88,000 NE 8,800 8,800 SS-1 6 6 32 min 05/12/14 0.64 0.21J 1.7 4.2 19 2.4 27 7.7J 150 0.19J 11 0.23J <0.43 SS-2 6 6 37 min 05/12/14 0.69 0.19J 1.5 4.2 16 <0.36 23 7.4J 93 0.20J 11 0.23J <0.43 16 4.1 630 700 NE 490 4,900 1,400 3,400 7,000 NE 700 700 SS-3*6 6 2 min 05/02/17 NA NA NA NA NA NA NA NA NA NA NA NA NA Notes: DWM Residential SGSLs (February 2024) DWM Non-Residential SGSLs (February 2024) Sa m p l e I D Sa m p l i n g D a t e ( m m / d d / y y ) [µg/m3]Sl a b T h i c k n e s s [i n c h e s ] Sa m p l i n g D u r a t i o n 1 De p t h [i n c h e s b g s ] 1. Indicate "G" for grab sample or for longer samples indicate the number of hours followed by "h". 2. DWM SGLSs = Division of Waste Management Soil-Gas Sreening Levels. 3. BOLD = Concentration exceeds DWM Residential Soil-Gas Screening Levels. 4. NE = Not Established. 5. "J" flagged values are estimated concentrations. Other qualifications are detailed in the laboratory report. 6. NA = Not Analyzed. 7. * = Sample collected from property classified as residential land use. Other samples were collected from a property classified as non-residential. ADT 3 ADT 3(1) Page 2 of 2 Be n z e n e ci s - 1 , 2 - D i c h l o r o e t h y l e n e Et h y l b e n z e n e Me t h y l t e r t - b u t y l e t h e r (M T B E ) Na p h t h a l e n e Te t r a c h l o r o e t h y l e n e To l u e n e tr a n s - 1 , 2 - D i c h l o r o e t h y l e n e Tr i c h l o r o e t h y l e n e Vin y l c h l o r i d e Xy l e n e s ( t o t a l ) 1, 1 - D i c h l o r o e t h y l e n e Ac e t o n e Br o m o d i c h l o r o m e t h a n e 1, 3 - B u t a d i e n e 2- B u t a n o n e ( M E K ) 160 3,500 490 4,700 36 3,500 440,000 3,500 180 280 8,800 18,000 NE 33 41 440,000 NS-1*18 43 min 1/9/14 5.9 <0.40 2.1 3.8 7.7 1,700 11 <0.40 0.76 <0.26 7.4 <0.10 100 0.92 19 7.1J NS-2*18 33 min 1/9/14 33 <4.0 41 <3.6 6.3 26,000 240 <4.0 86 <2.6 173 <0.10 270 <6.7 <2.2 16J 12 280 37 360 2.8 280 35,000 280 14 5.6 700 1,400 NE 2.5 3.1 35,000 NS-3 13 34 min 1/9/14 11 <4.0 6.1 <3.6 <5.2 76,000 51 <4.0 45 <2.6 25.3 <0.10 100 <6.7 18 11J NS-4 17 33 min 5/13/14 NA 0.17J NA NA NA 130 NA 0.14J 1.1 <0.26 NA 0.48 NA NA NA NA NS-5 15 32 min 5/13/14 NA <4.0 NA NA NA 72,000 NA <4.0 32 <2.6 NA <4.0 NA NA NA NA NS-6 14 33 min 5/13/14 NA <0.40 NA NA NA 650 NA <0.40 12 <0.26 NA <0.40 NA NA NA NA NS-7 18 52 min 5/13/14 NA 19 NA NA NA 630 NA 0.98 110 0.11J NA <0.40 NA NA NA NA NS-8 20 39 min 5/13/14 NA 1.1 NA NA NA 550 NA <0.40 18 0.20J NA <0.40 NA NA NA NA NS-9 21 36 min 5/13/14 NA 6.6 NA NA NA 410 NA 1.1 71 <0.26 NA <0.40 NA NA NA NA NS-10 24 14 min 5/13/14 NA <0.40 NA NA NA 15 NA <0.40 0.16J <0.26 NA 0.33J NA NA NA NA NS-11 18 16 min 5/26/15 NA <1.25 NA NA NA 28,245 NA <1.24 58.5 NA NA NA NA NA NA NA NS-12 13 15 min 5/26/15 NA <1.02 NA NA NA 179 NA <1.20 <1.67 NA NA NA NA NA NA NA NS-13S 9 G 10/25/16 NA <4.0 NA NA NA 80 NA <8.0 <5.5 <2.6 NA NA NA NA NA NA NS-13D 15 G 10/25/16 NA <4.0 NA NA NA 100 NA <8.0 <5.5 <2.6 NA NA NA NA NA NA NS-14 9 G 10/25/16 NA <4.0 NA NA NA 76 NA <8.0 <5.5 <2.6 NA NA NA NA NA NA SGMP-1 5 G 1/10/20 NA <20 NA NA NA 3,300 NA <40 <27 <13 NA NA NA NA NA NA SGMP-2 5 G 1/10/20 NA <4.0 NA NA NA 640 NA <8.0 <5.5 <2.6 NA NA NA NA NA NA SGMP-3 5 G 1/10/20 NA <4.0 NA NA NA 680 NA <8.0 <5.5 <2.6 NA NA NA NA NA NA SGMP-4 5 G 1/10/20 NA <4.0 NA NA NA 12 NA <8.0 <5.5 <2.6 NA NA NA NA NA NA SGMP-5 5 G 1/10/20 NA <80 NA NA NA 60,000 NA <160 <110 <52 NA NA NA NA NA NA SGMP-6 5 G 1/10/20 NA <80 NA NA NA 25,000 NA <160 <110 <52 NA NA NA NA NA NA SGMP-7 5 G 1/10/20 NA <8.0 NA NA NA 2,900 NA <16 <11 <5.2 NA NA NA NA NA NA SGMP-8 5 G 1/10/20 NA <4.0 NA NA NA 520 NA <8.0 <5.5 <2.6 NA NA NA NA NA NA Notes: 1. * = Sample collected from property classified as non-residential land use. Other samples were collected from a property classified as residential. 2."J" flagged values are estimated concentrations. Other qualifications are detailed in the laboratory report. 3. NA = Not Analyzed 4. Indicate "G" for grab sample or for longer samples indicate the number of hours followed by "h" or minutes followed by "min". 5. DWM SGSLs = Division of Waste Management Soil-Gas Screening Levels 6. BOLD = Concentration exceeds DWM Residential SGSL 7. Italics = Concentration exceeds DWM Non-Residential SGSL. DWM Residential SGSLs (February 2024) DWM Non-Residential SGSLs (February 2024) Sa m p l e D u r a t i o n 1 Sa m p l e I D Sa m p l i n g D a t e ( m m / d d / y y ) De p t h [f e e t b g s ] [µg/m3] Table 4: Analytical Data for Soil Gas DSCA ID No.: DC920047 ADT 4 Page 1 of 3 Ca r b o n D i s u l f i d e Ch l o r o b e n z e n e Ch l o r o f o r m Cy c l o h e x a n e 1, 4 - D i c h l o r o b e n z e n e Dic h l o r o d i f l u o r o m e t h a n e (F r e o n 1 2 ) Et h a n o l Et h y l A c e t a t e 4- E t h y l t o l u e n e He p t a n e He x a n e 2- H e x a n o n e ( B E K ) Is o p r o p a n o l Me t h y l e n e C h l o r i d e 4- M e t h y l - 2 - p e n t a n o n e (M I B K ) Pr o p e n e Sty r e n e Te t r a h y d r o f u r a n 61,000 4,400 53 530,000 110 8,800 NE 6,100 NE 35,000 61,000 2,600 18,000 53,000 260,000 260,000 88,000 180,000 NS-1*18 43 min 1/9/14 2.2J 0.89 15 1.2 1.5 2.9 6.4J 3.4 0.62 11 26 2.7 7 2.1J 0.75 280 0.81 1 NS-2*18 33 min 1/9/14 <31 <4.6 <4.9 5.4 <6.0 <4.9 <75 <3.6 11 26 25J 4.1 11 8.1J <4.1 89 <4.3 6.1 4,900 350 4.1 42,000 8.5 700 NE 490 NE 2,800 4,900 210 1,400 3,400 21,000 21,000 7,000 14,000 NS-3 13 34 min 1/9/14 <31 <4.6 <4.9 <3.4 <6.0 17 <75 <3.6 <4.9 13 37J <4.1 5.4 8.3J <4.1 200 <4.3 <2.9 NS-4 17 33 min 5/13/14 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NS-5 15 32 min 5/13/14 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NS-6 14 33 min 5/13/14 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NS-7 18 52 min 5/13/14 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NS-8 20 39 min 5/13/14 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NS-9 21 36 min 5/13/14 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NS-10 24 14 min 5/13/14 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NS-11 18 16 min 5/26/15 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NS-12 13 15 min 5/26/15 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NS-13S 9 G 10/26/16 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NS-13D 15 G 10/26/16 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NS-14 9 G 10/26/16 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SGMP-1 5 G 1/10/20 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SGMP-2 5 G 1/10/20 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SGMP-3 5 G 1/10/20 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SGMP-4 5 G 1/10/20 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SGMP-5 5 G 1/10/20 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SGMP-6 5 G 1/10/20 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SGMP-7 5 G 1/10/20 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SGMP-8 5 G 1/10/20 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Notes: 1. * = Sample collected from property classified as non-residential land use. Other samples were collected from a property classified as residential. 2."J" flagged values are estimated concentrations. Other qualifications are detailed in the laboratory report. 3. NA = Not Analyzed 4. Indicate "G" for grab sample or for longer samples indicate the number of hours followed by "h" or minutes followed by "min". 5. DWM SGSLs = Division of Waste Management Soil-Gas Screening Levels 6. BOLD = Concentration exceeds DWM Residential SGSL 7. Italics = Concentration exceeds DWM Non-Residential SGSL. Sa m p l e D u r a t i o n 1 Sa m p l e I D De p t h [f e e t b g s ] DWM Residential SGSLs (February 2024) DWM Non-Residential SGSLs (February 2024) [µg/m3] Table 4(1): Analytical Data for Soil Gas (User Specified Chemicals) DSCA ID No.: DC920047 Sa m p l i n g D a t e ( m m / d d / y y ) ADT 4(1)ADT 4 Page 2 of 3 1, 1 , 1 - T r i c h l o r o e t h a n e Tr i c h l o r o f l u o r o m e t h a n e (F r e o n 1 1 ) 1, 1 , 2 - T r i c h l o r o - 1 , 2 , 2 - tr i f l u o r o e t h a n e ( F r e o n 11 3 ) 1, 2 , 4 - T r i m e t h y l b e n z e n e 1, 3 , 5 - T r i m e t h y l b e n z e n e Vin y l A c e t a t e m& p - X y l e n e s o- X y l e n e 440,000 NE 440,000 5,300 5,300 18,000 8,800 8,800 NS-1*18 43 min 1/9/14 0.81 28 370 1.7 0.56 3.8J 5.3 2.1 NS-2*18 33 min 1/9/14 <5.5 36 340 31 8.8 140 130 43 35,000 NE 35,000 420 420 1,400 700 700 NS-3 13 34 min 1/9/14 <5.5 <5.6 910 <4.9 <4.9 15J 19 6.3 NS-4 17 33 min 5/13/14 NA NA NA NA NA NA NA NA NS-5 15 32 min 5/13/14 NA NA NA NA NA NA NA NA NS-6 14 33 min 5/13/14 NA NA NA NA NA NA NA NA NS-7 18 52 min 5/13/14 NA NA NA NA NA NA NA NA NS-8 20 39 min 5/13/14 NA NA NA NA NA NA NA NA NS-9 21 36 min 5/13/14 NA NA NA NA NA NA NA NA NS-10 24 14 min 5/13/14 NA NA NA NA NA NA NA NA NS-11 18 16 min 5/26/15 NA NA NA NA NA NA NA NA NS-12 13 15 min 5/26/15 NA NA NA NA NA NA NA NA NS-13S 9 G 10/26/16 NA NA NA NA NA NA NA NA NS-13D 15 G 10/26/16 NA NA NA NA NA NA NA NA NS-14 9 G 10/26/16 NA NA NA NA NA NA NA NA SGMP-1 5 G 1/10/20 NA NA NA NA NA NA NA NA SGMP-2 5 G 1/10/20 NA NA NA NA NA NA NA NA SGMP-3 5 G 1/10/20 NA NA NA NA NA NA NA NA SGMP-4 5 G 1/10/20 NA NA NA NA NA NA NA NA SGMP-5 5 G 1/10/20 NA NA NA NA NA NA NA NA SGMP-6 5 G 1/10/20 NA NA NA NA NA NA NA NA SGMP-7 5 G 1/10/20 NA NA NA NA NA NA NA NA SGMP-8 5 G 1/10/20 NA NA NA NA NA NA NA NA Notes: 1. * = Sample collected from property classified as non-residential land use. Other samples were collected from a property classified as residential. 2."J" flagged values are estimated concentrations. Other qualifications are detailed in the laboratory report. 3. NA = Not Analyzed 4. Indicate "G" for grab sample or for longer samples indicate the number of hours followed by "h" or minutes followed by "min". 5. DWM SGSLs = Division of Waste Management Soil Gas Screening Levels 6. Bold = Concentration exceeds DWM Residential SGSL 7. Italics = Concentration exceeds DWM Non-Residential SGSL. DWM Residential SGSLs (February 2024) DWM Non-Residential SGSLs (February 2024) Sa m p l e I D De p t h [f e e t b g s ] Sa m p l e D u r a t i o n 1 Sa m p l i n g D a t e ( m m / d d / y y ) [µg/m3] Table 4(1): Analytical Data for Soil Gas (User Specified Chemicals) DSCA ID No.: DC920047 ADT 4(2)ADT 4(1) Page 3 of 3 Table 5: Analytical Data for Indoor and Outdoor Air DSCA ID No.: DC920047 Be n z e n e cis - 1 , 2 - D i c h l o r o e t h y l e n e Et h y l b e n z e n e Me t h y l t e r t - b u t y l e t h e r (M T B E ) Na p h t h a l e n e Te t r a c h l o r o e t h y l e n e To l u e n e tr a n s - 1 , 2 - D i c h l o r o e t h y l e n e Tr i c h l o r o e t h y l e n e Vi n y l c h l o r i d e Xy l e n e s ( t o t a l ) 1.6 35 4.9 47 0.36 35 4,400 35 1.8 2.8 88 AA-1 05/12/14 P 13d 22h 36min NA <0.16 NA NA NA <0.084 NA <0.16 <0.072 <0.22 NA AA-2 05/12/14 P 13d 22h 25min NA <0.16 NA NA NA <0.084 NA <0.16 <0.072 <0.22 NA IA-1 05/12/14 C P 13d 23h 17min NA <0.16 NA NA NA 0.32 NA <0.16 <0.072 <0.22 NA IA-2 05/12/14 C P 13d 23h 15min NA <0.16 NA NA NA 0.32 NA <0.16 <0.072 <0.22 NA 0.36 8.3 1.1 11 0.083 8.3 1,000 8.3 0.42 0.17 21 AA-3 09/11/14 P 13d 21h 42min NA <0.0498 NA NA NA 0.0694 NA <0.0514 <0.0594 <0.0412 NA AA-4 09/11/14 P 13d 20h 59min NA <0.0449 NA NA NA 0.0419J NA <0.0515 <0.0595 <0.0413 NA IA-3 09/11/14 R P 13d 21h 48min NA <0.0498 NA NA NA 3.62 NA <0.0513 0.0156J <0.0412 NA IA-4 09/11/14 R P 13d 21h 44min NA <0.0498 NA NA NA 3.22 NA <0.0513 <0.0593 <0.0412 NA IA-5 09/11/14 R P 13d 21h 37 min NA <0.0498 NA NA NA 0.290 NA <0.0514 <0.0594 <0.0412 NA IA-6 09/11/14 R P 13d 21h 35min NA <0.0498 NA NA NA 78.1 NA <0.0514 0.0203J <0.0412 NA IA-7 09/11/14 R P 13d 21h 25min NA <0.0499 NA NA NA 0.131 NA <0.0514 0.0333J <0.0412 NA IA-8 09/11/14 R P 13d 21h 21min NA <0.0499 NA NA NA 0.296 NA <0.0514 0.0334J <0.0412 NA IA-10 09/11/14 R P 13d 21h 17min NA <0.0499 NA NA NA 2.54 NA <0.0514 0.0126J <0.0412 NA IA-11 09/11/14 R P 13d 21h 13min NA <0.0499 NA NA NA 0.280 NA <0.0514 0.79241 <0.0413 NA IA-12 09/11/14 R P 13d 21h 13min NA <0.0499 NA NA NA 1.47 NA <0.0514 0.0221J <0.0413 NA IA-13 09/11/14 R P 13d 21h 10min NA <0.0499 NA NA NA 0.148 NA <0.0514 <0.0595 <0.0413 NA IA-14 09/11/14 R P 13d 21h 2min NA <0.0499 NA NA NA 0.097 NA <0.0515 0.0136J <0.0413 NA IA-15 09/11/14 R P 13d 21h 2min NA <0.0499 NA NA NA 0.125 NA <0.0515 <0.0595 <0.0413 NA IA-16 01/20/15 R P 3d 1h 18min NA <0.0439 NA NA NA 23.7 NA <0.0391 0.0818J <0.0371 NA IA-17 10/01/15 R P (Radiello)14d NA <0.0505 NA NA NA 0.397 NA <0.051 0.0201 m,J <0.0409 NA IA-17 10/01/15 R P (sorbent tube)14d NA NA NA NA NA 0.28J NA NA <0.53 NA NA IA-18 10/01/15 R P (Radiello)14d NA <0.0504 NA NA NA 3.01 NA <0.0509 0.0429J <0.0408 NA IA-18 10/01/15 R P (sorbent tube)14d NA NA NA NA NA 1.78 NA NA <0.53 NA NA IA-19 10/01/15 R P (Radiello)14d NA <0.0504 NA NA NA 8.45 NA <0.0509 0.0236J <0.0408 NA IA-19 10/01/15 R P (sorbent tube)14d NA NA NA NA NA 5.18 NA NA <0.53 NA NA IA-20 06/17/16 R P (Radiello)7d NA <0.0233 NA NA NA 0.255 NA <0.0141 <0.0172 <0.0116 NA IA-21 06/17/16 R P (Radiello)7d NA <0.0233 NA NA NA 0.339 NA <0.0141 0.0324J <0.0116 NA IA-22 06/17/16 R P (Radiello)7d NA <0.0233 NA NA NA 40.7 NA <0.0141 0.0395J <0.0116 NA IA-23 06/17/16 R P (Radiello)7d NA <0.0233 NA NA NA 0.174 NA <0.0141 0.337 <0.0116 NA IA-24 04/25/17 R P (Radiello)7d NA <0.0103 NA NA NA 12.3 NA <0.0103 0.0406 m,J <0.0831 NA Notes: 1. Indicate "F" for former or current dry-cleaning facility, "AD" for adjacent space, "R" for residence, "C" for commercial not adjacent space. If sample was taken outdoors, leave blank. 2. Indicate "SU" for summa canister, "FC" for flux chambers, "T" for tedlar bags, "P" for passive samplers, "O" for other. 3. Indicate "8h" for 8-hour, "24h" for 24-hour, "G" for grab sample, for other hours indicate the number of hours followed by "h" or "d" for days. 6. BOLD = Concentration exceeds DWM Residential Indoor Air Screening Levels. 5. NA = Not Analyzed, NE = Not Established. 6. m = Manual integration performed on peak due to improper integration by chromatography data system. 