Elizabeth River Long Term Monitoring

Metadata:

Identification_Information
Data_Quality_Information
Spatial_Data_Organization_Information
Spatial_Reference_Information
Entity_and_Attribute_Information
Distribution_Information
Metadata_Reference_Information

Identification_Information: top

Citation:

Citation_Information:

Originator: Old Dominion University

Originator: Water Quality Laboratory

Publication_Date: 20090223

Title: Elizabeth River Long Term Monitoring

Geospatial_Data_Presentation_Form: spatial database

Online_Linkage: <http://www.chesapeakebay.net>

Description:

Abstract:

Virginia presently has 5 stations in the Elizabeth River sampled monthly throughout the year for water quality monitoring. The program was established as a long-term program of data collection and analysis to characterize the River's quality so as to determine the effectiveness of management actions and to allow trend assessment of water quality and living resources. The Elizabeth River is ecologically important to the living resources and water quality of the lower Chesapeake Bay, due to the River's drainage into the Bay. By sampling the River it allows a more complete picture of nutrient dynamics in the lower Chesapeake Bay. Stations were located in the in the mainstem, Eastern, Western and Southern Branches of the Elizabeth River.

The program began in February, 1989. For 1989 through July, 1990, Old Dominion University (ODU) collected 6 Elizabeth River stations. The station ID's were: ELI2, EBE1, WBE1, LAF1, SBE2 and SBE5. In August, 1990 station LAF1 was dropped from the Elizabeth River Long Term Monitoring (ERLTM) Program. In January, 1998 the Virginia Department of Environmental Quality (VaDEQ) Tidewater Regional Office (TRO) funded two new stations to be part of the monthly ERLTM program. These station ID's are SBA1 And SBD4. In October, 1998 VaDEQ-TRO funded two more additional stations, with the station ID's SBD1 and SBC1. Starting in July, 2000 the funding for the stations SBA1, SBD4, SBD1 and SBC1 has been added as part of the Chesapeake Bay Long Term Monitoring Program and is no longer a separately funded project. However, the money for these stations is still supplied by the state of Virginia. In September 2001 the EBE1 station had to be located approximately 70 yards east of its original location due to increased Navy security. This station will be called EBE1-E when it is sampled at this location. On December 2001 the Navy ship at Metro Machine was no longer there, and the station EBE1 was sampled back at its original location. In November 2002 four stations were discontinued due to funding constraints in the state of Virginia. These were SBA1, SBD4, SBD1 and SBC1. On November 12, 2008 a liquid nitrogen storage tank on land on the Southern Branch of the Elizabeth River broke open and spilled its contents. Approximately 200,000 gallons were not contained. For the Elizabeth River samples collected on December 2, 2008 nitrite (NO2F) was analyzed in addition to the regular nutrient parameters routinely analyzed.

The sampling frequency has changed over time, and some stations have been deleted or added as noted above. Parameters sampled through the course of the monitoring program include: temperature (WTEMP), dissolved oxygen (DO), specific conductivity (SPCOND), salinity (SALINITY), ph (PH), secchi depth (SECCHI), chlorophyll a (CHLA), pheophytin (PHEO), filtered silica(SIF), total suspended solids (TSS), total phosphorus (TP), total dissolved phosphorus (TDP), particulate phosphorus (PP), orthophosphate filtered (PO4F), total dissolved nitrogen (TDN), nitrite plus nitrate filtered (NO23F), nitrite filtered (NO2F), nitrate filtered (NO3F), ammonium filtered (NH4F), particulate nitrogen (PN), particulate carbon (PC), colored dissolved organic matter (CDOM), dissolved organic carbon (DOC). Some parameters have been dropped or replaced over time.

See the station listing at www.chesapeakebay.net/data/index.htm

Purpose:

This database was created to store grant deliverable data collected as part of the Elizabeth River Long Term Monitoring Program water quality monitoring program. These data are used to guide environmental decisions and to monitor responses of the Elizabeth River and Chesapeake Bay system to management actions.

