Q1. What are the contributions in "Groundwater level status report for 2010 los alamos national laboratory" ?
In this paper, the authors present the groundwater level data from the region of Los Angeles, California.
Groundwater level status report for 2008, Los Alamos National Laboratory
01 Mar 2009-
TL;DR: The status of groundwater level monitoring at Los Alamos National Laboratory in 2008 is provided in this paper, where the authors summarize the groundwater level data for 179 monitoring wells, including 45 regional aquifer wells, 28 intermediate wells, 8 regional/intermediate wells, 106 alluvial wells, and 12 water supply wells.
Abstract: The status of groundwater level monitoring at Los Alamos National Laboratory in 2008 is provided in this report. This report summarizes groundwater level data for 179 monitoring wells, including 45 regional aquifer wells, 28 intermediate wells, 8 regional/intermediate wells, 106 alluvial wells, and 12 water supply wells. Pressure transducers were installed in 166 monitoring wells for continuous monitoring of groundwater levels. Time-series hydrographs of groundwater level data are presented along with pertinent construction and location information for each well. The report also summarizes the groundwater temperatures recorded in intermediate and regional aquifer monitoring wells.
Summary (2 min read)
Jump to: [List of Tables] – [2.0 Description of Groundwater Level Data] – [3.0 Groundwater Level Data from Regional Aquifer Wells] – [3.64 Test Well 1] – [4.6 CDV-16-4ip] – [5.0 Groundwater Level Data from Alluvial Wells] and [D.5. Summary of Runoff Impacts to Intermediate Perched Groundwater]
List of Tables
- During 2010, 63 regional aquifer monitoring wells containing 106 regional aquifer screens, 30 intermediate wells and 10 intermediate/regional monitoring wells comprising 57 intermediate screens, 97 alluvial wells, and 12 Los Alamos County (LAC) water supply wells were monitored for groundwater levels.
- Ten of the multiple completion regional aquifer wells monitored one or more intermediate zones; however, at least one intermediate zone was dry in seven of these wells.
- Transducers were installed in 92 alluvial wells during 2010 and five alluvial wells were monitored with periodic manual measurements.
- This report includes groundwater level data obtained during FY 2010 (October 1, 2009, through September 30, 2010) and, where available, historical data and data obtained after September 30, 2010.
- For the alluvial wells, the first hydrograph for each well represents the entire period of record, while the second hydrograph represents the most recent two or three years of data to provide better representation of recent and seasonal changes.
2.0 Description of Groundwater Level Data
- In the following sections, acronyms used to describe groundwater level data include Previous reports of groundwater level data at LANL were compiled for the regional aquifer test wells (TWs) by Koch et al. (2004) and for all wells in a submittal to the New Mexico Environment Department in January 2005 (LANL 2005) .
- Groundwater levels in water supply wells at Los Alamos have been summarized in the series of water supply reports for Los Alamos, e.g., Koch and Rogers (2003) . (Koch and Schmeer 2010) .
3.0 Groundwater Level Data from Regional Aquifer Wells
- In the following sections reference is made to the barometric efficiency of some monitoring wells.
- Barometric efficiency is defined as the ratio of the water level change observed in a well divided by the concurrent atmospheric pressure change, expressed as a percentage.
- For a given change in atmospheric pressure, if the water in a well responds by an equal amount, the well is said to have 100% barometric efficiency; however, this type of response by the water in the well can occur only when the aquifer adjacent to the well does not experience the atmospheric pressure change.
- Thus, a well with a 100% barometric efficiency is installed into an aquifer that does not experience the atmospheric pressure fluctuations.
3.64 Test Well 1
- TW-1 was located in lower Pueblo Canyon downstream of supply well O-1. TW-1 was plugged and abandoned in March 2010, also known as Location.
- Well completed January 1950, transducer installed January 23, 1992, intermittent water level data to February 6, 2006, when the transducer was removed in preparation for well plugging and abandonment, also known as Period of Record.
