3. One of the objectives of the Site Assessment is to evaluate current exposure and potential risks of exposure to humans and the environment, including multiple pathways of exposure. The site assessment failed to include information on vapor intrusion and volatile organics being transported into homes in the residential areas, churches, businesses and the community center from Volatile Organic Chemicals (VOCs) in the shallow groundwater.
4. The VOCs in the shallow groundwater pose a risk to human health through inhalation. That exposure pathway must be evaluated as an important part of the site assessment.
5. Lockheed has acknowledged that although VOCs in the groundwater are a potential concern, inhalation is not considered to represent a significant exposure pathway because air concentrations are presumed to be low. Presumption of low concentrations of toxic chemicals is not acceptable.
6. Lockheed used the low concentrations presumption to omit the study of groundwater vapor intrusion into homes.
7. Lockheed used the lack of human exposure to groundwater contaminates to justify not considering relocation of residents since the community supposedly no longer uses individual water wells.
8. Lockheed failed to evaluate the vapor intrusion pathway of the toxic off gassing of VOCs into residential homes.
9. If the FDEP does not require the vapor intrusion pathway and indoor air quality to be investigated as a part of the Site Assessment, the Remedial Action Plan will fail to address a critical human health exposure pathway and continue to allow the community to be exposed to the toxic chemicals of concern.
10. The groundwater table beneath the residential area is less than 5 feet below the ground surface. Toxic volatile organic chemicals in excess of criterion are present in the shallow groundwater beneath the residential areas at depths of 0 to 30 feet below ground surface in the Upper Surficial Aquifer System and 35 to 45 feet below ground surface in the Lower Surficial Aquifer System.
11. The Upper Surficial Aquifer System groundwater 15 to 20 feet below ground level in the residential areas contains 1,4-Dioxane, PCE, TCE, cis-1,2-DCE, 1,1-DCE and 1,1-DCA in concentrations in excess of Screening Criteria.
12. The Lower Surficial Aquifer System groundwater 35 feet below the ground surface in the residential area contains 1,4-Dioxane, PCE, TCE, cis-1,2-DCE, 1,1-DCE and 1,1-DCA in excess of Screening Criteria.
13. FDEP must require that the transport of volatile organic chemicals from the shallow groundwater beneath the residential areas into the homes of people living on top of the groundwater plume and the human exposure pathway be evaluated as part of the Site Assessment.
14. It is critical to evaluate this human health pathway during the Site Assessment phase and not allow the Remedial Action phase to proceed until the magnitude and extent of human health exposure is defined.
15. This evaluation could lead to an additional recommendation in Section 5.2 of the Site Assessment Report that would require an evaluation of groundwater off gassing impacts to human health that could result in relocation of residential areas over the groundwater plume.
16. One of the significant findings of the Site Assessment Report is that the horizontal and vertical extent of COCs above GCTLs in site groundwater has been delineated. But the vertical extent of the groundwater contamination plume has not been determined for the entire plume area. There are not adequate wells below groundwater strata exceeding GCTLs throughout the plume to define the vertical extent of the plume.
17. Two other significant findings of the Site Assessment Report are that the vertical extent of chemicals of concern or COCs above GCTLs in site groundwater is limited to within approximately 200 feet below ground surface water and in the Lower Arcadian Formation Sands and Floridan Aquifer System is not impacted with site COCs above groundwater cleanup targeted levels.
18. These findings fail to present the fact that chemicals of concern have migrated into the Lower Arcadian Formation Sands and Floridan Aquifer System as documented by testing of the minimal number of monitoring wells installed in the two water bearing zones.
19. Chemicals of concern including TCE and PCE are present in groundwater formations deeper than 200 feet below ground surface and have been detected in groundwater to depths of 365 to 385 feet below ground surface.
20. Chemicals of concern have impacted the Lower Arcadian Formation Sands and the Floridan Aquifer System.
21. Samples of private water wells were collected and analyzed as part of the Site Assessment process. Lockheed made a decision to not include some of the results in the Site Assessment report and will submit the data to the DEP under separate cover. This is not acceptable.
22. The 2006 Private Well Survey Data that was submitted to DEP under separate cover on May 22 indicates that samples from several wells to the north and east of the Booth well showed contamination, yet those wells, in particular Well 98 on Trey Desenberg's property, arenot within the plume. This indicates that both the horizontal as well as vertical extent of the plume has not been defined and needs further study.
23. Test results of private wells not included in the Site Assessment contained concentrations of 1,4-Dioxane, TCE and cis-1,2-DCE in concentrations, in some cases, in excess of groundwater targeted cleanup levels.
24. Lockheed has suggested that these private wells were beyond the limits of site impacted groundwater and beyond monitoring wells which had non-detectable concentrations of the chemicals of concern found on the former American Beryllium Company site.
25. There are many individual plume maps for specific chemicals within the overall composite plume map. Examination of individual plume maps indicate that other plumes traced back to the plant may be contaminating those private wells.
26. The entire Private Water Well Data set must be required to be provided in the Site Assessment Report and the DEP must require that Lockheed do additional testing to delineate groundwater contamination outside the current plumes and determine if the source material for the plumes of the unreported private water wells are interconnected to the former beryllium facility plumes or originated from the former plant.
27. Only one on-site surface water sample has been collected and analyzed throughout the testing and evaluation phases of the former ABC facility site. No on-site or off-site sediment samples have been collected and tested for COCs. This constitutes a lack of data on which to fully characterize the former ABC facility site and the surrounding area known to be impacted by the contaminated groundwater plume.
28. Sediment sampling and analysis for COCs must be performed in order to complete the characterization needed to finalize the Site Assessment phase.
29. DEP should require a more proactive remedy than the cleanup strategies proposed by Lockheed in the site assessment. That proactive remedy should include: relocation, contaminated groundwater removal or bioremediation at hot spot areas in addition to the Interim Remedial Action, and removal of contaminated soil from on the industrial site and from the residential yards.
SOURCE: Wilma Subra, Subra Company, "Comments on Site Assessment Report Addendum 3, Former ABC Facility, Tallevast, Florida, submitted to DEP by Lockheed Martin on April 26."