E N V I R O N M E N T A L I N C O R P O R A T E D

Transcription

1 H P E N V I R O N M E N T A L I N C O R P O R A T E D April 10, 2015 Ms. Lisa Wiersma Development Manager Vornado/Charles E. Smith 2345 Crystal Drive Suite 1100 Arlington Virginia Re: Limited Phase II Environmental Site Assessment RiverHouse Apartments 1400 & 1600 S. Joyce Street and 1111 Army-Navy Drive Arlington, Virginia Dear Ms. Wiersma: At the request of Vornado/Charles E. Smith (Vornado), HP Environmental, Inc. (HPE) has completed a limited Phase II Environmental Site Assessment (Phase II) of the referenced property in accordance with our proposals dated November 24, 2014 and February 7, Background The RiverHouse site encompasses 35.8 acres of land that is currently developed with a large apartment complex, associated grounds and support structures. Vornado has proposed additional infill development at the site to include three new apartment buildings with associated below-grade parking structures. The depth of the proposed structures ranges from two to four stories below grade. A generalized sketch showing the location of the panned infill development is shown on Figure 1. Mass excavation of portions of the site will be required for the planned development. Vornado retained HPE to assess the possibility that petroleum-contaminated soil may be present beneath the site in areas that will be excavated in the future. The presence of such contamination could increase the development costs. As such Vornado tasked HPE with assessing the presence, extent, and severity of petroleum contaminated soil within the planned footprints for the new structures.

2 Ms. Lisa Wiersma April 10, 2015 Page 2 of 4 Scope of Work HPE s scope of work for the Phase II included two separate phases; one performed in conjunction with the completion of geotechnical borings by others and one in conjunction with the completion of Geoprobe borings by HPE. During December of 2104 HPE was on site during the performance of a geotechnical investigation by ECS Mid-Atlantic, LLC (ECS) that included the completion of several soil borings by hollowstem auger methodology. Soil samples were collected by split-spoon sampler at specified intervals. A portion of the recovered soil sample was retained by others for geotechnical analysis. If sufficient soil remained in the sampler HPE collected a soil sample for environmental assessment. The assessment included field screening of available soil samples for the presence of volatile organic compounds (VOCs) such as those typically associated with petroleum fuels. Field screening was conducted using a calibrated Minirae photoionization detector (PID) equipped with a 10.6 electron volt lamp. The PID was calibrated prior to initiation of field activities and checked periodically in accordance with the manufacturer s specifications. The PID measures relative concentrations of total VOCs in the headspace of the sealed soil sample and reports the concentration in parts per million (ppm) up to a maximum concentration of 9,999 ppm. During this investigation, levels of VOCs documented were from background to a maximum of 41.3 ppm. The second phase of HPE s assessment was completed in February 2015 using Geoprobe drilling methodology. HPE completed an additional 16 borings in an effort to confirm the results of the prior sample collection event and in an effort to bound any contamination to allow for the calculation of potentially impacted soil volumes. The Geoprobe soil borings were completed using a five-foot-long, hardened-steel, Geoprobe soil sampler attached to five-foot sections of two-inch diameter, steel probe rod. The sampler and probe rods were advanced into the subsurface using a track-mounted, hydraulic Geoprobe rig. Soil samples were collected continuously from the ground surface to the bottom of each boring as part of this investigation. During the completion of each boring, a portion of each soil sample was containerized in a pre-cleaned, fourounce glass jar and placed on ice for possible laboratory analysis. The remainder of each sample was placed in a sealable plastic bag, and, after allowing sufficient time for evaporation of fluids, field screened for volatile organic compounds (VOCs) such as those typically associated with petroleum fuels. As with the initial portion of this assessment, field screening was conducted using a calibrated Minirae (PID) equipped with a 10.6 electron volt lamp. During this investigation, levels of VOCs documented were from background to a maximum of 1.4 ppm. During the geotechnical portion of the site assessment, each split-spoon sampler was bucket washed using a non-phosphate soap solution. The augers themselves were not decontaminated between uses. For the Geoprobe portion of the assessment, all contact sampling equipment was decontaminated prior to probing and between each boring location using a non-phosphate soap solution and then rinsed with deionized water. In addition, polyvinyl chloride (PVC) gloves were worn during all phases of

3 Ms. Lisa Wiersma April 10, 2015 Page 3 of 4 drilling and changed between each sampling event. A log of each soil boring was maintained in the field to characterize the types of soils, presence of moisture, and any unusual features or odors. These soil boring logs are included as Attachment 1. Two soil samples from each boring, where available, were selected for laboratory analysis. The selected samples were submitted to HPE s laboratory in Herndon, Virginia, for analysis of benzene, toluene, ethyl benzene and total xylenes (BTEX), naphthalene, and methyl tert butyl ether (MTBE) by U.S. Environmental Protection Agency (EPA) Method 8260 and total petroleum hydrocarbons, diesel range organics (TPH-DRO) by EPA Method Samples were maintained using strict chain-ofcustody procedures. Analytical results are presented in Table 1 and indicate that petroleum hydrocarbons were detected in six (6) of the78 soil samples. Analytical data sheets and a chain of custody form are included in Attachment 2. The extent and severity of the petroleum contamination in soil is discussed below. Discussion of Analytical Detections As can be seen from Table 1, six (6) of the78 soil samples submitted for laboratory analysis had detectable concentrations of petroleum hydrocarbons above the method reporting limits. All of the detections were from the geotechnical portion of the assessment. Additionally, all of the analytical detections are low and are not sufficiently elevated to require notification to the Virginia Department of Environmental Quality (DEQ). There is no discernible pattern to the analytical detections found during the geotechnical portion of the investigation. The Geoprobe sample locations were placed in such a fashion as to further assess the extent ad severity of the prior detections. No analytical detections were documented during the Geoprobe phase of the investigation even though samples were collected in similar locations and depths to those that had positive detections during the geotechnical phase of the investigation. There are two possibilities to explain the pattern of analytical detections encountered as follows: 1) The detections are legitimate and represent sporadic low to very low petroleum hydrocarbon concentrations in soil at the site. This is possible as the geology of the site as documented through lithologic evaluation of the recovered soil samples, indicates a complex mélange of sediments deposited in a fluvial environment. There was little connection or continuity of lithologic unit from boring to boring, at least in the upper 20 feet. This geologic environment when combined with a groundwater table contaminated with low-levels of petroleum hydrocarbons could produce the pattern of contamination documented as a part of this investigation. 2) The low-level detections from the geotechnical portion of the investigation are the results of contamination of the sampling equipment, with transfer to the soil samples, from diesel fuel, lubricating oils, and/or greases from the drill rig. All