- TW-1 installed in the regional aquifer at a depth of 642 ft, about 100 ft into the regional aquifer, also known as Remarks.
- The following sections include additional port and construction information for single and multiple completion intermediate wells at LANL.
4.6 CDV-16-4ip
- Soundings for water throughout 2006 and 2007 have been dry with a total depth of about 814 ft below ground surface, encountering sand at total depth.
- This total depth is above the screen; thus it appears that the well screen in the 1-in.-diameter PVC may have parted from the tubing or has been somehow damaged, potentially rendering the well inoperative.
5.0 Groundwater Level Data from Alluvial Wells
- Table 5 -1 lists the alluvial wells that were monitored for groundwater levels in 2010.
- In the following alluvial groundwater sections, the first hydrograph for each well represents the entire period of record, while the second hydrograph represents groundwater level data for recent years.
- Alluvial groundwater levels respond to snowmelt runoff, storm runoff, and, in some canyons, effluent discharges.
- Some alluvial wells have been historically dry and do not show a seasonal response to precipitation and runoff.
- The groundwater at R-12 screen 1 showed a rising trend in 2009, suggesting that the groundwater at R-12 may not be responding to the large runoff events in lower Los Alamos Canyon, or is possibly responding at a lag period greater than a few months.
D.5. Summary of Runoff Impacts to Intermediate Perched Groundwater
- Large snowmelt and storm runoff events in Los Alamos Canyon that extend eastward as far as the LANL boundary appear to infiltrate into subsurface units and impact groundwater levels in wells completed in the Cerros del Rio basalt.
- Intermediate perched groundwater in other geologic units beneath the middle part of Los Alamos Canyon and the surrounding Pajarito Plateau does not appear to be impacted by runoff events.
- Similarly, intermediate perched groundwater in some wells at TA-16 appears to respond to large snowmelt runoff events.
- With no significant runoff events in 2009, the intermediate groundwater levels in most of the TA-16 area showed a continued decline.
- Reid et al. (2008) concluded that the key feature associated with the large runoff events and response in intermediate groundwater zones was persistent runoff and brittle bedrock near the surface that provided a conduit for infiltration.
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Figures (21)
Table B-1. Mean Annual Groundwater Levels at the Top of the Regional Aquifer in 2010 
Table 3-1. Location Information for Regional Aquifer Monitoring Wells 
Figure D-6. Intermediate groundwater levels in TA-16 wells and mean daily flow at Gaging Station E252. 
Table 6-1. General Information for Los Alamos County Water Supply Wells 
Figure D-1. Intermediate groundwater levels in Cerros del Rio basalt. 
Table 4-1. General Information for Intermediate Wells at LANL 
Figure D-7. Intermediate groundwater levels in TA-16 wells and mean daily flow at Gaging Station E252. 
Figure 3-1. Regional aquifer monitoring wells and supply wells. 
Table 4-2. Well Completion Information for Intermediate Wells and Screens (Continued) 
Figure 5-1. Alluvial wells monitored for groundwater levels in 2010. 
Table C-1. Summary of Transient Responses to Supply Well Pumping in LANL Monitoring Wells (Continued) 
Figure D-3. Intermediate groundwater responses to snowmelt runoff in 2007, 2008, 2009, and 2010 in Cerros del Rio basalt and mean daily flow at Gaging Station E042. 
Figure D-2. Intermediate groundwater levels in Cerros del Rio basalt in Los Alamos and 
Table A-1. Geologic Unit Codes 
Figure 4-1. Intermediate monitoring wells. 
Table C-1. Summary of Transient Responses to Supply Well Pumping in LANL Monitoring Wells (Continued) 
Table 5-1. Information and Location Data for Alluvial Aquifer Wells at LANL 
Figure D-4. Intermediate groundwater levels at R-12 and R-23i and mean daily flow at Gaging 
Table 4-2. Well Completion Information for Intermediate Wells and Screens (Continued) 
Figure D-5. Intermediate groundwater levels in the Guaje pumice bed at LAOI(A)-1.1, LADP-3, and LAOI-3.2 and mean daily flow at Gaging Station E042. 
