Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model Rev 00, ICN 00 ANL-NBS-HS-000034 August 2000 1. PURPOSE This Analysis/Model Report (AMR) documents an analysis of water-level data performed to provide the saturated-zone, site-scale flow and transport model (hereafter referred to as the saturated zone (SZ) site-scale model) (CRWMS M&O 2000a) with the configuration of the potentiometric surface and target water-level data for model calibration. This analysis is designed to use existing water-level data and analysis results as the basis for estimating waterlevel altitudes and the potentiometric surface in the SZ site-scale model domain. The objectives of this AMR are to develop computer files containing water-level data and a potentiometricsurface map. These data will be used to represent an approximation of the water table in the SZ site-scale model. In addition to being utilized by the SZ site-scale model, the water-level data and potentiometric-surface map contained within this report will be available to other government agencies and water users for ground-water management purposes. Because the potentiometric surface defines the upper boundary of the site-scale flow model, as well as the magnitude and direction of lateral ground-water flow within the flow system, the analysis documented in this AMR is important to SZ flow and transport calculations to be made in support of total system performance assessment. The source data associated with this analysis and AMR include water-level data from boreholes within, and from one borehole (UE-25 J-11) adjacent to, the SZ site-scale model area. The SZ site-scale model area (Figure 1-1) is between a Universal Transverse Mercator (UTM) Easting of 533,340 meters and 563,340 meters and a UTM Northing of 4,046,782 meters and 4,091,782 meters (Zone 11, North American Datum 1927). The following types of information were gathered: borehole site name/identification (ID), location, land-surface altitude, water-level altitude, data source, reliability of data, minimum and maximum water levels (range), and open interval monitored with the associated water-level altitude and type. Development of this analysis was performed pursuant to AMR Development Plan TDP-NBSHS- 000099 (USGS 2000a). The scope of this AMR includes: • Compilation of available data within the model area • Removal of duplicate measurements and sites • Tabulation of measurement precision • Assessment of the general reliability of the data • Tabulation of the range in water levels for use in uncertainty analyses • Documentation of the applicable use of water levels (potentiometric-surface development or SZ site-scale model calibration) • Generation of the potentiometric-surface map representative of the early 1990s (the steady-state time period of the saturated-zone, regional-scale flow model that is used to provide boundary conditions to the SZ site-scale flow model) Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 7 August 2000 Figure 1-1. Location Map of the Study Area and Associated Geographic Features Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 8 August 2000 Figure 1-2. Borehole Locations, Water-Level Altitudes, Potentiometric Surface Contours, and Location of Tertiary Faults in SZ Site-Scale Model Area (DTN: GS000508312332.001) Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 9 August 2000 In this analysis, the water-level data are used to generate a single representative potentiometric surface (Figure 1-2) for the SZ site-scale model domain. The potentiometric surface presented in this AMR represents an approximation of the water table in the upper saturated zone. Therefore, vertical hydraulic gradients were not considered as part of this analysis even though twelve of the boreholes that provided data for this analysis have multiple piezometers that isolate measurement intervals. Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 10 August 2000 2. QUALITY ASSURANCE The activities documented in this AMR were evaluated in accordance with QAP-2-0, Conduct of Activities, and were determined to be subject to the requirements of the U.S. DOE Office of Civilian Radioactive Waste Management (OCRWM) Quality Assurance Requirements and Description (QARD) (DOE 2000). This evaluation is documented in Wemheuer (1999, activity evaluation for work package WP 8191213SU1). This AMR has been prepared in accordance with procedure AP-3.10Q, Analyses and Models. The work activities documented in this AMR depend on electronic media to store, maintain, retrieve, modify, update, and transmit quality affecting information. As part of the work process, electronic databases, spreadsheets, and sets of files were required to hold information intended for use to support the licensing position. In addition, the work process required the transfer of data and files electronically from one location to another. Consequently, all electronic files consisting of source data, development analysis inputs, analysis outputs, and post-processing results were maintained and processed according to the seven compliance criteria listed in AP-SV.1Q, Control of the Electronic Management of Data pursuant to the Development Plan governing these activities (USGS 2000a). Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 11 August 2000 3. COMPUTER SOFTWARE AND MODEL USE The water-level data were compiled and the potentiometric surface was constructed using geographic information system (GIS), spreadsheet, database, and gridding software. No controlled software codes were used to synthesize the water-level data for the SZ site-scale model. The software identified in Table 3-1 is currently being processed in accordance with Section 5.11 of AP-SI.1Q, Software Management. Table 3-1. Software Used to Support Analysis Activity Item No. Software Name Version Software Tracking Number Computer Platform, Operating System, Compiler Description 1 ARCINFO 7.2.1 STN: 10033-7.2.1-00 Windows NT Workstation ver. 4 CPU ID#: 15409290306 Location: San Diego Projects Office, USGS/WRD, San Diego, CA Plotting, digitizing, coordinate transformation, database, and visualization of analysis results. 2 PETROSYS 7.60d STN: 10168-7.60d-00 Windows NT Workstation ver. 4 CPU ID#: 15409290306 Location: San Diego Projects Office, USGS/WRD, San Diego, CA Gridding, contouring, plotting, and visualization of analysis results. A brief description of how the software was used follows. ARCINFO Version 7.2.1, published by Environmental Systems Research Institute, Inc., was used for plotting, digitizing, coordinate transformation, and visualization of analysis results. PETROSYS Version 7.60d, published by Petrosys Pty, Ltd., was used for gridding, contouring, plotting, and visualization of analysis results. The use of software and data inputs for developing the potentiometric surface is summarized in Section 6.2. Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 12 August 2000 4. INPUTS 4.1 DATA AND PARAMETERS The data used to construct the potentiometric surface and to define target water-levels in selected boreholes for flow-model calibration were developed from available measurements of water levels in boreholes throughout and adjacent to the SZ site-scale flow model domain. Because, in general, these water-level measurements represent the configuration of the potentiometric surface in the upper part of the saturated zone and no additional control is available from springs and other surface-water occurrences, these data were considered to be appropriate for their intended use in defining the upper boundary and determining lateral hydraulic gradients for the SZ sitescale flow model. Additional support for the appropriateness of the data is covered in Section 1 (Purpose), which describes the scope of the data used; in Section 5.1 (Assumptions – Water- Level Data), which addresses the assumptions about the use of the data; in Section 6.1 (Analysis – Water-Level Data), which presents the analysis of the data used; and in Section 7.1 (Conclusion – Water-Level Data), which discusses potential errors and uncertainty. Specific input data sets, and associated Data Tracking Numbers (DTNs), are listed in Table 4-1. The Quality Assurance status of these input sources can be found in the Document Input Reference System (DIRS). Table 4-1. Input Data Sources Data Description Data Tracking Number Digital Elevation Models Death Valley East Scale 1:250,000. GS000400002332.001 Water-Level Measurements at UE-25 C #2 and C #3, 1989. GS000408312312.001 Revised Water-Level Altitude Data from the Periodic Network, First Quarter 1995. GS000608312312.004 Water-Level Altitude Data, 1993. GS000708312312.005 Revised Potentiometric Surface Map of Yucca Mountain and Vicinity, Nevada GS921108312331.001 Water Levels in the Yucca Mountain Area, Nevada, 1990-91. GS930408312312.015 Water Levels in Periodically Measured Wells in the Yucca Mountain Area, Nevada, 1981-87. GS931008312312.025 Water-Level Altitude Data from the Periodic Network, Fourth Quarter, 1994. GS950108312312.001 Potentiometric-Surface Map, 1993, Yucca Mountain and Vicinity, Nevada. GS950508312312.005 28 Water-Level Measurements from the Periodic Network, Third Quarter, 1995 (7/1/95 - 9/30/95). GS960208312312.003 Analysis of Water-Level Data in the Yucca Mountain Area, Nevada, 1985- 1995. GS960908312312.010 Water Level Altitude Data Collected at GEXA Well 4 and USW G-4. GS970600012847.001 Water Level Data for Yucca Mountain Region and Amargosa Desert. GS991100002330.001 Geologic Map of the Yucca Mountain Region. GS991208314221.001 Water Level Measurements in Boreholes, NC-EWDP-1D, NC-EWDP-1D Shallow, & NC-EWDP-1D Deep, Nye County Early Warning Drilling Program. MO0004NC99WL1D.000 Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 13 August 2000 Data Description Data Tracking Number Water Level Measurements in Borehole, NC-EWDP-1S, Nye County Early Warning Drilling Program. MO0004NC99WL1S.000 Water Level Measurements in Borehole, NC-EWDP-Washburn-1X, Nye County Early Warning Drilling Program. MO0004NC99WL1X.000 Water Level Measurements in Borehole, NC-EWDP-2D, Nye County Early Warning Drilling Program. MO0004NC99WL2D.000 Water Level Measurements in Borehole, NC-EWDP-3D, Nye County Early Warning Drilling Program. MO0004NC99WL3D.000 Water Level Measurements in Borehole, NC-EWDP-3S, Nye County Early Warning Drilling Program. MO0004NC99WL3S.000 Water Level Measurements in Borehole, NC-EWDP-5S, Nye County Early Warning Drilling Program. MO0004NC99WL5S.000 Water Level Measurements in Borehole, NC-EWDP-9S, Nye County Early Warning Drilling Program. MO0004NC99WL9S.000 USW SD-7 Shift Drilling Summaries (1602.0'-2020.3'), Lithologic Logs (1600.0'-1925.0'), and Structure Logs (1632.0'-2020.3'). TM0000000SD7RS.003 USW SD-9 Shift Drilling Summaries, Structural Logs, and Lithological Logs. TM0000000SD9RS.001 USW SD-12 Shift Drilling Summaries, Lithologic Logs, and Structure Logs from 1825.0'-2166.3'. TM000000SD12RS.011 The locations of the boreholes and the water-level altitudes in these boreholes that were used to construct the potentiometric surface are shown in Figure 1-2 together with the inferred contoured configuration of the potentiometric surface. The borehole data are provided in Attachment I. Data qualification efforts as needed will be conducted in accordance with AP-SIII.2Q, Qualification of Unqualified Data and the Documentation of Rationale for Accepted Data, and documented separately from this AMR. 4.2 CRITERIA This AMR complies with the DOE interim guidance (Dyer 1999). Subparts of the interim guidance that apply to this analysis activity are those pertaining to the characterization of the Yucca Mountain site (Subpart B, Section 15), the compilation of information regarding hydrology of the site in support of the License Application (Subpart B, Section 21(c)(1)(ii)), and the definition of hydrologic parameters and conceptual models used in performance assessment (Subpart E, Section 114(a)). 4.3 CODES AND STANDARDS No codes or standards have been identified as applying to this analysis. Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 14 August 2000 5. ASSUMPTIONS 5.1 WATER-LEVEL DATA In the analysis presented in this report, several assumptions are made as described in the following subsections. The nature of these assumptions entails established hydrologic practices for the determination of water-level altitudes to be used in the construction of a potentiometricsurface map and require no further confirmation. 1. Assumption: Averaging water levels from the 1980s to 1990s provide water-level altitudes representative of conditions that existed in early 1990s. The SZ site-scale model (CRWMS M&O 2000a) uses ground-water fluxes from the Death Valley regional ground-water flow model (hereafter referred to as the regional model) (D’Agnese et al. 1997) as calibration targets. The simulated fluxes in the regional model represent average, steady-state conditions from the early 1990’s, not conditions for a specific year. Therefore, the water levels used to construct the potentiometric surface for the site-scale model must, to the extent allowed by data availability, represent conditions consistent with the regional model that used waterlevel data (altitudes) representing the early 1990s. Water levels in boreholes located at Yucca Mountain generally have not fluctuated by more than one meter during the time period from 1985 until 1995 (Graves et al. 1997). Some of the boreholes used in this analysis had no or very few water-level measurements taken during the 1980s and 1990s (Tables I-2 and I-4). For boreholes in this category, all available water-level altitudes, with the exception of anomalous ones noted in Attachment I, were used to calculate the mean water-level altitude (Table I-1). This is particularly true for boreholes located in the Amargosa Valley and Amargosa Desert (Figure 1-2). This assumption is used in Section 6.1 and Table I-1. 