7. J = Estimated value below laboratory calibration range. DWM Residential IASLs (February 2024) DWM Non-Residential IASLs (February 2024) Sa m p l e I D Sa m p l i n g D a t e ( m m / d d / y y ) [µg/m3]Sa m p l e L o c a t i o n 1 Sa m p l i n g D u r a t i o n 3 Sa m p l i n g M e t h o d 2 ADT 5 Page 1 of 1 Attachment: Apartment units associated with the Southridge Apartment Homes are located approximately 130 to 500 feet north and east of the former dry-cleaner. Sampling location map that indicates where all indoor air samples were collected. The map should clearly indicate the names/types of businesses and residence names sampled and in the vicinity of the subject site that may be of concern. The former dry-cleaning building has been demolished and a Valero Gas Station is currently present on the source property. The gas station building has an individual HVAC system. For any other indoor spaces tested, describe the type and location of the air handling/HVAC unit (for example - a shared unit supplying two adjacent spaces; unit located on the roof): Each apartment in the Southridge Apartment Homes has an individual HVAC system. For any other indoor spaces tested, describe the type and location of the air handling/HVAC unit (for example - a shared unit supplying two adjacent spaces; unit located on the roof): Table 5(2): Additional Data for Indoor and Outdoor Air DSCA ID No.: DC920047 Is dry-cleaning facility at the site: Operating Pick-up Only Abandoned If facility is operating, solvents used are: Perc Petroleum Green Earth Other For the active or former dry-cleaning space, describe the type and location of the air handling/HVAC unit (for example - a shared unit supplying two adjacent spaces; unit located on the roof): ADT 5(1)ADT 5(2) Page 1 of 1 Sample ID Name and Address for Sampling Location Property Owner Name, Address, and Phone Number Tenant Name, Address, and Phone Number AA-1 AA-2 Valero Gas Station 1965 Rock Quarry Road, Raleigh, NC 27612 Noble Hospitality Inc. 7408 Siemens Road, Wendell, NC 27591 (919) 749-6660 Not applicable - outdoor air sample AA-3 AA-4 South Ridge Apartment Homes 1620 Proctor Road, Raleigh, NC 27612 Fountain Drive, LLC Randal Bryant, Drucker & Faulk (agent for owner) 1618 Fountain Drive, Raleigh, NC 27610 (919) 846-7300 Not applicable - outdoor air sample IA-1 IA-2 Valero Gas Station 1965 Rock Quarry Road, Raleigh, NC 27612 Noble Hospitality Inc. 7408 Siemens Road, Wendell, NC 27591 (919)749-6660 Valero Gas Station 1965 Rock Quarry Road, Raleigh, NC 27612 (919) 829-9400 IA-3 South Ridge Apartment Homes 1622 Proctor Road, Raleigh, NC 27612 Fountain Drive, LLC Randal Bryant, Drucker & Faulk (agent for owner) 1618 Fountain Drive, Raleigh, NC 27610 (919) 846-7300 South Ridge Apartment Homes 1622 Proctor Road, Raleigh, NC 27612 (919) 829-1705 IA-4 South Ridge Apartment Homes 1620 Proctor Road, Raleigh, NC 27612 Fountain Drive, LLC Randal Bryant, Drucker & Faulk (agent for owner) 1618 Fountain Drive, Raleigh, NC 27610 (919) 846-7300 South Ridge Apartment Homes 1622 Proctor Road, Raleigh, NC 27612 (919) 829-1705 IA-5 IA-17 South Ridge Apartment Homes 1626 Proctor Road, Raleigh, NC 27612 Fountain Drive, LLC Randal Bryant, Drucker & Faulk (agent for owner) 1618 Fountain Drive, Raleigh, NC 27610 (919) 846-7300 South Ridge Apartment Homes 1622 Proctor Road, Raleigh, NC 27612 (919) 829-1705 IA-6 IA-16 IA-22 IA-24 South Ridge Apartment Homes 1628 Proctor Road, Raleigh, NC 27612 Fountain Drive, LLC Randal Bryant, Drucker & Faulk (agent for owner) 1618 Fountain Drive, Raleigh, NC 27610 (919) 846-7300 South Ridge Apartment Homes 1622 Proctor Road, Raleigh, NC 27612 (919) 829-1705 IA-7 South Ridge Apartment Homes 1632 Proctor Road, Raleigh, NC 27612 Fountain Drive, LLC Randal Bryant, Drucker & Faulk (agent for owner) 1618 Fountain Drive, Raleigh, NC 27610 (919) 846-7300 South Ridge Apartment Homes 1622 Proctor Road, Raleigh, NC 27612 (919) 829-1705 IA-8 IA-23 South Ridge Apartment Homes 1634 Proctor Road, Raleigh, NC 27612 Fountain Drive, LLC Randal Bryant, Drucker & Faulk (agent for owner) 1618 Fountain Drive, Raleigh, NC 27610 (919) 846-7300 South Ridge Apartment Homes 1622 Proctor Road, Raleigh, NC 27612 (919) 829-1705 IA-10 South Ridge Apartment Homes 1613 Proctor Road, Raleigh, NC 27612 Fountain Drive, LLC Randal Bryant, Drucker & Faulk (agent for owner) 1618 Fountain Drive, Raleigh, NC 27610 (919) 846-7300 South Ridge Apartment Homes 1622 Proctor Road, Raleigh, NC 27612 (919) 829-1705 Table 5(3): Additional Data for Indoor and Outdoor Air DSCA ID No.: DC920047 ADT 5(3) Page 1 of 2 Sample ID Name and Address for Sampling Location Property Owner Name, Address, and Phone Number Tenant Name, Address, and Phone Number Table 5(3): Additional Data for Indoor and Outdoor Air DSCA ID No.: DC920047 ADT 5(3) IA-11 South Ridge Apartment Homes 1609 Proctor Road, Raleigh, NC 27612 Fountain Drive, LLC Randal Bryant, Drucker & Faulk (agent for owner) 1618 Fountain Drive, Raleigh, NC 27610 (919) 846-7300 South Ridge Apartment Homes 1622 Proctor Road, Raleigh, NC 27612 (919) 829-1705 IA-12 IA-20 South Ridge Apartment Homes 1607 Proctor Road, Raleigh, NC 27612 Fountain Drive, LLC Randal Bryant, Drucker & Faulk (agent for owner) 1618 Fountain Drive, Raleigh, NC 27610 (919) 846-7300 South Ridge Apartment Homes 1622 Proctor Road, Raleigh, NC 27612 (919) 829-1705 IA-13 South Ridge Apartment Homes 1601 Proctor Road, Raleigh, NC 27612 Fountain Drive, LLC Randal Bryant, Drucker & Faulk (agent for owner) 1618 Fountain Drive, Raleigh, NC 27610 (919) 846-7300 South Ridge Apartment Homes 1622 Proctor Road, Raleigh, NC 27612 (919) 829-1705 IA-14 South Ridge Apartment Homes 1955 Rock Quarry Road, Raleigh, NC 27612 Fountain Drive, LLC Randal Bryant, Drucker & Faulk (agent for owner) 1618 Fountain Drive, Raleigh, NC 27610 (919) 846-7300 South Ridge Apartment Homes 1622 Proctor Road, Raleigh, NC 27612 (919) 829-1705 IA-15 South Ridge Apartment Homes 1953 Rock Quarry Road, Raleigh, NC 27612 Fountain Drive, LLC Randal Bryant, Drucker & Faulk (agent for owner) 1618 Fountain Drive, Raleigh, NC 27610 (919) 846-7300 South Ridge Apartment Homes 1622 Proctor Road, Raleigh, NC 27612 (919) 829-1705 IA-18 South Ridge Apartment Homes 1830 Liberty Place, Raleigh, NC 27612 Fountain Drive, LLC Randal Bryant, Drucker & Faulk (agent for owner) 1618 Fountain Drive, Raleigh, NC 27610 (919) 846-7300 South Ridge Apartment Homes 1622 Proctor Road, Raleigh, NC 27612 (919) 829-1705 IA-19 IA-21 South Ridge Apartment Homes 1832 Liberty Place, Raleigh, NC 27612 Fountain Drive, LLC Randal Bryant, Drucker & Faulk (agent for owner) 1618 Fountain Drive, Raleigh, NC 27610 (919) 846-7300 South Ridge Apartment Homes 1622 Proctor Road, Raleigh, NC 27612 (919) 829-1705 Page 2 of 2 Table 6: Monitoring Well Construction Data DSCA ID No.: DC920047 Well ID Date Installed (mm/dd/yy)Number of Samples Well Depth [feet] Well Diameter [inch] Screen Interval [feet] Status (Active/Inactive) MW-1 09/19/13 5 35 2 20-35 Active MW-2 01/09/14 4 33 2 23-33 Active MW-3 01/09/14 1 35 2 25-35 Active MW-4 01/09/14 1 24 2 14-24 Active MW-5 01/09/14 4 33 2 23-33 Active MW-6 01/09/14 1 30 2 20-30 Active MW-7 01/16/15 4 36 2 26-36 Active MW-8 01/16/15 4 35 2 25-35 Active ADT 6 Page 1 of 1 Table 7: Groundwater Elevation Data DSCA ID No.: DC920047 Groundwater Sampling Point Sampling Date (mm/dd/yy) TOC Elevation [feet] Depth to Water [feet bgs] Groundwater Elevation [feet] Depth to NAPL [feet bgs] NAPL Thickness [feet] Corrected* Groundwater Elevation [feet] 01/13/14 26.28 67.59 NA NA NA 02/13/15 24.23 69.64 NA NA NA 10/20/17 19.90 73.97 NA NA NA 03/03/21 17.53 76.34 NA NA NA 02/15/24 23.40 70.47 NA NA NA 01/13/14 24.21 71.19 NA NA NA 02/13/15 22.29 73.11 NA NA NA 10/20/17 22.65 72.75 NA NA NA 03/03/21 19.12 76.28 NA NA NA 02/15/24 22.04 73.36 NA NA NA 01/13/14 30.59 71.90 NA NA NA 02/13/15 28.66 73.83 NA NA NA 10/20/17 28.82 73.67 NA NA NA 03/03/21 25.45 77.04 NA NA NA 02/15/24 28.36 74.13 NA NA NA 01/13/14 18.61 63.94 NA NA NA 02/13/15 16.60 65.95 NA NA NA 10/20/17 18.21 64.34 NA NA NA 03/03/21 13.26 69.29 NA NA NA 02/15/24 17.33 65.22 NA NA NA 01/13/14 23.77 70.07 NA NA NA 02/13/15 21.33 72.51 NA NA NA 10/20/17 21.80 72.04 NA NA NA 03/03/21 18.18 75.66 NA NA NA 02/15/24 21.08 72.76 NA NA NA 01/13/14 21.42 67.05 NA NA NA 02/13/15 19.30 69.17 NA NA NA 10/20/17 20.55 67.92 NA NA NA 03/03/21 15.72 72.75 NA NA NA 02/15/24 19.69 68.78 NA NA NA 01/20/15 19.84 65.50 NA NA NA 02/13/15 19.60 65.74 NA NA NA 10/20/17 20.44 64.90 NA NA NA 03/03/21 16.61 68.73 NA NA NA 02/15/24 20.52 64.82 NA NA NA 01/20/15 27.72 44.12 NA NA NA 02/13/15 24.31 47.53 NA NA NA 10/20/17 27.40 44.44 NA NA NA 03/03/21 20.93 50.91 NA NA NA 02/15/24 26.54 45.30 NA NA NA Notes: 88.47MW-6 MW-1 MW-2 95.40 93.87 93.84MW-5 MW-4 82.55 MW-3 102.49 NA = Not Applicable bgs = below ground surface MW-8 71.84 MW-7 85.34 ADT 7 Page 1 of 1 Table 8: Analytical Data for Groundwater DSCA ID No.: DC920047 Be n z e n e cis - 1 , 2 - D i c h l o r o e t h y l e n e Eth y l b e n z e n e Me t h y l t e r t - b u t y l e t h e r (M T B E ) Na p h t h a l e n e Te t r a c h l o r o e t h y l e n e To l u e n e tr a n s - 1 , 2 - D i c h l o r o e t h y l e n e Tr i c h l o r o e t h y l e n e Vi n y l c h l o r i d e Xy l e n e s ( t o t a l ) 1, 2 , 4 - T r i m e t h y l b e n z e n e 1, 3 , 5 - T r i m e t h y l b e n z e n e 4- I s o p r o p y l t o l u e n e Ac e t o n e C5 - C 8 A l i p h a t i c s C9 - C 1 0 A r o m a t i c s C9 - C 1 2 A l i p h a t i c s 0.001 0.07 0.6 0.02 0.006 0.0007 0.6 0.1 0.003 0.00003 0.5 0.4 0.4 NE 6 0.4 0.2 0.7 GW-1 01/06/14 <0.001 <0.001 <0.001 NA NA <0.0007 <0.001 <0.001 <0.001 <0.001 <0.003 NA NA NA NA NA NA NA GW-2 01/06/14 <0.001 <0.001 <0.001 NA NA <0.0007 <0.001 <0.001 <0.001 <0.001 <0.003 NA NA NA NA NA NA NA GW-3 01/06/14 0.001J <0.001 <0.001 NA NA 0.0006 <0.001 <0.001 <0.001 <0.001 <0.003 NA NA NA NA NA NA NA GW-4 01/06/14 0.0032 <0.001 <0.001 NA NA 0.0028 0.003 <0.001 <0.001 <0.001 0.0018 NA NA NA NA NA NA NA GW-5 01/07/14 <0.001 <0.001 <0.001 NA NA <0.0007 <0.001 <0.001 <0.001 <0.001 <0.003 NA NA NA NA NA NA NA GW-6 01/07/14 <0.001 <0.001 <0.001 NA NA <0.0007 <0.001 <0.001 <0.001 <0.001 <0.003 NA NA NA NA NA NA NA GW-7 01/07/14 0.52 <0.1 0.81 NA NA <0.07 3.7 <0.1 <0.1 <0.1 6.5 NA NA NA NA NA NA NA GW-8 01/07/14 0.0006J 0.001 <0.001 NA NA 0.0034 <0.001 <0.001 0.0009J <0.001 0.008J NA NA NA NA NA NA NA GW-9 01/08/14 <0.001 <0.001 <0.001 NA NA 0.0015 <0.001 <0.001 <0.001 <0.001 <0.003 NA NA NA NA NA NA NA GW-10 01/08/14 0.0007J <0.001 <0.001 NA NA <0.0007 <0.001 <0.001 <0.001 <0.001 <0.003 NA NA NA NA NA NA NA GW-11 01/08/14 <0.001 <0.001 <0.001 NA NA 0.0073 <0.001 <0.001 <0.001 <0.001 <0.003 NA NA NA NA NA NA NA GW-13 01/08/14 <0.001 <0.001 <0.001 NA NA 0.0006J <0.001 <0.001 <0.001 <0.001 <0.003 NA NA NA NA NA NA NA GW-15 01/09/14 <0.0005 <0.0005 <0.0005 <0.0005 <0.001 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.003 <0.0005 <0.0005 <0.0005 <0.0050 NA NA NA TMW-1 07/13/12 <0.0005 <0.0005 <0.0005 0.000450J 0.000190J <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.0015 <0.0005 <0.0005 <0.0005 NA NA NA NA TMW-2 07/13/12 0.082 <0.002 0.0052 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 <0.002 0.0188 0.0134 0.00112J 0.000320J NA NA NA NA TMW-3 07/13/12 4.91 <0.8 0.992 25.3 0.240J <0.8 4.77 <0.8 <0.8 <0.8 6.590 0.976 0.256J <0.8 NA 42.5 6.4 25.9 TMW-4 07/13/12 0.000140J 0.000190J <0.0005 0.00507 <0.0005 0.00175 <0.0005 <0.0005 0.000390J <0.0005 <0.0015 <0.0005 <0.0005 <0.0005 NA NA NA NA TMW-5 07/13/12 <0.0005 <0.0005 <0.0005 0.000240J <0.0005 0.00075 <0.0005 <0.0005 <0.0005 <0.0005 <0.0015 <0.0005 <0.0005 <0.0005 NA NA NA NA Sa m p l i n g D a t e ( m m / d d / y y ) [mg/L] Temporary Groundwater Monitoring Wells NC 2L Standard Gr o u n d w a t e r S a m p l i n g P o i n t Groundwater Grab Samples ADT 8 Page 1 of 6 Table 8: Analytical Data for Groundwater DSCA ID No.: DC920047 Be n z e n e cis - 1 , 2 - D i c h l o r o e t h y l e n e Eth y l b e n z e n e Me t h y l t e r t - b u t y l e t h e r (M T B E ) Na p h t h a l e n e Te t r a c h l o r o e t h y l e n e To l u e n e tr a n s - 1 , 2 - D i c h l o r o e t h y l e n e Tr i c h l o r o e t h y l e n e Vi n y l c h l o r i d e Xy l e n e s ( t o t a l ) 1, 2 , 4 - T r i m e t h y l b e n z e n e 1, 3 , 5 - T r i m e t h y l b e n z e n e 4- I s o p r o p y l t o l u e n e Ac e t o n e C5 - C 8 A l i p h a t i c s C9 - C 1 0 A r o m a t i c s C9 - C 1 2 A l i p h a t i c s 0.001 0.07 0.6 0.02 0.006 0.0007 0.6 0.1 0.003 0.00003 0.5 0.4 0.4 NE 6 0.4 0.2 0.7 Sa m p l i n g D a t e ( m m / d d / y y ) [mg/L] NC 2L Standard Gr o u n d w a t e r S a m p l i n g P o i n t ADT 8 9/19/2013 13.6 <0.5 3.12 37.1 0.655 <0.5 22.3 <0.5 <0.5 <0.5 20 2.57 0.646 <0.5 NA NA NA NA 01/06/14 3.2 <0.001 0.22 NA NA <0.0007 1.8 <0.001 <0.001 <0.001 1.52 NA NA NA NA NA NA NA 02/03/14 15 <0.050 3.1 48 1.4 <0.050 28 <0.050 <0.050 <0.050 20 3.0 0.76 <0.050 0.65 NA NA NA 1/23/2015 14.5 <0.5 3.35 48.1 0.716 <0.5 27.7 <0.5 <0.5 <0.5 24.4 3.16 0.711 <0.5 NA NA NA NA 8/15/2016 11.3 <0.5 2.61 40.6 0.638 <0.5 24.9 <0.5 <0.5 <0.5 18.3 1.86 0.542 <0.5 NA NA NA NA 01/13/14 <0.0005 <0.0005 <0.0005 <0.0005 <0.0010 0.0032 <0.0005 <0.0005 0.013 <0.0005 <0.003 <0.0005 <0.0005 <0.0005 <0.0050 NA NA NA 10/20/17 <0.001 <0.001 <0.001 <0.001 <0.002 0.0014 <0.001 <0.001 <0.001 <0.002 <0.002 <0.001 <0.001 <0.001 <0.05 NA NA NA 03/03/21 <0.000500 <0.000500 <0.000500 <0.000500 <0.00250 0.000654 <0.000500 <0.000500 <0.000500 <0.000500 <0.00150 <0.000500 <0.000500 <0.000500 <0.0250 NA NA NA 02/15/24 <0.000500 <0.000500 <0.000500 <0.000500 <0.00250 0.00103 <0.000500 <0.000500 <0.000500 <0.000500 <0.00150 <0.000500 <0.000500 <0.000500 <0.0250 NA NA NA MW-3 01/13/14 <0.0005 <0.0005 <0.0005 <0.0005 <0.0010 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.003 <0.0005 <0.0005 <0.0005 <0.0050 NA NA NA MW-4 01/13/14 <0.0005 <0.0005 <0.0005 <0.0005 <0.0010 0.0065 <0.0005 <0.0005 <0.0005 <0.0005 <0.003 <0.0005 <0.0005 <0.0005 0.027 NA NA NA 01/13/14 <0.0005 0.011 <0.0005 0.00078 <0.0010 0.021 <0.0005 <0.0005 0.0082 <0.0005 <0.003 <0.0005 <0.0005 <0.0005 <0.0050 NA NA NA 10/20/17 <0.001 0.00066J <0.001 0.0011 <0.002 0.002 <0.001 <0.001 0.00067J <0.002 <0.002 <0.001 <0.001 <0.001 <0.05 NA NA NA 03/03/21 <0.000500 <0.000500 <0.000500 0.00079 <0.00250 0.00102 <0.000500 <0.000500 0.000203J <0.000500 <0.00150 <0.000500 <0.000500 <0.000500 <0.0250 NA NA NA 02/15/24 <0.000500 <0.000500 <0.000500 0.000731 <0.00250 0.000449J <0.000500 <0.000500 <0.000500 <0.000500 <0.00150 <0.000500 <0.000500 <0.000500 <0.0250 NA NA NA MW-6 01/13/14 <0.0005 <0.0005 <0.0005 0.00083 <0.0010 <0.0005 <0.0005 <0.0005 <0.0005 <0.0005 <0.003 <0.0005 <0.0005 <0.0005 0.24 NA NA NA 01/20/15 <0.0005 <0.0005 <0.0005 0.00058 <0.0010 0.11 <0.0005 <0.0005 0.00076 <0.00050 <0.0015 <0.0005 <0.0005 <0.0005 <0.005 NA NA NA 10/20/17 <0.001 <0.001 <0.001 0.00043J <0.002 0.045 <0.001 <0.001 0.00046J <0.002 <0.002 <0.001 <0.001 <0.001 <0.05 NA NA NA 03/03/21 <0.000500 <0.000500 <0.000500 0.000297 <0.00250 0.0708 <0.000500 <0.000500 0.000416J <0.000500 <0.00150 <0.000500 <0.000500 <0.000500 <0.0250 NA NA NA 02/15/24 <0.000500 <0.000500 <0.000500 0.000521 <0.00250 0.0311 <0.000500 <0.000500 0.000206J <0.000500 <0.00150 <0.000500 <0.000500 <0.000500 <0.0250 NA NA NA 01/20/15 <0.0005 <0.0005 <0.0005 <0.0005 <0.0010 0.0075 <0.0005 <0.0005 <0.0005 <0.0005 0.0017 0.0066 01/00/00 <0.0005 <0.005 NA NA NA 10/20/17 <0.001 <0.001 <0.001 <0.001 <0.002 0.0032 <0.001 <0.001 <0.001 <0.002 <0.002 <0.001 <0.001 <0.001 <0.05 NA NA NA 03/03/21 <0.000500 <0.000500 <0.000500 <0.000500 <0.00250 0.00238 <0.000500 <0.000500 <0.000500 <0.000500 <0.00150 <0.000500 <0.000500 <0.000500 <0.0250 NA NA NA 02/15/24 <0.000500 <0.000500 <0.000500 <0.000500 <0.00250 0.00238 <0.000500 <0.000500 <0.000500 <0.000500 <0.00150 <0.000500 <0.000500 <0.000500 <0.0250 NA NA NA Permanent Groundwater Monitoring Wells MW-1 MW-2 MW-5 MW-7 MW-8 Page 2 of 6 Table 8: Analytical Data for Groundwater DSCA ID No.: DC920047 Be n z e n e cis - 1 , 2 - D i c h l o r o e t h y l e n e Eth y l b e n z e n e Me t h y l t e r t - b u t y l e t h e r (M T B E ) Na p h t h a l e n e Te t r a c h l o r o e t h y l e n e To l u e n e tr a n s - 1 , 2 - D i c h l o r o e t h y l e n e Tr i c h l o r o e t h y l e n e Vi n y l c h l o r i d e Xy l e n e s ( t o t a l ) 1, 2 , 4 - T r i m e t h y l b e n z e