Table B-2. Mean Annual Groundwater Levels in Intermediate Wells in 2010
Citations
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TL;DR: This paper presents a method that utilizes a simple analytical modeling approach for analysis of a long-term water level record utilizing an inverse modeling approach and provides guidance for the development of more complicated models requiring detailed specification of the aquifer heterogeneity.
Abstract: Identification of the pumping influences at monitoring wells caused by spatially and temporally variable water supply pumping can be a challenging, yet an important hydrogeological task. The information that can be obtained can be critical for conceptualization of the hydrogeological conditions and indications of the zone of influence of the individual pumping wells. However, the pumping influences are often intermittent and small in magnitude with variable production rates from multiple pumping wells. While these difficulties may support an inclination to abandon the existing dataset and conduct a dedicated cross-hole pumping test, that option can be challenging and expensive to coordinate and execute. This paper presents a method that utilizes a simple analytical modeling approach for analysis of a long-term water level record utilizing an inverse modeling approach. The methodology allows the identification of pumping wells influencing the water level fluctuations. Thus, the analysis provides an efficient and cost-effective alternative to designed and coordinated cross-hole pumping tests. We apply this method on a dataset from the Los Alamos National Laboratory site. Our analysis also provides (1) an evaluation of the information content of the transient water level data; (2) indications of potential structures of the aquifer heterogeneity inhibiting or promoting pressure propagation; and (3) guidance for the development of more complicated models requiring detailed specification of the aquifer heterogeneity.
24 citations
09 Feb 2010
TL;DR: Harp et al. as discussed by the authors presented a compilation of five stand-alone manuscripts (Chapters 2 through 5 and Appendix A) to investigate and characterize heterogeneous aquifers.
Abstract: OF DISSERTATION Submitted in Partial Fulfillment of the Requirements for the Degree of Doctor of Philosophy Engineering The University of New Mexico Albuquerque, New Mexico December, 2009 Hydrogeological Engineering Approaches to Investigate and Characterize Heterogeneous Aquifers by Dylan Robert Harp A.A.S., Forestry Technology, Southeastern Illinois College, 1994 B.S., Civil Engineering, University of New Mexico, 2004 M.S., Civil Engineering, University of New Mexico, 2005 Ph.D., Environmental Engineering, University of New Mexico, 2009 Abstract This dissertation presents a compilation of five stand-alone manuscripts (Chapters 2 through 5 and Appendix A). Chapters 2 through 5 present hydrogeological analysis approaches, while Appendix A is utilized within the dissertation introduction as an example of a non-physically based modeling approach, albeit demonstrated on a non-hydrogeologically based application. Chapter 2 presents an inverse approach to decompose pumping influences from water-level fluctuations observed at a monitoring location. Chapter 3 presents an inferencing approach to identify effective aquifer properties at the interwell scale that can be applied to highly transient datasets. Chapter 4 introduces the use of a Markov-chain model of spatial correlation to an automated geostatistical inverse framework, demonstrating the approach on a 2D two-stratigraphic-unit synthetic aquifer. Chapter 5 utilizes the inverse frameworkThis dissertation presents a compilation of five stand-alone manuscripts (Chapters 2 through 5 and Appendix A). Chapters 2 through 5 present hydrogeological analysis approaches, while Appendix A is utilized within the dissertation introduction as an example of a non-physically based modeling approach, albeit demonstrated on a non-hydrogeologically based application. Chapter 2 presents an inverse approach to decompose pumping influences from water-level fluctuations observed at a monitoring location. Chapter 3 presents an inferencing approach to identify effective aquifer properties at the interwell scale that can be applied to highly transient datasets. Chapter 4 introduces the use of a Markov-chain model of spatial correlation to an automated geostatistical inverse framework, demonstrating the approach on a 2D two-stratigraphic-unit synthetic aquifer. Chapter 5 utilizes the inverse framework
5 citations
17 Mar 2008
TL;DR: The status of groundwater level monitoring at Los Alamos National Laboratory in Fiscal Year 2007 is provided in this paper, where pressure transducers were installed in 133 monitoring wells for continuous monitoring of groundwater levels.
