The URL can be used to link to this page

Home My WebLink About21008_Peace St_IAWPDC920048_20181022Interim Action Work Plan Rollins Cleaners 407 W. Peace Street Raleigh, North Carolina DSCA ID No. DC9200048 H&H Job No. DSO-79F October 22, 2018 hart O• hickman w SMARTER ENVIRONMENTAL SOLUTIONS #C-1269 Engineering #245 Geology 2923 South Tryon Street, Suite 100 3921 Sunset Ridge Rd, Suite 301 Charlotte, NC 28203 Raleigh, NC 27607 www.harthickman.com 704.586.0007 main 919.847.4241 main Interim Action Work Plan Rollins Cleaners 407 W. Peace Street, Raleigh, NC DSCA ID No. DC9200048 H&H Project No. DSO-79F Table of Contents Section Pate No. 1.0 Introduction..............................................................................................................................1 2.0 Background..............................................................................................................................2 3.0 Pre -Excavation Activities........................................................................................................4 3.1 Site Security...........................................................................................................................4 3.2 Utility Locating.....................................................................................................................4 4.0 Proposed Excavation Activities..............................................................................................5 4.1 Concrete Characterization and Disposal............................................................................5 4.2 Hazardous Soil Excavation and On -Site Treatment..........................................................6 5.0 Proposed Confirmation Sampling..........................................................................................8 6.0 Remedial Amendment.............................................................................................................9 7.0 Site Restoration......................................................................................................................10 8.0 Health and Safety...................................................................................................................11 I VAhhfsOl.harthickman.localAmasterfilesVAAA-Master Projects\DSCA - DSOADSO-79 Rollins Economy Cleaners\Reports\2018-10_Interim Action Work Plan\DC920048 20181022 InterimActionWorkPlan.doc Am hart hickman SMARTER ENVIRONMENTAL SOLUTIONS Table 1 Figure 1 Figure 2 Figure 3 Ust of Tahles Analytical Data for Soil List of Figures Site Location Map Site Map Proposed Soil Interim Action Areas (Surficial Soil, <3 ft bgs) Figure 4 Proposed Soil Interim Action Areas (Subsurface Soil, >3 ft bgs) List of Appendices Appendix A Site Photographs ii \\hhfsOl.harthickman.local\rnasterfiles\A, A -Master Projects\DSCA - DSO\DSO-79 Rollins Economy Cleaners\Reports\2018-10_Interim Action Work Plan\DC920048 20181022 InterimActionWorkPlan.doc hart hickman SMARTER ENVIRONMENTAL SOLUTIONS 1.0 Introduction Per the request of the North Carolina Department of Environmental Quality (DEQ) Dry-cleaning Solvent Cleanup Act (DSCA) Program, Hart & Hickman, PC (H&H) has prepared this work plan for completion of an interim action to address source area soil impacts at the Rollins Cleaners site located at 407 W. Peace Street, in Raleigh, North Carolina. A site location map is provided as Figure 1, and the layout of the site is shown on Figure 2. Previous assessment activities identified the dry-cleaning solvent tetrachloroethylene (PCE) and other constituents in site soils. The property owner plans to demolish the building where the former dry-cleaning operations were conducted and redevelop the property. Following demolition of the building, the DSCA Program plans to conduct an interim action to remove source area soil impacts. The proposed interim action activities will include: • Sampling, removal, and disposal of concrete currently covering the proposed excavation areas • Excavation and on -site treatment of hazardous soil with subsequent off -site disposal as non -hazardous waste • Sampling and analysis of treated soil prior to off -site disposal • Collection and analysis of confirmation samples from the sidewalls of each excavation area • Application and blending of chemical oxidant in the base of each excavation • Site restoration, including backfilling and compaction of the excavated areas This work plan provides background site information and describes the proposed interim action activities. 1 \\hhfsOl.harthickman.local\rnasterfiles\A, A -Master Projects\DSCA - DSO\DSO-79 Rollins Economy Cleaners\Reports\2018-10_Interim Action Work Plan\DC920048 20181022 InterimActionWorkPlan.doc hart hickman SMARTER ENVIRONMENTAL SOLUTIONS 2.0 Background Based on historical records, dry-cleaning operations began at the site as early as 1950. Until approximately 1986, PCE and Stoddard solvent were the primary solvents used by the facility. Dry-cleaning operations ceased in mid-2017, and the building is currently vacant. Historically, Stoddard solvent used for dry-cleaning was stored in both an interior aboveground storage tank (AST) and an exterior underground storage tank (UST). The UST was formerly located near the southwest corner of the building and was removed in October 2017. The approximate location of the former UST is shown on Figure 2. Assessments completed under the DSCA Program indicate that soil and groundwater have been impacted by dry-cleaning constituents. The site entered the DSCA Program in June 2013 and assessment activities were completed in 2013, 2014 and 2017. The assessment results indicate that soil and groundwater have been impacted by both PCE and Stoddard solvent. The soil analytical results are summarized in Table 1, and the extents of PCE soil impacts are depicted on Figures 3 and 4. PCE has been detected in soil at concentrations up to 12,900 mg/kg and in groundwater at concentrations up to 955 mg/L. Due to the extensive soil impacts at the site, the DSCA Program plans to conduct an interim action to address the gross soil contamination. Because only source area impacts are being addressed, the DSCA Program selected a target clean-up level for PCE