Data Package Metadata View Summary

Interagency Ecological Program: Discrete water quality monitoring in the Sacramento-San Joaquin Bay-Delta, collected by the Environmental Monitoring Program, 1975-2023

General Information

Data Package:

Local Identifier:

edi.458.13

Title:

Interagency Ecological Program: Discrete water quality monitoring in the Sacramento-San Joaquin Bay-Delta, collected by the Environmental Monitoring Program, 1975-2023

Alternate Identifier:

DOI PLACE HOLDER

Abstract:

\<markdown\>

The Interagency Ecological Program’s (IEP) Environmental Monitoring Program (EMP) was initiated in compliance with the Water Right Decision D-1379 (now mandated by Water Right Decision D-1641) and has monitored discrete water quality and nutrients in the upper San Francisco Estuary since 1975. The objectives of the EMP are to obtain consistent and accurate monthly data at established monitoring stations, provide and document information necessary to achieve compliance with salinity, flow, and dissolved oxygen standards, and to report this information for the purpose of management and conservation of the upper San Francisco Estuary. While the EMP also collects biological data, this dataset only includes the discrete water quality and nutrient data collected by the EMP from 1975-2021.

Links to other EMP datasets can be found [here](https://emp-des.github.io/emp-reports/data-links.html)

\</markdown\>

Publication Date:

2024-07-22

For more information:
Visit:	DOI PLACE HOLDER

Time Period

Begin:

1975-01-07

End:

2021-12-16

People and Organizations
Contact:	Battey, Morgan (California Department of Water Resources, Environmental Scientist) [ email ]
Creator:	Battey, Morgan (California Department of Water Resources, Environmental Scientist)
Creator:	Perry, Sarah (California Department of Water Resources, Environmental Scientist)
Associate:	Flynn, Theodore M (California Department of Water Resources, supervisor)
Associate:	Lesmeister, Sarah (Sacramento-San Joaquin Delta Conservancy, supervisor)
Associate:	Philippart, Shaun (California Department of Water Resources, supervisor)
Associate:	Santos, Eric (California Department of Water Resources, captain)
Associate:	Van Ark, Nicholas (California Department of Water Resources, captain)
Associate:	Sakata, Nicholas (US Bureau of Reclaimation, captain, captain)
Associate:	Manning, Juliana (California Department of Water Resources, lead)
Associate:	Rinde, Jenna (California Department of Fish and Wildlife, lead)
Associate:	Rasmussen, Nick (California Department of Water Resources, lead)
Associate:	Noble-Sakata, Brianne (California Department of Water Resources, lead)
Associate:	Richardson, Laurel (California Department of Water Resources, field crew)
Associate:	Finger, Dennis (California Department of Water Resources, field crew)
Associate:	Miller, Caitlin (California Department of Water Resources, field crew)
Associate:	Waller, Scott (California Department of Water Resources, field crew)
Associate:	Michelle, Nelson (California Department of Water Resources, field crew)
Associate:	Tran, Andrew (California Department of Water Resources, field crew)
Associate:	Cahoon, Torianne (California Department of Water Resources, field crew)
Associate:	Arena, Brian (California Department of Water Resources, field crew)
Associate:	Watkins, Brooke (California Department of Water Resources, field crew)
Associate:	Interagency Ecological Program

Data Entities
Data Table Name:	EMP_DWQ_1975_2023
Description:	Water quality data from the California Bay-Delta watershed collected by the CA Dept. of Water Resources' Environmental Monitoring Program.
Data Table Name:	EMP_DWQ_Stations_1975-2023
Description:	A list of stations in the San Francisco Bay-Delta Estuary sampled by the EMP during the years 1975-2022.
Data Table Name:	EMP_DWQ_FlagCodes
Description:	A list of quality assurance codes corresponding to the “flags” column in the main data table.
Other Name:	EMP_DWQ_metadata_methods
Description:	Tables describing field and lab methods

Detailed Metadata

Data Entities

Data Table


Data:	https://pasta-s.lternet.edu/package/data/eml/edi/458/13/a8ca73ec21f14b58caf2152720403cf3
Name:	EMP_DWQ_1975_2023
Description:	Water quality data from the California Bay-Delta watershed collected by the CA Dept. of Water Resources' Environmental Monitoring Program.
Number of Records:	17677
Number of Columns:	71

Table Structure

Object Name:

EMP_DWQ_1975_2023.csv

Size:

4473815 byte

Authentication:

bc91af6bccda53389b7fa7adebbc2efb Calculated By MD5

Text Format:

Number of Header Lines:

Record Delimiter:

\r\n

Orientation:

column

Simple Delimited:

Field Delimiter:	,
Quote Character:	"

Table Column Descriptions

Station

Date

Time

SampleDescription

Flag

FlagDescription

FieldNotes

Weather

AirTemp

WindVelocity

WindDirection

Chla_Sign

Chla

TotAlkalinity_Sign

TotAmmonia_Sign

TotAmmonia

DissAmmonia_Sign

DissAmmonia

DissBromide_Sign

DissBromide

DissCalcium_Sign

DissCalcium

TotChloride_Sign

TotChloride

DissChloride_Sign

DissChloride

DissNitrateNitrite_Sign

DissNitrateNitrite

DOC_Sign

DOC

TOC_Sign

TOC

DON_Sign

DON

TON_Sign

TON

DissOrthophos_Sign

DissOrthophos

TotPhos_Sign

TotPhos

DissSilica_Sign

DissSilica

TDS_Sign

TDS

TSS_Sign

TSS

VSS_Sign

VSS

TKN_Sign

TKN

Microcystis

SpCndSurface

DOSurface

DOpercentSurface

WTSurface

TurbiditySurface

pHSurface

SpCndBottom

DOBottom

DOpercentBottom

WTBottom

TurbidityBottom

pHBottom

Column Name:

Station

Date

Time

SampleDescription

Flag

FlagDescription

FieldNotes

Weather

AirTemp

WindVelocity

WindDirection

Latitude

Longitude

Chla_Sign

Chla

Pheoa_Sign

Pheoa

TotAlkalinity_Sign

TotAlkalinity

TotAmmonia_Sign

TotAmmonia

DissAmmonia_Sign

DissAmmonia

DissBromide_Sign

DissBromide

DissCalcium_Sign

DissCalcium

TotChloride_Sign

TotChloride

DissChloride_Sign

DissChloride

DissNitrateNitrite_Sign

DissNitrateNitrite

DOC_Sign

DOC

TOC_Sign

TOC

DON_Sign

DON

TON_Sign

TON

DissOrthophos_Sign

DissOrthophos

TotPhos_Sign

TotPhos

DissSilica_Sign

DissSilica

TDS_Sign

TDS

TSS_Sign

TSS

VSS_Sign

VSS

TKN_Sign

TKN

WaterDepth

Secchi

Microcystis

LightExtinction

SpCndSurface

DOSurface

DOpercentSurface

WaterTempSurface

TurbiditySurface

pHSurface

SpCndBottom

DOBottom

DOpercentBottom

WaterTempBottom

TurbidityBottom

pHBottom

Definition:

Station name

Date of sample collection

Time of sample collection in Pacific Standard Time

Description of the sample collected

Quality control flag assigned to the sample

Description of the quality control flag

Field notes recorded during sampling

Weather observations recorded during sampling

Air temperature recorded during sampling

Wind velocity recorded during sampling

Wind direction recorded during sampling

North latitude coordinate (entrapment zone stations only)

West longitude coordinate (entrapment zone stations only)

Sign indicating if chlorophyll a measurements were below reporting limit or not

Chlorophyll a 1-meter below water surface. If sign column is < for this analyte, then the value in this column is the reporting limit.

Sign indicating if pheophytin a measurements were below reporting limit or not

Pheophytin a 1-meter below water surface. If sign column is < for this analyte, then the value in this column is the reporting limit.

Sign indicating if total alkalinity measurements were below reporting limit or not.

Total alkalinity 1-meter below water surface. If sign column is < for this analyte, then the value in this column is the reporting limit.

Sign indicating if total ammonia measurements were below reporting limit or not.

Total ammonia 1-meter below water surface. If sign column is < for this analyte, then the value in this column is the reporting limit.

Sign indicating if dissolved ammonia measurements were below reporting limit or not.

Dissolved ammonia 1-meter below water surface. If sign column is < for this analyte, then the value in this column is the reporting limit.

Sign indicating if dissolved bromide measurements were below reporting limit or not.

Dissolved bromide 1-meter below water surface. If sign column is < for this analyte, then the value in this column is the reporting limit.