Abstract: The status of groundwater level monitoring at Los Alamos National Laboratory in Fiscal Year 2007 is provided in this report. The Groundwater Level Monitoring Project was instituted in 2005 to provide a framework for the collection and processing of quality controlled groundwater level data. This report summarizes groundwater level data for 166 monitoring wells, including 45 regional aquifer wells, 25 intermediate wells, and 96 alluvial wells, and 11 water supply wells. Pressure transducers were installed in 133 monitoring wells for continuous monitoring of groundwater levels. Time-series hydrographs of groundwater level data are presented along with pertinent construction and location information for each well.
3 citations
30 Mar 2007
TL;DR: The status of groundwater level monitoring at Los Alamos National Laboratory in Fiscal Year 2006 is provided in this paper, where pressure transducers were installed in 132 monitoring wells for continuous monitoring of groundwater levels.
Abstract: The status of groundwater level monitoring at Los Alamos National Laboratory in Fiscal Year 2006 is provided in this report. The Groundwater Level Monitoring Project was instituted in 2005 for providing a framework for the collection and processing of quality controlled groundwater level data. This report summarizes groundwater level data for 158 monitoring wells, including 43 regional aquifer wells, 23 intermediate wells, and 92 alluvial wells. Pressure transducers were installed in 132 monitoring wells for continuous monitoring of groundwater levels. Time-series hydrographs of groundwater level data are presented along with pertinent construction and location information for each well.
2 citations
References
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01 Jan 1995
TL;DR: For example, hundreds of holes have been drilled into the Pajarito Plateau and surrounding test areas of the Los Alamos National Laboratory since the end of World War II to provide geologic, hydrologic, and engineering information related to development of a water supply, to provide data on the likelihood or presence of subsurface contamination from hazardous and nuclear materials.
Abstract: Hundreds of holes have been drilled into the Pajarito Plateau and surrounding test areas of the Los Alamos National Laboratory since the end of World War II. They range in depth from a few feet to more than 14,000 ft. The holes were drilled to provide geologic, hydrologic, and engineering information related to development of a water supply, to provide data on the likelihood or presence of subsurface contamination from hazardous and nuclear materials, and for engineering design for construction. The data contained in this report provide a basis for further investigations into the consequences of our past, present, and future interactions with the environment.
24 citations
TL;DR: This paper presents a method that utilizes a simple analytical modeling approach for analysis of a long-term water level record utilizing an inverse modeling approach and provides guidance for the development of more complicated models requiring detailed specification of the aquifer heterogeneity.
Abstract: Identification of the pumping influences at monitoring wells caused by spatially and temporally variable water supply pumping can be a challenging, yet an important hydrogeological task. The information that can be obtained can be critical for conceptualization of the hydrogeological conditions and indications of the zone of influence of the individual pumping wells. However, the pumping influences are often intermittent and small in magnitude with variable production rates from multiple pumping wells. While these difficulties may support an inclination to abandon the existing dataset and conduct a dedicated cross-hole pumping test, that option can be challenging and expensive to coordinate and execute. This paper presents a method that utilizes a simple analytical modeling approach for analysis of a long-term water level record utilizing an inverse modeling approach. The methodology allows the identification of pumping wells influencing the water level fluctuations. Thus, the analysis provides an efficient and cost-effective alternative to designed and coordinated cross-hole pumping tests. We apply this method on a dataset from the Los Alamos National Laboratory site. Our analysis also provides (1) an evaluation of the information content of the transient water level data; (2) indications of potential structures of the aquifer heterogeneity inhibiting or promoting pressure propagation; and (3) guidance for the development of more complicated models requiring detailed specification of the aquifer heterogeneity.