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19890227

Ending_Date: 20081231

Currentness_Reference: Ground Condition

Status:

Progress: In work

Maintenance_and_Update_Frequency: As needed

Spatial_Domain:

Bounding_Coordinates:

West_Bounding_Coordinate: -80.53758

East_Bounding_Coordinate: -074.5759

North_Bounding_Coordinate: +42.979

South_Bounding_Coordinate: +36.66154

Keywords:

Theme:

Theme_Keyword_Thesaurus: CIMS Subject Keyword List

Place:

Place_Keyword_Thesaurus: User Defined Keyword List

Place_Keyword: Elizabeth River

Place_Keyword: Monitoring Segment

Place_Keyword: Virginia

Access_Constraints: None

Use_Constraints: None

Data_Quality_Information: top

Attribute_Accuracy:

Attribute_Accuracy_Report:

All data generated by the laboratory is subjected to QA/QC protocol and peer review. Instrument maintenance is performed and recorded in instrument manuals.

Quality assurance data for chemical analyses measure two quantities, precision and accuracy. Precision is the repeatability of measurements, and accuracy is the closeness of analytical measurement to a ''true'' value. Elizabeth River QA data include precision and accuracy comparisons within the same organization, and among results from different organizations.

Within-organization QA data:

Samples are spiked and replicated at a frequency of at least 10%. The spike recoveries must be within 80-120%, and the replicates must be <= 20% CV. Calibration curves are analyzed and the r>= 0.9980. Calibration standards are analyzed every 10 samples to ensure analysis is in calibration. SRMs are analyzed for parameters they are commercially available for. For the following analysis SRMs are analyzed with each calibration curve: NO23F, NH4F, TDN, TDP, PP, PO4F, PC and PN. The YSI 6600 sonde used to collect physiochemical parameters DEPTH, COND, SALINITY, PH, WTEMP, and DO is calibrated before every sampling event and post-calibrated after each sampling event. The spectrophotometer used for CHLA/PHEO analysis is checked monthly with NIST standards. The balances used in the laboratory are checked monthly with Class 1 standard weights. Laboratory replicate and spike data are submitted to CBP separately for the Elizabeth River. These data are maintained as separate data sets and are not included within the water quality database. At some stations, field splits are also generated, and these are reported and included within the water quality database.

Field QA Data:

Field precision is estimated with field splits.

Field replicates:

Starting in May 2008, Old Dominion University will collect one field split at a random station and depth and include this as an individual observation in both its monitoring and QA data submissions. SAMPLE_ID for this monitoring data will have a value of ''FS1'' or ''FS2''.

Inter-organization QA data:

The Coordinated Split Sample Program (CSSP) was organized to include all the laboratories in the CBP. Mainstem laboratories have analyzed split samples quarterly since June 1988, sending mainstem samples to the three mainstem laboratories, Chesapeake Biological Laboratory (CBL), VIMS, and ODU, as well as the two main tributary laboratories, Maryland Dept of Health and Mental Hygiene, (DHMH), and Virginia Division of Consolidated Laboratory Services (DCLS). Over time the CSSP has grown to include three components (mainstem, tributary, and fall line) each including three to five labs that analyze samples from similar salinity regimes and concentration ranges. ODU participates in the mainstem and tributary CSSP. For the tributary component labs analyze triplicate field samples that are collected quarterly. For the mainstem component the sample design was indentical to the tributary componenet until 1999. Starting in 1999 labs anlayze quadruplicate field samples that are collected quarterly. Two of the samples are analyzed for each parameter, and the other two samples are analyzed on a seperate analysis day for each parameter. The data are analyzed at the CBP and reported to the Analytical Methods and Quality Assurance Workgroup (AMQAW). The goal is to identify parameters that have low inter-laboratory agreement, estimate the measurement system variability, and then take action to increase the level of agreement. These data are not included in the water quality database. Refer to AMQAW, ''Chesapeake Bay Program Coordinated Split Sample Program Report 1994-1998'' at website www.chesapeakbay.net/pubs/1000.pdf.