4 Ms. Lisa Wiersma April 10, 2015 Page 4 of 4 split-spoon samplers were bucket washed prior to and between each sampling event but it is possible that the level of care associated with the decontamination effort was lower during the geotechnical portion of the investigation as opposed to during the Geoprobe portion of the investigation. This lower standard of care could have led to random and sporadic pattern of analytical detections as was documented during the investigation. Thank you for the opportunity to have provided these services. If you have any questions regarding this correspondence or cost estimates, please feel free to contact me at Sincerely, Kent D. Campbell Director, Site Assessment, Monitoring & Compliance

5 FIGURES AND TABLE

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7 Soil Sample Analytical Results RiverHouse Apartment Arlington, Virginia December February 2015 Sample # B-1 B-1 B-1A B-1B B-1C B-1D B-2 B-2 B-3 B-3 B-4 B-4 B-4A Sample Depth 9-10' 35-36' 9-10' 9-10' 9-10' 13-15' 9-10' 29-30' 29-30' 39-40' 5-6' 19-20' 6-8' Date 12/18/ /18/2014 2/11/2015 2/11/2015 2/11/2015 2/11/ /11/ /11/ /8/ /8/ /17/ /17/2014 2/11/2015 Analyte Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration TPH-DRO 71 ppm ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) 8.5 ppm ND (< 10 ppm) ND (< 10 ppm) Benzene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) Toluene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) Ethylbenzene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) m,p-xylene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) o-xylene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) MBTE ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) Naphthalene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) * ppb -parts per billion ** ppm -parts per million Soil Sample Analytical Results RiverHouse Apartment Arlington, Virginia December February 2015 Sample # B-4B B-4C B-5 B-5 B-6 B-6 B-7 B-7 B-7A B-8 B-8 B-9 B-9 Sample Depth 9-10' 13-14' 9-10' 12-13' 15-16' 29-30' 9-10' 25-26' 14-15' 5-6' 24-25' 14-15' 35-36' Date 2/11/2015 2/11/2015 2/11/2015 2/11/ /18/ /18/ /18/ /18/2014 2/11/ /17/ /17/ /15/ /15/2014 Analyte Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration TPH-DRO ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) Benzene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) Toluene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) Ethylbenzene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) m,p-xylene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) o-xylene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) MBTE ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) 33 ppb ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) Naphthalene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) * ppb -parts per billion ** ppm -parts per million

8 Soil Sample Analytical Results RiverHouse Apartment Arlington, Virginia December February 2015 Sample # B-10 B-10 B-11 B-11 B-12 B-12 B-13 B-13 B-14 B-14 B-15 B-15 B-16 Sample Depth 9-10' 17-18' 3-4' 15-16' 15-16' 29-30' 7-8' 27-28' 9-10' 29-30' 5-6' 19-20' 14-15' Date 12/5/ /5/ /17/ /17/ /15/ /15/ /5/ /5/ /22/ /22/ /19/ /19/ /8/2014 Analyte Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration TPH-DRO ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) 91 ppm ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) Benzene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) Toluene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) Ethylbenzene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) m,p-xylene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) o-xylene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) MBTE ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) 8.4 ppb ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) Naphthalene 1.5 ppb ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) * ppb -parts per billion ** ppm -parts per million Soil Sample Analytical Results RiverHouse Apartment Arlington, Virginia December February 2015 Sample # B-16 B-17 B-17 B-18 B-18 B-19 B-19 B-20 B-20 B-21 B-21 B-22 B-22 Sample Depth 29-30' 3-4' 9-10' 39-40' 9-10' 9-10' 19-20' 9-10' 19-20' 15-16' 25-26' 1-2' 19-20' Date 12/8/ /10/ /10/ /10/ /10/ /22/ /22/ /22/ /22/ /22/ /22/ /22/ /22/2014 Analyte Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration TPH-DRO ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) 8.4 ppm ND (< 10 ppm) Benzene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) Toluene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) Ethylbenzene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) m,p-xylene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) o-xylene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) MBTE ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) Naphthalene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) * ppb -parts per billion ** ppm -parts per million