of 170 mg/kg for the interim action. This value is based on the Environmental Protection Agency's (EPA's) Gat value for PCE, which is the saturation concentration that reflects physical limits on soil concentrations. Based on this target level, the three areas depicted on Figures 3 and 4 will be excavated. Soil within each area will be excavated to the water table, which is present at an approximate depth of 7 feet below ground surface (ft bgs). Soil at the site is considered to be a listed hazardous waste (F002), by the DSCA Program. Due to site constraints, managing the soil in roll -off boxes in accordance with the "Contained -In" 2 hart hickman \\hhfsOl.harthiclanm.local\rnasterfiles\AAA-Master Projects\DSCA - DSO\DSO-79 Rollins Economy Cleaners\Reports\2018-10_Interim Action Work SMAIRER ENVIRONMENTAL SOLUMONS Plan\DC920048 20181022 InterimActionWorkPlan.doc Policy' is not feasible. Furthermore, based on the PCE concentrations detected at the site, some of the soil is expected to contain concentrations above "Contained -Out" levels requiring disposal as hazardous waste. Thus, the selected remedy is to excavate the impacted hazardous soil, treat the soil to non -hazardous levels on -site using EVO Corporation's mobile steam distillation unit, and dispose of the treated soil off -site as non -hazardous waste. ' North Carolina Hazardous Waste Section, "Contained -In" Policy for Soil Contaminated with Listed Hazardous Waste, Revised June 28, 2016. 3 hart19 hickman \\hhfsOl.harthickman.local\rnasterfiles\AAA-Master Projects\DSCA - DSO\DSO-79 Rollins Economy Cleaners\Reports\2018-10_Interim Action Work SMARTER ENVIXONMENfAL SOLV11ON5 Plan\DC920048 20181022 InterimActionWorkPlan.doc 3.0 Pre -Excavation Activities 3.1 Site Security Demolition of the former dry cleaner building is scheduled for late October/early November by D.H. Griffin of Greensboro, NC, on behalf of the property owner, Chaucer Investments, LLC, in preparation for redevelopment of the property. The demolition contractor will leave the existing floor slab in the southern half of the building in place to minimize potential exposure to the known soil contamination. As part of the demolition activities, a temporary construction fence will be installed around the perimeter of the property. The fence will remain in place until the excavation and backfilling activities are completed. The gate to the fenced area will be closed and locked nightly following each work day to prevent access to the work area by the public. 3.2 Utility Locating H&H will submit a locate request to North Carolina 811 to perform a public utility locate for the proposed excavation areas. In addition to the public utility locate, H&H will contract a private utility locator to mark subsurface utilities identified in and near the proposed excavation areas. The private utility locator will use ground penetrating radar and radio detection tooling to identify subsurface utilities. Any identified utilities will be marked and avoided during excavation activities. 2 \\hhfsOl.harthickman.local\rnasterfiles\A, A -Master Projects\DSCA - DSO\DSO-79 Rollins Economy Cleaners\Reports\2018-10_Interim Action Work Plan\DC920048 20181022 InterimActionWorkPlan.doc hart hickman SMARTER ENVIRONMENTAL SOLMONS 4.0 Proposed Excavation Activities H&H plans to contract EVO Corporation (EVO) of Winston-Salem, NC to perform the interim action. As discussed below, the proposed excavation activities will include characterization and disposal of concrete; excavation and on -site treatment of hazardous soil with subsequent off -site disposal as non -hazardous waste; and addition and blending of a chemical oxidant and activator in the base of each excavation. Photographs of the proposed excavation areas are provided in Appendix A. 4.1 Concrete Characterization and Disposal Due to the potential for dry-cleaning solvents to be present in the concrete slab from possible historical spills, H&H plans to collect concrete samples for waste characterization purposes prior to the start of excavation activities. In an email dated October 5, 2018, Richard Concepci6n with the DEQ Hazardous Waste Section approved a variance to the "Contained -In" Policy to allow sampling and characterization of the concrete in situ prior to its removal. Based on the estimated volume of concrete to be removed (13 cubic yards), Mr. Concepci6n advised that two samples analyzed for toxicity characteristic leaching procedure (TCLP) volatile organic compounds (VOCs) will be sufficient to characterize the concrete. Following demolition of the site building, H&H will collect two samples of concrete from the proposed excavation areas and submit the samples to a North Carolina certified laboratory for analysis of TCLP VOCs by EPA Method 8260B. The sample results will be compared to "Contained -Out" levels, and the concrete will be properly disposed based on the results. Based on experience at other DSCA sites, the concrete concentrations are expected to be below "Contained -Out" levels. As such, it is expected that the concrete will be saw cut from each proposed excavation area and loaded into dump trucks for subsequent transportation and disposal off -site as non -hazardous waste. 5 \\hhfsOl.harthickman.local\rnasterfiles\A, A -Master Projects\DSCA - DSO\DSO-79 Rollins Economy Cleaners\Reports\2018-10_Interim Action Work Plan\DC920048 20181022 InterimActionWorkPlan.doc 19 hart hickman SMARTER ENVIRONMENTAL SOLUTIONS 4.2 Hazardous Soil Excavation and On -Site Treatment The impacted soils at the site are considered a listed F002 hazardous waste by the DEQ Hazardous Waste Section. In addition, a large portion of the impacted soil is believed to contain impacts above the Hazardous Waste Section's "Contained -Out" level for PCE. To cost- effectively perform the interim action, the excavated soils will be treated on -site using EVO's permitted mobile steam distillation (MSD) unit and the treated soil will be subsequently disposed off -site as non -hazardous waste. MSD is an ex -situ process that uses steam and pressure to remove contaminants from soil. One MSD unit will be used at the Rollins Cleaners site with the unit capable of treating 24 tons of soil per batch. Based on the