n e 1, 3 , 5 - T r i m e t h y l b e n z e n e 4- I s o p r o p y l t o l u e n e Ac e t o n e C5 - C 8 A l i p h a t i c s C9 - C 1 0 A r o m a t i c s C9 - C 1 2 A l i p h a t i c s 0.001 0.07 0.6 0.02 0.006 0.0007 0.6 0.1 0.003 0.00003 0.5 0.4 0.4 NE 6 0.4 0.2 0.7 Sa m p l i n g D a t e ( m m / d d / y y ) [mg/L] NC 2L Standard Gr o u n d w a t e r S a m p l i n g P o i n t ADT 8 1/23/2015 <0.00017 <0.0005 <0.00050 0.0093 <0.00050 0.0061 <0.00050 <0.0005 0.00058 <0.0005 <0.0015 <0.00050 <0.00050 <0.0005 NA NA NA NA 8/15/2016 <0.00050 <0.0005 <0.00050 0.0036 <0.00050 0.0059 <0.00050 <0.0005 0.00029J <0.0005 <0.0015 <0.00050 <0.00050 <0.0005 NA NA NA NA 1/23/2015 0.138 0.0011J <0.0025 0.0273 <0.0025 0.0021J <0.0025 <0.0025 <0.0025 <0.0025 0.0283 0.0032 <0.0025 <0.0025 NA NA NA NA 8/15/2016 0.386 0.0015J <0.0050 0.0647 0.0014J 0.0037J <0.00050 <0.005 0.0016J <0.005 0.0588 0.0104 <0.00050 <0.005 NA NA NA NA 1/23/2015 0.0355 <0.0025 <0.0025 0.214 0.0012J 0.0024J <0.0025 <0.0025 <0.0025 <0.0025 0.0305 0.0067 <0.0025 <0.0025 NA NA NA NA 8/15/2016 1 <0.005 <0.0050 3.16 0.0822 0.0041J 0.0024J <0.005 <0.0050 <0.005 0.36 0.18 0.0018J <0.005 NA NA NA NA 1/23/2015 18.4 <0.5 3.57 26.4 0.54 <0.50 24.6 <0.5 <0.50 <0.5 22.5 2.89 0.736 <0.5 NA NA NA NA 8/15/2016 17.2 <0.25 3.47 7.7 0.725 <0.025 16 <0.25 <0.25 <0.25 21.5 2.45 0.638 <0.25 NA NA NA NA 1/23/2015 8.09 <0.1 0.0473J 5.01 0.516 0.039J 0.0605J <0.1 <0.1 <0.1 0.129J 0.0535J <0.1 <0.1 NA NA NA NA 8/15/2016 7.23 <0.1 0.0307J 1.22 0.701 <0.1 0.129 <0.1 <0.1 <0.1 <0.300 <0.1 <0.1 <0.1 NA NA NA NA 1/23/2015 5.26 <0.1 <0.1 6.34 0.379 0.0359J 0.12 <0.1 <0.1 <0.1 0.125J <0.1 0.0791J <0.1 NA NA NA NA 8/15/2016 1.48 <0.025 <0.025 1.89 0.156 0.0948 0.0163J <0.025 0.0329 <0.025 0.018J <0.025 0.0067J <0.025 NA NA NA NA 8/20/2015 4.09 <0.05 0.0244J 3.53 0.277 0.0388J <0.00050 <0.05 <0.050 <0.05 0.225 0.0871 <0.00050 <0.05 NA NA NA NA 8/15/2016 0.7 <0.005 <0.0050 0.583 0.0467 0.0377 <0.00050 <0.005 <0.0050 <0.005 0.0114J 0.0039J <0.00050 <0.005 NA NA NA NA 8/20/2015 0.0137 <0.0005 <0.00050 0.007 0.00032J 0.0331 <0.00050 <0.0005 <0.00050 <0.0005 0.00062J <0.00050 <0.00050 <0.0005 NA NA NA NA 8/15/2016 <0.00050 <0.0005 <0.00050 <0.00050 <0.00050 0.0351 <0.00050 <0.0005 <0.00050 <0.0005 <0.0015 <0.00050 <0.00050 <0.0005 NA NA NA NA 8/20/2015 0.00026J <0.0005 <0.00050 <0.00050 <0.00050 0.0152 <0.00050 <0.0005 0.00017J <0.0005 <0.0015 <0.00050 <0.00050 <0.0005 NA NA NA NA 8/15/2016 <0.00050 <0.0005 <0.00050 <0.00050 <0.00050 0.0158 <0.00050 <0.0005 0.00014J <0.0005 <0.0015 <0.00050 <0.00050 <0.0005 NA NA NA NA 8/20/2015 0.00032J <0.0005 <0.00050 0.00075 <0.00050 0.0046 <0.00050 <0.0005 <0.00050 <0.0005 <0.0015 <0.00050 <0.00050 <0.0005 NA NA NA NA 8/15/2016 0.00044J <0.0005 <0.00050 0.0083 <0.00050 0.0053 <0.00050 <0.0005 <0.00050 <0.0005 <0.0015 <0.00050 <0.00050 <0.0005 NA NA NA NA 8/20/2015 <0.00050 <0.0005 <0.00050 <0.00050 <0.00050 0.00082 <0.00050 <0.0005 <0.00050 <0.0005 <0.0015 <0.00050 <0.00050 <0.0005 NA NA NA NA 8/15/2016 <0.00013 <0.0005 <0.00013 <0.00013 <0.00013 0.00055 <0.00013 <0.0005 <0.00013 <0.0005 <0.00031 <0.00050 <0.00050 <0.0005 NA NA NA NA 1/23/2015 0.00042J <0.0005 <0.00050 0.0032 <0.00050 0.00025J <0.00050 <0.0005 <0.00050 <0.0005 <0.0015 <0.00050 <0.00050 <0.0005 NA NA NA NA 8/15/2016 <0.00013 <0.0005 <0.00013 0.0003J <0.00013 <0.00013 0.00016J <0.0005 <0.00013 <0.0005 <0.00031 <0.00050 <0.00050 <0.0005 NA NA NA NA MW-6 MW-5 MW-4 MW-2 Notes: Monitoring Wells Associated With Petroleum Release (Incident #39233) TW-1 MW-12 MW-10 MW-11 MW-9 MW-3 MW-8 MW-7 1. Bold concentrations exceed 15A NCAC 02L .0202 Groundwater Standards. 2.J - Estimated value below laboratory reporting limit. 3. NA - Not Analyzed. 4. NE - Not Established. 5. ND - Not Detected. Page 3 of 6 Table 8(1): Analytical Data for Groundwater (User Specified Chemicals) DSCA ID No.: DC920047 Ch l o r o f o r m Is o p r o p y l E t h e r (D i i s o p r o p y l E t h e r ) Is o p r o p y l b e n z e n e ( C u m e n e ) Me t h y l B u t y l K e t o n e (2 - H e x a n o n e ) Me t h y l E t h y l K e t o n e (2 - B u t a n o n e ) Me t h y l I s o b u t y l K e t o n e Me t h y l e n e C h l o r i d e m,p - X y l e n e s n- P r o p y l b e n z e n e o- X y l e n e St y r e n e 1, 2 - D i c h l o r o e t h a n e 1, 1 , 2 - Tr i c h l o r o t r i f l u o r o e t h a n e 0.07 0.07 0.07 0.04 4 0.1 0.005 0.5 0.07 0.5 0.07 0.0004 NE GW-1 01/06/14 NA NA NA NA NA NA NA <0.002 NA <0.001 NA NA NA GW-2 01/06/14 NA NA NA NA NA NA NA <0.002 NA <0.001 NA NA NA GW-3 01/06/14 NA NA NA NA NA NA NA <0.002 NA <0.001 NA NA NA GW-4 01/06/14 NA NA NA NA NA NA NA 0.001J NA 0.0008 NA NA NA GW-5 01/07/14 NA NA NA NA NA NA NA <0.002 NA <0.001 NA NA NA GW-6 01/07/14 NA NA NA NA NA NA NA <0.002 NA <0.001 NA NA NA GW-7 01/07/14 NA NA NA NA NA NA NA 4.3 NA 2.2 NA NA NA GW-8 01/07/14 NA NA NA NA NA NA NA 0.008J NA <0.001 NA NA NA GW-9 01/08/14 NA NA NA NA NA NA NA <0.002 NA <0.001 NA NA NA GW-10 01/08/14 NA NA NA NA NA NA NA <0.002 NA <0.001 NA NA NA GW-11 01/08/14 NA NA NA NA NA NA NA <0.002 NA <0.001 NA NA NA GW-13 01/08/14 NA NA NA NA NA NA NA <0.002 NA <0.001 NA NA NA GW-15 01/09/14 <0.00050 <0.0005 <0.0005 <0.005 <0.005 <0.005 <0.001 <0.001 <0.0005 <0.0005 <0.0005 <0.0005 NA TMW-1 07/13/12 NA <0.0005 <0.0005 NA NA NA 0.000180J <0.001 <0.0005 <0.0005 <0.0005 <0.0005 NA TMW-2 07/13/12 NA <0.002 0.00136J NA NA NA <0.02 0.018 0.00104J 0.00088J <0.002 <0.002 NA TMW-3 07/13/12 NA <0.8 <0.8 NA NA NA <8.0 4.35 <0.8 2.240 <0.8 <0.8 NA TMW-4 07/13/12 NA <0.0005 <0.0005 NA NA NA 0.000180J <0.001 <0.0005 <0.0005 <0.0005 <0.0005 NA TMW-5 07/13/12 NA <0.0005 <0.0005 NA NA NA 0.000220J <0.001 <0.0005 <0.0005 <0.0005 <0.0005 NA Gr o u n d w a t e r S a m p l i n g P o i n t Groundwater Grab Samples NC 2L Standard Sa m p l i n g D a t e ( m m / d d / y y ) Temporary Groundwater Monitoring Wells [mg/L] ADT 8 ADT 8(1) Page 4 of 6 Table 8(1): Analytical Data for Groundwater (User Specified Chemicals) DSCA ID No.: DC920047 Ch l o r o f o r m Is o p r o p y l E t h e r (D i i s o p r o p y l E t h e r ) Is o p r o p y l b e n z e n e ( C u m e n e ) Me t h y l B u t y l K e t o n e (2 - H e x a n o n e ) Me t h y l E t h y l K e t o n e (2 - B u t a n o n e ) Me t h y l I s o b u t y l K e t o n e Me t h y l e n e C h l o r i d e m,p - X y l e n e s n- P r o p y l b e n z e n e o- X y l e n e St y r e n e 1, 2 - D i c h l o r o e t h a n e 1, 1 , 2 - Tr i c h l o r o t r i f l u o r o e t h a n e 0.07 0.07 0.07 0.04 4 0.1 0.005 0.5 0.07 0.5 0.07 0.0004 NE Gr o u n d w a t e r S a m p l i n g P o i n t NC 2L Standard Sa m p l i n g D a t e ( m m / d d / y y ) [mg/L] ADT 8 ADT 8(1) 09/19/13 NA <0.5 0.126J NA NA NA <2 13.5 0.395J 6.41 <0.500 <0.500 NA 01/06/14 NA NA NA NA NA NA NA 0.87 NA 0.65 NA NA NA 02/03/14 NA 0.079 0.15 0.22J 0.26J 0.10J <0.10 13 0.32 6.9 0.087 <0.050 NA 01/23/15 <0.500 <0.5 0.13J NA NA NA <2 16 0.337J 8.38 <0.500 <0.500 NA 08/15/16 <0.500 <0.5 <0.5 NA NA NA <2 12.2 0.209J 6.08 <0.500 <0.500 NA 01/13/14 <0.00050 <0.0005 <0.0005 <0.005 <0.005 <0.005 <0.001 <0.0010 <0.0005 <0.0005 <0.0005 <0.0005 NA 10/20/17 <0.0020 <0.0005 <0.001 <0.01 <0.02 <0.01 <0.005 <0.002 <0.001 <0.001 <0.001 <0.001 NA 03/03/21 <0.000500 <0.000500 <0.000500 <0.00500 <0.00500 <0.00500 <0.00250 NA <0.000500 NA <0.000500 <0.000500 0.000970 02/15/24 <0.000500 <0.000500 <0.000500 <0.00500 <0.00500 <0.00500 <0.00250 NA <0.000500 NA <0.000500 <0.000500 0.000824 MW-3 01/13/14 <0.00050 <0.0005 <0.0005 <0.005 <0.005 <0.005 <0.001 <0.0010 <0.0005 <0.0005 <0.0005 <0.0005 NA MW-4 01/13/14 <0.00050 <0.0005 <0.0005 <0.005 <0.005 <0.005 <0.001 <0.0010 <0.0005 <0.0005 <0.0005 <0.0005 NA 01/13/14 <0.00050 <0.0005 <0.0005 <0.005 <0.005 <0.005 <0.001 <0.0010 <0.0005 <0.0005 <0.0005 <0.0005 NA 10/20/17 <0.0020 <0.0005 <0.001 <0.01 <0.02 <0.01 <0.005 <0.002 <0.001 <0.001 <0.001 0.00044J NA 03/03/21 <0.000500 <0.000500 <0.000500 <0.00500 <0.00500 <0.00500 <0.00250 NA <0.000500 NA <0.000500 0.000421J <0.000500 02/15/24 0.000500J <0.000500 <0.000500 <0.00500 <0.00500 <0.00500 <0.00250 NA <0.000500 NA <0.000500 0.000880 <0.000500 MW-6 01/13/14 <0.00050 <0.0005 <0.0005 <0.005 <0.005 <0.005 <0.001 <0.0010 <0.0005 <0.0005 <0.0005 <0.0005 NA 01/20/15 <0.00050 <0.0005 <0.0005 <0.005 <0.005 <0.005 <0.001 <0.0010 <0.0005 <0.0005 <0.0005 <0.0005 NA 10/20/17 <0.0020 <0.0005 <0.001 <0.01 <0.02 <0.01 <0.005 <0.002 <0.001 <0.001 <0.001 <0.001 NA 03/03/21 <0.000500 0.000138J <0.000500 <0.00500 <0.00500 <0.00500 <0.00250 NA <0.000500 NA <0.000500 <0.000500 0.000859 02/15/24 <0.000500 0.000210J <0.000500 <0.00500 <0.00500 <0.00500 <0.00250 NA <0.000500 NA <0.000500 <0.000500 0.000756 01/20/15 <0.00050 <0.0005 <0.0005 <0.005 <0.005 <0.005 <0.001 0.00068J 0.00064 0.00073 <0.0005 <0.0005 NA 10/20/17 <0.0020 <0.0005 <0.001 <0.01 <0.02 <0.01 <0.005 <0.002 <0.001 <0.001 <0.001 <0.001 NA 03/03/21 0.00185J <0.000500 <0.000500 <0.00500 <0.00500 <0.00500 <0.00250 NA <0.000500 NA <0.000500 <0.000500 <0.000500 02/15/24 <0.000500 <0.000500 <0.000500 <0.00500 <0.00500 <0.00500 <0.00250 NA <0.000500 NA <0.000500 <0.000500 <0.000500 MW-1 Permanent Groundwater Monitoring Wells MW-2 MW-5 MW-7 MW-8 Page 5 of 6 Table 8(1): Analytical Data for Groundwater (User Specified Chemicals) DSCA ID No.: DC920047 Ch l o r o f o r m Is o p r o p y l E t h e r (D i i s o p r o p y l E t h e r ) Is o p r o p y l b e n z e n e ( C u m e n e ) Me t h y l B u t y l K e t o n e (2 - H e x a n o n e ) Me t h y l E t h y l K e t o n e (2 - B u t a n o n e ) Me t h y l I s o b u t y l K e t o n e Me t h y l e n e C h l o r i d e m,p - X y l e n e s n- P r o p y l b e n z e n e o- X y l e n e St y r e n e 1, 2 - D i c h l o r o e t h a n e 1, 1 , 2 - Tr i c h l o r o t r i f l u o r o e t h a n e 0.07 0.07 0.07 0.04 4 0.1 0.005 0.5 0.07 0.5 0.07 0.0004 NE Gr o u n d w a t e r S a m p l i n g P o i n t NC 2L Standard Sa m p l i n g D a t e ( m m / d d / y y ) [mg/L] ADT 8 ADT 8(1) 01/23/15 <0.00050 <0.00050 <0.00050 NA NA NA <0.002 <0.001 <0.00050 <0.00050 <0.00050 <0.00050 NA 08/15/16 <0.00050 <0.0005 <0.00050 NA NA NA <0.002 <0.001 <0.00050 <0.00050 <0.00050 <0.00050 NA 01/23/15 <0.0025 <0.0025 0.0014J NA NA NA <0.010 0.0222 <0.0025 0.0061 <0.0025 <0.0025 NA 08/15/16 <0.0050 <0.005 0.0022J NA NA NA 0.0131J 0.0452 <0.0050 0.0137 <0.0050 <0.0050 NA 01/23/15 <0.0025 <0.0025 0.00063J NA NA NA <0.010 0.0141 <0.00078 0.0164 <0.0025 <0.0025 NA 08/15/16 <0.0050 0.0072 0.0182 NA NA NA 0.0122J 0.0715 0.0165 0.288 <0.0050 <0.0050 NA 01/23/15 <0.500 <0.5 0.142J NA NA NA <2 15.1 0.411J 7.39 <0.500 <0.500 NA 08/15/16 <0.250 0.0669J 0.112J NA NA NA <1 14.2 0.291 7.25 <0.250 <0.250 NA 01/23/15 <0.100 <0.1 0.0876J NA NA NA <0.4 0.0993J 0.0889J 0.0292J <0.100 <0.100 NA 08/15/16 39.2J <0.1 0.0831J NA NA NA <0.4 <0.2 0.0771J <0.1 <0.100 <0.100 NA 01/23/15 <0.100 <0.1 0.0856J NA NA NA <0.4 0.069J 0.0394J 0.0561J <0.100 <0.100 NA 08/15/16 <0.025 <0.025 0.0388 NA NA NA <0.1 <0.05 0.0132J 0.0092J <0.025 <0.025 NA 08/20/15 <0.00050 <0.05 0.0386J NA NA NA <0.2 0.164 0.0338J 0.0603 <0.050 <0.050 NA 08/15/16 <0.0050 0.0046J 0.0039J NA NA NA <0.02 0.0091J 0.0034J 0.0022J <0.0050 <0.0050 NA 08/20/15 <0.0050 <0.0005 0.00013J NA NA NA <0.02 0.00041 <0.00050 0.00021J <0.00050 <0.00050 NA 08/15/16 <0.00050 <0.0005 <0.00050 NA NA NA 0.00026J <0.001 <0.00050 <0.00050 <0.00050 <0.00050 NA 08/20/15 <0.00050 <0.0005 <0.00050 NA NA NA <0.002 <0.001 <0.00050 <0.00050 <0.00050 <0.00050 NA 08/15/16 <0.00050 <0.0005 <0.00050 NA NA NA <0.002 <0.001 <0.00050 <0.00050 <0.00050 <0.00050 NA 08/20/15 <0.00050 0.00016J <0.00050 NA NA NA <0.002 <0.001 <0.00050 <0.00050 <0.00050 <0.00050 NA 08/15/16 <0.00050 0.00032J <0.00050 NA NA NA <0.002 <0.001 <0.00050 <0.00050 <0.00050 <0.00050 NA 08/20/15 <0.00050 <0.0005 <0.00050 NA NA NA <0.002 <0.001 <0.00050 <0.00050 <0.00050 <0.00050 NA 08/15/16 <0.00050 <0.0005 <0.00050 NA NA NA <0.002 <0.001 <0.00050 <0.00050 <0.00050 <0.00050 NA 01/23/15 <0.00050 <0.0005 <0.00050 NA NA NA <0.002 <0.001 <0.00050 <0.00050 <0.00050 <0.00050 NA 08/15/16 <0.00050 <0.0005 <0.00050 NA NA NA <0.002 <0.001 <0.00050 <0.00050 <0.00050 <0.00050 NA MW-2 Notes: Monitoring Wells Associated With Petroleum Release (Incident #39233) TW-1 MW-9 MW-10 MW-11 MW-12 MW-3 MW-8 MW-4 MW-5 MW-6 MW-7 3. NA - Not Analyzed. 4. NE - Not Established. 5. ND - Not Detected. 1. Bold concentrations exceed 15A NCAC 02L .0202 Groundwater Standards. 2.J - Estimated value below laboratory reporting limit. Page 6 of 6 Be n z e n e ci s - 1 , 2 - D i c h l o r o e t h y l e n e Et h y l b e n z e n e Me t h y l t e r t - b u t y l e t h e r (M T B E ) Na p h t h a l e n e Te t r a c h l o r o e t h y l e n e To l u e n e tr a n s - 1 , 2 - D i c h l o r o e t h y l e n e Tr i c h l o r o e t h y l e n e Vi n y l c h l o r i d e Xy l e n e s ( t o t a l ) 0.00119a 0.060c 0.068b 0.019c 0.400c 0.0007a 0.011a 0.100b 0.0025a 0.000025a 6.2c SW-1 01/08/14 <0.001 <0.001 <0.001 NA NA <0.001 <0.001 <0.001 <0.001 <0.001 <0.003 SW-2 01/08/14 <0.001 <0.001 <0.001 NA NA <0.001 <0.001 <0.001 <0.001 <0.001 <0.003 Notes: 1) a = Value based on North Carolina 15A NCAC 02B Water Quality Standards for Surface Waters. 2) b = Value based on EPA National Recommended Water Quality Criteria for Aquatic Life & Human Health. 3) c = Value based on North Carolina In-Stream Target Values for Surface Waters. 4) < = Not detected or less than laboratory reporting limit. 5) mg/L = milligrams per liter. 6) NA = Not analyzed. NC SWQS = NC Surface Water Quality Standards (updated on 7/26/2021). Sa m p l e I D Sa m p l i n g D a t e ( m m / d d / y y ) [mg/L] NC SWQS Surface water samples were from an unnamed tributary of Walnut Creek (Classification C; NSW). Table 9: Analytical Data for Surface Water DSCA ID No.: DC920047 ADT 9 Page 1 of 1 Table 12: Analytical Data for Natural Attenuation Parameters DSCA ID No.: DC920047 Sa m p l i n g D a t e ( m m / d d / y y ) Di s s o l v e d o x y g e n ( D O ) Ni t r a t e Su l f a t e Ma j o r C a t i o n s Me t h a n e Fe r r o u s I r o n Ox i d a t i o n r e d u c t i o n po t e n t i a l ( O R P ) Al k a l i n i t y Ch l o r i d e ( o p t i o n a l ) Co n d u c t i v i t y pH Te m p e r a t u r e To t a l o r g a n i c c a r b o n (T O C ) Et h a n e Et h e n e Units mg/L mg/L mg/L mg/L mg/L mg/L mV mg/L mg/L μs/cm2 std unit ° C mg/L mg/L mg/L 10/20/17 3.27 NA NA NA NA NA 92.7 NA NA 74 4.88 20.46 NA NA NA 03/03/21 3.79 NA NA NA NA NA -80.5 NA NA 85 5.76 18.86 NA NA NA 02/15/24 3.52 NA NA NA NA NA 175.9 NA NA 82.3 5.97 15.5 NA NA NA 10/20/17 2.62 NA NA NA NA NA 97.6 NA NA 158 5.57 23.42 NA NA NA 03/03/21 1.79 NA NA NA NA NA -78.2 NA NA 121 5.45 19.78 NA NA NA 02/15/24 1.19 NA NA NA NA NA 179.4 NA NA 121.8 5.70 16.2 NA NA NA 10/20/17 1.94 NA NA NA NA NA 113.4 NA NA 126 5.85 21.41 NA NA NA 03/03/21 1.71 NA NA NA NA NA -107.8 NA NA 111 6.00 18.94 NA NA NA 02/15/24 1.64 NA NA NA NA NA 156.2 NA NA 131.1 6.36 18.30 NA NA NA 10/20/17 4.38 NA NA NA NA NA 63.6 NA NA 135 5.97 21.53 NA NA NA 03/03/21 3.62 NA NA NA NA NA -69.9 NA NA 113 5.77 19.10 NA NA NA 02/15/24 2.99 NA NA NA NA NA 166.6 NA NA 111.9 6.02 17.9 NA NA NA MW-8 Sa m p l e I D MW-2 MW-5 MW-7 ADT 12 Page 1 of 1 PROCTOR ROAD CANOPY RO C K Q U A R R Y R O A D LEGEND: SB-1 SITE PROPERTY LINE NOTE: ALL LOCATIONS ARE APPROXIMATE PARCEL LINE SOIL BORING Boring Identification 10 SCALE: 1" = 30' 0 20 30 N PROCTOR ROAD APPROXIMATE LOCATION OF FORMER SOUTHGATE CLEANERS SB-9 SB-11 SB-10 SB-4 SB-1 SB-2 SB-8 SB-3 SB-5 SB-7 SB-6 P P P PT P P OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U PT OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OHU OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OH U OHU OHU OHU OHU OHU OHU OHU OHU OH U OH U OH U CB EXISTINGVALEROGAS STATION OHU OVERHEAD UTILITY UTILITY POLE W/ TRANSFORMER UTILITY POLE PT P CATCH BASINCB 0.0063 TETRACHLOROETHYLENE ISOCONCENTRATION CONTOUR (DASHED WHERE INFERRED) (mg/kg) SOUTH RIDGE APARTMENTS 0.0063 Attachment: Dra w i n g F i l e : Pr o j e c t N u m b e r : Ck d . B y : Dr n . B y : Ap p ' d B y : Ck d . D a t e : Scale: Date: C: \ U S E R S \ M I L E S . S H A R P L E S S \ O N E A T L A S \ D I G I T A L S E R V I C E S - F I L E S E R V E R \ 2 0 2 4 \ C A D D E P A R T M E N T \ N C D E Q - D W M - D S C A P R O G R A M \ 9 2 - 0 0 4 7 S O U T H G A T E C L E A N E R S \ D C 9 2 4 7 S L 1 1 - S O I L . D W G , AT T 1 . 