2. Assumption: Mean water-level altitudes, even when influenced by ground-water withdrawal, represent water-level altitudes consistent with ground-water fluxes used in the SZ site-scale model. Some boreholes in the model area are being actively pumped for commercial and domestic water supplies. Water-level altitudes in these and adjacent boreholes could be influenced by the effects of pumping. This is especially true in the southern part of the SZ site-scale model area. The mean water-level altitude, calculated by averaging available data, provides a datum point that is representative of the potentiometric surface for the time period being simulated. The rationale is that average-annual pumping values were used in the regional model (D’Agnese et al. 1997) and average water levels will, therefore, be consistent with the simulated conditions in the regional model. This assumption is used in Section 6.1 of this AMR. 3. Assumption: Where measurement location is unknown, the midpoint of the open interval or applicable packed-off interval is representative of the measurement location for SZ site-scale modeling purposes. Most of the water levels used in this analysis are composite data, for a long open or screened interval. In open boreholes, the midpoint can be calculated as the mean of the altitude of the bottom of the borehole and the altitude of the maximum waterlevel altitude. In packed-off intervals (screened intervals), the midpoint is calculated as the mean of the altitude of the bottom of the packed-off interval and the altitude of the top of the Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 15 August 2000 packed-off interval. Because this method is used for all boreholes that contributed waterlevel altitude data for this analysis, it provides a means for standardizing SZ measurements locations (Table I-5). This assumption is used throughout the AMR. 5.2 POTENTIOMETRIC-SURFACE MAP In the analysis presented in this report, it is assumed that the water level from the uppermost open interval from each borehole at each site, by definition, represents the potentiometric surface of the uppermost part of the saturated zone (i.e., the water table) and that vertical gradients of head are small. Most boreholes have only one water-level measurement interval, however, several boreholes have two or more packed off measurement intervals (Attachment I). In most boreholes, the uppermost interval is where the water was first encountered in the borehole (excluding perched-water zones where identified). The significance of this assumption is that the resulting configuration of the potentiometric surface that is incorporated into the SZ site-scale model helps determine the magnitude and direction of lateral ground-water flow in the upper SZ. This is of concern to the evaluation of potential radionuclide transport down gradient from the potential repository. This assumption is used in Section 6.2. 5.3 BOREHOLE LOCATIONS Borehole locations used in this analysis, and compiled in USGS 2000b, are sufficiently accurate for the intended purpose. Borehole coordinates and altitudes from USGS 2000b and DTN: MO0002COV00088.001, which only contains YMP boreholes, were compared. Differences in the northing and easting coordinates contained in the two records exist in most borehole locations. The altitudes of the boreholes in the two data sets were identical. Borehole altitude is the most critical component of the borehole location used for calculating the water-level altitude. Where there are differences in northing and easting coordinates, the differences are not large enough to adversely effect the location of the potentiometric-contour lines, which have 25-meter spacing. This assumption is used throughout this AMR. Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 16 August 2000 6. ANALYSIS/MODEL Although the water-level data and resulting potentiometric-surface map provide technical input for the development of the site-scale, saturated-zone flow and transport model that addresses the retardation of radionuclide migration in the saturated zone, the analysis documented in this AMR does not estimate or otherwise directly address any of the principal factors, other factors, or potentially disruptive processes and events included within the Repository Safety Strategy (CRWMS M&O 2000b). Consequently, this AMR is considered to be of Level 3 importance pursuant to Attachment I of AP-3.10Q. 6.1 WATER-LEVEL DATA The water-level data for the SZ site-scale model were compiled from project data sources and U.S. Geological Survey (USGS) National Water Information System (NWIS) water-level data. This data set was updated using new (collected between January and March, 1999) information from the Nye County Early Warning Drilling Program (EWDP) boreholes and from geologic mapping within the model area (DTN: GS991208314221.001). Water-level information and analyses were compiled from the data sources listed in Table 4-1 of this AMR. The results were assembled in tabular format for use as input to the SZ site-scale model (see Attachment I). Water-level information used in this analysis was derived from a variety of sources. The large areal extent of the SZ site-scale model and the long history of water-level data collection in this area has resulted in similar (or in some cases duplicate) water-level information being contained in multiple data sources. Water-level data used in this AMR were based on the following prioritization: 1) qualified data from project databases; 2) data from accepted data sources; and, 3) corroborative data from other sources. This prioritization resulted in the following data sources being used in the order listed, with duplicate sites being removed: 1. DTN: GS960908312312.010 2. DTNs: GS991100002330.001, GS970600012847.001, GS930408312312.015, GS931008312312.025, GS960208312312.003, GS000408312312.001, GS950508312312.005, GS000608312312.004, GS000708312312.005, GS950108312312.001 3. DTNs: MO0004NC99WL1D.000, MO0004NC99WL1S.000, MO0004NC99WL2D.000, MO0004NC99WL3D.000, MO0004NC99WL3S.000, MO0004NC99WL5S.000, MO0004NC99WL9S.000, MO0004NC99WL1X.000 4. DTNs: TM0000000SD9RS.001, TM000000SD12RS.011, TM0000000SD7RS.003 If more than one site ID was found in NWIS for the same borehole, the site ID with the most measurements was used for calculating the average water-level altitude for the time period of interest. If location, land-surface altitude, or depth-to-water for a borehole was not available, the site was deleted. NWIS data is stored as depth-to-water measurements, not as water-level altitude, and in English units as opposed to metric units. Conversion from depth-to-water to water-level altitude was accomplished by subtracting the depth-to-water measurement from the Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 17 August 2000 land-surface altitude of the measurement location (the borehole and surface altitude). The resulting water-level altitude was converted from feet to meters by multiplying by 0.3048. Borehole UE-25 p#1 is the only borehole that penetrates the deep lying Paleozoic carbonate rocks in, and adjacent to, the SZ site-scale model area. The water level measured in UE-25 p#1 is about 20 m higher than water levels measured in nearby boreholes that penetrate Tertiary volcanic rocks within the upper saturated zone at Yucca Mountain. Because the water level in UE-25 p#1 is measured in an interval open to Paleozoic carbonate rocks that are separated from overlying volcanic rocks by low-permeability volcanic and clastic rocks, it is concluded by Tucci and Burkhardt (1995) that the water level measured in UE-25 p#1 is representative of the Paleozoic carbonate aquifer and not the potentiometric head of the uppermost saturated zone. The water level from UE-25 p#1 has not been used in the construction of the potentiometricsurface map that was developed for input to the site-scale SZ model documented in this AMR. There are two substantially different water-level gradients in the model area (Figure 1-2). Near the potential repository, the hydraulic gradient is small and water levels are known typically within 1 meter and do not vary a great deal over this area. Conversely, at the north end of the SZ site-scale model area and just north of the potential repository, the hydraulic gradient is large and water-level altitudes are hundreds of meters higher and vary greatly. These elevated water levels may or may not represent the uppermost part of the saturated zone (i.e., the water table), but may actually represent a zone of perched water. Borehole information was examined to see if water levels potentially represented perched-water conditions. Professional judgment was used to determine whether water-level altitudes represented perched-water conditions, based on the following criteria: proximity to cold-water springs, proximity to recharge areas, steep or anomalous potentiometric surface slope, anomalous water-level altitudes, statistical water-level variability, water chemistry, pumping history, and hydrographs (O’Brien 1998). Potential perched-water levels identified during this analysis were flagged and identified as “suspected perched” (Table I-8). To prove perched-water occurrence unequivocally requires demonstrating partial saturation beneath a suspected perched-water body. The boreholes in question were either drilled using a water-based circulating fluid or were only completed a few tens of meters into the first zone of saturation. Unfortunately, partial saturation could not be proved or disproved unequivocally with the available data for the boreholes in question, USW G-2, USW G-1, UE-29 a#2, UE-25 a#3, USW UZ-N91, UE-25 WT #18, and UE-25 WT#6, (Table I-8, O’Brien 1998). 6.2 POTENTIOMETRIC-SURFACE MAP The distribution of water-level data and the complex geology in the SZ site-scale model area allow for various interpretations of the configuration of the potentiometric surface (Luckey et al. 1996, pages 21-26). Several potentiometric-surface maps have been developed that encompass Yucca Mountain and vicinity, including the site-scale model area and the regional model area. Examination of other potentiometric-surface maps, that fully or partially cover the SZ site-scale model area, reveal no major differences in the shape of potentiometric-contour lines. This is not unexpected because similar, and in some cases the same, water-level data was used to create the Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 18 August 2000 potentiometric-contour lines; and, adhering to the rules that govern the construction of potentiometric contours, a limited number of configurations of the water-level data are possible. The differences observed between existing potentiometric-surface maps and the one presented in this AMR can be attributed to map scale, potentiometric-contour intervals, and more and newer water-level data. The potentiometric-surface map created for this AMR is an accurate interpretation based on the available water-level data, the geologic map of the Yucca Mountain region, and the regional potentiometric surface. The potentiometric-surface map presented in Czarnecki et al. (1997, figure 5) is identical in areal extent and has the same contour interval as the potentiometric-surface map developed for this AMR. Examination of that potentiometric-surface map illustrates an alternative interpretation constructed from similar water-level data. Differences in the two maps occur at the boundaries of the maps, where there is little or no data, and where the potentiometric surface is influenced by major faults. The major difference in the shape of the potentiometric contours occurs in the northern and northwestern area of the maps. Czarnecki et al. (1997) suggest a closing of the contour lines to the north of the large hydraulic gradient (LHG), water-level altitudes as much as 150 meters shallower, and an east-west trend of the contours in southern Crater Flat. Largerscale potentiometric-surface maps (Ervin et al. 1994, plate 1; Tucci and Burkhardt 1995, page 8) cover only a small portion of the site-scale model area in the vicinity of Yucca Mountain. The potentiometric-surface map by Ervin et al (1994) has water-level contour intervals of 0.25 meters. This map does not attempt to contour the areas of the LHG or the moderate hydraulic gradient to the west of the Solitario Canyon fault, but the general shape of the potentiometric contours are similar to the map constructed for this AMR. The potentiometric-surface map in Tucci and Burkhardt (1995) has contour intervals that are variable, from 0.50 meters to 20.00 meters. Comparing the same potentiometric contour (800-meter contour) on this map and the map constructed for this AMR reveals a similarity in shape. The shape of the water-level contours on these larger-scale potentiometric-surface provides an alternative interpretation based on similar water-level data. The regional potentiometric surface of the Death Valley region (D'Agnese et al. 1997, plate 1) is at a much smaller scale than the potentiometric-surface map in this AMR. The contour intervals on D'Agnese et al. (1997) are 100 meters, resulting in only a few contour lines intersecting the site-scale model area. As with the larger-scale potentiometricsurface maps, the same water-level contours that occur on D'Agnese et al. (1997, plate 1) and the potentiometric-surface map in this AMR can be compared. This comparison reveals that the potentiometric contours on both maps are similar. An alternative conceptual interpretation of the potentiometric surface in the northern part of Figure 1-2 could be considered if the water-level data defining the LHG were treated as representing a perched-water body. Boreholes where perched water is suspected to occur are listed in Table I-8. The exclusion of these data points would result in modifications to the potentiometric-surface map. Lower water-table altitudes would be depicted in the northern portion of the SZ site-scale model area, thereby reducing the LHG. However, limited hydraulic data preclude the determination that the water levels in these boreholes represent perched conditions. Therefore, this conceptual approach was not selected in the construction of the potentiometric-surface map for this AMR. Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 19 August 2000 For SZ site-scale model construction purposes, the potentiometric-surface map was created (Figure 1-2). The water-level altitude from the upper interval of each borehole from a site was selected to represent the potentiometric surface (see Attachment I, Table I-1). Only water-level altitudes representing the uppermost aquifer system, typically the volcanic or alluvial system, were used. Potentiometric data indicate a complex three-dimensional flow system. Luckey et al. (1996) discuss different gradients and interpretations of the SZ site-scale model. Ground-water flow in the welded volcanic rocks occurs primarily in fractures and secondarily in the matrix of the rock (Luckey et al. 1996). Therefore, this flow system may result from the presence of faults and associated fracture zones occurring in the welded volcanic hydrogeologic units. Depending upon where the potentiometric surface is located within the hydrostratigraphic sequence, it may be either confined or unconfined. Confined aquifers exist where a relatively impermeable hydrogeologic unit, such as a clay bed or argillic volcanic unit, overlies a permeable hydrogeologic unit. An unconfined aquifer has no overlying, relatively impermeable, hydrogeologic unit. Many of the boreholes used in this analysis only partially penetrate a single hydrogeologic unit. In boreholes that do penetrate more than one hydrogeologic unit, no attempt was made to distinguish water-level measurements associated with specific hydrogeologic units or fracture zones. The water-level altitudes in some boreholes represent composite heads from multiple hydrogeologic units and fractures zones. Generally, water levels in the upper most saturated zone appear to represent a laterally continuous, well-connected aquifer system (Tucci and Burkhardt 1995, p.7). Little impact on the potentiometric surface is expected from boreholes that are open at different depth intervals and to different hydrogeologic units. Water-level and fault data were used to grid and contour a potentiometric-surface map (Figure 1-2). Gridding is the process of creating a grid of values at regular intervals based on scattered input data. The PETROSYS gridding system and fault handling package was used to interpolate the potentiometric surface between existing water-level altitude points. A grid position coincident with the regional ground-water flow model of D’Agnese et al. (1997) was used. A grid increment of 500 m was chosen based on flow modeling requirements, rather than locally adjusting the grid for data density. This grid increment simplifies the available data near the repository and extrapolates from very widely spaced data in other areas of the model. Many methods (both mathematical and interpretive) are available for use in creating grids. Most methods (except distance weighted average and the trend surface analysis) use a projected distance weighted average to obtain initial grid estimates from the input data. Once the initial estimation has been performed, the grid is allowed to converge to an optimum solution by using forced filtering. This filtering pass fills in the missing values in the grid. The water-level data were loaded into the PETROSYS gridding software. The potentiometric contours previously developed by Ervin et al. (1994, DTN: GS921108312331.001) and by Tucci and Burkhardt (1995, DTN: GS950508312312.005) for Yucca Mountain and vicinity were digitized into ARCINFO to ensure conformity with these data sets. The contours were then Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 20 August 2000 exported as ASCII point files and loaded into PETROSYS. These larger-scale, more closely spaced digitized contour lines were used to help supplement the water-level data and guide the contouring of the potentiometric surface produced from this analysis. Water levels from Ciesnik (1995) were used outside the SZ site-scale model domain to help constrain the potentiometric surface in the southern portion of the SZ site-scale model area. Because it was necessary to construct an estimated potentiometric surface for the entire model area, gridding algorithms were allowed to use the available data to extrapolate the potentiometric surface beyond the data points on all boundaries. The extrapolation is based solely on trends in the data. Scientific Notebook SN-USGS-SCI-072-V2 (Faunt 2000) provides more information on the steps used to create this potentiometric surface map. A hybrid gridding technique in PETROSYS was used to construct a continuous grid or surface utilizing a set of points in x,y,z space. The hybrid method is a combination of the minimum curvature and a first order least squares. It uses first order least squares within one grid cell of a fault and minimum curvature to calculate all other nodes. In heavily faulted datasets, such as Yucca Mountain, the results may be better than those obtained using the minimum-curvature method (widely used in geologic modeling). Some of the major faults in the region are thought to affect water levels (Ervin et al. 1994; Tucci and Burkhardt 1995; Luckey et al. 1996; D’Agnese et al. 1997). As a result, several of these faults were selected to help interpret the water-level data used in the analysis (Figure 1-2). The selection was based on fault displacement of geologic units and persistence of the fault, both laterally and vertically. These fault traces were exported as ARC ungenerate files and loaded into the PETROSYS gridding software. These fault lines were used to help control assumed offsets in the potentiometric surface. Using a fault-handling package built into the gridding software, the fault traces were used during the final stage of the potentiometric-surface map construction. Where the grid crosses a fault, the grid is offset by the appropriate amount. Inherent in using fault traces is the simplification of these faults being traces of a vertical fault plane. The location of some of the major faults helped to explain the water-level altitudes in some of the boreholes and the resulting potentiometric-surface map. For example, a moderate hydraulic gradient is associated with the area adjacent to the Solitario Canyon fault. Water-level altitudes to the west of the Solitario Canyon fault are more than 40 meters higher than those to the east (Ervin et al. 1994; Tucci and Burkhardt 1995). The potentiometric surface is characterized by three major regions: (1) a small-gradient area to the east and southeast of Yucca Mountain where water levels range from about 728 to 732 m; (2) a moderate-gradient area to the west of Yucca Mountain (spatially associated with Solitario Canyon fault) where water levels range from about 740 to 800 m and (3) a large-gradient area to the north of the mapped area where water levels range from about 738 to 1188 m (Tucci and Burkhardt 1995). The potentiometric surface presented in this analysis and in previously published reports generally implies a hydraulically, well-connected flow system within the uppermost saturated zone (Tucci and Burkhardt 1995) as discussed above. Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 21 August 2000 A number of explanations have been proposed to explain the presence of the apparent LHG at the north end of Yucca Mountain, an area where the altitude of the potentiometric surface appears to change by about 300 meters over a lateral distance of 2 kilometers (Czarnecki et al. 1994; Czarnecki et al. 1995). Prior to the construction of borehole USW G-2 in 1981, no water-level data existed at Yucca Mountain to indicate the presence of the LHG. As more boreholes were constructed in the northern part of Yucca Mountain, particularly boreholes UE-25 WT#6 and UE-25 WT#16, a somewhat better definition of the LHG developed. On a regional basis, other LHGs are associated with a contact in the Paleozoic rocks between clastic, confining unit rocks and the regional carbonate aquifer; however, the cause and nature of the LHG near Yucca Mountain is not evident. Explanations proposed for the LHG include: 1) faults that contain nontransmissive fault gouge (Czarnecki and Waddell 1984); 2) faults that juxtapose transmissive tuff against nontransmissive tuff (Czarnecki and Waddell 1984); 3) the presence of a less fractured lithologic unit (Czarnecki and Waddell 1984); 4) a change in the direction of the regional stress field and a resultant change in the intensity, interconnectedness, and orientation of open fractures on either side of the area with the LHG (Czarnecki and Waddell 1984); or 5) the apparent large gradient actually represents a disconnected, perched- or semi-perched- water body, so that the high water-level altitudes are caused by local hydraulic conditions and are not part of the regional saturated-zone flow system (Czarnecki et al. 1994; Ervin et al. 1994). Fridrich et al. (1994) suggest two hydrogeologic explanations for the LHG: 1) a highly permeable buried fault that drains water from the volcanic rock units into a deeper regional carbonate aquifer or 2) a buried fault that forms a 'spill-way' in the volcanic rocks. Their second explanation, in effect, juxtaposes transmissive tuff against non-transmissive tuff, and is therefore the same as 2) above. Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 22 August 2000 7. CONCLUSIONS This document may be affected by technical product input information that requires confirmation. Any changes to the document that may occur as a result of completing the confirmation activities will be reflected in subsequent revisions. The status of the input information quality may be confirmed by review of the DIRS database. Some water-level measurements at UE-25 C #2 and C #3, and at USW G-4, which are used in this analysis, are To Be Verified. These data have minimal control on the shape of the potentiometric contours at Yucca Mountain. Qualified and accepted data from these same boreholes and nearby boreholes are sufficient to determine the shape of the potentiometric surface in this area. ARCINFO V7.2.1 and PETROSYS V7.60d, used as explained in Section 3 of this AMR, are also To Be Verified. Consequently, the output data (DTN: GS000508312332.001) would also currently be statused To Be Verified by a user. 7.1 WATER-LEVEL DATA Actual water-level altitudes (DTN: GS000508312332.001) in the SZ site-scale model area range over 400 meters. The data distribution generally is very uneven and the hydraulic character of the formations from which the water level is derived is variable. As a result, the range in water levels varies significantly over the SZ site-scale model area. Most of the water levels used in this analysis were composite levels with water being produced from one or more hydrogeologic units or fracture zones as indicated in Attachment I of this AMR. Because of long open (uncased) or perforated/screened intervals, many boreholes intercept multiple permeable zones resulting in a composite water-level altitude. Potential errors in the potentiometric surface, such as those resulting from perched-water bodies, and the general ranges in water levels could be evaluated using the borehole site-location accuracy, land-surface altitude accuracy, water-level altitude precision, and water-level measurements and methodology accuracy documented in Attachment I. This information could be used to evaluate the representativeness of the water-level altitudes used in this analysis and to determine whether or not they represent the potentiometric surface of the upper saturated zone. In addition to measurement uncertainties, the range in water levels for a borehole can be used in the determination of an uncertainty of a mean water level at that site. Pumping is included in the flux rates used in the regional model; therefore water levels that may be influenced by pumping are included in the SZ site-scale model. Because of the uncertainties for water levels discussed in the previous paragraphs, the range in water-level altitudes and possible causes should be taken into account during SZ site-scale model calibration. Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 23 August 2000 7.2 POTENTIOMETRIC-SURFACE MAP The potentiometric surface shown in Figure 1-2 provides a contour-map representation of the potentiometric surface from water-level data that were developed as part of this analysis and that are available from the Technical Data Management System under DTN: GS000508312332.001. The potentiometric surface developed from the data listed in Table 4-1 incorporates the potential errors and uncertainties identified in this AMR. Hence, the accuracy of the potentiometric surface will vary spatially. In the potential repository area, the potentiometric surface may be characterized within one meter; however, in other areas within the SZ site-scale model area the uncertainty in water levels is much greater. Areas where perched-water zones may exist, waterlevel drawdown associated with pumping in the Amargosa Valley, and the unknown effect of faults on water-level altitudes all add to the uncertainty of the accuracy of the potentiometric surface constructed using this data. If some of the water levels measured in the vicinity of Yucca Mountain represent perched-water conditions, the saturated-zone potentiometric surface could be substantially different. Therefore, the potentiometric-surface map associated with the AMR (Figure 1-2) is intended for SZ site-scale modeling purposes only. The potentiometric surface presented herein does not strictly represent the water table, a concept reserved for the actual interface between the saturated and unsaturated zones. However, the potentiometric surface presented is probably a close and reasonable representation of the water table for the early 1990’s. Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 24 August 2000 8. INPUTS AND REFERENCES 8.1 DOCUMENTS CITED Ciesnik, M.S. 1995. Ground-Water Altitudes and Well Data, Nye County, Nevada, and Inyo County, California. Open-File Report 93-89. Denver, Colorado: U.S. Geological Survey. ACC: MOL.19940908.0078. CRWMS M&O 2000a. Calibration of the Site-Scale Saturated Zone Flow Model. MDL-NBSHS- 000011 REV 00. Las Vegas, Nevada: CRWMS M&O. Submit to RPC URN-0191 CRWMS M&O 2000b. Repository Safety Strategy: Plan to Prepare the Postclosure Safety Case to Support Yucca Mountain Site Recommendation and Licensing Considerations. TDR-WIS-RL- 000001 REV 03. Las Vegas, Nevada: CRWMS M&O. ACC: MOL.20000119.0189. Czarnecki, J.B. and Waddell, R.K. 1984. Finite-Element Simulation of Ground-Water Flow in the Vicinity of Yucca Mountain, Nevada-California. Water-Resources Investigations Report 84- 4349. Denver, Colorado: U.S. Geological Survey. ACC: NNA.19870407.0173. Czarnecki, J.B.; Faunt, C.C.; Gable, C.W.; and Zyvoloski, G.A. 1997. Hydrogeology and Preliminary Three-Dimensional Finite-Element Ground-Water Flow Model of the Site Saturated Zone, Yucca Mountain, Nevada. Milestone SP23NM3. Denver, Colorado: U.S. Geological Survey. ACC: MOL.19990812.0180. Czarnecki, J.B.; Nelson, P.H.; O'Brien, G.M.; Sass, J.H.; Thapa, B.; Matsumoto, Y.; and Murakami, O. 1995. "Testing in Borehole USW G-2 at Yucca Mountain: The Saga Continues." Eos, 76, (46), 191-192. Washington, D.C.: American Geophysical Union. TIC: 240933. Czarnecki, J.B.; O'Brien, G.M.; Nelson, P.H.; Sass, J.H.; Bullard, J.W.; and Flint, A.L. 1994. "Is There Perched Water Under Yucca Mountain in Borehole USW G-2?." 