concentrations present at the site, each batch is expected to take approximately 2 to 3 hours to process. The interim action will be conducted by: • Excavating the impacted soil and loading it into the MSD unit • Sealing the MSD unit, injecting pressurized steam to decrease contaminant concentrations below hazardous levels, and filtering out contaminants from the steam condensate • Stockpiling and sampling (by EVO) the treated soil to confirm the soil had been treated to non -hazardous levels • Disposing of the treated, stockpiled soil as non -hazardous waste The three excavation areas are shown on Figures 3 and 4. The areal extent of excavation A is estimated to be 187 sq ft, excavation B is estimated to be 508 sq ft, and excavation C is estimated to be 403 sq ft. It is anticipated that the depth of each excavation will extend to the water table, which is estimated to be 7 ft bgs. Based on these estimated, the total volume of excavated soil will be approximately 285 cubic yards (428 tons assuming 1.5 tons per cubic yard). The lateral extents of proposed excavation areas were estimated based on pre -excavation soil analytical results. Sidewall confirmation samples will be collected to confirm that the PCE target cleanup concentration of 170 mg/kg has been met. If the cleanup level is exceeded, additional excavation will occur until sidewall confirmation samples are below the target PCE concentration. 6 hart hickman \\hhfsOl.harthickman.local\rnasterfiles\AAA-Master Projects\DSCA - DSO\DSO-79 Rollins Economy Cleaners\Reports\2018-10_Interim Action Work SMARTER ENVIRONMENTAL SOLUTIONS Plan\DC920048 20181022 InterimActionWorkPlan.doc Additional details regarding the confirmation sampling procedure are provided in Section 5.0 below. Following treatment in the MSD units, the treated soils will be stockpiled on plastic sheeting pending characterization for final disposal. EVO will collect soil samples from each treated stockpile and submit the samples to a North Carolina certified laboratory for TCLP VOC analysis. These samples will be used to confirm that each stockpile had been treated to non- hazardous levels. Following acceptable waste characterization analytical results, the treated soil will be disposed off -site as non -hazardous waste at EVO's permitted facility in Winston-Salem, NC. At the conclusion of the on -site treatment activities, activated carbon and filters utilized in the MSD process will be transported from the site and disposed of as hazardous waste at a permitted disposal facility. The manifests and disposal documentation for the concrete, soil, activated carbon, and filters will be maintained and included in an Interim Action Completion Report, which will be submitted to the DSCA Program after completion the interim action activities. 7 \\hhfsOl.harthickman.local\rnasterfiles\A, A -Master Projects\DSCA - DSO\DSO-79 Rollins Economy Cleaners\Reports\2018-10_Interim Action Work Plan\DC920048 20181022 InterimActionWorkPlan.doc hart hickman SMARTER ENVIRONMENTAL SOLMONS 5.0 Proposed Confirmation Sampling Confirmation samples will be collected from the sidewalls of the excavations to document concentrations remaining in place at the completion of the interim action. Sidewall confirmation samples will be collected at a frequency of one sample for every 20 feet of lateral excavation. Because the excavations will extend to the water table, confirmation samples will not be collected from the base of the excavations. The confirmation sample locations will be determined by first screening each sidewall using a photoionization detector (PID) to determine the level of volatile vapors present. Samples will be then collected for laboratory analysis from the areas exhibiting the highest PID readings. The sidewall samples will be collected in laboratory -prepared sample containers and submitted to a North Carolina accredited laboratory for analysis of VOCs by EPA Method 8260B. If the target PCE concentration of 170 mg/kg is exceeded in a sidewall sample, additional excavation of that sidewall will be conducted. Once field screening with the PID indicates a reduction of volatile vapors, another confirmation sample will be collected. The excavation of each area will be considered complete once the final sidewall samples exhibit PCE concentrations below the target level of 170 mg/kg. \\hhfsOl.harthickman.local\rnasterfiles\A, A -Master Projects\DSCA - DSO\DSO-79 Rollins Economy Cleaners\Reports\2018-10_Interim Action Work Plan\DC920048 20181022 InterimActionWorkPlan.doc hart hickman SMARTER ENVIRONMENTAL SOLMONS 6.0 Remedial Amendment Following completion of the excavation activities, a remedial amendment will be added at the base of the excavation. The remedial amendment chosen is the chemical oxidant, Klozur SP (sodium persulfate) from PeroxyChem. Klozur SP was chosen due to its proven treatability of the contaminants of concern and its ease of use as a powder that can be added directly to the excavations. Klozur SP is effective for treating high levels of chlorinated solvents expected to be present in groundwater at the base of the excavations. Klozur SP is also fast -acting and is expected to oxidizing the contaminants over the course of a few months or less. The Klozur SP will be activated by the addition of hydrated lime. Hydrated lime was chosen as the activator due to its solid state and suitability for mixing with Klozur SP at the base of the excavation. The amount of Klozur SP to be mixed into the excavations is estimated as 2,755 lbs delivered in 55 lb bags. To activate this quantity of Klozur SP, PeroxyChem estimated 1,097 lbs of hydrated lime will be needed. EVO will evenly distribute the Klozur SP and hydrated lime into each excavation and will mix the remedial amendments into the soil at the groundwater interface using an excavator bucket. 