9 Soil Sample Analytical Results RiverHouse Apartment Arlington, Virginia December February 2015 Sample # B-23 B-23 B-24 B-24 B-25 B-26 B-26 B-27 B-27 B-28 B-28 B-30 B-30 B-30 Sample Depth 9-10' 29-30' 3-4' 19-30' 33-34' 19-20' 34-35' 5-6' 35-36' 9-10' 35-36' 8-9' 8-9' 16-17' Date 12/22/ /22/ /22/ /22/ /8/ /10/ /11/ /10/ /10/ /12/ /12/2014 2/12/2015 2/12/2015 2/12/2015 Analyte Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration TPH-DRO ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) 35 ppm ND (< 10 ppm) 36 ppm ND (< 10 ppm) ND (< 10 ppm) 16 ppm ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) Benzene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) Toluene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) Ethylbenzene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) m,p-xylene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) o-xylene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) MBTE ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) Naphthalene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) * ppb -parts per billion ** ppm -parts per million ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) Soil Sample Analytical Results RiverHouse Apartment Arlington, Virginia December February 2015 Sample # B-31 B-31 B-32 B-32 B-33 B-33 B-35 B-35 B-36 B-36 B-37 B-37 N/A N/A Sample Depth 8-9' 16-17' 7-8' 16-17' 7-8' 17-18' 7-8' 17-18' 6-7' 18-19' 7-8' 16-17' N/A N/A Date 2/12/2015 2/12/2015 2/12/2015 2/12/2015 2/12/2015 2/12/2015 2/12/2015 2/12/2015 2/12/2015 2/12/2015 2/12/2015 2/12/2015 N/A N/A Analyte Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration Concetration TPH-DRO ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) ND (< 10 ppm) N/A N/A Benzene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) N/A N/A Toluene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) N/A N/A Ethylbenzene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) N/A N/A m,p-xylene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) N/A N/A o-xylene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) N/A N/A MBTE ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) N/A N/A Naphthalene ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) ND (< 5 ppb) N/A N/A * ppb -parts per billion ** ppm -parts per million

10 ATTACHMENT 1 Analytical Data Sheets and Chain of Custody Forms

11 Page 1 of 10 HPE Site Assessment Report Number: Kent Campbell Date Received: 12/08/ Elden Street, Suite 11 Date Reported: 12/10/14 Herndon, VA Project Location: RiverHouse Client Sample No: B-10 S-4 Lab Sample No.: Sample Matrix: Soil Collection Date/Time: 12/05/14 10:00 Benzene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 20:20 JP Toluene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 20:20 JP Ethylbenzene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 20:20 JP m,p-xylene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 20:20 JP o-xylene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 20:20 JP Methyl-tert-butyl ether (MTBE) < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 20:20 JP Naphthalene 1.5 ug/kg J A 12/09/14 16:30 12/09/14 20:20 JP TPH-DRO < 10 mg/kg 10 1 U A 12/08/14 10:00 12/08/14 16:11 JMP

12 Page 2 of 10 HPE Site Assessment Report Number: Kent Campbell Date Received: 12/08/ Elden Street, Suite 11 Date Reported: 12/10/14 Herndon, VA Project Location: RiverHouse Client Sample No: B-10 S-6 Lab Sample No.: Sample Matrix: Soil Collection Date/Time: 12/05/14 11:15 Benzene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 20:49 JP Toluene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 20:49 JP Ethylbenzene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 20:49 JP m,p-xylene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 20:49 JP o-xylene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 20:49 JP Methyl-tert-butyl ether (MTBE) < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 20:49 JP Naphthalene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 20:49 JP TPH-DRO < 10 mg/kg 10 1 U A 12/08/14 10:00 12/08/14 17:26 JMP

13 Page 3 of 10 HPE Site Assessment Report Number: Kent Campbell Date Received: 12/08/ Elden Street, Suite 11 Date Reported: 12/10/14 Herndon, VA Project Location: RiverHouse Client Sample No: B-13 S-4 Lab Sample No.: Sample Matrix: Soil Collection Date/Time: 12/05/14 10:05 Benzene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 21:17 JP Toluene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 21:17 JP Ethylbenzene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 21:17 JP m,p-xylene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 21:17 JP o-xylene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 21:17 JP Methyl-tert-butyl ether (MTBE) 8.4 ug/kg A 12/09/14 16:30 12/09/14 21:17 JP Naphthalene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 21:17 JP TPH-DRO 91 mg/kg 10 1 A 12/08/14 10:00 12/08/14 17:51 JMP

14 Page 4 of 10 HPE Site Assessment Report Number: Kent Campbell Date Received: 12/08/ Elden Street, Suite 11 Date Reported: 12/10/14 Herndon, VA Project Location: RiverHouse Client Sample No: B-13 S-8 Lab Sample No.: Sample Matrix: Soil Collection Date/Time: 12/05/14 11:50 Benzene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 21:46 JP Toluene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 21:46 JP Ethylbenzene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 21:46 JP m,p-xylene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 21:46 JP o-xylene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 21:46 JP Methyl-tert-butyl ether (MTBE) < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 21:46 JP Naphthalene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 21:46 JP TPH-DRO < 10 mg/kg 10 1 U A 12/08/14 10:00 12/08/14 18:16 JMP

15 Page 5 of 10 HPE Site Assessment Report Number: Kent Campbell Date Received: 12/08/ Elden Street, Suite 11 Date Reported: 12/10/14 Herndon, VA Project Location: RiverHouse Analyte Qualifier Codes U = Analyte was not detected at or above reporting limit J = Analyte detected below reporting limit (estimated value) * = Outlier Notes: Soil Results are reported on a wet weight basis (as received) unless stated as "dry". The laboratory results reflect the measurement of the sample received only and may not be completely representative of the sampled site. The Client has the responsibility for assessing risk and appropriate data interpretation of the results contained herein. Laboratory reports issued are intended for the exclusive use by the Client and shall not be reproduced except in its entirety. The chain-of-custody is a part of the entire analytical report. Residual sample(s) will be disposed of in three months unless otherwise notified. Certifications: VELAP Certification No.: 3937; Laboratory ID: Virginia Drinking Water Certification No.: 3092; Laboratory ID: Maryland Drinking Water Certification No.: 319 Laboratory Report Approved by: J Pfaff Laboratory Director, Chemistry 12/10/14 Date