Sign indicating if dissolved calcium measurements were below reporting limit or not.

Dissolved calcium 1-meter below water surface. If sign column is < for this analyte, then the value in this column is the reporting limit.

Sign indicating if total chloride measurements were below reporting limit or not.

Total chloride 1-meter below water surface. If sign column is < for this analyte, then the value in this column is the reporting limit.

Sign indicating if dissolved chloride measurements were below reporting limit or not.

Dissolved chloride 1-meter below water surface. If sign column is < for this analyte, then the value in this column is the reporting limit.

Sign indicating if dissolved nitrate nitrite measurements were below reporting limit or not.

Dissolved nitrate + nitrite 1-meter below water surface. If sign column is < for this analyte, then the value in this column is the reporting limit.

Sign indicating if dissolved organic carbon measurements were below reporting limit or not.

Dissolved organic carbon 1-meter below water surface. If sign column is < for this analyte, then the value in this column is the reporting limit.

Sign indicating if total organic carbon measurements were below reporting limit or not.

Total organic carbon 1-meter below water surface. If sign column is < for this analyte, then the value in this column is the reporting limit.

Sign indicating if dissolved organic nitrogen measurements were below reporting limit or not.

Dissolved organic nitrogen 1-meter below water surface. If sign column is < for this analyte, then the value in this column is the reporting limit.

Sign indicating if total organic nitrogen measurements were below reporting limit or not.

Total organic nitrogen 1-meter below water surface. If sign column is < for this analyte, then the value in this column is the reporting limit.

Sign indicating if dissolved orthophosphate measurements were below reporting limit or not.

Dissolved ortho-phosphate 1-meter below water surface. If sign column is < for this analyte, then the value in this column is the reporting limit.

Sign indicating if total phosphorus measurements were below reporting limit or not.

Total Phosphorus 1-meter below water surface. If sign column is < for this analyte, then the value in this column is the reporting limit.

Sign indicating if dissolved silica measurements were below reporting limit or not.

Dissolved Silica 1-meter below water surface. If sign column is < for this analyte, then the value in this column is the reporting limit.

Sign indicating if total dissolved solids measurements were below reporting limit or not.

Total dissolved solids 1-meter below water surface. If sign column is < for this analyte, then the value in this column is the reporting limit.

Sign indicating if total suspended solids measurements were below reporting limit or not.

Total suspended solids 1-meter below water surface. If sign column is < for this analyte, then the value in this column is the reporting limit.

Sign indicating if volatile suspended solids measurements were below reporting limit or not.

Volatile suspended solids 1-meter below water surface. If sign column is < for this analyte, then the value in this column is the reporting limit.

Sign indicating if total Kjeldahl nitrogen measurements were below reporting limit or not.

Total Kjeldahl nitrogen 1-meter below water surface. If sign column is < for this analyte, then the value in this column is the reporting limit.

Water depth of station

Secchi depth measurement of light penetration below water surface

Visual observation rating of Microcystis aeruginosa, with 1 meaning absent, 2 low, 3 medium, 4 high, and 5 very high

Depth at which sunlight is extinguished to 1% of surface intensity

Specific conductance of water 1-meter below water surface

Dissolved oxygen concentration 1-meter below water surface

Water temperature 1-meter below water surface

Turbidity of water 1-meter below water surface

Total pH 1-meter below water surface

Specific conductivity 1-meter above bottom of channe

Dissolved oxygen concentration 1-meter above bottom of channel

Water temperature 1-meter above bottom of channel

Turbidity of water 1-meter above bottom of channel

Total pH 1-meter above bottom of channel

Storage Type:

string

dateTime

string

float

string

float

string

float

string

float

string

float

string

float

string

float

string

float

string

float

string

float

string

float

string

float

string

float

string

float

string

float

string

float

string

float

string

float

string

float

string

float

string

float

string

float

string

float

Measurement Type:

nominal

dateTime

nominal

ratio

nominal

ratio

nominal

ratio

nominal

ratio

nominal

ratio

nominal

ratio

nominal

ratio

nominal

ratio

nominal

ratio

nominal

ratio

nominal

ratio

nominal

ratio

nominal

ratio

nominal

ratio

nominal

ratio

nominal

ratio

nominal

ratio

nominal

ratio

nominal

ratio

nominal

ratio

nominal

ratio

nominal

ratio

nominal

ratio

Measurement Values Domain:

Definition

text

Format	YYYY-MM-DD
Precision

Definition

text

Definition

text

Definition

text

Definition

text

Definition

text

Definition

text

Unit	fahrenheit
Type	real

Unit	milePerHour
Type	real

Unit	degree
Type	real

Unit	decimalDegree
Type	real

Unit	decimalDegree
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	<
Definition	less than
Source

Code Definition

Code	=
Definition	equal to
Source

Unit	microgramPerLiter
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	<
Definition	less than
Source

Code Definition

Code	=
Definition	equal to
Source

Unit	microgramPerLiter
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	=
Definition	equal to
Source

Unit	milligramPerLiterAsCalciumCarbonate
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	=
Definition	equal to
Source

Unit	milligramPerLiterAsNitrogen
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	<
Definition	less than
Source

Code Definition

Code	=
Definition	equal to
Source

Unit	milligramPerLiterAsNitrogen
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	<
Definition	less than
Source

Code Definition

Code	=
Definition	equal to
Source

Unit	milligramPerLiter
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	<
Definition	less than
Source

Code Definition

Code	=
Definition	equal to
Source

Unit	milligramPerLiter
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	=
Definition	equal to
Source

Unit	milligramPerLiter
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	=
Definition	equal to
Source

Unit	millgramPerLiter
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	<
Definition	less than
Source

Code Definition

Code	=
Definition	equal to
Source

Unit	milligramPerLiterAsNitrogen
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	<
Definition	less than
Source

Code Definition

Code	=
Definition	equal to
Source

Unit	milligramPerLiter
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	<
Definition	less than
Source

Code Definition

Code	=
Definition	equal to
Source

Unit	milligramPerLiter
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	<
Definition	less than
Source

Code Definition

Code	=
Definition	equal to
Source

Unit	milligramPerLiter
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	=
Definition	equal to
Source

Unit	milligramPerLiter
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	<
Definition	less than
Source

Code Definition

Code	=
Definition	equal to
Source

Unit	milligramPerLiterAsPhosphorus
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	<
Definition	less than
Source

Code Definition

Code	=
Definition	equal to
Source

Unit	milligramPerLiterAsPhosphorus
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	<
Definition	less than
Source

Code Definition

Code	=
Definition	equal to
Source

Unit	milligramPerLiter
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	=
Definition	equal to
Source

Unit	milligramPerLiter
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	<
Definition	less than
Source

Code Definition

Code	=
Definition	equal to
Source

Unit	milligramPerLiter
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	<
Definition	less than
Source

Code Definition

Code	=
Definition	equal to
Source

Unit	milligramPerLiter
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	<
Definition	less than
Source

Code Definition

Code	=
Definition	equal to
Source

Unit	milligramPerLiter
Type	real

Unit	foot
Type	real

Unit	centimeter
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	1
Definition	absent
Source

Code Definition

Code	2
Definition	low
Source

Code Definition

Code	3
Definition	medium
Source

Code Definition

Code	4
Definition	high
Source

Unit	meter
Type	real

Unit	microSeimenPerCentimeter
Type	real

Unit	milligramPerLiter
Type	real

Unit	percentSaturation
Type	real

Unit	celsius
Type	real

Unit	FormazinNephelometricUnit
Type	real

Unit	unitless
Type	real

Unit	microSeimenPerCentimeter
Type	real

Unit	milligramPerLiter
Type	real

Unit	percentSaturation
Type	real

Unit	celsius
Type	real

Unit	FormazinNephelometricUnit
Type	real

Unit	unitless
Type	real

Missing Value Code:

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing data

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing data

Code	NA
Expl	missing value

Code	NA
Expl	missing data

Code	NA
Expl	missing data

Code	NA
Expl	missing data

Code	NA
Expl	missing data

Code	NA
Expl	missing data

Code	NA
Expl	missing data

Code	NA
Expl	missing data

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing value

Code	NA
Expl	missing unit

Code	NA
Expl	missing value

Accuracy Report:

Accuracy Assessment:

Coverage:

Methods:

Data Table


Data:	https://pasta-s.lternet.edu/package/data/eml/edi/458/13/ada2f452284c8d88cde03fdf98280dc9
Name:	EMP_DWQ_Stations_1975-2023
Description:	A list of stations in the San Francisco Bay-Delta Estuary sampled by the EMP during the years 1975-2022.
Number of Records:	48
Number of Columns:	10