Another aspect of quality assurance is detection limits. The minimum detection limit (MDL) is the lowest concentration of a parameter that the measurement system can detect reliably. At participating laboratories, the MDL is currently determined from three times the standard deviation of seven replicates of a low-level ambient water sample. In the Chesapeake Bay Program (CBP) database, when measurements are below the MDL, the value of the parameter is set to the detection limit and the associated detection limit field, QUALIFIER, is set to ''<''. Detection limits for many parameters have been lowered over the life of the program. These detection limits are submitted by ODU to the CBP database on a yearly basis.

Logical_Consistency_Report: None.

Completeness_Report:

When the monitoring program began in February, 1989, there were 12 cruises scheduled for the Elizabeth River, one in each month of the year. This monitoring schedule has remained the same to present.

In addition, some stations may not be sampled at times depending on weather or other anomolies. This information is documented in the WQ_CRUISE table COMMENTS field.

For the period February, 1989 through August, 1998 data from the monitoring program were stored in SAS data sets at the CBP computer center. When the ACCESS format came into use as the submittal format, information normally contained in the data set documentation file was stored within the data tables or in COMMENTS fields. As time permits the cruise, station, and parameter documentation for the old data will be moved to the appropriate ACCESS tables. Refer to AMQAW, ''Guide to Using Chesapeake Bay Program Water Quality Monitoring Data'', www.chesapeakebay.net/data/index.htm

Values that are missing have a code in the PROBLEM column in tables that it is available. If there is not a PROBLEM code in the table it is listed in the COMMENT section of the table.

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report: A GPS using NAD83 is used on the boat to find station location.

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report: A GPS using NAD83 is used on the boat to find station location.

Lineage:

Process_Step:

Process_Description:

Samples are collected on 5 fixed stations 12 times a year. Presently, for the NO23F, NH4F, PO4F, TDN, TDP and PP analysis, a Skalar contiuous flow analyzer is used. For PC/PN analysis a CE Instruments Flash EA 1112 Elemental analyzer is used. For DOC a Shimadzu® Total Organic Carbon Analyzer Model TOC-5000 is used. For field parameters SPCOND, SALINITY,DO, PH, WTEMP, and DEPTH, a YSI 6600 V2 with an optical DO probe is used. For CHLA and PHEO a Shimadzu UV-2401 PC dual beam spectrophotometer is used. For CDOM a Shimadzu UV-2401 PC dual beam UV/VIS Recording spectrophotometer is used. In WQ_DATA table, all data with SAMPLE_TYPE D is downloaded directly from instruments and entered into the database, except CHLA, PHEO, TSS and FSS which are calculated in ACCESS. The raw OD values for CHLA and PHEO and the weights for TSS and FSS are downloaded directly from the instruments into an Access database. For this data the volume filtered, the volume extracted (for CHLA and PHEO) and the light path (for CHLA and PHEO) are hand entered and visually inspected. For the WQ_DATA table the SECCHI data are double entered and compared in Access. For the WQ_DATA table all data with SAMPLE_TYPE ISM, except the SECCHI data, are downloaded directly from the YSI data logger and imported into the Access database. If a depth is not saved in the YSI data logger file the data is hand entered and visually inspected, and a note is placed in the comment section of the WQ_DATA table. For the WQ_EVENT table all data are double entered and compared in Access. For the WQ_KD table the instrument values are downloaded and imported into the Access database, and the station and depths are hand entered and visually inspected.

The methods are found in the METHOD column, which corresponds to a method code. The methods used by this laboratory through the years are as follows:

PARAMETER NAME: CHLA, chlorophyll a, monochromatic, spectrophotometric

CBP METHOD: L01

EPA METHOD OR OTHER DESCRIPTION: APHA - 1002G.

