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Annual Site Environmental Report for 1999 7. REFERENCES CH2M HILL 1991. Results of the Site Investigation, Phase I, Paducah Gaseous Diffusion Plant, Paducah, Kentucky, KY IER-4, CH2M HILL Southeast, Inc., Oak Ridge, TN. CH2M HILL 1992. Results of the Site Investigation, Phase II, Paducah Gaseous Diffusion Plant, Paducah, Kentucky, KY/SUBI 13B-97777C P-03/199111, CH2M HILL So~theast, Inc., Oak Ridge, TN, April. DOE (U.S. Department of Energy) 1995. Draft Northeast Plume Preliminary Characterization Summary Report, Paducah, Kentucky, DOE/ORl07-1339&DI, February 7. MMES (Martin Marietta Energy Systems, Inc.) 1992. Report of the Paducah Gaseous Diffusion Plant Groundwater Investigation Phase Ill, KYlE-ISO, Martin Marietta Energy Systems, Inc., Paducah, KY, November. APPENDIX A PLUME MAPS A consolidated plume map is presented in Section 9 of this ASER. The original report, Trichloroethene and Technetium-99 GroutUIwaterContamination in the Regional Gravel Aquifer for Calendar Year 1999 at the Paducah Gaseous Diffusion Plant, Paducah, Kentucky, (BJCIPAD-169), contains many maps utilized to determine the consolidated plume map for the site. DOE 1999a. Remedial Investigation Report for Waste Area Grouping 6 at the Paducah Gaseous Diffusion Plant, Paducah, Kentucky, DOE/ORl07-1727&D2, May. DOE 1999b. Remedial Investigation Report for Waste Area Grouping 27 at the Paducah Gaseous Diffusion Plant, Paducah, Kentucky, DOE/ORl07-1777&D2, June. DOE 2000a. Remedial Investigation Report for Waste Area Grouping 28 at the Paducah Gaseous Diffusion Plant, Paducah, Kentucky, DOE/ORl07-1846&DI, January. DOE 2000b. Data Report for the Sitewide Remedial . E.valuation for Source Areas Contributing to Off-Site Groundwater Contamination at the Paducah Gaseous Diffusion Plant, Paducah, Kentucky, DOE/OR! 07 -1845101, January. DOE 2000c. Site Evaluation Report for Waste Area Grouping 8 at the Paducah Gaseous Diffusion Plant, Paducah,· Kentucky,. DOE/ORI 07-1867&DO; March ... APPENDIX B DATA SET B.1 DEVELOPMENT OF DATA SET B.1.1 DESCRIPTION OF MAPS The maps generated for this report graphically portray TCE and 99Tc concentrations in the RGA. For purposes of this report the RGA is defined as those sediments found between the elevations of 76.2 m (250 ft) and 97.5 m (320 ft) above mean sea level and bounded by the Porters Creek terrace to the south and the Ohio River to the north. The east and west boundaries of the study area are defined by Metropolis Lake Road and Bethel Church Road, respectively. The upper and lower boundaries were selected so that the shallowest and deepest portions of the RGAwould be included. As a result;some of the groundwater samples in the data set may actually be from the upper continental recharge system or from the McNairy Formation. However, it is appropriate to include these samples since they serve as boundaries to the plumes and help define the lateral and vertical extents of. contamination. Appendix D D-9
Paducah Site B.1.2 DESCRiPtiON OF DATA SET The data set used for this plume map revision contains groundwater data from two types of sample locations: monitoring wells whose· screen mid-point is between elevations 76.2 m (250 ft) and 97.5 m (320 ft) above mean sea level, and temporary borings in which a groundwater sample was collected from between the same two elevations. Only those wells and borings for which location coordinates, surface elevations, and screen or sample depths were available were included in the data set. As a result data from the following projects are not included in this interpretation: • monitoring wells belonging to the Tennessee Valley Authority's Shawnee Steam Plant, • residential water wells within the study area, • temporary borings from the WAG 22 RI, • temporary borings from the Northeast Plume Interim Remedial Action, and • temporary borings from the WAG 3 RI. This <strong>information</strong> is currently being gathered and will be included in the next revision as appropriate. B.1.3 SELECTION OF DATA POINTS To identify those wells and borings which fit the depth criteria, the OREIS database was queried for all water samples analyzed for TCE, 99Tc, or beta activity. The sample interval for each collected sample was converted to elevation and filtered to exclude those samples outside the elevations used to define the RGA. For monitoring wells, the elevation of the midpoint of the well screen was used as the sample depth. The samples were then segregated into lower, middle, and upper RGA intervals, defined as elevations 76.2 to 89.9 m (250 to 295 ft), 89.9 to 93.0 m (295 to 305 ft), and 93.0 to 97.5 m (305 to 320 ft) above mean sea level, respectively. The interval for the lower RGA is larger than the upper or middle so that data from "channels" identified in various portions of the plant would be included in the interpretation. Once the sample points were assigned to one of the three intervals, base maps for each interval that showed only those wells and borings that collected a sample from that interval were printed. B.1.4 SELECTION OF GROUNDWATER DATA The groundwater data set consists of TCE concentrations, 99Tc activities, or beta activities for those data points defined as RGA in this report. The data were selected from all groundwater data collected on or before December 31, 1999, and entered in OREIS by March 1, 2000. For monitoring well data, time versus concentration plots were created and trend lines developed. To normalize the data, these trend lines were used to determine the probable concentration of the well as of June 30, 1999. This value was then plotted on the base maps. For temporary borings, the actual analytical value was used. For borings with multiple samples within one interval, the highest concentration within the interval waS selected and plotted on the base maps. Data from CY 1999 were given the highest priority, while data from earlier years were used in trending and identifying approximate boundaries with the oldest data being of least value in the interpretation. B.1.5 MAPPING OF DATA. After all data were plotted on the base maps, the data were hand-contoured. Separate maps were made for both TCE and 99Tc in the upper, middle and lower RGA intervals. The contour intervals for TCE and 99Tc were as follows: 0-10 Appendix 0
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