0 \\hhfsOl.harthickman.local\rnasterfiles\A, A -Master Projects\DSCA - DSO\DSO-79 Rollins Economy Cleaners\Reports\2018-10_Interim Action Work Plan\DC920048 20181022 InterimActionWorkPlan.doc hart hickman SHARER ENVIRONMENTAL SOLMONS 7.0 Site Restoration Following the application and mixing of the remedial amendment, EVO will backfill each of the excavation areas. A one to two -foot layer of #57 stone will be placed in the base of each excavation to bridge the water table. Orange safety fence will be placed on top of the gravel layer and along the sidewalls of each excavation to allow the property owner to easily identify the excavation extents during future redevelopment activities. The excavations will then be backfilled and compacted in one -foot lifts using backfill material supplied by Wake Stone in Knightdale, NC. Compaction testing may be performed by the property owner's contractor, if desired. The excavations will be backfilled to match the existing surrounding grade. 10 \\hhfsOl.harthickman.local\rnasterfiles\A, A -Master Projects\DSCA - DSO\DSO-79 Rollins Economy Cleaners\Reports\2018-10_Interim Action Work Plan\DC920048 20181022 InterimActionWorkPlan.doc 19 hart hickman SMARTER ENVIRONMENTAL SOLl/T1ONS 8.0 Health and Safety Prior to commencing site work, a health and safety plan (HASP) will be prepared to guide the safe execution of the planned activities. The HASP will outline the following requirements/precautions: 1. Personnel involved with site remedial activities will have appropriate training [i.e., either a 40-hour or 24-hour OSHA -required (29 CFR 1910.120) health and safety course for hazardous waste work, or certified equivalent training]. 2. A safety meeting will be conducted each day before site activities occur. The meeting will address health & safety topics and the day's planned activities. 3. H&H will conduct on -site ambient air monitoring that will include periodic monitoring in the workers' breathing zone and site area for VOCs and dust (if appropriate) using an organic vapor analyzer (OVA) and a direct reading dust level meter. The perimeter of the work area will also be monitored periodically during work activities. Contaminant levels will be compared to established action levels in the HASP. If action levels are exceeded, engineering controls will be implemented. If needed, PPE will be upgraded for worker protection. 4. Remedial activities will be conducted in Level D (safety shoes, goggles/safety glasses, hard hat, and work gloves) PPE unless ambient monitoring indicates exceedances of action levels. EVO will have necessary PPE on -site for employees to upgrade to Level C protection, if warranted. Tyvek coveralls will be used by employees with a risk of coming into direct contact with the contaminated soil and debris. 5. During site setup and before initiation of remedial action activities, EVO and H&H will establish safety zones as required under OSHA 1910.120. EVO and H&H will also establish an exclusion zone and personnel/equipment decontamination zones. Personnel and equipment that work in contaminated areas will be decontaminated prior to exiting the area. 6. H&H and EVO will have the ability to stop work at any time if unsafe conditions are observed. is 11 hart hickman \\hhfsOl.harthickmm.local\rnasterfiles\AAA-Master Projects\DSCA - DSO\DSO-79 Rollins Economy Cleaners\Reports\2018-10_Interim Action Work SMARTER ENVIRONMENTAL SOLUTIONS Plan\DC920048 20181022 InterimActionWorkPlan.doc Table 14 hart hickman SMARTER ENVIRONMENTAL SOLUTIONS Table 1: Analytical Data for Soil DSCA ID No.: DC920048 N N 75 Ga N U A aNN A r ° o W N N A N M W W W U U A [mg/kg] SB-1 1-2 02/07/13 <0.00185 <0.00185 <0.00185 <0.00185 <0.00463 <0.00185 <0.00185 <0.00185 <0.00185 <0.00185 <0.00463 0.0716 <0.00185 <0.00185 <0.00185 <0.00185 <0.00185 <0.00185 <0.0463 <0.00185 6-7 02/07/13 <0.00201 10.00201 <0.00201 <0.00201 <0.00502 <0.00201 <0.00201 <0.00201 <0.00201 <0.00201 <0.00502 <0.0502 <0.00201 <0.00201 <0.00201 <0.00201 <0.00201 <0.00201 <0.0502 <0.00201 SB-2 1-2 02/07/13 0.00833 0.0334 9.10 <0.00184 30.0 <0.00184 0.00493 0.00513 <0.00184 0.150 0.235 <0.0460 <0.00184 <0.00184 <0.00184 36.1 220 51.1 <0.0460 43.7 6-7 02/07/13 0.0123 <0.00204 1.55 <0.00204 7.87 <0.00204 <0.00204 <0.00204 <0.00204 0.0196 <0.00510 0.0696 0.00402 <0.00204 <0.00204 10.8 1.83 <0.149 0.284 17.1 SB-3 1-2 02/07/13 <0.00199 0.0881 <0.00199 <0.00199 0.0126 0.828 0.00949 0.00361 0.152 <0.00199 <0.00497 0.0628 <o.00199 0.0160 <0.00199 <0.00199 <0.00199 <0.00199 <0.0497 0.0127 6-7 02/07/13 <0.00196 0.0335 <0.00196 <0.00196 <0.00489 0.00337 0.0208 <0.00196 0.00659 <0.00196 <0.00489 <0.0489 <0.00196 <0.00196 <0.00196 <0.00196 <0.00196 <0.00196 <0.0489 <0.00196 SB-4 1-2 02/07/13 <0.00190 0.673 <0.00190 <0.00190 <0.00475 40.4 <0.00190 0.00460 0.833 <0.00190 <0.00475 <0.0475 <0.00190 0.0212 <0.00190 <0.001901 0.0114 0.00470 <0.0475 <0.00190 5-6 02/07/13 <0.00194 9.82 0.00637 <0.00194 3.35 5,650 <0.00194 0.0576 <123 0.00938 0.0852 0.0495 <0.00194 0.0923 <0.00194 0.0183 0.311 3.23 <0.0484 0.720 SB-5 1-2 02/07/13 <0.00229 2.19 <0.00229 <0.00229 <0.00572 31.8 <0.00229 0.00816 5.57 <0.00229 <0.00572 <0.0572 <0.00229 0.0125 <0.00229 <0.00229 <0.00229 <0.00229 <0.0572 <0.00229 5-6 02/07/13 <0.00185 28.3 0.183 <0.00185 2.09 1.82 0.00689 0.303 23.4 0.398 0.0426 <0.0462 <0.00185 0.0552 0.0237 0.0807 3.51 0.964 <0.0462 5.11 SB-6 1-2 02/07/13 <0.00173 0.143 <0.00173 <0.00173 <0.00432 15.0 <0.00173 0.00184 3.73 <0.00173 <0.00432 <0.0432 <0.00173 0.00182 <0.00173 <0.00173 <0.00173 <0.00173 <0.0432 <0.00173 5-6 02/07/13 <0.00219 0.123 <0.00219 <0.00219 <0.00547 0.105 <0.00219 <0.00219 1.04 0.228 <0.00547 <0.0547 <0.00219 <0.00219 <0.00219 <0.00219 <0.00219 <0.00219 <0.0547 <0.00219 SB-7 2-3 09/16/13 <0.012 <0.012 <0.012 NA <0.058 <0.012 <0.012 <0.012 <0.012 0.009J <0.035 NA NA NA <0.0121 0.022 1 0.005J <0.0121 NA 0.010J 5-6 09/16/13 <0.013 <0.013 0.008J NA 0.006J <0.013 <0.013 <0.013 <0.013 <0.013 0.006J NA NA NA <0.013 0.17 <0.013 <0.013 NA 0.29 SB-8 2-3 09/16/13 <0.242 0.34 0.40 NA 0.35J <0.242 <0.242 <0.242 <0.242 0.53 0.51J NA NA NA <0.242 1.6 0.45 0.16J NA 1.1J 5-6 09/16/13 <0.49 <0.49 0.28J NA 0.26J <0.49 <0.49 <0.49 <0.49 <0.49 0.37J NA NA NA <0.49 7.4 <0.49 <0.49 NA 14 SB-9 2-3 09/16/13 <0.50 0.42 0.20J NA I 0.71J 0.24J <0.50 0.24J <0.50 1.1 0.99J NA NA NA <0.25 0.55 2.6 0.80 NA 2.1 5-6 09/16/13 <0.23 <0.23 0.14J NA 0.38J <0.23 <0.23 <0.23 <0.23 <0.23 0.19J NA NA NA <0.23 0.51 1.5 0.72 NA 0.86J SB-10 2-3 09/16/13 <0.49 <0.49 0.98 NA 6.0 <0.49 <0.49 <0.49 <0.49 <0.49 1.77J NA NA NA <0.49 4.0 29 3.1 NA 11 3-4 09/16/13 <0.26 <0.26 0.091J NA 1.OJ <0.26 <0.26 <0.26 <0.26 <0.26 <0.78 NA NA NA <0.26 0.27 0.23J <0.26 NA 0.65J 1-2 09/16/13 <0.013 0.013 <0.013 NA <0.063 0.025 <0.013 <0.013 <0.01 0.005J <0.038 NA NA NA <0.013 <0.013 <0.013 <0.013 NA <0.063 SB-11 4-5 09/16/13 <0.0131 0.009J <0.013 NA <0.063 <0.0 131 <0.013 <0.0 131 <0.013 0.011J <0.038 NA NA NA <0.013 <0.013 <0.013 <0.013 NA <0.063 2-3 09/16/13 <0.013 <0.013 <0.013 NA 0.008J <0.013 <0.013 <0.013 <0.013 <0.013 <0.038 NA NA NA <0.013 <0.013 0.005J <0.013 NA 0.011J SB-12 3-4 09/16/13 <0.013 <0.013 <0.013 NA <0.066 <0.013 <0.013 <0.013 <0.013 <0.013 <0.040 NA NA NA <0.013 <0.013 <0.013 <0.013 NA <0.066 2-3 09/16/13 <0.011 <0.011 0.006J NA <0.053 0.090 <0.011 <0.011 <0.011 <0.011 0.068 NA NA NA <0.011 <0.011 <0.011 <0.011 NA <0.053 SB-13 3-4 09/16/13 <0.12 0.066J <0.12 NA <0.59 0.26 A.12 <0.12 <0.12 <0.12 <0.35 NA NA NA <0.12 <0.12 <0.12 <0.12 NA <0.59 SB-14 2-3 09/16/13 <0.12 <0.12 <0.12 NA <0.60 3.4 <0.12 <0.12 <0.12 <0.12 <0.36 NA NA NA <0.12 <0.12 <0.12 <0.12 NA <0.60 SB-15 2-3 09/17/13 <0.12 <0.12 <0.12 NA <0.61 3.6 <0.12 <0.12 0.075J <0.12 <0.37 NA NA NA <0.12 <0.12 <0.12 <0.12 NA <0.61 3-4 09/17/13 <0.13 <0.13 <0.13 NA <0.64 5.3 <0.13 <0.13 0.060J <0.13 <0.39 NA NA NA <0.13 <0.13 <0.13 <0.13 NA <0.64 SB-16 1-2 09/17/13 <0.013 0.083 <0.013 NA <0.64 0.40 <0.013 <0.013 0.073 <0.013 <0.039 NA NA NA <0.013 <0.013 <0.013 <0.013 NA <0.064 4-5 09/17/13 <0.52 0.35J <0.52 NA 0.17J 0.64 <0.52 <0.52 0.26J <0.52 <1.04 NA NA NA <0.52 <0.52 <0.52 <0.52 NA 0.37J 2-3 09/17/13 <0.52 4.6 <0.52 NA <2.6 220 <0.52 <0.52 13 <0.52 <1.52 NA NA NA <0.52 <0.52 <0.52 <0.52 NA <2.6 SB-17 3-4 09/17/13 <0.24 1.5 <0.24 NA <1.2 74 <0.24 <0.24 4.1 <0.24 <0.72 NA NA NA <0.24 <0.24 <0.24 <0.24 NA <1.2 Page 1 of 8 Table 1: Analytical Data for Soil DSCA ID No.: DC920048 N N b o y N A A W N N A ',T. i U O N M W m s w z H H F > >S a7 .L' U U 7 A [mg/kg] SB-18 2-3 09/17/13 <0.011 0.31 <0.011 NA <0.057 250 <0.011 0.005J 0.21 <0.011 <0.034 NA NA NA <0.011 <0.011 <0.011 <0.011 NA <0.057 4-5 09/17/13 <0.012 0.25 <0.012 NA <0.059 1.2 <0.012 0.009J 0.13 0.036 <0.035 NA NA NA <0.012 <0.012 <0.012 <0.012 NA <0.059 SB-19 0-1 09/18/13 <0.22 0.27 <0.22 NA 0.068J <0.22 <0.22 <0.22 <0.22 <0.22 0.078J NA NA NA <0.22 <0.22 0.14J <0.22 NA <l.l 3-4 09/18/13 <0.012 0.039 <0.012 NA <0.059 0.005J <0.012 <0.012 0.039 0.005J <0.036 NA NA NA <0.012 <0.012 <0.012 <0.012 NA <0.059 SB-20 1-2 09/18/13 <0.46 0.52 <0.46 NA <2.3 310 <0.46 <0.46 1.4 <0.46 <1.38 NA NA NA <0.46 <0.46 <0.46 <0.46 NA <2.3 3-4 09/18/13 <0.23 0.16J <0.23 NA <1.2 2.7 <0.23 <0.23 <0.23 <0.23 <0.69 NA NA NA <0.23 <0.23 <0.23 <0.23 NA <1.2 2-3 09/18/13 <0.51 4.9 <0.51 NA <2.6 0.44J <0.51 <0.51 <0.51 <0.51 <1.51 NA NA NA <0.51 <0.51 1.7 0.60 NA 0.18J SB-21 3-4 09/18/13 <1.2 10 0.45J NA 4.2J 0.95J <1.2 0.46J 0.73J <1.2 6.1 NA NA NA <1.2 3.0 100 49 NA 20 0-1 09/18/13 <0.012 0.15 <0.012 NA 0.005J 0.30 <0.012 0.073 0.11 0.058 0.022J NA NA NA <0.012 0.006J 0.18 0.089 NA 0.032J SB-22 3-4 09/18/13 <0.25 2.1 0.080J NA 0.29J <0.25 <0.25 0.23J <0.25 0.38 0.29J NA NA NA <0.25 0.22J 1.7 0.63 NA 0.25J 1-2 09/18/13 <0.24 5.1 <0.24 NA 0.098J <0.24 <0.24 0.55 <0.24 0.12J 0.78J NA NA NA <0.24 0.36 12 4.1 NA 2.7 SB-23 3-4 09/18/13 <0.53 0.71J <0.53 NA <2.6 <0.53 <0.53 <0.53 <0.53 <0.53 <1.63 NA NA NA <0.53 <0.53 0.32J <0.53 NA 0.181 2-3 09/18/13 <0.013 <0.013 <0.0131 NA 1 <0.065 <0.013 <0.013 <0.013 <0.013 <0.013 <0.039 NA NA I NA <0.013 <0.013 <0.013 <0.013 NA <0.065 SB-24 4-5 09/18/13 <0.013 <0.013 <0.013 NA <0.063 0.050 <0.013 <0.013 0.009J <0.013 <0.038 NA NA NA <0.013 <0.013 <0.013 <0.013 NA <0.063 2-3 09/18/13 <0.011 0.097 <0.011 NA <0.057 0.066 <0.011 0.007J 0.014 <0.011 <0.034 NA NA NA <0.011 <0.011 <0.011 <0.011 NA <0.057 SB-25 4-5 09/18/13 <0.012 0.042 <0.012 NA <0.060 0.15 <0.012 <0.012 0.021 <0.012 <0.036 NA NA NA <0.012 <0.012 <0.012 <0.012 NA <0.060 2-3 09/18/13 <0.011 <0.011 <0.011 NA <0.054 0.006J <0.011 <0.011 <0.011 <0.011 <0.032 NA NA NA <0.011 <0.011 <0.011 <0.011 NA <0.054 SB-26 4-5 09/18/13 <0.011 <0.011 <0.011 NA <0.055 <0.011 <0.011 <0.011 <0.011 <0.011 <0.033 NA NA NA <0.011 <0.011 <0.011 <0.011 NA <0.055 SB-27 0-1 09/18/13 <0.012 0.011J <0.012 NA <0.060 0.20 <0.012 <0.012 0.013 <0.012 <0.036 NA NA NA <0.012 <0.012 <0.012 <0.012 NA <0.060 4-5 09/18/13 <0.25 0.73 <0.25 NA <1.2 16 <0.25 <0.25 0.84 <0.25 <0.75 NA NA NA <0.25 <0.25 <0.25 <0.25 NA <1.2 1-2 09/18/13 <0.25 0.44 <0.25 NA <1.3 6.2 <0.25 <0.25 0.16J <0.25 <0.76 NA NA NA <0.25 <0.25 <0.25 <0.25 NA <1.3 SB-28 3-4 09/18/13 <0.013 0.024 <0.013 NA <0.063 0.41 <0.013 0.004J 0.021 <0.013 <0.038 NA NA NA <0.013 <0.013 <0.013 <0.013 NA <0.063 SB-29 0-1 09/20/13 <0.00206 <0.00206 <0.00206 <0.00206 <0.00516 0.0156 <0.00206 <0.00206 <0.00206 <0.00206 <0.00309 <0.0516 <0.00206 <0.00206 <0.00206 <0.00206 <0.00206 <0.00206 <0.0516 <0.00206 3-4 09/20/13 <0.00225 <0.00225 <0.00225 <0.00225 <0.338 0.139 <0.00225 <0.00225 <0.00225 <0.00225 <0.00338 <0.0564 <0.00225 <0.00225 <0.00225 <0.00225 <0.135 <0.135 <0.0564 <0.135 SB-30 0-1 02/16/17 <0.00173 0.0844 <0.00173 <0.00173 <0.00433 2.87 <0.00173 <0.00173 0.0870 <0.00173 <0.00520 <0.0433 <0.00173 <0.00173 <0.00173 <0.00173 <0.00173 <0.00173 <0.0433 <0.00173 7-8 02/16/17 <0.00171 18.2 0.290 <0.00171 0.0353 0.0371 0.0204 0.140 1.74 0.524 0.167 <0.0428 <0.00171 <0.00171 0.0200 6.15 0.231 0.0616 <0.0428 11.9 SB-31 0-1 02/17/17 <0.00230 9.69 <2.61 <0.00230 <6.52 10,000 <2.61 <2.61 97.1 <0.00230 <7.83 0.0820 <0.00230 0.163 <0.00230 <2.61 <2.61 <2.61 <65.2 3.86 2-3 02/17/17 <0.00198 23.4 0.00275 <0.00198 0.0369 2,250 0.00248 <2.65 49.9 0.00517 0.0182 0.0648 <o.00l98 0.170 <0.00198 0.00201 0.0149 0.0330 <0.0494 <0.00198 SB-32 0-1 02/17/17 <0.00186 1.47 <0.00186 <0.00186 <0.00464 26.6 <0.00186 <0.103 2.56 <0.00186 <0.00557 <0.0464 <0.00186 0.00667 <0.00186 <0.00186 <0.00186 <0.00186 <0.0464 <0.00186 2-3 02/17/17 1 <0.00223 36.1 <0.00223 <0.00223 <0.347 395 <0.00223 <2.78 62.3 10.00955 <0.00669 0.103 <0.00223 0.0609 1 <0.00223 <0.00223 0.201 <0.139 <0.0558 <0.139 SB-33 0- 1 02/17/17 <0.00189 0.0921 <0.00189 <0.00189 <0.00473 14.4 <0.00189 0.00224 0.241 <0.00189 <0.00567 0.0793 <0.00189 <0.00389 <0.00189 <0.00189 <0.00189 <0.00189 <0.0473 <0.00F189 2-3 02/17/17 <0.00185 0.0915 <0.00185 <0.0018s <0.00462 9.76 <0.00185 0.00210 0.327 <0.00185 <0.00555 