16 Page 6 of 10 HP ENVIRONMENTAL INCORPORATED Analytical Sequence & QC Data Summary - BTEX Client: HPE Site Assessment Water Prep Batch No. Report: Soil Prep Batch No.: PVS004 Method: EPA 8260C Initial Calibration ID: Prep Sample Instrument Date/Time Cmpd Sample Amt Lower Upper % Diff Lab Sample Batch Type File Analyzed Analyst Compound Type Matrix Conc Added Rec. % Limit Limit % Diff Limit Outlier V CC CC A24735.D 12/09/14 18:54 JP Benzene T V CC CC A24735.D 12/09/14 18:54 JP Toluene T V CC CC A24735.D 12/09/14 18:54 JP Ethylbenzene T V CC CC A24735.D 12/09/14 18:54 JP m,p-xylene T V CC CC A24735.D 12/09/14 18:54 JP o-xylene T V CC CC A24735.D 12/09/14 18:54 JP Methyl-tert-butyl ether (MTBE T V CC CC A24735.D 12/09/14 18:54 JP Naphthalene T V CC CC A24735.D 12/09/14 18:54 JP 1,2-Dichloroethane-d4 S V CC CC A24735.D 12/09/14 18:54 JP Toluene-d8 S V CC CC A24735.D 12/09/14 18:54 JP 4-Bromofluorobenzene S PVS004- MB PVS004 MB A24736.D 12/09/14 19:23 JP Benzene T Soil PVS004- MB PVS004 MB A24736.D 12/09/14 19:23 JP Toluene T Soil PVS004- MB PVS004 MB A24736.D 12/09/14 19:23 JP Ethylbenzene T Soil PVS004- MB PVS004 MB A24736.D 12/09/14 19:23 JP m,p-xylene T Soil PVS004- MB PVS004 MB A24736.D 12/09/14 19:23 JP o-xylene T Soil PVS004- MB PVS004 MB A24736.D 12/09/14 19:23 JP Methyl-tert-butyl ether (MTBE T Soil PVS004- MB PVS004 MB A24736.D 12/09/14 19:23 JP Naphthalene T Soil PVS004- MB PVS004 MB A24736.D 12/09/14 19:23 JP 1,2-Dichloroethane-d4 S Soil PVS004- MB PVS004 MB A24736.D 12/09/14 19:23 JP Toluene-d8 S Soil PVS004- MB PVS004 MB A24736.D 12/09/14 19:23 JP 4-Bromofluorobenzene S Soil PVS004- BS PVS004 BS A24737.D 12/09/14 19:52 JP Benzene T Soil PVS004- BS PVS004 BS A24737.D 12/09/14 19:52 JP Toluene T Soil PVS004- BS PVS004 BS A24737.D 12/09/14 19:52 JP Ethylbenzene T Soil PVS004- BS PVS004 BS A24737.D 12/09/14 19:52 JP m,p-xylene T Soil PVS004- BS PVS004 BS A24737.D 12/09/14 19:52 JP o-xylene T Soil PVS004- BS PVS004 BS A24737.D 12/09/14 19:52 JP Methyl-tert-butyl ether (MTBE T Soil PVS004- BS PVS004 BS A24737.D 12/09/14 19:52 JP Naphthalene T Soil PVS004- BS PVS004 BS A24737.D 12/09/14 19:52 JP 1,2-Dichloroethane-d4 S Soil PVS004- BS PVS004 BS A24737.D 12/09/14 19:52 JP Toluene-d8 S Soil PVS004- BS PVS004 BS A24737.D 12/09/14 19:52 JP 4-Bromofluorobenzene S Soil PVS004 SAM A24738.D 12/09/14 20:20 JP 1,2-Dichloroethane-d4 S Soil PVS004 SAM A24738.D 12/09/14 20:20 JP Toluene-d8 S Soil PVS004 SAM A24738.D 12/09/14 20:20 JP 4-Bromofluorobenzene S Soil PVS004 SAM A24739.D 12/09/14 20:49 JP 1,2-Dichloroethane-d4 S Soil PVS004 SAM A24739.D 12/09/14 20:49 JP Toluene-d8 S Soil PVS004 SAM A24739.D 12/09/14 20:49 JP 4-Bromofluorobenzene S Soil PVS004 SAM A24740.D 12/09/14 21:17 JP 1,2-Dichloroethane-d4 S Soil PVS004 SAM A24740.D 12/09/14 21:17 JP Toluene-d8 S Soil PVS004 SAM A24740.D 12/09/14 21:17 JP 4-Bromofluorobenzene S Soil PVS004 SAM A24741.D 12/09/14 21:46 JP 1,2-Dichloroethane-d4 S Soil PVS004 SAM A24741.D 12/09/14 21:46 JP Toluene-d8 S Soil PVS004 SAM A24741.D 12/09/14 21:46 JP 4-Bromofluorobenzene S Soil PVS004 SAM A24742.D 12/09/14 22:15 JP 1,2-Dichloroethane-d4 S Soil PVS004 SAM A24742.D 12/09/14 22:15 JP Toluene-d8 S Soil PVS004 SAM A24742.D 12/09/14 22:15 JP 4-Bromofluorobenzene S Soil PVS004 SAM A24743.D 12/09/14 22:43 JP 1,2-Dichloroethane-d4 S Soil PVS004 SAM A24743.D 12/09/14 22:43 JP Toluene-d8 S Soil PVS004 SAM A24743.D 12/09/14 22:43 JP 4-Bromofluorobenzene S Soil PVS004 SAM A24744.D 12/09/14 23:12 JP 1,2-Dichloroethane-d4 S Soil PVS004 SAM A24744.D 12/09/14 23:12 JP Toluene-d8 S Soil PVS004 SAM A24744.D 12/09/14 23:12 JP 4-Bromofluorobenzene S Soil PVS004 SAM A24745.D 12/09/14 23:40 JP 1,2-Dichloroethane-d4 S Soil PVS004 SAM A24745.D 12/09/14 23:40 JP Toluene-d8 S Soil PVS004 SAM A24745.D 12/09/14 23:40 JP 4-Bromofluorobenzene S Soil PVS004 SAM A24746.D 12/10/14 00:09 JP 1,2-Dichloroethane-d4 S Soil PVS004 SAM A24746.D 12/10/14 00:09 JP Toluene-d8 S Soil PVS004 SAM A24746.D 12/10/14 00:09 JP 4-Bromofluorobenzene S Soil MS PVS004 MS A24747.D 12/10/14 00:37 JP Benzene T Soil MS PVS004 MS A24747.D 12/10/14 00:37 JP Toluene T Soil MS PVS004 MS A24747.D 12/10/14 00:37 JP Ethylbenzene T Soil MS PVS004 MS A24747.D 12/10/14 00:37 JP m,p-xylene T Soil

