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Home My WebLink AboutDC320021_20240917_AssessmentLetterReport2725 East Millbrook Road, Suite 121 Raleigh, NC 27604 Tel: 919-871-0999 www.oneatlas.com N.C. Engineering License No. C-1598 NCDEQ DSCA Program September 17, 2024 Ms. Ariana Rivera State of North Carolina Department of Environmental Quality Division of Waste Management, Superfund Section 1646 Mail Service Center Raleigh, North Carolina 27699-1646 RE: Groundwater Assessment Letter Report A Cleaner World #203 5700 Fayetteville Road Durham, Durham County, North Carolina DSCA Site ID DC320021 Dear Ms. Rivera: ATC Associates of North Carolina, P.C. (ATC) has prepared this letter report to document assessment activities conducted at the A Cleaner World #203 site in Durham, Durham County, North Carolina under State-Lead Authorization for Work #010. More specifically, one deep monitoring well was installed on the source property to vertically delineate groundwater impacts. This report includes background information, a description of field activities, and analytical results. 1.0 Background A Cleaner World #203 is located at 5700 Fayetteville Road in Durham, Durham County, North Carolina. Dry-cleaning operations began on November 8, 1995, and continue to present day. Tetrachloroethylene (PCE) has been used since initiation of dry-cleaning activities. Soil and groundwater was found to be impacted by PCE and trichloroethylene (TCE) during due diligence sampling performed on behalf of the owner in 2013. The chlorinated solvent detections were attributed to the dry-cleaning operation; however, the exact cause of the release is unknown. The site was petitioned into the DSCA Program in May 2013. Assessment activities performed under the DSCA Program were initiated in May 2014 by AMEC Environment & Infrastructure, Inc. ATC has performed assessment activities at the site from February 2017 to the present date. Based on the results of assessment activities performed to date, the extent of impacted soil has been adequately delineated and is confined to the source property. Recent assessment activities indicate that the extent of impacted groundwater is adequately defined and stable. Assessment Letter Report September 17, 2024 A Cleaner World #203, DSCA Site ID DC320021 Page 2 NCDEQ DSCA Program 2.0 Monitoring Well Installation and Sampling 2.1 Monitoring Well Installation On September 25 and 26, 2023, ATC supervised SAEDACCO during the installation of one Type II groundwater monitoring well (MW-9). Well MW-9 was installed in the source area on the property to vertically delineate groundwater impacts. Prior to initiating subsurface activities, ATC contacted NC One Call (811) to identify and mark local utilities on the source property. ATC also subcontracted with a private utility location firm to locate other underground utilities not identified by 811. Private utility location was completed September 25, 2023. The well was installed using a hand auger from ground surface to 5 feet below ground surface (bgs) and hollow-stem augers (HSA) from 5 feet bgs to 48 feet bgs. Continuous samples were collected from soil cuttings generated by the augers to a depth of approximately 48 feet bgs to evaluate lithology and general descriptions. During the drilling soils consisted primarily of sandy clay and clay to 8 feet bgs, dark brown silt to 25 feet bgs, partially weathered rock and/or saprolite from 25 to 26 feet bgs, silt to 46 feet bgs, and partially weathered rock to 48 feet bgs. HSA refusal was encountered at 48 feet bgs due to apparent bedrock. Monitoring well MW-9 was installed to a depth of approximately 48 feet bgs and is constructed of 2-inch diameter polyvinyl chloride (PVC) piping with 5 feet of 0.010-inch slotted screen section and 43 feet of solid PVC casing. The boring annulus surrounding the PVC was filled with silica sand from approximately 41 feet to 48 feet bgs, bentonite from approximately 38 feet to 41 feet bgs, and neat cement from the surface to 38 feet bgs. The well was completed within a 2-foot-by- 2-foot concrete pad and 8-inch diameter well vault, affixed well identification tag, and capped with a lockable water-tight cap. Following installation, the well was developed until purge water was free of sediment. Monitoring well construction details are summarized in Table 1. The location of monitoring well MW-9 is shown on Figure 1. Site photographs are included in Appendix A. The boring log and well construction record for MW-9 are included in Appendix B. 2.2 Groundwater Sampling Protocol On September 27, 2023, ATC gauged groundwater levels in all existing monitoring wells associated with the site (MW-1 through MW-9). ATC then collected a groundwater sample from monitoring well MW-9. The sample was collected using low flow sampling methods, and well purging and sampling were completed using a peristaltic pump. Field parameters, including pH, oxidation/reduction potential, specific conductivity, dissolved oxygen, and temperature, were measured every five 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. The groundwater sample was placed in laboratory-supplied containers, entered into chain-of-custody control, placed on ice, and shipped to SGS North America Inc. in Orlando, Florida, for analysis via EPA Method 8260. While on-site for groundwater sampling activities, ATC also surveyed the top-of-casing elevation of MW-9 relative to the existing monitoring well network and collected GPS coordinates of the well. A summary of monitoring well construction details is provided in Table 1 and groundwater Assessment Letter Report September 17, 2024 A Cleaner World #203, DSCA Site ID DC320021 Page 3 NCDEQ DSCA Program elevation data for the site is summarized in Table 2. Natural attenuation parameters are summarized in Table 3. A groundwater elevation contour map is provided as Figure 2. Solid and liquid waste generated during the monitoring well installation and sampling activities was contained in 55-gallon drums. In total, seven 55-gallon drums were generated. ATC oversaw a waste pickup in conjunction with the field work on September 27, 2023. The drums were transported to a designated facility for disposal as hazardous waste. The waste disposal manifest is included as Appendix C. 2.3 Groundwater Analytical Results The results of the groundwater laboratory analysis indicated no constituent concentrations above their respective Title 15A NCAC 2L .0202 Groundwater Standards (2L Standards). Acetone and carbon disulfide were detected above their respective method detection limits, but below their reporting limits. A summary of the laboratory analytical results is presented in Table 4. A map depicting groundwater analytical concentrations is included as Figure 3. The laboratory analytical report and chain-of-custody forms are included in Appendix D. Cross section figures are included in Figures 4A through 4D. Analytical data tables and figures for all historically sampled media for this site is included in Appendix E. 3.0 Quality Assurance / Quality Control ATC conducted a review of the laboratory analytical report included in Appendix D, and no quality assurance or quality control issues were identified. The data are deemed usable for the purposes of the assessment activities and conclusions documented in this submittal. 4.0 Conclusions ATC has completed groundwater assessment activities at the A Cleaner World #203 site in Durham, North Carolina. The results indicate vertical delineation of the groundwater plume. Based ATC recommends completing a Conceptual Site Model to determine data gaps for the site. ATC appreciates the opportunity to assist you with this project. If you have questions or require additional information, please do not hesitate to contact us at (919) 871-0999. Sincerely, ATC Associates of North Carolina, P.C. Jeremy James Robbins, P.G. Ashley M. W. Offer, P.G. Project Manager Program Manager Assessment Letter Report September 17, 2024 A Cleaner World #203, DSCA Site ID DC320021 Page 4 NCDEQ DSCA Program Attachments: Table 1 – Monitoring Well Construction Data Table 2 – Groundwater Elevation Data Table 3 – Analytical Data for Natural Attenuation Parameters Table 4 – Analytical Data for Groundwater Figure 1 – Site Map Figure 2 – Groundwater Elevation Contour Map Figure 3 – Groundwater Analytical Map Figure 4A – Cross Section Transect Map Figure 4B – Cross Section Transect Map with Contours Figure 4C – Cross Section A-A’ Figure 4D – Cross Section B-B’ Appendix A – Photograph Log Appendix B – Boring Log and Well Construction Record Appendix C – Disposal Documentation for Investigative Derived Waste Appendix D – Laboratory Analytical Report Appendix E – Analytical Data Tables and Figures Assessment Letter Report A Cleaner World #203, DSCA Site ID DC320021 NCDEQ DSCA Program TABLES Table 1: Monitoring Well Construction Data DSCA ID No.: DC320021 Well ID Date Installed (mm/dd/yy)Number of Samples Well Depth [feet] Well Diameter [inch] Screen Interval [feet] Status (Active/Inactive) MW-1 06/17/14 5 30 2 15-30 Active MW-2 06/17/14 2 30 2 15-30 Active MW-3 06/17/14 3 33 2 18-33 Active MW-4 06/17/14 2 28 2 13-28 Active MW-5 06/17/14 5 30 2 15-30 Active MW-6 10/02/14 5 27 2 12-27 Active MW-7 02/22/17 4 30 2 15-30 Active MW-8 02/22/17 4 30 2 15-30 Active MW-9 09/26/23 1 48 2 43-48 Active Table 2: Groundwater Elevation Data DSCA ID No.: DC320021 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] 06/26/14 1.87 92.41 ND NA NA 03/01/17 1.70 92.58 ND NA NA 06/01/17 4.65 89.63 ND NA NA 09/27/17 6.30 87.98 ND NA NA 11/10/22 6.43 87.85 ND NA NA 09/27/23 6.16 88.12 ND NA NA 06/26/14 5.59 88.69 ND NA NA 03/01/17 6.57 87.92 ND NA NA 06/01/17 6.67 87.82 ND NA NA 09/27/17 6.98 87.51 ND NA NA 11/10/22 7.89 86.60 ND NA NA 09/27/23 6.90 87.59 ND NA NA 06/26/14 2.73 92.06 ND NA NA 03/01/17 4.27 90.52 ND NA NA 06/01/17 2.74 92.05 ND NA NA 09/27/17 5.31 89.48 ND NA NA 11/10/22 6.98 87.81 ND NA NA 09/27/23 4.07 90.72 ND NA NA 06/26/14 4.76 93.67 ND NA NA 03/01/17 6.39 92.04 ND NA NA 06/01/17 5.22 93.21 ND NA NA 09/27/17 7.75 90.68 ND NA NA 11/10/22 10.03 88.40 ND NA NA 09/27/23 8.64 89.79 ND NA NA 06/26/14 5.34 89.60 ND NA NA 03/01/17 6.26 88.68 ND NA NA 06/01/17 5.20 89.74 ND NA NA 09/27/17 7.13 87.81 ND NA NA 11/10/22 8.13 86.81 ND NA NA 09/27/23 7.44 87.50 ND NA NA 03/01/17 6.84 87.15 ND NA NA 06/01/17 6.85 87.14 ND NA NA 09/27/17 7.40 86.59 ND NA NA 11/10/22 8.14 85.85 ND NA NA 09/27/23 7.90 86.09 ND NA NA 03/01/17 8.35 88.87 ND NA NA 06/01/17 7.22 90.00 ND NA NA 09/27/17 8.06 89.16 ND NA NA 11/10/22 10.26 86.96 ND NA NA 09/27/23 8.54 88.68 ND NA NA 03/01/17 4.94 84.31 ND NA NA 06/01/17 3.75 85.50 ND NA NA 09/28/17 4.36 84.89 ND NA NA 11/10/22 5.61 83.64 ND NA NA 09/27/23 5.59 83.66 ND NA NA MW-9 09/27/23 93.99 9.11 84.88 ND NA NA MW-7 97.22 MW-8 89.25 MW-4 98.43 MW-5 94.94 MW-6 93.99 MW-1 94.28 MW-2 94.49 MW-3 94.79 Table 3: Analytical Data for Natural Attenuation Parameters DSCA ID No.: DC320021 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 ) Sp e c i f