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An Assessment of Aquifer Storage and Recovery and Mercury Methylation in the South Florida Everglades Ecosystem

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Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Dave Krabbenhoft
Publication_Date: 2007
Title:
An Assessment of Aquifer Storage and Recovery and Mercury Methylation in the South Florida Everglades Ecosystem
Geospatial_Data_Presentation_Form: report
Online_Linkage: <https://sofia.usgs.gov/projects/index.php?project_url=asr_hg>
Description:
Abstract:
The objective of this scope of work is to develop a hydrogeochemical framework of mercury and methylmercury in the hydrogeologic system in which ASR will be developed in the Upper Floridan Aquifer.
Purpose:
There are many uncertainties regarding the use of large-scale aquifer storage and recovery (ASR) technology in south Florida, including suitability of proposed ASR source waters, water quality concerns and the potential for mercury bioaccumulation (NRC 2002). The type of source waters used for aquifer recharge in south Florida includes treated drinking water, untreated ground or surface water, and reclaimed water. The source water planned for the Comprehensive Everglades Restoration Plan (CERP) ASR program is untreated or partially treated groundwater or surface water (Reese 2002).

Alternating periods of flooding and drying, called hydroperiods, vital to the historical functioning of the Everglades ecosystem, have been severely altered by human activities. Restoring these variations in water flows and levels is an integral part of the CERP. Specifically, the timing of water held and released into the ecosystem will be modified so that it more closely matches natural patterns (CERP 2002).

ASR has been proposed as a cost-effective water-supply alternative that can help meet the needs of agricultural, municipal, and recreational users and also be used for Everglades ecosystem restoration (Reese 2002). ASR is used to store excess surface water and shallow groundwater during wet periods for recovery during longer-term dry periods (NRC 2002). In an attempt to capture, store and redistribute fresh water previously lost to tides and to regulate the quality, quantity, timing and distribution of water flows, the CERP proposes the construction of over 300 ASR wells in south Florida (Reese 2002).

ASR technology has been tested and implemented in some areas of south Florida. Existing and historical ASR sites in southern Florida are mostly associated with public water utility systems located along the southeast and southwest coasts