1994 Fall Meeting, Supplement to Eos, November 1, 1994, 75, (44), 249-250. Washington, D.C.: American Geophysical Union. TIC: 226992. D'Agnese, F.A.; Faunt, C.C.; Turner, A.K.; and Hill, M.C. 1997. Hydrogeologic Evaluation and Numerical Simulation of the Death Valley Regional Ground-Water Flow System, Nevada and California. Water-Resources Investigations Report 96-4300. Denver, Colorado: U.S. Geological Survey. ACC: MOL.19980306.0253. DOE (U.S. Department of Energy) 2000. Quality Assurance Requirements and Description. DOE/RW-0333P, Rev. 10. Washington, D.C.: U.S. Department of Energy, Office of Civilian Radioactive Waste Management. ACC: MOL.20000427.0422. Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 25 August 2000 Dyer, J.R. 1999. "Revised Interim Guidance Pending Issuance of New U.S. Nuclear Regulatory Commission (NRC) Regulations (Revision 01, July 22, 1999), for Yucca Mountain, Nevada." Letter from J.R. Dyer (DOE/YMSCO) to D.R. Wilkins (CRWMS M&O), September 3, 1999, OL&RC:SB-1714, with enclosure, "Interim Guidance Pending Issuance of New NRC Regulations for Yucca Mountain (Revision 01)." ACC: MOL.19990910.0079. Ervin, E.M.; Luckey, R.R.; and Burkhardt, D.J. 1994. Revised Potentiometric-Surface Map, Yucca Mountain and Vicinity, Nevada. Water-Resources Investigations Report 93-4000. Denver, Colorado: U.S. Geological Survey. ACC: NNA.19930212.0018. Faunt, C.C. 2000. Interim Submittal with June, 2000 Technical and Compliance Reviews, for Scientific Notebook SN-USGS-SCI-072-V2 Hydrogeologic Framework for the Site Saturated Zone Model. SN-USGS-SCI-072-V2. ACC: MOL.20000608.0164. Fridrich, C.J.; Dudley, W.W., Jr.; and Stuckless, J.S. 1994. "Hydrogeologic Analysis of the Saturated-Zone Ground-Water System, Under Yucca Mountain, Nevada." Journal of Hydrology, 154, 133-168. Amsterdam, The Netherlands: Elsevier Science B.V. TIC: 224606. Graves, R.P.; Tucci, P.; and O’Brien, G.M. 1997. Analysis of Water-Level Data in the Yucca Mountain Area, Nevada, 1985-95. Water-Resources Investigations 96-4256. Denver, Colorado: U.S. Geological Survey. ACC: MOL.19980219.0851. Luckey, R.R.; Tucci, P.; Faunt, C.C.; Ervin, E.M.; Steinkampf, W.C.; D'Agnese, F.A.; and Patterson, G.L. 1996. Status of Understanding of the Saturated-Zone Ground-Water Flow System at Yucca Mountain, Nevada, as of 1995. Water-Resources Investigations Report 96-4077. Denver, Colorado: U.S. Geological Survey. ACC: MOL.19970513.0209. O'Brien, G. 1998. "Milestone SPH40NM4 (Level 4) — Memo to TPO: Possible Perched-Water Occurrences North of Yucca Mountain." Memorandum from G. O'Brien (USGS) to R. Craig (USGS), September 28, 1998, with attachment, "Perched-Water Analysis Death Valley Region." ACC: MOL.19981130.0221; MOL.19990113.0213. Tucci, P. and Burkhardt, D.J. 1995. Potentiometric-Surface Map, 1993, Yucca Mountain and Vicinity, Nevada. Water-Resources Investigations Report 95-4149. Denver, Colorado: U.S. Geological Survey. ACC: MOL.19960924.0517. USGS (U.S. Geological Survey) 2000a. Water-Level Data Analysis for the Saturated Zone Site- Scale Flow and Transport Model. TDP-NBS-HS-000099 REV 00. Denver, Colorado: U.S. Geological Survey. ACC: MOL.20000630.0045. USGS (U.S. Geological Survey) 2000b. Locations and Elevations for Selected Wells in the Yucca Mountain Region and Amargosa Desert. Denver, Colorado: U.S. Geological Survey. ACC: MOL.20000609.0111. Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 26 August 2000 Wemheuer, R.F. 1999. "First Issue of FY00 NEPO QAP-2-0 Activity Evaluations." Interoffice correspondence from R.F. Wemheuer (CRWMS M&O) to R.A. Morgan, October 1, 1999, LV.NEPO.RTPS.TAG.10/99-155, with enclosures. ACC: MOL.19991028.0162. 8.2 STANDARDS, REGULATIONS, PLANS, AND PROCEDURES CITED AP-3.10Q, Rev.2, ICN 2. Analysis and Models. Washington, D. C.: U.S. Department of Energy, Office of Civilian Radioactive Waste Management. ACC: MOL.20000619.0576 AP-SI.1Q, Rev. 2, ICN 4. Software Management. Washington, D.C.: U.S. Department of Energy, Office of Civilian Radioactive Waste Management. ACC: MOL.20000223.0508 AP-SIII.2Q, Rev. 0, ICN 2. Qualification of Unqualified Data and the Documentation of Rationale for Accepted Data. Washington, D.C.: U.S. Department of Energy, Office of Civilian Radioactive Waste management. ACC: MOL.19991214.0625 AP-SV.1Q, Rev. 0, ICN 1. Control of Electronic Management of Data. Washington, D.C.: U.S. Department of Energy, Office of Civilian Radioactive Waste Management. ACC: MOL.20000512.0068 QAP-2-0, Rev. 5, ICN 1 Conduct of Activities. Las Vegas, Nevada: CRWMS M&O. ACC: MOL.19991109.0221. 8.3 SOFTWARE PROGRAMS U.S. Geological Survey 2000. Software Code: ARCINFO V7.2.1. V7.2.1. 10033-7.2.1-00. URN-0342 U.S. Geological Survey 2000. Software Code: Petrosys V7.60d. V7.60d. 10168-7.60d-00. URN-0359 8.4 SOURCE DATA, LISTED BY DATA TRACKING NUMBER GS000400002332.001. Digital Elevation Models Death Valley East Scale 1:250,000. Submittal date: 04/12/2000. GS000408312312.001. Water-Level Measurements at UE-25 C #2 and C #3, 1989. Submittal date: 04/10/2000. GS000608312312.004. Revised Water-Level Altitude Data from the Periodic Network, First Quarter 1995. Submittal date: 06/27/2000. Submit to RPC URN-0488 GS000708312312.005. Water-Level Altitude Data, 1993. Submittal date: 07/10/2000. GS921108312331.001. Revised Potentiometric Surface Map of Yucca Mountain and Vicinity, Nevada. Submittal date: 10/07/1992. Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 27 August 2000 GS930408312312.015. Water Levels in the Yucca Mountain Area, Nevada, 1990-91. Submittal date: 04/28/1993. GS931008312312.025. Water Levels in Periodically Measured Wells in the Yucca Mountain Area, Nevada, 1981-87. Submittal date: 04/23/1993. GS950108312312.001. Water-Level Altitude Data from the Periodic Network Fourth Quarter 1994. Submittal date: 01/19/1995. GS950508312312.005. Potentiometric-Surface Map, 1993, Yucca Mountain and Vicinity, Nevada. Submittal date: 06/06/1995. GS960208312312.003. 28 Water-Level Measurements from the Periodic Network, Third Quarter, 1995 (7/1/95 - 9/30/95). Submittal date: 02/20/1996. GS960908312312.010. Analysis of Water-Level Data in the Yucca Mountain Area, Nevada, 1985-1995. Submittal date: 09/19/1996. GS970600012847.001. Water Level Altitude Data Collected at GEXA Well 4 and USW G-4. Submittal date: 06/30/1997. GS991100002330.001. Water Level Data for Yucca Mountain Region and Amargosa Desert. Submittal date: 03/29/2000. GS991208314221.001. Geologic Map of the Yucca Mountain Region. Submittal date: 12/01/1999. MO0002COV00088.001. Coverage BoresQ2. Submittal date: 02/24/2000. MO0004NC99WL1D.000. Water Level Measurements in Boreholes, NC-EWDP-1D, NCEWDP- 1D Shallow, & NC-EWDP-1D Deep, Nye County Early Warning Drilling Program. Submittal date: 04/19/2000. MO0004NC99WL1S.000. Water Level Measurements in Borehole, NC-EWDP-1S, Nye County Early Warning Drilling Program. Submittal date: 04/18/2000. MO0004NC99WL1X.000. Water Level Measurements in Borehole, NC-EWDP-Washburn-1X, Nye County Early Warning Drilling Program. Submittal date: 04/17/2000. MO0004NC99WL2D.000. Water Level Measurements in Borehole, NC-EWDP-2D, Nye County Early Warning Drilling Program. Submittal date: 04/18/2000. MO0004NC99WL3D.000. Water Level Measurements in Borehole, NC-EWDP-3D, Nye County Early Warning Drilling Program. Submittal date: 04/18/2000. MO0004NC99WL3S.000. Water Level Measurements in Borehole, NC-EWDP-3S, Nye County Early Warning Drilling Program. Submittal date: 04/18/2000. Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 28 August 2000 MO0004NC99WL5S.000. Water Level Measurements in Borehole, NC-EWDP-5S, Nye County Early Warning Drilling Program. Submittal date: 04/19/2000. MO0004NC99WL9S.000. Water Level Measurements in Borehole, NC-EWDP-9S, Nye County Early Warning Drilling Program. Submittal date: 04/19/2000. TM0000000SD7RS.003. USW SD-7 Shift Drilling Summaries (1602.0'-2020.3'), Lithologic Logs (1600.0'-1925.0'), and Structure Logs (1632.0'-2020.3'). Submittal date: 09/22/1995. TM0000000SD9RS.001. USW SD-9 Shift Drilling Summaries, Structural Logs, and Lithological Logs. Submittal date: 08/23/1994. TM000000SD12RS.011. USW SD-12 Shift Drilling Summaries, Lithologic Logs, and Structure Logs from 1825.0'-2166.3'. Submittal date: 09/08/1995. 8.5 AMR OUTPUT DATA, LISTED BY DATA TRACKING NUMBER GS000508312332.001. Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model. Submittal date: 05/19/2000. ANL-NBS-HS-000034 REV 00 I-1 August 2000 ATTACHMENT I BOREHOLE DATA TOTAL PAGES: 28 Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-2 August 2000 The following sections describe the information pertaining to each of the columns in Attachment I. USGS Site Identification Unique site identifications (IDs) are assigned to each borehole for which the USGS maintains water-level data. Boreholes that contain multiple monitoring zones are assigned a unique site ID for each of the different zones. The site IDs are different than the site ID for the entire borehole, but usually contain a portion of the borehole site ID. Where more than one site ID for a given borehole exists (multiple monitoring zones), the site ID for the entire borehole is used in Attachment I. Site Name The common borehole site name available for a given site was recorded. CONTENTS TABLE I-1. EASTING, NORTHING, LAND SURFACE ALTITUDE, MEAN WATER-LEVEL ALTITUDE (DTN: GS000508312332.001)........................... I-3 TABLE I-2. NUMBER OF DATA POINTS USED, SOURCE, AND USE........................... I-7 TABLE I-3. RELIABILITY OF MEASUREMENTS ........................................................... I-11 TABLE I-4. EARLIEST YEAR OF MEASUREMENT, LATEST YEAR OF MEASUREMENT, MINIMUM WATER-LEVEL ALTITUDE, AND MAXIMUM WATER-LEVEL ALTITUDE (DTN: GS000508312332.001)........................................................................... I-14 TABLE I-5. TOP OF INTERVAL, BOTTOM OF INTERVAL, AND MIDPOINT OF INTERVAL........................................................................................................ I-17 TABLE I-6. INTERVAL DESCRIPTION AND ACCURACY OF LOCATION ................ I-20 TABLE I-7. ACCURACY OF LAND-SURFACE ALTITUDE AND LATEST WATER-LEVEL MEASUREMENT METHOD DESCRIPTION................... I-23 TABLE I-8. WATER LEVEL MEASUREMENT ACCURACY AND PERCHED?........... I-26 Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-3 August 2000 Table I-1. Easting, Northing, Land Surface Altitude, Mean Water-level Altitude (DTN: GS000508312332.001) Easting and Northing Coordinates for boreholes were compiled in USGS 2000b, and were taken from sources as noted therein (see Assumption 5.3). UTM easting and northing were calculated using ARCINFO PROJECT command. The latitude/longitude, or state plane coordinate, was projected into UTM (meters, Zone 11, North American Datum 1927) coordinates and rounded to the nearest meter. Land-surface Altitude (meters) The land-surface altitudes for boreholes were compiled in USGS 2000b, and were taken from sources as noted therein (see Assumption 5.3). The altitude was converted from feet to meters by the following formula, where necessary: Altitude (ft) x 0.3048 (m/ft) = Altitude (m) The altitude was rounded to the nearest tenth of a meter. Mean Water-level Altitude (meters) For the period between 1985 and 1995, the mean water-level altitude was tabulated by Graves et al. (1997, table 2). Graves et al. (1997) used monthly mean water-level altitudes computed from hourly transducer data and periodic manual water-level altitude measurements to compute the mean water-level altitude. The mean water level for each site not included in this report was calculated. An example calculation follows: (730.98+731.07+731.09)/3 = 731.0 The altitude was rounded to the nearest tenth of a meter, using software rounding. In addition, the following exceptions were made when calculating the mean: • NDOT well: Deleted the 1972 measurement (2,291.8 ft) from the calculation of the average. It is anomalously low and not representative of average conditions in the borehole. • Donald O. Heath well: Deleted the 1961 measurement (2,342.0 ft) from the calculation of the average. It is anomalously high and not representative of average conditions in the borehole. • Wm. R. Monroe well: Deleted the 1958 measurement (2,362.0 ft) from the calculation of the average. It is anomalously high and not representative of average conditions in the borehole. • Cooks West well: Deleted the 1963 measurement (2,324.6 ft) from the calculation of the average. It is anomalously low and not representative of average conditions in the borehole. • Cooks East well: Deleted the 2 measurements of 2,333.8 ft (12/20/1961) and 2,335.3 ft(04/09/1991) from the calculation of the average. They are anomalously low and not representative of average conditions in the borehole. • DeFir well: Used the data obtained after 1982 as being more representative of the calibration period. • Airport well: Deleted the 1964 measurement (2,348.8 ft) from the calculation of the average. It is anomalously high and not representative of average conditions in the borehole. • GEXA Well 4: Deleted 1991 measurement (3133.2 ft.) from the calculations of the average. It is anomalously low and not representative of average conditions in the borehole. USGS Site ID Site Name Easting Northing Land-surface Altitude (m) Mean Waterlevel Altitude (m) 365629116222602 UE-29 a #2 555753 4088351 1215.4 1187.7 365520116370301 GEXA Well 4 534069 4086110 1198.1 1009.0 365340116264601 UE-25 WT #6 549352 4083103 1314.8 1034.6 365322116273501 USW G-2 548143 4082542 1554.0 1020.2 365239116253401 UE-25 WT #16 551146 4081234 1210.9 738.3 365208116274001 USW UZ-14 548032 4080260 1348.9 779.0 365207116264201 UE-25 WT #18 549468 4080238 1336.4 730.8 365200116272901 USW G-1 548306 4080016 1325.9 754.2 365147116185301 UE-25 a #3 561084 4079697 1385.6 748.3 365140116260301 UE-25 WT #4 550439 4079412 1169.3 730.8 Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-4 August 2000 USGS Site ID Site Name Easting Northing Land-surface Altitude (m) Mean Waterlevel Altitude (m) 365116116233801 UE-25 WT #15 554034 4078694 1083.2 729.2 365114116270401 USW G-4 548933 4078602 1269.5 730.6 365105116262401 UE-25 a #1 549925 4078330 1199.2 731.0 365032116243501 UE-25 WT #14 552630 4077330 1076.4 729.7 365023116271801 USW WT-2 548595 4077028 1301.4 730.6 364947116254300 UE-25 c #1 550955 4075933 1130.6 730.2 364947116254501 UE-25 c #3 550930 4075902 1132.4 730.2 364947116254401 UE-25 c #2 550955 4075871 1132.2 730.2 364945116235001 UE-25 WT #13 553730 4075827 1032.5 729.1 364933116285701 USW WT- 7 546151 4075474 1196.9 775.8 