2 . 3 SO I L A N A L Y T I C A L M A P 06/19/2024 SE E L O W E R L E F T SO U T H G A T E C L E A N E R S 19 6 5 R O C K Q U A R R Y R O A D RA L E I G H , N O R T H C A R O L I N A 2 7 6 1 2 DC 9 2 4 7 S L 1 1 AS SHOWN MS JR 1/2/3 NO T E S : 1. Fe a t u r e s s h o w n a r e n o t a n a u t h o r i t a t i v e l o c a t i o n , n o r a r e t h e y p r e s e n t e d t o a s t a t e d ac c u r a c y . 2. BO L D = E x c e e d s t h e l o w e r o f t h e I n a c t i v e H a z a r d o u s S i t e s B r a n c h R e s i d e n t i a l a n d Pr o t e c t i o n o f G r o u n d w a t e r P r e l i m i n a r y S o i l R e m e d i a t i o n G o a l s ( F e b r u a r y 2 0 2 4 ) . 3. < = N o t d e t e c t e d a b o v e l a b o r a t o r y r e p o r t i n g l i m i t . 4. So i l r e s u l t s a r e m e a s u r e d i n m i l l i g r a m s p e r k i l o g r a m ( m g / k g ) . 5. ft b g s = f e e t b e l o w g r o u n d s u r f a c e . 6. J = E s t i m a t e d v a l u e a b o v e l a b o r a t o r y m e t h o d d e t e c t i o n l i m i t , b u t b e l o w l a b o r a t o r y re p o r t i n g l i m i t . CO O R D I N A T E S Y S T E M : NA D 1 9 8 3 N O R T H C A R O L I N A S T A T E P L A N E F I P S 3 2 0 0 , U S S U R V E Y F E E T DS C A S I T E I D : DC 9 2 0 0 4 7 ME R R I C K S T R E E T PROCTOR ROAD RO C K Q U A R R Y R O A D LIB E R T Y P L A C E MAL O N E P L A C E LEGEND: TYPE II MONITORING WELL Well Identification MW-1 SOURCE PROPERTY LINE WAKE COUNTY PARCELS APPROXIMATE LOCATION OF FORMER SOUTHGATE CLEANERS TYPE II MONITORING WELL ASSOCIATED WITHMW-1 Well Identification TYPE III MONITORING WELL ASSOCIATED WITHTW-1 PETROLEUM INCIDENT 39233 Well Identification PETROLEUM INCIDENT 39233 MW-3 MW-2 MW-6 MW-4 MW-5 MW-1 MW-7 MW-8 MW-4 TW-1 MW-11 MW-10 MW-8MW-5 MW-6 MW-9MW-7 MW-12 MW-3 MW-2 BURGER KING HAN-DEE HUGO'S FAMILY DOLLAR SOUTH RIDGE APARTMENTS SOUTH RIDGE APARTMENTS 23 0 240 240 250 25 0 260 26 0 270 270 270 270 28 0 280 22 6 22 8 232 234 234 23 6 236 23 8 23 8 24 2 24 2 24 4 24 4 246 24 6 24 8 24 8 25 2 25 2 25 4 25 4 25 6 25 6 25 8 258 262 26 2 264 26 4 266 26 6 268 268 27 2 272 272 272 274 274 27 6 27 6 27 8 278 27 8 278 28 2 284 28 4 N SCALE: 1" = 80' 0 20 40 60 80 260 WAKE COUNTY TOPOGRAPHY NOTE: ALL LOCATIONS ARE APPROXIMATE Attachment: Dr a w i n g F i l e : Pro j e c t N u m b e r : Ck d . B y : Drn . B y : Ap p ' d B y : Ck d . D a t e : Scale: Date: C: \ U S E R S \ E C H O . M I L A N U K \ O N E A T L A S \ D I G I T A L S E R V I C E S - F I L E S E R V E R \ 2 0 2 4 \ C A D D E P A R T M E N T \ N C D E Q - D W M - D S C A P R O G R A M \ 9 2 - 0 0 4 7 S O U T H G A T E C L E A N E R S \ D C 9 2 4 7 S L 1 4 - M W . D W G , AT T 4 MO N I T O R I N G W E L L L O C A T I O N M A P 03/29/2024 SE E L O W E R L E F T SO U T H G A T E C L E A N E R S 19 6 5 R O C K Q U A R R Y R O A D RA L E I G H , N O R T H C A R O L I N A DC 9 2 4 7 S L 1 4 AS SHOWN EM JR 4 NO T E S : 1. Fe a t u r e s s h o w n a r e n o t a n a u t h o r i t a t i v e l o c a t i o n , n o r a r e t h e y p r e s e n t e d to a s t a t e d a c c u r a c y . CO O R D I N A T E S Y S T E M : NA D 1 9 8 3 N O R T H C A R O L I N A S T A T E P L A N E F I P S 3 2 0 0 , U S S U R V E Y F E E T DS C A S I T E I D : DC 9 2 0 0 4 7 ME R R I C K S T R E E T PROCTOR ROAD RO C K Q U A R R Y R O A D LIB E R T Y P L A C E MAL O N E P L A C E N SCALE: 1" = 80' 0 20 40 60 80 LEGEND: SOURCE PROPERTY LINE WAKE COUNTY PARCELS APPROXIMATE LOCATION OF FORMER SOUTHGATE CLEANERS TYPE II MONITORING WELL ASSOCIATED WITHMW-1 Well Identification TYPE III MONITORING WELL ASSOCIATED WITHTW-1 PETROLEUM INCIDENT 39233 Well Identification PETROLEUM INCIDENT 39233 MW-3 MW-2 MW-6 MW-4 MW-5 MW-1 MW-7 MW-8 MW-4 TW-1 MW-11 MW-10 MW-8MW-5 MW-6 MW-9MW-7 MW-12 MW-3 MW-2 738 GROUNDWATER ELEVATION CONTOUR (DASHED WHERE INFERRED) (ft) GROUNDWATER FLOW DIRECTION 72.76 MONITORING WELL Well Identification Relative Groundwater Elevation (ft) MW-5 70.47 73.36 74.13 72.76 64.82 45.30 68.78 65.22 FAMILY DOLLAR SOUTH RIDGE APARTMENTS HAN-DEE HUGO'S BURGER KING SOUTH RIDGE APARTMENTS 46 4850 52 54 56 5860 6264 66 687072 74 Attachment: Dr a w i n g F i l e : Pro j e c t N u m b e r : Ck d . B y : Drn . B y : Ap p ' d B y : Ck d . D a t e : Scale: Date: C: \ U S E R S \ E C H O . M I L A N U K \ O N E A T L A S \ D I G I T A L S E R V I C E S - F I L E S E R V E R \ 2 0 2 4 \ C A D D E P A R T M E N T \ N C D E Q - D W M - D S C A P R O G R A M \ 9 2 - 0 0 4 7 S O U T H G A T E C L E A N E R S \ D C 9 2 4 7 S L 1 4 - G W . D W G , AT T 6 GR O U N D W A T E R E L E V A T I O N C O N T O U R M A P 03/29/2024 SE E L O W E R L E F T SO U T H G A T E C L E A N E R S 19 6 5 R O C K Q U A R R Y R O A D RA L E I G H , N O R T H C A R O L I N A DC 9 2 4 7 S L 1 4 AS SHOWN EM JR 6 NO T E S : 1. Fe a t u r e s s h o w n a r e n o t a n a u t h o r i t a t i v e l o c a t i o n , n o r a r e t h e y p r e s e n t e d to a s t a t e d a c c u r a c y . 2. MW - 1 i s a s s o c i a t e d w i t h b o t h S o u t h g a t e C l e a n e r s s i t e a n d P e t r o l e u m in c i d e n t # 3 9 2 3 3 . 3. Gr o u n d w a t e r e l e v a t i o n s w e r e m e a s u r e d 0 2 / 1 5 / 2 0 2 4 . CO O R D I N A T E S Y S T E M : NA D 1 9 8 3 N O R T H C A R O L I N A S T A T E P L A N E F I P S 3 2 0 0 , U S S U R V E Y F E E T DS C A S I T E I D : DC 9 2 0 0 4 7 MW-3 MW-2 MW-6 MW-4 MW-5 MW-1 ME R R I C K S T R E E T PROCTOR ROAD RO C K Q U A R R Y R O A D LIB E R T Y P L A C E MAL O N E P L A C E MW-7 MW-8 MW-4 TW-1 MW-11 MW-10 MW-8MW-5 MW-6 MW-9MW-7 MW-12 MW-3 MW-2 N SCALE: 1" = 80' 0 20 40 60 80 LEGEND: TYPE II MONITORING WELL Well Identification MW-1 SOURCE PROPERTY LINE WAKE COUNTY PARCELS APPROXIMATE LOCATION OF FORMER SOUTHGATE CLEANERS TYPE II MONITORING WELL ASSOCIATED WITHMW-1 Well Identification TYPE III MONITORING WELL ASSOCIATED WITHTW-1 PETROLEUM INCIDENT 39233 Well Identification PETROLEUM INCIDENT 39233 738 PCE ISOCONCENTRATION CONTOUR (DASHED WHERE INFERRED) BURGER KING HAN-DEE HUGO'S FAMILY DOLLAR SOUTH RIDGE APARTMENTS SOUTH RIDGE APARTMENTS 0.007 0.0007 Attachment: Dr a w i n g F i l e : Pro j e c t N u m b e r : Ck d . B y : Drn . B y : Ap p ' d B y : Ck d . D a t e : Scale: Date: C: \ U S E R S \ E C H O . M I L A N U K \ O N E A T L A S \ D I G I T A L S E R V I C E S - F I L E S E R V E R \ 2 0 2 4 \ C A D D E P A R T M E N T \ N C D E Q - D W M - D S C A P R O G R A M \ 9 2 - 0 0 4 7 S O U T H G A T E C L E A N E R S \ D C 9 2 4 7 S L 1 4 - P C E . D W G , AT T 7 GR O U N D W A T E R A N A L Y T I C A L M A P 03/29/2024 SE E L O W E R L E F T SO U T H G A T E C L E A N E R S 19 6 5 R O C K Q U A R R Y R O A D RA L E I G H , N O R T H C A R O L I N A DC 9 2 4 7 S L 1 4 AS SHOWN EM JR 7 NO T E S : 1. Fe a t u r e s s h o w n a r e n o t a n a u t h o r i t a t i v e l o c a t i o n , n o r a r e t h e y p r e s e n t e d t o a s t a t e ac c u r a c y . 2. MW - 1 i s a s s o c i a t e d w i t h t h e S o u t h g a t e C l e a n e r s s i t e a n d P e t r o l e u m I n c i d e n t # 3 9 2 3 3 . 3. Va l u e s s h o w n BO L D in d i c a t e a n e x c e e d a n c e a b o v e t h e 2 L S t a n d a r d . 4. < = N o t d e t e c t e d a b o v e l a b o r a t o r y r e p o r t i n g d e t e c t i o n l i m i t . 5. Gr o u n d w a t e r r e s u l t s a r e m e a s u r e d i n m i l l i g r a m s p e r l i t e r ( m g / L ) . 6. Te t r a c h l o r o e t h y l e n e a n d a n y o t h e r c o m p o u n d d e t e c t e d a b o v e t h e 2 L S t a n d a r d i s sh o w n o n f i g u r e . CO O R D I N A T E S Y S T E M : NA D 1 9 8 3 N O R T H C A R O L I N A S T A T E P L A N E F I P S 3 2 0 0 , U S S U R V E Y F E E T DS C A S I T E I D : DC 9 2 0 0 4 7 ATTACHMENT 8 GROUNDWATER CONCENTRATION TREND PLOTS Evaluation Date:Job ID: Facility Name:Constituent: Conducted By:Concentration Units:mg/L Sampling Point ID:PCE TCE Sampling Sampling Event Date 1 13-Jan-14 0.0032 0.013 2 20-Oct-17 0.0014 0.0005 3 3-Mar-21 0.000654 0.00025 4 15-Feb-24 0.00103 0.00025 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Coefficient of Variation:0.72 1.81Mann-Kendall Statistic (S):-4 -5 Confidence Factor:83.3%89.6% Concentration Trend:Stable No Trend Notes: 1.At least four independent sampling events per well are required for calculating the trend. Methodology is valid for 4 to 40 samples. 2.Confidence in Trend = Confidence (in percent) that constituent concentration is increasing (S>0) or decreasing (S<0): >95% = Increasing or Decreasing; ≥ 90% = Probably Increasing or Probably Decreasing; < 90% and S>0 = No Trend; < 90%, S≤0, and COV ≥ 1 = No Trend; < 90% and COV < 1 = Stable. 3.Methodology based on "MAROS: A Decision Support System for Optimizing Monitoring Plans", J.J. Aziz, M. Ling, H.S. Rifai, C.J. Newell, and J.R. Gonzales, Ground Water, 41(3):355-367, 2003. DISCLAIMER: The GSI Mann-Kendall Toolkit is available "as is". Considerable care has been exercised in preparing this software product; however, no party, including without limitation GSI Environmental Inc., makes any representation or warranty regarding the accuracy, correctness, or completeness of the information contained herein, and no such party shall be liable for any direct, indirect, consequential, incidental or other damages resulting from the use of this product or the information contained herein. Information in this publication is subject to change without notice. GSI Environmental Inc., disclaims any responsibility or obligation to update the information contained herein. GSI Environmental Inc., www.gsi-net.com MW-2 CONCENTRATION (mg/L) 12-Apr-24 Southgate Cleaners MW-2 GSI MANN-KENDALL TOOLKIT for Constituent Trend Analysis ATC Associates of North Carolina, P.C. DSCA Site ID DC920047 0.0001 0.001 0.01 0.1 1 04/12 08/13 12/14 05/16 09/17 02/19 06/20 10/21 03/23 07/24 12/25 Co n c e n t r a t i o n ( m g / L ) Sampling Date PCE TCE Evaluation Date:Job ID: Facility Name:Constituent: Conducted By:Concentration Units:mg/L Sampling Point ID:PCE TCE Sampling Sampling Event Date 1 13-Jan-14 0.021 0.0082 2 20-Oct-17 0.002 0.00067 3 3-Mar-21 0.00102 0.000203 4 15-Feb-24 0.000449 0.00025 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Coefficient of Variation:1.63 1.68Mann-Kendall Statistic (S):-6 -4 Confidence Factor:95.8%83.3% Concentration Trend:Decreasing No Trend Notes: 1.At least four independent sampling events per well are required for calculating the trend. Methodology is valid for 4 to 40 samples. 2.Confidence in Trend = Confidence (in percent) that constituent concentration is increasing (S>0) or decreasing (S<0): >95% = Increasing or Decreasing; ≥ 90% = Probably Increasing or Probably Decreasing; < 90% and S>0 = No Trend; < 90%, S≤0, and COV ≥ 1 = No Trend; < 90% and COV < 1 = Stable. 3.Methodology based on "MAROS: A Decision Support System for Optimizing Monitoring Plans", J.J. Aziz, M. Ling, H.S. Rifai, C.J. Newell, and J.R. Gonzales, Ground Water, 41(3):355-367, 2003. DISCLAIMER: The GSI Mann-Kendall Toolkit is available "as is". Considerable care has been exercised in preparing this software product; however, no party, including without limitation GSI Environmental Inc., makes any representation or warranty regarding the accuracy, correctness, or completeness of the information contained herein, and no such party shall be liable for any direct, indirect, consequential, incidental or other damages resulting from the use of this product or the information contained herein. Information in this publication is subject to change without notice. GSI Environmental Inc., disclaims any responsibility or obligation to update the information contained herein. MW-5 CONCENTRATION (mg/L) GSI Environmental Inc., www.gsi-net.com GSI MANN-KENDALL TOOLKIT for Constituent Trend Analysis 12-Apr-24 DSCA Site ID DC920047 Southgate Cleaners MW-5 ATC Associates of North Carolina, P.C. 0.0001 0.001 0.01 0.1 1 04/12 08/13 12/14 05/16 09/17 02/19 06/20 10/21 03/23 07/24 12/25 Co n c e n t r a t i o n ( m g / L ) Sampling Date PCE TCE Evaluation Date:Job ID: Facility Name:Constituent: Conducted By:Concentration Units:mg/L Sampling Point ID:PCE Sampling SamplingEventDate 1 20-Jan-15 0.11 2 20-Oct-17 0.045 3 3-Mar-21 0.0708 4 15-Feb-24 0.0311 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Coefficient of Variation:0.54Mann-Kendall Statistic (S):-4 Confidence Factor:83.3% Concentration Trend:Stable Notes: 1.At least four independent sampling events per well are required for calculating the trend. Methodology is valid for 4 to 40 samples. 2.Confidence in Trend = Confidence (in percent) that constituent concentration is increasing (S>0) or decreasing (S<0): >95% = Increasing or Decreasing; ≥ 90% = Probably Increasing or Probably Decreasing; < 90% and S>0 = No Trend; < 90%, S≤0, and COV ≥ 1 = No Trend; < 90% and COV < 1 = Stable. 3.Methodology based on "MAROS: A Decision Support System for Optimizing Monitoring Plans", J.J. Aziz, M. Ling, H.S. Rifai, C.J. Newell, and J.R. Gonzales, Ground Water, 41(3):355-367, 2003. DISCLAIMER: The GSI Mann-Kendall Toolkit is available "as is". Considerable care has been exercised in preparing this software product; however, no party, including without limitation GSI Environmental Inc., makes any representation or warranty regarding the accuracy, correctness, or completeness of the information contained herein, and no such party shall be liable for any direct, indirect, consequential, incidental or other damages resulting from the use of this product or the information contained herein. Information in this publication is subject to change without notice. GSI Environmental Inc., disclaims any responsibility or obligation to update the information contained herein. MW-7 CONCENTRATION (mg/L) GSI Environmental Inc., www.gsi-net.com GSI MANN-KENDALL TOOLKIT for Constituent Trend Analysis 12-Apr-24 DSCA Site ID DC920047 Southgate Cleaners MW-7 ATC Associates of North Carolina, P.C. 0.01 0.1 1 08/13 12/14 05/16 09/17 02/19 06/20 10/21 03/23 07/24 12/25 Co n c e n t r a t i o n ( m g / L ) Sampling Date PCE PCE Evaluation Date:Job ID: Facility Name:Constituent: Conducted By:Concentration Units:mg/L Sampling Point ID:PCE Sampling Sampling Event Date 1 13-Jan-14 0.0075 2 20-Oct-17 0.0032 3 3-Mar-21 0.00238 4 15-Feb-24 0.00238 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Coefficient of Variation:0.63Mann-Kendall Statistic (S):-5 Confidence Factor:89.6% Concentration Trend:Stable Notes: 1.At least four independent sampling events per well are required for calculating the trend. Methodology is valid for 4 to 40 samples. 