ROUX ASSOCIATES, INC. Environmental Consulting & Management

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1 August 14, 2007 PHASE II SOIL VAPOR EXTRACTION PILOT STUDY Greenpoint, Brooklyn, New York Prepared for EXXONMOBIL REFINING AND SUPPLY COMPANY 400 Kingsland Avenue Brooklyn, New York ROUX ASSOCIATES, INC. Environmental Consulting & Management 209 Shafter Street, Islandia, New York MC17230Y21.906/CV

2 TABLE OF CONTENTS 1.0 INTRODUCTION PHASE II PILOT STUDY SCOPE OF WORK Installation of Phase II Pilot Study Wells Phase II SVE Pilot Testing Methodology Soil Vapor Screening and Monitoring ICE Engine Performance Field Monitoring Community Air Monitoring and Utility Manhole Screening SVE Test Summary PILOT STUDY RESULTS SVE-5 Test Results SVE-4 Test 1 Results SVE-4 Test 2 Results SVE-6 Test Results SVE-3 Test Results ICE Performance Data PHASE II PILOT TEST CONCLUSIONS CONCEPTUAL VAPOR MITIGATION PLAN Rationale and Objectives Proposed SVE System Preliminary Implementation Schedule REFERENCES...19 TABLES 1. Summary of VOCs and Methane in Soil Vapor 2. Summary of Phase II SVE Pilot Study Results 3. Summary of Influent and Effluent Concentrations for SVE Tests FIGURES 1. Phase II SVE Pilot Study Location 2. Phase II SVE Pilot Study Area Site Plan 3. Soil Vapor Extraction Well Construction Details 4. Typical Newly Installed Soil Vapor Monitoring Point Construction 5. Typical Existing Soil Vapor Monitoring Point Construction 6. Radius of Influence Calculation SVE-5 Test 7. Radius of Influence Calculation SVE-4 Test 1 8. Radius of Influence Calculation SVE-4 Test 2 9. Radius of Influence Calculation SVE-6 Test 10. Radius of Influence Calculation SVE-3 Test ROUX ASSOCIATES, INC. - i - MC17230Y21.906/R

3 TABLE OF CONTENTS (Continued) FIGURES (Continued) 11. Methane Concentrations in Soil Vapor During SVE-5 Test 12. Methane Concentrations in Soil Vapor During SVE-4 Test Methane Concentrations in Soil Vapor During SVE-4 Test Methane Concentrations in Soil Vapor During SVE-6 Test 15. Methane Concentrations in Soil Vapor During SVE-3 Test 16. Makeup Propane Usage During Phase II SVE Pilot Study 17. Proposed Locations of SVE Wells for the Full-scale SVE System PLATES 1. Benzene and Methane Concentrations in Soil Vapor 2-3 ft bls During Phase II Pilot Study 2. Benzene and Methane Concentrations in Soil Vapor 7-8 ft bls During Phase II Pilot Study APPENDICES A. AccuTest Soil Gas Laboratory Analytical Data B. SVE Pilot Study Field Monitoring Forms C. SVE Pilot Study System Parameters D. VOC Community Air Monitoring Forms E. Utility Screening Data for Manholes Proximate to Pilot Study Area ROUX ASSOCIATES, INC. - ii - MC17230Y21.906/R

4 1.0 INTRODUCTION Roux Associates, Inc. (Roux Associates) has prepared the following report for ExxonMobil Refining and Supply Company (ExxonMobil) to summarize the results of the Phase II Soil Vapor Extraction (SVE) Pilot Study for the intersection of Norman Avenue, Bridgewater Street, Apollo Street, and Van Dam Street (Pilot Study Area) in Greenpoint, Brooklyn, New York (Site). The Pilot Study Area is located within a Commercial/Industrial Area, as shown on Figure 1. The phase II pilot study was performed in accordance with the Scope of Work for the Phase II Soil Vapor Extraction Pilot Study (Phase II Pilot Study Work Plan [Roux Associates, 2007]) dated March 22, 2007, approved by the New York State Department of Environmental Conservation (NYSDEC) in a letter dated April 24, The first phase of the SVE pilot study, which was conducted in November/December 2006, indicated that vertical SVE wells could potentially be effective for mitigation of the concentrations of methane and other volatile organic compounds (VOCs) in the shallow soil vapor (i.e., less than 8 feet depth below the land surface) beneath the Pilot Study Area. The results of the first phase SVE pilot study was presented in the report dated January 31, 2007, titled Soil Vapor Extraction/Bioventing Pilot Study Summary Report (Roux Associates, 2007). The purpose of the phase II SVE pilot study was to provide additional information necessary to proceed with a full-scale design of a SVE system for mitigation of methane and VOCs in the shallow soil vapor (i.e., less than 8 feet depth below the land surface). Specifically, the phase II SVE pilot study was conducted over a longer duration involving multiple SVE wells to address the following issues: Confirm that the radius of influence (ROI) of 75 feet, observed during the first phase, can be achieved at other locations; Evaluate optimal SVE well screen interval depth; Further evaluate the potential effect of street utilities and existing building foundation on the required spacing of the SVE wells; and Determine the appropriate off-gas treatment technology and efficiency during long-term operation of the SVE system. ROUX ASSOCIATES, INC MC17230Y21.906/R

5 This report describes the scope of work for phase II SVE pilot testing, presents the results of the phase II SVE pilot testing, provides the rationale and objectives for a vapor mitigation system, a conceptual SVE system design, and preliminary schedule for implementation of a full-scale SVE system. Background information regarding the soil vapor investigations previously completed within the area is provided in the report dated September 29, 2006, titled Phase IV Soil Vapor Investigation Report (Roux Associates, 2006a), as well as the report dated March 30, 2007, titled Biannual Soil Vapor Sampling First Quarter 2007 (Roux Associates, 2007b). ROUX ASSOCIATES, INC MC17230Y21.906/R

6 2.0 PHASE II PILOT STUDY SCOPE OF WORK The Phase II SVE Pilot Study consisted of the following activities: Installation of Pilot Study Wells and Monitoring Points; and SVE Pilot Testing and Performance Monitoring. A description of each activity is provided below. 2.1 Installation of Phase II Pilot Study Wells Three SVE wells (SVE-4, SVE-5, SVE-6) and seven sets of nested soil vapor monitoring points (MP-SVE-4 through MP-SVE-10) were installed for the phase II pilot study. The phase II pilot study also utilized existing SVE well (SVE-3), paired vapor monitoring points (MP-1, MP-2, MP-5, MP-6, MP-7, MP-9, MP-10, and MP-11), and nested vapor monitoring points (MP-SVE-1, MP-SVE-2, and MP-SVE-3). The location of the phase II pilot study SVE wells and monitoring points are shown on Figure 2. In accordance with ExxonMobil pre-drilling protocols, soils were excavated at all proposed locations from land surface to 5 feet below land surface (ft bls) using an air knife before intrusive activities began. The SVE wells were installed using a hollow-stem auger drill rig by Aquifer Drilling and Testing, Inc. under the oversight of Roux Associates. Each well is constructed of 4-inch diameter Schedule 40 polyvinyl chloride (PVC). The SVE wells have the following screened intervals: SVE-5 is screened from 7 to 12 ft bls; both SVE-4 and SVE-6 are screened from approximately 13 to 18 ft bls. The existing well SVE-3 was screened from 13 to 18 ft bls. The construction details of the SVE wells are shown on Figure 3. The nested soil vapor monitoring points MP-SVE-4 through MP-SVE-10 each consist of three points (shallow, intermediate, and deep) installed at depth intervals of 2 to 3, 7 to 8, and 14 to 15 ft bls, respectively. The nested soil vapor monitoring points were installed using a Geoprobe rig following the same techniques and methods used during the first phase of the pilot study. The construction details of the soil vapor monitoring points are shown on Figure 4. The existing paired soil vapor monitoring points MP-1, MP-2, MP-5, MP-6, MP-7, MP-9, MP-10, MP-11 were previously installed as part of the offsite soil vapor investigation and consist ROUX ASSOCIATES, INC MC17230Y21.906/R

7 of a shallow and deep point at each location. The shallow and deep monitoring points at each location are spaced about 4 feet from one another. The shallow points (e.g., MP-1S) were installed to a depth of 2 to 3 ft bls and the deep points (e.g., MP-1D) were installed to a depth of 7 to 8 ft bls. The paired deep points (e.g., MP-1D) were installed at the same depth interval as that of the intermediate points of the nested vapor monitoring points (e.g., MP-SVE-4I). The construction details of the existing soil vapor monitoring points are shown on Figure Phase II SVE Pilot Testing Methodology In accordance with the Phase II Pilot Study Work Plan (Roux Associates, 2007), the pilot testing was conducted over a five-week period from May 18, 2007 to June 21, Each week an SVE test was conducted on one of the four extractions wells for approximately 72 hours, with associated soil vapor sampling and monitoring to evaluate subsurface response at surrounding locations. During the phase II SVE pilot testing, an internal combustion engine (ICE) was used as both a vacuum blower and as off-gas treatment for the methane and other VOCs in the extracted soil vapor. The ICE engines used during the phase II pilot study were provided by Brilliant Lewis Environmental Services, LLC, located in Lakewood, New Jersey. Each ICE engine was equipped with an automatic controller, an emission control system, and a catalytic converter and was sized to handle 150 standard cubic feet per minute (scfm) at a vacuum of 20 inches of mercury. The ICE engines are designed to favor methane and other VOCs extracted from the SVE wells as the primary fuel source, and automatically adjust the supplemental fuel (liquid propane) to extracted vapor ratio to compensate changing influent hydrocarbon concentrations and maintain the optimal air/fuel ratio and keep the temperature of the catalytic converter at or slightly below 1,200 degrees Fahrenheit. The liquid propane was supplied in 100-pound cylinders. The ICE and propane cylinders were kept under constant 24-hour around the clock surveillance during the course of each test to ensure security and prevent tampering with the equipment Soil Vapor Screening and Monitoring During the pilot study, soil vapor samples were collected for laboratory analysis prior to (i.e., baseline) and at the conclusion (i.e., endpoint) of each 72-hour testing period. In general, the baseline samples of each test were collected from existing vapor monitoring points (MP-1, MP-2, MP-5, MP-6, MP-7, MP-9, MP-10, MP-11, MP-SVE-1, MP-SVE-2, and MP-SVE-3) and ROUX ASSOCIATES, INC MC17230Y21.906/R