364916116265601 USW WT- 1 549152 4074967 1201.4 730.4 364905116280101 USW G-3 547543 4074619 1480.6 730.5 364828116234001 UE-25 J -13 554017 4073517 1011.3 728.4 364825116290501 USW WT-10 545964 4073378 1123.4 776.0 364822116262601 UE-25 WT #17 549905 4073307 1124.0 729.7 365821116343701 USW VH-2 537738 4073214 974.5 810.4 364757116245801 UE-25 WT #3 552090 4072550 1030.0 729.6 364732116330701 USW VH-1 539976 4071714 963.5 779.4 364656116261601 UE-25 WT #12 550168 4070659 1074.7 729.5 364649116280201 USW WT-11 547542 4070428 1094.1 730.7 364554116232400 UE-25 J -12 554444 4068774 953.6 727.9 364528116232201 UE-25 JF #3 554498 4067974 944.4 727.8 364105116302601 Cind-R-Lite Well 544027 4059809 830.8 729.8 363907116235701 Ben Bossingham 553704 4056228 819.9 718.4 363836116234001 Fred Cobb 553808 4055459 811.4 702.8 363840116235000 Bob Whellock 553883 4055398 813.8 704.1 363840116234001 Louise Pereidra 554131 4055399 810.8 705.6 363840116233501 Joe Richards 554008 4055337 811.4 701.6 363835116234001 NDOT Well 553685 4055242 809.8 705.4 363742116263201 James H. Shaw 549863 4054911 795.5 706.7 363830116241401 Airport Well 552818 4054929 804.3 705.3 363815116175901 TW- 5 562604 4054686 931.5 725.1 363711116263701 Richard Washburn 549746 4053647 783.9 707.7 363621116263201 Richard Washburn 549679 4052322 774.2 704.4 363549116305001 Nye County Development Co 543481 4050069 742.2 694.3 363523116353701 Fred Wooldridge 536350 4050006 731.8 691.9 363525116325601 Fred J. Keefe 540673 4049994 735.2 694.3 363519116322001 Leslie Nickels 541518 4049937 737.0 694.3 363540116240801 L. Mason 553471 4049848 771.1 722.1 363527116292501 Unknown 545596 4049403 744.0 697.8 363521116352501 Davidson Well 536552 4049329 730.1 690.1 363456116335501 Eugene J. Mankinen 538889 4049000 740.7 707.4 363454116314201 Donald O. Heath 542194 4048892 733.7 694.1 363503116351501 Elvis Kelley 536903 4048621 727.9 691.0 363503116284001 Manuel Rodela 546718 4048669 740.7 693.6 363436116342301 Charles C. DeFir Jr. 538196 4048442 740.7 706.9 363436116333201 William R. Monroe 540035 4048450 731.5 693.7 363434116354001 DeFir Well 536655 4048405 727.1 690.2 Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-5 August 2000 USGS Site ID Site Name Easting Northing Land-surface Altitude (m) Mean Waterlevel Altitude (m) 363438116324601 Edwin H. Mankinen 540608 4048083 727.9 695.2 363442116363301 Bill Strickland 534967 4047966 725.7 689.2 363440116282401 M. Meese 547120 4047963 731.5 686.4 363415116275101 Theo E. Selbach 547941 4047782 741.9 696.2 363407116342501 C.L. Caldwell 537727 4047670 723.3 691.4 363407116243501 Leonard Siegel 552390 4047685 762.0 709.0 363429116315901 James K. Pierce 541778 4047596 729.1 690.4 363405116321501 James K. Pierce 541381 4047563 740.7 705.6 363428116240301 Cooks West Well 553609 4047631 754.3 720.1 363428116234701 Cooks East Well 554006 4047633 755.2 718.9 363417116271801 Nye County Land Company 548466 4047261 740.7 690.1 363411116272901 Amargosa Town Complex 548492 4047077 739.1 688.8 363410116261101 Nye County Development Co 550431 4047057 743.7 691.2 363410116240301 Lewis C. Cook 553612 4047076 748.6 717.4 363410116240001 Lewis C. Cook 553687 4047077 749.8 714.8 363407116273301 Amargosa Valley Water 548393 4046953 737.9 701.3 363342116335701 Earl N. Selbach 539147 4046844 723.9 696.5 363340116332901 Lewis N. Dansby 539968 4046817 724.2 694.2 363342116325101 Edwin H. Mankinen 540788 4046821 724.2 694.0 363350116252101 Willard Johns 552097 4046882 746.8 699.5 365157116271202 USW H-1 tube 1 548727 4079926 1303.0 785.5 365157116271203 USW H-1 tube 2 548727 4079926 1303.0 736.0 365157116271204 USW H-1 tube 3 548727 4079926 1303.0 730.6 365157116271205 USW H-1 tube 4 548727 4079926 1303.0 730.8 365122116275502 USW H-5 upper 547668 4078841 1478.9 775.5 365122116275503 USW H-5 lower 547668 4078841 1478.9 775.6 365108116262302 UE-25 b #1 lower 549949 4078423 1200.7 729.7 365108116262303 UE-25 b #1 upper 549949 4078423 1200.7 730.6 365049116285502 USW H-6 upper 546188 4077816 1301.8 776.0 365049116285505 USW H-6 lower 546188 4077816 1301.8 775.9 365032116265402 USW H-4 upper 549188 4077309 1248.5 730.4 365032116265403 USW H-4 lower 549188 4077309 1248.5 730.5 364942116280002 USW H-3 upper 547562 4075759 1483.2 731.5 364942116280003 USW H-3 lower 547562 4075759 1483.2 755.9 364938116252102 UE-25 p #1 (Lwr Intrvl) 551501 4075659 1114.2 752.4 not available yet USW SD-7 548384 4076499 1363.1 727.6 not available yet USW SD-9 548550 4079256 1303.4 731.1 not available yet USW SD-12 548492 4077415 1323.7 730.0 not available yet NC-EWDP-1D 536768 4062502 803.6 787.2 not available yet NC-EWDP-1S 536771 4062498 803.8 787.9 not available yet NC-EWDP-2D 547744 4057164 801.2 706.2 not available yet NC-EWDP-3D 541273 4059444 799.4 718.9 not available yet NC-EWDP-3S 541269 4059445 798.8 719.6 not available yet NC-EWDP-5S 555676 4058229 840.3 725.9 not available yet NC-EWDP-9S 539039 4061004 797.3 767.2 not available yet NC-Washburn-1X 551465 4057563 824.1 714.6 364706116170601 UE-25 J -11 563799 4071058 1049.5 732.2 364237116365401 BGMW-11 534386 4062600 787.9 715.9 Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-6 August 2000 USGS Site ID Site Name Easting Northing Land-surface Altitude (m) Mean Waterlevel Altitude (m) 363709116264601 Richard Washburn 549529 4052567 775.7 704.0 363409116233701 L. Cook 551348 4047432 755.9 713.2 363411116264701 Unknown 549532 4047668 745.2 689.5 363428116281201 Amargosa Water 547420 4047594 738.2 690.4 363429116233401 Lewis C. Cook 554329 4047666 755.3 715.7 363511116335101 Unknown 538989 4048877 729.4 690.8 365624116222901 USW UZ-N91 555680 4088196 1203.0 1186.7 Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-7 August 2000 Table I-2. Number of Data Points Used, Source, and Use Number of Data Points Used The number of data points used to determine the mean (Table I-1) was tabulated. Source The Data Tracking Number for the source from which the water-level data used to determine the mean (Table I-1) and minimum and maximum (Table I-4) water level altitude is tabulated. Use The most appropriate use for each water level was identified: Potentiometric-surface map and calibration (WT) Calibration (C) Unreliable (U) and therefore not used in the construction of the potentiometric-surface map. It is recommended that these waterlevel observations not be used for SZ site-scale model calibration. A water-level measurement was identified as applicable for potentiometric-surface map construction if it was: The water level from the upper interval (or only interval) from a borehole. The water-level interval in the shallow (uppermost) aquifer system, typically the volcanic- or alluvial-aquifer system. A water-level measurement was identified as unreliable on the basis of the criteria listed in Section 6.1.9. In addition, the following boreholes contained in Attachment I were excluded from this analysis for the reasons stated below: • Two Lewis C. Cook boreholes ( ID numbers 363410116240001 and 363410116240301): The data for these boreholes consist of two water-level measurements in each borehole that span more than 20 years and differ by quite a bit. An average of the two values for each of these boreholes does not produce a water level that is representative of the early 1990's. The average is considered “Unreliable.” There are other boreholes nearby that have reliable water levels that are sufficient for the SZ site-scale modeling. • Fred Cobb well: Basically similar arguments apply as for the Lewis C. Cook boreholes. It is not critical to include the water-level data from this borehole. • Fred Woolridge well: Basically similar arguments apply as for the Lewis C. Cook boreholes. It is not critical to include these data. The remaining water-level data were labeled as suitable for calibration only. Calibration of the SZ site-scale model should include all data except that labeled as unreliable (U). USGS Site ID Site Name Number of Data Points Used Source Use 365629116222602 UE-29 a #2 208 GS991100002330.001 WT 365520116370301 GEXA Well 4 52 GS991100002330.001 WT 365340116264601 UE-25 WT #6 117 GS960908312312.010 WT 365322116273501 USW G-2 28 GS960908312312.010 WT 365239116253401 UE-25 WT #16 123 GS960908312312.010 WT 365208116274001 USW UZ-14 Estimate GS950508312312.005 WT 365207116264201 UE-25 WT #18 38 GS960908312312.010 WT 365200116272901 USW G-1 1 GS991100002330.001 WT 365147116185301 UE-25 a #3 1 GS991100002330.001 WT 365140116260301 UE-25 WT #4 131 GS960908312312.010 WT 365116116233801 UE-25 WT #15 124 GS960908312312.010 WT 365114116270401 USW G-4 29 GS931008312312.025 GS970600012847.001 GS991100002330.001 WT 365105116262401 UE-25 a #1 40 GS991100002330.001 WT 365032116243501 UE-25 WT #14 135 GS960908312312.010 WT 365023116271801 USW WT-2 106 GS960908312312.010 WT 364947116254300 UE-25 c #1 3 GS991100002330.001 WT Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-8 August 2000 USGS Site ID Site Name Number of Data Points Used Source Use 364947116254501 UE-25 c #3 8 GS960208312312.003 GS000608312312.004 GS000708312312.005 GS000408312312.001 WT 364947116254401 UE-25 c #2 10 GS930408312312.015 GS000608312312.004 GS000708312312.005 GS000408312312.001 GS950108312312.001 WT 364945116235001 UE-25 WT #13 118 GS960908312312.010 WT 364933116285701 USW WT- 7 113 GS960908312312.010 WT 364916116265601 USW WT- 1 128 GS960908312312.010 WT 364905116280101 USW G-3 113 GS960908312312.010 WT 364828116234001 UE-25 J -13 121 GS960908312312.010 WT 364825116290501 USW WT-10 132 GS960908312312.010 WT 364822116262601 UE-25 WT #17 117 GS960908312312.010 WT 365821116343701 USW VH-2 1 GS991100002330.001 WT 364757116245801 UE-25 WT #3 119 GS960908312312.010 WT 364732116330701 USW VH-1 147 GS960908312312.010 WT 364656116261601 UE-25 WT #12 123 GS960908312312.010 WT 364649116280201 USW WT-11 119 GS960908312312.010 WT 364554116232400 UE-25 J -12 100 GS960908312312.010 WT 364528116232201 UE-25 JF #3 234 GS991100002330.001 WT 364105116302601 Cind-R-Lite Well 62 GS991100002330.001 WT 363907116235701 Ben Bossingham 1 GS991100002330.001 U 363836116234001 Fred Cobb 2 GS991100002330.001 U 363840116235000 Bob Whellock 1 GS991100002330.001 U 363840116234001 Louise Pereidra 1 GS991100002330.001 U 363840116233501 Joe Richards 1 GS991100002330.001 U 363835116234001 NDOT Well 87 GS991100002330.001 WT 363742116263201 James H. Shaw 3 GS991100002330.001 WT 363830116241401 Airport Well 90 GS991100002330.001 WT 363815116175901 TW- 5 99 GS991100002330.001 WT 363711116263701 Richard Washburn 4 GS991100002330.001 U 363621116263201 Richard Washburn 1 GS991100002330.001 U 363549116305001 Nye County Development Co 3 GS991100002330.001 WT 363523116353701 Fred Wooldridge 3 GS991100002330.001 U 363525116325601 Fred J. Keefe 6 GS991100002330.001 WT 363519116322001 Leslie Nickels 4 GS991100002330.001 WT 363540116240801 L. Mason 22 GS991100002330.001 WT 363527116292501 Unknown 2 GS991100002330.001 WT 363521116352501 Davidson Well 63 GS991100002330.001 WT 363456116335501 Eugene J. Mankinen 4 GS991100002330.001 U 363454116314201 Donald O. Heath 4 GS991100002330.001 WT 363503116351501 Elvis Kelley 3 GS991100002330.001 WT 363503116284001 Manuel Rodela 2 GS991100002330.001 WT 363436116342301 Charles C. DeFir Jr. 5 GS991100002330.001 WT 363436116333201 William R. Monroe 4 GS991100002330.001 WT 363434116354001 DeFir Well 19 GS991100002330.001 WT Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-9 August 2000 USGS Site ID Site Name Number of Data Points Used Source Use 363438116324601 Edwin H. Mankinen 4 GS991100002330.001 WT 363442116363301 Bill Strickland 1 GS991100002330.001 WT 363440116282401 M. Meese 1 GS991100002330.001 U 363415116275101 Theo E. Selbach 1 GS991100002330.001 U 363407116342501 C.L. Caldwell 3 GS991100002330.001 WT 363407116243501 Leonard Siegel 1 GS991100002330.001 U 363429116315901 James K. Pierce 3 GS991100002330.001 WT 363405116321501 James K. Pierce 2 GS991100002330.001 U 363428116240301 Cooks West Well 3 GS991100002330.001 WT 363428116234701 Cooks East Well 88 GS991100002330.001 WT 363417116271801 Nye County Land Company 2 GS991100002330.001 WT 363411116272901 Amargosa Town Complex 1 GS991100002330.001 WT 363410116261101 Nye County Development Co 1 GS991100002330.001 WT 363410116240301 Lewis C. Cook 2 GS991100002330.001 U 363410116240001 Lewis C. Cook 2 GS991100002330.001 U 363407116273301 Amargosa Valley Water 1 GS991100002330.001 WT 363342116335701 Earl N. Selbach 1 GS991100002330.001 U 363340116332901 Lewis N. Dansby 48 GS991100002330.001 WT 363342116325101 Edwin H. Mankinen 46 GS991100002330.001 WT 363350116252101 Willard Johns 2 GS991100002330.001 U 365157116271202 USW H-1 tube 1 101 GS960908312312.010 C 365157116271203 USW H-1 tube 2 75 GS960908312312.010 C 365157116271204 USW H-1 tube 3 108 GS960908312312.010 C 365157116271205 USW H-1 tube 4 124 GS960908312312.010 WT 365122116275502 USW H-5 upper 106 GS960908312312.010 WT 365122116275503 USW H-5 lower 54 GS960908312312.010 C 365108116262302 UE-25 b #1 lower 67 GS960908312312.010 C 365108116262303 UE-25 b #1 upper 99 GS960908312312.010 WT 365049116285502 USW H-6 upper 118 GS960908312312.010 WT 365049116285505 USW H-6 lower 79 GS960908312312.010 C 365032116265402 USW H-4 upper 128 GS960908312312.010 WT 365032116265403 USW H-4 lower 101 GS960908312312.010 C 364942116280002 USW H-3 upper 128 GS960908312312.010 WT 364942116280003 USW H-3 lower 59 GS960908312312.010 C 364938116252102 UE-25 p #1(Lwr Intrvl) 120 GS960908312312.010 C not available yet USW SD-7 1 TM0000000SD7RS.003 WT not available yet USW SD-9 1 TM0000000SD9RS.001 WT not available yet USW SD-12 1 TM000000SD12RS.011 WT not available yet NC-EWDP-1D 5 MO0004NC99WL1D.000 WT not available yet NC-EWDP-1S 1 MO0004NC99WL1S.000 WT not available yet NC-EWDP-2D 2 MO0004NC99WL2D.000 WT not available yet NC-EWDP-3D 15 MO0004NC99WL3D.000 WT not available yet NC-EWDP-3S 3 MO0004NC99WL3S.000 WT not available yet NC-EWDP-5S 19 MO0004NC99WL5S.000 WT not available yet NC-EWDP-9S 6 MO0004NC99WL9S.000 WT not available yet NC-Washburn-1X 18 MO0004NC99WL1X.000 WT 364706116170601 UE-25 J -11 71 GS960908312312.010 WT 364237116365401 BGMW-11 51 GS991100002330.001 WT Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-10 August 2000 USGS Site ID Site Name Number of Data Points Used Source Use 363709116264601 Richard Washburn 1 GS991100002330.001 WT 363409116233701 L. Cook 1 GS991100002330.001 U 363411116264701 Unknown 1 GS991100002330.001 WT 363428116281201 Amargosa Water 1 GS991100002330.001 WT 363429116233401 Lewis C. Cook 1 GS991100002330.001 WT 363511116335101 Unknown 1 GS991100002330.001 WT 