0.101 <0.0018s <0.0018s <0.0018s <0.0018s <0.0018s <0.00185 <0.0462 <0.00185 Page 2 of 8 Table 1: Analytical Data for Soil DSCA ID No.: DC920048 N N 75 Ga N U A aNN A r ° o W N N A N M W U rii A [mg/kg] SB-34 0-1 02/17/17 <0.00213 0.00852 <0.00213 <0.00213 <0.00533 0.310 <0.00213 <0.00213 0.0137 <0.00213 <0.00639 <0.0533 <0.00213 <0.00213 <0.00213 <0.00213 <0.00213 <0.00213 <0.0533 <0.00213 1-2 02/17/17 <0.00200 0.0365 <0.00200 <0.00200 <0.00499 21.3 <0.00200 0.00213 0.101 <0.00200 <0.00599 <0.0499 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200 <0.0499 <0.00200 SB-35 0-1 02/16/17 <0.00222 0.00793 <0.00222 <0.00222 <0.00554 0.0914 <0.00222 <0.00222 0.00577 <0.00222 <0.00665 <0.0554 <0.00222 <0.00222 <0.00222 <0.00222 <0.00222 <0.00222 <0.0554 <0.00222 2-3 02/16/17 <0.00217 0.119 <0.00217 <0.00217 <0.280 31.4 <0.00217 0.00315 0.138 <0.00217 <0.00651 <0.0543 <0.00217 <0.00217 <0.00217 <0.00217 <0.112 <0.112 <0.0543 <0.112 SB-36 0-1 02/16/17 <0.00203 0.0119 <0.00203 <0.00203 <0.00507 0.212 B <0.00203 <0.00203 0.0128 <0.00203 <0.00608 <0.0507 <0.00203 <0.00203 <0.00203 <0.00203 <0.00203 <0.00203 <0.0507 <0.00203 3-4 02/16/17 <0.00174 0.0189 <0.00174 <0.00174 <0.00436 3.08 <0.00174 <0.00174 0.0454 <0.00174 <0.00523 0.0550 <0.00174 <0.00174 <0.00174 <0.00174 <0.00174 <0.00174 <0.0436 <0.00174 SB-37 0-1 02/16/17 <0.00227 0.00467 <0.00227 <0.00227 <0.372 11.7 <0.00227 <0.00227 0.00388 <0.00227 <0.00682 0.129 <0.00227 <0.00227 <0.00227 <0.00227 <0.149 <0.149 <0.0568 <0.149 9-10 02/16/17 <0.00230 0.0601 <0.00230 <0.00230 <0.00576 0.354 B <0.00230 <0.00230 0.168 <0.00230 <0.00691 <0.0576 <0.00230 <0.00230 <0.00230 <0.00230 <0.00230 <0.00230 <0.0576 <0.00230 SB-38 0-1 02/16/17 <0.00205 0.105 <0.00205 <0.00205 <0.297 19.6 <0.00205 0.00372 0.0358 <0.00205 <0.00614 0.0860 <0.00205 <0.00205 <0.00205 <0.00205 <0.119 <0.119 <0.0512 <0.119 9-10 02/16/17 <0.00219 0.335 <0.00219 <0.00219 <0.00547 10.1 <0.00219 0.00288 3.30 <0.00219 <0.00656 <0.0547 <0.00219 <0.00219 <0.00219 <0.00219 <0.00219 <0.00219 <0.0547 <0.00219 SB-39 0-1 02/16/17 0.00217 3.52 <1.07 <0.00173 <2.68 890 <1.07 <1.07 4.49 0.00406 <3.21 0.262 <0.00173 0.00674 <0.00173 <1.07 1 <1.07 <1.07 <26.8 <1.07 3-4 02/16/17 0.00161 1.28 E <1.88 <0.00160 <4.71 4,250 <1.88 0.0605 8.02 <0.00160 <5.65 0.0599 <0.00160 0.00719 <0.00160 <1.88 <1.88 <1.88 <47.1 <1.88 SB-40 0-1 02/16/17 <0.136 10.2 <0.136 <0.136 <0.339 566 <0.136 1.29 12.8 <0.136 <0.407 <3.39 <0.136 0.526 <0.136 <0.136 <0.136 <0.136 <3.39 <0.136 9-10 02/16/17 0.00267 2.55 E <2.70 <0.00212 <6.74 12,900 <2.70 0.231 16.9 <0.00212 <8.09 0.0839 <0.00212 0.00403 0.0558 <2.70 <2.70 <2.70 <67.4 <2.70 2-3 09/20/13 <0.00185 <0.00185 <0.00185 <0.00185 <0.00462 0.00966 <0.00185 <0.00185 <0.00185 <0.00185 <0.00277 0.0677 <0.00185 <0.00185 <0.00185 <0.00185 <0.00185 <0.00185 <0.0462 <0.00185 SGMP-1 4-5 09/20/13 <0.00159 <0.00159 <0.00159 <0.00159 <0.00398 0.846 <0.00159 <0.00159 0.0102 <0.00159 <0.00239 0.0551 <0.00159 <0.00159 <0.00159 <0.00159 <0.00159 <0.00159 <0.0398 <0.00159 SGMP-3 1-2 09/20/13 <0.00160 <0.00160 <0.00160 <0.00160 <0.00400 0.00509 <0.00160 <0.00160 <0.00160 <0.00160 <0.00240 <0.0400 <0.00160 <0.00160 <0.00160 <0.00160 <0.00160 <0.00160 <0.0400 <0.00160 3-4 09/20/13 <0.00159 <0.00159 <0.00159 <0.00159 <0.00397 0.0252 <0.00159 <0.00159 <0.00159 <0.00159 <0.00238 0.0545 <0.00159 <0.00159 <0.00159 <0.00159 <0.00159 <0.00159 <0.0397 <0.00159 SGMP-6 2-3 09/20/13 <0.00182 0.0287 <0.00182 <0.00182 <0.00454 0.00333 <0.00182 0.00544 0.00954 0.119 <0.00273 <0.0454 <0.00182 <0.00182 <0.00182 <0.00182 0.0115 0.00349 <0.0454 <0.00182 3-4 09/20/13 <0.00163 0.0101 <0.00163 <0.00163 <0.00407 0.0129 <0.00163 <0.00163 0.00788 0.0427 0.00306 <0.0407 <0.00163 <0.00163 <0.00163 0.00231 0.0191 0.00836 <0.0407 0.00634 Backfill -- 10/20/17 <0.0020 <0.0020 0.002 <0.0020 <0.0040 <0.18 <0.0020 <0.0020 <0.0020 <0.0020 <0.010 <0.10 <0.010 <0.0040 <0.0040 <0.0020 <0.0020 <0.0020 <0.020 <0.0020 Excavation-1 3 10/20/17 <0.051 4.6 0.059 0.059 <0.051 0.22 2.9 0.0091 J 0.19 0.28 0.054J <2.5 <0.25 <0.10 <0.051 0.27 1.5 0.46 <0.51 0.33 Excavation-2 3 10/20/17 <0.25 <0.25 0.22 J 0.22 J <0.25 2.9 <0.25 0.050 J <0.25 <0.25 <0.50 <13 <1.3 <0.50 <0.25 0.55 11 5.8 <2.5 1.7 Excavation-3 3 10/20/17 <0.0020 <0.0020 0.0012 J 0.0012 J <0.0039 0.16 J <0.0020 <0.0020 <0.0020 <0.0020 <0.0098 <0.098 <0.0098 <0.0039 <0.0039 0.0038 0.0062 0.00061 J <0.020 0.014 Excavation-4 3 10/20/17 <0.20 0.39 0.48 0.48 <0.20 1.2 <0.20 <0.20 0.055 J <0.20 0.098J <9.8 <0.98 <0.39 <0.20 1.3 0.33 0.088 J <2.0 2.3 Excavation-5 6 10/20/17 <0.00094 <0.00094 0.0061 0.0061 <0.00094 1.9 <0.00094 <0.00094 <0.00094 <0.00094 <0.0019 <0.047 <0.0047 <0.0019 <0.00094 0.014 0.01 0.00039 J <0.0094 0.029 Closure-1 6 10/20/17 NA NA NA NA NA NA NA NA NA NA NA NA NA I NA NA NA NA NA NA NA Closure-2 6 1 10/20/17 NA NA NA NA NA NA NA NA NA NA NA NA Nth NA NA NA NA NA Nip NA Unrestriced Use PSRG 1.20 31.0 6.1 49 4.10 17 820 310 0.87 0.0610 120 12000 1.4 0.34 48 270 63 56 3400 110 Protection of Groundwater PSRG 0.01 0.41 1 13 1 0.09 1 0.39 10.00631 8.3 0.62 0.021 10.000211 9.9 1 42 0.05 0.39 2.5 2.3 12 1 11 0.45 1 4.5 Page 3 of 8 Table 1: Analytical Data for Soil DSCA ID No.: DC920048 N N b 3 75 o y aNN o N N A A t W N A M W W Z F F W U U N [mg/kg] Notes: 1. PSRGs are the Inactive Hazardous Sites Branch Preliminary Soil Remediation Goals dated October 2017. 2. Bold concentrations exceed the lower of the Unrestricted Use Health -Based PSRG or the Protection of Groundwater PSRG. 3. J = estimated concentration between laboratory reporting limit and method detection limit. 4. NA = not analyzed, NE = not established Page 4 of 8 Table 1(1): Analytical Data for Soil (User Specified Chemicals) DSCA ID No.: DC920048 � U N p lot o >. iC iC U ti V 'A V 4 bq eu i. ° N � o a�i T� a a �'' o a a U U U U Q o A r L ¢ 7 7 V O A x W U U O N 00 C V A! on ° o W Pa A o Y A r, U Ol U Ol U Ql o ro a C a ° � N �.. p G' A. vOi .