REFERENCE: APHA, 1985. Standard Methods, 16th edition, Method 1002G.

Perkin Elmer dual beam spectrophotometer used until December 1997. January, 1998-December 2005 a Unicam UV1 dual beam spectrophotometer is used. January 2006-present a Shimadzu 2401PC dual beam spectrophotometer is used.

PARAMETER NAME: CDOM_440 and CDOM_SLOPE, colored dissolved organic matter, spectrophotometric

CBP METHOD: L01

EPA METHOD OR OTHER DESCRIPTION:

REFERENCE: Mitchell B.G., Bricaud A., Carder K., Cleveland J., et al., 2000, Determination of spectral absorption coefficients of particles, dissolved material and phytoplankton for discrete water samples, [in:] Ocean Optics Protocols for Satellite Ocean Color Sensor Validation. Revision 2, G. S. Fargion & J.L.Mueller (eds.), NASA/TM2000209966, Greenbelt, Maryland, Goddard Space Flight Centre, 125153.

Analysis conducted in July 2005-October 2005 and April 2006-June 2006 using a Shimadzu UV-2401 PC dual beam UV/VIS Recording spectrophotometer. The data was calculated using an Excel® spreadsheet developed by the Smithsonian Environmental Research Center, and is reported using the parameter names CDOM_440 and CDOM_SLOPE.

PARAMETER NAME: SPCOND, conductivity, in-situ specific conductance at 25 C

CBP METHOD: F01

EPA METHOD OR OTHER DESCRIPTION: A calibrated conductivity sensor attached to a multi-probe sonde is lowered into a water body and allowed to stabilize prior to taking the meter reading.

REFERENCE:

ODU used an RS-5 salinometer from 1984 to April, 1986. ODU used a Hyrolob Sonde unit II from May, 1986 to February, 1997. ODU using a YSI 6000 from March, 1997 to March, 1998. ODU using a YSI 6600 V2 from April, 2008 to present. Purchased a YSI 6600 V2 and started using in April 2007. Doing a comparison study between this YSI and previous YSI. Did not submit this YSI data until instructed by VA DEQ, unless a problem with old YSI. On April 19, 2007 had to submit this data because old YSI was sent back to manufacturer for repairs.

PARAMETER NAME: DO, dissolved oxygen, in-situ membrane electrode

CBP METHOD: F01 for Clark Cell type DO probe. F04 for optical DO probe.

EPA METHOD OR OTHER DESCRIPTION: APHA - 4500-O G

REFERENCE: APHA. Standard Methods, 18th Edition.

ODU used an RS-5 salinometer from 1984 to April, 1986. ODU used a Hyrolob Sonde unit II from May, 1986 to February, 1997. ODU using a YSI 6000 from March, 1997 to March, 1998. ODU using a YSI 6600 V2 with optical DO probe from April, 2008 to present. Purchased a YSI 6600 V2 and started using in April 2007. Doing a comparison study between this YSI and previous YSI. Did not submit this YSI data until instructed by VA DEQ, unless a problem with old YSI. On April 19, 2007 had to submit this data because old YSI was sent back to manufacturer for repairs.

PARAMETER NAME: DOC, dissolved organic carbon, wet oxidation method

CBP METHOD: L02

EPA METHOD OR OTHER DESCRIPTION: APHA - 5310 D

REFERENCE: APHA, 1986. Standard Methods, 19th Edition Supplement. Method 5310 D.

ODU analyzed this parameter from 1989-1990. It was dropped as a parameter for the Elizabeth River by the VADEQ beginning in 1991.

PARAMETER NAME: DOC, dissolved organic carbon

CBP METHOD: L01

EPA METHOD OR OTHER DESCRIPTION: EPA Method No. 415.1.

REFERENCE: Combustion Infared Method.. EPA Method No. 415.1. USEPA. EPA. 1983. METHODS FOR CHEMICAL ANALYSIS OF WATER AND WASTES. USEPA-600/4-79-020. METHOD 415.1; PP. 415.1/1-3.