i c C o n d u c t i v i t y 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 μs/cm2 std unit ° C mg/L mg/L mg/L 03/01/17 0.44 NA NA NA NA NA 90.7 NA NA NA 552 6.00 19.72 NA NA NA 06/01/17 0.94 NA NA NA NA NA 34.6 NA NA NA 569 6.23 22.28 NA NA NA 09/27/17 0.21 NA NA NA NA NA 103.2 NA NA NA 662 6.08 13.90 NA NA NA 11/10/22 0.93 NA NA NA NA NA 132.2 NA NA 556 507 6.22 20.40 NA NA NA MW-2 09/27/17 0.29 NA NA NA NA NA 89.0 NA NA NA 781 6.58 15.68 NA NA NA 09/27/17 0.57 NA NA NA NA NA 83.3 NA NA NA 548 6.59 15.93 NA NA NA 11/10/22 0.83 NA NA NA NA NA 105.5 NA NA 462 424 6.75 20.72 NA NA NA MW-4 09/27/17 0.20 NA NA NA NA NA 103.2 NA NA NA 954 6.03 15.14 NA NA NA 03/01/17 0.75 NA NA NA NA NA 119.8 NA NA NA 241 5.64 20.96 NA NA NA 06/01/17 0.76 NA NA NA NA NA 37.6 NA NA NA 673 6.47 23.52 NA NA NA 09/27/17 0.75 NA NA NA NA NA 125.9 NA NA NA 338 5.56 15.47 NA NA NA 11/10/22 0.84 NA NA NA NA NA 72.3 NA NA 163 146 5.47 19.58 NA NA NA 03/01/17 0.94 NA NA NA NA NA 92.0 NA NA NA 727 5.91 21.73 NA NA NA 06/01/17 1.45 NA NA NA NA NA 645.0 NA NA NA 754 6.03 25.40 NA NA NA 09/27/17 0.20 NA NA NA NA NA 121.8 NA NA NA 859 5.84 16.02 NA NA NA 11/10/22 0.77 NA NA NA NA NA 168.8 NA NA NA 554 512 21.01 NA NA NA 03/01/17 0.76 NA NA NA NA NA -269.0 NA NA NA 413 6.21 20.45 NA NA NA 06/01/17 1.01 NA NA NA NA NA -72.5 NA NA NA 476 6.69 22.58 NA NA NA 09/27/17 0.15 NA NA NA NA NA -73.1 NA NA NA 553 6.41 22.21 NA NA NA 11/10/22 1.38 NA NA NA NA NA 83.3 NA NA 371 344 5.84 21.12 NA NA NA 03/01/17 5.29 NA NA NA NA NA 48.1 NA NA NA 563 6.91 20.87 NA NA NA 06/01/17 3.33 NA NA NA NA NA 71.6 NA NA NA 718 6.88 24.21 NA NA NA 09/28/17 0.48 NA NA NA NA NA 87.2 NA NA NA 947 6.98 14.21 NA NA NA 11/10/22 0.88 NA NA NA NA NA 90.9 NA NA 590 552 6.84 21.56 NA NA NA MW-9 09/27/23 0.18 NA NA NA NA NA -322.0 NA NA 525 515 7.97 24.0 NA NA NA MW-7 MW-8 Sa m p l e I D MW-1 MW-3 MW-5 MW-6 Table 4: Analytical Data for Groundwater DSCA ID No.: DC320021 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 ) Ac e t o n e Me t h y l E t h y l K e t o n e ( M E K ) 1, 2 , 4 - T r i m e t h y l b e n z e n e Ca r b o n D i s u l f i d e 0.001 0.07 0.6 0.02 0.006 0.0007 0.6 0.1 0.003 0.00003 0.5 6 4 0.4 0.7 TMW-1 06/18/14 <0.00050 <0.00050 <0.00050 <0.00050 <0.0010 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.0015 <0.0050 <0.0050 <0.0050 <0.005 TMW-2 06/18/14 <0.00050 <0.00050 <0.00050 <0.00050 <0.0010 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.0015 0.0051 0.0029J <0.0050 <0.005 06/18/14 0.0011 <0.00050 <0.00050 <0.00050 <0.0010 0.017 <0.00050 <0.00050 0.0015 <0.00050 <0.0015 <0.0050 <0.0050 <0.0050 <0.005 03/01/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 0.00036J <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.0010 <0.0010 <0.004 06/01/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.00050 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 09/27/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 11/10/22 <0.00100 <0.00100 <0.00100 <0.00500 <0.00500 0.000428J <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 <0.0100 <0.0100 <0.00100 <0.00200 06/18/14 <0.00050 <0.00050 <0.00050 <0.00050 <0.0010 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.0015 0.0041J <0.0050 <0.0050 <0.005 09/27/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 06/18/14 <0.00050 <0.00050 <0.00050 <0.00050 <0.0010 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.0015 <0.0050 <0.0050 <0.0050 <0.005 09/27/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 11/10/22*<0.00100 <0.00100 <0.00100 <0.00500 <0.00500 <0.000500 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 <0.0100 <0.0100 <0.00100 <0.00200 06/18/14 <0.00050 <0.00050 <0.00050 <0.00050 <0.0010 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.0015 <0.0050 <0.0050 <0.0050 <0.005 09/27/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 06/18/14 <0.00050 <0.00050 <0.00050 <0.00050 <0.0010 0.0058 <0.00050 <0.00050 <0.00050 <0.00050 <0.0015 <0.0050 <0.0050 <0.0050 <0.005 03/01/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 0.00039J 0.00017J <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.0010 <0.0010 <0.004 06/01/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.00050 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 09/27/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 11/10/22 <0.00100 <0.00100 <0.00100 <0.00500 <0.00500 0.000770 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 <0.0100 <0.0100 <0.00100 <0.00200 10/03/14 <0.00050 <0.00050 <0.00050 <0.00050 <0.0010 0.0031 <0.00050 <0.00050 <0.00050 <0.00050 <0.0015 0.0029J <0.0050 <0.0050 <0.005 03/01/17 <0.0010 <0.0010 <0.0010 0.00051J <0.0020 0.020 0.00024J <0.0010 0.0016 <0.0020 0.00033J <0.050 <0.0010 0.00025J <0.004 06/01/17 <0.0010 <0.0010 <0.0010 0.00045J <0.00050 0.018 <0.001 <0.0010 0.0016 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 09/27/17 <0.0010 <0.0010 <0.0010 0.00097J <0.0020 0.0068 <0.0010 <0.0010 0.0006J <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 11/10/22 <0.00100 <0.00100 <0.00100 0.00182J <0.00500 0.00143 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 <0.0100 <0.0100 <0.00100 <0.00200 03/01/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 <0.00050 0.00019J <0.0010 <0.0010 <0.0020 <0.0030 0.010J <0.0010 <0.0010 <0.004 06/01/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.00050 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 0.0015J 09/27/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 11/10/22 <0.00100 <0.00100 <0.00100 <0.00500 <0.00500 <0.000500 <0.00100 <0.00100 0.000488J <0.00100 <0.00100 <0.0100 <0.0100 <0.00100 <0.00200 03/01/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.0010 <0.0010 <0.004 06/01/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.00050 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 09/28/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 11/10/22 <0.00100 <0.00100 <0.00100 <0.00500 <0.00500 <0.000500 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 <0.0100 <0.0100 <0.00100 <0.00200 MW-9 09/27/23 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00100 0.0051J <0.0025 <0.00050 0.00014J Notes: Bold concentrations exceed 15A NCAC NC 2L .0202 Groundwater Quality Standards (2L Standards). <X: Below laboratory reporting limit of X. J = Estimated value below laboratory reporting limits. mg/L = Milligrams per liter. * = Due to laboratory internal standard failure for the initial in hold analysis, the sample MW-3 was reported from a reanalysis performed outside the method holding time. MW-6 MW-7 MW-8 2L Standards (April 2022) MW-1 MW-2 MW-3 MW-4 MW-5 Gr o u n d w a t e r S a m p l i n g P o i n t Sa m p l i n g D a t e ( m m / d d / y y ) [mg/L] Assessment Letter Report A Cleaner World #203, DSCA Site ID DC320021 NCDEQ DSCA Program FIGURES FAY E T T E V I L L E R O A D MEDICAL OFFICE CENTER ATRIA SOUTHPOINT WALK A CLEANER WORLD #203 MW-1 MW-2 MW-6 MW-5 MW-8 MW-7 MW-3 MW-4 DAVITA HOPE VALLEY DIALYSIS WOOD C R O F T P A R K W A Y 320 330 34 0 34 0 35 0 350 350 350 350 350 360 360 322 324 326 328 33 2 334 33 4 33 6 33 6 33 8 33 8 342 34 2 34 4 34 4 346 346 346 34 6 348 348 348 348 35 2 352 352 35 2 35 4 35 4 35 6 35 6 358 358 NOTE: ALL LOCATIONS ARE APPROXIMATE LEGEND: MONITORING WELL Well Identification DURHAM COUNTY PARCELS SOURCE PROPERTY BOUNDARY MW-1 DURHAM COUNTY TOPOGRAPHY350 N SCALE: 1" = 80' 0 20 40 60 80 MW-9 Figure: 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 \ D A V I D . H U G H E S \ O N E D R I V E - O N E A T L A 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 \ 3 2 - 0 0 2 1 A C L E A N E R W O R L D \ D C 3 2 2 1 S L 1 0 - S I T E . D W G , FI G 1 SI T E M A P 08/21/2024 SE E L O W E R L E F T A C L E A N E R W O R L D # 2 0 3 57 0 0 F A Y E T T E V I L L E R O A D DU R H A M , N O R T H C A R O L I N A DC 3 2 2 1 S L 1 0 AS SHOWN DH BB 1 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 3 2 0 0 2 1 FAY E T T E V I L L E R O A D MEDICAL OFFICE CENTER ATRIA SOUTHPOINT WALK A CLEANER WORLD #203 MW-2 MW-6 MW-5 MW-8 MW-7 MW-3 MW-4 DAVITA HOPE VALLEY DIALYSIS WOOD C R O F T P A R K W A Y 320 330 34 0 34 0 35 0 350 350 350 350 350 360 360 322 324 326 328 33 2 334 33 4 33 6 33 6 33 8 33 8 342 34 2 34 4 34 4 346 346 346 34 6 348 348 348 348 35 2 352 352 35 2 35 4 35 4 35 6 35 6 358 358 NOTE: ALL LOCATIONS ARE APPROXIMATE LEGEND: DURHAM COUNTY PARCELS SOURCE PROPERTY BOUNDARY DURHAM COUNTY TOPOGRAPHY350 N SCALE: 1" = 80' 0 20 40 60 80 MW-9 88.0 GROUNDWATER ELEVATION CONTOUR (DASHED WHERE INFERRED) (ft) GROUNDWATER FLOW DIRECTION MW-7 88.68 MONITORING WELL Well Identification Relative Groundwater Elevation (ft) 90.72 88.12 89.79 87.50 84.88 86.09 88.68 83.66 87.59 MW-1 84 . 0 85 . 0 86 . 0 87 . 0 88 . 0 89 . 0 90.0 Figure: 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 \ D A V I D . H U G H E S \ O N E D R I V E - O N E A T L A 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 \ 3 2 - 0 0 2 1 A C L E A N E R W O R L D \ D C 3 2 2 1 S L 1 0 - P O T . D W G , FI G 2 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 09/06/2024 SE E L O W E R L E F T A C L E A N E R W O R L D # 2 0 3 57 0 0 F A Y E T T E V I L L E R O A D DU R H A M , N O R T H C A R O L I N A DC 3 2 2 1 S L 1 0 AS SHOWN DH BB 2 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. Gr o u n d w a t e r e l e v a t i o n s m e a s u r e d o n S e p t e m b e r 2 7 , 2 0 2 3 . 3. De e p w e l l M W - 9 n o t u s e d i n c o n s t r u c t i o n o f c o n t o u r s . 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 3 2 0 0 2 1 FAY E T T E V I L L E R O A D MEDICAL OFFICE CENTER ATRIA SOUTHPOINT WALK A CLEANER WORLD #203 MW-1 MW-2 MW-6 MW-5 MW-8 MW-7 MW-3 MW-4 DAVITA HOPE VALLEY DIALYSIS WOOD C R O F T P A R K W A Y 320 330 34 0 34 0 35 0 350 350 350 350 350 360 360 322 324 326 328 33 2 334 33 4 33 6 33 6 33 8 33 8 342 34 2 34 4 34 4 346 346 346 34 6 348 348 348 348 35 2 352 352 35 2 35 4 35 4 35 6 35 6 358 358 NOTE: ALL LOCATIONS ARE APPROXIMATE LEGEND: MONITORING WELL Well Identification DURHAM COUNTY PARCELS SOURCE PROPERTY BOUNDARY MW-1 DURHAM COUNTY TOPOGRAPHY350 N SCALE: 1" = 80' 0 20 40 60 80 MW-9 0.0007 0.0007 TETRACHLOROETHYLENE ISOCONCENTRATION CONTOUR (DASHED WHERE INFERRED) (mg/L) Figure: 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 \ D A V I D . H U G H E S \ O N E D R I V E - O N E A T L A 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 \ 3 2 - 0 0 2 1 A C L E A N E R W O R L D \ D C 3 2 2 1 S L 1 0 - G W . D W G , FI G 3 GR O U N D W A T E R A N A L Y T I C A L M A P 09/06/2024 SE E L O W E R L E F T A C L E A N E R W O R L D # 2 0 3 57 0 0 F A Y E T T E V I L L E R O A D DU R H A M , N O R T H C A R O L I N A DC 3 2 2 1 S L 1 0 AS SHOWN DH BB 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 to a s t a t e d a c c u r a c y . 2. Co n c e n t r a t i o n s i n BO L D e x c e e d t h e 2 L S t a n d a r d . 3. Bo x e s s h o w t e t r a c h l o r o e t h y l e n e , p l u s a n y o t h e r c o n s t i t u e n t s d e t e c t e d ab o v e 2 L S t a n d a r d s . 