�.. U �..i N N W U U U U U W Pr Q G c7 A [mg/kg] 1-2 02/07/13 <0.00185 <0.00185 <0.00185 <0.00185 <0.00185 <0.00185 <0.0463 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SB-1 6-7 02/07/13 <0.00201 <0.00201 <0.00201 <0.00201 <0.00201 <0.00201 <0.0502 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 1-2 02/07/13 40.7 50.9 37.8 17.7 <0.116 <0.00184 <0.0460 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SB-2 6-7 02/07/13 20.6 2.42 12.9 4.66 <0.149 <0.00204 <0.0510 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SB-3 1-2 02/07/13 <0.00199 0.00297 0.00344 <0.00199 <0.00199 <0.00199 <0.0497 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 6-7 02/07/13 <0.00196 <0.00196 <0.00196 <0.00196 <0.00196 <0.00196 <0.04891 NA I NA NA I NA NA NA NA NA NA NA NA NA NA NA NA NA SB-4 1-2 02/07/13 <0.00190 <0.00190 <0.00190 <0.00190 <0.00190 <0.00190 <0.0475 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 5-6 02/07/13 0.311 0.407 0.381 1.04 <0.246 <0.00194 <0.0484 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SB-5 1-2 02/07/13 <0.00229 <0.00229 <0.00229 <0.00229 <0.00229 <0.00229 <0.0572 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 5-6 02/07/13 2.57 0.334 3.16 1.05 <0.113 <0.00185 <0.0462 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SB-6 1-2 02/07/13 <0.00173 <0.00173 <0.00173 <0.00173 <0.00173 <0.00173 <0.0432 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 5-6 02/07/13 <0.00219 <0.00219 <0.00219 <0.00219 <0.00219 <0.00219 <0.05471 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SB-7 2-3 09/16/13 0.025 <0.012 0.052 0.052 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 5-6 09/16/13 0.34 <0.013 0.27 0.11 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SB-8 2-3 09/16/13 1.9 0.43 2.2 1.2 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 5-6 09/16/13 16 <0.49 14 6.6 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SB-9 2-3 09/16/13 LO 2.6 1.5 1.0 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 5-6 09/16/13 1.1 0.31 0.88 0.29 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SB-10 2-3 09/16/13 8.2 13 8.4 2.6 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 3-4 09/16/13 0.65 0.091J 0.55 0.16J NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 1-2 09/16/13 <0.013 <0.013 <0.013 <0.013 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SB-11 4-5 09/16/13 <0.013 <0.013 0.006J 0.005J NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 2-3 09/16/13 0.005J 0.022 0.010J 0.013 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SB-12 34 09/16/13 <0.013 <0.013 <0.013 <0.013 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 2-3 09/16/13 <0.011 <0.011 <0.011 <0.011 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SB-13 34 09/16/13 <0.12 <0.12 <0.12 <0.12 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SB-14 2-3 09/16/13 <0.12 <0.12 <0.12 <0.12 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SB-15 2-3 09/17/13 <0.12 <0.12 <0.12 <0.12 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 3-4 09/17/13 <0.13 <0.13 <0.13 <0.13 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 1-2 09/17/13 <0.013 <0.013 <0.013 <0.013 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SB-16 4-5 09/17/13 0.23J 0.16J 0.51J 0.37J NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SB-17 2-3 09/17/13 1 <0.52 <0.52 <0.52 <0.52 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 3-4 09/17/13 1 <0.24 <0.24 <0.24 <0.24 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Page 5 of 8 Page 6 of 8 Table 1(1): Analytical Data for Soil (User Specified Chemicals) DSCA ID No.: DC920048 � U ar N p lot o >. iC iC a U V U V eu i. c a a o ? E a a U U U on A CL ¢ 7 7 V O A W U U O N 00 C = r U U U o ro E a a Ol Ol Ql �' Q G C c7 N C 2, vOi .�.. U . �..i N N W U U U U U W Pr A [mg/kg] SB-34 0-1 02/17/17 <0.00213 <0.00213 <0.00213 <0.00213 <0.00213 <0.00213 <0.0533 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 1-2 02/17/17 10.00200 <0.00200 <0.00200 <0.00200 <0.00200 <0.00200 <0.0499 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SB-35 0-1 02/16/17 <0.00222 <0.00222 <0.00222 <0.00222 <0.00222 <0.00222 <0.0554 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 2-3 02/16/17 <0.112 <0.112 <0.112 <0.112 <0.112 <0.00217 <0.0543 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SB-36 0-1 02/16/17 <0.00203 <0.00203 <0.00203 <0.00203 <0.00203 <0.00203 <0.0507 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 3-4 02/16/17 <0.00174 <0.00174 <0.00174 <0.00174 <0.00174 <0.00174 <0.04361 NA I NA NA I NA NA NA NA NA NA NA NA NA NA NA NA NA SB-37 0-1 02/16/17 <0.149 <0.149 <0.149 <0.149 <0.149 <0.00227 <0.0568 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 9-10 02/16/17 <0.00230 <0.00230 <0.00230 <0.00230 <0.00230 <0.00230 <0.0576 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SB-38 0-1 02/16/17 <0.119 <0.119 <0.119 <0.119 <0.119 <0.00205 <0.0512 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 9-10 02/16/17 <0.00219 <0.00219 <0.00219 <0.00219 <0.00219 <0.00219 <0.0547 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 0-1 02/16/17 <1.07 <1.07 <1.07 <1.07 <1.07 <1.07 0.0612 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SB-39 3-4 02/16/17 <1.88 <1.88 <1.88 <1.88 <1.88 <1.88 <0.0401 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SB-40 0-1 02/16/17 <0.136 <0.136 <0.136 <0.136 <0.136 <0.136 <3.39 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 9-10 02/16/17 <2.70 <2.70 <2.70 <2.70 <2.70 <2.70 <0.0529 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 2-3 09/20/13 <0.00185 <0.00185 <0.00185 <0.00185 <0.00185 <0.00185 <0.0462 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SGMP-1 4-5 09/20/13 <0.00159 <0.00159 <0.00159 <0.00159 <0.00159 <0.00159 <0.0398 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SGMP-3 1-2 09/20/13 <0.00160 <0.00160 <0.00160 <0.00160 <0.00160 <0.00160 <0.0400 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 3-4 09/20/13 <0.00159 <0.00159 <0.00159 <0.00159 <0.00159 <0.00159 <0.03971 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA SGMP-6 2-3 09/20/13 <0.00182 0.00382 0.00968 0.0156 <0.00182 <0.00182 <0.0454 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 3-4 09/20/13 0.00424 0.00275 0.0165 0.0178 <0.00163 <0.00163 <0.0407 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA Backfill -- 10/20/17 <0.0020 <0.0020 <0.0020 <0.0020 <0.37 <0.0020 <0.040 <0.18 <0.37 <0.18 <0.37 NA NA NA NA NA <0.18 <0.18 NA NA NA NA NA Excavation-1 3 10/20/17 0.75 0.12 0.33 0.099 <0.051 <0.051 <1.0 <0.20 <0.40 <0.20 <0.40 <12 <12 