Supplemental_Information:
For more details of sample collection and processing, see SIR 2007-5420 at <http://pubs.usgs.gov/sir/2007/5240/>
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 2003
Ending_Date: 2005
Currentness_Reference: ground condition
Status:
Progress: Complete
Maintenance_and_Update_Frequency: None planned
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -80.5
East_Bounding_Coordinate: -80
North_Bounding_Coordinate: 27.5
South_Bounding_Coordinate: -26
Keywords:
Theme:
Theme_Keyword_Thesaurus: none
Theme_Keyword: mercury
Theme_Keyword: ASR
Theme_Keyword: Aquifer Storage and Recovery
Theme_Keyword: MeHg
Theme_Keyword: methylmercury
Theme_Keyword: chemistry
Theme_Keyword: hydrology
Theme:
Theme_Keyword_Thesaurus: ISO 19115 Topic Category
Theme_Keyword: environment
Theme_Keyword: inlandWaters
Theme_Keyword: 007
Theme_Keyword: 012
Place:
Place_Keyword_Thesaurus:
Department of Commerce, 1995, Countries, Dependencies, Areas of Special Sovereignty, and Their Principal Administrative Divisions, Federal Information Processing Standard (FIPS) 10-4, Washington, DC, National Institute of Standards and Technology
Place_Keyword: United States
Place_Keyword: US
Place:
Place_Keyword_Thesaurus:
U.S. Department of Commerce, 1987, Codes for the identification of the States, the District of Columbia and the outlying areas of the United States, and associated areas (Federal Information Processing Standard 5-2): Washington, DC, NIST
Place_Keyword: Florida
Place_Keyword: FL
Place:
Place_Keyword_Thesaurus:
Department of Commerce, 1990, Counties and Equivalent Entities of the United States, Its Possessions, and Associated Areas, FIPS 6-3, Washington, DC, National Institute of Standards and Technology
Place_Keyword: Broward County
Place_Keyword: St. Lucie County
Place_Keyword: Palm Beach County
Place_Keyword: Martin County
Place:
Place_Keyword_Thesaurus: USGS Geographic Names Information System
Place_Keyword: Lake Okeechobee
Place_Keyword: Boynton Beach
Place_Keyword: North Lauderdale
Place_Keyword: Deerfield Beach
Place_Keyword: Tamarac
Place_Keyword: Ft. Lauderdale
Place_Keyword: Lauderhill
Place_Keyword: Tequesta
Place_Keyword: Boca Raton
Place_Keyword: Palm Springs
Place_Keyword: Wellington
Place_Keyword: West Palm Beach
Place_Keyword: Stuart
Place_Keyword: Sailfish Point
Place_Keyword: Fort Pierce
Place:
Place_Keyword_Thesaurus: none
Place_Keyword: Central Everglades
Place_Keyword: Greater Everglades region
Place_Keyword: Greater Lake Okeechobee
Place_Keyword: South East Coast
Stratum:
Stratum_Keyword_Thesaurus: none
Stratum_Keyword: Floridan aquifer
Access_Constraints: none
Use_Constraints: none
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: David P. Krabbenhoft
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing and physical address
Address: 8505 Research Way
City: Middleton
State_or_Province: WI
Postal_Code: 53562-3581
Country: USA
Contact_Voice_Telephone: 608 821-3843
Contact_Facsimile_Telephone: 608 821-3817
Contact_Electronic_Mail_Address: dpkrabbe@usgs.gov
Browse_Graphic:
Browse_Graphic_File_Name:
<https://sofia.usgs.gov/projects/scopesofwork03/images/asr_hgfig1x.jpg>
Browse_Graphic_File_Description:
Proposed ASR systems in the Comprehensive Everglades Restoration Plan
Browse_Graphic_File_Type: JPEG
Browse_Graphic:
Browse_Graphic_File_Name: <http://pubs.usgs.gov/sir/2007/5240/#fig1>
Browse_Graphic_File_Description:
Map showing location of the study area in southeastern Florida (modified from Reese 2002).
Browse_Graphic_File_Type: JPEG
Cross_Reference:
Citation_Information:
Originator: Ronald S. Reese
Publication_Date: 1994
Title:
Hydrogeology and the distribution and origin of salinity in the Floridan aquifer system, southeastern Florida
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: USGS Water Resources Investigations Report
Issue_Identification: 94-4010
Publication_Information:
Publication_Place: Tallahassee, FL
Publisher: U.S. Geological Survey
Other_Citation_Details: accessed as of 12/30/2009
Online_Linkage: <https://sofia.usgs.gov/publications/wri/94-4010/>
Cross_Reference:
Citation_Information:
Originator: Reese, Ronald S.
Publication_Date: 2002
Title:
Inventory and Review of Aquifer Storage and Recovery in Southern Florida
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: USGS Water-Resources Investigations Report
Issue_Identification: 02-4036
Publication_Information:
Publication_Place: Tallahassee, FL
Publisher: U.S. Geological Survey
Other_Citation_Details: accessed as of 12/30/2009
Online_Linkage: <https://sofia.usgs.gov/publications/wri/02-4036/>
Cross_Reference:
Citation_Information:
Originator:
Harvey, Judson W.

Krupa, Steven L.; Gefvert, Cynthia; Mooney, Robert H.; Choi, Jungyill; King, Susan A.; Giddings, Jefferson B.

Publication_Date: 2002
Title:
Interactions between surface water and ground water and effects on mercury transport in the north-central Everglades
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: USGS Water Resources Investigations Report
Issue_Identification: 02-4050
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Other_Citation_Details: accessed as of 12/29/2009
Online_Linkage: <https://sofia.usgs.gov/publications/wri/02-4050/>
Cross_Reference:
Citation_Information:
Originator:
Sacks, L. A.

Tihansky, A. B.