4. Re s u l t s a r e r e p o r t e d i n m i l i l g r a m s p e r l i t e r ( m g / L ) . 5. J = E s t i m a t e d v a l u e . 6. Te t r a c h l o r o e t h y l e n e i s t h e o n l y c o m p o u n d d e t e c t e d a b o v e 2 L S t a n d a r d s . 7. Co n t o u r s a r e b a s e d o n m a x i m u m c o n c e n t r a t i o n s a t a n y d e p t h . 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 3 2 0 0 2 1 FA Y E T T E V I L L E R O A D MEDICAL OFFICE CENTER ATRIA SOUTHPOINT WALK A CLEANER WORLD #203 MW-6 MW-5 MW-8 MW-7 MW-3 MW-4 DAVITA HOPE VALLEY DIALYSIS WOOD C R O F T P A R K W A Y 320 330 34 0 34 0 35 0 350 350 350 350 350 360 360 322 324 326 328 33 2 334 33 4 33 6 33 6 33 8 33 8 34 2 34 2 344 34 4 346 346 346 34 6 348 348 348 34 8 35 2 352 352 352 354 35 4 35 6 35 6 358 358 NOTE: ALL LOCATIONS ARE APPROXIMATE LEGEND: MONITORING WELL Well Identification DURHAM COUNTY PARCELS SOURCE PROPERTY BOUNDARY MW-1 DURHAM COUNTY TOPOGRAPHY350 N SCALE: 1" = 80' 0 20 40 60 80 MW-9 SB-3 SOIL BORING Boring Identification TRANSECT LINE A-A' TRANSECT LINE B-B' SB-12 SB-3 SB-13 SB-10 SB-4 SB-7 SB-6 SB-8 SB-11 SB-5 SB-9 B B' A A' SB-1/MW-2 SB-2/MW-1 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 \ D A V I D . H U G H E S \ O N E D R I V E - O N E A T L A 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 \ 3 2 - 0 0 2 1 A C L E A N E R W O R L D \ D C 3 2 2 1 S L 1 0 - T R A N S E C T . D W G , FI G 4 A CR O S S S E C T I O N T R A N S E C T M A P 09/06/2024 SE E L O W E R L E F T A C L E A N E R W O R L D # 2 0 3 57 0 0 F A Y E T T E V I L L E R O A D DU R H A M , N O R T H C A R O L I N A DC 3 2 2 1 S L 1 0 AS SHOWN DH BB 4A 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 3 2 0 0 2 1 FA Y E T T E V I L L E R O A D MEDICAL OFFICE CENTER ATRIA SOUTHPOINT WALK A CLEANER WORLD #203 MW-6 MW-5 MW-8 MW-7 MW-3 MW-4 DAVITA HOPE VALLEY DIALYSIS WOOD C R O F T P A R K W A Y 320 330 34 0 34 0 35 0 350 350 350 350 350 360 360 322 324 326 328 33 2 334 33 4 33 6 33 6 33 8 33 8 34 2 34 2 344 34 4 346 346 346 34 6 348 348 348 34 8 35 2 352 352 352 354 35 4 35 6 35 6 358 358 NOTE: ALL LOCATIONS ARE APPROXIMATE LEGEND: MONITORING WELL Well Identification DURHAM COUNTY PARCELS SOURCE PROPERTY BOUNDARY MW-1 DURHAM COUNTY TOPOGRAPHY350 N SCALE: 1" = 80' 0 20 40 60 80 MW-9 SB-3 SOIL BORING Boring Identification TRANSECT LINE A-A' TRANSECT LINE B-B' 0.063 TETRACHLOROETHYLENE ISOCONCENTRATION CONTOUR (DASHED WHERE INFERRED) (mg/kg) 0.007 TETRACHLOROETHYLENE ISOCONCENTRATION CONTOUR (DASHED WHERE INFERRED) (mg/L) SB-12 SB-3 SB-13 SB-10 SB-4 SB-7 SB-6 SB-8 SB-11 SB-5 SB-9 B B' A A' 0.0007 SB-1/MW-2 SB-2/MW-10.00630.063 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 \ D A V I D . H U G H E S \ O N E D R I V E - O N E A T L A 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 \ 3 2 - 0 0 2 1 A C L E A N E R W O R L D \ D C 3 2 2 1 S L 1 0 - X S E C . D W G , FI G 4 B CR O S S S E C T I O N T R A N S E C T M A P WI T H C O N T O U R S 09/06/2024 SE E L O W E R L E F T A C L E A N E R W O R L D # 2 0 3 57 0 0 F A Y E T T E V I L L E R O A D DU R H A M , N O R T H C A R O L I N A DC 3 2 2 1 S L 1 0 AS SHOWN DH BB 4B 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 3 2 0 0 2 1 WEST A 100 90 98 . 4 3 89 . 7 9 MW - 4 94 . 9 4 87 . 5 0 MW - 5 93 . 9 9 84 . 8 8 * MW - 9 93 . 9 9 86 . 0 9 MW - 6 89 . 2 5 83 . 6 6 MW - 8 EAST A' 95 85 80 75 70 65 60 55 50 45 40 100 90 95 85 80 75 70 65 60 55 50 45 40 SB - 5 SB - 4 0 0 SCALE HORIZONTAL SCALE 1"= VERTICAL SCALE 1"= 10' 30' 30' 10' WATER TABLE LEGEND: MONITORING WELL Well Identification Top of Casing (TOC) Elevation (ft.) Groundwater Elevation (ft.) Screen End of Boring STATIC WATER LEVEL (09/27/2023) PARTIALLY WEATHERED ROCK SANDY CLAY, CLAY 93.99 87.50 MW-9 SANDY SILT, SILT SILTY SAND, CLAYEY SAND, SAND 0.0007 TETRACHLOROETHYLENE ISOCONCENTRATION CONTOUR (DASHED WHERE INFERRED) (mg/L) 0.0007 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 \ D A V I D . H U G H E S \ O N E D R I V E - O N E A T L A 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 \ 3 2 - 0 0 2 1 A C L E A N E R W O R L D \ D C 3 2 2 1 S L 1 0 - X S E C . D W G , FI G 4 C CR O S S S E C T I O N A - A ' 09/06/2024 SE E L O W E R L E F T A C L E A N E R W O R L D # 2 0 3 57 0 0 F A Y E T T E V I L L E R O A D DU R H A M , N O R T H C A R O L I N A DC 3 2 2 1 S L 1 0 AS SHOWN DH BB 4C 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 sta t e d a c c u r a c y . 2. Gr o u n d w a t e r c o n c e n t r a t i o n s a r e r e p o r t e d i n m i l l i g r a m p e r l i t e r ( m g / L ) . 3. Gr o u n d w a t e r c o n c e n t r a t i o n s i n BO L D r e p r e s e n t e x c e e d a n c e s o f t h e 2 L Sta n d a r d s . 4. So i l c o n c e n t r a t i o n s a r e r e p o r t e d i n m i l l i g r a m p e r k i l o g r a m ( m g / k g ) . 5. So i l c o n c e n t r a t i o n s i n BO L D r e p r e s e n t e x c e e d a n c e s o f t h e I H S B P S R G s . 6. Te t r a c h l o r o e t h y l e n e p l u s c o m p o u n d s e x c e e d i n g t h e 2 L S t a n d a r d s / I H S B P S R G s ar e s h o w n . 7. * = w e l l n o t u s e d t o c o n s t r u c t w a t e r t 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 S i t e I D : DC 3 2 0 0 2 1 NORTH B SOUTH B' 94 . 7 9 90 . 7 2 MW - 3 94 . 4 9 87 . 5 9 MW - 2 / S B - 1 93 . 9 9 86 . 0 9 MW - 6 93 . 9 9 84 . 8 8 * MW - 9 97 . 2 2 88 . 6 8 MW - 7 94 . 9 4 87 . 5 0 MW - 5 100 90 95 85 80 75 70 65 60 55 50 45 40 100 90 95 85 80 75 70 65 60 55 50 45 40 0 0 SCALE HORIZONTAL SCALE 1"= VERTICAL SCALE 1"= 10' 30' 30' 10' WATER TABLE LEGEND: MONITORING WELL Well Identification Top of Casing (TOC) Elevation (ft.) Groundwater Elevation (ft.) Screen End of Boring STATIC WATER LEVEL (09/27/2023) PARTIALLY WEATHERED ROCK SANDY CLAY, CLAY 93.99 87.50 MW-9 SANDY SILT, SILT SILTY SAND, CLAYEY SAND, SAND 0.007 TETRACHLOROETHYLENE ISOCONCENTRATION CONTOUR (DASHED WHERE INFERRED) (mg/L) 0.0007 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 \ D A V I D . H U G H E S \ O N E D R I V E - O N E A T L A 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 \ 3 2 - 0 0 2 1 A C L E A N E R W O R L D \ D C 3 2 2 1 S L 1 0 - X S E C . D W G , FI G 4 D CR O S S S E C T I O N B - B ' 09/06/2024 SE E L O W E R L E F T A C L E A N E R W O R L D # 2 0 3 57 0 0 F A Y E T T E V I L L E R O A D DU R H A M , N O R T H C A R O L I N A DC 3 2 2 1 S L 1 0 AS SHOWN DH BB 4D 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 sta t e d a c c u r a c y . 2. Gr o u n d w a t e r c o n c e n t r a t i o n s a r e r e p o r t e d i n m i l l i g r a m p e r l i t e r ( m g / L ) . 3. Gr o u n d w a t e r c o n c e n t r a t i o n s i n BO L D r e p r e s e n t e x c e e d a n c e s o f t h e 2 L Sta n d a r d s . 4. So i l c o n c e n t r a t i o n s a r e r e p o r t e d i n m i l l i g r a m p e r k i l o g r a m ( m g / k g ) . 5. So i l c o n c e n t r a t i o n s i n BO L D r e p r e s e n t e x c e e d a n c e s o f t h e I H S B P S R G s . 6. Te t r a c h l o r o e t h y l e n e p l u s c o m p o u n d s e x c e e d i n g t h e 2 L S t a n d a r d s / I H S B P S R G s ar e s h o w n . 7. * = w e l l n o t u s e d t o c o n s t r u c t w a t e r t 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 S i t e I D : DC 3 2 0 0 2 1 Assessment Letter Report A Cleaner World #203, DSCA Site ID DC320021 NCDEQ DSCA Program APPENDIX A PHOTOGRAPH LOG ATC Associates of North Carolina, P.C. 2725 E. Millbrook Road, Suite 121 Raleigh, NC 27604 (919) 871-0999 PHOTOGRAPH LOG ATC PROJECT NO: DC3221SL10 REVIEWED BY: JR SCALE: NTS A Cleaner World #203 5700 Fayetteville Road Durham, Durham County, North Carolina DSCA Site ID DC320021 Photograph 1: Front of the A Cleaner World #203 site. Photograph Taken: 09/25/2023 Photograph Taken: 09/25/2023 Photograph 2: Drillers installing monitoring well MW-9. PHOTOGRAPHED BY: AS ATC Associates of North Carolina, P.C. 2725 E. Millbrook Road, Suite 121 Raleigh, NC 27604 (919) 871-0999 PHOTOGRAPH LOG ATC PROJECT NO: DC3221SL10 REVIEWED BY: JR SCALE: NTS Photograph 3: Complete view of monitoring well MW-9. Photograph Taken: 09/25/2023 Photograph Taken: 09/25/2023 Photograph 4: Monitoring well MW-1 PHOTOGRAPHED BY: AS A Cleaner World #203 5700 Fayetteville Road Durham, Durham County, North Carolina DSCA Site ID DC320021 ATC Associates of North Carolina, P.C. 2725 E. Millbrook Road, Suite 121 Raleigh, NC 27604 (919) 871-0999 PHOTOGRAPH LOG ATC PROJECT NO: DC3221SL10 REVIEWED BY: JR SCALE: NTS Photograph 5: Monitoring well MW-2. Photograph Taken: 09/27/2023 Photograph Taken: 09/27/2023 Photograph 6: Monitoring well MW-3. PHOTOGRAPHED BY: AS A Cleaner World #203 5700 Fayetteville Road Durham, Durham County, North Carolina DSCA Site ID DC320021 ATC Associates of North Carolina, P.C. 2725 E. Millbrook Road, Suite 121 Raleigh, NC 27604 (919) 871-0999 PHOTOGRAPHS ATC PROJECT NO: DC3221SL10 REVIEWED BY: JR SCALE: NTS Photograph 7: Monitoring well MW-4. Photograph Taken: 09/27/2023 Photograph Taken: 09/27/2023 Photograph 8: Monitoring Well MW-5. PHOTOGRAPHED BY: AS A Cleaner World #203 5700 Fayetteville Road Durham, Durham County, North Carolina DSCA Site ID DC320021 ATC Associates of North Carolina, P.C. 2725 E. Millbrook Road, Suite 121 Raleigh, NC 27604 (919) 871-0999 PHOTOGRAPH LOG ATC PROJECT NO: DC3221SL10 REVIEWED BY: JR SCALE: NTS Photograph 9: Monitoring Well MW-6. Photograph Taken: 09/27/2023 Photograph Taken: 09/27/2023 Photograph 10: Monitoring Well MW-7. PHOTOGRAPHED BY: AS A Cleaner World #203 5700 Fayetteville Road Durham, Durham County, North Carolina DSCA Site ID DC320021 ATC Associates of North Carolina, P.C. 2725 E. Millbrook Road, Suite 121 Raleigh, NC 27604 (919) 871-0999 PHOTOGRAPH LOG ATC PROJECT NO: DC3221SL10 REVIEWED BY: JR SCALE: NTS Photograph 11: Monitoring Well MW-8. Photograph Taken: 11/10/2022 Photograph Taken: 09/27/2023 Photograph 12: Monitoring Well MW-9. PHOTOGRAPHED BY: AS A Cleaner World #203 5700 Fayetteville Road Durham, Durham County, North Carolina DSCA Site ID DC320021 ATC Associates of North Carolina, P.C. 2725 E. Millbrook Road, Suite 121 Raleigh, NC 27604 (919) 871-0999 PHOTOGRAPH LOG ATC PROJECT NO: DC3221SL10 REVIEWED BY: JR SCALE: NTS Photograph 13: Action shot of monitoring well gauging. Photograph Taken: 09/27/2023 Photograph Taken: 09/27/2023 Photograph 14: Waste storage area, prior to pickup. PHOTOGRAPHED BY: AS A Cleaner World #203 5700 Fayetteville Road Durham, Durham County, North Carolina DSCA Site ID DC320021 Assessment Letter Report A Cleaner World #203, DSCA Site ID DC320021 NCDEQ DSCA Program APPENDIX B BORING LOG AND WELL CONSTRUCTION RECORD MONITORING WELL: MW-9 (Page 1 of 1) Date(s) Drilled : 9/25-26/2023 Drilling Contractor : SAEDACCO Drilling Method : Hand Auger : Hollow Stem Auger Boring Diameter : 8.25 Inches Sampling Method : N/A Sampling Interval : N/A Logged By : Aaron D. Springer De p t h i n F e e t 0 5 10 15 20 25 30 35 40 45 50 US C S GR A P H I C DESCRIPTION Elevation: 93.99 Monitoring Well: MW-9 Grout Bentonite Sand Cover Casing 0.010" Screen Client: NCDEQ- DSCA