8 newly-installed nested vapor monitoring points (MP-SVE-4 through MP-SVE-10). The endpoint samples of each test were collected from selected vapor monitoring points located within the radius of influence of the test as estimated from the real time monitoring results. With the exception of the last test at SVE-3, the soil vapor air samples were collected and submitted for VOC analysis using United States Environmental Protection Agency (USEPA) Method TO-15 and for methane analysis using USEPA Method TO-3. Following receipt of the samples, Accutest initially screened the samples. Specially, those samples that contain benzene concentrations greater than 10,000 parts per billion by volume (ppbv) would be analyzed by Method TO-3 (in order to avoid fouling the more sensitive TO-15 instruments), while those samples that contain benzene concentrations less than 10,000 ppbv would continue to be analyzed by TO-15. The baseline vapor samples collected on June 18, 2007 and endpoint samples collected on June 21, 2007 for the test on SVE-3 were analyzed for VOCs using a reduced TO-3 list, focusing on benzene, toluene, ethylbenzene and xylene (BTEX) and methane only. The laboratory, AccuTest in Dayton, New Jersey was utilized for all the sample analysis. The results of the soil vapor sampling are summarized in Table 1. The laboratory analytical results for the soil vapor sampling are provided in Appendix A. The vacuum response, lower explosive limit (LEL), oxygen, and VOC concentrations (i.e., PID readings) were monitored at the soil vapor monitoring points on an ongoing basis during each testing phase using a digital gas pressure manometer or magnehelic vacuum gauges, and multigas meters (MultiRAE Plus). The multi-gas meters were calibrated every eight hours or at least daily. LEL was measured as a percentage of the lower explosion limit for methane (where 100% LEL equals 50,000 parts per million volume [ppmv] methane). Oxygen was measured as percent volume, and VOC concentrations were measured as ppmv. Field readings were recorded on forms that have been compiled and included in Appendix B ICE Engine Performance Field Monitoring During the pilot study, ICE engine performance was monitored on a continuous basis with parameters recorded on data sheets every two hours. The monitoring of the ICE engine consisted of periodic readings of the information provided by the automatic controller, including calculated wellhead vacuum, extracted air flowrate from the SVE well, total flowrate (extracted air, supplemental fuel, and engine dilution air), the British thermal unit (BTU)/hour levels that is ROUX ASSOCIATES, INC MC17230Y21.906/R

9 entering the ICE from the SVE well, methane equivalent of extracted vapor (ppmv), and supplemental fuel valve ratio status. VOC concentrations of ICE influent and effluent (stack offgas) were monitored every two hours using a multigas meter (MultiRAE Plus). Field readings of the system parameters were included in Appendix C Community Air Monitoring and Utility Manhole Screening During the pilot study, VOC concentrations (i.e., PID readings) were monitored using a multigas meter on an ongoing basis at upwind and downwind locations, approximately 20 to 30 ft away from the ICE engine(s). The community air monitoring results are provided in Appendix D. In addition, five utility manholes (MH-1, MH-2, MH-3, MH-4, and MH-5) in the pilot study area were screened for the presence of VOCs, oxygen, and percent LEL. The approximate locations of the utility manholes are shown on Figure 2. The summary of the utility manhole screening data is provided in Appendix E. 2.3 SVE Test Summary The phase II SVE pilot test phase consisted of the following five separate tests conducted sequentially: SVE-5 test (May 18, 2007 May 24, 2007); SVE-4 first test (May 29, 2007 June 1, 2007); SVE-4 second test (June 5, 2007 June 8, 2007); SVE-6 test (June 11, 2007 June 14, 2007); and SVE-3 test (June 18, 2007 June 21, 2007). SVE-5 is the only well with a shallower screen interval (7-12 ft bls), compared to a deeper screen interval (13-18 ft bls) for other wells (SVE-3, SVE-4, and SVE-6). The ICE engine is designed to automatically adjust the well valve opening status and wellhead vacuum levels to prevent the temperature of the catalytic converter from exceeding 1,200 degrees Fahrenheit, based on the subsurface soil vapor VOC concentrations. Thus, the actual wellhead vacuum that could be achieved would be dependent on the subsurface soil permeability and the VOC concentration in ROUX ASSOCIATES, INC MC17230Y21.906/R

10 the extracted soil vapor. Initially, the tests on SVE-5 and SVE-4 utilized a single ICE engine. In order to expand the radius of influence and increase vacuum and extracted air flowrates, the second test on SVE-4 and the tests on SVE-6 and SVE-3 utilized two ICE engines operating in parallel. Each test was conducted for approximately 72 hours or until a near steady-state condition with respect to subsurface radius of influence has reached. A minimum of three days was allotted between SVE tests in order to assess the rebound in soil vapor concentrations and to allow conditions to stabilize prior to conducting the next test. As discussed above, the 100-pound liquid propane gas cylinders were used as makeup fuel during the engine startup and operation periods. Whenever the propane gas cylinder was empty, the ICE would shut off automatically, and then the propane tank would be changed out and the engine restarted. The estimated time between change-out of the propane gas cylinders was recorded to calculate the makeup propane usage rate (lbs/hour). Typically, it took approximately between 45 minutes to 1 hour for the wellhead vacuum and air flowrates to reach steady conditions after the initial startup or restart of the ICE engines. ROUX ASSOCIATES, INC MC17230Y21.906/R

11 3.0 PILOT STUDY RESULTS The following section discusses the results of the phase II SVE pilot study. A summary of phase II SVE pilot study results is presented in Table 2. The radius of influence (ROI) calculations for each test, using the 0.1 inch water column (in. w.c.) rule of thumb as the minimum vacuum response, are presented in Figures 6 through 10. The methane concentrations in both 2-3 ft bls and 7-8 ft bls depths prior to and following each individual SVE test are presented in Figures 11 through 15. These figures also delineate the areas where, prior to each test, the methane concentrations exceeded 12,500 ppmv at the 2 to 3 ft bls and 50,000 ppmv at the 7 to 8 ft bls; and the area where by the conclusion of each test the concentrations had been reduced to below these thresholds. In general, the highest levels of soil vapor methane concentrations are from MP-SVE-10, which is adjacent to the BP Amoco Terminal. Benzene and methane concentrations at 2-3 ft bls and 7-8 ft bls are presented in Plates 1 and 2, respectively. Detailed discussion for each test is presented below. 3.1 SVE-5 Test Results The baseline soil vapor sampling for the SVE-5 test occurred on May 18, The test was started on May 21, 2007 and completed on May 24, 2007, with a single ICE engine used for the test. Approximately one hour after the engine startup, the wellhead vacuum stabilized at an average of 3 in. w.c. with a flow rate of approximately 16 cfm. Overall, the methane equivalent of the extracted vapor showed a slight decline trend, with an average of 25,580 ppmv. The average of influent VOC concentrations (i.e., PID readings) was 222 ppmv. The SVE-5 test removed an estimated average of 1.04 pounds per hour (lbs/hour) of methane and 0.06 lbs/hour of VOCs. Based on the vacuum response at the soil gas monitoring points, the ROI for SVE-5 was estimated to be approximately 25 ft at 2-3 ft bls and 56 ft at 7-8 ft bls (Figure 6). As shown in Figure 11, the pilot test at SVE-5 (screened from 7 to 12 ft bls) resulted in a significant decrease of methane concentrations at 2-3 ft bls at two monitoring points (MP-SVE-6S and MP-6S). The SVE-5 test was less effective in reducing the methane concentrations at 7-8 ft bls (Figure 11). While the methane concentration soil gas monitoring point MP-SVE-6I (located approximately 35 ft northwest from SVE-5) was reduced from 75,500 ppmv to 1,310 ppmv; the methane concentration at MP-6D (located approximately 35 ft southeast from SVE-5) increased from 118,000 to 137,000 ppmv. The reduced level of ROUX ASSOCIATES, INC MC17230Y21.906/R

12 effectiveness at the 7 to 8 ft bls interval is believed to be attributable to the shallower screened interval of SVE-5. At the depth of 2-3 ft bls, the baseline benzene concentration at MP-SVE-1S (located approximately 120 ft away and across Apollo Street from SVE-5) was 201,000 ppbv May 18, At the end of the test on SVE-5, benzene concentration at MP-SVE-1S decreased to 86,900 ppbv on May 24, SVE-4 Test 1 Results The first test on SVE-4 (SVE-4 Test 1) was performed using a single ICE engine from May 29, 2007 to June 1, The subsurface methane concentrations remained at similar levels at 2-3 ft bls prior to the SVE-4 test (Figure 12), compared to that of the post SVE-5 test, even after 5 days of shut-down period. This indicated a slower rebound in shallow vapor concentrations following mitigation. However, after the 5 day shut-down period the methane concentration at 7-8 ft bls had fully rebounded to pre-sve-5 test levels. The quicker rebound at the 7 to 8 ft bls interval is likely attributable to the greater depth and closer proximity to the free product. The average wellhead vacuum of the test on SVE-4 was approximately 8 in. w.c. with a flow rate of approximately 15 cfm. Overall, the methane equivalent of extracted vapor showed a slight decline trend during the test, with an average of 54,048 ppmv. The average influent PID readings was 154 ppmv. The SVE-4 test removed an average of 2.05 lbs/hour of methane and 0.04 lbs/hour of VOCs. The ROI for SVE-4 was estimated to be approximately 28 ft at 2-3 ft bls and 58 ft at 7-8 ft bls (Figure 7). As shown in Figure 12, the pilot test at SVE-4 resulted in a slight reduction in the methane concentrations at 2-3 ft bls within the vicinity of SVE-4. However, all of these points were already at concentrations less than 12,500 prior to the test. At 7-8 ft bls, there was reduction in methane concentrations at several nearby monitoring points, including MP-SVE-3I, MP-SVE-4I, MP-SVE-5I, MP-SVE-6I, and MP-11D. Based upon these reductions it was possible to infer the mitigation area for 7 to 8 ft bls interval as shown in Figure 12. ROUX ASSOCIATES, INC MC17230Y21.906/R