Publication_Date: 1996
Title:
Geochemical and Isotopic Composition of Ground Water, with Emphasis on Sources of Sulfate, in the Upper Floridan Aquifer and Intermediate Aquifer System in Southwest Florida
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: USGS Water-Resources Investigations Report
Issue_Identification: 96-4146
Publication_Information:
Publication_Place: Tallahassee, FL
Publisher: U.S. Geological Survey
Other_Citation_Details: accessed as of 12/30/2009
Online_Linkage: <http://fl.water.usgs.gov/Abstracts/wri96_4146_sacks.html>
Cross_Reference:
Citation_Information:
Originator:
Benoit, J. M.

Gilmour, C. C.; Mason, R. P.; Heyes, A.

Publication_Date: 1999
Title:
Sulfide Controls on Mercury Speciation and Bioavailability to Methylating Bacteria in Sediment Pore Waters
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: Environmental Science and Technology
Issue_Identification: v. 33, n. 6, p. 951-957
Publication_Information:
Publication_Place: Washington, DC
Publisher: American Chemical Society
Other_Citation_Details:
accessed as of 12/29/2009

The full article is available via journal subscription or single article purchase. The abstract may be viewed online

Online_Linkage: <http://pubs.acs.org/doi/abs/10.1021/es9808200>
Cross_Reference:
Citation_Information:
Originator:
U.S. Army Corps of Engineers

South Florida Water Management District

Publication_Date: 2002
Title: Comprehensive Everglades Restoration Plan (CERP)
Geospatial_Data_Presentation_Form: report
Publication_Information:
Publication_Place: Jacksonville, Fl
Publisher: U.S. Army Corps of Engineers
Other_Citation_Details: accessed as of 12/29/2009
Online_Linkage: <http://www.evergladesplan.org/pub/restudy_eis.aspx#mainreport>
Cross_Reference:
Citation_Information:
Originator:
Gilmour, C. C.

Henry, E. A.; Mitchell, R.

Publication_Date: 1992
Title:
Sulfate Stimulation of Mercury Methylation in Freshwater Sediments
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: Environmental Science and Technology
Issue_Identification: v. 26, n. 11, p. 2281-22887
Publication_Information:
Publication_Place: Washington, DC
Publisher: American Chemical Society
Other_Citation_Details:
accessed as of 12/29/2009

The first page of the report is available online in lieu of an abstract. The full article is available via journal subscription or single article purchase.

Online_Linkage: <http://pubs.acs.org/doi/abs/10.1021/es00035a029>
Cross_Reference:
Citation_Information:
Originator:
Horvat, M.

Bloom, N. S.; Liang, L.

Publication_Date: 199309
Title:
Comparison of distillation with other current isolation methods for the determination of methyl mercury compounds in low level environmental samples: Part 1. Sediments
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: Analytica Chimica Acta
Issue_Identification: v. 281, n. 1, p. 135-152
Publication_Information:
Publication_Place: Amsterdam, The Netherlands
Publisher: Elsevier Science B. V.
Other_Citation_Details:
accessed as of 12/29/2009

The full article is available via journal subscription or single article purchase. The abstract may be viewed on the Science Direct website by selecting the volume and issue number.

Online_Linkage: <http://www.sciencedirect.com/science/journal/00032670>
Cross_Reference:
Citation_Information:
Originator:
Krabbenhoft, D. P.

Babiarz, C. L.

Publication_Date: 1992
Title: The Role of Groundwater Transport in Aquatic Mercury Cycling
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: Water Resources Research
Issue_Identification: v. 28, n. 12, 3119-3128
Publication_Information:
Publication_Place: Washington, DC
Publisher: American Geophysical Union
Other_Citation_Details:
accessed as of 1/05/2010

The full article is available via journal subscription or single article purchase. The abstract may be viewed online

Online_Linkage: <http://www.agu.org/journals/ABS/1992/92WR01766.shtml>
Cross_Reference:
Citation_Information:
Originator:
Krabbenhoft, D. P.

Gilmour, C. C.; Benoit, J. M.; Babiarz, C. L.; Andren, A. W.; Hurley, J. P.