365624116222901 USW UZ-N91 209 GS991100002330.001 WT Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-11 August 2000 Table I-3. Reliability of Measurements Reliability of Measurements Using professional judgement, an assessment of the overall reliability of the average water-level data to represent 1990’s water levels (Table I-1) was made. The following categories were assigned: Best (average water level documented in Graves et al. 1997) Reliable (all others not identified in the other four categories) Less Reliable (less than 5 water-level measurements) or (latest measurement made prior to 1980) Unreliable (less than 5 measurements made prior to 1980) USGS Site ID Site Name Reliability of Measurements 365629116222602 UE-29 a #2 Reliable 365520116370301 GEXA Well 4 Reliable 365340116264601 UE-25 WT #6 Best 365322116273501 USW G-2 Best 365239116253401 UE-25 WT #16 Best 365208116274001 USW UZ-14 Less Reliable (less than 5 measurements) 365207116264201 UE-25 WT #18 Best 365200116272901 USW G-1 Less Reliable (less than 5 measurements) 365147116185301 UE-25 a #3 Less Reliable (less than 5 measurements) 365140116260301 UE-25 WT #4 Best 365116116233801 UE-25 WT #15 Best 365114116270401 USW G-4 Reliable 365105116262401 UE-25 a #1 Reliable 365032116243501 UE-25 WT #14 Best 365023116271801 USW WT-2 Best 364947116254300 UE-25 c #1 Less Reliable (less than 5 measurements) 364947116254501 UE-25 c #3 Reliable 364947116254401 UE-25 c #2 Reliable 364945116235001 UE-25 WT #13 Best 364933116285701 USW WT- 7 Best 364916116265601 USW WT- 1 Best 364905116280101 USW G-3 Best 364828116234001 UE-25 J -13 Best 364825116290501 USW WT-10 Best 364822116262601 UE-25 WT #17 Best 365821116343701 USW VH-2 Less Reliable (less than 5 measurements) 364757116245801 UE-25 WT #3 Best 364732116330701 USW VH-1 Best 364656116261601 UE-25 WT #12 Best 364649116280201 USW WT-11 Best 364554116232400 UE-25 J -12 Best 364528116232201 UE-25 JF #3 Reliable 364105116302601 Cind-R-Lite Well Reliable 363907116235701 Ben Bossingham Unreliable (less than 5 measurements before 1980) 363836116234001 Fred Cobb Unreliable (less than 5 measurements before 1980) 363840116235000 Bob Whellock Unreliable (less than 5 measurements before 1980) 363840116234001 Louise Pereidra Unreliable (less than 5 measurements before 1980) 363840116233501 Joe Richards Unreliable (less than 5 measurements before 1980) 363835116234001 NDOT Well Reliable 363742116263201 James H. Shaw Less Reliable (less than 5 measurements) Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-12 August 2000 USGS Site ID Site Name Reliability of Measurements 363830116241401 Airport Well Reliable 363815116175901 TW- 5 Reliable 363711116263701 Richard Washburn Unreliable (less than 5 measurements before 1980) 363621116263201 Richard Washburn Unreliable (less than 5 measurements before 1980) 363549116305001 Nye County Development Co Less Reliable (less than 5 measurements) 363523116353701 Fred Wooldridge Unreliable (less than 5 measurements before 1980) 363525116325601 Fred J. Keefe Reliable 363519116322001 Leslie Nickels Less Reliable (less than 5 measurements) 363540116240801 L. Mason Less Reliable (latest Measurement prior to 1980) 363527116292501 Unknown Less Reliable (less than 5 measurements) 363521116352501 Davidson Well Reliable 363456116335501 Eugene J. Mankinen Unreliable (less than 5 measurements before 1980) 363454116314201 Donald O. Heath Reliable 363503116351501 Elvis Kelley Less Reliable (less than 5 measurements) 363503116284001 Manuel Rodela Less Reliable (less than 5 measurements) 363436116342301 Charles C. DeFir Jr. Reliable 363436116333201 William R. Monroe Reliable 363434116354001 DeFir Well Reliable 363438116324601 Edwin H. Mankinen Less Reliable (less than 5 measurements) 363442116363301 Bill Strickland Less Reliable (less than 5 measurements) 363440116282401 M. Meese Unreliable (less than 5 measurements before 1980) 363415116275101 Theo E. Selbach Unreliable (less than 5 measurements before 1980) 363407116342501 C.L. Caldwell Less Reliable (less than 5 measurements) 363407116243501 Leonard Siegel Unreliable (less than 5 measurements before 1980) 363429116315901 James K. Pierce Less Reliable (less than 5 measurements) 363405116321501 James K. Pierce Unreliable (less than 5 measurements before 1980) 363428116240301 Cooks West Well Less Reliable (less than 5 measurements) 363428116234701 Cooks East Well Reliable 363417116271801 Nye County Land Company Less Reliable (less than 5 measurements) 363411116272901 Amargosa Town Complex Less Reliable (less than 5 measurements) 363410116261101 Nye County Development Co Less Reliable (less than 5 measurements) 363410116240301 Lewis C. Cook Unreliable (less than 5 measurements before 1980) 363410116240001 Lewis C. Cook Unreliable (less than 5 measurements before 1980) 363407116273301 Amargosa Valley Water Less Reliable (less than 5 measurements) 363342116335701 Earl N. Selbach Unreliable (less than 5 measurements before 1980) 363340116332901 Lewis N. Dansby Reliable 363342116325101 Edwin H. Mankinen Less Reliable (latest Measurement prior to 1980) 363350116252101 Willard Johns Unreliable (less than 5 measurements before 1980) 365157116271202 USW H-1 tube 1 Best 365157116271203 USW H-1 tube 2 Best 365157116271204 USW H-1 tube 3 Best 365157116271205 USW H-1 tube 4 Best 365122116275502 USW H-5 upper Best 365122116275503 USW H-5 lower Best 365108116262302 UE-25 b #1 lower Best 365108116262303 UE-25 b #1 upper Best 365049116285502 USW H-6 upper Best 365049116285505 USW H-6 lower Best 365032116265402 USW H-4 upper Best Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-13 August 2000 USGS Site ID Site Name Reliability of Measurements 365032116265403 USW H-4 lower Best 364942116280002 USW H-3 upper Best 364942116280003 USW H-3 lower Best 364938116252102 UE-25 p #1(Lwr Intrvl) Best not available yet USW SD-7 Less Reliable (less than 5 measurements) not available yet USW SD-9 Less Reliable (less than 5 measurements) not available yet USW SD-12 Less Reliable (less than 5 measurements) not available yet NC-EWDP-1D Reliable not available yet NC-EWDP-1S Less Reliable (less than 5 measurements) not available yet NC-EWDP-2D Less Reliable (less than 5 measurements) not available yet NC-EWDP-3D Reliable not available yet NC-EWDP-3S Less Reliable (less than 5 measurements) not available yet NC-EWDP-5S Reliable not available yet NC-EWDP-9S Reliable not available yet NC-Washburn-1X Reliable 364706116170601 UE-25 J -11 Best 364237116365401 BGMW-11 Reliable 363709116264601 Richard Washburn Less Reliable (less than 5 measurements) 363409116233701 L. Cook Unreliable (less than 5 measurements before 1980) 363411116264701 Unknown Less Reliable (less than 5 measurements) 363428116281201 Amargosa Water Less Reliable (less than 5 measurements) 363429116233401 Lewis C. Cook Less Reliable (less than 5 measurements) 363511116335101 Unknown Less Reliable (less than 5 measurements) 365624116222901 USW UZ-N91 Reliable Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-14 August 2000 Table I-4. Earliest Year of Measurement, Latest Year of Measurement, Minimum Water-level Altitude, and Maximum Water-level Altitude (DTN: GS000508312332.001) Earliest Year of Measurement/Latest Year of Measurement The earliest and latest year of reported measurement used in the calculation of the mean was determined and recorded. The data tabulated by Graves et al. (1997) were not checked for earlier or later measurements. The data reported in Graves et al. (1997) were collected for the water-level monitoring studies being conducted as part of Yucca Mountain site characterization activities and, as such, were collected after 1986 under an approved quality assurance program. Minimum Water-level Altitude/Maximum Water-level Altitude (meters) The smallest and largest water-level altitudes for the data used to calculate mean water-level altitude were compiled and tabulated. The altitude was converted from feet to meters by the following formula, where necessary: Altitude (ft) x 0.3048 (m/ft) = Altitude (m) The altitude was rounded to the nearest tenth of a meter. USGS Site ID Site Name Earliest Year of Measurement Latest Year of Measurement Minimum Water-level Altitude (m) Maximum Water-level Altitude (m) 365629116222602 UE-29 a #2 1985 1996 1186.2 1191.3 365520116370301 GEXA Well 4 1989 1996 995.3 1010.1 365340116264601 UE-25 WT #6 1985 1995 1033.3 1036.1 365322116273501 USW G-2 1992 1995 1019.6 1020.6 365239116253401 UE-25 WT #16 1985 1995 737.8 738.6 365208116274001 USW UZ-14 N/A N/A N/A N/A 365207116264201 UE-25 WT #18 1991 1995 730.5 730.9 365200116272901 USW G-1 1982 1982 754.2 754.2 365147116185301 UE-25 a #3 1979 1979 748.3 748.3 365140116260301 UE-25 WT #4 1985 1995 730.3 731.2 365116116233801 UE-25 WT #15 1985 1995 729.0 729.4 365114116270401 USW G-4 1983 1990 730.0 730.9 365105116262401 UE-25 a #1 1982 1985 730.7 731.2 365032116243501 UE-25 WT #14 1985 1995 729.3 730.0 365023116271801 USW WT-2 1985 1995 730.1 730.8 364947116254300 UE-25 c #1 1983 1984 730.1 730.3 364947116254501 UE-25 c #3 1989 1995 730.1 730.3 364947116254401 UE-25 c #2 1989 1995 729.9 730.6 364945116235001 UE-25 WT #13 1985 1995 728.5 729.4 364933116285701 USW WT- 7 1985 1995 775.5 776.0 364916116265601 USW WT- 1 1985 1995 730.0 730.5 364905116280101 USW G-3 1985 1995 730.0 730.8 364828116234001 UE-25 J -13 1986 1995 728.3 728.7 364825116290501 USW WT-10 1985 1995 775.6 776.2 364822116262601 UE-25 WT #17 1985 1995 729.5 729.8 365821116343701 USW VH-2 1983 1983 810.4 810.4 364757116245801 UE-25 WT #3 1985 1995 729.4 729.9 364732116330701 USW VH-1 1985 1995 779.3 779.6 364656116261601 UE-25 WT #12 1985 1995 729.1 729.6 364649116280201 USW WT-11 1985 1995 730.2 730.8 364554116232400 UE-25 J -12 1989 1995 727.8 728.2 364528116232201 UE-25 JF #3 1992 1998 727.3 728.1 Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-15 August 2000 USGS Site ID Site Name Earliest Year of Measurement Latest Year of Measurement Minimum Water-level Altitude (m) Maximum Water-level Altitude (m) 364105116302601 Cind-R-Lite Well 1992 1998 727.1 729.9 363907116235701 Ben Bossingham 1961 1961 718.4 718.4 363836116234001 Fred Cobb 1964 1990 700.1 705.4 363840116235000 Bob Whellock 1955 1955 704.1 704.1 363840116234001 Louise Pereidra 1952 1952 705.6 705.6 363840116233501 Joe Richards 1955 1955 701.6 701.6 363835116234001 NDOT Well 1991 1998 704.9 705.6 363742116263201 James H. Shaw 1953 1987 705.4 708.1 363830116241401 Airport Well 1987 1998 705.2 705.5 363815116175901 TW- 5 1962 1998 724.8 729.2 363711116263701 Richard Washburn 1958 1962 706.1 709.3 363621116263201 Richard Washburn 1958 1958 704.4 704.4 363549116305001 Nye County Development Co 1963 1987 691.3 695.9 363523116353701 Fred Wooldridge 1960 1984 688.4 694.0 363525116325601 Fred J. Keefe 1960 1987 691.4 696.3 363519116322001 Leslie Nickels 1962 1987 693.5 696.1 363540116240801 L. Mason 1963 1973 721.5 726.0 363527116292501 Unknown 1962 1987 696.9 698.7 363521116352501 Davidson Well 1963 1998 689.7 692.0 363456116335501 Eugene J. Mankinen 1961 1962 707.1 707.7 363454116314201 Donald O. Heath 1962 1987 693.2 696.2 363503116351501 Elvis Kelley 1984 1987 690.5 691.3 363503116284001 Manuel Rodela 1965 1987 692.2 694.9 363436116342301 Charles C. DeFir Jr. 1959 1987 705.3 708.8 363436116333201 William R. Monroe 1962 1987 691.5 696.0 363434116354001 DeFir Well 1987 1993 689.1 690.4 363438116324601 Edwin H. Mankinen 1961 1987 692.4 698.0 363442116363301 Bill Strickland 1982 1982 689.2 689.2 363440116282401 M. Meese 1962 1962 686.4 686.4 363415116275101 Theo E. Selbach 1958 1958 696.2 696.2 363407116342501 C.L. Caldwell 1958 1984 690.1 692.8 363407116243501 Leonard Siegel 1962 1962 709.0 709.0 363429116315901 James K. Pierce 1965 1987 689.5 692.1 363405116321501 James K. Pierce 1960 1962 704.7 706.6 363428116240301 Cooks West Well 1987 1991 719.6 720.4 363428116234701 Cooks East Well 1987 1998 717.7 720.3 363417116271801 Nye County Land Company 1962 1984 688.3 691.9 363411116272901 Amargosa Town Complex 1980 1980 688.8 688.8 363410116261101 Nye County Development Co 1987 1987 691.2 691.2 363410116240301 Lewis C. Cook 1966 1987 714.0 720.9 363410116240001 Lewis C. Cook 1962 1987 705.9 723.6 363407116273301 Amargosa Valley Water 1988 1988 701.3 701.3 363342116335701 Earl N. Selbach 1958 1958 696.5 696.5 363340116332901 Lewis N. Dansby 1954 1987 692.4 696.2 363342116325101 Edwin H. Mankinen 1955 1974 692.7 695.1 363350116252101 Willard Johns 1959 1962 698.5 700.4 Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-16 August 2000 USGS Site ID Site Name Earliest Year of Measurement Latest Year of Measurement Minimum Water-level Altitude (m) Maximum Water-level Altitude (m) 365157116271202 USW H-1 tube 1 1985 1995 785.0 786.1 365157116271203 USW H-1 tube 2 1985 1995 735.7 736.3 365157116271204 USW H-1 tube 3 1985 1995 730.4 730.8 365157116271205 USW H-1 tube 4 1985 1995 730.5 731.0 365122116275502 USW H-5 upper 1985 1995 775.0 775.7 365122116275503 USW H-5 lower 1985 1995 775.0 775.9 365108116262302 UE-25 b #1 lower 1985 1995 728.5 730.3 365108116262303 UE-25 b #1 upper 1985 1995 730.5 730.8 365049116285502 USW H-6 upper 1985 1995 775.8 776.2 365049116285505 USW H-6 lower 1988 1995 775.7 776.1 365032116265402 USW H-4 upper 1985 1995 730.2 730.5 365032116265403 USW H-4 lower 1985 1995 730.2 730.8 364942116280002 USW H-3 upper 1985 1995 731.1 731.9 364942116280003 USW H-3 lower 1991 1995 747.4 759.6 364938116252102 UE-25 p #1(Lwr Intrvl) 1985 1995 751.9 752.7 not available yet USW SD-7 1995 1995 727.6 727.6 not available yet USW SD-9 1994 1994 731.1 731.1 not available yet USW SD-12 1995 1995 730.0 730.0 not available yet NC-EWDP-1D 1999 1999 786.9 787.5 not available yet NC-EWDP-1S 1999 1999 787.9 787.9 not available yet NC-EWDP-2D 1999 1999 706.1 706.2 not available yet NC-EWDP-3D 1999 1999 718.4 720.2 not available yet NC-EWDP-3S 1999 1999 719.6 719.6 not available yet NC-EWDP-5S 1999 1999 725.8 726.1 not available yet NC-EWDP-9S 1999 1999 767.2 767.3 not available yet NC-Washburn-1X 1999 1999 714.5 714.6 364706116170601 UE-25 J -11 1989 1995 732.1 732.4 364237116365401 BGMW-11 1989 1999 715.5 716.2 363709116264601 Richard Washburn 1987 1987 704.0 704.0 363409116233701 L. Cook 1962 1962 713.2 713.2 363411116264701 Unknown 1987 1987 689.5 689.5 363428116281201 Amargosa Water 1987 1987 690.4 690.4 363429116233401 Lewis C. Cook 1987 1987 715.7 715.7 363511116335101 Unknown 1987 1987 690.8 690.8 365624116222901 USW UZ-N91 1986 1996 1185.6 1191.3 Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-17 August 2000 Table I-5. Top of