13 At 2-3 ft bls, the benzene concentration in soil monitoring point MP-SVE-1S (located approximately 100 feet and across Apollo Street from SVE-4) had a benzene concentration of 230,000 ppbv measured on May 29, At the end of SVE-4 test, benzene concentration at MP-SVE-1S decreased to 34,300 ppbv on June 1, SVE-4 Test 2 Results In order to improve the wellhead vacuum and air flowrate, a second test on SVE-4 (SVE-4 Test 2) was performed using two ICE engines from June 5, 2007 to June 8, The average wellhead vacuum during the second test on SVE-4 was increased from 8 to 17 in. w.c. with a flow rate of approximately 26 cfm (Table 2). Overall, the methane equivalent of extracted vapor showed a slight decline trend during the test, with an average of 54,414 ppmv (Table 2). The average influent PID readings were 287 ppmv. The second SVE-4 removed an average of 3.58 lbs/hour of methane and 0.12 lbs/hour of VOCs (Table 2). The ROI for the second SVE-4 test was estimated to be approximately 76 ft at 2-3 ft bls and 92 ft at 7-8 ft bls (Figure 8). Due to the two ICE engines, the second SVE-4 test achieved a much higher ROI as well as VOC and methane mass removal rate compared to first test on SVE-4. As shown in Figure 13, the second test on SVE-4 resulted in reducing the methane concentrations at 2-3 ft bls at soil gas monitoring points adjacent to SVE-4, including MP-SVE-4S, MP-SVE-5S, MP-SVE-6S, and MP-10S. At 7-8 ft bls, the methane concentrations adjacent to the SVE-4 well were also reduced, including MP-SVE-3I, MP-SVE-4I, MP-SVE-5I, MP-SVE-6I, and MP-11D. Based upon the pre and post test concentrations it was possible to delineate an area of mitigation at both the 2 to 3 ft bls and 7 to 8 ft bls depth intervals (Figure 13). While the extent of this area is not equidistant in all directions, in some directions it is greater than the ROI as estimated from the vacuum response data alone. The results of the second test on SVE-4 also indicated that the ROI extended to monitoring points across the street and under the adjacent existing building, which suggests that street utilities and existing building foundation did not have a significant adverse effect on the ROI. At depth of 2-3 ft bls, the benzene concentration at MP-SVE-6S (located approximately 90 feet and on the other side of the adjacent building) decreased from 188,000 ppbv on June 5, 2007 to 97.9 ppbv on June 8, ROUX ASSOCIATES, INC MC17230Y21.906/R

14 3.4 SVE-6 Test Results The test on SVE-6 was performed using two ICE engines from June 11, 2007 to June 14, In general, the SVE-6 test results are fairly similar to that of the second test on SVE-4. The average wellhead vacuum of SVE-6 test was 17 in. w.c., with a flow rate of approximately 26 cfm (Table 3). Overall, the methane equivalent of extracted vapor showed a slight decline trend during the test, with an average of 51,880 ppmv (Table 2). The influent PID readings were 219 ppmv. The SVE-6 Test removed an average of 3.41 lbs/hour of methane and 0.09 lbs/hour of VOCs (Table 2). The ROI for SVE-6 was estimated to be approximately 56 ft at 2-3 ft bls and 108 ft at 7-8 ft bls (Figure 9). As shown in Figure 14, the test on SVE-6 resulted in reducing the methane concentrations at 2-3 ft bls at soil gas monitoring points adjacent to SVE-6. At 7-8 ft bls, the methane concentrations adjacent to the SVE-6 well were reduced significantly, including MP-SVE-6I, MP-SVE-7I, MP-SVE-9I, and MP-6D (Figure 14). At both depth intervals it was possible to delineate an area of mitigation. The extent of this area is generally slightly greater than the ROI as estimated from the vacuum response data alone. The test on SVE-6 also resulted in a decrease of benzene concentrations at depths 2-3 ft bls and 7-8 ft bls for most soil gas monitoring points located within the ROI (Plates 1 and 2). 3.5 SVE-3 Test Results The test on SVE-3 was performed using two ICE engines from June 18, 2007 to June 21, Compared to the tests on SVE 4 and SVE-6, the test on SVE-3 exhibited a slightly lower wellhead vacuum but at slightly higher air flowrates, most likely due to more permeable subsurface formation conditions at the SVE-3 location. The more permeable subsurface is consistent with the field observations and results noted during the first phase of the SVE pilot study. The average wellhead vacuum during the test on SVE-3 was 14 in. w.c., with a flow rate of approximately 35 cfm (Table 3). Overall, the methane equivalent of extracted vapor showed a slight decline trend during the test, with an average of 41,399 ppmv (Table 2). The average influent PID readings were 462 ppmv. The test on SVE-3 removed an average of 3.67 lbs/hour of methane and 0.26 lbs/hour of VOCs (Table 2). The ROI for the SVE-3 test was estimated to be approximately 88 ft at 2-3 ft bls and 120 ft at 7-8 ft bls (Figure 10). ROUX ASSOCIATES, INC MC17230Y21.906/R

15 As shown in Figure 15, the test on SVE-3 resulted in a reduction of the methane concentrations at 2-3 ft bls at most soil gas monitoring points adjacent to SVE-3 with the exception of MP-SVE-10S. At 7-8 ft bls, the methane concentrations adjacent to the SVE-3 were also reduced significantly. At both depth intervals, it was possible to delineate an area of mitigation. The extent of this area is generally slightly greater than the ROI as estimated from the vacuum response data alone. The test on SVE-3 test also resulted in a decrease of benzene concentrations at depth 2-3 ft bls and 7-8 ft bls for most soil gas monitoring points located within the ROI (Plates 1 and 2). 3.6 ICE Performance Data In addition to the SVE well wellhead vacuums and flowrates, the hourly and cumulative makeup propane usage was calculated and plotted on Figure 16 for the ICE engines. Regression equations are also presented on Figure 16 for estimation of makeup fuel usage during long-term operation of SVE operation. The results are summarized below: During the test on SVE-5, the total propane usage was approximately 550 pounds, corresponding to 9 lbs/hour of propane usage; During the first test on SVE-4, the total propane usage was approximately 310 pounds, corresponding to 4.5 lbs/hour of propane usage; and During second test on SVE-4, test on SVE-6 and SVE-3, the total propane usage was approximately 950 pounds per test, corresponding to 22 lbs/hour of propane usage (for two ICE engines). During each individual SVE test, SVE influent and effluent samples were taken from the sampling ports of ICE influent and effluent (stack off-gas). One SVE influent sample was taken two hours after the startup of each SVE test. At the end of each SVE test, one SVE influent and one SVE effluent sample were taken from the ICE engine. Samples were sent to AccuTest for analysis of VOCs using United States Environmental Protection Agency (USEPA) Method TO-15 and for methane using USEPA Method TO-3. A summary of influent and effluent concentrations for SVE Tests is presented in Table 3. In addition, the VOC concentrations of ICE effluent (stack offgas) were monitored every two hours using a multigas meter (MultiRAE Plus). As summarized in Table 2, the PID readings were zero for each ICE engine during the pilot study. ROUX ASSOCIATES, INC MC17230Y21.906/R

16 Based upon the influent and effluent analytical results, the average methane destruction and removal efficiency (DRE) was approximately 98.6 percent and the average benzene DRE was approximately 99.6 percent. ROUX ASSOCIATES, INC MC17230Y21.906/R

17 5.0 CONCEPTUAL VAPOR MITIGATION PLAN This section discusses the rationale and objectives for the vapor mitigation plan, the conceptual design, and schedule for implementation. 5.1 Rationale and Objectives The results of the previous soil vapor investigations identified that the shallow soil vapor (i.e., less than 8 ft bls) at and near the intersection of Apollo Street, Bridgewater Street and Norman Avenue contains methane and benzene at concentrations exceeding site-specific soil vapor screening criteria. Supplemental soil vapor sampling, ambient air sampling, screening of utility manholes and screening and sampling of indoor air have been conducted throughout this area. The results of this work have continued to show that the soil vapor conditions attributable to the free product plume are not impacting indoor air and subsurface utilities. In conjunction with the supplement investigation work described above, a pilot-testing program was also undertaken to evaluate the feasibility of using SVE and bioventing as possible mitigation options. The results of the pilot testing indicate that that SVE can be effective for mitigation of the soil vapor concentrations in this area, and sufficient data information has been collected to proceed with design of a full-scale system. While the results of the investigation work have continued to show that the soil vapor conditions attributable to the free product plume are not impacting indoor air and subsurface utility manholes, it is still recommended to proceed with design and implementation of a full-scale mitigation system as a proactive and protective measure. The goal of the mitigation system will be to reduce methane concentrations in the 2 to 3 ft bls interval to less than 12,500 ppm and to reduce concentrations in the 7 8 ft bls interval to less than 50,000 ppm. In addition, the goal is to reduce benzene to below 170,000 ppb in both the 2 to 3 and 7 to 8 ft bls intervals. As shown in the Figures 11 through 15, and Plate 1, this level of mitigation has been achievable in the vicinity of the individual pilot test SVE wells during the conduct of 72-hour tests at each well. ROUX ASSOCIATES, INC MC17230Y21.906/R

18 5.2 Proposed SVE System The SVE wells for the full-scale SVE system will be sized to achieve a wellhead vacuum of approximately 16 in. w.c. with a flowrate of 30 cfm using a screen interval of ft bls. Based on the results of the first and second phases of the SVE pilot study and to achieve the remedial goals, the conceptual layout of the full-scale system will consist of seven SVE wells screened from 13 to 18 ft bls (four new SVE wells [SVE-7 to SVE-10] and three existing SVE wells SVE-3, SVE-4 and SVE-6). The location of the proposed and existing SVE wells is shown on Figure 17. Each SVE well will be designed for a flow rate of 30 cfm and 16 in. w.c. for a total flow rate of 210 cfm. Based upon the vacuum response observed in the pilot test results, a minimum radius of influence of approximately 90 to 120 feet is expected for each well as shown in Figure 17. Also shown are the approximate areas where methane exceeds the mitigation goal at the 2 to 3 and 7 to 8 ft bls intervals. As described in the pilot test results, the effective radius of influence (the area where the SVE resulted in reduced vapor concentrations) typically extended beyond the 90 to 120 foot range. When operating in concert, it is anticipated that the effective radius influence will be further enhanced such that the network of SVE wells shown in Figure 17 will provide effective mitigation of soil vapor in the target area. The SVE wells will be manifolded together to a common header that is routed to a centralized vapor extraction and treatment system. A subsurface pre-cast concrete well vault will be installed at each SVE well location. The well vault will house vacuum gauges, valve, sample port and flow meter. The full-scale design process is currently underway. A design package is being prepared for submission to the NYSDEC as well as for the New York City Department of Transportation (NYCDOT). The proposed location of the treatment system compound for blowers, piping, controls, and associated off-gas treatment is being investigated and is dependent on property access issues and space. Although the ICE achieved DREs of up to 99%, the thermal off-gas treatment alternatives (ICE and thermal oxidation) are being further evaluated in the design process based upon the completed pilot test results to ensure that the off-gas treatment satisfies the Division of Air Resources (DAR-1) permissible discharge limits and is cost effective for long term operation. ROUX ASSOCIATES, INC MC17230Y21.906/R

19 5.3 Preliminary Implementation Schedule The following implementation schedule has been developed: Soil Vapor Mitigation Design Ongoing through November 2007; Property Access and Permitting Process with NYC Agencies and NYSDEC September 2007 through February 2008; Equipment Procurement December 2007 through February 2008; Construction February 2008 through June 2008; System Startup August The above schedule is preliminary and contingent upon property access and regulatory approvals. If property access and regulatory approvals are obtained quicker it may possible expedite the above process. In addition, once the SVE wells and piping are installed within the public right of way and routed to the treatment location, it may be possible to expedite the startup schedule by using a temporary ICE treatment system until construction the of final treatment system compound is complete. ROUX ASSOCIATES, INC MC17230Y21.906/R