Contract ATC Project No. DC3221SL10 Durham, Durham County, North Carolina 5700 Fayetteville Road A Cleaner World #203 CL CL CL ML PWR ML PWR Concrete SANDY CLAY, Tan with gray and orange layers, moist CLAY, Dark tan with orange, low plasticity, moist CLAY, Light gray with roots and orange redox mottling, low plasticity, moist SILT, Dark brown/purplish brown, tight, moist; increased moisture content ~12 feet below ground surface Partially Weathered Rock/Saprolite, tight SILT, Dark brown/purplish brown, tight, moist; saturated ~31 feet below ground surface Partially Weathered Rock Refusal - End of boring John Eisenman 4439 SAEDACCO X 9-26-23 MW-9 A Cleaner World #203 5700 Fayetteville Rd., Durham, NC, 27713 Durham X X 1 48 8.25" HSA 0 43 2 SCH-40 PVC 43 48 2 .010 SCH-40 PVC 0 38 Portland Pour 41 48 Sand #2 0 40 clay/sand 40 48 PWR bentonite seal from 38-41' 9/29/2023 Assessment Letter Report A Cleaner World #203, DSCA Site ID DC320021 NCDEQ DSCA Program APPENDIX C DISPOSAL DOCUMENTATION FOR INVESTIGATIVE DERIVED WASTE Assessment Letter Report A Cleaner World #203, DSCA Site ID DC320021 NCDEQ DSCA Program APPENDIX D LABORATORY ANALYTICAL REPORT 10/05/23 Technical Report for ATC Group Services LLC A Cleaner World 203; 5700 Fayetteville Rd, Durham, NC DC3221SL09 SGS Job Number: FC9992 Sampling Date: 09/27/23 Report to: ATC Group Services LLC 2725 Millbrook Rd Suite 121 Raleigh, NC jeremy.robbins@oneatlas.com ATTN: Jeremy Robbins Total number of pages in report: Certifications: FL(E83510), LA(03051), KS(E-10327), NC(573), NJ(FL002), NY(12022), SC(96038001) DoD ELAP(ANAB L2229), AZ(AZ0806), CA(2937), TX(T104704404), PA(68-03573), VA(460177), AL, AK, AR, CT, IA, KY, MA, MI. MS, ND, NH, NV, OK, OR, IL, UT, VT, WA, WI, WV This report shall not be reproduced, except in its entirety, without the written approval of SGS. Test results relate only to samples analyzed. SGS North America Inc. 4405 Vineland Road Suite C-15 Orlando, FL 32811 tel: 407-425-6700 Test results contained within this data package meet the requirements of the National Environmental Laboratory Accreditation Program and/or state specific certification programs as applicable unless noted in the narrative, comments or footnotes. Client Service contact: Muna Mohammed 407-425-6700 Norm Farmer Technical Director Orlando, FL 10/05/23 e-Hardcopy 2.0 Automated Report 21 SGS is the sole authority for authorizing edits or modifications to this document. Unauthorized modification of this report is strictly prohibited. Review standard terms at: http://www.sgs.com/en/terms-and-conditions The results set forth herein are provided by SGS North America Inc. Please share your ideas about how we can serve you better at: EHS.US.CustomerCare@sgs.com 1 of 21 FC9992 Table of Contents -1- Sections: Section 1: Sample Summary ...................................................................................................3 Section 2: Summary of Hits ....................................................................................................4 Section 3: Sample Results ........................................................................................................5 3.1: FC9992-1: MW-9 ..........................................................................................................6 Section 4: Misc. Forms ............................................................................................................9 4.1: Chain of Custody ...........................................................................................................10 Section 5: MS Volatiles - QC Data Summaries .....................................................................12 5.1: Method Blank Summary ................................................................................................13 5.2: Blank Spike Summary ...................................................................................................16 5.3: Matrix Spike/Matrix Spike Duplicate Summary ...........................................................19 1 2 3 4 5 2 of 21 FC9992 SGS North America Inc. Sample Summary ATC Group Services LLC Job No:FC9992 A Cleaner World 203; 5700 Fayetteville Rd, Durham, NC Project No: DC3221SL09 Sample Collected Matrix Client Number Date Time By Received Code Type Sample ID This report contains results reported as ND = Not detected. The following applies: Organics ND = Not detected above the MDL FC9992-1 09/27/23 09:55 NKAS 09/29/23 AQ Ground Water MW-9 3 of 21 FC9992 1 Summary of Hits Page 1 of 1 Job Number:FC9992 Account:ATC Group Services LLC Project:A Cleaner World 203; 5700 Fayetteville Rd, Durham, NC Collected:09/27/23 Lab Sample ID Client Sample ID Result/ Analyte Qual RL MDL Units Method FC9992-1 MW-9 Acetone 0.0051 J 0.010 0.0020 mg/l SW846 8260D Carbon Disulfide 0.00014 J 0.0010 0.00013 mg/l SW846 8260D 4 of 21 FC9992 2 SGS North America Inc. Sample Results Report of Analysis Orlando, FL Section 3 5 of 21 FC9992 3 SGS North America Inc. Report of Analysis Page 1 of 3 Client Sample ID:MW-9 Lab Sample ID:FC9992-1 Date Sampled:09/27/23 Matrix:AQ - Ground Water Date Received:09/29/23 Method:SW846 8260D Percent Solids:n/a Project:A Cleaner World 203; 5700 Fayetteville Rd, Durham, NC File ID DF Analyzed By Prep Date Prep Batch Analytical Batch Run #1 3A3311.D 1 10/02/23 22:29 TD n/a n/a V3A158 Run #2 Purge Volume Run #1 5.0 ml Run #2 VOA 8260 List CAS No.Compound Result RL MDL Units Q 67-64-1 Acetone 0.0051 0.010 0.0020 mg/l J 71-43-2 Benzene a ND 0.00050 0.00013 mg/l 108-86-1 Bromobenzene ND 0.00050 0.00013 mg/l 74-97-5 Bromochloromethane b ND 0.00050 0.00013 mg/l 75-27-4 Bromodichloromethane ND 0.00050 0.00013 mg/l 75-25-2 Bromoform ND 0.00050 0.00013 mg/l 78-93-3 2-Butanone (MEK)ND 0.0025 0.0025 mg/l 104-51-8 n-Butylbenzene ND 0.00050 0.00013 mg/l 135-98-8 sec-Butylbenzene ND 0.00050 0.00013 mg/l 98-06-6 tert-Butylbenzene ND 0.00050 0.00013 mg/l 75-15-0 Carbon Disulfide 0.00014 0.0010 0.00013 mg/l J 56-23-5 Carbon Tetrachloride ND 0.00050 0.00013 mg/l 108-90-7 Chlorobenzene ND 0.00050 0.00013 mg/l 75-00-3 Chloroethane b ND 0.00050 0.00020 mg/l 67-66-3 Chloroform ND 0.00050 0.00013 mg/l 95-49-8 o-Chlorotoluene ND 0.00050 0.00013 mg/l 106-43-4 p-Chlorotoluene ND 0.00050 0.00013 mg/l 124-48-1 Dibromochloromethane ND 0.00050 0.00013 mg/l 96-12-8 1,2-Dibromo-3-chloropropane ND 0.00050 0.00025 mg/l 106-93-4 1,2-Dibromoethane ND 0.00050 0.00013 mg/l 75-71-8 Dichlorodifluoromethane ND 0.00050 0.00020 mg/l 95-50-1 1,2-Dichlorobenzene ND 0.00050 0.00013 mg/l 541-73-1 1,3-Dichlorobenzene ND 0.00050 0.00013 mg/l 106-46-7 1,4-Dichlorobenzene ND 0.00050 0.00013 mg/l 75-34-3 1,1-Dichloroethane ND 0.00050 0.00013 mg/l 107-06-2 1,2-Dichloroethane ND 0.00050 0.00013 mg/l 75-35-4 1,1-Dichloroethylene ND 0.00050 0.00013 mg/l 156-59-2 cis-1,2-Dichloroethylene a ND 0.00050 0.00013 mg/l 156-60-5 trans-1,2-Dichloroethylene ND 0.00050 0.00013 mg/l 78-87-5 1,2-Dichloropropane ND 0.00050 0.00013 mg/l 142-28-9 1,3-Dichloropropane ND 0.00050 0.00013 mg/l 594-20-7 2,2-Dichloropropane ND 0.00050 0.00013 mg/l ND = Not detected MDL = Method Detection Limit J = Indicates an estimated value RL = Reporting Limit B = Indicates analyte found in associated method blank E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound 6 of 21 FC9992 3 3. 1 SGS North America Inc. Report of Analysis Page 2 of 3 Client Sample ID:MW-9 Lab Sample ID:FC9992-1 Date Sampled:09/27/23 Matrix:AQ - Ground Water Date Received:09/29/23 Method:SW846 8260D Percent Solids:n/a Project:A Cleaner World 203; 5700 Fayetteville Rd, Durham, NC VOA 8260 List CAS No.Compound Result RL MDL Units Q 563-58-6 1,1-Dichloropropene ND 0.00050 0.00013 mg/l 10061-01-5 cis-1,3-Dichloropropene ND 0.00050 0.00013 mg/l 10061-02-6 trans-1,3-Dichloropropene ND 0.00050 0.00013 mg/l 100-41-4 Ethylbenzene ND 0.00050 0.00013 mg/l 76-13-1 Freon 113 c ND 0.00050 0.00013 mg/l 87-68-3 Hexachlorobutadiene ND 0.00050 0.00013 mg/l 591-78-6 2-Hexanone ND 0.0050 0.0010 mg/l 98-82-8 Isopropylbenzene ND 0.00050 0.00013 mg/l 99-87-6 p-Isopropyltoluene ND 0.00050 0.00013 mg/l 74-83-9 Methyl Bromide ND 0.00050 0.00020 mg/l 74-87-3 Methyl Chloride b ND 0.00050 0.00020 mg/l 74-95-3 Methylene Bromide ND 0.00050 0.00013 mg/l 75-09-2 Methylene Chloride a ND 0.0020 0.0010 mg/l 108-10-1 4-Methyl-2-pentanone (MIBK)ND 0.0025 0.0013 mg/l 1634-04-4 Methyl Tert Butyl Ether a ND 0.00050 0.00013 mg/l 91-20-3 Naphthalene ND 0.00050 0.00013 mg/l 103-65-1 n-Propylbenzene ND 0.00050 0.00013 mg/l 100-42-5 Styrene ND 0.00050 0.00013 mg/l 630-20-6 1,1,1,2-Tetrachloroethane ND 0.00050 0.00013 mg/l 79-34-5 1,1,2,2-Tetrachloroethane ND 0.00050 0.00013 mg/l 127-18-4 Tetrachloroethylene ND 0.00050 0.00013 mg/l 108-88-3 Toluene ND 0.00050 0.00013 mg/l 87-61-6 1,2,3-Trichlorobenzene ND 0.00050 0.00013 mg/l 120-82-1 1,2,4-Trichlorobenzene ND 0.00050 0.00013 mg/l 71-55-6 1,1,1-Trichloroethane ND 0.00050 0.00013 mg/l 79-00-5 1,1,2-Trichloroethane ND 0.00050 0.00013 mg/l 79-01-6 Trichloroethylene ND 0.00050 0.00013 mg/l 75-69-4 Trichlorofluoromethane ND 0.00050 0.00020 mg/l 96-18-4 1,2,3-Trichloropropane ND 0.00050 0.00013 mg/l 95-63-6 1,2,4-Trimethylbenzene ND 0.00050 0.00013 mg/l 108-67-8 1,3,5-Trimethylbenzene ND 0.00050 0.00013 mg/l 108-05-4 Vinyl Acetate ND 0.0050 0.0010 mg/l 75-01-4 Vinyl Chloride b ND 0.00050 0.00013 mg/l m,p-Xylene ND 0.0010 0.00013 mg/l 95-47-6 o-Xylene ND 0.00050 0.00013 mg/l CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits 1868-53-7 Dibromofluoromethane 102%83-118% 17060-07-0 1,2-Dichloroethane-D4 104%79-125% ND = Not detected MDL = Method Detection Limit J = Indicates an estimated value RL = Reporting Limit B = Indicates analyte found in associated method blank E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound 7 of 21 FC9992 3 3. 1 SGS North America Inc. Report of Analysis Page 3 of 3 Client Sample ID:MW-9 Lab Sample ID:FC9992-1 Date Sampled:09/27/23 Matrix:AQ - Ground Water Date Received:09/29/23 Method:SW846 8260D Percent Solids:n/a Project:A Cleaner World 203; 5700 Fayetteville Rd, Durham, NC VOA 8260 List CAS No.Surrogate Recoveries Run# 1 Run# 2 Limits 2037-26-5 Toluene-D8 96%85-112% 460-00-4 4-Bromofluorobenzene 98%83-118% (a) Associated BS recovery outside control limits high, sample is ND. (b) Associated CCV outside of control limits high, sample was ND. (c) Associated CCV and BS outside control limits high, sample is ND. ND = Not detected MDL = Method Detection Limit J = Indicates an estimated value RL = Reporting Limit B = Indicates analyte found in associated method blank E = Indicates value exceeds calibration range N = Indicates presumptive evidence of a compound 8 of 21 FC9992 3 3. 1 SGS North America Inc. Misc. Forms Custody Documents and Other Forms Includes the following where applicable: Chain of Custody Orlando, FL Section 4 9 of 21 FC9992 4 FC9992: Chain of Custody Page 1 of 2 10 of 21 FC9992 4 4. 