Interval, Bottom of Interval, and Midpoint of Interval Top of Interval/Bottom of Interval (meters) Where available, the altitude of the top and bottom of screened or packed-off intervals were used. If the altitude of the screened or packed-off interval was not available, the borehole was treated as an open borehole. If the altitude of the bottom of a borehole interval was not available, the altitude of the base of the borehole was used for the bottom of the interval. Likewise, if the altitude of the top of a borehole interval was not available, the maximum water level was used for the altitude of the top of the interval. The altitudes were converted from feet to meters by the following formula: Altitude (ft) x 0.3048 (m/ft) = Altitude (m) The altitude was rounded to the nearest tenth of a meter. Midpoint of Interval (meters) Most of the water levels represent a composite water-level altitude for a borehole. Composite water-level altitudes refer to water levels derived from a open interval, in which any portion of the open interval may contribute to the water level. Because the altitude at which the hydraulic head measurement applies is uncertain, the midpoint of either the water column for open (uncased) boreholes or the midpoint of a screened or packed-off interval within the borehole is identified. The altitude of the midpoint of the interval was calculated by the following formula: Midpoint = (Top+Bottom)/2 The altitude was rounded to the nearest tenth of a meter. Sources Sources are tabulated in Table I-2 USGS Site ID Site Name Top of Interval (m) Bottom of Interval (m) Midpoint of Interval (m) 365629116222602 UE-29 a #2 1187.7 793.9 990.8 365520116370301 GEXA Well 4 1008.0 710.5 859.2 365340116264601 UE-25 WT #6 1034.6 931.8 983.2 365322116273501 USW G-2 1020.2 748.0 884.1 365239116253401 UE-25 WT #16 738.3 689.9 714.1 365208116274001 USW UZ-14 915.9 670.9 793.4 365207116264201 UE-25 WT #18 730.8 713.4 722.1 365200116272901 USW G-1 754.2 -502.9 125.7 365147116185301 UE-25 a #3 748.3 614.5 681.4 365140116260301 UE-25 WT #4 730.8 687.3 709.0 365116116233801 UE-25 WT #15 729.2 668.2 698.7 365114116270401 USW G-4 730.1 354.2 542.2 365105116262401 UE-25 a #1 731.0 436.9 584.0 365032116243501 UE-25 WT #14 729.7 677.4 703.6 365023116271801 USW WT-2 730.7 673.4 702.0 364947116254300 UE-25 c #1 730.3 216.2 473.2 364947116254501 UE-25 c #3 730.3 218.3 474.3 364947116254401 UE-25 c #2 730.2 376.3 553.2 364945116235001 UE-25 WT #13 729.1 678.5 703.8 364933116285701 USW WT- 7 775.8 705.9 740.9 364916116265601 USW WT- 1 730.4 686.4 708.4 364905116280101 USW G-3 688.6 -52.4 318.1 364828116234001 UE-25 J -13 707.7 1.8 354.8 364825116290501 USW WT-10 776.0 692.4 734.2 364822116262601 UE-25 WT #17 729.7 681.0 705.4 Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-18 August 2000 USGS Site ID Site Name Top of Interval (m) Bottom of Interval (m) Midpoint of Interval (m) 365821116343701 USW VH-2 810.5 -244.8 282.8 364757116245801 UE-25 WT #3 729.6 682.0 705.8 364732116330701 USW VH-1 779.4 201.5 490.5 364656116261601 UE-25 WT #12 729.5 675.7 702.6 364649116280201 USW WT-11 730.7 653.1 691.9 364554116232400 UE-25 J -12 712.6 606.6 659.6 364528116232201 UE-25 JF #3 727.8 597.5 662.7 364105116302601 Cind-R-Lite Well 729.8 690.6 710.2 363907116235701 Ben Bossingham 718.4 676.4 697.4 363836116234001 Fred Cobb 702.8 648.3 675.6 363840116235000 Bob Whellock 704.1 659.9 682.0 363840116234001 Louise Pereidra 705.6 690.4 698.0 363840116233501 Joe Richards 701.7 656.9 679.3 363835116234001 NDOT Well 705.3 658.9 682.1 363742116263201 James H. Shaw 706.7 621.8 664.3 363830116241401 Airport Well 705.5 567.5 636.5 363815116175901 TW- 5 725.1 652.3 688.7 363711116263701 Richard Washburn 707.7 632.2 669.9 363621116263201 Richard Washburn 704.4 646.2 675.3 363549116305001 Nye County Development Co 694.4 582.8 638.6 363523116353701 Fred Wooldridge 691.9 655.6 673.8 363525116325601 Fred J. Keefe 694.3 659.0 676.7 363519116322001 Leslie Nickels 694.4 615.1 654.7 363540116240801 L. Mason 722.1 676.4 699.2 363527116292501 Unknown 697.8 637.4 667.6 363521116352501 Davidson Well 690.2 653.9 672.0 363456116335501 Eugene J. Mankinen 707.4 649.9 678.6 363454116314201 Donald O. Heath 698.1 605.0 651.6 363503116351501 Elvis Kelley 691.0 679.1 685.1 363503116284001 Manuel Rodela 693.6 679.7 686.7 363436116342301 Charles C. DeFir Jr. 706.9 664.5 685.7 363436116333201 William R. Monroe 699.0 640.1 669.5 363434116354001 DeFir Well 691.3 650.9 671.1 363438116324601 Edwin H. Mankinen 695.2 630.3 662.8 363442116363301 Bill Strickland 689.2 664.8 677.0 363440116282401 M. Meese 686.4 642.8 664.6 363415116275101 Theo E. Selbach 696.2 650.5 673.3 363407116342501 C.L. Caldwell 691.4 617.5 654.5 363407116243501 Leonard Siegel 709.0 625.5 667.2 363429116315901 James K. Pierce 690.4 637.7 664.0 363405116321501 James K. Pierce 705.7 648.6 677.1 363428116240301 Cooks West Well 717.2 663.1 690.2 363428116234701 Cooks East Well 718.8 668.1 693.4 363417116271801 Nye County Land Company 690.1 740.7 715.4 363411116272901 Amargosa Town Complex 688.9 647.7 668.3 363410116261101 Nye County Development Co 691.2 539.5 615.4 363410116240301 Lewis C. Cook 717.4 687.7 702.5 363410116240001 Lewis C. Cook 714.8 662.7 688.7 363407116273301 Amargosa Valley Water 701.4 646.5 673.9 Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-19 August 2000 USGS Site ID Site Name Top of Interval (m) Bottom of Interval (m) Midpoint of Interval (m) 363342116335701 Earl N. Selbach 696.5 647.7 672.1 363340116332901 Lewis N. Dansby 694.2 635.2 664.7 363342116325101 Edwin H. Mankinen 694.0 678.5 686.2 363350116252101 Willard Johns 699.5 658.4 678.9 365157116271202 USW H-1 tube 1 -480.0 -511.0 -495.5 365157116271203 USW H-1 tube 2 206.0 180.0 193.0 365157116271204 USW H-1 tube 3 587.0 538.0 562.5 365157116271205 USW H-1 tube 4 731.0 630.0 680.5 365122116275502 USW H-5 upper 775.5 632.9 704.2 365122116275503 USW H-5 lower 632.9 259.9 446.4 365108116262302 UE-25 b #1 lower 1.7 -19.3 -8.8 365108116262303 UE-25 b #1 upper 730.7 1.7 366.2 365049116285502 USW H-6 upper 776.0 549.8 662.9 365049116285505 USW H-6 lower 549.8 81.8 315.8 365032116265402 USW H-4 upper 730.4 60.5 395.5 365032116265403 USW H-4 lower 60.5 29.5 45.0 364942116280002 USW H-3 upper 731.5 422.2 576.9 364942116280003 USW H-3 lower 422.2 264.2 343.2 364938116252102 UE-25 p #1(Lwr Intrvl) -129.8 -690.8 -410.3 not available yet USW SD-7 727.6 547.7 637.7 not available yet USW SD-9 731.1 625.6 678.3 not available yet USW SD-12 730.0 663.4 696.7 not available yet NC-EWDP-1D 785.8 41.2 413.5 not available yet NC-EWDP-1S 786.7 708.9 747.8 not available yet NC-EWDP-2D 706.3 308.0 507.2 not available yet NC-EWDP-3D 717.0 36.3 376.7 not available yet NC-EWDP-3S 722.1 716.0 719.1 not available yet NC-EWDP-5S 724.1 483.6 603.9 not available yet NC-EWDP-9S 766.0 676.3 721.2 not available yet NC-Washburn-1X 714.6 622.9 668.8 364706116170601 UE-25 J -11 721.2 653.3 687.2 364237116365401 BGMW-11 715.9 631.0 673.4 363709116264601 Richard Washburn 704.1 775.7 739.9 363409116233701 L. Cook 713.3 695.0 704.1 363411116264701 Unknown 689.5 694.1 691.8 363428116281201 Amargosa Water 690.4 738.2 714.3 363429116233401 Lewis C. Cook 715.7 755.3 735.5 363511116335101 Unknown 690.8 729.4 710.1 365624116222901 USW UZ-N91 1186.8 1174.4 1180.6 Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-20 August 2000 Table I-6. Interval Description and Accuracy of Location Interval Description Where available, the interval type and description were compiled from the NWIS data files (DTN: GS991100002330.001). Accuracy of Location/Accuracy of Land-surface Altitude (meters) Location and land-surface altitude accuracy were compiled from the NWIS data files (DTN: GS991100002330.001). Sources Sources are tabulated in Table I-2 USGS Site ID Site Name Interval Description Accuracy of Location 365629116222602 UE-29 a #2 Open Hole, No Screen +/- 1 second 365520116370301 GEXA Well 4 Perforated, Porous, or Slotted Casing +/- 1 second 365340116264601 UE-25 WT #6 Wire-Wound Screen +/- 10 seconds 365322116273501 USW G-2 Open Hole, No Screen +/- 1 second 365239116253401 UE-25 WT #16 Wire-Wound Screen +/- 1 second 365208116274001 USW UZ-14 Fractured Rock Openings unknown 365207116264201 UE-25 WT #18 Wire-Wound Screen +/- 1 second 365200116272901 USW G-1 Open Hole, No Screen +/- 1 second 365147116185301 UE-25 a #3 Open Hole, No Screen +/- 1 second 365140116260301 UE-25 WT #4 Wire-Wound Screen +/- 1 second 365116116233801 UE-25 WT #15 Open Hole, No Screen +/- 1 second 365114116270401 USW G-4 Open Hole, No Screen +/- 1 second 365105116262401 UE-25 a #1 Unknown +/- 1 second 365032116243501 UE-25 WT #14 Wire-Wound Screen +/- 1 second 365023116271801 USW WT-2 Wire-Wound Screen +/- 1 second 364947116254300 UE-25 c #1 Composite interval - entire saturated section +/- 1 second 364947116254501 UE-25 c #3 Composite interval - entire saturated section +/- 1 second 364947116254401 UE-25 c #2 Upper interval - above inflatable packer +/- 1 second 364945116235001 UE-25 WT #13 Open Hole, No Screen +/- 1 second 364933116285701 USW WT- 7 Wire-Wound Screen +/- 1 second 364916116265601 USW WT- 1 Wire-Wound Screen +/- 1 second 364905116280101 USW G-3 Open Hole, No Screen +/- 1 second 364828116234001 UE-25 J -13 Open Hole, No Screen +/- 1 second 364825116290501 USW WT-10 Wire-Wound Screen +/- 1 second 364822116262601 UE-25 WT #17 Wire-Wound Screen +/- 1 second 365821116343701 USW VH-2 Fractured Rock Openings 364757116245801 UE-25 WT #3 Wire-Wound Screen +/- 1 second 364732116330701 USW VH-1 Open Hole, No Screen +/- 1 second 364656116261601 UE-25 WT #12 Wire-Wound Screen +/- 1 second 364649116280201 USW WT-11 Wire-Wound Screen +/- 1 second 364554116232400 UE-25 J -12 Perforated, Porous, or Slotted Casing 364528116232201 UE-25 JF #3 Perforated, Porous, or Slotted Casing +/- 1 second 364105116302601 Cind-R-Lite Well Perforated, Porous, or Slotted Casing +/- 1 second 363907116235701 Ben Bossingham Perforated, Porous, or Slotted Casing +/- 1 second 363836116234001 Fred Cobb Perforated, Porous, or Slotted Casing +/- 1 second 363840116235000 Bob Whellock Perforated, Porous, or Slotted Casing +/- 5 seconds 363840116234001 Louise Pereidra Perforated, Porous, or Slotted Casing +/- 1 minute Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-21 August 2000 USGS Site ID Site Name Interval Description Accuracy of Location 363840116233501 Joe Richards Perforated, Porous, or Slotted Casing +/- 1 second 363835116234001 NDOT Well Perforated, Porous, or Slotted Casing +/- 1 second 363742116263201 James H. Shaw Perforated, Porous, or Slotted Casing +/- 5 seconds 363830116241401 Airport Well Perforated, Porous, or Slotted Casing +/- 1 second 363815116175901 TW- 5 Open Hole, No Screen +/- 1 second 363711116263701 Richard Washburn Perforated, Porous, or Slotted Casing +/- 5 seconds 363621116263201 Richard Washburn Perforated, Porous, or Slotted Casing +/- 5 seconds 363549116305001 Nye County Development Co Perforated, Porous, or Slotted Casing +/- 1 second 363523116353701 Fred Wooldridge Perforated, Porous, or Slotted Casing +/- 10 seconds 363525116325601 Fred J. Keefe Perforated, Porous, or Slotted Casing +/- 5 seconds 363519116322001 Leslie Nickels Perforated, Porous, or Slotted Casing +/- 5 seconds 363540116240801 L. Mason Perforated, Porous, or Slotted Casing +/- 10 seconds 363527116292501 Unknown Unknown +/- 5 seconds 363521116352501 Davidson Well Perforated, Porous, or Slotted Casing +/- 5 seconds 363456116335501 Eugene J. Mankinen Perforated, Porous, or Slotted Casing +/- 1 minute 363454116314201 Donald O. Heath Perforated, Porous, or Slotted Casing +/- 5 seconds 363503116351501 Elvis Kelley Perforated, Porous, or Slotted Casing +/- 5 seconds 363503116284001 Manuel Rodela Perforated, Porous, or Slotted Casing +/- 5 seconds 363436116342301 Charles C. DeFir Jr. Perforated, Porous, or Slotted Casing +/- 5 seconds 363436116333201 William R. Monroe Perforated, Porous, or Slotted Casing +/- 5 seconds 363434116354001 DeFir Well Perforated, Porous, or Slotted Casing +/- 5 seconds 363438116324601 Edwin H. Mankinen Perforated, Porous, or Slotted Casing +/- 5 seconds 363442116363301 Bill Strickland Perforated, Porous, or Slotted Casing +/- 1 second 363440116282401 M. Meese Unknown +/- 1 minute 363415116275101 Theo E. Selbach Unknown +/- 10 seconds 363407116342501 C.L. Caldwell Perforated, Porous, or Slotted Casing +/- 10 seconds 363407116243501 Leonard Siegel Unknown +/- 1 minute 363429116315901 James K. Pierce Perforated, Porous, or Slotted Casing +/- 1 second 363405116321501 James K. Pierce Perforated, Porous, or Slotted Casing +/- 10 seconds 363428116240301 Cooks West Well Perforated, Porous, or Slotted Casing +/- 5 seconds 363428116234701 Cooks East Well Perforated, Porous, or Slotted Casing +/- 5 seconds 363417116271801 Nye County Land Company Unknown +/- 1 minute 363411116272901 Amargosa Town Complex Perforated, Porous, or Slotted Casing +/- 1 second 363410116261101 Nye County Development Co Perforated, Porous, or Slotted Casing +/- 5 seconds 363410116240301 Lewis C. Cook Perforated, Porous, or Slotted Casing +/- 5 seconds 363410116240001 Lewis C. Cook Perforated, Porous, or Slotted Casing +/- 5 seconds 363407116273301 Amargosa Valley Water Perforated, Porous, or Slotted Casing +/- 1 second 363342116335701 Earl N. Selbach Unknown +/- 10 seconds 363340116332901 Lewis N. Dansby Perforated, Porous, or Slotted Casing +/- 5 seconds 363342116325101 Edwin H. Mankinen Unknown +/- 10 seconds 363350116252101 Willard Johns Perforated, Porous, or Slotted Casing +/- 10 seconds 365157116271202 USW H-1 tube 1 Tube 1 - deepest interval in piezometer 365157116271203 USW H-1 tube 2 Tube 2 - second deepest interval in piezometer 365157116271204 USW H-1 tube 3 Tube 3 - second shallowest interval in piezometer 365157116271205 USW H-1 tube 4 Tube 4 - shallowest interval in piezometer +/- 1 second 365122116275502 USW H-5 upper Upper interval - above inflatable packer Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-22 August 2000 USGS Site ID Site Name Interval Description Accuracy of Location 365122116275503 USW H-5 lower Lower interval - below inflatable packer +/- 1 second 365108116262302 UE-25 b #1 lower Lower interval - below inflatable packer 365108116262303 UE-25 b #1 upper Upper interval - above inflatable packer +/- 1 second 365049116285502 USW H-6 upper Upper interval - above inflatable packer 365049116285505 USW H-6 lower Lower interval - below inflatable packer +/- 1 second 365032116265402 USW H-4 upper Upper interval - above inflatable packer 365032116265403 USW H-4 lower Lower