20

21 4.0 PHASE II PILOT TEST CONCLUSIONS As discussed in Section 1.0, the second phase of the pilot study addressed the design issues from the first phase of the pilot study. The following conclusions were determined based upon an evaluation of the data generated during the SVE pilot study. The vacuum response data indicates that a ROI of between 55 and 88 feet at 2-3 ft bls as well as between 92 and 120 feet at 7-8 ft bls can be achieved consistently under a wellhead vacuum of 14 to 17 in. w.c. and SVE flow rates of 26 to 35 cfm. The pre- and post-test soil vapor sampling results indicate the effective area of mitigation will not be equidistant in all directions. The extent of the mitigation area may extend slightly beyond the ROI as estimated solely from the vacuum response data. The pilot study results indicated that street utilities and existing building foundation had only a minimal short-circuiting impact on the effective ROI of the SVE wells that are screened at depth from 13 to 18 feet bls. The screen depth of 13 to 18 ft bls was confirmed to be more effective than a shallow screen interval of 7 to 8 ft bls. The average methane DRE was approximately 98.6 percent. The average benzene DRE was approximately 99.6 percent. While running two ICEs in parallel, the SVE wells removed an average of 3.5 lbs/hour of methane and 0.15 lbs/hour of VOCs. When running the two ICEs in parallel, the influent concentrations did decline significantly following test startup but then appeared to approach steady-state conditions by the end of the 72-hour testing period. Methane concentrations in the extracted vapor at startup and conclusion of the three two-engine tests were: 60,700 versus 19,900 ppmv at SVE-4; 173,000 versus 32,600 ppmv at SVE-6; and 151,000 versus 54,300 ppmv at SVE-3. Along with the reduction in the influent methane concentrations there was an increase in the make-up propane usage required to run the ICEs. The amount of propane usage in each test appeared to stabilize at approximately 22 lbs/hour by the end of each 72-hour two engine test. ROUX ASSOCIATES, INC MC17230Y21.906/R

22 6.0 REFERENCES Roux Associates, Inc., Scope of Work for Proposed Investigation Activities, Off-Site Soil Vapor Investigation, Greenpoint, Brooklyn, New York. Roux Associates, Inc., 2006a. February 6, Soil Vapor Investigation Report, Greenpoint, Brooklyn, New York. Roux Associates, Inc., 2006b. November 10, Phase IV Soil Vapor Investigation Report, Greenpoint, Brooklyn, New York. Roux Associates, Inc., 2006c. SVE Pilot Study Work Plan, Greenpoint, Brooklyn, New York. Roux Associates, Inc., 2007a. Soil Vapor Extraction/Bioventing Pilot Study Summary Report, Greenpoint, Brooklyn, New York. Roux Associates, Inc., 2007b. Biannual Soil Vapor Sampling First Quarter 2007, Off-Site Commercial/Industrial and Residential Area, Greenpoint, Brooklyn, New York. ROUX ASSOCIATES, INC MC17230Y21.906/R

23 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter Sample Designation: MP-1S MP-1S MP-1S MP-1S MP-2D MP-2D MP-2D MP-2D MP-2S MP-2S MP-2S (Concentrations in ppbv) Sample Date: 6/11/2007 6/14/2007 6/18/2007 6/21/2007 5/18/2007 5/29/2007 6/18/2007 6/21/2007 5/18/2007 5/29/2007 6/1/2007 1,2,4-Trimethylbenzene 480 U 210 U 2.5 U 8 U 4.8 U 1,3,5-Trimethylbenzene 480 U 210 U 2.5 U 8 U 4.8 U 2-Butanone (MEK) 480 U 210 U 2.5 U 8 U 4.8 U 4-Ethyltoluene 480 U 210 U 2.5 U 8 U 4.8 U Acetone 480 U 210 U 2.5 U 8 U 4.8 U Benzene U Carbon disulfide 480 U 210 U 2.5 U 8 U 4.8 U Chloroform 480 U 210 U 2.5 U 8 U 4.8 U cis-1,2-dichloroethene 480 U 210 U 2.5 U U Cyclohexane U 8 U 4.8 U Ethanol 1200 U 530 U 6.3 U 20 U 12 U Ethylbenzene 150 U 480 U U J 4.8 U Freon U 210 U 2.5 U 8 U 4.8 U Heptane U 8 U 12.4 Hexane Isooctane 480 U 210 U 2.5 U 8 U 4.8 U m+p-xylene 480 U J Methylene chloride 480 U U 8 U 4.8 U MTBE 300 U 480 U 300 U 300 U 360 U 210 U 300 U 300 U U 4.8 U o-xylene 480 U J 5.1 J 4.8 U Propylene 1200 U 530 U 6.3 U 20 U 12 U t-butyl Alcohol 1500 U 480 U 1500 U 1500 U 1800 U 210 U 1500 U 1500 U U 4.8 U Tetrachloroethene 480 U 210 U Toluene 150 U 480 U 150 U 150 U U J 4.8 U Trichloroethene 480 U 210 U Trichlorofluoromethane 480 U 163 J U 3.5 J Xylenes (total) U U J (Concentrations in ppmv) Methane E 7420 E E 15 U E 8000 E 6820 E 3250 E 6 U 5790 E 501 Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limit J - Estimated value U - Indicates compound was analyzed for but not detected - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 1 of 33 MC17230Y21.906/T1.WKB

24 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-2S MP-2S MP-2S MP-5D MP-5D MP-5D MP-5D MP-5D MP-5D MP-5D MP-5S 6/11/2007 6/18/2007 6/21/2007 5/18/2007 5/24/2007 5/29/2007 6/11/2007 6/14/2007 6/5/2007 6/8/2007 5/18/ U 1.4 J 4.8 U U 1.8 U 4.8 U 0.94 J 4.8 U 1.8 U U E E U 1.8 U 4.8 U 1.8 U 4.8 U 1.8 U U 4.4 U U 150 U 50 U 50 U 50 U 150 U 150 U 150 U 150 U U 1.8 U U 1.8 U U 1.8 U 4.8 U 300 U 300 U 100 U 100 U 100 U 300 U 300 U 300 U 300 U U U 4.4 U 4.8 U 1500 U 1500 U 500 U 500 U 500 U 1500 U 1500 U 1500 U 1500 U U 150 U U U 150 U 150 U U 4.3 J 1.7 J U 300 U E E E E E E E 97.3 Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limit J - Estimated value U - Indicates compound was analyzed for but not detected - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 2 of 33 MC17230Y21.906/T1.WKB

25 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-5S MP-5S MP-5S MP-5S MP-5S MP-5S MP-6D MP-6D MP-6D MP-6D MP-6D 5/24/2007 5/29/2007 6/5/2007 6/8/2007 6/11/2007 6/14/2007 5/18/2007 5/24/2007 5/29/2007 6/1/2007 6/5/ U U 12 U 4.8 U U U 12 U 4.8 U U 1.8 U 120 U 12 U 4.8 U 4.8 U 4 U 1.8 U 120 U 12 U 4.8 U 3.2 J 4 U 1.8 U 120 U 12 U 4.8 U 4.8 U E E U 1.8 U 120 U 12 U 4.8 U 4.8 U 4 U 1.8 U 120 U 12 U 4.8 U 4.8 U 4 U 1.8 U 120 U 12 U 4.8 U 4.8 U U 4.6 U 300 U 30 U 12 U 12 U U 7 J 4.8 U U 56 U 50 U U 1.8 U 120 U 12 U 4.8 U 4.8 U 4 U J U 1.8 U 120 U 12 U 4.8 U 4.8 U U 11.1 J 4.8 U U 1.8 U 120 U 12 U 4.8 U 4.8 U U 120 U 12 U 4.8 U 4.8 U 100 U 110 U 100 U 300 U 300 U U 12 U 4.8 U U 4.6 U 300 U 30 U 12 U 12 U U 120 U 12 U 4.8 U 4.8 U 500 U 560 U 500 U 1500 U 1500 U U J 120 U 12 U 4.8 U 4.5 J 50 U 56 U 50 U 150 U 150 U 4 U 1.8 U 120 U 12 U 4.8 U 4.8 U 2.6 J 1.6 J 120 U 12 U 4.8 U 4.8 U U 11.1 J 4.8 U U E E E E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limit J - Estimated value U - Indicates compound was analyzed for but not detected - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 3 of 33 MC17230Y21.906/T1.WKB

26 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-6D MP-6D MP-6D MP-6D MP-6D MP-6S MP-6S MP-6S MP-6S MP-6S MP-6S 6/8/2007 6/11/2007 6/14/2007 6/18/2007 6/21/2007 5/18/2007 5/24/2007 5/29/2007 6/1/2007 6/5/2007 6/8/ U 4.4 U 4.5 U 2.1 J 4.8 U 12 U 4.8 U 60 U 4.4 U 4.5 U U 12 U 4.8 U 60 U 4.4 U 4.5 U 4.6 U 4.8 U 12 U 4.8 U 60 U 4.4 U 4.5 U 3.2 J 4.8 U 12 U 4.8 U 60 U 4.4 U 4.5 U 4.6 U 4.8 U 12 U 4.8 U J J 60 U 4.4 U 4.5 U 4.6 U 4.8 U 12 U 4.8 U 60 U 4.4 U 4.5 U 4.6 U 4.8 U 12 U 4.8 U 60 U 4.4 U 4.5 U 4.6 U 4.8 U 12 U 4.8 U U U U 11 U 11 U 12 U 12 U 30 U 12 U 150 U 150 U 60 U U U 6.1 J 3.6 J 60 U 4.4 U 4.5 U 4.6 U 4.8 U 12 U 4.8 U U 4.4 U 4.5 U 4.6 U 4.8 U 12 U 4.8 U U 9.6 J 4 J 60 U 4.4 U 4.5 U 4.6 U 4.8 U 12 U 4.8 U 300 U 300 U 60 U 300 U 300 U 4.4 U U 4.8 U 12 U 4.8 U 40.3 J 4.4 U J 4.8 U 12 U 4.8 U 150 U 11 U 11 U 12 U 12 U 30 U 12 U 1500 U 1500 U 60 U 1500 U 1500 U 4.4 U U 4.8 U 12 U 4.8 U 60 U U 150 U 60 U 150 U 150 U 4.4 U J 4.8 U 12 U 4.8 U 60 U 4.4 U 4.5 U 4.6 U 4.8 U 12 U 4.8 U 60 U 4.4 U 4.5 U 4.6 U 4.8 U 12 U 4.8 U U U 9.6 J 4 J E E 6520 E 7290 E E E 571 Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limit J - Estimated value U - Indicates compound was analyzed for but not detected - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 4 of 33 MC17230Y21.906/T1.WKB