1 Job Number:fc9992 Client:ATC Date / Time Received:9/29/2023 9:45:00 AM Delivery Method:FED EX Project:A CLEANER WORLD 203 Airbill #'s:7043 0338 7583 Cooler Information 1. Custody Seals Present: Y or N 2. Custody Seals Intact: 4. Cooler temp verification: 3. Temp criteria achieved: 5. Cooler media: IR Gun Ice (Bag) Trip Blank Information Y or N N/A 1. Trip Blank present / cooler: 2. Trip Blank listed on COC: Sample Information 1. Sample labels present on bottles: 2. Samples presented properly 3. Suffiient volume/containers recv'd for analysis 4. Condition of sample: 5. Sample recv'd within HT 6. Dates/Times/IDs on COC match sample label 7. VOCs have headspace 8. Bottles received for unspecified tests 9. Compositing instructions clear 10. Voa Soil Kits/Jars received past 48hrs? Intact Comments Cooler Temps (Raw Measured) °C: Cooler Temps (Corrected) °C: Cooler 1: (1.4); Cooler 1: (1.6); SM001Rev. Date 05/04/17 SGS Sample Receipt Summary Test Strip Lot #s:pH 0-3:pH 10-12:Other: (Specify) 3. Type of TB Received W or S N/A Y or N N/A 11. % Solids Jar Received? 12. Residual Chlorine Present? Misc Information Number of Encores:25 Gram 5 Gram Residual Chlorine Test Strip Lot # Number of Lab Filtered Metals: Technician:SHAYLAP Date:9/29/2023 10:01:43 AM Reviewer:Date: FC9992: Chain of Custody Page 2 of 2 11 of 21 FC9992 4 4. 1 SGS North America Inc. MS Volatiles QC Data Summaries Includes the following where applicable: Method Blank Summaries Blank Spike Summaries Matrix Spike and Duplicate Summaries Orlando, FL Section 5 12 of 21 FC9992 5 Method Blank Summary Page 1 of 3 Job Number:FC9992 Account:ATCNCR ATC Group Services LLC Project:A Cleaner World 203; 5700 Fayetteville Rd, Durham, NC Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch V3A158-MB 3A3310.D 1 10/02/23 TD n/a n/a V3A158 The QC reported here applies to the following samples:Method: SW846 8260D FC9992-1 CAS No.Compound Result RL MDL Units Q 67-64-1 Acetone ND 10 2.0 ug/l 71-43-2 Benzene ND 0.50 0.13 ug/l 108-86-1 Bromobenzene ND 0.50 0.13 ug/l 74-97-5 Bromochloromethane ND 0.50 0.13 ug/l 75-27-4 Bromodichloromethane ND 0.50 0.13 ug/l 75-25-2 Bromoform ND 0.50 0.13 ug/l 78-93-3 2-Butanone (MEK)ND 2.5 2.5 ug/l 104-51-8 n-Butylbenzene ND 0.50 0.13 ug/l 135-98-8 sec-Butylbenzene ND 0.50 0.13 ug/l 98-06-6 tert-Butylbenzene ND 0.50 0.13 ug/l 75-15-0 Carbon Disulfide ND 1.0 0.13 ug/l 56-23-5 Carbon Tetrachloride ND 0.50 0.13 ug/l 108-90-7 Chlorobenzene ND 0.50 0.13 ug/l 75-00-3 Chloroethane ND 0.50 0.20 ug/l 67-66-3 Chloroform ND 0.50 0.13 ug/l 95-49-8 o-Chlorotoluene ND 0.50 0.13 ug/l 106-43-4 p-Chlorotoluene ND 0.50 0.13 ug/l 124-48-1 Dibromochloromethane ND 0.50 0.13 ug/l 96-12-8 1,2-Dibromo-3-chloropropane ND 0.50 0.25 ug/l 106-93-4 1,2-Dibromoethane ND 0.50 0.13 ug/l 75-71-8 Dichlorodifluoromethane ND 0.50 0.20 ug/l 95-50-1 1,2-Dichlorobenzene ND 0.50 0.13 ug/l 541-73-1 1,3-Dichlorobenzene ND 0.50 0.13 ug/l 106-46-7 1,4-Dichlorobenzene ND 0.50 0.13 ug/l 75-34-3 1,1-Dichloroethane ND 0.50 0.13 ug/l 107-06-2 1,2-Dichloroethane ND 0.50 0.13 ug/l 75-35-4 1,1-Dichloroethylene ND 0.50 0.13 ug/l 156-59-2 cis-1,2-Dichloroethylene ND 0.50 0.13 ug/l 156-60-5 trans-1,2-Dichloroethylene ND 0.50 0.13 ug/l 78-87-5 1,2-Dichloropropane ND 0.50 0.13 ug/l 142-28-9 1,3-Dichloropropane ND 0.50 0.13 ug/l 594-20-7 2,2-Dichloropropane ND 0.50 0.13 ug/l 563-58-6 1,1-Dichloropropene ND 0.50 0.13 ug/l 10061-01-5 cis-1,3-Dichloropropene ND 0.50 0.13 ug/l 10061-02-6 trans-1,3-Dichloropropene ND 0.50 0.13 ug/l 100-41-4 Ethylbenzene ND 0.50 0.13 ug/l 13 of 21 FC9992 5 5. 1 . 1 Method Blank Summary Page 2 of 3 Job Number:FC9992 Account:ATCNCR ATC Group Services LLC Project:A Cleaner World 203; 5700 Fayetteville Rd, Durham, NC Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch V3A158-MB 3A3310.D 1 10/02/23 TD n/a n/a V3A158 The QC reported here applies to the following samples:Method: SW846 8260D FC9992-1 CAS No.Compound Result RL MDL Units Q 76-13-1 Freon 113 ND 0.50 0.13 ug/l 87-68-3 Hexachlorobutadiene ND 0.50 0.13 ug/l 591-78-6 2-Hexanone ND 5.0 1.0 ug/l 98-82-8 Isopropylbenzene ND 0.50 0.13 ug/l 99-87-6 p-Isopropyltoluene ND 0.50 0.13 ug/l 74-83-9 Methyl Bromide 0.66 0.50 0.20 ug/l 74-87-3 Methyl Chloride ND 0.50 0.20 ug/l 74-95-3 Methylene Bromide ND 0.50 0.13 ug/l 75-09-2 Methylene Chloride 1.0 2.0 1.0 ug/l J 108-10-1 4-Methyl-2-pentanone (MIBK)ND 2.5 1.3 ug/l 1634-04-4 Methyl Tert Butyl Ether ND 0.50 0.13 ug/l 91-20-3 Naphthalene ND 0.50 0.13 ug/l 103-65-1 n-Propylbenzene ND 0.50 0.13 ug/l 100-42-5 Styrene ND 0.50 0.13 ug/l 630-20-6 1,1,1,2-Tetrachloroethane ND 0.50 0.13 ug/l 79-34-5 1,1,2,2-Tetrachloroethane ND 0.50 0.13 ug/l 127-18-4 Tetrachloroethylene ND 0.50 0.13 ug/l 108-88-3 Toluene ND 0.50 0.13 ug/l 87-61-6 1,2,3-Trichlorobenzene ND 0.50 0.13 ug/l 120-82-1 1,2,4-Trichlorobenzene ND 0.50 0.13 ug/l 71-55-6 1,1,1-Trichloroethane ND 0.50 0.13 ug/l 79-00-5 1,1,2-Trichloroethane ND 0.50 0.13 ug/l 79-01-6 Trichloroethylene ND 0.50 0.13 ug/l 75-69-4 Trichlorofluoromethane ND 0.50 0.20 ug/l 96-18-4 1,2,3-Trichloropropane ND 0.50 0.13 ug/l 95-63-6 1,2,4-Trimethylbenzene ND 0.50 0.13 ug/l 108-67-8 1,3,5-Trimethylbenzene ND 0.50 0.13 ug/l 108-05-4 Vinyl Acetate ND 5.0 1.0 ug/l 75-01-4 Vinyl Chloride ND 0.50 0.13 ug/l m,p-Xylene ND 1.0 0.13 ug/l 95-47-6 o-Xylene ND 0.50 0.13 ug/l CAS No.Surrogate Recoveries Limits 1868-53-7 Dibromofluoromethane 100%83-118% 14 of 21 FC9992 5 5. 1 . 1 Method Blank Summary Page 3 of 3 Job Number:FC9992 Account:ATCNCR ATC Group Services LLC Project:A Cleaner World 203; 5700 Fayetteville Rd, Durham, NC Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch V3A158-MB 3A3310.D 1 10/02/23 TD n/a n/a V3A158 The QC reported here applies to the following samples:Method: SW846 8260D FC9992-1 CAS No.Surrogate Recoveries Limits 17060-07-0 1,2-Dichloroethane-D4 101%79-125% 2037-26-5 Toluene-D8 98%85-112% 460-00-4 4-Bromofluorobenzene 99%83-118% 15 of 21 FC9992 5 5. 1 . 1 Blank Spike Summary Page 1 of 3 Job Number:FC9992 Account:ATCNCR ATC Group Services LLC Project:A Cleaner World 203; 5700 Fayetteville Rd, Durham, NC Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch V3A158-BS 3A3308.D 1 10/02/23 TD n/a n/a V3A158 The QC reported here applies to the following samples:Method: SW846 8260D FC9992-1 Spike BSP BSP CAS No.Compound ug/l ug/l %Limits 67-64-1 Acetone 50 66.9 134 50-147 71-43-2 Benzene 10 12.9 129*81-122 108-86-1 Bromobenzene 10 10.4 104 80-121 74-97-5 Bromochloromethane 10 13.3 133*76-123 75-27-4 Bromodichloromethane 10 10 100 79-123 75-25-2 Bromoform 10 8.5 85 66-123 78-93-3 2-Butanone (MEK)50 71.2 142 56-143 104-51-8 n-Butylbenzene 10 8.7 87 79-126 135-98-8 sec-Butylbenzene 10 9.0 90 83-133 98-06-6 tert-Butylbenzene 10 9.3 93 80-133 75-15-0 Carbon Disulfide 10 13.4 134 66-148 56-23-5 Carbon Tetrachloride 10 9.4 94 76-136 108-90-7 Chlorobenzene 10 10.0 100 82-124 75-00-3 Chloroethane 10 9.9 99 62-144 67-66-3 Chloroform 10 12.2 122 80-124 95-49-8 o-Chlorotoluene 10 9.7 97 81-127 106-43-4 p-Chlorotoluene 10 9.7 97 83-130 124-48-1 Dibromochloromethane 10 9.4 94 78-122 96-12-8 1,2-Dibromo-3-chloropropane 10 9.4 94 64-123 106-93-4 1,2-Dibromoethane 10 10.6 106 75-120 75-71-8 Dichlorodifluoromethane 10 12.9 129 42-167 95-50-1 1,2-Dichlorobenzene 10 10.1 101 82-124 541-73-1 1,3-Dichlorobenzene 10 9.6 96 84-125 106-46-7 1,4-Dichlorobenzene 10 9.9 99 78-120 75-34-3 1,1-Dichloroethane 10 11.9 119 81-122 107-06-2 1,2-Dichloroethane 10 11.8 118 75-125 75-35-4 1,1-Dichloroethylene 10 11.9 119 78-137 156-59-2 cis-1,2-Dichloroethylene 10 12.6 126*78-120 156-60-5 trans-1,2-Dichloroethylene 10 12.1 121 76-127 78-87-5 1,2-Dichloropropane 10 10.7 107 76-124 142-28-9 1,3-Dichloropropane 10 11.3 113 80-118 594-20-7 2,2-Dichloropropane 10 10.2 102 74-139 563-58-6 1,1-Dichloropropene 10 12.3 123 79-131 10061-01-5 cis-1,3-Dichloropropene 10 9.7 97 75-118 10061-02-6 trans-1,3-Dichloropropene 10 8.7 87 80-120 100-41-4 Ethylbenzene 10 9.7 97 81-121 * = Outside of Control Limits. 16 of 21 FC9992 5 5. 2 . 1 Blank Spike Summary Page 2 of 3 Job Number:FC9992 Account:ATCNCR ATC Group Services LLC Project:A Cleaner World 203; 5700 Fayetteville Rd, Durham, NC Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch V3A158-BS 3A3308.D 1 10/02/23 TD n/a n/a V3A158 The QC reported here applies to the following samples:Method: SW846 8260D FC9992-1 Spike BSP BSP CAS No.Compound ug/l ug/l %Limits 76-13-1 Freon 113 10 15.0 150*72-134 87-68-3 Hexachlorobutadiene 10 9.5 95 75-142 591-78-6 2-Hexanone 50 50.6 101 61-129 98-82-8 Isopropylbenzene 10 9.7 97 83-132 99-87-6 p-Isopropyltoluene 10 9.3 93 79-130 74-83-9 Methyl Bromide 10 13.0 130 59-143 74-87-3 Methyl Chloride 10 11.6 116 50-159 74-95-3 Methylene Bromide 10 10.7 107 78-119 75-09-2 Methylene Chloride 10 13.7 137*69-135 108-10-1 4-Methyl-2-pentanone (MIBK)50 54.5 109 66-122 1634-04-4 Methyl Tert Butyl Ether 10 13.8 138*72-117 91-20-3 Naphthalene 10 9.9 99 63-132 103-65-1 n-Propylbenzene 10 9.3 93 82-133 100-42-5 Styrene 10 9.6 96 78-119 630-20-6 1,1,1,2-Tetrachloroethane 10 9.0 90 77-122 79-34-5 1,1,2,2-Tetrachloroethane 10 10.2 102 72-120 127-18-4 Tetrachloroethylene 10 10.0 100 76-135 108-88-3 Toluene 10 10.1 101 80-120 87-61-6 1,2,3-Trichlorobenzene 10 10.5 105 68-131 120-82-1 1,2,4-Trichlorobenzene 10 10 100 73-129 71-55-6 1,1,1-Trichloroethane 10 11.1 111 75-130 79-00-5 1,1,2-Trichloroethane 10 10.5 105 76-119 79-01-6 Trichloroethylene 10 10.4 104 81-126 75-69-4 Trichlorofluoromethane 10 9.6 96 71-156 96-18-4 1,2,3-Trichloropropane 10 10.9 109 77-120 95-63-6 1,2,4-Trimethylbenzene 10 9.9 99 79-120 108-67-8 1,3,5-Trimethylbenzene 10 9.8 98 79-120 108-05-4 Vinyl Acetate 50 56.2 112 43-154 75-01-4 Vinyl Chloride 10 11.9 119 69-159 m,p-Xylene 20 19.9 100 79-126 95-47-6 o-Xylene 10 9.9 99 80-127 CAS No.Surrogate Recoveries BSP Limits 1868-53-7 Dibromofluoromethane 117%83-118% * = Outside of Control Limits. 17 of 21 FC9992 5 5. 2 . 1 Blank Spike Summary Page 3 of 3 Job Number:FC9992 Account:ATCNCR ATC Group Services LLC Project:A Cleaner World 203; 5700 Fayetteville Rd, Durham, NC Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch V3A158-BS 3A3308.D 1 10/02/23 TD n/a n/a V3A158 The QC reported here applies to the following samples:Method: SW846 8260D FC9992-1 CAS No.Surrogate Recoveries BSP Limits 17060-07-0 1,2-Dichloroethane-D4 111%79-125% 2037-26-5 Toluene-D8 97%85-112% 460-00-4 4-Bromofluorobenzene 98%83-118% * = Outside of Control Limits. 18 of 21 FC9992 5 5. 2 . 