2.Confidence in Trend = Confidence (in percent) that constituent concentration is increasing (S>0) or decreasing (S<0): >95% = Increasing or Decreasing; ≥ 90% = Probably Increasing or Probably Decreasing; < 90% and S>0 = No Trend; < 90%, S≤0, and COV ≥ 1 = No Trend; < 90% and COV < 1 = Stable. 3.Methodology based on "MAROS: A Decision Support System for Optimizing Monitoring Plans", J.J. Aziz, M. Ling, H.S. Rifai, C.J. Newell, and J.R. Gonzales, Ground Water, 41(3):355-367, 2003. DISCLAIMER: The GSI Mann-Kendall Toolkit is available "as is". Considerable care has been exercised in preparing this software product; however, no party, including without limitation GSI Environmental Inc., makes any representation or warranty regarding the accuracy, correctness, or completeness of the information contained herein, and no such party shall be liable for any direct, indirect, consequential, incidental or other damages resulting from the use of this product or the information contained herein. Information in this publication is subject to change without notice. GSI Environmental Inc., disclaims any responsibility or obligation to update the information contained herein. MW-8 CONCENTRATION (mg/L) GSI Environmental Inc., www.gsi-net.com GSI MANN-KENDALL TOOLKIT for Constituent Trend Analysis 12-Apr-24 DSCA Site ID DC920047 Southgate Cleaners MW-8 ATC Associates of North Carolina, P.C. 0.001 0.01 0.1 1 04/12 08/13 12/14 05/16 09/17 02/19 06/20 10/21 03/23 07/24 12/25 Co n c e n t r a t i o n ( m g / L ) Sampling Date PCE PCE SOUTH RIDGE APARTMENTS AERIAL .08 APPROXIMATE LOCATIONOF GLAM-O-RAMA(DC920049) ADFAD ME R R I C K S T R E E T RO C K Q U A R R Y R O A D LEGEND: SITE PROPERTY LINE NOTE: ALL LOCATIONS ARE APPROXIMATE PARCEL LINE PROCTOR ROAD APPROXIMATE LOCATION OF FORMER DRY CLEANER SURFACE WATER MAL O N E P L A C E LIB E R T Y P L A C E FO U N T A I N D R I V E SO U T H G A T E D R I V E CR A W F O R D R O A D S SOUTH RIDGE APARTMENTS RISING STAR JrVERSITY CDC SOUTH RIDGE APARTMENTS SOUTH RIDGE APARTMENTS SOUTH RIDGE APARTMENTS SOUTH RIDGE APARTMENTS SOUTHGATE SMOKE AND VAPE FAMILY DOLLAR MACEDONIANEW LIFE CHURCH EXXON KIND SMILES BURGER KING M&F BANK SW-1 SURFACE WATER SAMPLE Sample Identification 50 SCALE: 1" = 200' 0 100 150 200 N SW-1 SW-2 Attachment: Dra w i n g F i l e : Pr o j e c t N u m b e r : Ck d . B y : Dr n . B y : Ap p ' d B y : Ck d . D a t e : Scale: Date: C: \ U S E R S \ J A C K . G O S E \ O N E A T L A S \ D I G I T A L S E R V I C E S - F I L E S E R V E R \ 2 0 2 4 \ C A D D E P A R T M E N T \ N C D E Q - D W M - D S C A P R O G R A M \ 9 2 - 0 0 4 7 S O U T H G A T E C L E A N E R S \ D C 9 2 4 7 S L 1 4 - S W . D W G , 9. 1 0 SU R F A C E W A T E R A N A L Y T I C A L M A P 04/18/2024 SE E L O W E R L E F T SO U T H G A T E C L E A N E R S 19 6 5 R O C K Q U A R R Y R O A D RA L E I G H , N O R T H C A R O L I N A 2 7 6 1 2 DC 9 2 4 7 S L 1 4 AS SHOWN JG JR 9/10 NO T E S : 1. Fe a t u r e s s h o w n a r e n o t a n a u t h o r i t a t i v e l o c a t i o n , n o r a r e t h e y p r e s e n t e d t o a s t a t e d 2. < = N o t d e t e c t e d a b o v e l a b o r a t o r y r e p o r t i n g l i m i t . 3. Su r f a c e w a t e r r e s u l t s a r e m e a s u r e d i n m i l l i g r a m s p e r l i t e r ( m g / L ) . CO O R D I N A T E S Y S T E M : NA D 1 9 8 3 N O R T H C A R O L I N A S T A T E P L A N E F I P S 3 2 0 0 , U S S U R V E Y F E E T DS C A S I T E I D : DC 9 2 0 0 4 7 APPROXIMATE LOCATION OF GLAM-O-RAMA (DC920049) RO C K Q U A R R Y R O A D MAL O N E P L A C E INDOOR AIR SAMPLE NO IA-2 Sample Identification LEGEND: AMBIENT AIR SAMPLE NO AA-2 Sample Identification SUBJECT PARCEL WAKE COUNTY PARCELS APPROXIMATE LOCATION OF FORMER SOUTHGATE CLEANERS AA-1 AA-2 AA-3 AA-4 ME R R I C K S T R E E T PROC T O R R O A D LIB E R T Y P L A C E APPROXIMATE LOCATION OF FORMER SOUTHGATE CLEANERS PCE = TETRACHLOROETHYLENE TCE = TRICHLOROETHYLENE CR = CUMULATIVE CARCINOGENIC RISK HI = RESIDENTIAL HAZARD INDEX CR = HI VALUES IN EXCEED DSCA PROGRAM'S ACCEPTABLE LIMITS. ALL CONCENTRATIONS IN ug/m³ SCALE: 1" = 100' 0 25 1005075 N RISK EXCEEDANCE RISK EXCEEDANCE Attachment: Dr a w i n g F i l e : Pro j e c t N u m b e r : Ck d . B y : Drn . B y : Ap p ' d B y : Ck d . D a t e : Scale: Date: C: \ U S E R S \ M I L E S . S H A R P L E S S \ O N E A T L A S \ D I G I T A L S E R V I C E S - F I L E S E R V E R \ 2 0 2 4 \ C A D D E P A R T M E N T \ N C D E Q - D W M - D S C A P R O G R A M \ 9 2 - 0 0 4 7 S O U T H G A T E C L E A N E R S \ D C 9 2 4 7 S L 1 1 - A I R . D W G , AT T 1 3 . 1 4 A IN D O O R A I R A N A L Y T I C A L M A P 06/19/2024 SE E L O W E R L E F T SO U T H G A T E C L E A N E R S 19 6 5 R O C K Q U A R R Y R O A D RA L E I G H , N O R T H C A R O L I N A 2 7 6 1 2 DC 9 2 4 7 S L 1 1 AS SHOWN MS JR 13/14A NO T E S : 1. Fe a t u r e s s h o w n a r e n o t a n a u t h o r i t a t i v e l o c a t i o n , n o r a r e t h e y p r e s e n t e d to a s t a t e d a c c u r a c y . 2. J = E s t i m a t e d v a l u e b e l o w l a b o r a t o r y c a l i b r a t i o n r a n g e 3. M = M a n u a l i n t e g r a t i o n p e r f o r m e d o n p e a k d u e t o i m p r o p e r i n t e g r a t i o n by c h r o m a t o g r a p h y d a t a s y s t e m 4. Ca r c i n o g e n i c r i s k a n d / o r n o n - c a r c i n o g e n i c h a z a r d i n d e x v a l u e s i n BO L D ex c e e d t h e D S C A P r o g r a m s R e s i d e n t i a l a c c e p t a b l e l i m i t s . 5. P = P a s s i v e s a m p l e . CO O R D I N A T E S Y S T E M : NA D 1 9 8 3 N O R T H C A R O L I N A S T A T E P L A N E F I P S 3 2 0 0 , U S S U R V E Y F E E T DS C A S I T E I D : DC 9 2 0 0 4 7 RO C K Q U A R R Y R O A D PROCTOR ROAD SGMP-8 SGMP-7 SGMP-6 SGMP-5 SGMP-4 SGMP-2 SGMP-3 SGMP-1 NS-4NS-1 NS-2 NS-3 NS-5 NS-6 NS-14 NS-8 NS-9 NS-10 NS-7 NS-11 NS-12 NS-13S/ NS-13D LIB E R T Y P L A C E MAL O N E P L A C E LEGEND: SOURCE PROPERTY LINE NOTE: ALL LOCATIONS ARE APPROXIMATE * = SAMPLE COLLECTED FROM PROPERTY CLASSIFIED AS NON-RESIDENTIAL LAND USE. OTHER SAMPLES WERE COLLECTED FROM A PROPERTY CLASSIFIED AS RESIDENTIAL WAKE COUNTY PARCELS NO RISK EXCEEDANCESNS-1 Sample Identification NO RISK EXCEEDANCESSGMP-1 Sample Identification APPROXIMATE LOCATION OF FORMER SOUTHGATE CLEANERS RES CR = RESIDENTIAL CARCINOGENIC RISK RES HI = RESIDENTIAL HAZARD INDEX NON-RES CR = NON-RESIDENTIAL CARCINOGENIC RISK NON-RES HI = NON-RESIDENTIAL HAZARD INDEX SOIL GAS MONITORING POINT NEAR-SLAB SAMPLE RESIDENTIAL RISK EXCEEDANCESNS-3 Sample Identification NEAR-SLAB SAMPLE RESIDENTIAL RISK EXCEEDANCESSGMP-7 Sample Identification SOIL GAS MONITORING POINT NON-RESIDENTIAL RISK EXCEEDANCESNS-2 Sample Identification NEAR-SLAB SAMPLE NON-RESIDENTIAL RISK EXCEEDANCESSGMP-5 Sample Identification SOIL GAS MONITORING POINT SS-3 SS-1 SS-2 NO RISK EXCEEDANCESSS-1 Sample Identification SUB-SLAB GAS SAMPLE SCALE: 1" = 60' 200 40 60 N Figure: Dra w i n g F i l e : Pr o j e c t N u m b e r : Ck d . B y : Dr n . B y : Ap p ' d B y : Ck d . D a t e : Scale: Date: C: \ U S E R S \ M I L E S . S H A R P L E S S \ O N E A T L A S \ D I G I T A L S E R V I C E S - F I L E S E R V E R \ 2 0 2 4 \ C A D D E P A R T M E N T \ N C D E Q - D W M - D S C A P R O G R A M \ 9 2 - 0 0 4 7 S O U T H G A T E C L E A N E R S \ D C 9 2 4 7 S L 1 1 - V A P O R . D W G , FI G 1 3 . 1 4 B SO I L G A S A N A L Y T I C A L M A P 6/24 SE E L O W E R L E F T SO U T H G A T E C L E A N E R S 19 6 5 R O C K Q U A R R Y R O A D RA L E I G H , W A K E C O U N T Y , N O R T H C A R O L I N A 2 7 6 1 2 DC 9 2 4 7 S L 1 1 AS SHOWN MS JR 13/14B NO T E S : 1. Fe a t u r e s s h o w n a r e n o t a n a u t h o r i t a t i v e l o c a t i o n , n o r a r e t h e y p r e s e n t e d t o a s t a t e d ac c u r a c y . 2. * = S a m p l e c o l l e c t e d f r o m p r o p e r t y c l a s s i f i e d a s n o n - r e s i d e n t i a l l a n d u s e . O t h e r sa m p l e s w e r e c o l l e c t e d f r o m a p r o p e r t y c l a s s i f i e d a s r e s i d e n t i a l . 3. Ca r c i n o g e n i c R i s k a n d / o r N o n - C a r c i n o g e n i c H a z a r d I n d e x v a l u e s i n BO L D /BO L D ex c e e d t h e D S C A p r o g r a m ' s a c c e p t a b l e l i m i t s . 4. PC E = T e t r a c h l o r o e t h y l e n e . 5. TC E = T r i c h l o r o e t h y l e n e 6. J = E s t i m a t e d V a l u e 7. -- = R i s k n o t q u a n t i f i a b l e CO O R D I N A T E S Y S T E M : NA D 1 9 8 3 N O R T H C A R O L I N A S T A T E P L A N E F I P S 3 2 0 0 , U S S U R V E Y F E E T DS C A I D : DC 9 2 0 0 4 7 ATTACHMENT 15 LABORATORY ANALYTICAL REPORT ANALYTICAL REPORT February 22, 2024 ATC Group Services LLC Sample Delivery Group:L1706705 Samples Received:02/16/2024 Project Number: Description:South Gate Cleaners Site:DC920047 Report To:Jeremy Robbins 2725 E. Millbrook Road, Ste 121 Raleigh, NC 27604 Entire Report Reviewed By: February 22, 2024 [Preliminary Report] Heather J Wagner Project Manager Results relate only to the items tested or calibrated and are reported as rounded values. This test report shall not be reproduced, except in full, without written approval of the laboratory. Where applicable, sampling conducted by Pace Analytical National is performed per guidance provided in laboratory standard operating procedures ENV-SOP-MTJL-0067 and ENV-SOP-MTJL-0068. Where sampling conducted by the customer, results relate to the accuracy of the information provided, and as the samples are received. Pace Analytical National 12065 Lebanon Rd Mount Juliet, TN 37122 615-758-5858 800-767-5859 www.pacenational.com 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 1 of 24 February 22, 2024 Heather J Wagner Project Manager ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 1 of 24 TABLE OF CONTENTS Cp: Cover Page 1 Tc: Table of Contents 2 Ss: Sample Summary 3 Cn: Case Narrative 4 Sr: Sample Results 5 MW-2 L1706705-01 5 MW-5 L1706705-02 7 MW-7 L1706705-03 9 MW-8 L1706705-04 11 Qc: Quality Control Summary 13 Volatile Organic Compounds (GC/MS) by Method 8260D 13 Gl: Glossary of Terms 22 Al: Accreditations & Locations 23 Sc: Sample Chain of Custody 24 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 2 of 24 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 2 of 24 SAMPLE SUMMARY Collected by Collected date/time Received date/time MW-2 L1706705-01 GW GL 02/15/24 09:05 02/16/24 09:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260D WG2230357 1 02/22/24 07:33 02/22/24 07:33 ACG Mt. Juliet, TN Collected by Collected date/time Received date/time MW-5 L1706705-02 GW GL 02/15/24 10:18 02/16/24 09:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260D WG2229279 1 02/19/24 16:43 02/19/24 16:43 DYW Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260D WG2230285 1 02/21/24 01:17 02/21/24 01:17 DYW Mt. Juliet, TN Collected by Collected date/time Received date/time MW-7 L1706705-03 GW GL 02/15/24 11:07 02/16/24 09:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260D WG2229279 1 02/19/24 17:02 02/19/24 17:02 DYW Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260D WG2230285 1 02/21/24 01:37 02/21/24 01:37 DYW Mt. Juliet, TN Collected by Collected date/time Received date/time MW-8 L1706705-04 GW GL 02/15/24 11:56 02/16/24 09:00 Method Batch Dilution Preparation Analysis Analyst Location date/time date/time Volatile Organic Compounds (GC/MS) by Method 8260D WG2229279 1 02/19/24 17:21 02/19/24 17:21 DYW Mt. Juliet, TN Volatile Organic Compounds (GC/MS) by Method 8260D WG2230285 1 02/21/24 01:58 02/21/24 01:58 DYW Mt. Juliet, TN 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 3 of 24 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 3 of 24 CASE NARRATIVE All sample aliquots were received at the correct temperature, in the proper containers, with the appropriate preservatives, and within method specified holding times, unless qualified or notated within the report. Where applicable, all MDL (LOD) and RDL (LOQ) values reported for environmental samples have been corrected for the dilution factor used in the analysis. All Method and Batch Quality Control are within established criteria except where addressed in this case narrative, a non-conformance form or properly qualified within the sample results. By my digital signature below, I affirm to the best of my knowledge, all problems/anomalies observed by the laboratory as having the potential to affect the quality of the data have been identified by the laboratory, and no information or data have been knowingly withheld that would affect the quality of the data. [Preliminary Report] Heather J Wagner Project Manager 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 4 of 24 Heather J Wagner Project Manager ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 4 of 24 SAMPLE RESULTS - 01 L1706705 MW-2 Collected date/time: 02/15/24 09:05 Volatile Organic Compounds (GC/MS) by Method 8260D Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Acetone U J4 11.3 25.0 1 02/22/2024 07:33 WG2230357 Acrylonitrile U 0.671 5.00 1 02/22/2024 07:33 WG2230357 Benzene U 0.0941 0.500 1 02/22/2024 07:33 WG2230357 Bromobenzene U 0.118 0.500 1 02/22/2024 07:33 WG2230357 Bromodichloromethane U 0.136 0.500 1 02/22/2024 07:33 WG2230357 Bromochloromethane U 0.128 0.500 1 02/22/2024 07:33 WG2230357 Bromoform U 0.129 0.500 1 02/22/2024 07:33 WG2230357 Bromomethane U 0.605 2.50 1 02/22/2024 07:33 WG2230357 n-Butylbenzene U 0.157 0.500 1 02/22/2024 07:33 WG2230357 sec-Butylbenzene U 0.125 0.500 1 02/22/2024 07:33 WG2230357 tert-Butylbenzene U 0.127 0.500 1 02/22/2024 07:33 WG2230357 Carbon disulfide U 0.0962 0.500 1 02/22/2024 07:33 WG2230357 Carbon tetrachloride U 0.128 0.500 1 02/22/2024 07:33 WG2230357 Chlorobenzene U 0.117 0.500 1 02/22/2024 07:33 WG2230357 Chlorodibromomethane U 0.140 0.500 1 02/22/2024 07:33 WG2230357 Chloroethane U 0.192 2.50 1 02/22/2024 07:33 WG2230357 Chloroform U 0.111 0.500 1 02/22/2024 07:33 WG2230357 Chloromethane U 0.960 1.25 1 02/22/2024 07:33 WG2230357 2-Chlorotoluene U 0.106 0.500 1 02/22/2024 07:33 WG2230357 4-Chlorotoluene U 0.114 0.500 1 02/22/2024 07:33 WG2230357 1,2-Dibromo-3-Chloropropane U 0.276 2.50 1 02/22/2024 07:33 WG2230357 1,2-Dibromoethane U 0.126 0.500 1 02/22/2024 07:33 WG2230357 Dibromomethane U 0.122 0.500 1 02/22/2024 07:33 WG2230357 1,2-Dichlorobenzene U 0.107 0.500 1 02/22/2024 07:33 WG2230357 1,3-Dichlorobenzene U 0.299 0.500 1 02/22/2024 07:33 WG2230357 1,4-Dichlorobenzene U 0.120 0.500 1 02/22/2024 07:33 WG2230357 Dichlorodifluoromethane U 0.374 2.50 1 02/22/2024 07:33 WG2230357 1,1-Dichloroethane U 0.100 0.500 1 02/22/2024 07:33 WG2230357 1,2-Dichloroethane U 0.0819 0.500 1 02/22/2024 07:33 WG2230357 1,1-Dichloroethene U 0.188 0.500 1 02/22/2024 07:33 WG2230357 cis-1,2-Dichloroethene U 0.126 0.500 1 02/22/2024 07:33 WG2230357 trans-1,2-Dichloroethene