Chesapeake Bay Program Water Quality Database

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: Chesapeake Bay Program Office

Publication_Date: 19841101

Title: Chesapeake Bay Program Water Quality Database

Geospatial_Data_Presentation_Form: spatial database

Description:

Abstract:

The Water Quality Monitoring database is a compilation of data for 19 parameters at 49 mainbay and approximately 150 tributary stations for Maryland, Virginia, and the District of Columbia with several state agencies and universities sharing in the collection and analysis of these data. The program was established as a long-term program of data collection and analysis to establish baseline water quality conditions in the Bay and to monitor changes in water quality conditions over time.

The program began in June, 1984 with stations sampled once each month during the colder late fall and winter months and twice each month in the warmer months. The collecting organizations coordinate the sampling times of their stations, so that data for each sampling event represents a synoptic picture of the mainbay at that point in time. The sampling frequency has changed over time, and some stations have been deleted or added. Parameters sampled include: temperature (WTEMP), dissolved oxygen (DO), conductivity (COND), salinity (SALINITY), ph (pH), secchi depth (SECCHI), chlorophyll a (CHLA), pheophytin (PHEO), silica, whole and filtered (SIW, SIF), total suspended solids (TSS), total phosphorus (TP), total dissolved phosphorus (TDP), particulate phosphorus (PP), orthophosphate whole and filtered (PO4W, PO4F), total dissolved nitrogen (TDN), total Kjeldahl nitrogen whole and filtered (TKNW, TKNF), nitrite plus nitrate whole and filtered (NO23W, NO23F), nitrite whole and filtered (NO2W, NO2F), nitrate whole and filtered (NO3W, NO3F), ammonium whole and filtered (NH4W, NH4F), particulate organic nitrogen (PN), total organic carbon (TOC), dissolved organic carbon (DOC), particulate organic carbon (POC). Some parameters have been dropped or replaced over time, and several additional parameters are available for the tributary stations.

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

Purpose:

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

Time_Period_of_Content:

Time_Period_Information:

Range_of_Dates/Times:

Beginning_Date: 19840615

Ending_Date: 20021231

Currentness_Reference: Ground Condition

Status:

Progress: In work

Maintenance_and_Update_Frequency: Monthly

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

Theme_Keyword: Bay

Theme_Keyword: Monitoring

Theme_Keyword: Nitrogen

Theme_Keyword: Nutrient

Theme_Keyword: Phosphorus

Theme_Keyword: Salinity

Theme_Keyword: Tributaries

Theme_Keyword: Water

Theme_Keyword: Water Quality

Place:

Place_Keyword_Thesaurus: CIMS Place Keyword List

Place_Keyword: Anacostia River

Place_Keyword: Appomattox River

Place_Keyword: Big Annemessex River

Place_Keyword: Bohemia River

Place_Keyword: Bush River

Place_Keyword: Chesapeake Bay

Place_Keyword: Chester River

Place_Keyword: Chickahominy River

Place_Keyword: Choptank River

Place_Keyword: D.C.

Place_Keyword: Eastern Ba

Place_Keyword: Hydrologic Unit

Place_Keyword: Major Watershed/Basin

Place_Keyword: Maryland (MD)

Place_Keyword: Monitoring Segment

Place_Keyword: Virginia (VA)

Place_Keyword: Washington

Access_Constraints: None

Use_Constraints: None

Data_Quality_Information:      top

Attribute_Accuracy:

Attribute_Accuracy_Report:

One of the goals of the CBP water quality database is to provide the data user with data of known and high quality. To assess the quality of a data set, the collection, preservation, and analytical methodologies must be documented for a specific application. Detailed documentation of methods, protocols, and quantitative proof of measurement control are essential and are part of the database. 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. CBP QA data include precision and accuracy comparisons within the same organization, and among results from different organizations.

Within-organization QA data: To assess within-organization precision and accuracy, approximately 10% of the chemical analyses for each parameter are analyzed in duplicate and spiked in the laboratories. Laboratory replicate and spike data are submitted to CBP separately for the mainstem. These data are maintained as separate data sets and are not included within the water quality database. At some stations, field replicates are also generated, and these are reported and included within the water quality database.

Field QA Data:

Field precision is estimated with field replicates. The CBP monitoring database contains two different types of field replicates, both identified by the variable SAMPLE_ID in the database.