27 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-6S MP-6S MP-6S MP-6S MP-7D MP-7D MP-7D MP-7D MP-7S MP-7S MP-7S 6/11/2007 6/14/2007 6/18/2007 6/21/2007 6/5/2007 6/8/2007 6/11/2007 6/18/2007 5/18/2007 5/29/2007 6/5/ U 4.8 U 600 U 88 U 400 U 48 U 4.8 U 4.8 U 600 U 88 U 400 U 48 U U 600 U 88 U 400 U 48 U 4.8 U 4.8 U 600 U 88 U 400 U 48 U 4.8 U 4.8 U 600 U 88 U 400 U 48 U 3.4 J 4.8 U 150 U J U 4.8 U 600 U 88 U 400 U 48 U 4.8 U 4.8 U 600 U 88 U 400 U 48 U 4.8 U 4.8 U 600 U 88 U 400 U 48 U U U 12 U 1500 U 220 U 1000 U 120 U 4.8 U 4.8 U 150 U 150 U 150 U 600 U U 88 U 400 U 48 U 4.8 U 4.8 U 600 U 88 U 400 U 48 U U J U U 4.8 U 600 U 88 U U 3.4 J 4.8 U 569 J 88 U 400 U 48 U 4.8 U 4.8 U 600 U 88 U 400 U 48 U 4.8 U 4.8 U 300 U 300 U 300 U 600 U 300 U 300 U 88 U 400 U 48 U 4.8 U 4.8 U 600 U U 48 U 12 U 12 U 1500 U 220 U 1000 U 120 U 4.8 U 4.8 U 1500 U 1500 U 1500 U 600 U 1500 U 1500 U 88 U 400 U 48 U J 600 U 88 U 400 U 48 U 4.8 U 4.8 U 150 U 150 U 150 U 600 U 150 U 150 U 88 U 400 U 48 U 4.8 U 4.8 U 600 U 88 U 400 U 48 U 4.8 U 4.8 U 600 U 88 U 400 U 48 U 3.4 J 4.8 U 300 U 300 U J U 48 U U E E E E E E 8360 E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limit J - Estimated value U - Indicates compound was analyzed for but not detected - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 5 of 33 MC17230Y21.906/T1.WKB

28 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-7S MP-7S MP-7S MP-7S MP-9D MP-9D MP-9S MP-9S MP-10D MP-10D MP-10D 6/8/2007 6/11/2007 6/18/2007 6/21/2007 6/18/2007 6/21/2007 6/18/2007 6/21/2007 5/18/2007 5/29/2007 6/1/ U 240 U 120 U 240 U 120 U 240 U 120 U 240 U 120 U 240 U U 150 U U E E E 120 U 240 U 120 U 240 U 120 U 240 U U 600 U 120 U 240 U 150 U U 150 U U 240 U U 240 U 120 U 240 U 120 U 240 U 120 U 240 U 300 U 300 U 300 U 300 U 300 U 300 U 100 U 100 U 300 U 120 U 240 U 300 U 600 U 120 U 240 U 1500 U 1500 U 1500 U 1500 U 1500 U 1500 U 500 U 500 U 1500 U 120 U 240 U 120 U 240 U 150 U 150 U 150 U 150 U 150 U 150 U U 240 U 120 U 240 U 120 U 240 U U 300 U E E E E E E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limit J - Estimated value U - Indicates compound was analyzed for but not detected - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 6 of 33 MC17230Y21.906/T1.WKB

29 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-10D MP-10D MP-10D MP-10D MP-10D MP-10D MP-10S MP-10S MP-10S MP-10S MP-10S 6/5/2007 6/8/2007 6/11/2007 6/14/2007 6/18/2007 6/21/2007 5/18/2007 5/29/2007 6/1/2007 6/5/2007 6/8/ U 4.8 U 60 U 4.8 U 32 U 4.8 U 60 U 4.8 U 32 U 4.8 U 60 U 4.8 U 32 U 4.8 U 60 U 4.8 U 32 U 4.8 U 60 U E E E E E 150 U U U 4.8 U 60 U 4.8 U 32 U 4.8 U 60 U 4.8 U 32 U 4.8 U 60 U 4.8 U U U 12 U 150 U 12 U U U U 4.8 U 60 U 2.7 J 32 U 4.8 U 60 U 4.8 U U U U 4.8 U 60 U 4.8 U 32 U 4.8 U 60 U 3.2 J 32 U 4.8 U 60 U 4.8 U 300 U 300 U 300 U 300 U 300 U 300 U 120 U 32 U 4.8 U 60 U 4.8 U 32 U 4.8 U 60 U 4.8 U 80 U 12 U 150 U 12 U 1500 U 1500 U 1500 U 1500 U 1500 U 1500 U 580 U 32 U 4.8 U 60 U 4.8 U 32 U 4.8 U 60 U 4.8 U U 58 U 32 U 4.8 U 60 U 4.8 U 32 U 4.8 U 60 U 4.8 U 32 U 4.8 U 60 U 4.8 U U U 4.8 U 60 U 3.2 J E E E E E E E 2170 E E 210 Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limit J - Estimated value U - Indicates compound was analyzed for but not detected - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 7 of 33 MC17230Y21.906/T1.WKB

30 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-10S MP-10S MP-10S MP-10S MP-11D MP-11D MP-11D MP-11D MP-11D MP-11D MP-11D 6/11/2007 6/14/2007 6/18/2007 6/21/2007 5/18/2007 5/29/2007 6/1/2007 6/5/2007 6/8/2007 6/11/2007 6/14/ U 4.8 U 60 U 60 U 4.8 U U 4.8 U 60 U 60 U 4.8 U 60 U 60 U 4.8 U 60 U U E E U 4.8 U U 4.8 U 60 U 60 U 4.8 U 60 U U 12 U 150 U 60 U U 150 U U U 4.8 U 60 U U 4.8 U 60 U 60 U U 4.8 U 60 U 60 U 4.8 U 300 U 300 U 100 U 100 U 300 U 300 U 35.2 J 300 U 300 U 60 U 4.8 U U 12 U 356 J 60 U 4.8 U 1500 U 1500 U 500 U 500 U 1500 U 1500 U 60 U 1500 U 1500 U 60 U 4.8 U 60 U 60 U 4.8 U 150 U 150 U J U 4.8 U 60 U 60 U 4.8 U 60 U 60 U U 300 U E U E E E E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limit J - Estimated value U - Indicates compound was analyzed for but not detected - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 8 of 33 MC17230Y21.906/T1.WKB

31 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-11D MP-11D MP-11S MP-11S MP-11S MP-11S MP-11S MP-11S MP-11S MP-11S MP-11S 6/18/2007 6/21/2007 5/18/2007 5/29/2007 6/1/2007 6/5/2007 6/8/2007 6/11/2007 6/14/2007 6/18/2007 6/21/ U 20 U 4.8 U U 4.8 U U 20 U 4.8 U U 4.8 U U 20 U 4.8 U 1.8 U 4.8 U 4.8 U U 20 U 4.8 U U 4.8 U U 20 U 4.8 U 1.8 U U U U U 150 U 4 U 20 U 4.8 U 1.8 U 4.8 U 4.8 U 4.8 U 4 U 20 U 4.8 U 1.8 U 4.8 U 4.8 U 4.8 U 4 U 20 U 4.8 U 1.8 U 4.8 U 4.8 U 4.8 U 4 U U U U 50 U 12 U 4.6 U 12 U 12 U 12 U U U 3.9 J U 150 U 4 U 20 U 4.8 U 1.8 U 4.8 U 4.8 U 4.8 U 4 U U U U J U 20 U 4.8 U 1.8 U 4.8 U 4.8 U 4.8 U U U 3.9 J U 20 U 4.8 U 1.8 U 4.8 U 4.8 U 4.8 U 100 U 300 U U 4.8 U 1.8 U 4.8 U 4.8 U 4.8 U 300 U 300 U U 4.8 U U 4.8 U U 50 U 12 U 4.6 U 12 U 12 U 12 U 500 U 1500 U U 4.8 U 1.8 U 4.8 U 4.8 U 4.8 U 1500 U 1500 U 4 U 20 U 4.8 U U 4.8 U 4.8 U U U U 4.8 U U 150 U 4 U 20 U 4.8 U 1.8 U 4.8 U 4.8 U 4.8 U 4 U 20 U 4.8 U 1.8 U 4.8 U 4.8 U 4.8 U U U U 3.9 J U 300 U E 9390 E U Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limit J - Estimated value U - Indicates compound was analyzed for but not detected - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 9 of 33 MC17230Y21.906/T1.WKB

32 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-1D MP-SVE-1D MP-SVE-1D MP-SVE-1D MP-SVE-1D MP-SVE-1D MP-SVE-1D 5/18/2007 5/24/2007 5/29/2007 6/1/2007 6/5/2007 6/8/2007 6/11/ E E E E E E U 110 U 100 U 300 U 300 U 300 U 300 U 500 U 560 U 500 U 1500 U 1500 U 1500 U 1500 U E E E E E E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limit J - Estimated value U - Indicates compound was analyzed for but not detected - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 10 of 33 MC17230Y21.906/T1.WKB

33 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter Sample Designation: MP-SVE-1D MP-SVE-1D MP-SVE-1D MP-SVE-1I MP-SVE-1I MP-SVE-1I MP-SVE-1I MP-SVE-1I MP-SVE-1I (Concentrations in ppbv) Sample Date: 6/14/2007 6/18/2007 6/21/2007 5/18/2007 5/24/2007 5/29/2007 6/1/2007 6/5/2007 6/8/2007 1,2,4-Trimethylbenzene 4500 U 1,3,5-Trimethylbenzene 4500 U 2-Butanone (MEK) 4500 U 4-Ethyltoluene 4500 U Acetone 4500 U Benzene E E E E E E E E Carbon disulfide 4500 U Chloroform 4500 U cis-1,2-dichloroethene 4500 U Cyclohexane Ethanol U Ethylbenzene Freon U Heptane Hexane Isooctane 4500 U m+p-xylene 5020 Methylene chloride 4500 U MTBE 300 U 300 U 300 U 4500 U 110 U 100 U 300 U 300 U 300 U o-xylene 4500 U Propylene U t-butyl Alcohol 1500 U 1500 U 1500 U 4500 U 550 U 500 U 1500 U 1500 U 1500 U Tetrachloroethene 4500 U Toluene J U 150 U 150 U Trichloroethene 4500 U Trichlorofluoromethane 4500 U Xylenes (total) E (Concentrations in ppmv) Methane E E E E E E E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 11 of 33 MC17230Y21.906/T1.WKB