Publication_Date: 1998
Title:
Methyl mercury dynamics in littoral sediments of a temperate seepage lake
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: Canadian Journal of Fisheries and Aquatic Sciences
Issue_Identification: v. 55, n. 4, p. 835-844
Publication_Information:
Publication_Place: Canada
Publisher: National Resource Council Canada
Other_Citation_Details:
accessed as of 12/29/2009

The full article is available via journal subscription or single article purchase. The abstract may be viewed on the National Research Council Canada website

Online_Linkage:
<http://rparticle.web-p.cisti.nrc.ca/rparticle/AbstractTemplateServlet?calyLang=eng&journal=cjfas&volume=55&year=0&issue=4&msno=f97-304>
Cross_Reference:
Citation_Information:
Originator:
Mason, R. P.

Lawson, N. M.; Lawrence, A. L.; Leaner, J. J.; Lee, J. G.; Sheu, G-R

Publication_Date: 1999
Title: Mercury in the Chesapeake Bay
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: Marine Chemistry
Issue_Identification: v. 65, issues 1-2, p. 77-96
Publication_Information:
Publication_Place: Amsterdam, The Netherlands
Publisher: Elsevier Science B. V.
Other_Citation_Details:
accessed as of 12/29/2009

The full article is available via journal subscription or single article purchase. The abstract may be viewed on the Marine Chemistry website by selecting the volume and issue number.

Online_Linkage: <http://www.sciencedirect.com/science/journal/03044203>
Cross_Reference:
Citation_Information:
Originator:
Metz, P. A.

Brendle, D. L.

Publication_Date: 1996
Title:
Potential for Water-Quality Degradation of Interconnected Aquifers in West-Central Florida
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: USGS Water Resources Investigations Report
Issue_Identification: 96-4030
Publication_Information:
Publication_Place: Tallahassee, FL
Publisher: U.S. Geological Survey
Other_Citation_Details:
accessed as of 12/30/2009

Prepared in cooperation with the Southwest Florida Water Management District

Online_Linkage: <http://fl.water.usgs.gov/Abstracts/wri96_4030_metz.html>
Cross_Reference:
Citation_Information:
Originator:
Ullrich, S. M.

Tanton, T. W.; Abdrashitova, S. A.

Publication_Date: 2001
Title:
Mercury in the Aquatic Environment: A Review of Factors Affecting Methylation
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: Critical Reviews in Environmental Science and Technology
Issue_Identification: v. 31, n. 3, p. 241-293
Publication_Information:
Publication_Place: Philadelphia, PA
Publisher: Taylor & Francis
Other_Citation_Details:
accesssed as of 12/30/2009

The full article is available via journal subscription or single article purchase. The abstract may be viewed on the website below.

Online_Linkage:
<http://www.informaworld.com/smpp/content~db=all~content=a727072783>
Cross_Reference:
Citation_Information:
Originator:
Wiener, J. G.

Krabbenhoft, D. P.; Heinz, G. H.; Scheuhammer, A. M.

Publication_Date: 2002
Title: Ecotoxicology of Mercury
Geospatial_Data_Presentation_Form: book chapter
Publication_Information:
Publication_Place: Boca Raton, FL
Publisher: CRC Press
Other_Citation_Details:
Pages 407-461 in Book of Ecotoxicology, 2nd ed.; Hoffman, D. J.; Rattner, B. A.; Burton, Jr., G. A.; Cairns, J., editors
Cross_Reference:
Citation_Information:
Originator:
Fadini. P. S.

Jardim, W. F.

Publication_Date: 200107
Title:
Is the Negro River Basin (Amazon) impacted by naturally occurring mercury?
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: The Science of the Total Environment
Issue_Identification: v. 275, p. 71-82
Publication_Information:
Publication_Place: Amsterdam, The Netherlands
Publisher: Elsevier Science B. V
Other_Citation_Details:
accessed as of 1/4/2010

The full article is available via journal subscription or single article purchase. The abstract may be viewed on the Science Direct website by selecting the volume and issue number.

Online_Linkage: <http://www.sciencedirect.com/science/journal/00489697>
Cross_Reference:
Citation_Information:
Originator:
Krabbenhoft, D. P.