17 Page 7 of 10 HP ENVIRONMENTAL INCORPORATED Analytical Sequence & QC Data Summary - BTEX Client: HPE Site Assessment Water Prep Batch No. Report: Soil Prep Batch No.: PVS004 Method: EPA 8260C Initial Calibration ID: Prep Sample Instrument Date/Time Cmpd Sample Amt Lower Upper % Diff Lab Sample Batch Type File Analyzed Analyst Compound Type Matrix Conc Added Rec. % Limit Limit % Diff Limit Outlier MS PVS004 MS A24747.D 12/10/14 00:37 JP o-xylene T Soil MS PVS004 MS A24747.D 12/10/14 00:37 JP Methyl-tert-butyl ether (MTBE T Soil MS PVS004 MS A24747.D 12/10/14 00:37 JP Naphthalene T Soil MS PVS004 MS A24747.D 12/10/14 00:37 JP 1,2-Dichloroethane-d4 S Soil MS PVS004 MS A24747.D 12/10/14 00:37 JP Toluene-d8 S Soil MS PVS004 MS A24747.D 12/10/14 00:37 JP 4-Bromofluorobenzene S Soil MSDPVS004 MSD A24748.D 12/10/14 01:06 JP Benzene T Soil MSDPVS004 MSD A24748.D 12/10/14 01:06 JP Toluene T Soil MSDPVS004 MSD A24748.D 12/10/14 01:06 JP Ethylbenzene T Soil MSDPVS004 MSD A24748.D 12/10/14 01:06 JP m,p-xylene T Soil MSDPVS004 MSD A24748.D 12/10/14 01:06 JP o-xylene T Soil MSDPVS004 MSD A24748.D 12/10/14 01:06 JP Methyl-tert-butyl ether (MTBE T Soil MSDPVS004 MSD A24748.D 12/10/14 01:06 JP Naphthalene T Soil * MSDPVS004 MSD A24748.D 12/10/14 01:06 JP 1,2-Dichloroethane-d4 S Soil MSDPVS004 MSD A24748.D 12/10/14 01:06 JP Toluene-d8 S Soil MSDPVS004 MSD A24748.D 12/10/14 01:06 JP 4-Bromofluorobenzene S Soil

18 Page 8 of 10 HP ENVIRONMENTAL INCORPORATED Analytical Sequence & QC Data Summary - TPH-DRO Client: HPE Site Assessment Water Prep Batch No. Report: Soil Prep Batch No.: PDS008 Method: EPA 8015C Initial Calibration ID: Prep Sample Instrument Date/Time Cmpd Sample Amt Lower Upper % Diff Lab Sample Batch Type File Analyzed Analyst Compound Type Matrix Conc Added Rec. % Limit Limit % Diff Limit Outlier D CC CC GC27458.D 12/08/14 10:08 JMP TPH-DRO T D CC CC GC27458.D 12/08/14 10:08 JMP o-terphenyl S PDS008- MB PDS008 MB GC27463.D 12/08/14 13:41 JMP TPH-DRO T Soil PDS008- MB PDS008 MB GC27463.D 12/08/14 13:41 JMP o-terphenyl S Soil PDS008- BS PDS008 BS GC27464.D 12/08/14 14:06 JMP TPH-DRO T Soil PDS008- BS PDS008 BS GC27464.D 12/08/14 14:06 JMP o-terphenyl S Soil PDS008 SAM GC27469.D 12/08/14 16:11 JMP o-terphenyl S Soil MS PDS008 MS GC27470.D 12/08/14 16:36 JMP TPH-DRO T Soil MS PDS008 MS GC27470.D 12/08/14 16:36 JMP o-terphenyl S Soil MSDPDS008 MSD GC27471.D 12/08/14 17:01 JMP TPH-DRO T Soil MSDPDS008 MSD GC27471.D 12/08/14 17:01 JMP o-terphenyl S Soil PDS008 SAM GC27472.D 12/08/14 17:26 JMP o-terphenyl S Soil PDS008 SAM GC27473.D 12/08/14 17:51 JMP o-terphenyl S Soil PDS008 SAM GC27474.D 12/08/14 18:16 JMP o-terphenyl S Soil D CC CC GC27475.D 12/08/14 18:41 JMP TPH-DRO T D CC CC GC27475.D 12/08/14 18:41 JMP o-terphenyl S