34 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-1I MP-SVE-1I MP-SVE-1I MP-SVE-1I MP-SVE-1S MP-SVE-1S MP-SVE-1S MP-SVE-1S MP-SVE-1S 6/11/2007 6/14/2007 6/18/2007 6/21/2007 5/18/2007 5/24/2007 5/29/2007 6/1/2007 6/5/ J 2400 U 2400 U 2400 U E E E E U 2400 U 2400 U U U 58 U U 2400 U U U 300 U 300 U 300 U 300 U 2400 U 120 U 120 U 300 U 300 U 2400 U 6000 U 1500 U 1500 U 1500 U 1500 U 2400 U 580 U 580 U 1500 U 1500 U 2400 U 150 U 150 U 150 U 150 U 942 J 58 U 58 U 150 U 150 U 2400 U 2400 U U E E E E E E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 12 of 33 MC17230Y21.906/T1.WKB

35 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-1S MP-SVE-1S MP-SVE-1S MP-SVE-1S MP-SVE-1S MP-SVE-2D MP-SVE-2D MP-SVE-2D MP-SVE-2D 6/8/2007 6/11/2007 6/14/2007 6/18/2007 6/21/2007 6/11/2007 6/14/2007 6/18/2007 6/21/ E E E E U U 150 U U 300 U 300 U 300 U 300 U 300 U 300 U 300 U 300 U 1500 U 1500 U 1500 U 1500 U 1500 U 1500 U 1500 U 1500 U 1500 U 150 U 150 U 150 U 150 U 150 U U E E E E E E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 13 of 33 MC17230Y21.906/T1.WKB

36 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-2I MP-SVE-2I MP-SVE-2I MP-SVE-2I MP-SVE-2S MP-SVE-2S MP-SVE-2S MP-SVE-2S MP-SVE-3D 6/11/2007 6/14/2007 6/18/2007 6/21/2007 6/11/2007 6/14/2007 6/18/2007 6/21/2007 5/18/ U 2300 U U 24 U 2300 U 24 U 2300 U 24 U 2300 U E E E U U 24 U 2300 U 24 U 2300 U U 5700 U U J 24 U 2300 U U 2300 U U 2300 U 300 U 300 U 300 U 300 U 300 U 24 U 300 U 300 U 2300 U 24 U 2300 U 60 U 5700 U 1500 U 1500 U 1500 U 1500 U 1500 U 24 U 1500 U 1500 U 2300 U 24 U 2300 U 150 U 150 U 150 U 150 U 150 U 24 U U U 2300 U 24 U 2300 U U E E E E E E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 14 of 33 MC17230Y21.906/T1.WKB

37 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-3D MP-SVE-3D MP-SVE-3D MP-SVE-3D MP-SVE-3D MP-SVE-3D MP-SVE-3D MP-SVE-3D MP-SVE-3D 5/24/2007 5/29/2007 6/1/2007 6/11/2007 6/8/2007 6/11/2007 6/14/2007 6/18/2007 6/21/ U U U 300 U 120 U U 300 U E 120 U E U 300 U 120 U 300 U 120 U 300 U U 750 U 50 U 50 U U U 150 U U 300 U U 300 U U 300 U 100 U 100 U 120 U 300 U 300 U 300 U 300 U 300 U 300 U U 750 U 500 U 500 U 120 U 300 U 1500 U 1500 U 1500 U 1500 U 1500 U 120 U 300 U 50 U U 120 U 300 U 120 U 300 U E E E E E 6440 E E E 2030 Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 15 of 33 MC17230Y21.906/T1.WKB

38 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-3I MP-SVE-3I MP-SVE-3I MP-SVE-3I MP-SVE-3I MP-SVE-3I MP-SVE-3I MP-SVE-3I MP-SVE-3I 5/18/2007 5/24/2007 5/29/2007 6/1/2007 6/5/2007 6/11/2007 6/14/2007 6/18/2007 6/21/ U 120 U 2200 U 120 U 2200 U 120 U 2200 U 120 U 2200 U 120 U E E E U U 120 U 2200 U 120 U U 300 U 2200 U 50 U 50 U 120 U U U U 120 U U 120 U U 2200 U 120 U 2200 U 100 U 100 U 120 U 300 U 300 U 300 U 300 U 300 U 2200 U 120 U 5500 U 300 U 2200 U 500 U 500 U 120 U 1500 U 1500 U 1500 U 1500 U 1500 U 2200 U 120 U 1500 J 50 U U U U 2200 U 120 U 2200 U 120 U U U J E E E E E E E E 918 Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 16 of 33 MC17230Y21.906/T1.WKB

39 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-4I MP-SVE-4I MP-SVE-4I MP-SVE-4S MP-SVE-4S MP-SVE-4S MP-SVE-4S MP-SVE-4S MP-SVE-4S 6/14/2007 6/18/2007 6/21/2007 5/18/2007 5/24/2007 6/5/2007 6/14/2007 6/18/2007 6/21/ J 70 U 3.4 U 120 U 4.8 U U 3.4 U 120 U 4.7 J 4.8 U 70 U 3.4 U 120 U 4.8 U 4 J 70 U 3.4 U 120 U 4.8 U 4.8 U 70 U 3.4 U 120 U 4.8 U J U U 3.4 U 120 U 4.8 U 4.8 U 70 U 3.4 U 120 U U 70 U 3.4 U 120 U 4.8 U U 180 U 8.6 U 300 U 12 U U 70 U 2.3 J 120 U 3.1 J 150 U 150 U 4.8 U 70 U 3.4 U 120 U 4.8 U U 70 U 3.4 U 120 U 4.8 U U U U 70 U 3.4 U 120 U 4.8 U 4.8 U 300 U 300 U 70 U 3.4 U 120 U 4.8 U 300 U 300 U U 2 J 120 U 3.9 J 12 U 180 U 8.6 U 300 U 12 U 4.8 U 1500 U 1500 U 70 U 3.4 U 120 U 4.8 U 1500 U 1500 U 4.8 U 70 U 3.4 U 120 U 4.8 U U 70 U U U 150 U 4.8 U 70 U 3.4 U 120 U 4.8 U 4.3 J 70 U 2.3 J 120 U U 70 U U U 300 U E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 17 of 33 MC17230Y21.906/T1.WKB

40 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-5D MP-SVE-5D MP-SVE-5D MP-SVE-5D MP-SVE-5D MP-SVE-5D MP-SVE-5D MP-SVE-5D MP-SVE-5D 5/18/2007 5/29/2007 6/1/2007 6/5/2007 6/8/2007 6/11/2007 6/14/2007 6/18/2007 6/21/ J 380 J 600 U 516 J 600 U E E E E E E E E 600 U 600 U 600 U U U U U 110 U 100 U 600 U 300 U 300 U 300 U 300 U 300 U 300 U U 550 U 500 U 600 U 1500 U 1500 U 1500 U 1500 U 1500 U 1500 U 600 U U 600 U E E E E E E E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 18 of 33 MC17230Y21.906/T1.WKB

41 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-5I MP-SVE-5I MP-SVE-5I MP-SVE-5I MP-SVE-5I MP-SVE-5I MP-SVE-5I MP-SVE-5I MP-SVE-5I 5/18/2007 5/29/2007 6/1/2007 6/5/2007 6/8/2007 6/11/2007 6/14/2007 6/18/2007 6/21/ U 240 U 300 U 240 U 300 U 240 U 300 U 240 U 300 U 240 U E E U 300 U 240 U 300 U 240 U U 600 U U U U U 240 U U 240 U 300 U 240 U 300 U 240 U 110 U 100 U 300 U 300 U 300 U 300 U 240 U 300 U 300 U 300 U 240 U 750 U 600 U 550 U 500 U 1500 U 1500 U 300 U 1500 U 240 U 1500 U 1500 U 300 U 240 U U 150 U 240 U U 300 U 240 U 300 U 240 U U U U E E E E E E E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 19 of 33 MC17230Y21.906/T1.WKB

42 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-5S MP-SVE-5S MP-SVE-5S MP-SVE-5S MP-SVE-5S MP-SVE-5S MP-SVE-5S MP-SVE-5S MP-SVE-5S 5/18/2007 5/29/2007 6/1/2007 6/5/2007 6/8/2007 6/11/2007 6/14/2007 6/18/2007 6/21/ U 40 U 4.8 U 4.8 U 12 U U 40 U 4.8 U 4.8 U 12 U U 40 U 4.8 U 4.8 U 12 U 4.8 U 1100 U 40 U 4.8 U 4.8 U 12 U U 40 U 4.8 U 4.8 U 12 U 4.8 U U 12 U U 1100 U 40 U 4.8 U 4.8 U 12 U 4.8 U 1100 U 40 U 4.8 U 4.8 U 12 U 4.8 U 1100 U 40 U 4.8 U 4.8 U 12 U 4.8 U U U 100 U 12 U 12 U 30 U 12 U 1100 U U U 12 U U 150 U 1100 U 40 U 4.8 U 4.8 U 12 U 4.8 U J U 40 U 4.8 U 4.8 U 12 U 4.8 U 854 J J 4.8 U 12 U U 40 U 4.8 U 4.8 U 12 U 4.8 U 1100 U U 300 U 4.8 U 12 U 4.8 U 300 U 300 U 1100 U U 4.8 U 12 U U 100 U 12 U 12 U 30 U 12 U 1100 U U 1500 U 4.8 U 12 U 4.8 U 1500 U 1500 U 1100 U 40 U J U U U 12 U U 150 U 1100 U 40 U 4.8 U 4.8 U 12 U 4.8 U 1100 U 40 U 4.8 U 4.8 U 12 U 4.8 U 854 J J U 12 U U 300 U E U E 15 U Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 20 of 33 MC17230Y21.906/T1.WKB

43 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-6D MP-SVE-6D MP-SVE-6D MP-SVE-6D MP-SVE-6D MP-SVE-6D MP-SVE-6D MP-SVE-6D MP-SVE-6D 5/18/2007 5/24/2007 5/29/2007 6/1/2007 6/5/2007 6/8/2007 6/11/2007 6/14/2007 6/18/ J U U E E E U 12 U 12 U U 55 U 50 U 50 U 150 U 150 U U 150 U 150 U 12 U U U 110 U 100 U 100 U 300 U 300 U 12 U 300 U 300 U 300 U U 550 U 500 U 500 U 1500 U 1500 U 12 U 1500 U 1500 U 1500 U 12 U 55 U U 150 U U 150 U U 12 U U E E E 8810 E E E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 21 of 33 MC17230Y21.906/T1.WKB