Aiken, G. R.; Anderson, M. P.

Publication_Date: 2007
Title:
An Assessment of the Potential Effects of Aquifer Storage and Recovery on Mercury Cycling in South Florida
Geospatial_Data_Presentation_Form: report
Series_Information:
Series_Name: USGS Scientific Investigations Report (SIR)
Issue_Identification: 2007-5420
Publication_Information:
Publication_Place: Reston, VA
Publisher: U.S. Geological Survey
Other_Citation_Details:
accessed as of 1/4/2010

Prepared in cooperation with the U. S. Army Corps of Engineers, Jacksonville, FL

Online_Linkage: <http://pubs.usgs.gov/sir/2007/5240/>

Data_Quality_Information:
Logical_Consistency_Report:
Sampling wells will be selected to obtain a representative distribution of sampling points.
Completeness_Report:
Permission to sample the wells will be obtained from representatives of municipalities, private owners, existing ASR well project sites, and pilot ASR sites. ASR wells 20 (LO), 27 (SL), and those found in Palm Beach and Broward Counties will be targeted, as well as USGS monitoring wells located in Glades, Hendry, Palm Beach, and Broward Counties. Although the wells listed above are targeted for sampling, final determination of the sampling network will depend upon obtaining permission to sample the wells.
Lineage:
Process_Step:
Process_Description:
Task 1 - Conceptual Mercury Model

A conceptual model of mercury within the Floridan Aquifer System (FAS) in south Florida will be developed by assembling information from reports in the literature and other available data. The conceptual model will include background chemistry of aquifer materials, groundwater, and surface water and will attempt to put mercury, ASR, and the hydrogeology of south Florida in a consistent framework.

Task 2A and 2B - Field Collection of Water Samples and Laboratory Analyses

While in the field, water samples will be analyzed with a portable field probe for dissolved oxygen (DO), pH, redox, temperature, specific conductance, and dissolved organic carbon (DOC). Water samples will be analyzed for major cations and anions as well. Also, a series of water samples will be collected for mercury analysis using trace metal ultraclean techniques as outlined by Krabbenhoft and Babiarz (1992), to eliminate direct contact between the sample gear and field personnel. These water samples will be analyzed by the USGS Mercury Research Lab (Wisconsin District Mercury Laboratory) for mercury using method 1631, the analytical method approved by the USEPA that allows determination of mercury at a minimum level of 0.4 ppt (parts-per-trillion), and supports measurements at the ambient water quality criteria for mercury published in the National Toxics Rule (40 CFR 131.36) and in the Final Water Quality Guidance for the Great Lakes System (60 FR 15366). Methylmercury will be determined using the distillation and ethylation procedure first described by Horvat et al. (1993), and is used the standard operating procedure by the USGS Mercury Lab.

The only known true groundwater samples that have been analyzed for total mercury and methylmercury in south Florida were those reported by Harvey et al. (2002). Samples acquired for that data set were taken from piezometers screened in the surficial aquifer, above the Hawthorn and Floridian Aquifers. Nevertheless, in that sample set of 50 groundwater samples, about 10 percent of the samples contained high levels of MeHg (1-8 ng/L), and thus underscoring the reason for possible concern for large-scale implementation of ASR. However, not enough information was available to infer whether the MeHg present in these samples was produced with in the shallow aquifers, or if the MeHg was possible contained in surface waters that recharged the aquifer.

Task 2C - Obtaining Aquifer Cores Samples

Selection and acquisition of core materials will be coordinated with the USACE technical lead overseeing the drilling and other associated project tasks. To be most effective, core materials needed for this component of the project would be derived from portions of the FAS that will be used in the operational phase of the ASR project. Samples that represent a range of aquifer material types (texture, mineralogy and chemistry) would provide the best testing materials for this work. Although intact cores from pilot wells would be ideal for these tests, cuttings would also be usable for these evaluations. Core samples must be received by August 2003 for the tests for up to 6 months before taking final samples.