24 citations
01 Jan 1972
6 citations
01 Jul 2005
6 citations
"Groundwater level status report for..." refers methods in this paper
...Screens 2 and 3 responded to the PM-2 aquifer test in January 2003 (McLin 2005), to the PM-4 aquifer test in January 2005 (McLin 2006), and to PM-4 pumping in June 2006 and July 2007....
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01 Mar 2003
TL;DR: For the period 1998 through 2001, the total water used at Los Alamos from all sources ranged from 1325 million gallons (Mg) in 1999 to 1515 Mg in 2000 as discussed by the authors.
Abstract: For the period 1998 through 2001, the total water used at Los Alamos from all sources ranged from 1325 million gallons (Mg) in 1999 to 1515 Mg in 2000. Groundwater production ranged from 1323 Mg in 1999 to 1506 Mg in 2000 from the Guaje, Pajarito, and Otowi fields. Nonpotable surface water used from Los Alamos reservoir ranged from zero gallons in 2001 to 9.3 Mg in 2000. For years 1998 through 2001, over 99% of all water used at Los Alamos was groundwater. Water use by Los Alamos National Laboratory (LANL) between 1998 and 2001 ranged from 379 Mg in 2000 to 461 Mg in 1998. The LANL water use in 2001 was 393 Mg or 27% of the total water use at Los Alamos. Water use by Los Alamos County ranged from 872 Mg in 1999 to 1137 Mg in 2000, and averaged 1006 Mg/yr. Four new replacement wells in the Guaje field (G-2A, G-3A, G-4A, and G-5A) were drilled in 1998 and began production in 1999; with existing well G-1A, the Guaje field currently has five producing wells. Five of the old Guaje wells (G-1, G-2, G-4, G-5, and G-6) were plugged and abandoned in 1999, and one well (G-3) was abandoned but remains as an observation well for the Guaje field. The long-term water level observations in production and observation (test) wells at Los Alamos are consistent with the formation of a cone of depression in response to water production. The water level decline is gradual and at most has been about 0.7 to 2 ft per year for production wells and from 0.4 to 0.9 ft/yr for observation (test) wells. The largest water level declines have been in the Guaje field where nonpumping water levels were about 91 ft lower in 2001 than in 1951. The initial water levels of the Guaje replacement wells were 32 to 57 ft lower than the initial water levels of adjacent original Guaje wells. When production wells are taken off-line for pump replacement or repair, water levels have returned to within about 25 ft of initial static levels within 6 to 12 months. Thus, the water-level trends suggest no adverse impacts by production on long-term water supply sustainability at Los Alamos. This report summarizes production data and aquifer conditions for water production and monitor wells in the Los Alamos, New Mexico, and Los Alamos National Laboratory (LANL) area (Figure 1). Water production wells are grouped within the Guaje, Pajarito, and Otowi fields, the locations of which are shown on Figure 1. Wells from these fields supply all the potable water used for municipal and most industrial purposes in Los Alamos County (LAC), at LANL, and at Bandelier National Monument. This report has three primary objectives: (1) Provide a continuing historical record of metered well production and overall water usage; (2) Provide data to the Department of Energy (DOE) and LANL management, and Los Alamos County planners for operation of the water supply system and for long-range water resource planning; and (3) Provide water-level data from regional aquifer production wells, test wells, and monitoring wells.