Field splits: Maryland Department of Natural Resources (MDDNR) includes field splits of single grab samples in its data. Stations and layers which have field splits are: CB1.1 - B, CB2.2 - S, CB3.3- B, CB4.1W - S, CB4.2E - B, CB4.3C - AP, CB4.4 - B, and CB5.2 - S. Field replicates (separate grabs) are not collected. SAMPLE_ID would have the value of FS1 or FS2 for these stations.

In the Virginia mainbay, Virginia Institute of Marine Science (VIMS) began collecting field splits during the first April cruise, 1989. (Prior to that date they collected single samples.) The mean, but not the separate results from each of the splits were submitted in the regular monitoring data sets. The corresponding QA data set has the value of one replicate and the standard deviation with the parameter, REP_TYPE, set to ''FLD''. In the water quality database, SAMPLE_ID would have a value of FS_AVG for these samples.

Field replicates: Old Dominion University collects true field replicate samples (separate grabs) at a specified station (first CB7.3 and then CB7.4N) and includes these as individual observations in both its monitoring and QA data submissions. SAMPLE_ID for these monitoring data will have values of ''S1'' or ''S2''.

Laboratory QA: Within-orgainization laboratory precision and accuracy are estimated with laboratory replicates and laboratory spike samples. Ten percent of samples coming into the laboratory are randomly selected (on a parameter by parameter basis) for lab replicate analysis. For those lab replicates, the mean of the two results is the value reported in the monitoring and QA data sets. The mean, standard deviation, and sample size are reported in the QA data set.

Inter-organization QA data:

In Virginia, VIMS and ODU exchanged field split samples from 1985 through 1989; these results were analyzed in Bergstrom (1989), ''Split sample water quality results from laboratories participating in the Chesapeake Bay Program: 1985-1989''. In Maryland, DNR laboratories became involved in mainstem splits when the Coordinated Split Sample Program (CSSP) began in 1988.

The 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. Labs from each component analyze triplicate field samples that are collected quarterly with the exception of the fall line component which is sampled twice a year. 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 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.

In the process of reviewing the program design and implementation, questions were raised which required investigation. In 1990 the Data Analysis Issues Tracking System (DAITS) was establisted to insure that these issues received appropriate attention and to provide thorough documentation of this process for future users. Pending issues are usually referred to members of the appropriate Monitoring Subcommittee (MSC) workgroup for resolution. DAITS issues are stored on the CBP LAN as a series of WordPerfect files.

For more information on methodologies, data quality, and DAITS issues see the ''Guide to Using the Chesapeake Bay Program Water Quality Monitoring Data'' at www.chesapeakebay.net/data/index.htm

Logical_Consistency_Report: None

Completeness_Report:

When the monitoring program began in June, 1984, there were 20 cruises scheduled for the VA and MD mainbay - one each in Nov, Dec, Jan, Feb, and two each in all other months. Through time, the following changes in number of cruises per year for VA and MD have occurred:

YEAR VA MD 1984-1987 20 20 1988 19 20 (VA drops 2nd Mar cruise) 1989-1995 18 20 (VA drops 1 more cruise-2nd Oct) 1996 14 16 (Va drops 4 more cruises-2nd Apr,May, Jun,Sep; MD drops 2nd Mar,Jun,Sep,Oct cruises) 1997-1998 14 14 (MD drops 2 more cruises-Jan,Feb as part of budget ''refinement'') 1999-2000 14 16 (MD reinstates Jan, Feb cruises)

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

Still other stations have not been sampled routinely during the winter months: CB3.3E, CB3.3W, CB4.1E, CB4.1W, CB4.2E, CB4.2W, CB4.3E, CB4.3W.

Water quality values may be removed from CBP data sets or the value may have an associated analysis problem code value in the ''PROBLEM'' field for a variety of quality control reasons. The WQ_CRUISE table COMMENTS field should document events where lab problems resulted in missing values for a parameter.

For the period June, 1984 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

Positional_Accuracy:

Horizontal_Positional_Accuracy:

Horizontal_Positional_Accuracy_Report: NA

Vertical_Positional_Accuracy:

Vertical_Positional_Accuracy_Report: NA

Lineage:

Process_Step:

Process_Description:

This listing of parameters and method descriptions pertains to the current method codes. To review the complete table of all methods used throughout the program, see www.chesapeakebay.net/data/index.htm. The first character in the CBP METHOD denotes whether the value is Calculated, measured in the Field, or measured in the Laboratory.