U 0.149 0.500 1 02/22/2024 07:33 WG2230357 1,2-Dichloropropane U 0.149 0.500 1 02/22/2024 07:33 WG2230357 1,1-Dichloropropene U 0.142 0.500 1 02/22/2024 07:33 WG2230357 1,3-Dichloropropane U 0.109 1.00 1 02/22/2024 07:33 WG2230357 cis-1,3-Dichloropropene U 0.111 0.500 1 02/22/2024 07:33 WG2230357 trans-1,3-Dichloropropene U 0.118 0.500 1 02/22/2024 07:33 WG2230357 trans-1,4-Dichloro-2-butene U C3 0.467 5.00 1 02/22/2024 07:33 WG2230357 2,2-Dichloropropane U 0.161 0.500 1 02/22/2024 07:33 WG2230357 Di-isopropyl ether U 0.105 0.500 1 02/22/2024 07:33 WG2230357 Ethylbenzene U 0.137 0.500 1 02/22/2024 07:33 WG2230357 Hexachloro-1,3-butadiene U 0.337 1.00 1 02/22/2024 07:33 WG2230357 2-Hexanone U 0.787 5.00 1 02/22/2024 07:33 WG2230357 n-Hexane U 0.749 5.00 1 02/22/2024 07:33 WG2230357 Iodomethane U 0.554 5.00 1 02/22/2024 07:33 WG2230357 Isopropylbenzene U 0.105 0.500 1 02/22/2024 07:33 WG2230357 p-Isopropyltoluene U 0.120 0.500 1 02/22/2024 07:33 WG2230357 2-Butanone (MEK)U 1.19 5.00 1 02/22/2024 07:33 WG2230357 Methylene Chloride U 0.430 2.50 1 02/22/2024 07:33 WG2230357 4-Methyl-2-pentanone (MIBK)U 0.478 5.00 1 02/22/2024 07:33 WG2230357 Methyl tert-butyl ether U 0.101 0.500 1 02/22/2024 07:33 WG2230357 Naphthalene U C3 0.174 2.50 1 02/22/2024 07:33 WG2230357 n-Propylbenzene U 0.0993 0.500 1 02/22/2024 07:33 WG2230357 Styrene U 0.118 0.500 1 02/22/2024 07:33 WG2230357 1,1,1,2-Tetrachloroethane U 0.147 0.500 1 02/22/2024 07:33 WG2230357 1,1,2,2-Tetrachloroethane U C3 0.133 0.500 1 02/22/2024 07:33 WG2230357 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 5 of 24 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 5 of 24 SAMPLE RESULTS - 01 L1706705 MW-2 Collected date/time: 02/15/24 09:05 Volatile Organic Compounds (GC/MS) by Method 8260D Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time 1,1,2-Trichlorotrifluoroethane 0.824 0.180 0.500 1 02/22/2024 07:33 WG2230357 Tetrachloroethene 1.03 C5 0.300 0.500 1 02/22/2024 07:33 WG2230357 Toluene U 0.278 0.500 1 02/22/2024 07:33 WG2230357 1,2,3-Trichlorobenzene U C3 0.164 0.500 1 02/22/2024 07:33 WG2230357 1,2,4-Trichlorobenzene U 0.481 1.00 1 02/22/2024 07:33 WG2230357 1,1,1-Trichloroethane U 0.149 0.500 1 02/22/2024 07:33 WG2230357 1,1,2-Trichloroethane U 0.158 0.500 1 02/22/2024 07:33 WG2230357 Trichloroethene U J4 0.190 0.500 1 02/22/2024 07:33 WG2230357 Trichlorofluoromethane U 0.160 2.50 1 02/22/2024 07:33 WG2230357 1,2,3-Trichloropropane U 0.237 2.50 1 02/22/2024 07:33 WG2230357 1,2,4-Trimethylbenzene U 0.322 0.500 1 02/22/2024 07:33 WG2230357 1,2,3-Trimethylbenzene U 0.104 0.500 1 02/22/2024 07:33 WG2230357 1,3,5-Trimethylbenzene U 0.104 0.500 1 02/22/2024 07:33 WG2230357 Vinyl acetate U C3 0.692 5.00 1 02/22/2024 07:33 WG2230357 Vinyl chloride U 0.234 0.500 1 02/22/2024 07:33 WG2230357 Xylenes, Total U 0.174 1.50 1 02/22/2024 07:33 WG2230357 (S) Toluene-d8 106 80.0-120 02/22/2024 07:33 WG2230357 (S) 4-Bromofluorobenzene 103 77.0-126 02/22/2024 07:33 WG2230357 (S) 1,2-Dichloroethane-d4 114 70.0-130 02/22/2024 07:33 WG2230357 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 6 of 24 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 6 of 24 SAMPLE RESULTS - 02 L1706705 MW-5 Collected date/time: 02/15/24 10:18 Volatile Organic Compounds (GC/MS) by Method 8260D Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Acetone U 11.3 25.0 1 02/19/2024 16:43 WG2229279 Acrylonitrile U 0.671 5.00 1 02/19/2024 16:43 WG2229279 Benzene U 0.0941 0.500 1 02/19/2024 16:43 WG2229279 Bromobenzene U 0.118 0.500 1 02/19/2024 16:43 WG2229279 Bromodichloromethane U 0.136 0.500 1 02/19/2024 16:43 WG2229279 Bromochloromethane U 0.128 0.500 1 02/19/2024 16:43 WG2229279 Bromoform U 0.129 0.500 1 02/19/2024 16:43 WG2229279 Bromomethane U 0.605 2.50 1 02/19/2024 16:43 WG2229279 n-Butylbenzene U 0.157 0.500 1 02/19/2024 16:43 WG2229279 sec-Butylbenzene U 0.125 0.500 1 02/19/2024 16:43 WG2229279 tert-Butylbenzene U 0.127 0.500 1 02/19/2024 16:43 WG2229279 Carbon disulfide U 0.0962 0.500 1 02/19/2024 16:43 WG2229279 Carbon tetrachloride U 0.128 0.500 1 02/19/2024 16:43 WG2229279 Chlorobenzene U 0.117 0.500 1 02/19/2024 16:43 WG2229279 Chlorodibromomethane U 0.140 0.500 1 02/19/2024 16:43 WG2229279 Chloroethane U 0.192 2.50 1 02/19/2024 16:43 WG2229279 Chloroform 0.500 J 0.111 0.500 1 02/19/2024 16:43 WG2229279 Chloromethane U C3 0.960 1.25 1 02/19/2024 16:43 WG2229279 2-Chlorotoluene U 0.106 0.500 1 02/19/2024 16:43 WG2229279 4-Chlorotoluene U 0.114 0.500 1 02/19/2024 16:43 WG2229279 1,2-Dibromo-3-Chloropropane U 0.276 2.50 1 02/19/2024 16:43 WG2229279 1,2-Dibromoethane U 0.126 0.500 1 02/19/2024 16:43 WG2229279 Dibromomethane U 0.122 0.500 1 02/19/2024 16:43 WG2229279 1,2-Dichlorobenzene U 0.107 0.500 1 02/19/2024 16:43 WG2229279 1,3-Dichlorobenzene U 0.299 0.500 1 02/19/2024 16:43 WG2229279 1,4-Dichlorobenzene U 0.120 0.500 1 02/19/2024 16:43 WG2229279 Dichlorodifluoromethane U C3 0.374 2.50 1 02/19/2024 16:43 WG2229279 1,1-Dichloroethane U 0.100 0.500 1 02/19/2024 16:43 WG2229279 1,2-Dichloroethane 0.880 0.0819 0.500 1 02/19/2024 16:43 WG2229279 1,1-Dichloroethene U 0.188 0.500 1 02/19/2024 16:43 WG2229279 cis-1,2-Dichloroethene U 0.126 0.500 1 02/19/2024 16:43 WG2229279 trans-1,2-Dichloroethene U 0.149 0.500 1 02/19/2024 16:43 WG2229279 1,2-Dichloropropane U J4 0.149 0.500 1 02/19/2024 16:43 WG2229279 1,1-Dichloropropene U 0.142 0.500 1 02/19/2024 16:43 WG2229279 1,3-Dichloropropane U 0.109 1.00 1 02/19/2024 16:43 WG2229279 cis-1,3-Dichloropropene U 0.111 0.500 1 02/19/2024 16:43 WG2229279 trans-1,3-Dichloropropene U 0.118 0.500 1 02/19/2024 16:43 WG2229279 trans-1,4-Dichloro-2-butene U C3 0.467 5.00 1 02/19/2024 16:43 WG2229279 2,2-Dichloropropane U 0.161 0.500 1 02/19/2024 16:43 WG2229279 Di-isopropyl ether U 0.105 0.500 1 02/21/2024 01:17 WG2230285 Ethylbenzene U 0.137 0.500 1 02/19/2024 16:43 WG2229279 Hexachloro-1,3-butadiene U 0.337 1.00 1 02/19/2024 16:43 WG2229279 2-Hexanone U C3 0.787 5.00 1 02/19/2024 16:43 WG2229279 n-Hexane U C3 0.749 5.00 1 02/19/2024 16:43 WG2229279 Iodomethane U 0.554 5.00 1 02/19/2024 16:43 WG2229279 Isopropylbenzene U 0.105 0.500 1 02/19/2024 16:43 WG2229279 p-Isopropyltoluene U 0.120 0.500 1 02/19/2024 16:43 WG2229279 2-Butanone (MEK)U 1.19 5.00 1 02/19/2024 16:43 WG2229279 Methylene Chloride U 0.430 2.50 1 02/19/2024 16:43 WG2229279 4-Methyl-2-pentanone (MIBK)U 0.478 5.00 1 02/19/2024 16:43 WG2229279 Methyl tert-butyl ether 0.731 0.101 0.500 1 02/19/2024 16:43 WG2229279 Naphthalene U 0.174 2.50 1 02/19/2024 16:43 WG2229279 n-Propylbenzene U 0.0993 0.500 1 02/19/2024 16:43 WG2229279 Styrene U 0.118 0.500 1 02/19/2024 16:43 WG2229279 1,1,1,2-Tetrachloroethane U 0.147 0.500 1 02/19/2024 16:43 WG2229279 1,1,2,2-Tetrachloroethane U 0.133 0.500 1 02/19/2024 16:43 WG2229279 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 7 of 24 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 7 of 24 SAMPLE RESULTS - 02 L1706705 MW-5 Collected date/time: 02/15/24 10:18 Volatile Organic Compounds (GC/MS) by Method 8260D Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time 1,1,2-Trichlorotrifluoroethane U 0.180 0.500 1 02/19/2024 16:43 WG2229279 Tetrachloroethene 0.449 J 0.300 0.500 1 02/19/2024 16:43 WG2229279 Toluene U 0.278 0.500 1 02/19/2024 16:43 WG2229279 1,2,3-Trichlorobenzene U 0.164 0.500 1 02/19/2024 16:43 WG2229279 1,2,4-Trichlorobenzene U 0.481 1.00 1 02/19/2024 16:43 WG2229279 1,1,1-Trichloroethane U 0.149 0.500 1 02/19/2024 16:43 WG2229279 1,1,2-Trichloroethane U 0.158 0.500 1 02/19/2024 16:43 WG2229279 Trichloroethene U 0.190 0.500 1 02/19/2024 16:43 WG2229279 Trichlorofluoromethane U 0.160 2.50 1 02/19/2024 16:43 WG2229279 1,2,3-Trichloropropane U 0.237 2.50 1 02/19/2024 16:43 WG2229279 1,2,4-Trimethylbenzene U 0.322 0.500 1 02/19/2024 16:43 WG2229279 1,2,3-Trimethylbenzene U 0.104 0.500 1 02/19/2024 16:43 WG2229279 1,3,5-Trimethylbenzene U 0.104 0.500 1 02/19/2024 16:43 WG2229279 Vinyl acetate U 0.692 5.00 1 02/19/2024 16:43 WG2229279 Vinyl chloride U 0.234 0.500 1 02/19/2024 16:43 WG2229279 Xylenes, Total U 0.174 1.50 1 02/19/2024 16:43 WG2229279 (S) Toluene-d8 105 80.0-120 02/19/2024 16:43 WG2229279 (S) Toluene-d8 101 80.0-120 02/21/2024 01:17 WG2230285 (S) 4-Bromofluorobenzene 93.4 77.0-126 02/19/2024 16:43 WG2229279 (S) 4-Bromofluorobenzene 94.7 77.0-126 02/21/2024 01:17 WG2230285 (S) 1,2-Dichloroethane-d4 113 70.0-130 02/19/2024 16:43 WG2229279 (S) 1,2-Dichloroethane-d4 97.0 70.0-130 02/21/2024 01:17 WG2230285 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 8 of 24 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 8 of 24 SAMPLE RESULTS - 03 L1706705 MW-7 Collected date/time: 02/15/24 11:07 Volatile Organic Compounds (GC/MS) by Method 8260D Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Acetone U 11.3 25.0 1 02/19/2024 17:02 WG2229279 Acrylonitrile U 0.671 5.00 1 02/19/2024 17:02 WG2229279 Benzene U 0.0941 0.500 1 02/19/2024 17:02 WG2229279 Bromobenzene U 0.118 0.500 1 02/19/2024 17:02 WG2229279 Bromodichloromethane U 0.136 0.500 1 02/19/2024 17:02 WG2229279 Bromochloromethane U 0.128 0.500 1 02/19/2024 17:02 WG2229279 Bromoform U 0.129 0.500 1 02/19/2024 17:02 WG2229279 Bromomethane U 0.605 2.50 1 02/19/2024 17:02 WG2229279 n-Butylbenzene U 0.157 0.500 1 02/19/2024 17:02 WG2229279 sec-Butylbenzene U 0.125 0.500 1 02/19/2024 17:02 WG2229279 tert-Butylbenzene U 0.127 0.500 1 02/19/2024 17:02 WG2229279 Carbon disulfide U 0.0962 0.500 1 02/19/2024 17:02 WG2229279 Carbon tetrachloride U 0.128 0.500 1 02/19/2024 17:02 WG2229279 Chlorobenzene U 0.117 0.500 1 02/19/2024 17:02 WG2229279 Chlorodibromomethane U 0.140 0.500 1 02/19/2024 17:02 WG2229279 Chloroethane U 0.192 2.50 1 02/19/2024 17:02 WG2229279 Chloroform U 0.111 0.500 1 02/19/2024 17:02 WG2229279 Chloromethane U C3 0.960 1.25 1 02/19/2024 17:02 WG2229279 2-Chlorotoluene U 0.106 0.500 1 02/19/2024 17:02 WG2229279 4-Chlorotoluene U 0.114 0.500 1 02/19/2024 17:02 WG2229279 1,2-Dibromo-3-Chloropropane U 0.276 2.50 1 02/19/2024 17:02 WG2229279 1,2-Dibromoethane U 0.126 0.500 1 02/19/2024 17:02 WG2229279 Dibromomethane U 0.122 0.500 1 02/19/2024 17:02 WG2229279 1,2-Dichlorobenzene U 0.107 0.500 1 02/19/2024 17:02 WG2229279 1,3-Dichlorobenzene U 0.299 0.500 1 02/19/2024 17:02 WG2229279 1,4-Dichlorobenzene U 0.120 0.500 1 02/19/2024 17:02 WG2229279 Dichlorodifluoromethane U C3 0.374 2.50 1 02/19/2024 17:02 WG2229279 1,1-Dichloroethane U 0.100 0.500 1 02/19/2024 17:02 WG2229279 1,2-Dichloroethane U 0.0819 0.500 1 02/19/2024 17:02 WG2229279 1,1-Dichloroethene U 0.188 0.500 1 02/19/2024 17:02 WG2229279 cis-1,2-Dichloroethene U 0.126 0.500 1 02/19/2024 17:02 WG2229279 trans-1,2-Dichloroethene U 0.149 0.500 1 02/19/2024 17:02 WG2229279 1,2-Dichloropropane U J4 0.149 0.500 1 02/19/2024 17:02 WG2229279 1,1-Dichloropropene U 0.142 0.500 1 02/19/2024 17:02 WG2229279 1,3-Dichloropropane U 0.109 1.00 1 02/19/2024 17:02 WG2229279 cis-1,3-Dichloropropene U 0.111 0.500 1 02/19/2024 17:02 WG2229279 trans-1,3-Dichloropropene U 0.118 0.500 1 02/19/2024 17:02 WG2229279 trans-1,4-Dichloro-2-butene U C3 0.467 5.00 1 02/19/2024 17:02 WG2229279 2,2-Dichloropropane U 0.161 0.500 1 02/19/2024 17:02 WG2229279 Di-isopropyl ether 0.210 J 0.105 0.500 1 02/21/2024 01:37 WG2230285 Ethylbenzene U 0.137 0.500 1 02/19/2024 17:02 WG2229279 Hexachloro-1,3-butadiene U 0.337 1.00 1 02/19/2024 17:02 WG2229279 2-Hexanone U C3 0.787 5.00 1 02/19/2024 17:02 WG2229279 n-Hexane U C3 0.749 5.00 1 02/19/2024 17:02 WG2229279 Iodomethane U 0.554 5.00 1 02/19/2024 17:02 WG2229279 Isopropylbenzene U 0.105 0.500 1 02/19/2024 17:02 WG2229279 p-Isopropyltoluene U 0.120 0.500 1 02/19/2024 17:02 WG2229279 2-Butanone (MEK)U 1.19 5.00 1 02/19/2024 17:02 WG2229279 Methylene Chloride U 0.430 2.50 1 02/19/2024 17:02 WG2229279 4-Methyl-2-pentanone (MIBK)U 0.478 5.00 1 02/19/2024 17:02 WG2229279 Methyl tert-butyl ether 0.521 0.101 0.500 1 02/19/2024 17:02 WG2229279 Naphthalene U 0.174 2.50 1 02/19/2024 17:02 WG2229279 n-Propylbenzene U 0.0993 0.500 1 02/19/2024 17:02 WG2229279 Styrene U 0.118 0.500 1 02/19/2024 17:02 WG2229279 1,1,1,2-Tetrachloroethane U 0.147 0.500 1 02/19/2024 17:02 WG2229279 1,1,2,2-Tetrachloroethane U 0.133 0.500 1 02/19/2024 17:02 WG2229279 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 9 of 24 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 9 of 24 SAMPLE RESULTS - 03 L1706705 MW-7 Collected date/time: 02/15/24 11:07 Volatile Organic Compounds (GC/MS) by Method 8260D Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time 1,1,2-Trichlorotrifluoroethane 0.756 0.180 0.500 1 02/19/2024 17:02 WG2229279 Tetrachloroethene 31.1 0.300 0.500 1 02/19/2024 17:02 WG2229279 Toluene U 0.278 0.500 1 02/19/2024 17:02 WG2229279 1,2,3-Trichlorobenzene U 0.164 0.500 1 02/19/2024 17:02 WG2229279 1,2,4-Trichlorobenzene U 0.481 1.00 1 02/19/2024 17:02 WG2229279 1,1,1-Trichloroethane U 0.149 0.500 1 02/19/2024 17:02 WG2229279 1,1,2-Trichloroethane U 0.158 0.500 1 02/19/2024 17:02 WG2229279 Trichloroethene 0.206 J 0.190 0.500 1 02/19/2024 17:02 WG2229279 Trichlorofluoromethane U 0.160 2.50 1 02/19/2024 17:02 WG2229279 1,2,3-Trichloropropane U 0.237 2.50 1 02/19/2024 17:02 WG2229279 1,2,4-Trimethylbenzene U 0.322 0.500 1 02/19/2024 17:02 WG2229279 1,2,3-Trimethylbenzene U 0.104 0.500 1 02/19/2024 17:02 WG2229279 1,3,5-Trimethylbenzene U 0.104 0.500 1 02/19/2024 17:02 WG2229279 Vinyl acetate U 0.692 5.00 1 02/19/2024 17:02 WG2229279 Vinyl chloride U 0.234 0.500 1 02/19/2024 17:02 WG2229279 Xylenes, Total U 0.174 1.50 1 02/19/2024 17:02 WG2229279 (S) Toluene-d8 103 80.0-120 02/19/2024 17:02 WG2229279 (S) Toluene-d8 102 80.0-120 02/21/2024 01:37 WG2230285 (S) 4-Bromofluorobenzene 90.1 77.0-126 02/19/2024 17:02 WG2229279 (S) 4-Bromofluorobenzene 96.5 77.0-126 02/21/2024 01:37 WG2230285 (S) 1,2-Dichloroethane-d4 112 70.0-130 02/19/2024 17:02 WG2229279 (S) 1,2-Dichloroethane-d4 93.6 70.0-130 02/21/2024 01:37 WG2230285 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 10 of 24 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 10 of 24 SAMPLE RESULTS - 04 L1706705 MW-8 Collected date/time: 02/15/24 11:56 Volatile Organic Compounds (GC/MS) by Method 8260D Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time Acetone U 11.3 25.0 1 02/19/2024 17:21 WG2229279 Acrylonitrile U 0.671 5.00 1 02/19/2024 17:21 WG2229279 Benzene U 0.0941 0.500 1 02/19/2024 17:21 WG2229279 Bromobenzene U 0.118 0.500 1 02/19/2024 17:21 WG2229279 Bromodichloromethane U 0.136 0.500 1 02/19/2024 17:21 WG2229279 Bromochloromethane U 0.128 0.500 1 02/19/2024 17:21 WG2229279 Bromoform U 0.129 0.500 1 02/19/2024 17:21 WG2229279 Bromomethane U 0.605 2.50 1 02/19/2024 17:21 WG2229279 n-Butylbenzene U 0.157 0.500 1 02/19/2024 17:21 WG2229279 sec-Butylbenzene U 0.125 0.500 1 02/19/2024 17:21 WG2229279 tert-Butylbenzene U 0.127 0.500 1 02/19/2024 17:21 WG2229279 Carbon disulfide U 0.0962 0.500 1 02/19/2024 17:21 WG2229279 Carbon tetrachloride U 0.128 0.500 1 02/19/2024 17:21 WG2229279 Chlorobenzene U 0.117 0.500 1 02/19/2024 17:21 WG2229279 Chlorodibromomethane U 0.140 0.500 1 02/19/2024 17:21 WG2229279 Chloroethane U 0.192 2.50 1 02/19/2024 17:21 WG2229279 Chloroform U 0.111 0.500 1 02/19/2024 17:21 WG2229279 Chloromethane U C3 0.960 1.25 1 02/19/2024 17:21 WG2229279 2-Chlorotoluene U 0.106 0.500 