1 Matrix Spike/Matrix Spike Duplicate Summary Page 1 of 3 Job Number:FC9992 Account:ATCNCR ATC Group Services LLC Project:A Cleaner World 203; 5700 Fayetteville Rd, Durham, NC Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch FC9992-1MS 3A3314.D 5 10/02/23 TD n/a n/a V3A158 FC9992-1MSD 3A3315.D 5 10/03/23 TD n/a n/a V3A158 FC9992-1 3A3311.D 1 10/02/23 TD n/a n/a V3A158 The QC reported here applies to the following samples:Method: SW846 8260D FC9992-1 FC9992-1 Spike MS MS Spike MSD MSD Limits CAS No.Compound ug/l Q ug/l ug/l %ug/l ug/l %RPD Rec/RPD 67-64-1 Acetone 5.1 J 250 230 90 250 221 86 4 50-147/21 71-43-2 Benzene ND 50 61.3 123*50 58.6 117 5 81-122/14 108-86-1 Bromobenzene ND 50 70.9 142*50 47.5 95 40*80-121/14 74-97-5 Bromochloromethane ND 50 63.2 126*50 57.9 116 9 76-123/14 75-27-4 Bromodichloromethane ND 50 56.8 114 50 53.7 107 6 79-123/19 75-25-2 Bromoform ND 50 42.1 84 50 42.1 84 0 66-123/21 78-93-3 2-Butanone (MEK)1.5 250 250 99 250 246 98 2 56-143/18 104-51-8 n-Butylbenzene ND 50 51.1 102 50 53.7 107 5 79-126/16 135-98-8 sec-Butylbenzene ND 50 64.8 130 50 46.1 92 34*83-133/16 98-06-6 tert-Butylbenzene ND 50 65.8 132 50 46.9 94 34*80-133/16 75-15-0 Carbon Disulfide 0.14 J 50 65.3 130 50 63.0 126 4 66-148/23 56-23-5 Carbon Tetrachloride ND 50 55.0 110 50 52.8 106 4 76-136/23 108-90-7 Chlorobenzene ND 50 57.0 114 50 53.8 108 6 82-124/14 75-00-3 Chloroethane ND 50 69.9 140 50 71.8 144 3 62-144/20 67-66-3 Chloroform ND 50 63.1 126*50 60.0 120 5 80-124/15 95-49-8 o-Chlorotoluene ND 50 69.2 138*50 47.1 94 38*81-127/15 106-43-4 p-Chlorotoluene ND 50 67.4 135*50 46.8 94 36*83-130/15 124-48-1 Dibromochloromethane ND 50 46.4 93 50 48.4 97 4 78-122/19 96-12-8 1,2-Dibromo-3-chloropropane ND 50 48.8 98 50 39.6 79 21*64-123/18 106-93-4 1,2-Dibromoethane ND 50 55.9 112 50 53.9 108 4 75-120/13 75-71-8 Dichlorodifluoromethane ND 50 93.7 187*50 88.1 176*6 42-167/19 95-50-1 1,2-Dichlorobenzene ND 50 55.5 111 50 56.9 114 2 82-124/14 541-73-1 1,3-Dichlorobenzene ND 50 55.3 111 50 51.4 103 7 84-125/14 106-46-7 1,4-Dichlorobenzene ND 50 53.9 108 50 55.5 111 3 78-120/15 75-34-3 1,1-Dichloroethane ND 50 57.8 116 50 56.5 113 2 81-122/15 107-06-2 1,2-Dichloroethane ND 50 60.5 121 50 55.8 112 8 75-125/14 75-35-4 1,1-Dichloroethylene ND 50 63.5 127 50 64.1 128 1 78-137/18 156-59-2 cis-1,2-Dichloroethylene ND 50 60.8 122*50 56.0 112 8 78-120/15 156-60-5 trans-1,2-Dichloroethylene ND 50 60.3 121 50 58.6 117 3 76-127/17 78-87-5 1,2-Dichloropropane ND 50 61.4 123 50 58.6 117 5 76-124/14 142-28-9 1,3-Dichloropropane ND 50 61.0 122*50 56.9 114 7 80-118/13 594-20-7 2,2-Dichloropropane ND 50 55.8 112 50 52.3 105 6 74-139/17 563-58-6 1,1-Dichloropropene ND 50 65.9 132*50 62.8 126 5 79-131/16 10061-01-5 cis-1,3-Dichloropropene ND 50 60.8 122*50 49.9 100 20 75-118/23 10061-02-6 trans-1,3-Dichloropropene ND 50 45.0 90 50 44.5 89 1 80-120/22 100-41-4 Ethylbenzene ND 50 56.7 113 50 54.9 110 3 81-121/14 * = Outside of Control Limits. 19 of 21 FC9992 5 5. 3 . 1 Matrix Spike/Matrix Spike Duplicate Summary Page 2 of 3 Job Number:FC9992 Account:ATCNCR ATC Group Services LLC Project:A Cleaner World 203; 5700 Fayetteville Rd, Durham, NC Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch FC9992-1MS 3A3314.D 5 10/02/23 TD n/a n/a V3A158 FC9992-1MSD 3A3315.D 5 10/03/23 TD n/a n/a V3A158 FC9992-1 3A3311.D 1 10/02/23 TD n/a n/a V3A158 The QC reported here applies to the following samples:Method: SW846 8260D FC9992-1 FC9992-1 Spike MS MS Spike MSD MSD Limits CAS No.Compound ug/l Q ug/l ug/l %ug/l ug/l %RPD Rec/RPD 76-13-1 Freon 113 ND 50 81.6 163*50 77.2 154*6 72-134/20 87-68-3 Hexachlorobutadiene ND 50 58.9 118 50 49.3 99 18 75-142/19 591-78-6 2-Hexanone ND 250 251 100 250 229 92 9 61-129/18 98-82-8 Isopropylbenzene ND 50 56.4 113 50 54.9 110 3 83-132/15 99-87-6 p-Isopropyltoluene ND 50 65.5 131*50 47.0 94 33*79-130/16 74-83-9 Methyl Bromide ND 50 78.3 157*50 78.7 157*1 59-143/19 74-87-3 Methyl Chloride ND 50 75.3 151 50 73.1 146 3 50-159/19 74-95-3 Methylene Bromide ND 50 58.1 116 50 56.4 113 3 78-119/14 75-09-2 Methylene Chloride ND 50 62.5 125 50 60.7 121 3 69-135/16 108-10-1 4-Methyl-2-pentanone (MIBK)ND 250 279 112 250 254 102 9 66-122/16 1634-04-4 Methyl Tert Butyl Ether ND 50 62.6 125*50 60.2 120*4 72-117/14 91-20-3 Naphthalene ND 50 50.2 100 50 41.9 84 18 63-132/25 103-65-1 n-Propylbenzene ND 50 69.7 139*50 47.4 95 38*82-133/15 100-42-5 Styrene ND 50 52.8 106 50 50.4 101 5 78-119/23 630-20-6 1,1,1,2-Tetrachloroethane ND 50 48.0 96 50 47.8 96 0 77-122/19 79-34-5 1,1,2,2-Tetrachloroethane ND 50 71.4 143*50 45.4 91 45*72-120/14 127-18-4 Tetrachloroethylene ND 50 59.0 118 50 58.0 116 2 76-135/16 108-88-3 Toluene ND 50 59.2 118 50 55.9 112 6 80-120/14 87-61-6 1,2,3-Trichlorobenzene ND 50 57.4 115 50 47.3 95 19 68-131/25 120-82-1 1,2,4-Trichlorobenzene ND 50 55.2 110 50 46.4 93 17 73-129/20 71-55-6 1,1,1-Trichloroethane ND 50 64.7 129 50 60.6 121 7 75-130/16 79-00-5 1,1,2-Trichloroethane ND 50 57.9 116 50 53.7 107 8 76-119/14 79-01-6 Trichloroethylene ND 50 61.2 122 50 57.9 116 6 81-126/15 75-69-4 Trichlorofluoromethane ND 50 61.3 123 50 69.4 139 12 71-156/21 96-18-4 1,2,3-Trichloropropane ND 50 69.5 139*50 49.7 99 33*77-120/16 95-63-6 1,2,4-Trimethylbenzene ND 50 68.4 137*50 47.6 95 36*79-120/18 108-67-8 1,3,5-Trimethylbenzene ND 50 70.8 142*50 49.0 98 36*79-120/19 108-05-4 Vinyl Acetate ND 250 253 101 250 251 100 1 43-154/14 75-01-4 Vinyl Chloride ND 50 92.0 184*50 83.8 168*9 69-159/18 m,p-Xylene ND 100 115 115 100 113 113 2 79-126/15 95-47-6 o-Xylene ND 50 55.9 112 50 54.6 109 2 80-127/14 CAS No.Surrogate Recoveries MS MSD FC9992-1 Limits 1868-53-7 Dibromofluoromethane 103%102%102%83-118% * = Outside of Control Limits. 20 of 21 FC9992 5 5. 3 . 1 Matrix Spike/Matrix Spike Duplicate Summary Page 3 of 3 Job Number:FC9992 Account:ATCNCR ATC Group Services LLC Project:A Cleaner World 203; 5700 Fayetteville Rd, Durham, NC Sample File ID DF Analyzed By Prep Date Prep Batch Analytical Batch FC9992-1MS 3A3314.D 5 10/02/23 TD n/a n/a V3A158 FC9992-1MSD 3A3315.D 5 10/03/23 TD n/a n/a V3A158 FC9992-1 3A3311.D 1 10/02/23 TD n/a n/a V3A158 The QC reported here applies to the following samples:Method: SW846 8260D FC9992-1 CAS No.Surrogate Recoveries MS MSD FC9992-1 Limits 17060-07-0 1,2-Dichloroethane-D4 103%102%104%79-125% 2037-26-5 Toluene-D8 98%96%96%85-112% 460-00-4 4-Bromofluorobenzene 122%*86%98%83-118% * = Outside of Control Limits. 21 of 21 FC9992 5 5. 3 . 1 Assessment Letter Report A Cleaner World #203, DSCA Site ID DC320021 NCDEQ DSCA Program APPENDIX E ANALYTICAL DATA TABLES AND FIGURES DSCA ID No.: Submittal Date: Analytical Data Tables for North Carolina Dry-Cleaning Solvent Cleanup Act Program Prepared By: Facility Name:A Cleaner World #203 5700 Fayetteville Road, Durham, Durham County, North Carolina 2725 East Millbrook Road, Suite 121, Raleigh, North Carolina 27604 ATC Associates of North Carolina, P.C. 9/17/2024 DC320021 Table of Contents DSCA ID No.: DC320021 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. ADT TOC Description Attachments Tables Groundwater concentration trend plots. 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. Table 1: Site Chronology DSCA ID No.: DC320021 Chronology of Events 11/8/1995 - Present A Cleaner World #203 operates as an active dry-cleaning facility in the source property building using tetrachloroethylene (PCE). 5/29/2013 The site was certified into the DSCA Program following due diligence sampling performed on behalf of the property owner. PCE and trichloroethylene (TCE) were detected in groundwater and soil on the source property. 5/9/2014 AMEC Environment & Infrastructure, Inc. (AMEC) performed initial site reconnaissance and a field survey to identify receptors within a 500-foot radius of the site and wells within one mile of the site. 6/16/2014 - 6/26/2014 AMEC performed Prioritization Assessment (PA) activities which included Level 1 Ecological Risk Assessment, advancement of 11 soil borings (SB-1 through SB-11), and installation and sampling of seven temporary wells (TMW-1 through TMW-7). Based on the results of the sampling, TMW-3 through TMW-7 were converted to permanent monitoring wells (MW-1 through MW-5), and TMW-1 and TMW-2 were abandoned. 10/2/2014 - 10/3/2014 AMEC performed assessment activities which included installation and sampling of monitoring well MW-6 and advancement of soil borings SB-12 and SB-13. 11/7/2014 AMEC submitted an Assessment Report. The report documented that impacted soil has been delineated and is limited to the area around the dry-cleaning machine and mister. The source area of impacted groundwater is also near the dry- cleaning machine and mister. Because the mister is mounted low on the building wall, it sprays partially on the driveway and may be an ongoing source of impact to soil and groundwater. The nearest surface water body is 1,100 feet away and appears unlikely to be impacted. No other receptors that have the potential to be impacted have been identified. 2/22/2017 - 2/24/2017 ATC Associates of North Carolina, P.C. (ATC) installed two monitoring wells (MW-7 and MW-8). 3/1/2017 - 3/2/2017 ATC completed a groundwater sampling event for monitoring wells MW-1 and MW-5 through MW-8. ATC also collected sub-slab gas samples from SS-1 and SS-2 from the source property building. 6/1/2017 ATC completed a groundwater sampling event for monitoring wells MW-1 and MW-5 through MW-8. 9/27/2017 - 9/28/2017 ATC completed a groundwater sampling event for monitoring wells MW-1 through MW-8. 11/20/2017 ATC completed a Groundwater Monitoring Report summarizing groundwater sampling events conducted in March, June, and September 2017 and a soil-gas sampling event conducted in March 2017. 11/12/2018 - 11/20/2018 ATC installed and sampled soil-gas monitoring points SGMP-1, SGMP-2, and SGMP-3. 3/19/2019 - 3/20/2019 ATC installed and sampled soil-gas monitoring points SGMP-4 and SGMP-6. Soil-gas monitoring point SGMP-5 was also installed but could not be sampled due to the presence of water. 8/22/2019 ATC sampled soil-gas monitoring points SGMP-4, SGMP-5, and SGMP-6. 8/24/2020 ATC submitted a Vapor Intrusion Assessment Letter Report documenting November 2018 and March 2019 activities. 11/8/2021 - 11/10/2021 ATC installed soil-gas monitoring points SGMP-7 through SGMP-9. ATC then sampled SGMP-4 through SGMP-8. Soil- gas monitoring point SGMP-9 could not be sampled due to the presence of water. 3/29/2022 ATC submitted a Soil-Gas Sampling Letter Report documenting November 2021 activities. 11/10/2022 ATC completed a groundwater sampling event for monitoring wells MW-1, MW-3, MW-5, MW-6, MW-7, and MW-8. ATC also installed temporary soil-gas monitoring points SGMP-10 and SGMP-11. 12/5/2022 ATC sampled soil-gas monitoring point SGMP-11. Soil-gas monitoring point SGMP-10 could not be sampled due to the presence of water. 3/8/2023 ATC submitted a Groundwater Monitoring and Soil-Gas Assessment Report documenting the November 2022 and December 2022 activities. 9/25-27/2023 ATC installed and sampled monitoring well MW-9. 