FILTERED SAMPLES (0.7 um FILTER) ARE PURGED WITH NITROGEN UNDER ACIDIC CONDITIONS TO REMOVE INORGANIC CARBON. THE ORGANIC CARBON IS CONVERTED TO CARBON DIOXIDE BY CATALYTIC COMBUSTION. THE CARBON DIOXIDE FORMED IS MEASURED DIRECTLY BY AN INFRARED DETECTOR.

Started analyzing this parameter at living resources station SBE5 in January 2007 for the surface.

PARAMETER NAME: EPAR_S, epar at surface

CBP METHOD: F01

EPA METHOD OR OTHER DESCRIPTION: Reference measurement for incident radiation at surface of the water. Photosynthetically active radiation (PAR) is measured in air using a flat cosine quantum light sensor (Li-cor, LI-190SA or equivalent) pointed upwards. Units are micromoles per second per square meter, which equal microeinsteins. One EPAR_S value is taken as close as possible in time to each underwater value collected.

REFERENCE:

ODU started analyzing this parameter in the Elizabeth River with the BAY176 (April, 1993) cruise.

PARAMETER NAME: EPARD_Z, in-situ, downwelling par

CBP METHOD: F01

EPA METHOD OR OTHER DESCRIPTION: Photosynthetically active radiation (PAR) is

measured underwater using a flat cosine quantum sensor (Li-cor LI-190SA or equivalent) pointing down in the water column. An initial underwater light reading is taken at 1.0 meter depth, then at 1.0 meter increments until the bottom or if the value is <1 m/m**2/s with the underwater upwelling probe before reaching bottom the light profile is terminated.

REFERENCE:

ODU started analyzing this parameter in the Elizabeth River in 1994. ODU stopped taking this parameter with the BAY295 (March, 1999) cruise with the approval of the CBP subcommities.

PARAMETER NAME: EPARU_Z, in-situ, upwelling par

CBP METHOD: F01

EPA METHOD OR OTHER DESCRIPTION: Photosynthetically active radiation (PAR) is measured underwater using a flat cosine quantum sensor (Li-cor LI-190SA or equivalent) pointing up in the water column. An initial underwater light reading is taken at 0.5 meter depth. Starting in June 2004, the depths for which light data is collected is determined by water clarity as measured by the secchi depth.(Previously it was collected at 0.5 meter increments until the bottom or if the value is <1 m/m**2/s with the underwater upwelling probe before reaching bottom the light profile is terminated.)

REFERENCE:

ODU started analyzing this parameter in the Elizabeth River with the BAY176 (April, 1993) cruise.

PARAMETER NAME: FSS, fixed suspended solids

CBP METHOD: L01

EPA METHOD OR OTHER DESCRIPTION: 160.4

REFERENCE: EPA, 1983. USEPA-600/4-79-020. Method 160.4.

In January 2002 this parameter was added to the Elizabeth River Monitoring Program at all stations.

PARAMETER NAME: NH4F, ammonia nitrogen, (filtered), colorimetric, automated phenate (indophenol)

CBP METHOD: L01

EPA METHOD OR OTHER DESCRIPTION: 350.1

REFERENCE: A. EPA, 1983. USEPA-600/4-79-020. Method 350.1.

B. EPA, 1993. EPA/600/R-93/100. Method 350.1, Rev 2.

ODU used a Scientific Instruments Corporation autoanalyzer from 1989 to April, 1997. In May, 1997 switched to a Skalar continuous flow analyzer.

In July 2008, the buffer solution used in this analysis was changed. The buffer solution for the ammonia analysis included both sodium potassium tartrate tetrahydrate and sodium citrate. The buffer is present for the prevention of precipitation due to salts. It was discovered sodium potassium tartrate tetrahydrate was a source of contamination in numerous ammonia analyses. The chemical was ordered from four vendors, all with the same result. When the analysis was run without the sodium potassium tartrate no precipitation was noted and, therefore, is not necessary. The ODU WQL will eliminate sodium potassium tartrate tetrahydrate from the ammonia buffer solution unless precipitation is noted, at which time it will be required.