interval - below inflatable packer +/- 1 second 364942116280002 USW H-3 upper Upper interval - above inflatable packer 364942116280003 USW H-3 lower Lower interval - below inflatable packer 364938116252102 UE-25 p #1(Lwr Intrvl) Paleozoics units monitored not available yet USW SD-7 Fractured Rock Openings unknown not available yet USW SD-9 Fractured Rock Openings unknown not available yet USW SD-12 Fractured Rock Openings unknown not available yet NC-EWDP-1D Unknown unknown not available yet NC-EWDP-1S Unknown unknown not available yet NC-EWDP-2D Unknown unknown not available yet NC-EWDP-3D Unknown unknown not available yet NC-EWDP-3S Unknown unknown not available yet NC-EWDP-5S Unknown unknown not available yet NC-EWDP-9S Unknown unknown not available yet NC-Washburn-1X Unknown unknown 364706116170601 UE-25 J -11 Open Hole, No Screen +/- 1 second 364237116365401 BGMW-11 Open Hole, No Screen +/- 1 second 363709116264601 Richard Washburn Unknown +/- 1 second 363409116233701 L. Cook Unknown +/- 1 minute 363411116264701 Unknown Unknown +/- 5 seconds 363428116281201 Amargosa Water Unknown +/- 5 seconds 363429116233401 Lewis C. Cook Unknown +/- 5 seconds 363511116335101 Unknown Unknown +/- 1 second 365624116222901 USW UZ-N91 Open Hole, No Screen Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-23 August 2000 Table I-7. Accuracy of Land-surface Altitude and Latest Water-level Measurement Method Description Accuracy of Location/Accuracy of Land-surface Altitude (meters) Location and land-surface altitude accuracy were compiled from the NWIS data files (DTN: GS991100002330.001). Latest Water-level Measurement Method Description Typical water-level measurement method was compiled from the NWIS data files (DTN: GS991100002330.001). The method used for the latest measurement prior to 1992 was used as the most typical for the period. USGS Site ID Site Name Accuracy of Landsurface Altitude (m) Latest Water-level Measurement Method Description 365629116222602 UE-29 a #2 0.1 Steel-tape measurement 365520116370301 GEXA Well 4 0.1 Electric-tape measurement 365340116264601 UE-25 WT #6 0.1 Steel-tape measurement 365322116273501 USW G-2 0.1 Electric-tape measurement 365239116253401 UE-25 WT #16 0.1 Steel-tape measurement 365208116274001 USW UZ-14 unknown unknown 365207116264201 UE-25 WT #18 0.1 Steel-tape measurement 365200116272901 USW G-1 0.1 Unknown 365147116185301 UE-25 a #3 0.1 Reported, method not known 365140116260301 UE-25 WT #4 0.1 Steel-tape measurement 365116116233801 UE-25 WT #15 0.1 Steel-tape measurement 365114116270401 USW G-4 0.1 Manometer measurement 365105116262401 UE-25 a #1 0.1 Calibrated electric-tape measurement 365032116243501 UE-25 WT #14 0.1 Steel-tape measurement 365023116271801 USW WT-2 0.1 Steel-tape measurement 364947116254300 UE-25 c #1 0.1 Analog or graphic recorder 364947116254501 UE-25 c #3 0.1 Steel-tape measurement 364947116254401 UE-25 c #2 0.1 Reported, method not known 364945116235001 UE-25 WT #13 0.1 Steel-tape measurement 364933116285701 USW WT- 7 0.1 Manometer measurement 364916116265601 USW WT- 1 0.1 Electric-tape measurement 364905116280101 USW G-3 0.1 unknown 364828116234001 UE-25 J -13 0.1 Steel-tape measurement 364825116290501 USW WT-10 0.1 Electric-tape measurement 364822116262601 UE-25 WT #17 0.1 Steel-tape measurement 365821116343701 USW VH-2 unknown unknown 364757116245801 UE-25 WT #3 0.1 Steel-tape measurement 364732116330701 USW VH-1 0.1 Steel-tape measurement 364656116261601 UE-25 WT #12 0.1 Steel-tape measurement 364649116280201 USW WT-11 0.1 Reported, method not known 364554116232400 UE-25 J -12 0.1 unknown 364528116232201 UE-25 JF #3 0.1 Unknown 364105116302601 Cind-R-Lite Well 0.1 Unknown 363907116235701 Ben Bossingham 1.0 Reported, method not known 363836116234001 Fred Cobb 0.5 Electric-tape measurement 363840116235000 Bob Whellock 3.0 Reported, method not known 363840116234001 Louise Pereidra 2.0 Reported, method not known 363840116233501 Joe Richards 0.5 Reported, method not known 363835116234001 NDOT Well 0.1 Steel-tape measurement 363742116263201 James H. Shaw 0.5 Steel-tape measurement Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-24 August 2000 USGS Site ID Site Name Accuracy of Landsurface Altitude (m) Latest Water-level Measurement Method Description 363830116241401 Airport Well 0.1 Calibrated electric-tape measurement 363815116175901 TW- 5 0.1 Electric-tape measurement 363711116263701 Richard Washburn 0.1 Steel-tape measurement 363621116263201 Richard Washburn 0.5 Reported, method not known 363549116305001 Nye County Development Co 2.0 Steel-tape measurement 363523116353701 Fred Wooldridge 0.5 unknown 363525116325601 Fred J. Keefe 0.5 Electric-tape measurement 363519116322001 Leslie Nickels 2.0 Steel-tape measurement 363540116240801 L. Mason 1.0 Unknown 363527116292501 Unknown 0.5 Electric-tape measurement 363521116352501 Davidson Well 0.5 Steel-tape measurement 363456116335501 Eugene J. Mankinen 0.5 Steel-tape measurement 363454116314201 Donald O. Heath 0.5 Steel-tape measurement 363503116351501 Elvis Kelley 0.5 Steel-tape measurement 363503116284001 Manuel Rodela 0.5 Steel-tape measurement 363436116342301 Charles C. DeFir Jr. 2.0 Electric-tape measurement 363436116333201 William R. Monroe 2.0 Steel-tape measurement 363434116354001 DeFir Well 0.1 Steel-tape measurement 363438116324601 Edwin H. Mankinen 0.5 Steel-tape measurement 363442116363301 Bill Strickland 0.5 Reported, method not known 363440116282401 M. Meese 0.1 unknown 363415116275101 Theo E. Selbach 0.5 Reported, method not known 363407116342501 C.L. Caldwell 2.0 unknown 363407116243501 Leonard Siegel 1.0 Steel-tape measurement 363429116315901 James K. Pierce 0.5 Steel-tape measurement 363405116321501 James K. Pierce 2.0 Steel-tape measurement 363428116240301 Cooks West Well 2.0 Steel-tape measurement 363428116234701 Cooks East Well 0.1 Calibrated electric-tape measurement 363417116271801 Nye County Land Company 0.1 unknown 363411116272901 Amargosa Town Complex 0.5 Reported, method not known 363410116261101 Nye County Development Co 0.5 Steel-tape measurement 363410116240301 Lewis C. Cook 0.5 Steel-tape measurement 363410116240001 Lewis C. Cook 1.0 Steel-tape measurement 363407116273301 Amargosa Valley Water 0.5 Reported, method not known 363342116335701 Earl N. Selbach 0.5 Reported, method not known 363340116332901 Lewis N. Dansby 2.0 Steel-tape measurement 363342116325101 Edwin H. Mankinen 2.0 Unknown 363350116252101 Willard Johns 0.5 Steel-tape measurement 365157116271202 USW H-1 tube 1 0.1 Steel-tape measurement 365157116271203 USW H-1 tube 2 0.1 Steel-tape measurement 365157116271204 USW H-1 tube 3 0.1 Steel-tape measurement 365157116271205 USW H-1 tube 4 0.1 Steel-tape measurement 365122116275502 USW H-5 upper 0.1 Steel-tape measurement 365122116275503 USW H-5 lower 0.1 Steel-tape measurement 365108116262302 UE-25 b #1 lower 0.1 Steel-tape measurement 365108116262303 UE-25 b #1 upper 0.1 Steel-tape measurement 365049116285502 USW H-6 upper 0.1 Steel-tape measurement 365049116285505 USW H-6 lower 0.1 unknown 365032116265402 USW H-4 upper 0.1 Unknown Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-25 August 2000 USGS Site ID Site Name Accuracy of Landsurface Altitude (m) Latest Water-level Measurement Method Description 365032116265403 USW H-4 lower 0.1 Steel-tape measurement 364942116280002 USW H-3 upper 0.1 Steel-tape measurement 364942116280003 USW H-3 lower 0.1 Calibrated electric-tape measurement 364938116252102 UE-25 p #1(Lwr Intrvl) 0.1 Steel-tape measurement not available yet USW SD-7 unknown unknown not available yet USW SD-9 unknown unknown not available yet USW SD-12 unknown unknown not available yet NC-EWDP-1D unknown unknown not available yet NC-EWDP-1S unknown unknown not available yet NC-EWDP-2D unknown unknown not available yet NC-EWDP-3D unknown unknown not available yet NC-EWDP-3S unknown unknown not available yet NC-EWDP-5S unknown unknown not available yet NC-EWDP-9S unknown unknown not available yet NC-Washburn-1X unknown unknown 364706116170601 UE-25 J -11 0.1 Calibrated electric-tape measurement 364237116365401 BGMW-11 0.5 Steel-tape measurement 363709116264601 Richard Washburn 0.5 Steel-tape measurement 363409116233701 L. Cook 0.1 Reported, method not known 363411116264701 Unknown 0.1 Steel-tape measurement 363428116281201 Amargosa Water 0.5 Steel-tape measurement 363429116233401 Lewis C. Cook 1.0 Steel-tape measurement 363511116335101 Unknown 0.5 Steel-tape measurement 365624116222901 USW UZ-N91 unknown Steel-tape measurement Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-26 August 2000 Table I-8. Water Level Measurement Accuracy and Perched? Water-level Measurement Accuracy Water-level altitude accuracy was compiled from the NWIS data files (DTN: GS991100002330.001). Perched? Potential perched-water levels identified during this analysis (O’Brien, 1998) were flagged and identified as “suspected perched.” USGS Site ID Site Name Water Level Measurement Accuracy Perched? 365629116222602 UE-29 a #2 Nearest 0.01 feet. Suspected perched 365520116370301 GEXA Well 4 Nearest 0.01 feet. 365340116264601 UE-25 WT #6 Nearest 0.01 feet. Suspected perched 365322116273501 USW G-2 unknown Suspected perched 365239116253401 UE-25 WT #16 Nearest 0.01 feet. 365208116274001 USW UZ-14 unknown 365207116264201 UE-25 WT #18 Nearest 0.01 feet. Suspected perched 365200116272901 USW G-1 unknown Suspected perched 365147116185301 UE-25 a #3 Nearest foot. Suspected perched 365140116260301 UE-25 WT #4 Nearest 0.01 feet. 365116116233801 UE-25 WT #15 Nearest 0.01 feet. 365114116270401 USW G-4 Nearest 0.01 feet. 365105116262401 UE-25 a #1 unknown 365032116243501 UE-25 WT #14 Nearest 0.01 feet. 365023116271801 USW WT-2 Nearest 0.01 feet. 364947116254300 UE-25 c #1 Nearest 0.01 feet. 364947116254501 UE-25 c #3 Nearest 0.01 feet. 364947116254401 UE-25 c #2 Nearest foot. 364945116235001 UE-25 WT #13 Nearest 0.01 feet. 364933116285701 USW WT- 7 Nearest 0.01 feet. 364916116265601 USW WT- 1 Nearest 0.1 feet. 364905116280101 USW G-3 unknown 364828116234001 UE-25 J -13 Nearest 0.01 feet. 364825116290501 USW WT-10 Nearest foot. 364822116262601 UE-25 WT #17 Nearest 0.01 feet. 365821116343701 USW VH-2 unknown 364757116245801 UE-25 WT #3 Nearest 0.01 feet. 364732116330701 USW VH-1 Nearest 0.01 feet. 364656116261601 UE-25 WT #12 Nearest 0.01 feet. 364649116280201 USW WT-11 Nearest foot. 364554116232400 UE-25 J -12 Nearest 0.01 feet. 364528116232201 UE-25 JF #3 unknown 364105116302601 Cind-R-Lite Well Nearest 0.1 feet. 363907116235701 Ben Bossingham Nearest foot. 363836116234001 Fred Cobb Nearest 0.1 feet. 363840116235000 Bob Whellock Nearest foot. 363840116234001 Louise Pereidra Nearest foot. 363840116233501 Joe Richards Nearest foot. 363835116234001 NDOT Well Nearest 0.01 feet. 363742116263201 James H. Shaw Nearest 0.01 feet. 363830116241401 Airport Well Nearest 0.01 feet. Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-27 August 2000 USGS Site ID Site Name Water Level Measurement Accuracy Perched? 363815116175901 TW- 5 Nearest 0.01 feet. 363711116263701 Richard Washburn Nearest 0.01 feet. 363621116263201 Richard Washburn Nearest foot. 363549116305001 Nye County Development Co Nearest 0.01 feet. 363523116353701 Fred Wooldridge Nearest 0.1 feet. 363525116325601 Fred J. Keefe Nearest 0.1 feet. 363519116322001 Leslie Nickels Nearest 0.01 feet. 363540116240801 L. Mason Nearest 0.01 feet. 363527116292501 Unknown Nearest 0.1 feet. 363521116352501 Davidson Well Nearest 0.01 feet. 363456116335501 Eugene J. Mankinen Nearest 0.01 feet. 363454116314201 Donald O. Heath Nearest 0.01 feet. 363503116351501 Elvis Kelley Nearest 0.01 feet. 363503116284001 Manuel Rodela Nearest 0.01 feet. 363436116342301 Charles C. DeFir Jr. Nearest 0.1 feet. 363436116333201 William R. Monroe Nearest 0.01 feet. 363434116354001 DeFir Well Nearest 0.01 feet. 363438116324601 Edwin H. Mankinen Nearest 0.01 feet. 363442116363301 Bill Strickland Nearest foot. 363440116282401 M. Meese Nearest 0.01 feet. 363415116275101 Theo E. Selbach Nearest foot. 363407116342501 C.L. Caldwell Nearest foot. 363407116243501 Leonard Siegel Nearest 0.01 feet. 363429116315901 James K. Pierce Nearest 0.01 feet. 363405116321501 James K. Pierce Nearest 0.01 feet. 363428116240301 Cooks West Well Nearest 0.01 feet. 363428116234701 Cooks East Well Nearest 0.01 feet. 363417116271801 Nye County Land Company Nearest 0.1 feet. 363411116272901 Amargosa Town Complex Nearest foot. 363410116261101 Nye County Development Co Nearest 0.01 feet. 363410116240301 Lewis C. Cook Nearest 0.01 feet. 363410116240001 Lewis C. Cook Nearest 0.01 feet. 363407116273301 Amargosa Valley Water Nearest foot. 363342116335701 Earl N. Selbach Nearest foot. 363340116332901 Lewis N. Dansby Nearest 0.01 feet. 363342116325101 Edwin H. Mankinen Nearest 0.01 feet. 363350116252101 Willard Johns Nearest 0.01 feet. 365157116271202 USW H-1 tube 1 Nearest 0.01 feet. 365157116271203 USW H-1 tube 2 Nearest 0.01 feet. 365157116271204 USW H-1 tube 3 Nearest 0.01 feet. 365157116271205 USW H-1 tube 4 Nearest 0.01 feet. 365122116275502 USW H-5 upper Nearest 0.01 feet. 365122116275503 USW H-5 lower Nearest 0.01 feet. 365108116262302 UE-25 b #1 lower Nearest 0.01 feet. 365108116262303 UE-25 b #1 upper Nearest 0.01 feet. 365049116285502 USW H-6 upper Nearest 0.01 feet. 365049116285505 USW H-6 lower unknown 365032116265402 USW H-4 upper unknown 365032116265403 USW H-4 lower Nearest 0.01 feet. Title: Water-Level Data Analysis for the Saturated Zone Site-Scale Flow and Transport Model ANL-NBS-HS-000034 REV 00 I-28 August 2000 USGS Site ID Site Name Water Level Measurement Accuracy Perched? 364942116280002 USW H-3 upper Nearest 0.01 feet. 364942116280003 USW H-3 lower unknown 364938116252102 UE-25 p #1(Lwr Intrvl) Nearest 0.01 feet. not available yet USW SD-7 unknown not available yet USW SD-9 unknown not available yet USW SD-12 unknown not available yet NC-EWDP-1D unknown not available yet NC-EWDP-1S unknown not available yet NC-EWDP-2D unknown not available yet NC-EWDP-3D unknown not available yet NC-EWDP-3S unknown not available yet NC-EWDP-5S unknown not available yet NC-EWDP-9S unknown not available yet NC-Washburn-1X unknown 364706116170601 UE-25 J -11 Nearest 0.01 feet. 364237116365401 BGMW-11 Nearest 0.01 feet. 363709116264601 Richard Washburn Nearest 0.01 feet. 363409116233701 L. Cook Nearest foot. 363411116264701 Unknown Nearest 0.01 feet. 363428116281201 Amargosa Water Nearest 0.01 feet. 363429116233401 Lewis C. Cook Nearest 0.01 feet. 363511116335101 Unknown Nearest 0.01 feet. 365624116222901 USW UZ-N91 Nearest 0.01 feet. Suspected perched