PARAMETER NAME: BIOSI, particulate biogenic silica CBP METHOD: L01 EPA METHOD OR OTHER DESCRIPTION: Particulates collected on a 0.4 um polycarbonate filter undergo a mild digestion using 0.2 N NAOH. Silicon is analyzed colorimetrically using an automated silicomolybdate method at a wave length of 660 or 810 nm. REFERENCE: Technicon Industrial Method No.186-72W, Silicates in Water and Seawater, (1973)

PARAMETER NAME: BOD5F, 5-day biochemical oxygen demand (filtered) CBP METHOD: L01 EPA METHOD OR OTHER DESCRIPTION: 405.1 REFERENCE: EPA, 1983. USEPA-600/4-79-020

PARAMETER NAME: BOD5W, 5-day biochemical oxygen demand (whole) CBP METHOD: L01 EPA METHOD OR OTHER DESCRIPTION: 405.1 REFERENCE: EPA, 1983. USEPA-600/4-79-020

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.

PARAMETER NAME: COND, 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:

PARAMETER NAME: DO, dissolved oxygen, in-situ membrane electrode CBP METHOD: F01 EPA METHOD OR OTHER DESCRIPTION: APHA - 4500-O G REFERENCE: APHA. Standard Methods, 18th Edition.

PARAMETER NAME: DOC, dissolved organic carbon, combustion infrared method CBP METHOD: L01 EPA METHOD OR OTHER DESCRIPTION: APHA - 5310 B REFERENCE: APHA, 1980. Standard Methods, 14th Edition. 19th Edition (1996): Method 5310 B.

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.

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:

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 up in the water column. An initial underwater light reading is taken at 0.1 meter depth, then at 0.5 meter increments until a value of approximately 10 micromoles per second per square meter is obtained. REFERENCE:

PARAMETER NAME: FCOLI, fecal coliform, EC medium, MPN CBP METHOD: L01 EPA METHOD OR OTHER DESCRIPTION: APHA - 908 C REFERENCE: APHA, 1985. Standard Methods, 16th Edition, Method 908 C.

PARAMETER NAME: FCOLI, fecal coliform, direct test, A-1 medium CBP METHOD: L03 EPA METHOD OR OTHER DESCRIPTION: APHA - 9221 E REFERENCE: APHA, 1985. Standard Methods, 16th Edition, Method 908 C.

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.

PARAMETER NAME: FSSED, fixed suspended sediment CBP METHOD: L01 EPA METHOD OR OTHER DESCRIPTION: The filter and residue obtained from the determination of total suspended sediment is ignited at 550 +/- 50 degrees centigrade in a muffle furnace. The final weight of the residue in mg/l is the fixed suspended sediments (FSSED). REFERENCE: Fishman and Friedman, 1985. Methods for Determination of Inorganic Substances in Water and Fluvial Sediments. TWRI-USGS, Book 5, Chapter C1, Laboratory Theory and Methods for Sediment Analysis, PP.11-18 USGS, Denver Colorado, 1985.

PARAMETER NAME: HARDNESS, titrimetric, EDTA CBP METHOD: L02 EPA METHOD OR OTHER DESCRIPTION: 130.2 REFERENCE: EPA, 1983. USEPA-600/4-79-020. Method 130.2

PARAMETER NAME: HARDNESS, colorimetric, automated EDTA CBP METHOD: L01 EPA METHOD OR OTHER DESCRIPTION: 130.1 REFERENCE: EPA, 1983. USEPA-600/4-79-020. Method 130.1

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.

PARAMETER NAME: NH4F, ammonia nitrogen, (filtered), colorimetric, auto salicylate-hypochlorite CBP METHOD: L02 EPA METHOD OR OTHER DESCRIPTION: Ammonia in a filtered sample reacts with sodium salicylate, sodium nitroprusside and sodium hypochlorite in an alkaline medium to form an intensely colored compound. The resulting color is directly proportional to the concentration of ammonia present. The solution''s color is intensified by sodium nitroprusside, heated and read colorimetrically using an autoanalyzer. REFERENCE: Fishman and Friedman, 1985. Methods for Determination of Inorganic Substances in Water and Fluvial Sediments. Techniques of water-resources Investigations of the United States Geological Survey, Book 5, Chapter A1, Denver Colorado, 1985. Method 1-2522-85.

PARAMETER NAME: NH4W, ammonia nitrogen, (whole), 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.