PARAMETER NAME: NO23F, nitrite plus nitrate nitrogen (filtered), colorimetric, automated cadmium reduction.

CBP METHOD: L01

EPA METHOD OR OTHER DESCRIPTION: 353.2

REFERENCE: A. EPA, 1983. USEPA-600/4-79-020. Method 353.2.

B. EPA, 1993. EPA/600/R-93/100. Method 353.2, Rev 2.

ODU used a Scientific Instruments Corporation autoanalyzer from 1989 to December, 1995. In January, 1996 switched to a Skalar continuous flow analyzer.

PARAMETER NAME: NO2F, nitrite nitrogen (filtered), manual, colorimetric, diazotization

CBP METHOD:

EPA METHOD OR OTHER DESCRIPTION: APHA Method No. 413 B.

REFERENCE: APHA 1985. Standard Methods for Examination of Water and Wastewater. 16th ed., American Public Health Association, Washington, D.C.

ODU analyzed this parameter from 1989-1990. It was dropped as a parameter for the Elizabeth River by the VADEQ beginning in 1991.

PARAMETER NAME: PC, particulate carbon

CBP METHOD: L01

EPA METHOD OR OTHER DESCRIPTION: 440.0

REFERENCE: Methods for the Determination of Chemical Substances in Marine and Estuarine Matrices. 2nd Edition, 1997. Method 440.0.

ODU used a Carlo Erba N/A 1500 from 1988 until April 30,2001.

Starting May 1, 2001 ODU is using a CE Instruments Flash EA 1112 Elemantal Analyzer. A method comparison study between this new instrument and the Carlo Erba NA 1500 was completed. The results are reported in A Comparion of Two Instruments for the Determination of Particulate Carbon and Particulate Nitrogen Concentrations in Estuarine Water Samples.

PARAMETER NAME: PH, in-situ electrode method

CBP METHOD: F01

EPA METHOD OR OTHER DESCRIPTION: 150.1, A calibrated pH electrode, (corrects for temperature) attached to a multi-probe sonde, is lowered into a water body and allowed to stabilize prior to taking the meter reading.

REFERENCE: EPA, 1983. USEPA-600/4-79-020. Method 150.1.

PARAMETER NAME: PHEO, monochromatic, spectrophotometric

CBP METHOD: L01

EPA METHOD OR OTHER DESCRIPTION: APHA - 10200 H

REFERENCE: APHA, 1995. Standard Methods, 19th Edition, Method 10200 H.

Perkin Elmer dual beam spectrophotometer used until December, 1997. January 1998-December 2005 a Unicam UV1 dual beam spectrophotometer is used. January 2006-present a Shimadzu 2401PC dual beam spectrophotometer is used.

PARAMETER NAME: PN, particulate nitrogen

CBP METHOD: L01

EPA METHOD OR OTHER DESCRIPTION: 440.0

REFERENCE: EPA, 1997. 2nd Edition. Method 440.0

ODU used a Carlo Erba N/A 1500 from 1988 until April 30,2001.

PARAMETER NAME: PO4F, orthophosphate, (filtered), automated, ascobic acid

CBP METHOD: L01

EPA METHOD OR OTHER DESCRIPTION: 365.1, 365.5

REFERENCE: EPA, 1983. USEPA-600/4-79-020. Method 365.1.

EPA, 1993. EPA/600/R-93/100. Method 365.1, Rev 2.

EPA, 1997. 2nd Edition, EPA/600/R-97/072, Method 365.5

ODU started using this method in May, 1997 on the Skalar continuous analyzer.

PARAMETER NAME: PO4F, orthophosphate, (filtered), manual, ascobic acid

CBP METHOD:

EPA METHOD OR OTHER DESCRIPTION: 365.3

REFERENCE: EPA, 1983. USEPA-600/4-79-020. Method 365.3.