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 1 Table 2: Analytical Data for Soil DSCA ID No.: DC320021 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 ) Ac e t o n e 0.01 0.41 6.1 0.09 0.39 0.0063 8.3 0.62 0.021 0.00021 9.9 25 SB-1 2 06/17/14 <0.0032 <0.0054 <0.0054 <0.011 <0.011 <0.0054 <0.0054 <0.0054 <0.0054 <0.0054 <0.0164 <0.054 SB-2 2 06/17/14 <0.0035 <0.0058 <0.0058 <0.012 <0.012 <0.0058 <0.0058 <0.0058 <0.0058 <0.0058 <0.0178 <0.058 SB-3 1 06/20/14 <0.0028 0.011 <0.0047 <0.0094 <0.0094 0.45 <0.0047 <0.0047 0.043 <0.0047 <0.0141 <0.047 SB-4 2 06/20/14 <0.0034 <0.0057 <0.0057 <0.011 <0.011 <0.0057 <0.0057 <0.0057 <0.0057 <0.0057 <0.0167 0.0086J SB-5 2 06/20/14 <0.0031 <0.0052 <0.0052 <0.010 <0.010 <0.0052 <0.0052 <0.0052 <0.0052 <0.0052 <0.0152 <0.052 2 06/20/14 <0.0030 <0.0050 <0.0050 <0.010 <0.010 0.0045J <0.0050 <0.0050 0.0021J <0.0050 <0.015 <0.050 6*06/20/14 <0.0027 <0.0045 <0.0045 <0.0090 <0.0090 0.0076 <0.0045 <0.0045 <0.0045 <0.0045 <0.0135 0.0067J SB-7 2 06/20/14 <0.0032 <0.0053 <0.0053 <0.011 <0.011 0.0023J <0.0053 <0.0053 <0.0053 <0.0053 <0.0163 <0.053 SB-8 3 06/20/14 <0.0039 <0.0066 <0.0066 <0.013 <0.013 0.0027J <0.0066 <0.0066 <0.0066 <0.0066 <0.0196 <0.066 SB-9 2 06/20/14 <0.0029 <0.0048 <0.0048 <0.0096 <0.0096 <0.0048 <0.0048 <0.0048 <0.0048 <0.0048 <0.0144 <0.048 SB-10 1 06/20/14 <0.0032 <0.0054 <0.0054 <0.011 <0.011 <0.0054 <0.0054 <0.0054 <0.0054 <0.0054 <0.0164 <0.054 SB-11 2 06/20/14 <0.0031 <0.0052 <0.0052 <0.010 <0.010 <0.0052 <0.0052 <0.0052 <0.0052 <0.0052 <0.0152 <0.052 SB-12 1 10/02/14 <0.0026 <0.0043 <0.0043 <0.0085 <0.0085 <0.0043 <0.0043 <0.0043 <0.0043 <0.0043 <0.013 0.042J SB-13 1 10/02/14 <0.0025 <0.0042 <0.0042 <0.0084 <0.0084 0.0019J <0.0042 <0.0042 <0.0042 <0.0042 <0.013 0.034J IHSB PSRGs = Inactive Hazardous Sites Branch Preliminary Soil Remediation Goals. BOLD values exceed IHSB PSRGs. * = Collected below the historical high water table. IHSB PSRG (July 2024) SB-6 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 ] [mg/kg] ADT 2 Page 1 of 1 Table 3: Analytical Data for Sub-slab Gas DSCA ID No.: DC320021 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 ) 160 3,500 490 4,700 36 3,500 440,000 3,500 180 280 8,800 SS-1 6 6 G 03/02/17 NA <4.0 NA NA NA 2,900 NA <8.0 33 <2.6 NA SS-2 6 6 G 03/02/17 NA <4.0 NA NA NA 1,200 NA <8.0 17 <2.6 NA NCDEQ = North Carolina Department of Environmental Quality. NR SGSL = Non-Residential Sub-slab and Exterior Soil Gas Screening Level TCR=1.0E-06 THQ=0.2. Bold values exceed NCDEQ NR SGSL. NA = Not Analyzed. NE = Not Established. < = Not detected above the Reporting Limit. Sa m p l e I D Sa m p l i n g D a t e ( m m / d d / y y ) NCDEQ NR SGSL (July 2024) De p t h [i n c h e s b g s ] 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 [µg/m3] 1 Indicate "G" for grab sample or for longer samples indicate the number of hours followed by "h". ADT 3 Page 1 of 1 Table 4: Analytical Data for Soil Gas DSCA ID No.: DC320021 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 ) 160 3,500 490 4,700 36 3,500 440,000 3,500 180 280 8,800 SGMP-1 5 G 11/20/18 NA <4.0 NA NA NA 410 NA <8.0 25 <2.6 NA SGMP-2 5 G 11/20/18 NA <20 NA NA NA 7,600 NA <40 77 <13 NA SGMP-3 5 G 11/20/18 NA <20 NA NA NA 13,000 NA <40 190 <13 NA 5 G 03/20/19 NA <4.0 NA NA NA 23 NA <8.0 <5.5 <2.6 NA 5 G 08/22/19 NA <4.0 NA NA NA 220 NA <8.0 <5.5 <2.6 NA 5 G 11/10/21 NA <3.5 NA NA NA 290 NA <3.5 <4.8 <2.3 NA 5 G 03/20/19 5 G 08/22/19 NA <40 NA NA NA 31,000 NA <80 380 <26 NA 5 G 11/10/21 NA <24 NA NA NA 9,400 NA <24 92 <16 NA 5 G 03/20/19 NA <4.0 NA NA NA 49 NA <8.0 <5.5 <2.6 NA 5 G 08/22/19 NA <4.0 NA NA NA 520 NA <8.0 9.4 <2.6 NA 5 G 11/10/21 NA <3.5 NA NA NA 900 NA <3.5 8.1 <2.3 NA SGMP-7 5 G 11/10/21 NA <6.8 NA NA NA 14 NA <6.8 <9.2 <4.4 NA SGMP-8 5 G 11/10/21 NA <6.9 NA NA NA 17 NA <6.9 31 <4.5 NA SGMP-9 5 G 11/10/21 SGMP-10 3 G 12/05/22 SGMP-11 5 G 12/05/22 NA <3.3 NA NA NA 49 NA <3.3 <4.5 <2.1 NA NCDEQ = North Carolina Department of Environmental Quality. NR SGSL = Non-Residential Sub-slab and Exterior Soil Gas Screening Level TCR=1.0E-06 THQ=0.2. Bold values exceed NCDEQ NR SGSL. NA = Not Analyzed. NE = Not Established. < = Not detected above the Reporting Limit. 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 [f e e t b g s ] [µg/m3] NCDEQ NR SGSL (July 2024) SGMP-4 Not sampled due to water in sampling line. SGMP-5 SGMP-6 Sa m p l e D u r a t i o n 1 Not sampled due to water in sampling line. Not sampled due to water in sampling line. ADT 4 Page 1 of 1 Table 6: Monitoring Well Construction Data DSCA ID No.: DC320021 Well ID Date Installed (mm/dd/yy)Number of Samples Well Depth [feet] Well Diameter [inch] Screen Interval [feet] Status (Active/Inactive) MW-1 06/17/14 5 30 2 15-30 Active MW-2 06/17/14 2 30 2 15-30 Active MW-3 06/17/14 3 33 2 18-33 Active MW-4 06/17/14 2 28 2 13-28 Active MW-5 06/17/14 5 30 2 15-30 Active MW-6 10/02/14 5 27 2 12-27 Active MW-7 02/22/17 4 30 2 15-30 Active MW-8 02/22/17 4 30 2 15-30 Active MW-9 09/26/23 1 48 2 43-48 Active ADT 6 Page 1 of 1 Table 7: Groundwater Elevation Data DSCA ID No.: DC320021 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] 06/26/14 1.87 92.41 ND NA NA 03/01/17 1.70 92.58 ND NA NA 06/01/17 4.65 89.63 ND NA NA 09/27/17 6.30 87.98 ND NA NA 11/10/22 6.43 87.85 ND NA NA 09/27/23 6.16 88.12 ND NA NA 06/26/14 5.59 88.69 ND NA NA 03/01/17 6.57 87.92 ND NA NA 06/01/17 6.67 87.82 ND NA NA 09/27/17 6.98 87.51 ND NA NA 11/10/22 7.89 86.60 ND NA NA 09/27/23 6.90 87.59 ND NA NA 06/26/14 2.73 92.06 ND NA NA 03/01/17 4.27 90.52 ND NA NA 06/01/17 2.74 92.05 ND NA NA 09/27/17 5.31 89.48 ND NA NA 11/10/22 6.98 87.81 ND NA NA 09/27/23 4.07 90.72 ND NA NA 06/26/14 4.76 93.67 ND NA NA 03/01/17 6.39 92.04 ND NA NA 06/01/17 5.22 93.21 ND NA NA 09/27/17 7.75 90.68 ND NA NA 11/10/22 10.03 88.40 ND NA NA 09/27/23 8.64 89.79 ND NA NA 06/26/14 5.34 89.60 ND NA NA 03/01/17 6.26 88.68 ND NA NA 06/01/17 5.20 89.74 ND NA NA 09/27/17 7.13 87.81 ND NA NA 11/10/22 8.13 86.81 ND NA NA 09/27/23 7.44 87.50 ND NA NA 03/01/17 6.84 87.15 ND NA NA 06/01/17 6.85 87.14 ND NA NA 09/27/17 7.40 86.59 ND NA NA 11/10/22 8.14 85.85 ND NA NA 09/27/23 7.90 86.09 ND NA NA 03/01/17 8.35 88.87 ND NA NA 06/01/17 7.22 90.00 ND NA NA 09/27/17 8.06 89.16 ND NA NA 11/10/22 10.26 86.96 ND NA NA 09/27/23 8.54 88.68 ND NA NA 03/01/17 4.94 84.31 ND NA NA 06/01/17 3.75 85.50 ND NA NA 09/28/17 4.36 84.89 ND NA NA 11/10/22 5.61 83.64 ND NA NA 09/27/23 5.59 83.66 ND NA NA MW-9 09/27/23 93.99 9.11 84.88 ND NA NA MW-5 MW-4 MW-3 MW-2 MW-1 94.28 94.49 94.79 98.43 94.94 MW-8 MW-7 MW-6 93.99 97.22 89.25 ADT 7 Page 1 of 1 Table 8: Analytical Data for Groundwater DSCA ID No.: DC320021 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 ) Ac e t o n e Me t h y l E t h y l K e t o n e ( M E K ) 1, 2 , 4 - T r i m e t h y l b e n z e n e Ca r b o n D i s u l f i d e 0.001 0.07 0.6 0.02 0.006 0.0007 0.6 0.1 0.003 0.00003 0.5 6 4 0.4 0.7 TMW-1 06/18/14 <0.00050 <0.00050 <0.00050 <0.00050 <0.0010 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.0015 <0.0050 <0.0050 <0.0050 <0.005 TMW-2 06/18/14 <0.00050 <0.00050 <0.00050 <0.00050 <0.0010 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.0015 0.0051 0.0029J <0.0050 <0.005 06/18/14 0.0011 <0.00050 <0.00050 <0.00050 <0.0010 0.017 <0.00050 <0.00050 0.0015 <0.00050 <0.0015 <0.0050 <0.0050 <0.0050 <0.005 03/01/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 0.00036J <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.0010 <0.0010 <0.004 06/01/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.00050 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 09/27/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 11/10/22 <0.00100 <0.00100 <0.00100 <0.00500 <0.00500 0.000428J <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 <0.0100 <0.0100 <0.00100 <0.00200 06/18/14 <0.00050 <0.00050 <0.00050 <0.00050 <0.0010 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.0015 0.0041J <0.0050 <0.0050 <0.005 09/27/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 06/18/14 <0.00050 <0.00050 <0.00050 <0.00050 <0.0010 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.0015 <0.0050 <0.0050 <0.0050 <0.005 09/27/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 11/10/22*<0.00100 <0.00100 <0.00100 <0.00500 <0.00500 <0.000500 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 <0.0100 <0.0100 <0.00100 <0.00200 06/18/14 <0.00050 <0.00050 <0.00050 <0.00050 <0.0010 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.0015 <0.0050 <0.0050 <0.0050 <0.005 09/27/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 06/18/14 <0.00050 <0.00050 <0.00050 <0.00050 <0.0010 0.0058 <0.00050 <0.00050 <0.00050 <0.00050 <0.0015 <0.0050 <0.0050 <0.0050 <0.005 03/01/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 0.00039J 0.00017J <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.0010 <0.0010 <0.004 06/01/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.00050 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 09/27/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 11/10/22 <0.00100 <0.00100 <0.00100 <0.00500 <0.00500 0.000770 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 <0.0100 <0.0100 <0.00100 <0.00200 10/03/14 <0.00050 <0.00050 <0.00050 <0.00050 <0.0010 0.0031 <0.00050 <0.00050 <0.00050 <0.00050 <0.0015 0.0029J <0.0050 <0.0050 <0.005 03/01/17 <0.0010 <0.0010 <0.0010 0.00051J <0.0020 0.020 0.00024J <0.0010 0.0016 <0.0020 0.00033J <0.050 <0.0010 0.00025J <0.004 06/01/17 <0.0010 <0.0010 <0.0010 0.00045J <0.00050 0.018 <0.001 <0.0010 0.0016 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 09/27/17 <0.0010 <0.0010 <0.0010 0.00097J <0.0020 0.0068 <0.0010 <0.0010 0.0006J <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 11/10/22 <0.00100 <0.00100 <0.00100 0.00182J <0.00500 0.00143 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 <0.0100 <0.0100 <0.00100 <0.00200 03/01/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 <0.00050 0.00019J <0.0010 <0.0010 <0.0020 <0.0030 0.010J <0.0010 <0.0010 <0.004 06/01/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.00050 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 0.0015J 09/27/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 11/10/22 <0.00100 <0.00100 <0.00100 <0.00500 <0.00500 <0.000500 <0.00100 <0.00100 0.000488J <0.00100 <0.00100 <0.0100 <0.0100 <0.00100 <0.00200 03/01/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.0010 <0.0010 <0.004 06/01/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.00050 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 09/28/17 <0.0010 <0.0010 <0.0010 <0.0010 <0.0020 <0.00050 <0.0010 <0.0010 <0.0010 <0.0020 <0.0030 <0.050 <0.020 <0.0010 <0.004 11/10/22 <0.00100 <0.00100 <0.00100 <0.00500 <0.00500 <0.000500 <0.00100 <0.00100 <0.00100 <0.00100 <0.00100 <0.0100 <0.0100 <0.00100 <0.00200 MW-9 09/27/23 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00050 <0.00100 0.0051J <0.0025 <0.00050 0.00014J Notes: Bold concentrations exceed 15A NCAC NC 2L .0202 Groundwater Quality Standards (2L Standards). <X: Below laboratory reporting limit of X. J = Estimated value below laboratory reporting limits. mg/L = Milligrams per liter. * = Due to laboratory internal standard failure for the initial in hold analysis, the sample MW-3 was reported from a reanalysis performed outside the method holding time. Gr o u n d w a t e r S a m p l i n g P o i n t Sa m p l i n g D a t e ( m m / d d / y y ) MW-8 MW-2 MW-3 MW-4 2L Standards (April 2022) MW-1 MW-5 MW-6 MW-7 [mg/L] ADT 8 Page 1 of 1 Table 12: Analytical Data for Natural Attenuation Parameters DSCA ID No.: DC320021 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 ) Sp e c i f i c C o n d u c t i v i t y 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 μs/cm2 std unit ° C mg/L mg/L mg/L 03/01/17 0.44 NA NA NA NA NA 90.7 NA NA NA 552 6.00 19.72 NA NA NA 06/01/17 0.94 NA NA