Task 3 - Water-Rock Incubation Studies

Although incubation tests used to assess methylmercury formation rates have been used by mercury researchers for over a decade (Krabbenhoft et al., 1998), there are no known published reports on studies using carbonate aquifer materials, or studies that target the evaluation of methylation potential and methylation rates at time scales of weeks to months. As such, we will adopt the best approach for conducting the methylation studies after we complete the synoptic field sampling and have had opportunity to evaluate what types of materials may be available for testing, what procedure would be most appropriate and feasible, and over what time scales. In essence, however, one of the following methods will be used: column studies using intact Floridian Aquifer cores; column studies of unconsolidated Floridian Aquifer materials; or, batch studies using unconsolidated Floridian Aquifer materials. With any of these procedures, we will employ geochemical controls (redox, chloride, sulfate, DOC, and mercury isotopes) to test whether these constituents affect aqueous MeHg formation rates. Representative water types and sources will also be used in these studies, such that the mixing of native surface water and groundwater will be evaluated under varying redox regimes. A series of six (6) to ten (10) column studies will be set up in the laboratory using Floridan Aquifer materials and native surface water and groundwater. The experiments conducted for this portion of the study will be conducted for time periods up to six months.

Task 4 - Leaching of Aquifer Materials

Leaching experiments will be performed to determine whether aquifer materials are acting as net sources or sinks of mercury within the aquifer. If mercury is found to be associated with specific minerals and/or geologic units, efforts will be made to perform experiments using samples characteristic of each type of mercury occurrence. The design of the leaching experiments and the selection of leaching solutions will focus on specific processes likely to occur. Details of the experiments will be developed after analyzing the information gained from the groundwater chemistry and mineralogy data to be assembled and collected in phases 1 and 2 of this project. The experiments will be designed to simulate conditions in the field as much as possible. If the results of the groundwater chemistry sampling indicate that variations in pH and /or redox conditions are important controls on mercury mobility, the pH and dissolved oxygen content of the leaching solutions will be varied accordingly. Although microbial processes affect mercury mobility, they will not be addressed in this project. To insure the processes observed in the leaching experiments are solely abiotic, the experiments will be performed under sterile conditions.

Our leaching experiments will be conducted in a fashion similar to that of Fadini and Jardim (2001), who outlined a method for leaching mercury from soils. Different samples of aquifer materials are suspended in MilliQ® water to simulate a possible phase transfer between soil and water due to weathering processes (although we will likely use native surface and ground water). Aliquots of soil 0.4 g dry base are then suspended in 100 ml of MilliQ® water in Erlenmeyer flasks with Teflon® stoppers and placed in an orbital shaker at 120 strokes min-1 for 2 hours. After 7 days of quiescent equilibrium, 30 ml aliquots are removed from each flask and centrifuged. Total mercury concentration in the supernatant solution is determined in the sub-samples by detection using USEPA method 1631, and methylmercury by the procedure of Horvat et al. (1993) at the USGS Mercury Research Lab. In addtion, our leaching experiments will employ the use of stable mercury isotopes (e.g., Me199Hg or 202Hg) to specifically determine whether Hg or MeHg contained in surface water may adsorb to the aquifer material, methylate during contact with the aquifer materials, chemically reduce to gaseous elemental Hg0, or possibly undergo demethylation. The use of stable isotopes facilitates the discrimination of Hg and MeHg in injected surface water from Hg and MeHg possibly contained in carbonate aquifer or native groundwater. The mercury stable isotope analyses for total and methylmercury will be performed at the USGS Mercury Research Lab.