ODU used this method from 1989 to April, 1987.

PARAMETER NAME: PP, particulate phosphorus, semi-automated, direct

CBP METHOD: L01

EPA METHOD OR OTHER DESCRIPTION: Particulates on a 0.7um glass fiber filter are weighed, then combusted @ 550C to convert organically bound phosphorus to phosphate. Phosphate is extracted with HCL and measured by the automated ascorbic acid method for PO4.

REFERENCE: Aspila, Agemian and Chau, 1976. ''A Semi-automated

Method for the Determination of Inorganic, organic and Total Phosphate in Sediments'', Analyst 101:187-197. ODU used a Scientific Instruments Corporation autoanalyzer from 1989 to December, 1995. In January, 1996 switched to a Skalar continuous flow analyzer.

PARAMETER NAME: SALINITY, in-situ measurment

CBP METHOD: L01

EPA METHOD OR OTHER DESCRIPTION: In-situ measurement with probe

PARAMETER NAME: SECCHI, 20 cm secchi disk

CBP METHOD: F01

EPA METHOD OR OTHER DESCRIPTION: A 20 cm diameter secchi disk is lowered into the water and the depth (in meters) at which the black and white quadrants can no longer be distinguished is averaged with the depth at which the black and white quadrants can again be distinguised.

REFERENCE: Tyler, John. 1968. The Secchi Disk, Limnology and Oceanography, 13(1):1-6.

PARAMETER NAME: SIF, silica as SI, (filtered), colorimetric, automated, molybdenum blue

CBP METHOD: L01

EPA METHOD OR OTHER DESCRIPTION: 366.0

REFERENCE: Methods for the Determination of chemical Substances in Marine and Estuarine Matrices - 2nd Edition, 1997. Method 366.0 ''Dissolved Silicate in Estuarine and Coastal Waters''.

ODU analyzed this parameter from 1989-1990. It was dropped as a parameter for the Elizabeth River by the VADEQ beginning in 1991.

PARAMETER NAME: TDN, total dissolved nitrogen, alkaline persulfate wet oxidation + EPA

353.2

CBP METHOD: L01

EPA METHOD OR OTHER DESCRIPTION: Pre-filtered samples are run through an alkaline persulfate wet oxidation to change all N-containing compounds into nitrate. Nitrate concentration is determined using an auto analyzer equipped with a cadmium reduction column.

REFERENCE: D''Elia, C.F., P.A. Steudler and N. Corwin, 1977. ''Determination of Total Nitrogen in Aqueous Samples using Persulfate Digestion. Limnology and Oceanography, 22:760-764

ODU used a Scientific Instruments Corporation autoanalyzer from 1989 to December, 1995. In January, 1996 switched to a Skalar continuous flow analyzer.

PARAMETER NAME: TDP, total dissolved phosphorus, alkaline persulfate wet oxidation + EPA 365.1

CBP METHOD: L01

EPA METHOD OR OTHER DESCRIPTION: Filtered samples are run through an alkaline persulfate wet oxidation, which turns acidic and changes all P-containing compounds into phosphate. Phosphorus is measured as PO4 using EPA 365.1, an automated spectrophotometric method.

REFERENCE: D''Elia, C.F., P.A. Steudler and N. Corwin, 1977. ''Determination of Total Nitrogen in Aqueous Samples using Persulfate Digestion. Limnology and Oceanography,

22:760-764

ODU started using this method in July, 1997 on the Skalar continuous flow analyzer.

PARAMETER NAME: TDP, total dissolved phosphorus, colorimetric, manual, ascorbic acid

CBP METHOD:

EPA METHOD OR OTHER DESCRIPTION: 365.3

REFERENCE: EPA, 1983. USEPA-600/4-79-020. Method 365.3

ODU used this method from 1989 to June, 1997.