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

PARAMETER NAME: NO23W, nitrite plus nitrate nitrogen, (whole), colorimetric, automated cadmium reduci CBP METHOD: L01 EPA METHOD OR OTHER DESCRIPTION: 353.2 REFERENCE: EPA, 1983. USEPA-600/4-79-020. Method 353.2.

PARAMETER NAME: NO2F, nitrite nitrogen (filtered), automated, colorimetric, diazotization CBP METHOD: L01 EPA METHOD OR OTHER DESCRIPTION: 353.2 REFERENCE: EPA, 1983. USEPA-600/4-79-020. Method 353.2.

PARAMETER NAME: NO2W, nitrite nitrogen (whole), automated, colorimetric, diazotization CBP METHOD: L01 EPA METHOD OR OTHER DESCRIPTION: 353.2 REFERENCE: EPA, 1983. USEPA-600/4-79-020. Method 353.2.

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.

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: PH, electrode method CBP METHOD: F02 EPA METHOD OR OTHER DESCRIPTION: 150.1, A grab sample is collected and measured in the field using a portable PH meter (temperature corrected). 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.

PARAMETER NAME: PN, particulate nitrogen CBP METHOD: L01 EPA METHOD OR OTHER DESCRIPTION: 440.0 REFERENCE: EPA, 1997. 2nd Edition. Method 440.0

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

PARAMETER NAME: PO4W, (whole), orthophosphate, 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

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.

PARAMETER NAME: SALINITY, in-situ measurment CBP METHOD: L01 EPA METHOD OR OTHER DESCRIPTION: In-situ measurement with probe REFERENCE:

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''.

PARAMETER NAME: TALK, alkalinity, titrimetric, ph 4.5 CBP METHOD: L01 EPA METHOD OR OTHER DESCRIPTION: 310.1 REFERENCE: EPA, 1983, USEPA-600/4-79-020. Method 310.1.

PARAMETER NAME: TCOLI, total coliforms, standard fermemtation technique (MPN) CBP METHOD: L01 EPA METHOD OR OTHER DESCRIPTION: APHA - 908 A REFERENCE: APHA, 1985. Standard Methods, 16th Edition. Method 908 A.

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

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

PARAMETER NAME: TDP, total dissolved phosphorus, colorimetric, automated, ascorbic acid CBP METHOD: L04 EPA METHOD OR OTHER DESCRIPTION: 365.1 REFERENCE: EPA, 1983. USEPA-600/4-79-020. Method 365.1

PARAMETER NAME: TDP, total dissolved phosphorus, block digestor, automated AAII CBP METHOD: L05 EPA METHOD OR OTHER DESCRIPTION: 365.4 REFERENCE: EPA, 1983. USEPA-600/4-79-020. Method 365.4.

PARAMETER NAME: TKNF, total Kjeldahl nitrogen (filtered), semi-automated block digestor, colorimetric, nitro CBP METHOD: L02 EPA METHOD OR OTHER DESCRIPTION: 351.2 REFERENCE: EPA, 1983. USEPA-600/4-79-002. Method 351.2.

PARAMETER NAME: TKNW, total Kjeldahl nitrogen (whole), semi-automated block digestor, colorimetric, nitro CBP METHOD: L02 EPA METHOD OR OTHER DESCRIPTION: 351.2 REFERENCE: EPA, 1983. USEPA-600/4-79-002. Method 351.2.

PARAMETER NAME: TOC, total organic carbon, combustion infrared CBP METHOD: L01 EPA METHOD OR OTHER DESCRIPTION: 415.1 REFERENCE: EPA, 1983. USEPA-600/4-79-002. Method 415.1.

PARAMETER NAME: TOC, total organic carbon, wet oxidation CBP METHOD: L02 EPA METHOD OR OTHER DESCRIPTION: APHA - 5310 D REFERENCE: APHA, 1996. Standard Methods, 19th Edition Supplement, Method 5310 D.

PARAMETER NAME: TP, total phosphorus, colorimetric, automated, block digestor AAII CBP METHOD: L01 EPA METHOD OR OTHER DESCRIPTION: 365.4 REFERENCE: EPA, 1983. USEPA-600/4-79-020. Method 365.4.

PARAMETER NAME: TP, total phosphorus, colorimetric, automated, ascorbic acid CBP METHOD: L04 EPA METHOD OR OTHER DESCRIPTION: 365.1 REFERENCE: EPA, 1983. USEPA-600/4-79-020. Method 365.1.