18 18 32 <0.20 <0.20 <12 <11 36 NA NA Excavation-2 3 10/20/17 1.9 1.6 1.4 0.61 <0.45 <0.25 <5.0 0.15J <0.45 0.26 0.53 17 21 760 1400 910 <0.23 <0.23 19 <290 2200 NA NA Excavation-3 3 10/20/17 0.01 0.0036 0.0075 0.0022 <0.0020 <0.0020 <0.039 <0.21 <0.41 0.080 J <0.41 <12 <12 16 16 18 <0.21 <0.21 <12 <12 32 NA NA Excavation4 3 10/20/17 3.2 0.10 J 1.9 0.7 <0.42 <0.20 <3.9 0.13 J 0.14 J 0.21 J <0.42 21 24 440 610 340 0.11 J 0.085 J 22 <160 1100 NA NA Excavation-5 6 10/20/17 0.039 0.013 0.021 0.0057 <0.43 <0.00094 <0.019 0.21 J <0.43 0.42 <0.43 <13 <13 900 1300 510 <0.22 <0.22 <13 <240 2200 NA NA Closure-1 6 10/20/17 NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA NA 4400 2400 Closure-2 6 10/20/17 NA NA NA NA NA NA NA NA NAI NA NA NA NA NA NA NA NA NA NA NA NA 30 56 Unrestriced Use PSRG NE NE 110 180 380 58 5500 18 250 48 39 510 0.34 17 110 69 480 360 NE NE NE NE NE Protection of Groundwater PSRG NE 1.24 4.5 3.1 0.39 0.68 17 0.11 2.4 3.1 14 NE NE NE NE NE 670 440 NE NE NE NE NE Page 7 of 8 Table 1(1): Analytical Data for Soil (User Specified Chemicals) DSCA ID No.: DC920048 � U N o p lot eu >. iC iC a U ti V U V 4 bq i. ° � � o a�i T� a a a � ° � �'' o a a � U U U U Q o A r-i x N 00 C V A!i v on ° o W Pa A o Y A r, U Ol U Ol U Ql o ro a C a ° � N U �..� N N W U U U U U W Pr Q G d c7 CJ A AI [mg/kg] Notes: 1. PSRGs are the Inactive Hazardous Sites Branch Preliminary Soil Remediation Goals dated October 2017. 2. Bold concentrations exceed the lower of the Unrestricted Use Health -Based PSRG or the Protection of Groundwater PSRG. 3. J = estimated concentration between laboratory reporting limit and method detection limit. 4. NA = not analyzed, NE = not established Page 8 of 8 Figures 14 hart hickman SMARTER ENVIRONMENTAL SOLUTIONS - — �A•a• t" I � � � I ��acr- l � � �rY� I pl 6u �h S ram• • r .F.m•)dir ]Ii�, icK' .- [R r_ -rbr. +.•wu�� ' •:•` 2.9a)NIS � RA I t.% .�"T � L I � •t APPROXIMATE TITLE SITE LOCATION MAP N 0 2000 4000 PROJECT ROLLINS ECONOMY CLEANERS SCALE IN FEET DSCA ID: DC920048 407 W. PEACE STREET U.S.G.S. QUADRANGLE MAP RALEIGH, WAKE COUNTY hart h i c k m a n 2923 South Tryon Street -Suite 100 RALEIGH WEST, NC 1988 04-586--0 07r� 704-586--0Carolina 3703 SMARTER ENVIRONMENTAL SOLUTIONS �) (� QUADRANGLE DATE: 10/19/18 REVISION NO: 0 7.5 MINUTE SERIES (TOPOGRAPHIC) JOB NO: DSO-79 FIGURE NO: 1 FST A / I \ / I / FORMER / SHOE / REPAIR I FORMER FURNITURE / FORMER I SALES / ROLLINS I ECONOMY I FORMER CAR WASH CLEANERS (NO LONGER PRESENT) / I / I �v / / / / / / VACANT OFFICE LEGEND — — — SOURCE PROPERTY BOUNDARY PROPERTY PARCEL APPROXIMATE EXTENTS OF FORMER UST EXCAVATION / / 1 FORMER 1 BOILER 1 ROOM ' 1 1 ASPHALT/GRAVEL / / 0 TITLE 1 1 o FORMER OFFICE 9 APPROXIMATE 20 40 SCALE IN FEET SITE MAP PROJECT ROLLINS ECONOMY CLEANERS DSCA ID: DC920048 407 W. PEACE STREET RALEIGH, WAKE COUNTY 2923 South 7'r}on Street -Suite 100 hart hickman Charlotte, North Carolina 28203 704-586-0007(p) 704-586-0373(o SMARTER ENVIRONMENTAL SOLUTIONS License # C-1269 / #C-245 Gcolou NOTES- 1. BASE MAP DATA FROM WAKE COUNTY GIS. 2. STORM SEWER LOCATIONS FROM WAKE COUNTY GIS. DATE: 10-19-18 JOB NO. DSO-79 av6y[9P►■,64Mwe] FIGURE NO. 2 CAR WASH •SGMP-6 S B-23 • Excavation A SB 7 SB SB-22 • SB-90 ' - _ SB-2 SB-1 �• SB-12 - \ I VACANT OFFICE LEGEND SOURCE PROPERTY BOUNDARY — - - PROPERTY PARCEL • SOIL SAMPLE LOCATION 0.23 PCE ISOCONTOUR LINE IN mg/kg (DASHED WHERE INFERRED) 02 170 mg/kg PCE TREATMENT AREA SB-19• �FSTA FgCFSTRFFT • SB-1 • SB-29 ROLLINS ECONOMY CLEANERS •SB-36 0SB-27 ?. B-34 • SB-6 •SB-15 3-3 SB- 4• 3• \� SB-37• SHOE REPAIR / FURNITURE / SALES Lion B \ \ • SIB-28 \ • SB-21 13-25 I xcavation C Nti ry• / / • SGMP-1 / OFFICE •S • SGMP-3 APPROXIMATE 0 20 40 I SCALE IN FEET PROPOSED SOIL INTERIM ACTION AREAS (SURFICIAL SOIL, <3 FT BGS) ROLLINS ECONOMY CLEANERS DSCA ID: DC920048 407 W. PEACE ST. RALEIGH, WAKE COUNTY • • 2923 South Tryon Street -Suite 100 had hackman Charlotte, North Carolina 28203 704-586-0007(p) 704-586-0373(f 51AAR19t BlYR01�BIdL 50ll11101L9 License # C-1269 / #C-245 Geology DATE: 3-17-17 REVISION NO. 0 JOB NO. DSO-79 FIGURE NO. 3 �FSTA FgCFSTRFFT SB-1� / p 023 TSB-29 ECONOMY CAR CLEANERS WASH •SGMP-6 TSB-36 •SB-27 \ I • .fil��i!i�i?. SB-230 \ S B-7 • SB-8/SB-22 0 SB-9• 2,300 SB-2• \ / /230 SB-4 SB-10� , SB-11� SB-120 SB-190 VACANT OFFICE LEGEND SOURCE PROPERTY BOUNDARY PROPERTY PARCEL SOIL SAMPLE LOCATION 0.23- PCE ISOCONTOUR LINE IN mg/kg (DASHED WHERE INFERRED) 170 mg/kg PCE TREATMENT AREA 14* TSB-15 SB-37 SB-21 B SB-28 SHOE REPAIFjt/ // FURNITURE SALES B 25 Excavation C I SGMP-1 240 / OFFICE 8 APPROXIMATE 0 20 40 SCALE IN FEET ME PROPOSED SOIL INTERIM ACTION AREAS (SUBSURFACE SOIL, >3 FT BGS) PROJECT ROLLINS ECONOMY CLEANERS DSCA ID: DC920048 407 W. PEACE ST. RALEIGH, WAKE COUNTY • • 2923 South Tryon Street -Suite 100 had hackman Charlotte, North Carolina 28203 704-586-0007(p) 704-586-0373(f 51AAR19t BlYR01�BIdL 50ll11101L9 License # C-1269 / #C-245 Geolc DATE: 3-24-17 REVISION NO. 0 JOB NO. DSO-79 FIGURE NO. 4 Appendix A Site Photographs hart hickman SMARTER ENVIRONMENTAL SOLUTIONS rn 0 co 0 Photograph 1: View of southeastern portion of source property facing northwest Photograph 2: View of southern portion of source property facing north ROLLINS ECONOMY CLEANERS 2923 S. Tryon Street, Suite 100 DSCA ID NO: DC940048 hart '%• hickman Charlotte, NC 28203 407 W. PEACE STREET 704.586.0007(p) 704.586.0373(f) RALEIGH, WAKE COUNTY rn r; 0 0 Photograph 3: View of southwestern portion of source property building facing north (Excavation Area A) Photograph 4: View of southcentral portion of source property building facing northeast (Excavation Area B) ROLLINS ECONOMY CLEANERS 2923 S. Tryon Street, Suite 100 DSCA ID NO: DC940048 hart '%• hickman Charlotte, NC28203 407 W. PEACE STREET W 704.586.0007(p) 704.586.0373(f) RALEIGH, WAKE COUNTY rn 0 U) 0 Photograph 5: View of southcentral portion of source property building facing northwest (Excavation Area B) Photograph 6: View of area southeast of source property building facing northwest (Excavation Area Q ROLLINS ECONOMY CLEANERS 2923 S. Tryon Street, Suite 100 DSCA ID NO: DC940048 hart 0`0hickman Charlotte, NC 28203 407 W. PEACE STREET 0- 704.586.0007(p) 704.586.0373(f) RALEIGH, WAKE COUNTY