1 02/19/2024 17:21 WG2229279 4-Chlorotoluene U 0.114 0.500 1 02/19/2024 17:21 WG2229279 1,2-Dibromo-3-Chloropropane U 0.276 2.50 1 02/19/2024 17:21 WG2229279 1,2-Dibromoethane U 0.126 0.500 1 02/19/2024 17:21 WG2229279 Dibromomethane U 0.122 0.500 1 02/19/2024 17:21 WG2229279 1,2-Dichlorobenzene U 0.107 0.500 1 02/19/2024 17:21 WG2229279 1,3-Dichlorobenzene U 0.299 0.500 1 02/19/2024 17:21 WG2229279 1,4-Dichlorobenzene U 0.120 0.500 1 02/19/2024 17:21 WG2229279 Dichlorodifluoromethane U C3 0.374 2.50 1 02/19/2024 17:21 WG2229279 1,1-Dichloroethane U 0.100 0.500 1 02/19/2024 17:21 WG2229279 1,2-Dichloroethane U 0.0819 0.500 1 02/19/2024 17:21 WG2229279 1,1-Dichloroethene U 0.188 0.500 1 02/19/2024 17:21 WG2229279 cis-1,2-Dichloroethene U 0.126 0.500 1 02/19/2024 17:21 WG2229279 trans-1,2-Dichloroethene U 0.149 0.500 1 02/19/2024 17:21 WG2229279 1,2-Dichloropropane U J4 0.149 0.500 1 02/19/2024 17:21 WG2229279 1,1-Dichloropropene U 0.142 0.500 1 02/19/2024 17:21 WG2229279 1,3-Dichloropropane U 0.109 1.00 1 02/19/2024 17:21 WG2229279 cis-1,3-Dichloropropene U 0.111 0.500 1 02/19/2024 17:21 WG2229279 trans-1,3-Dichloropropene U 0.118 0.500 1 02/19/2024 17:21 WG2229279 trans-1,4-Dichloro-2-butene U C3 0.467 5.00 1 02/19/2024 17:21 WG2229279 2,2-Dichloropropane U 0.161 0.500 1 02/19/2024 17:21 WG2229279 Di-isopropyl ether U 0.105 0.500 1 02/21/2024 01:58 WG2230285 Ethylbenzene U 0.137 0.500 1 02/19/2024 17:21 WG2229279 Hexachloro-1,3-butadiene U 0.337 1.00 1 02/19/2024 17:21 WG2229279 2-Hexanone U C3 0.787 5.00 1 02/19/2024 17:21 WG2229279 n-Hexane U C3 0.749 5.00 1 02/19/2024 17:21 WG2229279 Iodomethane U 0.554 5.00 1 02/19/2024 17:21 WG2229279 Isopropylbenzene U 0.105 0.500 1 02/19/2024 17:21 WG2229279 p-Isopropyltoluene U 0.120 0.500 1 02/19/2024 17:21 WG2229279 2-Butanone (MEK)U 1.19 5.00 1 02/19/2024 17:21 WG2229279 Methylene Chloride U 0.430 2.50 1 02/19/2024 17:21 WG2229279 4-Methyl-2-pentanone (MIBK)U 0.478 5.00 1 02/19/2024 17:21 WG2229279 Methyl tert-butyl ether U 0.101 0.500 1 02/19/2024 17:21 WG2229279 Naphthalene U 0.174 2.50 1 02/19/2024 17:21 WG2229279 n-Propylbenzene U 0.0993 0.500 1 02/19/2024 17:21 WG2229279 Styrene U 0.118 0.500 1 02/19/2024 17:21 WG2229279 1,1,1,2-Tetrachloroethane U 0.147 0.500 1 02/19/2024 17:21 WG2229279 1,1,2,2-Tetrachloroethane U 0.133 0.500 1 02/19/2024 17:21 WG2229279 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 11 of 24 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 11 of 24 SAMPLE RESULTS - 04 L1706705 MW-8 Collected date/time: 02/15/24 11:56 Volatile Organic Compounds (GC/MS) by Method 8260D Result Qualifier MDL RDL Dilution Analysis Batch Analyte ug/l ug/l ug/l date / time 1,1,2-Trichlorotrifluoroethane U 0.180 0.500 1 02/19/2024 17:21 WG2229279 Tetrachloroethene 2.38 0.300 0.500 1 02/19/2024 17:21 WG2229279 Toluene U 0.278 0.500 1 02/19/2024 17:21 WG2229279 1,2,3-Trichlorobenzene U 0.164 0.500 1 02/19/2024 17:21 WG2229279 1,2,4-Trichlorobenzene U 0.481 1.00 1 02/19/2024 17:21 WG2229279 1,1,1-Trichloroethane U 0.149 0.500 1 02/19/2024 17:21 WG2229279 1,1,2-Trichloroethane U 0.158 0.500 1 02/19/2024 17:21 WG2229279 Trichloroethene U 0.190 0.500 1 02/19/2024 17:21 WG2229279 Trichlorofluoromethane U 0.160 2.50 1 02/19/2024 17:21 WG2229279 1,2,3-Trichloropropane U 0.237 2.50 1 02/19/2024 17:21 WG2229279 1,2,4-Trimethylbenzene U 0.322 0.500 1 02/19/2024 17:21 WG2229279 1,2,3-Trimethylbenzene U 0.104 0.500 1 02/19/2024 17:21 WG2229279 1,3,5-Trimethylbenzene U 0.104 0.500 1 02/19/2024 17:21 WG2229279 Vinyl acetate U 0.692 5.00 1 02/19/2024 17:21 WG2229279 Vinyl chloride U 0.234 0.500 1 02/19/2024 17:21 WG2229279 Xylenes, Total U 0.174 1.50 1 02/19/2024 17:21 WG2229279 (S) Toluene-d8 107 80.0-120 02/19/2024 17:21 WG2229279 (S) Toluene-d8 102 80.0-120 02/21/2024 01:58 WG2230285 (S) 4-Bromofluorobenzene 93.3 77.0-126 02/19/2024 17:21 WG2229279 (S) 4-Bromofluorobenzene 92.8 77.0-126 02/21/2024 01:58 WG2230285 (S) 1,2-Dichloroethane-d4 115 70.0-130 02/19/2024 17:21 WG2229279 (S) 1,2-Dichloroethane-d4 90.8 70.0-130 02/21/2024 01:58 WG2230285 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 12 of 24 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 12 of 24 QUALITY CONTROL SUMMARYWG2229279 Volatile Organic Compounds (GC/MS) by Method 8260D L1706705-02,03,04 Method Blank (MB) (MB) R4036147-3 02/19/24 10:12 MB Result MB Qualifier MB MDL MB RDL Analyte ug/l ug/l ug/l Acetone U 11.3 25.0 Acrylonitrile U 0.671 5.00 Benzene U 0.0941 0.500 Bromobenzene U 0.118 0.500 Bromodichloromethane U 0.136 0.500 Bromochloromethane U 0.128 0.500 Bromoform U 0.129 0.500 Bromomethane U 0.605 2.50 n-Butylbenzene U 0.157 0.500 sec-Butylbenzene U 0.125 0.500 tert-Butylbenzene U 0.127 0.500 Carbon disulfide U 0.0962 0.500 Carbon tetrachloride U 0.128 0.500 Chlorobenzene U 0.117 0.500 Chlorodibromomethane U 0.140 0.500 Chloroethane U 0.192 2.50 Chloroform U 0.111 0.500 Chloromethane U 0.960 1.25 2-Chlorotoluene U 0.106 0.500 4-Chlorotoluene U 0.114 0.500 1,2-Dibromo-3-Chloropropane U 0.276 2.50 1,2-Dibromoethane U 0.126 0.500 Dibromomethane U 0.122 0.500 1,2-Dichlorobenzene U 0.107 0.500 1,3-Dichlorobenzene U 0.299 0.500 1,4-Dichlorobenzene U 0.120 0.500 Dichlorodifluoromethane U 0.374 2.50 1,1-Dichloroethane U 0.100 0.500 1,2-Dichloroethane U 0.0819 0.500 1,1-Dichloroethene U 0.188 0.500 cis-1,2-Dichloroethene U 0.126 0.500 trans-1,2-Dichloroethene U 0.149 0.500 1,2-Dichloropropane U 0.149 0.500 1,1-Dichloropropene U 0.142 0.500 1,3-Dichloropropane U 0.109 1.00 cis-1,3-Dichloropropene U 0.111 0.500 trans-1,3-Dichloropropene U 0.118 0.500 trans-1,4-Dichloro-2-butene U 0.467 5.00 2,2-Dichloropropane U 0.161 0.500 Ethylbenzene U 0.137 0.500 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 13 of 24 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 13 of 24 QUALITY CONTROL SUMMARYWG2229279 Volatile Organic Compounds (GC/MS) by Method 8260D L1706705-02,03,04 Method Blank (MB) (MB) R4036147-3 02/19/24 10:12 MB Result MB Qualifier MB MDL MB RDL Analyte ug/l ug/l ug/l Hexachloro-1,3-butadiene U 0.337 1.00 2-Hexanone U 0.787 5.00 n-Hexane U 0.749 5.00 Iodomethane U 0.554 5.00 Isopropylbenzene U 0.105 0.500 p-Isopropyltoluene U 0.120 0.500 2-Butanone (MEK)U 1.19 5.00 Methylene Chloride U 0.430 2.50 4-Methyl-2-pentanone (MIBK)U 0.478 5.00 Methyl tert-butyl ether U 0.101 0.500 Naphthalene U 0.174 2.50 n-Propylbenzene U 0.0993 0.500 Styrene U 0.118 0.500 1,1,1,2-Tetrachloroethane U 0.147 0.500 1,1,2,2-Tetrachloroethane U 0.133 0.500 1,1,2-Trichlorotrifluoroethane U 0.180 0.500 Tetrachloroethene U 0.300 0.500 Toluene U 0.278 0.500 1,2,3-Trichlorobenzene U 0.164 0.500 1,2,4-Trichlorobenzene U 0.481 1.00 1,1,1-Trichloroethane U 0.149 0.500 1,1,2-Trichloroethane U 0.158 0.500 Trichloroethene U 0.190 0.500 Trichlorofluoromethane U 0.160 2.50 1,2,3-Trichloropropane U 0.237 2.50 1,2,4-Trimethylbenzene U 0.322 0.500 1,2,3-Trimethylbenzene U 0.104 0.500 1,3,5-Trimethylbenzene U 0.104 0.500 Vinyl acetate U 0.692 5.00 Vinyl chloride U 0.234 0.500 Xylenes, Total U 0.174 1.50 (S) Toluene-d8 105 80.0-120 (S) 4-Bromofluorobenzene 94.6 77.0-126 (S) 1,2-Dichloroethane-d4 109 70.0-130 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 14 of 24 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 14 of 24 QUALITY CONTROL SUMMARYWG2229279 Volatile Organic Compounds (GC/MS) by Method 8260D L1706705-02,03,04 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS) R4036147-1 02/19/24 09:15 • (LCSD) R4036147-2 02/19/24 09:34 Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits Analyte ug/l ug/l ug/l %%%%% Acetone 25.0 29.2 27.0 117 108 19.0-160 7.83 27 Acrylonitrile 25.0 21.9 21.7 87.6 86.8 55.0-149 0.917 20 Benzene 5.00 4.64 4.78 92.8 95.6 70.0-123 2.97 20 Bromobenzene 5.00 4.55 4.70 91.0 94.0 73.0-121 3.24 20 Bromodichloromethane 5.00 5.85 5.26 117 105 75.0-120 10.6 20 Bromochloromethane 5.00 5.21 5.02 104 100 76.0-122 3.71 20 Bromoform 5.00 5.32 5.51 106 110 68.0-132 3.51 20 Bromomethane 5.00 5.92 5.63 118 113 10.0-160 5.02 25 n-Butylbenzene 5.00 4.80 4.91 96.0 98.2 73.0-125 2.27 20 sec-Butylbenzene 5.00 4.50 4.55 90.0 91.0 75.0-125 1.10 20 tert-Butylbenzene 5.00 4.72 4.97 94.4 99.4 76.0-124 5.16 20 Carbon disulfide 5.00 4.52 4.33 90.4 86.6 61.0-128 4.29 20 Carbon tetrachloride 5.00 5.67 5.66 113 113 68.0-126 0.177 20 Chlorobenzene 5.00 5.14 5.10 103 102 80.0-121 0.781 20 Chlorodibromomethane 5.00 5.38 5.35 108 107 77.0-125 0.559 20 Chloroethane 5.00 4.62 4.32 92.4 86.4 47.0-150 6.71 20 Chloroform 5.00 5.30 5.44 106 109 73.0-120 2.61 20 Chloromethane 5.00 3.19 2.83 63.8 56.6 41.0-142 12.0 20 2-Chlorotoluene 5.00 4.66 4.93 93.2 98.6 76.0-123 5.63 20 4-Chlorotoluene 5.00 4.68 4.77 93.6 95.4 75.0-122 1.90 20 1,2-Dibromo-3-Chloropropane 5.00 4.87 4.83 97.4 96.6 58.0-134 0.825 20 1,2-Dibromoethane 5.00 4.95 5.31 99.0 106 80.0-122 7.02 20 Dibromomethane 5.00 4.78 4.85 95.6 97.0 80.0-120 1.45 20 1,2-Dichlorobenzene 5.00 5.06 5.44 101 109 79.0-121 7.24 20 1,3-Dichlorobenzene 5.00 5.15 4.86 103 97.2 79.0-120 5.79 20 1,4-Dichlorobenzene 5.00 5.06 5.06 101 101 79.0-120 0.000 20 Dichlorodifluoromethane 5.00 3.92 3.76 78.4 75.2 51.0-149 4.17 20 1,1-Dichloroethane 5.00 4.49 4.72 89.8 94.4 70.0-126 4.99 20 1,2-Dichloroethane 5.00 5.53 5.74 111 115 70.0-128 3.73 20 1,1-Dichloroethene 5.00 4.99 4.92 99.8 98.4 71.0-124 1.41 20 cis-1,2-Dichloroethene 5.00 4.89 4.94 97.8 98.8 73.0-120 1.02 20 trans-1,2-Dichloroethene 5.00 4.71 4.79 94.2 95.8 73.0-120 1.68 20 1,2-Dichloropropane 5.00 4.00 3.79 80.0 75.8 77.0-125 J4 5.39 20 1,1-Dichloropropene 5.00 4.73 4.60 94.6 92.0 74.0-126 2.79 20 1,3-Dichloropropane 5.00 4.75 4.65 95.0 93.0 80.0-120 2.13 20 cis-1,3-Dichloropropene 5.00 4.83 4.52 96.6 90.4 80.0-123 6.63 20 trans-1,3-Dichloropropene 5.00 5.10 5.08 102 102 78.0-124 0.393 20 trans-1,4-Dichloro-2-butene 5.00 3.98 3.73 79.6 74.6 33.0-144 6.49 20 2,2-Dichloropropane 5.00 5.77 5.64 115 113 58.0-130 2.28 20 Ethylbenzene 5.00 5.20 4.98 104 99.6 79.0-123 4.32 20 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 15 of 24 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 15 of 24 QUALITY CONTROL SUMMARYWG2229279 Volatile Organic Compounds (GC/MS) by Method 8260D L1706705-02,03,04 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS) R4036147-1 02/19/24 09:15 • (LCSD) R4036147-2 02/19/24 09:34 Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits Analyte ug/l ug/l ug/l %%%%% Hexachloro-1,3-butadiene 5.00 5.21 4.83 104 96.6 54.0-138 7.57 20 2-Hexanone 25.0 18.8 18.3 75.2 73.2 67.0-149 2.70 20 n-Hexane 5.00 3.15 3.22 63.0 64.4 57.0-133 2.20 20 Iodomethane 25.0 27.6 26.5 110 106 33.0-147 4.07 26 Isopropylbenzene 5.00 4.94 4.89 98.8 97.8 76.0-127 1.02 20 p-Isopropyltoluene 5.00 4.95 4.93 99.0 98.6 76.0-125 0.405 20 2-Butanone (MEK)25.0 22.3 21.7 89.2 86.8 44.0-160 2.73 20 Methylene Chloride 5.00 4.73 5.18 94.6 104 67.0-120 9.08 20 4-Methyl-2-pentanone (MIBK)25.0 22.0 22.4 88.0 89.6 68.0-142 1.80 20 Methyl tert-butyl ether 5.00 4.67 4.64 93.4 92.8 68.0-125 0.644 20 Naphthalene 5.00 4.51 4.49 90.2 89.8 54.0-135 0.444 20 n-Propylbenzene 5.00 4.61 4.73 92.2 94.6 77.0-124 2.57 20 Styrene 5.00 4.66 4.41 93.2 88.2 73.0-130 5.51 20 1,1,1,2-Tetrachloroethane 5.00 5.66 5.58 113 112 75.0-125 1.42 20 1,1,2,2-Tetrachloroethane 5.00 4.96 5.23 99.2 105 65.0-130 5.30 20 1,1,2-Trichlorotrifluoroethane 5.00 4.94 4.65 98.8 93.0 69.0-132 6.05 20 Tetrachloroethene 5.00 5.15 5.14 103 103 72.0-132 0.194 20 Toluene 5.00 4.99 4.80 99.8 96.0 79.0-120 3.88 20 1,2,3-Trichlorobenzene 5.00 5.05 4.87 101 97.4 50.0-138 3.63 20 1,2,4-Trichlorobenzene 5.00 4.96 4.95 99.2 99.0 57.0-137 0.202 20 1,1,1-Trichloroethane 5.00 6.10 5.81 122 116 73.0-124 4.87 20 1,1,2-Trichloroethane 5.00 4.98 4.92 99.6 98.4 80.0-120 1.21 20 Trichloroethene 5.00 4.89 4.91 97.8 98.2 78.0-124 0.408 20 Trichlorofluoromethane 5.00 5.07 4.45 101 89.0 59.0-147 13.0 20 1,2,3-Trichloropropane 5.00 4.77 4.85 95.4 97.0 73.0-130 1.66 20 1,2,4-Trimethylbenzene 5.00 4.72 4.76 94.4 95.2 76.0-121 0.844 20 1,2,3-Trimethylbenzene 5.00 4.99 4.88 99.8 97.6 77.0-120 2.23 20 1,3,5-Trimethylbenzene 5.00 4.84 4.88 96.8 97.6 76.0-122 0.823 20 Vinyl acetate 25.0 25.5 26.1 102 104 11.0-160 2.33 20 Vinyl chloride 5.00 4.17 4.01 83.4 80.2 67.0-131 3.91 20 Xylenes, Total 15.0 15.4 15.1 103 101 79.0-123 1.97 20 (S) Toluene-d8 102 104 80.0-120 (S) 4-Bromofluorobenzene 96.9 96.6 77.0-126 (S) 1,2-Dichloroethane-d4 110 115 70.0-130 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 16 of 24 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 16 of 24 QUALITY CONTROL SUMMARYWG2230285 Volatile Organic Compounds (GC/MS) by Method 8260D L1706705-02,03,04 Method Blank (MB) (MB) R4036442-2 02/20/24 22:01 MB Result MB Qualifier MB MDL MB RDL Analyte ug/l ug/l ug/l Di-isopropyl ether U 0.105 0.500 (S) Toluene-d8 98.4 80.0-120 (S) 4-Bromofluorobenzene 95.3 77.0-126 (S) 1,2-Dichloroethane-d4 94.2 70.0-130 Laboratory Control Sample (LCS) (LCS) R4036442-1 02/20/24 21:20 Spike Amount LCS Result LCS Rec.Rec. Limits LCS Qualifier Analyte ug/l ug/l %% Di-isopropyl ether 5.00 4.20 84.0 58.0-138 (S) Toluene-d8 98.7 80.0-120 (S) 4-Bromofluorobenzene 93.8 77.0-126 (S) 1,2-Dichloroethane-d4 96.9 70.0-130 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 17 of 24 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 17 of 24 QUALITY CONTROL SUMMARYWG2230357 Volatile Organic Compounds (GC/MS) by Method 8260D L1706705-01 Method Blank (MB) (MB) R4037005-3 02/22/24 01:35 MB Result MB Qualifier MB MDL MB RDL Analyte ug/l ug/l ug/l Acetone U 11.3 25.0 Acrylonitrile U 0.671 5.00 Benzene U 0.0941 0.500 Bromobenzene U 0.118 0.500 Bromodichloromethane U 0.136 0.500 Bromochloromethane U 0.128 0.500 Bromoform U 0.129 0.500 Bromomethane U 0.605 2.50 n-Butylbenzene U 0.157 0.500 sec-Butylbenzene U 0.125 0.500 tert-Butylbenzene U 0.127 0.500 Carbon disulfide U 0.0962 0.500 Carbon tetrachloride U 0.128 0.500 Chlorobenzene U 0.117 0.500 Chlorodibromomethane U 0.140 0.500 Chloroethane U 0.192 2.50 Chloroform U 0.111 0.500 Chloromethane U 0.960 1.25 2-Chlorotoluene U 0.106 0.500 4-Chlorotoluene U 0.114 0.500 1,2-Dibromo-3-Chloropropane U 0.276 2.50 1,2-Dibromoethane U 0.126 0.500 Dibromomethane U 0.122 0.500 1,2-Dichlorobenzene U 0.107 0.500 1,3-Dichlorobenzene U 0.299 0.500 1,4-Dichlorobenzene U 0.120 0.500 Dichlorodifluoromethane U 0.374 2.50 1,1-Dichloroethane U 0.100 0.500 1,2-Dichloroethane U 0.0819 0.500 1,1-Dichloroethene U 0.188 0.500 cis-1,2-Dichloroethene U 0.126 0.500 trans-1,2-Dichloroethene U 0.149 0.500 1,2-Dichloropropane U 0.149 0.500 1,1-Dichloropropene U 0.142 0.500 1,3-Dichloropropane U 0.109 1.00 cis-1,3-Dichloropropene U 0.111 0.500 trans-1,3-Dichloropropene U 0.118 0.500 trans-1,4-Dichloro-2-butene U 0.467 5.00 2,2-Dichloropropane U 0.161 0.500 Di-isopropyl ether U 0.105 0.500 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 18 of 24 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 18 of 24 QUALITY CONTROL SUMMARYWG2230357 Volatile Organic Compounds (GC/MS) by Method 8260D L1706705-01 Method Blank (MB) (MB) R4037005-3 02/22/24 01:35 MB Result MB Qualifier MB MDL MB RDL Analyte ug/l ug/l ug/l Ethylbenzene U 0.137 0.500 Hexachloro-1,3-butadiene U 0.337 1.00 2-Hexanone U 0.787 5.00 n-Hexane U 0.749 5.00 Iodomethane U 0.554 5.00 Isopropylbenzene U 0.105 0.500 p-Isopropyltoluene