19 Page 9 of 10 Sample Receipt and Inspection Form HPE Report Number: Client: HPE Site Assessment Kent Campbell Received by: JP Date/Time: 12/08/14 08: Elden Street, Suite 11 Logged by: JP Date/Time: 12/08/14 12:00 Herndon, VA Shipment Mode: Drop-Off Turnaround Time: Standard PO No: Project ID: RiverHouse Contamination Control Documentation Trip Blank(s) Submitted? N/A Test Request/COC Submitted? Yes Field Blank(s) Submitted? No Container Labels Agree with COC? Yes Custody Seals Present? No Analyte Stabilization Comments Samples Acidified as Appropriate? N/A Thiosulfate Added as Appropriate? N/A Headspace Absent in VOA Vials? N/A Samples Received on Ice? Yes Sample Receipt Temp. ( o C ): 4 Number of Samples: 4 Summary of Samples Received Collection Storage Sample # HPE# Cont. Matrix Date/Time Container PreservativeLocation Test Comments B-10 S A Soil 12/05/14 10:00 4 oz Jar None R2 BTEX/M/N B-10 S A Soil 12/05/14 10:00 4 oz Jar None R2 TPH-DRO B-10 S A Soil 12/05/14 11:15 4 oz Jar None R2 BTEX/M/N B-10 S A Soil 12/05/14 11:15 4 oz Jar None R2 TPH-DRO B-13 S A Soil 12/05/14 10:05 4 oz Jar None R2 BTEX/M/N B-13 S A Soil 12/05/14 10:05 4 oz Jar None R2 TPH-DRO B-13 S A Soil 12/05/14 11:50 4 oz Jar None R2 BTEX/M/N B-13 S A Soil 12/05/14 11:50 4 oz Jar None R2 TPH-DRO

20 Page 10 of 10

21 Page 1 of 11 HPE Site Assessment Report Number: Kent Campbell Date Received: 12/09/ Elden Street, Suite 11 Date Reported: 12/13/14 Herndon, VA Project Location: RiverHouse Client Sample No: B-3 S-8 Lab Sample No.: Sample Matrix: Soil Collection Date/Time: 12/08/14 10:05 Benzene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 22:15 JP Toluene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 22:15 JP Ethylbenzene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 22:15 JP m,p-xylene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 22:15 JP o-xylene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 22:15 JP Methyl-tert-butyl ether (MTBE) < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 22:15 JP Naphthalene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 22:15 JP TPH-DRO < 10 mg/kg 10 1 U A 12/10/14 09:30 12/10/14 11:09 JMP

22 Page 2 of 11 HPE Site Assessment Report Number: Kent Campbell Date Received: 12/09/ Elden Street, Suite 11 Date Reported: 12/13/14 Herndon, VA Project Location: RiverHouse Client Sample No: B-3 S-10 Lab Sample No.: Sample Matrix: Soil Collection Date/Time: 12/08/14 10:40 Benzene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 22:43 JP Toluene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 22:43 JP Ethylbenzene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 22:43 JP m,p-xylene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 22:43 JP o-xylene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 22:43 JP Methyl-tert-butyl ether (MTBE) < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 22:43 JP Naphthalene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 22:43 JP TPH-DRO < 10 mg/kg 10 1 U A 12/10/14 09:30 12/10/14 12:25 JMP

23 Page 3 of 11 HPE Site Assessment Report Number: Kent Campbell Date Received: 12/09/ Elden Street, Suite 11 Date Reported: 12/13/14 Herndon, VA Project Location: RiverHouse Client Sample No: B-25 S-9 Lab Sample No.: Sample Matrix: Soil Collection Date/Time: 12/08/14 11:15 Benzene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 23:12 JP Toluene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 23:12 JP Ethylbenzene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 23:12 JP m,p-xylene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 23:12 JP o-xylene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 23:12 JP Methyl-tert-butyl ether (MTBE) < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 23:12 JP Naphthalene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 23:12 JP TPH-DRO 35 mg/kg 10 1 A 12/10/14 09:30 12/10/14 12:50 JMP

24 Page 4 of 11 HPE Site Assessment Report Number: Kent Campbell Date Received: 12/09/ Elden Street, Suite 11 Date Reported: 12/13/14 Herndon, VA Project Location: RiverHouse Client Sample No: B-16 S-5 Lab Sample No.: Sample Matrix: Soil Collection Date/Time: 12/08/14 10:10 Benzene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 23:40 JP Toluene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 23:40 JP Ethylbenzene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 23:40 JP m,p-xylene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 23:40 JP o-xylene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 23:40 JP Methyl-tert-butyl ether (MTBE) < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 23:40 JP Naphthalene < 5.0 ug/kg U A 12/09/14 16:30 12/09/14 23:40 JP TPH-DRO < 10 mg/kg 10 1 U A 12/10/14 09:30 12/10/14 13:15 JMP

25 Page 5 of 11 HPE Site Assessment Report Number: Kent Campbell Date Received: 12/09/ Elden Street, Suite 11 Date Reported: 12/13/14 Herndon, VA Project Location: RiverHouse Client Sample No: B-16 S-8 Lab Sample No.: Sample Matrix: Soil Collection Date/Time: 12/08/14 11:40 Benzene < 5.0 ug/kg U A 12/09/14 16:30 12/10/14 00:09 JP Toluene < 5.0 ug/kg U A 12/09/14 16:30 12/10/14 00:09 JP Ethylbenzene < 5.0 ug/kg U A 12/09/14 16:30 12/10/14 00:09 JP m,p-xylene < 5.0 ug/kg U A 12/09/14 16:30 12/10/14 00:09 JP o-xylene < 5.0 ug/kg U A 12/09/14 16:30 12/10/14 00:09 JP Methyl-tert-butyl ether (MTBE) < 5.0 ug/kg U A 12/09/14 16:30 12/10/14 00:09 JP Naphthalene < 5.0 ug/kg U A 12/09/14 16:30 12/10/14 00:09 JP TPH-DRO < 10 mg/kg 10 1 U A 12/10/14 09:30 12/10/14 13:40 JMP

26 Page 6 of 11 HPE Site Assessment Report Number: Kent Campbell Date Received: 12/09/ Elden Street, Suite 11 Date Reported: 12/13/14 Herndon, VA Project Location: RiverHouse Analyte Qualifier Codes Notes: Soil Results are reported on a wet weight basis (as received) unless stated as "dry". The laboratory results reflect the measurement of the sample received only and may not be completely representative of the sampled site. The Client has the responsibility for assessing risk and appropriate data interpretation of the results contained herein. Laboratory reports issued are intended for the exclusive use by the Client and shall not be reproduced except in its entirety. The chain-of-custody is a part of the entire analytical report. Residual sample(s) will be disposed of in three months unless otherwise notified. Certifications: VELAP Certification No.: 3937; Laboratory ID: Virginia Drinking Water Certification No.: 3092; Laboratory ID: Maryland Drinking Water Certification No.: 319 Laboratory Report Approved by: J Pfaff Laboratory Director, Chemistry 12/13/14 Date