PARAMETER NAME: TP, total phosphorus, colorimetric, manual, ascorbic acid

CBP METHOD:

EPA METHOD OR OTHER DESCRIPTION: 365.3

REFERENCE: EPA, 1983. USEPA-600/4-79-020. Method 365.3.

This is a calculated parameter for the ERLTM Program.

PARAMETER NAME: TSS, total suspended solids, gravimetric, dried at 103-105 C

CBP METHOD: L01

EPA METHOD OR OTHER DESCRIPTION: 160.2

REFERENCE: EPA, 1983. USEPA-600/4-79-020. Method 160.2.

PARAMETER NAME: WTEMP, water temperature, in-situ

CBP METHOD: F01

EPA METHOD OR OTHER DESCRIPTION: 170.1

REFERENCE: EPA, 1983. USEPA-600/4-79-020. Method 170.1

Process_Date: Unknown

Spatial_Data_Organization_Information: top

Direct_Spatial_Reference_Method: Point

Spatial_Reference_Information: top

Horizontal_Coordinate_System_Definition:

Geographic:

Latitude_Resolution: 0.0010

Longitude_Resolution: 0.0010

Geographic_Coordinate_Units: decimal minutes

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6378137

Denominator_of_Flattening_Ratio: 298.257

Entity_and_Attribute_Information: top

Overview_Description:

Entity_and_Attribute_Overview:

In the database there are 6 data tables submitted: WQ_DATA, WQ_DATA_BMDL, WQ_KD, WQ_CHLOROPHYLL, WQ_CRUISES, WQ-QAQC and WQ_EVENT.

Entity_and_Attribute_Detail_Citation:

WQ_CRUISES table contains the cruise name, dates and comments about the cruise. The WQ_EVENT table contains weather data for the stations. The WQ_KD table contains light data collected during the vertical profile on stations. WQ_CHLOROPHYLL table contains the absorbance values, sample volumes filtered and extraction volumes for chlorophyll samples. The WQ_DATA table contains physiochemical profile data and nutrient data. The WQ_DATA_BMDL table contains the actual instrument values obtained for samples below the method detection limit. The WQ_QAQC table contains the accuracy and precision data for each analysis.

U.S. Chesapeake Bay Program, Water Quality Database Design and Data Dictionary, www.chesapeakebay.net/data/index.htm. See database Lookup Tables.

Distribution_Information: top

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Old Dominion University, Department of Chemistry and Biochemistry

Contact_Person: Suzanne C. Doughten

Contact_Position: Water Quality Supervisor

Contact_Address:

Address_Type: mailing and physical

Address: 4211 Colley Ave.

City: Norfolk

State_or_Province: Virginia

Postal_Code: 23508

Country: USA

Contact_Voice_Telephone: 757-451-3043

Contact_Facsimile_Telephone: 757-440-4005

Contact_Electronic_Mail_Address:

sdoughte_no_spam_@odu.edu [remove _no_spam_ for valid email address]

Distribution_Liability: none provided

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: Access Database File

Format_Version_Number: 97

Transfer_Size: 0.012 MB

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <http://www.chesapeakebay.net>

Fees: 0

Metadata_Reference_Information: top

Metadata_Date: 20021029

Metadata_Review_Date: 20080505

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Old Dominion University, Department of Chemistry and Biochemistry

Contact_Person: Suzanne C. Doughten

Contact_Position: Water Quality Supervisor

Contact_Address:

Address_Type: mailing and physical

Address: 4211 Colley Ave.

City: Norfolk

State_or_Province: Virginia

Postal_Code: 23508

Country: USA

Contact_Voice_Telephone: 757-451-3043

Contact_Facsimile_Telephone: 757-440-4005

Contact_Electronic_Mail_Address:

sdoughte_no_spam_@odu.edu [remove _no_spam_ for valid email address]

Metadata_Standard_Name: FGDC-STD-001-1998

Metadata_Standard_Version: FGDC-STD-001-1998

Generated by mp version 2.8.22 on Tue May 06 12:22:52 2008