U 0.120 0.500 2-Butanone (MEK)U 1.19 5.00 Methylene Chloride U 0.430 2.50 4-Methyl-2-pentanone (MIBK)U 0.478 5.00 Methyl tert-butyl ether U 0.101 0.500 Naphthalene U 0.174 2.50 n-Propylbenzene U 0.0993 0.500 Styrene U 0.118 0.500 1,1,1,2-Tetrachloroethane U 0.147 0.500 1,1,2,2-Tetrachloroethane U 0.133 0.500 1,1,2-Trichlorotrifluoroethane U 0.180 0.500 Tetrachloroethene U 0.300 0.500 Toluene U 0.278 0.500 1,2,3-Trichlorobenzene U 0.164 0.500 1,2,4-Trichlorobenzene U 0.481 1.00 1,1,1-Trichloroethane U 0.149 0.500 1,1,2-Trichloroethane U 0.158 0.500 Trichloroethene U 0.190 0.500 Trichlorofluoromethane U 0.160 2.50 1,2,3-Trichloropropane U 0.237 2.50 1,2,4-Trimethylbenzene U 0.322 0.500 1,2,3-Trimethylbenzene U 0.104 0.500 1,3,5-Trimethylbenzene U 0.104 0.500 Vinyl acetate U 0.692 5.00 Vinyl chloride U 0.234 0.500 Xylenes, Total U 0.174 1.50 (S) Toluene-d8 104 80.0-120 (S) 4-Bromofluorobenzene 97.5 77.0-126 (S) 1,2-Dichloroethane-d4 115 70.0-130 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 19 of 24 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 19 of 24 QUALITY CONTROL SUMMARYWG2230357 Volatile Organic Compounds (GC/MS) by Method 8260D L1706705-01 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS) R4037005-1 02/22/24 00:34 • (LCSD) R4037005-2 02/22/24 00:54 Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits Analyte ug/l ug/l ug/l %%%%% Acetone 25.0 42.1 40.4 168 162 19.0-160 J4 J4 4.12 27 Acrylonitrile 25.0 26.4 26.3 106 105 55.0-149 0.380 20 Benzene 5.00 4.80 4.63 96.0 92.6 70.0-123 3.61 20 Bromobenzene 5.00 4.34 4.28 86.8 85.6 73.0-121 1.39 20 Bromodichloromethane 5.00 5.24 4.83 105 96.6 75.0-120 8.14 20 Bromochloromethane 5.00 5.90 5.63 118 113 76.0-122 4.68 20 Bromoform 5.00 5.77 5.77 115 115 68.0-132 0.000 20 Bromomethane 5.00 5.29 5.00 106 100 10.0-160 5.64 25 n-Butylbenzene 5.00 4.33 4.26 86.6 85.2 73.0-125 1.63 20 sec-Butylbenzene 5.00 4.36 4.29 87.2 85.8 75.0-125 1.62 20 tert-Butylbenzene 5.00 4.67 4.48 93.4 89.6 76.0-124 4.15 20 Carbon disulfide 5.00 4.97 4.60 99.4 92.0 61.0-128 7.73 20 Carbon tetrachloride 5.00 6.02 5.97 120 119 68.0-126 0.834 20 Chlorobenzene 5.00 5.31 5.19 106 104 80.0-121 2.29 20 Chlorodibromomethane 5.00 5.70 5.57 114 111 77.0-125 2.31 20 Chloroethane 5.00 5.02 4.72 100 94.4 47.0-150 6.16 20 Chloroform 5.00 5.27 5.00 105 100 73.0-120 5.26 20 Chloromethane 5.00 5.48 5.12 110 102 41.0-142 6.79 20 2-Chlorotoluene 5.00 4.52 4.35 90.4 87.0 76.0-123 3.83 20 4-Chlorotoluene 5.00 4.38 4.36 87.6 87.2 75.0-122 0.458 20 1,2-Dibromo-3-Chloropropane 5.00 4.06 4.51 81.2 90.2 58.0-134 10.5 20 1,2-Dibromoethane 5.00 5.31 5.23 106 105 80.0-122 1.52 20 Dibromomethane 5.00 5.26 5.33 105 107 80.0-120 1.32 20 1,2-Dichlorobenzene 5.00 4.75 4.82 95.0 96.4 79.0-121 1.46 20 1,3-Dichlorobenzene 5.00 4.90 4.81 98.0 96.2 79.0-120 1.85 20 1,4-Dichlorobenzene 5.00 4.91 4.91 98.2 98.2 79.0-120 0.000 20 Dichlorodifluoromethane 5.00 7.08 6.68 142 134 51.0-149 5.81 20 1,1-Dichloroethane 5.00 5.00 4.83 100 96.6 70.0-126 3.46 20 1,2-Dichloroethane 5.00 5.63 5.45 113 109 70.0-128 3.25 20 1,1-Dichloroethene 5.00 5.39 5.02 108 100 71.0-124 7.11 20 cis-1,2-Dichloroethene 5.00 5.05 4.97 101 99.4 73.0-120 1.60 20 trans-1,2-Dichloroethene 5.00 5.24 4.88 105 97.6 73.0-120 7.11 20 1,2-Dichloropropane 5.00 4.79 4.64 95.8 92.8 77.0-125 3.18 20 1,1-Dichloropropene 5.00 4.96 4.71 99.2 94.2 74.0-126 5.17 20 1,3-Dichloropropane 5.00 4.90 4.75 98.0 95.0 80.0-120 3.11 20 cis-1,3-Dichloropropene 5.00 4.62 4.52 92.4 90.4 80.0-123 2.19 20 trans-1,3-Dichloropropene 5.00 4.78 4.67 95.6 93.4 78.0-124 2.33 20 trans-1,4-Dichloro-2-butene 5.00 2.61 2.69 52.2 53.8 33.0-144 3.02 20 2,2-Dichloropropane 5.00 4.66 4.38 93.2 87.6 58.0-130 6.19 20 Di-isopropyl ether 5.00 4.63 4.57 92.6 91.4 58.0-138 1.30 20 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 20 of 24 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 20 of 24 QUALITY CONTROL SUMMARYWG2230357 Volatile Organic Compounds (GC/MS) by Method 8260D L1706705-01 Laboratory Control Sample (LCS) • Laboratory Control Sample Duplicate (LCSD) (LCS) R4037005-1 02/22/24 00:34 • (LCSD) R4037005-2 02/22/24 00:54 Spike Amount LCS Result LCSD Result LCS Rec.LCSD Rec.Rec. Limits LCS Qualifier LCSD Qualifier RPD RPD Limits Analyte ug/l ug/l ug/l %%%%% Ethylbenzene 5.00 5.20 5.05 104 101 79.0-123 2.93 20 Hexachloro-1,3-butadiene 5.00 4.56 4.48 91.2 89.6 54.0-138 1.77 20 2-Hexanone 25.0 22.3 23.6 89.2 94.4 67.0-149 5.66 20 n-Hexane 5.00 4.87 4.86 97.4 97.2 57.0-133 0.206 20 Iodomethane 25.0 29.5 27.8 118 111 33.0-147 5.93 26 Isopropylbenzene 5.00 5.17 4.93 103 98.6 76.0-127 4.75 20 p-Isopropyltoluene 5.00 4.45 4.30 89.0 86.0 76.0-125 3.43 20 2-Butanone (MEK)25.0 26.2 26.5 105 106 44.0-160 1.14 20 Methylene Chloride 5.00 5.19 5.06 104 101 67.0-120 2.54 20 4-Methyl-2-pentanone (MIBK)25.0 23.3 24.1 93.2 96.4 68.0-142 3.38 20 Methyl tert-butyl ether 5.00 5.08 5.00 102 100 68.0-125 1.59 20 Naphthalene 5.00 3.17 3.73 63.4 74.6 54.0-135 16.2 20 n-Propylbenzene 5.00 4.33 4.19 86.6 83.8 77.0-124 3.29 20 Styrene 5.00 4.89 4.72 97.8 94.4 73.0-130 3.54 20 1,1,1,2-Tetrachloroethane 5.00 5.45 5.43 109 109 75.0-125 0.368 20 1,1,2,2-Tetrachloroethane 5.00 3.85 3.98 77.0 79.6 65.0-130 3.32 20 1,1,2-Trichlorotrifluoroethane 5.00 5.58 5.45 112 109 69.0-132 2.36 20 Tetrachloroethene 5.00 6.32 6.02 126 120 72.0-132 4.86 20 Toluene 5.00 5.03 4.79 101 95.8 79.0-120 4.89 20 1,2,3-Trichlorobenzene 5.00 3.77 4.33 75.4 86.6 50.0-138 13.8 20 1,2,4-Trichlorobenzene 5.00 4.21 4.39 84.2 87.8 57.0-137 4.19 20 1,1,1-Trichloroethane 5.00 5.83 5.39 117 108 73.0-124 7.84 20 1,1,2-Trichloroethane 5.00 5.02 5.06 100 101 80.0-120 0.794 20 Trichloroethene 5.00 6.27 6.06 125 121 78.0-124 J4 3.41 20 Trichlorofluoromethane 5.00 6.88 6.51 138 130 59.0-147 5.53 20 1,2,3-Trichloropropane 5.00 4.81 5.09 96.2 102 73.0-130 5.66 20 1,2,4-Trimethylbenzene 5.00 4.34 4.27 86.8 85.4 76.0-121 1.63 20 1,2,3-Trimethylbenzene 5.00 4.44 4.47 88.8 89.4 77.0-120 0.673 20 1,3,5-Trimethylbenzene 5.00 4.58 4.41 91.6 88.2 76.0-122 3.78 20 Vinyl acetate 25.0 10.5 11.9 42.0 47.6 11.0-160 12.5 20 Vinyl chloride 5.00 5.47 5.18 109 104 67.0-131 5.45 20 Xylenes, Total 15.0 15.7 14.8 105 98.7 79.0-123 5.90 20 (S) Toluene-d8 104 104 80.0-120 (S) 4-Bromofluorobenzene 99.2 99.5 77.0-126 (S) 1,2-Dichloroethane-d4 115 113 70.0-130 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 21 of 24 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 21 of 24 GLOSSARY OF TERMS Guide to Reading and Understanding Your Laboratory Report The information below is designed to better explain the various terms used in your report of analytical results from the Laboratory. This is not intended as a comprehensive explanation, and if you have additional questions please contact your project representative. Results Disclaimer - Information that may be provided by the customer, and contained within this report, include Permit Limits, Project Name, Sample ID, Sample Matrix, Sample Preservation, Field Blanks, Field Spikes, Field Duplicates, On-Site Data, Sampling Collection Dates/Times, and Sampling Location. Results relate to the accuracy of this information provided, and as the samples are received. Abbreviations and Definitions MDL Method Detection Limit. RDL Reported Detection Limit. Rec.Recovery. RPD Relative Percent Difference. SDG Sample Delivery Group. (S)Surrogate (Surrogate Standard) - Analytes added to every blank, sample, Laboratory Control Sample/Duplicate and Matrix Spike/Duplicate; used to evaluate analytical efficiency by measuring recovery. Surrogates are not expected to be detected in all environmental media. U Not detected at the Reporting Limit (or MDL where applicable). Analyte The name of the particular compound or analysis performed. Some Analyses and Methods will have multiple analytes reported. Dilution If the sample matrix contains an interfering material, the sample preparation volume or weight values differ from the standard, or if concentrations of analytes in the sample are higher than the highest limit of concentration that the laboratory can accurately report, the sample may be diluted for analysis. If a value different than 1 is used in this field, the result reported has already been corrected for this factor. Limits These are the target % recovery ranges or % difference value that the laboratory has historically determined as normal for the method and analyte being reported. Successful QC Sample analysis will target all analytes recovered or duplicated within these ranges. Qualifier This column provides a letter and/or number designation that corresponds to additional information concerning the result reported. If a Qualifier is present, a definition per Qualifier is provided within the Glossary and Definitions page and potentially a discussion of possible implications of the Qualifier in the Case Narrative if applicable. Result The actual analytical final result (corrected for any sample specific characteristics) reported for your sample. If there was no measurable result returned for a specific analyte, the result in this column may state “ND” (Not Detected) or “BDL” (Below Detectable Levels). The information in the results column should always be accompanied by either an MDL (Method Detection Limit) or RDL (Reporting Detection Limit) that defines the lowest value that the laboratory could detect or report for this analyte. Uncertainty (Radiochemistry)Confidence level of 2 sigma. Case Narrative (Cn) A brief discussion about the included sample results, including a discussion of any non-conformances to protocol observed either at sample receipt by the laboratory from the field or during the analytical process. If present, there will be a section in the Case Narrative to discuss the meaning of any data qualifiers used in the report. Quality Control Summary (Qc) This section of the report includes the results of the laboratory quality control analyses required by procedure or analytical methods to assist in evaluating the validity of the results reported for your samples. These analyses are not being performed on your samples typically, but on laboratory generated material. Sample Chain of Custody (Sc) This is the document created in the field when your samples were initially collected. This is used to verify the time and date of collection, the person collecting the samples, and the analyses that the laboratory is requested to perform. This chain of custody also documents all persons (excluding commercial shippers) that have had control or possession of the samples from the time of collection until delivery to the laboratory for analysis. Sample Results (Sr) This section of your report will provide the results of all testing performed on your samples. These results are provided by sample ID and are separated by the analyses performed on each sample. The header line of each analysis section for each sample will provide the name and method number for the analysis reported. Sample Summary (Ss)This section of the Analytical Report defines the specific analyses performed for each sample ID, including the dates and times of preparation and/or analysis. Qualifier Description C3 The reported concentration is an estimate. The continuing calibration standard associated with this data responded low. Method sensitivity check is acceptable. C5 The reported concentration is an estimate. The continuing calibration standard associated with this data responded high. Data is likely to show a high bias concerning the result. J The identification of the analyte is acceptable; the reported value is an estimate. J4 The associated batch QC was outside the established quality control range for accuracy. 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 22 of 24 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 22 of 24 Pace Analytical National 12065 Lebanon Rd Mount Juliet, TN 37122 Alabama 40660 Nebraska NE-OS-15-05 Alaska 17-026 Nevada TN000032021-1 Arizona AZ0612 New Hampshire 2975 Arkansas 88-0469 New Jersey–NELAP TN002 California 2932 New Mexico ¹TN00003 Colorado TN00003 New York 11742 Connecticut PH-0197 North Carolina Env375 Florida E87487 North Carolina ¹DW21704 Georgia NELAP North Carolina ³41 Georgia ¹923 North Dakota R-140 Idaho TN00003 Ohio–VAP CL0069 Illinois 200008 Oklahoma 9915 Indiana C-TN-01 Oregon TN200002 Iowa 364 Pennsylvania 68-02979 Kansas E-10277 Rhode Island LAO00356 Kentucky ¹ ⁶KY90010 South Carolina 84004002 Kentucky ²16 South Dakota n/a Louisiana AI30792 Tennessee ¹ ⁴2006 Louisiana LA018 Texas T104704245-20-18 Maine TN00003 Texas ⁵LAB0152 Maryland 324 Utah TN000032021-11 Massachusetts M-TN003 Vermont VT2006 Michigan 9958 Virginia 110033 Minnesota 047-999-395 Washington C847 Mississippi TN00003 West Virginia 233 Missouri 340 Wisconsin 998093910 Montana CERT0086 Wyoming A2LA A2LA – ISO 17025 1461.01 AIHA-LAP,LLC EMLAP 100789 A2LA – ISO 17025 ⁵1461.02 DOD 1461.01 Canada 1461.01 USDA P330-15-00234 EPA–Crypto TN00003 ACCREDITATIONS & LOCATIONS ¹ Drinking Water ² Underground Storage Tanks ³ Aquatic Toxicity ⁴ Chemical/Microbiological ⁵ Mold ⁶ Wastewater n/a Accreditation not applicable * Not all certifications held by the laboratory are applicable to the results reported in the attached report. * Accreditation is only applicable to the test methods specified on each scope of accreditation held by Pace Analytical. 1 Cp 2Tc 3Ss 4Cn 5Sr 6Qc 7Gl 8Al 9Sc ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:47 23 of 24 ACCOUNT:PROJECT:SDG:DATE/TIME:PAGE: ATC Group Services LLC L1706705 02/22/24 13:59 23 of 24 ATTACHMENT 16 PHOTOGRAPH LOG ATC Group Services LLC 2725 E. Millbrook Road, Suite 121 Raleigh, NC 27604 (919) 871-0999 PHOTOGRAPH LOG PROJECT NO: DC9210SL32 REVIEWED BY: JR SCALE: NTS DATE: 07/2023 PHOTO 1: Site property facing southeast. Southgate Cleaners 1965 Rock Quarry Road Raleigh, Wake County, North Carolina DSCA Site ID DC920047 PHOTO 2: Site property facing northeast. ATC Group Services LLC 2725 E. Millbrook Road, Suite 121 Raleigh, NC 27604 (919) 871-0999 PHOTOGRAPH LOG PROJECT NO: DC9210SL32 REVIEWED BY: JR SCALE: NTS DATE: 07/2023 Southgate Cleaners 1965 Rock Quarry Road Raleigh, Wake County, North Carolina DSCA Site ID DC920047 PHOTO 4: Monitoring well MW-2. PHOTO 3: Monitoring well MW-1. ATC Group Services LLC 2725 E. Millbrook Road, Suite 121 Raleigh, NC 27604 (919) 871-0999 PHOTOGRAPH LOG PROJECT NO: DC9210SL32 REVIEWED BY: JR SCALE: NTS DATE: 07/2023 Southgate Cleaners 1965 Rock Quarry Road Raleigh, Wake County, North Carolina DSCA Site ID DC920047 PHOTO 6: Monitoring well MW-4. PHOTO 5: Monitoring well MW-3. ATC Group Services LLC 2725 E. Millbrook Road, Suite 121 Raleigh, NC 27604 (919) 871-0999 PHOTOGRAPH LOG PROJECT NO: DC9210SL32 REVIEWED BY: JR SCALE: NTS DATE: 07/2023 Southgate Cleaners 1965 Rock Quarry Road Raleigh, Wake County, North Carolina DSCA Site ID DC920047 PHOTO 8: Monitoring well MW-6. PHOTO 7: Monitoring well MW-5. ATC Group Services LLC 2725 E. Millbrook Road, Suite 121 Raleigh, NC 27604 (919) 871-0999 PHOTOGRAPH LOG PROJECT NO: DC9210SL32 REVIEWED BY: JR SCALE: NTS DATE: 07/2023 Southgate Cleaners 1965 Rock Quarry Road Raleigh, Wake County, North Carolina DSCA Site ID DC920047 PHOTO 10: Monitoring well MW-8. PHOTO 9: Monitoring well MW-7.