5 citations
"Groundwater level status report for..." refers background in this paper
...Zone Screen Top Depth (ft) Screen Bottom Depth (ft) Screen Top Elev (ft) Screen Bottom Elev (ft) Screen Length (ft) Pump Intake Depth (ft) Pump Intake Elevation (ft) Depth to Top of Sump (ft) Top of Sump Elevation (ft) Depth to Sump Bottom (ft) Sump Length (ft) Sump Volume (L) Comment 1 6.06 11.06 6914.37 6919.37 5.00 11.06 6919.37 13.91 2.85 7.04 Alluvial groundwater Note: Ground elevation is 6930.98 ft; all measurements are from this elevation PAO-2 Construction Information 6919 6920 6921 6922 6923 6924 6925 6926 6927 11/1/98 2/24/00 6/18/01 10/11/02 2/3/04 5/28/05 9/20/06 1/13/08 G ro un dw at er E le va tio n (f t) Date PAO-2 Manual Measurement Mean Daily Transducer Measurement Bottom of Screen 6919 6920 6921 6922 6923 6924 6925 1/1/07 4/2/07 7/2/07 10/1/07 1/1/08 4/1/08 7/1/08 10/1/08 12/31/08 G ro un dw at er E le va tio n (f t) Date PAO-2 Manual Measurement Mean Daily Transducer Measurement Bottom of Screen Groundwater Level Status Report March 2009 LA-14397-PR 185 5.76 PAO-4 Location: Lower Pueblo Canyon, approximately 3100 ft southeast of the old LAC Sewage Treatment Plant location....
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...Screen Screen Top Depth (ft) Screen Bottom Depth (ft) Screen Top Elev (ft) Screen Bottom Elev (ft) Screen Length (ft) Pump Intake Depth (ft) Pump Intake Elev (ft) Depth to Top of Sump (ft) Top of Sump Elev (ft) Depth to Sump Bottom (ft) Sump Length (ft) Sump Volume (L) Hydro Zone Code Geo Unit Code 1 548.0 568.0 6187.7 6167.7 20.0 568.0 6167.7 570 2.0 0.2 I Tb4 Note: Brass Cap Elevation: 6735.70 ft; all measurements are from this elevation SCI-2 Construction Information 6200 6205 6210 6215 6220 6225 9/1/08 9/21/08 10/11/08 10/31/08 11/20/08 12/10/08 12/30/08 G ro un dw at er E le va tio n (ft ) Date SCI-2 Manual Transducer Groundwater Level Status Report March 2009 LA-14397-PR 103 4.30 Test Well 1A Location: TW-1A is located in lower Pueblo Canyon adjacent to TW-1....
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...During this period LAWS-01 screen 4 and nearby well TW-1A in lower Pueblo Canyon show similar responses, generally higher water levels in the winter and lower levels in the summer....
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...Screen Screen Top Depth (ft) Screen Bottom Depth (ft) Screen Top Elev (ft) Screen Bottom Elev (ft) Screen Length (ft) Pump Intake Depth (ft) Pump Intake Elevation (ft) Depth to Top of Sump (ft) Top of Sump Elevation (ft) Depth to Sump Bottom (ft) Sump Length (ft) Sump Volume (L) Hydro Zone Code Geo Unit Code 1 906.4 929.6 5864.0 5840.8 23.2 917.0 5853.4 929.6 5840.8 943.3 13.7 42.1 RT Tp Note: R-2 Brass Cap Ground Elevation: 6770.38 ft; all measurements are from this elevation R-2 Construction Information 5868 5869 5870 5871 5872 5873 5874 5875 5876 5877 5878 10/1/03 9/30/04 9/30/05 9/30/06 10/1/07 9/30/08 G ro un dw at er E le va tio n (ft ) Date R-2 Manual Transducer Groundwater Level Status Report March 2009 LA-14397-PR 12 3.5 R-4 Location: R-4 is located in Pueblo Canyon near the new LAC Sewage Treatment Plant....
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...Groundwater levels in water supply wells at Los Alamos have been summarized in the series of water supply reports for Los Alamos, e.g., Koch and Rogers (2003)....
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