44 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-6D MP-SVE-6I MP-SVE-6I MP-SVE-6I MP-SVE-6I MP-SVE-6I MP-SVE-6I MP-SVE-6I MP-SVE-6I 6/21/2007 5/18/2007 5/24/2007 5/29/2007 6/1/2007 6/8/2007 6/11/2007 6/14/2007 6/18/ U 60 U 4.8 U U 60 U 3.8 J 4.4 U 240 U 60 U 4.8 U U 60 U 4.8 U 4.4 U 240 U 60 U 4.8 U J 240 U 60 U 4.8 U 4.4 U 240 U 60 U 4.8 U 4.4 U 240 U 60 U 4.8 U U 150 U 12 U U U 60 U 150 U 4.1 J 150 U 4.4 U 240 U 60 U 4.8 U U 240 U 60 U 4.8 U U 60 U U 240 U 60 U 4.8 U 300 U 110 U 4.4 U 100 U 240 U 60 U 300 U 4.8 U 300 U U 60 U 4.8 U 11 U 600 U 150 U 12 U 1500 U 550 U 4.4 U 500 U 240 U 60 U 1500 U 4.8 U 1500 U 4.4 U 240 U 60 U 4.8 U 150 U 55 U U 240 U 60 U 150 U 4.8 U 150 U 4.4 U 240 U 60 U 4.8 U 4.4 U 240 U 60 U 4.8 U U 60 U 300 U E 1310 E E 5750 E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 22 of 33 MC17230Y21.906/T1.WKB

45 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-6I MP-SVE-6S MP-SVE-6S MP-SVE-6S MP-SVE-6S MP-SVE-6S MP-SVE-6S MP-SVE-6S MP-SVE-6S 6/21/2007 5/18/2007 5/24/2007 5/29/2007 6/1/2007 6/5/2007 6/8/2007 6/11/2007 6/14/ J 1.6 J 120 U 4.8 U 4.8 U 1100 U 1.3 J 120 U 4.8 U 4.8 U 1100 U 1.8 U 120 U 4.8 U 4.8 U 1100 U 1.8 U 120 U 4.8 U 4.8 U 1100 U 1.8 U 120 U 4.8 U 4.8 U 150 U U 1.8 U 120 U 4.8 U 4.8 U 1100 U 1.8 U 120 U 4.8 U 4.8 U 1100 U 1.8 U 120 U 4.8 U 4.8 U U 2800 U 4.5 U 300 U 12 U 12 U 150 U 1100 U 1.8 U 100 U 78.6 J 150 U U 4.8 U 1100 U 1.8 U 120 U 4.8 U 4.8 U U 1.8 U 120 U 4.8 U 4.8 U 940 J U 4 J U U 4.8 U 4.8 U 300 U 1100 U 1.8 U 200 U 120 U 300 U 4.8 U 300 U 4.8 U 1100 U 1.8 U 120 U 4.8 U 4.8 U 2800 U 4.5 U 300 U 12 U 12 U 1500 U 1100 U 1.8 U 1000 U 120 U 1500 U 4.8 U 1500 U 4.8 U 1100 U 1.8 U 120 U 4.8 U 4.8 U 150 U 560 J 1.2 J 100 U U 4.8 U 150 U 4.8 U 1100 U 1.8 U 120 U 4.8 U 4.8 U 1100 U 1.8 U 120 U 4.8 U 4.8 U 300 U 940 J U J E E E 15 U Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 23 of 33 MC17230Y21.906/T1.WKB

46 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-6S MP-SVE-6S MP-SVE-7D MP-SVE-7D MP-SVE-7D MP-SVE-7D MP-SVE-7D MP-SVE-7D MP-SVE-7D 6/18/2007 6/21/2007 5/18/2007 5/24/2007 5/29/2007 6/5/2007 6/8/2007 6/11/2007 6/14/ U U 267 J 300 U U E E E E E U 300 U 300 U U U U 300 U U U 300 U 300 U 110 U 110 U 200 U 300 U 300 U 300 U 300 U U 1500 U 1500 U 560 U 560 U 1000 U 1500 U 1500 U 300 U 1500 U 300 U 150 U 150 U 56 U 56 U U U 300 U 300 U U U E E E E E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 24 of 33 MC17230Y21.906/T1.WKB

47 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-7D MP-SVE-7D MP-SVE-7I MP-SVE-7I MP-SVE-7I MP-SVE-7I MP-SVE-7I MP-SVE-7I MP-SVE-7I 6/18/2007 6/21/2007 5/18/2007 5/24/2007 5/29/2007 6/1/2007 6/5/2007 6/8/2007 6/11/ U U 55 U 50 U 150 U 150 U 150 U 150 U 300 U 300 U 110 U 110 U 100 U 300 U 300 U 300 U 300 U 1500 U 1500 U 550 U 550 U 500 U 1500 U 1500 U 1500 U 1500 U 150 U U 55 U 50 U 150 U 150 U 150 U 150 U E E E 6390 E E E E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 25 of 33 MC17230Y21.906/T1.WKB

48 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-7I MP-SVE-7I MP-SVE-7I MP-SVE-7S MP-SVE-7S MP-SVE-7S MP-SVE-7S MP-SVE-7S MP-SVE-7S 6/14/2007 6/18/2007 6/21/2007 5/18/2007 5/24/2007 5/29/2007 6/1/2007 6/5/2007 6/8/ J 88 U U U J 88 U J U U 88 U 4.4 U 40 U 4.8 U 49 U 12 U 60 U 88 U U U U 88 U 4.4 U 40 U 4.8 U 49 U 12 U U 88 U 4.4 U 40 U 4.8 U 49 U 12 U 60 U 65.2 J J U 88 U 4.4 U 40 U 4.8 U 49 U 12 U U 220 U 11 U 100 U 12 U 120 U 30 U 60 U U 88 U J 4.8 U 49 U U 88 U 4.4 U 40 U 4.8 U 49 U 12 U U 88 U 4.4 U 40 U 4.8 U 49 U 12 U U J 4.8 U 49 U U 88 U U 4.8 U 49 U 12 U 60 U 300 U 300 U 88 U 4.4 U 40 U 4.8 U 49 U 12 U 58.4 J 88 U U 4.8 U 49 U U 220 U U 12 U 120 U 30 U 60 U 1500 U 1500 U 88 U 4.4 U 40 U 4.8 U 49 U 12 U 50.5 J 53.4 J U 88 U U 4.8 U 49 U U 88 U 4.4 U 40 U 4.8 U 49 U 12 U 60 U 88 U U 4.8 U 49 U 12 U U J 4.8 U 49 U E E 1980 E E E 661 Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 26 of 33 MC17230Y21.906/T1.WKB

49 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-7S MP-SVE-7S MP-SVE-7S MP-SVE-7S MP-SVE-8D MP-SVE-8D MP-SVE-8D MP-SVE-8D MP-SVE-8D 6/11/2007 6/14/2007 6/18/2007 6/21/2007 5/18/2007 5/29/2007 6/5/2007 6/11/2007 6/14/ U 12 U U 12 U U E U 12 U U 12 U U 30 U 30 U U 150 U 150 U U 12 U J 12 U 12 U U 12 U 12 U 12 U 12 U 300 U 300 U 110 U 200 U 300 U 300 U 300 U U 30 U 30 U 12 U 12 U 1500 U 1500 U 550 U 1000 U 1500 U 1500 U 1500 U U 150 U 150 U U 12 U 12 U 12 U U 170 J 210 J E E E E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 27 of 33 MC17230Y21.906/T1.WKB

50 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-8I MP-SVE-8I MP-SVE-8I MP-SVE-8I MP-SVE-8I MP-SVE-8S MP-SVE-8S MP-SVE-8S MP-SVE-8S 5/18/2007 5/29/2007 6/5/2007 6/11/2007 6/14/2007 5/18/2007 5/29/2007 6/5/2007 6/11/ U 1100 U 1100 U 1100 U 1100 U U 1100 U 1100 U U 55 U 100 U 150 U 150 U 150 U 1100 U 100 U 60 U 150 U 1100 U U 715 J 1100 U 110 U 200 U 300 U 300 U 300 U 1100 U 200 U 120 U 300 U 1100 U 2800 U 550 U 1000 U 1500 U 1500 U 1500 U 1100 U 1000 U 600 U 1500 U 1100 U 55 U 100 U 150 U 150 U 150 U 468 J 100 U 60 U 150 U 1100 U 1100 U J E E E E E E E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 28 of 33 MC17230Y21.906/T1.WKB

51 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-8S MP-SVE-9D MP-SVE-9D MP-SVE-9D MP-SVE-9D MP-SVE-9D MP-SVE-9D MP-SVE-9I MP-SVE-9I 6/14/2007 5/18/2007 5/29/2007 6/5/2007 6/11/2007 6/14/2007 6/5/2007 5/18/2007 5/29/ J U U 48 U 480 U 1100 U 48 U U 48 U 480 U 1100 U E E U 480 U 1100 U 48 U 480 U 1100 U 48 U 480 U 1100 U U 1200 U 2800 U 48 U 55 U U 150 U U 100 U 48 U 480 U 762 J U 480 U 1100 U U 48 U 480 U 1100 U 48 U 110 U 200 U 300 U 300 U 300 U 480 U 1100 U 200 U U 120 U 1200 U 2800 U 48 U 550 U 1000 U 1500 U 1500 U 1500 U 480 U 1100 U 1000 U 48 U 480 U 1100 U 48 U 55 U U 150 U J 100 U 48 U 480 U 1100 U 48 U 480 U 1100 U U E E E E E E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 29 of 33 MC17230Y21.906/T1.WKB

52 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-9I MP-SVE-9I MP-SVE-9I MP-SVE-9I MP-SVE-9S MP-SVE-9S MP-SVE-9S MP-SVE-9S MP-SVE-9S 6/5/2007 6/8/2007 6/11/2007 6/14/2007 5/18/2007 5/29/2007 6/5/2007 6/8/2007 6/11/ U 600 U 120 U U 30 U 260 U 300 U 60 U 600 U 600 U 80.5 J U 30 U 260 U 300 U 60 U 600 U 600 U 120 U 12 U 90 U 30 U 260 U 300 U 60 U 600 U 600 U 120 U U 30 U 260 U 300 U 60 U 600 U 600 U 120 U 12 U 90 U 30 U 260 U 300 U 60 U U 600 U 120 U 12 U 90 U 30 U 260 U 300 U 60 U 600 U 600 U 120 U 12 U 90 U 30 U 260 U 300 U 60 U 600 U 600 U 120 U 12 U 90 U 30 U 260 U 300 U 60 U U 1500 U 300 U 30 U 220 U 75 U 650 U 750 U 150 U 600 U 600 U 120 U 12 U 90 U 30 U 260 U 300 U 60 U 600 U 600 U 120 U 12 U 90 U 30 U 260 U 300 U 60 U U 600 U 120 U 12 U 90 U 30 U 260 U 300 U 60 U 577 J 565 J J U 300 U 60 U 600 U 600 U 120 U 12 U 90 U 30 U 260 U 300 U 60 U 600 U 600 U 120 U 12 U 90 U 30 U 260 U 300 U 60 U 600 U 600 U 120 U U 30 U 260 U 300 U 60 U 1500 U 1500 U 300 U 30 U 220 U 75 U 650 U 750 U 150 U 600 U 600 U 120 U 12 U 90 U 30 U 260 U 300 U 60 U 600 U 600 U 120 U 12 U 50.9 J 23.8 J 260 U 300 U 60 U 600 U 600 U 120 U U 30 U 260 U 300 U 60 U 600 U 600 U 120 U 12 U 90 U 30 U 260 U 300 U 60 U 600 U 600 U 120 U 12 U 90 U 30 U 260 U 300 U 60 U 577 J 565 J J U 300 U 60 U E E E E 4840 E E E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 30 of 33 MC17230Y21.906/T1.WKB