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: TSSED, total suspended sediment, gravimetric, filtration, dried at 104 C CBP METHOD: L01 EPA METHOD OR OTHER DESCRIPTION: An entire water sample is filtered through one or more 0.45 um membrane filters. The filter(s) and residue are dried at 104 C. Weighing is done on an analytical balance. Filters (clean and with residue) are stored in a dessicator prior to weighing. REFERENCE: Fishman and Friedman, 1985. Methods for Determination of Inorganic Substances in Water and Fluvial Sediments. TWRI-USGS, Book 5, Chapter C1, Laboratory Theory and Methods for Sediment Analysis, PP. 11-18. USGS, Denver Colorado, 1985.

PARAMETER NAME: TURB_NTU, turbidity, nephelometric method CBP METHOD: L01 EPA METHOD OR OTHER DESCRIPTION: 180.1 REFERENCE: EPA, 1993. EPA/600/R93/100, Method 180.1, Rev 2.

PARAMETER NAME: VSS, volatile suspended solids, gravimetric, ignition at 550 C CBP METHOD: L01 EPA METHOD OR OTHER DESCRIPTION: 160.4 REFERENCE: EPA, 1983. USEPA-600/4-79-020. Method 160.4

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: 9.9999905

Longitude_Resolution: 9.9999905

Geographic_Coordinate_Units: decimal degrees

Geodetic_Model:

Horizontal_Datum_Name: North American Datum of 1983

Ellipsoid_Name: Geodetic Reference System 80

Semi-major_Axis: 6,378,137

Denominator_of_Flattening_Ratio: 298.257

Entity_and_Attribute_Information:      top

Overview_Description:

Entity_and_Attribute_Overview:

Water Quality - CBP water quality monitoring data for the Chesapeake Bay and tributaries, 1984-2000.

The sources of data are U.S. EPA Chesapeake Bay Program, Virginia Department of Environmental Quality, Maryland Department of Natural Resources, District of Columbia Department of Health.

Entity_and_Attribute_Detail_Citation:

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

Data table and associated lookup tables are described on the CBP web site, www.chesapeakebay.net, under Data Hub, Water Quality, Documentation, CIMS Data Upload and Quality Assurance Tool User's Guide and the Water Quality Data Dictionary.

Distribution_Information:      top

Distributor:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Chesapeake Bay Program Office

Contact_Person: Ricky Bahner

Contact_Position: wq database manager

Contact_Address:

Address_Type: mailing and physical

Address: CBP, 109 Severn Ave.

City: Annapolis

State_or_Province: Maryland

Postal_Code: 21403

Country: USA

Contact_Voice_Telephone: 410 267 5742

Contact_Facsimile_Telephone: 410 267 5777

Contact_Electronic_Mail_Address:

bahner.ricky_no_spam_@epa.gov [remove _no_spam_ for valid email address]

Distribution_Liability:

The user of this database should carefully review all pertinent documentation.

All CBP funded and in-kind match projects which involve the collection of environmental data are required to document all aspects of their project's sampling design, sample collection, analysis, quality control, and data management activities in a quality assurance project plan.

All water quality data are submitted or translated to the format described in the Water Quality Database Design and Data Dictionary.

Additionally a User's Guide is available to assist the user through the data analysis process.

Standard_Order_Process:

Digital_Form:

Digital_Transfer_Information:

Format_Name: Access Database File

Format_Version_Number: 97

Transfer_Size: 0.514 MB

Digital_Transfer_Option:

Online_Option:

Computer_Contact_Information:

Network_Address:

Network_Resource_Name: <http://www.chesapeakebay.net/data/type.cfm?DB=CBP_WQ>

Fees: none

Metadata_Reference_Information:      top

Metadata_Date: 20020716

Metadata_Review_Date: 20030227

Metadata_Contact:

Contact_Information:

Contact_Organization_Primary:

Contact_Organization: Chesapeake Bay Program Office

Contact_Person: Ricky Bahner

Contact_Position: wq database manager

Contact_Address:

Address_Type: mailing and physical

Address: CBP, 109 Severn Ave.

City: Annapolis

State_or_Province: Maryland

Postal_Code: 21403

Country: USA

Contact_Voice_Telephone: 410 267 5742

Contact_Facsimile_Telephone: 410 267 5777

Contact_Electronic_Mail_Address:

bahner.ricky_no_spam_@epa.gov [remove _no_spam_ for valid email address]

Metadata_Standard_Name: FGDC-STD-001-1998

Metadata_Standard_Version: FGDC-STD-001-1998