27 Page 7 of 11 HP ENVIRONMENTAL INCORPORATED Analytical Sequence & QC Data Summary - BTEX Client: HPE Site Assessment Water Prep Batch No. Report: Soil Prep Batch No.: PVS004 Method: EPA 8260C Initial Calibration ID: Prep Sample Instrument Date/Time Cmpd Sample Amt Lower Upper % Diff Lab Sample Batch Type File Analyzed Analyst Compound Type Matrix Conc Added Rec. % Limit Limit % Diff Limit Outlier V CC CC A24735.D 12/09/14 18:54 JP Benzene T V CC CC A24735.D 12/09/14 18:54 JP Toluene T V CC CC A24735.D 12/09/14 18:54 JP Ethylbenzene T V CC CC A24735.D 12/09/14 18:54 JP m,p-xylene T V CC CC A24735.D 12/09/14 18:54 JP o-xylene T V CC CC A24735.D 12/09/14 18:54 JP Methyl-tert-butyl ether (MTBE T V CC CC A24735.D 12/09/14 18:54 JP Naphthalene T V CC CC A24735.D 12/09/14 18:54 JP 1,2-Dichloroethane-d4 S V CC CC A24735.D 12/09/14 18:54 JP Toluene-d8 S V CC CC A24735.D 12/09/14 18:54 JP 4-Bromofluorobenzene S PVS004- MB PVS004 MB A24736.D 12/09/14 19:23 JP Benzene T Soil PVS004- MB PVS004 MB A24736.D 12/09/14 19:23 JP Toluene T Soil PVS004- MB PVS004 MB A24736.D 12/09/14 19:23 JP Ethylbenzene T Soil PVS004- MB PVS004 MB A24736.D 12/09/14 19:23 JP m,p-xylene T Soil PVS004- MB PVS004 MB A24736.D 12/09/14 19:23 JP o-xylene T Soil PVS004- MB PVS004 MB A24736.D 12/09/14 19:23 JP Methyl-tert-butyl ether (MTBE T Soil PVS004- MB PVS004 MB A24736.D 12/09/14 19:23 JP Naphthalene T Soil PVS004- MB PVS004 MB A24736.D 12/09/14 19:23 JP 1,2-Dichloroethane-d4 S Soil PVS004- MB PVS004 MB A24736.D 12/09/14 19:23 JP Toluene-d8 S Soil PVS004- MB PVS004 MB A24736.D 12/09/14 19:23 JP 4-Bromofluorobenzene S Soil PVS004- BS PVS004 BS A24737.D 12/09/14 19:52 JP Benzene T Soil PVS004- BS PVS004 BS A24737.D 12/09/14 19:52 JP Toluene T Soil PVS004- BS PVS004 BS A24737.D 12/09/14 19:52 JP Ethylbenzene T Soil PVS004- BS PVS004 BS A24737.D 12/09/14 19:52 JP m,p-xylene T Soil PVS004- BS PVS004 BS A24737.D 12/09/14 19:52 JP o-xylene T Soil PVS004- BS PVS004 BS A24737.D 12/09/14 19:52 JP Methyl-tert-butyl ether (MTBE T Soil PVS004- BS PVS004 BS A24737.D 12/09/14 19:52 JP Naphthalene T Soil PVS004- BS PVS004 BS A24737.D 12/09/14 19:52 JP 1,2-Dichloroethane-d4 S Soil PVS004- BS PVS004 BS A24737.D 12/09/14 19:52 JP Toluene-d8 S Soil PVS004- BS PVS004 BS A24737.D 12/09/14 19:52 JP 4-Bromofluorobenzene S Soil PVS004 SAM A24738.D 12/09/14 20:20 JP 1,2-Dichloroethane-d4 S Soil PVS004 SAM A24738.D 12/09/14 20:20 JP Toluene-d8 S Soil PVS004 SAM A24738.D 12/09/14 20:20 JP 4-Bromofluorobenzene S Soil PVS004 SAM A24739.D 12/09/14 20:49 JP 1,2-Dichloroethane-d4 S Soil PVS004 SAM A24739.D 12/09/14 20:49 JP Toluene-d8 S Soil PVS004 SAM A24739.D 12/09/14 20:49 JP 4-Bromofluorobenzene S Soil PVS004 SAM A24740.D 12/09/14 21:17 JP 1,2-Dichloroethane-d4 S Soil PVS004 SAM A24740.D 12/09/14 21:17 JP Toluene-d8 S Soil PVS004 SAM A24740.D 12/09/14 21:17 JP 4-Bromofluorobenzene S Soil PVS004 SAM A24741.D 12/09/14 21:46 JP 1,2-Dichloroethane-d4 S Soil PVS004 SAM A24741.D 12/09/14 21:46 JP Toluene-d8 S Soil PVS004 SAM A24741.D 12/09/14 21:46 JP 4-Bromofluorobenzene S Soil PVS004 SAM A24742.D 12/09/14 22:15 JP 1,2-Dichloroethane-d4 S Soil PVS004 SAM A24742.D 12/09/14 22:15 JP Toluene-d8 S Soil PVS004 SAM A24742.D 12/09/14 22:15 JP 4-Bromofluorobenzene S Soil PVS004 SAM A24743.D 12/09/14 22:43 JP 1,2-Dichloroethane-d4 S Soil PVS004 SAM A24743.D 12/09/14 22:43 JP Toluene-d8 S Soil PVS004 SAM A24743.D 12/09/14 22:43 JP 4-Bromofluorobenzene S Soil PVS004 SAM A24744.D 12/09/14 23:12 JP 1,2-Dichloroethane-d4 S Soil PVS004 SAM A24744.D 12/09/14 23:12 JP Toluene-d8 S Soil PVS004 SAM A24744.D 12/09/14 23:12 JP 4-Bromofluorobenzene S Soil PVS004 SAM A24745.D 12/09/14 23:40 JP 1,2-Dichloroethane-d4 S Soil PVS004 SAM A24745.D 12/09/14 23:40 JP Toluene-d8 S Soil PVS004 SAM A24745.D 12/09/14 23:40 JP 4-Bromofluorobenzene S Soil PVS004 SAM A24746.D 12/10/14 00:09 JP 1,2-Dichloroethane-d4 S Soil PVS004 SAM A24746.D 12/10/14 00:09 JP Toluene-d8 S Soil PVS004 SAM A24746.D 12/10/14 00:09 JP 4-Bromofluorobenzene S Soil MS PVS004 MS A24747.D 12/10/14 00:37 JP Benzene T Soil MS PVS004 MS A24747.D 12/10/14 00:37 JP Toluene T Soil MS PVS004 MS A24747.D 12/10/14 00:37 JP Ethylbenzene T Soil MS PVS004 MS A24747.D 12/10/14 00:37 JP m,p-xylene T Soil