53 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-9S MP-SVE-10D MP-SVE-10D MP-SVE-10D MP-SVE-10D MP-SVE-10D MP-SVE-10D MP-SVE-10D 6/14/2007 5/29/2007 6/1/2007 6/5/2007 6/8/2007 6/11/2007 6/18/2007 6/21/ J 12 U 12 U 12 U E E E E E E 12 U 12 U 12 U U 12 U U U U 12 U 200 U 300 U 220 U 300 U 300 U 300 U 300 U U 12 U 1000 U 1500 U 1100 U 1500 U 1500 U 1500 U 1500 U 10.1 J 12 U 100 U 150 U 110 U 150 U 150 U 150 U 150 U 12 U 12 U E E E E E 15 U E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 31 of 33 MC17230Y21.906/T1.WKB

54 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-10I MP-SVE-10I MP-SVE-10I MP-SVE-10I MP-SVE-10I MP-SVE-10I MP-SVE-10S MP-SVE-10S 6/1/2007 6/5/2007 6/8/2007 6/11/2007 6/18/2007 6/21/2007 5/18/2007 5/29/ U 2300 U 2300 U 2300 U 2300 U U 2300 U 2300 U U 150 U 93 U 150 U 150 U 150 U 150 U 2300 U 150 U 2300 U U 2300 U 2300 U 300 U 190 U 300 U 300 U 300 U 300 U 2300 U 300 U 2300 U 5700 U 1500 U 930 U 1500 U 1500 U 1500 U 1500 U 2300 U 1500 U 2300 U 150 U 93 U 150 U 150 U 150 U 150 U 1030 J 150 U 2300 U 2300 U U E E E E E E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 32 of 33 MC17230Y21.906/T1.WKB

55 Table 1. Summary of Volatile Organic Compounds and Methane in Soil Vapor ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: MP-SVE-10S 6/1/ U 1500 U 150 U E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown ROUX ASSOCIATES, INC. Page 33 of 33 MC17230Y21.906/T1.WKB

56 Table 2. Summary of Phase II SVE Pilot Study Results, ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York. Test Period Pilot Test Screen Interval Number of ICE Engines Avg. Wellhead Vacuum Avg. Extracted Air Flowrate Total Flowrate 1 Avg. BTU/Hour Level of Extracted Air Avg. Methane Equivalent of Extracted Air Avg. SVE Influent PID Readings Avg. Stack Discharge PID Readings Avg. Methane Removal Rate 2 Avg. VOC Removal Rate ROI at 2-3 ft bls ROI at 7-8 ft bls ft bls (inch of w.c.) (scfm) (scfm) (BTU/Hour) (ppmv) (ppmv) (ppmv) (pounds/hour) (pounds/hour) (feet) (feet) 5/18/2007-5/24/2007 SVE /29/2007-6/1/2007 SVE-4 Test /5/2007-6/8/2007 SVE-4 Test /11/2007-6/14/2007 SVE /18/2007-6/21/2007 SVE Notes: 1 Total Flowrate equals the total of extracted Air, engine dilution air, and supplemental fuel (propane) flowrates. 2 Emission Rate ERi (lbs/hr) = Q (cfm) x Ci (ppmv) x MW x (1.581 x 10-7 ). MW of methane = 16, MW of Petroleum VOC = inch of w.c. - inch of water column; scfm - standard cubic feet per minute; ft bls - feet below land surface; ROI - radius of influence. ROUX ASSOCIATES, INC. 1 of 1 MC17230Y21.906/T2

57 Table 3. Summary of Influent and Effluent Concentrations for SVE Tests ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter Sample Designation: SVE-5 INFLUENT SVE-5 INFLUENT SVE-5 EFFLUENT SVE-4 INFLUENT SVE-4 INFLUENT (Concentrations in ppbv) Sample Date: 5/21/2007 5/24/2007 5/24/2007 5/29/2007 6/1/2007 1,2,4-Trimethylbenzene U 1,3,5-Trimethylbenzene 162 J 31 U 2-Butanone (MEK) 220 U 31 U 4-Ethyltoluene 220 U 31 U Acetone 220 U 31 U Benzene E Carbon disulfide 220 U 31 U Chloroform 220 U 31 U cis-1,2-dichloroethene 220 U 31 U Cyclohexane Ethanol 550 U 77 U Ethylbenzene U Freon U 31 U Heptane Hexane Isooctane 220 U 31 U m+p-xylene Methylene chloride 220 U 31 U MTBE 220 U 110 U U 300 U o-xylene Propylene 550 U 77 U t-butyl Alcohol 220 U 560 U 31 U 1000 U 1500 U Tetrachloroethene 220 U 31 U Toluene U Trichloroethene 220 U 31 U Trichlorofluoromethane 220 U 31 U Xylenes (total) (Concentrations in ppmv) Methane E E E 527 Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown SVE-6 Effluent 1 sampled on 6/14/07 was not used for destruction and removal efficiency (DRE) calculation due to abnormal high concentrati ROUX ASSOCIATES, INC. Page 1 of 5 MC17230Y21.906/T3.WKB

58 Table 3. Summary of Influent and Effluent Concentrations for SVE Tests ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: SVE-4 EFFLUENT SVE-4 INFLUENT1 SVE-4 INFLUENT2 SVE-4 EFFLUENT1 SVE-4 EFFLUENT2 6/1/2007 6/8/2007 6/8/2007 6/8/2007 6/8/ U 3.9 J 25.8 J 12 U 4.8 U 30 U 12 U 3.2 J U 4.8 U 30 U 12 U E E U 30 U 12 U 4.8 U 30 U 12 U 4.8 U 30 U 12 U U 75 U 30 U U 30 U 12 U U 30 U 12 U U 30 U 12 U 4.8 U 300 U 100 U 30 U 12 U U 12 U 75 U 30 U 4.8 U 1500 U 500 U 30 U 12 U 4.8 U 30 U 12 U U 30 U 12 U 4.8 U 30 U 12 U E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown SVE-6 Effluent 1 sampled on 6/14/07 was not used for destruction a ROUX ASSOCIATES, INC. Page 2 of 5 MC17230Y21.906/T3.WKB

59 Table 3. Summary of Influent and Effluent Concentrations for SVE Tests ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: SVE6 INFLUENT 1 SVE6 INFLUENT 1 SVE6 INFLUENT 2 SVE6 INFLUENT 2 SVE6 EFFLUENT 1 6/11/2007 6/14/2007 6/11/2007 6/14/2007 6/14/ E E U 300 U 300 U 300 U 300 U 1500 U 1500 U 1500 U 1500 U 1500 U E E E E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown SVE-6 Effluent 1 sampled on 6/14/07 was not used for destruction a ROUX ASSOCIATES, INC. Page 3 of 5 MC17230Y21.906/T3.WKB

60 Table 3. Summary of Influent and Effluent Concentrations for SVE Tests ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: SVE6 EFFLUENT 2 SVE 3 INFLUENT 1 SVE-3 INFLUENT 1 SVE 3 INFLUENT 2 SVE-3 INFLUENT 2 6/14/2007 6/18/2007 6/21/2007 6/18/2007 6/21/ U U E E E 12 U 12 U 12 U U U U U 12 U 300 U 300 U 300 U 300 U U 12 U 1500 U 1500 U 1500 U 1500 U 12 U U 12 U E E E E Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown SVE-6 Effluent 1 sampled on 6/14/07 was not used for destruction a ROUX ASSOCIATES, INC. Page 4 of 5 MC17230Y21.906/T3.WKB

61 Table 3. Summary of Influent and Effluent Concentrations for SVE Tests ExxonMobil Corporation, Greenpoint Remediation Project, Brooklyn, New York Parameter (Concentrations in ppbv) 1,2,4-Trimethylbenzene 1,3,5-Trimethylbenzene 2-Butanone (MEK) 4-Ethyltoluene Acetone Benzene Carbon disulfide Chloroform cis-1,2-dichloroethene Cyclohexane Ethanol Ethylbenzene Freon 113 Heptane Hexane Isooctane m+p-xylene Methylene chloride MTBE o-xylene Propylene t-butyl Alcohol Tetrachloroethene Toluene Trichloroethene Trichlorofluoromethane Xylenes (total) (Concentrations in ppmv) Methane Sample Designation: Sample Date: SVE-3 EFFLUENT 1 SVE-3 EFFLUENT 2 6/21/2007 6/21/ U 300 U 300 U 1500 U 1500 U 150 U 150 U U Notes: ppmv - Parts per million/volume ppbv - Parts per billion/volume E - Exceeds calibration limi J - Estimated value U - Indicates compound was analyzed for but not detecte - Not analyzed Only compounds which have one or more detections are shown SVE-6 Effluent 1 sampled on 6/14/07 was not used for destruction a ROUX ASSOCIATES, INC. Page 5 of 5 MC17230Y21.906/T3.WKB

62 BP AMOCO TERMIL NEWTOWN CREEK PHASE II SVE PILOT STUDY LOCATION FORMER PARAGON FACILITY (CURRENTLY PEERLESS IMPORTERS) RESIDENTAL AREA OFF-SITE SYSTEM BROOKLYN-QUEENS EXPRESSWAY EXPLATION BP AMOCO TERMIL FORMER PARAGON FACILITY EXTENT OF RESIDENTIAL AREA SVE PILOT STUDY LOCATION N Title: Prepared For: PHASE II SVE PILOT STUDY LOCATION GREENPOINT BROOKLYN, NEW YORK OFF-SITE PAHSE II SVE PILOT STUDY GREENPOINT, BROOKLYN, NEW YORK EXXONMOBIL REFINING & SUPPLY CO. INWOOD, NEW YORK Compiled by: K.T. Prepared by: C.P. ROUX ASSOCIATES INC Project Mgr: G.N. Environmental Consulting & Management File No: MC Date: 10JUL07 Scale: AS SHOWN Office: NEW YORK Project: 17230Y21 FIGURE 1

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