Task 5 - Geochemical Modeling

The geochemical environment that ASR waters will be expected to change radically from surface water conditions to groundwater conditions, and then back to surface water upon recovery. As indicated above, groundwater in the Floridian Aquifer is relatively high in chloride, which should have a strong effect on mercury speciation. However, other competing ligands may also be present (e.g., DOC, sulfide, hydroxide) at sufficiently high levels to "out compete" for the mercury, and/or possibly promote or retard mercury bioavailability for methylation. Recent research (e.g., Benoit et al., 1999) has suggested that the formation of zero charged complexes (HgCl2, HgS, Hg(OH)2) in the aqueous environment are the bioavailable species of mercury to methylating microbes, as opposed to charged species (e.g., HgCl3-, HgS2=). For this project, we will incorporate the analytical results of the primary ligands for mercury (Cl, S, OH, DOC) and perform chemical speciation calculations using standard geochemical models (e.g., MINEQL) to estimate the geochemical speciation of mercury in aqueous samples for source waters, "injected" groundwater, and recovered water.

Task 6 - Report Preparation and Oral Presentation of Results

Throughout the project, the USGS will provide quarterly status reports to the USACE project manager and technical manager. The quarterly status reports are a brief summary of the tasks completed during the quarter and status of the ongoing effort. These reports should describe any issues or concerns that may impact completion of tasks. Generally, the quarterly report is no more than one page. The final report, a citable USGS Water-Resources Investigations Report, will be a web-distributed report and will document the project results and methods used. The final report will provide guidance on how ASR can best be implemented to minimize the potential for MeHG formation.

In September 2004, most of the analyses and interpretations will be completed. The project staff will present the results to date to the ASR Regional Study project delivery team (PDT) in September or October. Following that presentation, the final report will be completed, reviewed, and approved for USGS publication by March 2005

Any use of trade, product, or firm names is for descriptive purposes only and does not constitute endorsement by the U.S. Government

Process_Date: 2005
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: David P. Krabbenhoft
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing and physical address
Address: 8505 Research Way
City: Middleton
State_or_Province: WI
Postal_Code: 53562-3581
Country: USA
Contact_Voice_Telephone: 608 821-3843
Contact_Facsimile_Telephone: 608 821-3817
Contact_Electronic_Mail_Address: dpkrabbe@usgs.gov

Spatial_Data_Organization_Information:
Indirect_Spatial_Reference: South Florida Everglades
Direct_Spatial_Reference_Method: Point
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 24

Entity_and_Attribute_Information:
Overview_Description:
Entity_and_Attribute_Overview:
Data from specific chemical analyses from municipal wells include: water utility name; aquifer; utility well id; pH; conductivity (microMohs per centimeter); alkalinity (milligram per liter - mg/L); HgT (total mercury in nanogram per liter - ng/L) MeHg (methylmercury ng/L); MeHg/HgT ratio (ratio of methylmercury to total mercury); TOC (total organic carbon mg/L). ND = no data, sample not collected.

Results of specific chemical analyses of major cations and anions from municipal wells include: calcium (mg/L); magnesium (mg/L); sodium (mg/L); potassium (mg/L); sulfate (mg/L); and chloride (mg/L).

Results of specific chemical analyses of samples collected from laboratory incubation experiments include: sample/experiment id; sample date; ambient MeHg (ng/L); Me199Hg (ng/L); Me201Hg (ng/L); ambient Hg (ng/L); 199Hg (ng/L); 201Hg (ng/L); sulfate (mg/L); DOC (mg/L C - DOC expressed as milligrams per liter of carbon); and SUVA (specific ultraviolet absorbance)

Entity_and_Attribute_Detail_Citation: USGS personnel

Metadata_Reference_Information:
Metadata_Date: 20100324
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Heather Henkel
Contact_Organization: U.S. Geological Survey
Contact_Address:
Address_Type: mailing and physical address
Address: 600 Fourth Street South
City: St. Petersburg
State_or_Province: FL
Postal_Code: 33701
Country: USA
Contact_Voice_Telephone: 727 803-8747 ext 3028
Contact_Facsimile_Telephone: 727 803-2030
Contact_Electronic_Mail_Address: sofia-metadata@usgs.gov
Metadata_Standard_Name: Content Standard for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Access_Constraints: none
Metadata_Use_Constraints:
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This page is <https://sofia.usgs.gov/metadata/sflwww/asr_hg.html>

U.S. Department of the Interior, U.S. Geological Survey
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Generated by mp version 2.8.18 on Wed Mar 24 10:27:55 2010