NA NA NA 34.6 NA NA NA 569 6.23 22.28 NA NA NA 09/27/17 0.21 NA NA NA NA NA 103.2 NA NA NA 662 6.08 13.90 NA NA NA 11/10/22 0.93 NA NA NA NA NA 132.2 NA NA 556 507 6.22 20.40 NA NA NA MW-2 09/27/17 0.29 NA NA NA NA NA 89.0 NA NA NA 781 6.58 15.68 NA NA NA 09/27/17 0.57 NA NA NA NA NA 83.3 NA NA NA 548 6.59 15.93 NA NA NA 11/10/22 0.83 NA NA NA NA NA 105.5 NA NA 462 424 6.75 20.72 NA NA NA MW-4 09/27/17 0.20 NA NA NA NA NA 103.2 NA NA NA 954 6.03 15.14 NA NA NA 03/01/17 0.75 NA NA NA NA NA 119.8 NA NA NA 241 5.64 20.96 NA NA NA 06/01/17 0.76 NA NA NA NA NA 37.6 NA NA NA 673 6.47 23.52 NA NA NA 09/27/17 0.75 NA NA NA NA NA 125.9 NA NA NA 338 5.56 15.47 NA NA NA 11/10/22 0.84 NA NA NA NA NA 72.3 NA NA 163 146 5.47 19.58 NA NA NA 03/01/17 0.94 NA NA NA NA NA 92.0 NA NA NA 727 5.91 21.73 NA NA NA 06/01/17 1.45 NA NA NA NA NA 645.0 NA NA NA 754 6.03 25.40 NA NA NA 09/27/17 0.20 NA NA NA NA NA 121.8 NA NA NA 859 5.84 16.02 NA NA NA 11/10/22 0.77 NA NA NA NA NA 168.8 NA NA NA 554 512 21.01 NA NA NA 03/01/17 0.76 NA NA NA NA NA -269.0 NA NA NA 413 6.21 20.45 NA NA NA 06/01/17 1.01 NA NA NA NA NA -72.5 NA NA NA 476 6.69 22.58 NA NA NA 09/27/17 0.15 NA NA NA NA NA -73.1 NA NA NA 553 6.41 22.21 NA NA NA 11/10/22 1.38 NA NA NA NA NA 83.3 NA NA 371 344 5.84 21.12 NA NA NA 03/01/17 5.29 NA NA NA NA NA 48.1 NA NA NA 563 6.91 20.87 NA NA NA 06/01/17 3.33 NA NA NA NA NA 71.6 NA NA NA 718 6.88 24.21 NA NA NA 09/28/17 0.48 NA NA NA NA NA 87.2 NA NA NA 947 6.98 14.21 NA NA NA 11/10/22 0.88 NA NA NA NA NA 90.9 NA NA 590 552 6.84 21.56 NA NA NA MW-9 09/27/23 0.18 NA NA NA NA NA -322.0 NA NA 525 515 7.97 24.0 NA NA NA MW-7 MW-8 Sa m p l e I D MW-1 MW-5 MW-6 MW-3 ADT 12 Page 1 of 1 FA Y E T T E V I L L E R O A D MEDICAL OFFICE CENTER ATRIA SOUTHPOINT WALK A CLEANER WORLD #203 PRESSINGMACHINE ARE A PRESSINGMACHINE AREA LO B B Y KITCHENETTE AREA DRYCLEANINGMACHINE BOILER ROOM WASHINGMACHINE DRYER BATHROOMS FLOORDRAIN SINK CHEMICAL STORAGEROOM SPOTTING BOARD WASHINGMACHINE ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST STSTSTSTSTSTSTSTST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST STST ST ST ST ST ST ST ST ST ST ST ST ST STSTSTSTSTSTSTSTSTSTST STST ST ST ST ST ST ST ST ST ST ST ST ST SSSSSSSSSSSSSSSSSS SS SSW W W W W W W W W W W W W W W W W GGGGGGGGGGGGGGG G G ST ST ST ST ST ST ST ST ST ST STFFFF FFFFFFFFFFF F F F F F F F F F F OH E OH E OHE OHE OHE A CLEANER WORLD #203 MW-3 MW-1 MW-4 MW-2 MW-6 MW-5 MW-8 MW-7 NOTE: ALL LOCATIONS ARE APPROXIMATE LEGEND: MONITORING WELL Well Identification ST ST SS SS STORM SEWER SANITARY SEWER OHE F F W W OVERHEAD ELECTRIC FIBER OPTIC WATER DURHAM COUNTY PARCELS SOIL BORINGSB-1 Boring Identification SOURCE PROPERTY BOUNDARY G G GAS MW-1 SCALE: 1" = 40' 0 10 20 30 40 N DAVITA HOPE VALLEY DIALYSIS 0.063 TETRACHLOROETHYLENE ISOCONCENTRATION CONTOUR (DASHED WHERE INFERRED) (mg/kg) 0.0063 0.063 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 \ D A V I D . H U G H E S \ O N E D R I V E - O N E A T L A 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 \ 3 2 - 0 0 2 1 A C L E A N E R W O R L D \ D C 3 2 2 1 S L 1 0 - S O I L . D W G , AT T 1 . 2 . 3 SO I L Q U A L I T Y M A P 09/06/2024 SE E L O W E R L E F T A C L E A N E R W O R L D # 2 0 3 57 0 0 F A Y E T T E V I L L E R O A D DU R H A M , N O R T H C A R O L I N A DC 3 2 2 1 S L 1 0 AS SHOWN DH AO 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 to a s t a t e d a c c u r a c y . 2. Co n c e n t r a t i o n s a r e r e p o r t 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 ) . 3. Co n c e n t r a t i o n s s h o w n i n B O L D e x c e e d i t s r e s p e c t i v e P r e l i m i n a r y S o i l Re m e d i a t i o n G o a l ( P S R G ) . 4. Te t r a c h l o r o e t h y l e n e i s s h o w n p l u s a n y c o n s t i t u e n t a b o v e P S R G s . 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. * = s a m p l e c o l l e c t e d b e l o w t h e h i s t o r i c a l h i g h w a t e r t a b l e . N o t u s e d t o co n s t r u c t c o n t o u r s . 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 3 2 0 0 2 1 FAY E T T E V I L L E R O A D MEDICAL OFFICE CENTER ATRIA SOUTHPOINT WALK A CLEANER WORLD #203 MW-1 MW-2 MW-6 MW-5 MW-8 MW-7 MW-3 MW-4 DAVITA HOPE VALLEY DIALYSIS WOOD C R O F T P A R K W A Y 320 330 34 0 34 0 35 0 350 350 350 350 350 360 360 322 324 326 328 33 2 334 33 4 33 6 33 6 33 8 33 8 342 34 2 34 4 34 4 346 346 346 34 6 348 348 348 348 35 2 352 352 35 2 35 4 35 4 35 6 35 6 358 358 NOTE: ALL LOCATIONS ARE APPROXIMATE LEGEND: MONITORING WELL Well Identification DURHAM COUNTY PARCELS SOURCE PROPERTY BOUNDARY MW-1 DURHAM COUNTY TOPOGRAPHY350 N SCALE: 1" = 80' 0 20 40 60 80 MW-9 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 \ D A V I D . H U G H E S \ O N E D R I V E - O N E A T L A 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 \ 3 2 - 0 0 2 1 A C L E A N E R W O R L D \ D C 3 2 2 1 S L 1 0 - S I T E . D W G , AT T 4 SI T E M A P 09/06/2024 SE E L O W E R L E F T A C L E A N E R W O R L D # 2 0 3 57 0 0 F A Y E T T E V I L L E R O A D DU R H A M , N O R T H C A R O L I N A DC 3 2 2 1 S L 1 0 AS SHOWN DH AO 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 3 2 0 0 2 1 FAY E T T E V I L L E R O A D MEDICAL OFFICE CENTER ATRIA SOUTHPOINT WALK A CLEANER WORLD #203 MW-2 MW-6 MW-5 MW-8 MW-7 MW-3 MW-4 DAVITA HOPE VALLEY DIALYSIS WOOD C R O F T P A R K W A Y 320 330 34 0 34 0 35 0 350 350 350 350 350 360 360 322 324 326 328 33 2 334 33 4 33 6 33 6 33 8 33 8 342 34 2 34 4 34 4 346 346 346 34 6 348 348 348 348 35 2 352 352 35 2 35 4 35 4 35 6 35 6 358 358 NOTE: ALL LOCATIONS ARE APPROXIMATE LEGEND: DURHAM COUNTY PARCELS SOURCE PROPERTY BOUNDARY DURHAM COUNTY TOPOGRAPHY350 N SCALE: 1" = 80' 0 20 40 60 80 MW-9 88.0 GROUNDWATER ELEVATION CONTOUR (DASHED WHERE INFERRED) (ft) GROUNDWATER FLOW DIRECTION MW-7 88.68 MONITORING WELL Well Identification Relative Groundwater Elevation (ft) 90.72 88.12 89.79 87.50 84.88 86.09 88.68 83.66 87.59 MW-1 84 . 0 85 . 0 86 . 0 87 . 0 88 . 0 89 . 0 90.0 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 \ D A V I D . H U G H E S \ O N E D R I V E - O N E A T L A 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 \ 3 2 - 0 0 2 1 A C L E A N E R W O R L D \ D C 3 2 2 1 S L 1 0 - P O T . 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 09/06/2024 SE E L O W E R L E F T A C L E A N E R W O R L D # 2 0 3 57 0 0 F A Y E T T E V I L L E R O A D DU R H A M , N O R T H C A R O L I N A DC 3 2 2 1 S L 1 0 AS SHOWN DH AO 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. Gr o u n d w a t e r e l e v a t i o n s m e a s u r e d o n S e p t e m b e r 2 7 , 2 0 2 3 . 3. De e p w e l l M W - 9 n o t u s e d i n c o n s t r u c t i o n o f c o n t o u r s . 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 3 2 0 0 2 1 FAY E T T E V I L L E R O A D MEDICAL OFFICE CENTER ATRIA SOUTHPOINT WALK A CLEANER WORLD #203 MW-1 MW-2 MW-6 MW-5 MW-8 MW-7 MW-3 MW-4 DAVITA HOPE VALLEY DIALYSIS WOOD C R O F T P A R K W A Y 320 330 34 0 34 0 35 0 350 350 350 350 350 360 360 322 324 326 328 33 2 334 33 4 33 6 33 6 33 8 33 8 342 34 2 34 4 34 4 346 346 346 34 6 348 348 348 348 35 2 352 352 35 2 35 4 35 4 35 6 35 6 358 358 NOTE: ALL LOCATIONS ARE APPROXIMATE LEGEND: MONITORING WELL Well Identification DURHAM COUNTY PARCELS SOURCE PROPERTY BOUNDARY MW-1 DURHAM COUNTY TOPOGRAPHY350 N SCALE: 1" = 80' 0 20 40 60 80 MW-9 0.0007 0.0007 TETRACHLOROETHYLENE ISOCONCENTRATION CONTOUR (DASHED WHERE INFERRED) (mg/L) 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 \ D A V I D . H U G H E S \ O N E D R I V E - O N E A T L A 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 \ 3 2 - 0 0 2 1 A C L E A N E R W O R L D \ D C 3 2 2 1 S L 1 0 - G W . 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 09/06/2024 SE E L O W E R L E F T A C L E A N E R W O R L D # 2 0 3 57 0 0 F A Y E T T E V I L L E R O A D DU R H A M , N O R T H C A R O L I N A DC 3 2 2 1 S L 1 0 AS SHOWN DH AO 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 to a s t a t e d a c c u r a c y . 2. Co n c e n t r a t i o n s i n BO L D e x c e e d t h e 2 L S t a n d a r d . 3. Bo x e s s h o w t e t r a c h l o r o e t h y l e n e , p l u s a n y o t h e r c o n s t i t u e n t s d e t e c t e d ab o v e 2 L S t a n d a r d s . 4. Re s u l t s a r e r e p o r t e d i n m i l i l g r a m s p e r l i t e r ( m g / L ) . 5. J = E s t i m a t e d v a l u e . 6. Te t r a c h l o r o e t h y l e n e i s t h e o n l y c o m p o u n d d e t e c t e d a b o v e 2 L S t a n d a r d s . 7. Co n t o u r s a r e b a s e d o n m a x i m u m c o n c e n t r a t i o n s a t a n y d e p t h . 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 3 2 0 0 2 1 FA Y E T T E V I L L E R O A D MEDICAL OFFICE CENTER ATRIA SOUTHPOINT WALK ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST STSTSTSTSTSTSTSTST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST ST STST ST ST ST ST ST ST ST ST ST ST ST ST STSTSTSTSTSTSTSTSTSTST STST ST ST ST ST ST ST ST ST ST ST ST ST SSSSSSSSSSSSSSSSSS SS SSW W W W W W W W W W W W W W W W W GGGGGGGGGGGGGGG G G ST ST ST ST ST ST ST ST ST ST STFFFF FFFFFFFFFFF F F F F F F F F F F OH E OH E OHE OHE OHE A CLEANER WORLD #203 SGMP-1 SGMP-3SGMP-2 MW-3 MW-1MW-4 MW-2 MW-6 MW-5 MW-8 LEGEND: MONITORING WELL SOURCE PROPERTY BOUNDARY ST STORM SEWER SANITARY SEWER OHE F F W W OVERHEAD ELECTRIC FIBER OPTIC WATER DURHAM COUNTY PARCELS NOTE: ALL LOCATIONS ARE APPROXIMATE G G GAS Well Identification SS MW-1 SGMP-6 Sample Identification SGMP-2 Sample Identification SOIL-GAS MONITORING POINT RESIDENTIAL RISK EXCEEDANCE SGMP-6 SGMP-5 SGMP-4 SGMP-9 SGMP-8 SGMP-7 SGMP-9 Sample Identification SOIL-GAS MONITORING POINT NOT SAMPLED SOIL-GAS MONITORING POINT NO RISK EXCEEDANCE W W W W W W SS SS SS SS SS SS F F F F F F F F F F F F F E E E E E E E E E E E E E E E ELECTRICAL UNDERGROUND SGMP-10 SGMP-11 DAVITA HOPE VALLEY DIALYSIS SS-2 SS-1 PRESSINGMACHINE AREA PRESSINGMACHINE ARE A LO B B Y KITCHENETTE AREA DRYCLEANING MACHINE BOILERROOM WASHINGMACHINE DRYER BATHROOMS FLOORDRAIN CHEMICAL STORAGEROOM SPOTTINGBOARD SS-1 Sample Identification SUB-SLAB SAMPLE RESIDENTIAL 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 \ D A V I D . H U G H E S \ O N E D R I V E - O N E A T L A 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 \ 3 2 - 0 0 2 1 A C L E A N E R W O R L D \ D C 3 2 2 1 S L 1 0 - V I . D W G , AT T 1 3 . 1 4 VA P O R I N T R U S I O N A N A L Y T I C A L M A P 09/17/2024 SE E L O W E R L E F T A C L E A N E R W O R L D # 2 0 3 57 0 0 F A Y E T T E V I L L E R O A D DU R H A M , N O R T H C A R O L I N A DC 3 2 2 1 S L 0 9 AS SHOWN DH AO 13/14 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. bg s = b e l o w g r o u n d s u r f a c e . 3. μg / m 3 = m i c r o g r a m s p e r c u b i c m e t e r . 4. CR = C a r c i n o g e n i c R i s k ; H I = 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 . 5. Va l u e s s h o w n BO L D /BO L D e x c e e d r e p r e s e n t a t i v e R i s k L e v e l s . 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 3 2 0 0 2 1