28 Page 8 of 11 HP ENVIRONMENTAL INCORPORATED Analytical Sequence & QC Data Summary - BTEX Client: HPE Site Assessment Water Prep Batch No. Report: Soil Prep Batch No.: PVS004 Method: EPA 8260C Initial Calibration ID: Prep Sample Instrument Date/Time Cmpd Sample Amt Lower Upper % Diff Lab Sample Batch Type File Analyzed Analyst Compound Type Matrix Conc Added Rec. % Limit Limit % Diff Limit Outlier MS PVS004 MS A24747.D 12/10/14 00:37 JP o-xylene T Soil MS PVS004 MS A24747.D 12/10/14 00:37 JP Methyl-tert-butyl ether (MTBE T Soil MS PVS004 MS A24747.D 12/10/14 00:37 JP Naphthalene T Soil MS PVS004 MS A24747.D 12/10/14 00:37 JP 1,2-Dichloroethane-d4 S Soil MS PVS004 MS A24747.D 12/10/14 00:37 JP Toluene-d8 S Soil MS PVS004 MS A24747.D 12/10/14 00:37 JP 4-Bromofluorobenzene S Soil MSDPVS004 MSD A24748.D 12/10/14 01:06 JP Benzene T Soil MSDPVS004 MSD A24748.D 12/10/14 01:06 JP Toluene T Soil MSDPVS004 MSD A24748.D 12/10/14 01:06 JP Ethylbenzene T Soil MSDPVS004 MSD A24748.D 12/10/14 01:06 JP m,p-xylene T Soil MSDPVS004 MSD A24748.D 12/10/14 01:06 JP o-xylene T Soil MSDPVS004 MSD A24748.D 12/10/14 01:06 JP Methyl-tert-butyl ether (MTBE T Soil MSDPVS004 MSD A24748.D 12/10/14 01:06 JP Naphthalene T Soil * MSDPVS004 MSD A24748.D 12/10/14 01:06 JP 1,2-Dichloroethane-d4 S Soil MSDPVS004 MSD A24748.D 12/10/14 01:06 JP Toluene-d8 S Soil MSDPVS004 MSD A24748.D 12/10/14 01:06 JP 4-Bromofluorobenzene S Soil

29 Page 9 of 11 HP ENVIRONMENTAL INCORPORATED Analytical Sequence & QC Data Summary - TPH-DRO Client: HPE Site Assessment Water Prep Batch No. Report: Soil Prep Batch No.: PDS009 Method: EPA 8015C Initial Calibration ID: Prep Sample Instrument Date/Time Cmpd Sample Amt Lower Upper % Diff Lab Sample Batch Type File Analyzed Analyst Compound Type Matrix Conc Added Rec. % Limit Limit % Diff Limit Outlier D CC CC GC27492.D 12/10/14 09:54 JMP TPH-DRO T D CC CC GC27492.D 12/10/14 09:54 JMP o-terphenyl S PDS009- MB PDS009 MB GC27493.D 12/10/14 10:19 JMP TPH-DRO T Soil PDS009- MB PDS009 MB GC27493.D 12/10/14 10:19 JMP o-terphenyl S Soil PDS009- BS PDS009 BS GC27494.D 12/10/14 10:44 JMP TPH-DRO T Soil PDS009- BS PDS009 BS GC27494.D 12/10/14 10:44 JMP o-terphenyl S Soil PDS009 SAM GC27495.D 12/10/14 11:09 JMP o-terphenyl S Soil MS PDS009 MS GC27496.D 12/10/14 11:34 JMP TPH-DRO T Soil MS PDS009 MS GC27496.D 12/10/14 11:34 JMP o-terphenyl S Soil * MSDPDS009 MSD GC27497.D 12/10/14 11:59 JMP TPH-DRO T Soil MSDPDS009 MSD GC27497.D 12/10/14 11:59 JMP o-terphenyl S Soil PDS009 SAM GC27498.D 12/10/14 12:25 JMP o-terphenyl S Soil * PDS009 SAM GC27499.D 12/10/14 12:50 JMP o-terphenyl S Soil PDS009 SAM GC27500.D 12/10/14 13:15 JMP o-terphenyl S Soil PDS009 SAM GC27501.D 12/10/14 13:40 JMP o-terphenyl S Soil D CC CC GC27506.D 12/10/14 15:46 JMP TPH-DRO T D CC CC GC27506.D 12/10/14 15:46 JMP o-terphenyl S