Table Structure

Object Name:

EMP_DWQ_Stations_1975-2023.csv

Size:

5477 byte

Authentication:

1ab8b2fda08741342370693af58f6091 Calculated By MD5

Text Format:

Number of Header Lines:

Record Delimiter:

\r\n

Orientation:

column

Simple Delimited:

Field Delimiter:	,
Quote Character:	"

Table Column Descriptions

Station

StationID

Location

StationType

Latitude

Longitude

Status

StartDate

EndDate

StationPaused

Column Name:

Station

StationID

Location

StationType

Latitude

Longitude

Status

StartDate

EndDate

StationPaused

Definition:

Station name

Broad water body number, light channel marker number, or reference area

Descriptive name for geographic area

Location of station in reference to the channel to distinguish between stations accessed by vessel (mid-channel) or vehicle (shore-based)

North latitude coordinate of the station.

West longitude coordinate of the station

The status (active or inactive) of the station as of December 2022

First date of collection for the station

Last date of collection for the station

Indication if the station was not sampled for a period of time

Storage Type:

string

float

string

Measurement Type:

nominal

ratio

nominal

Measurement Values Domain:

Definition

text

Definition

text

Definition

text

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	Mid-channel
Definition	mid-channel station
Source

Code Definition

Code	Shore-based
Definition	shore-based station
Source

Unit	decimalDegree
Type	real

Unit	decimalDegree
Type	real

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	Active
Definition	active station
Source

Code Definition

Code	Inactive
Definition	inactive station
Source

Definition

text

Definition

text

Allowed Values and Definitions

Enumerated Domain

Code Definition

Code	FALSE
Definition	station was never paused at some point
Source

Code Definition

Code	TRUE
Definition	station was paused at some point
Source

Missing Value Code:

Code	NA
Expl	NA

Code	NA
Expl	NA

Code	NA
Expl	NA

Code	NA
Expl	NA

Accuracy Report:

Accuracy Assessment:

Coverage:

Methods:

Data Table


Data:	https://pasta-s.lternet.edu/package/data/eml/edi/458/13/afc5b55a61e9a16d29fcaef4d802f5be
Name:	EMP_DWQ_FlagCodes
Description:	A list of quality assurance codes corresponding to the “flags” column in the main data table.
Number of Records:	5
Number of Columns:	2

Table Structure

Object Name:

EMP_DWQ_FlagCodes.csv

Size:

183 byte

Authentication:

8c9e7d5fb5bc69585d6065d9b577235c Calculated By MD5

Text Format:

Number of Header Lines:

Record Delimiter:

\r\n

Orientation:

column

Simple Delimited:

Field Delimiter:	,
Quote Character:	"

Table Column Descriptions

Flag Code

Description

Column Name:

Flag Code

Description

Definition:

QC code corresponding to “flags” column in the main data table

A description of the flag code

Storage Type:

string

Measurement Type:

nominal

Measurement Values Domain:

Definition

text

Definition

text

Missing Value Code:

Accuracy Report:

Accuracy Assessment:

Coverage:

Methods:

Non-Categorized Data Resource

Name:

EMP_DWQ_metadata_methods

Entity Type:

pdf

Description:

Tables describing field and lab methods

Physical Structure Description:

Object Name:

EMP_DWQ_metadata_methods.pdf

Size:

135720 byte

Authentication:

63adb45e6fe294a27eaa93208182a7bf Calculated By MD5

Externally Defined Format:

Format Name:

application/pdf

Data:

https://pasta-s.lternet.edu/package/data/eml/edi/458/13/b399c042c893809547dc196a762b929f

Data Package Usage Rights

This information is released under the Creative Commons license - Attribution - CC BY (https://creativecommons.org/licenses/by/4.0/). The consumer of these data ("Data User" herein) is required to cite it appropriately in any publication that results from its use. The Data User should realize that these data may be actively used by others for ongoing research and that coordination may be necessary to prevent duplicate publication. The Data User is urged to contact the authors of these data if any questions about methodology or results occur. Where appropriate, the Data User is encouraged to consider collaboration or co-authorship with the authors. The Data User should realize that misinterpretation of data may occur if used out of context of the original study. While substantial efforts are made to ensure the accuracy of data and associated documentation, complete accuracy of data sets cannot be guaranteed. All data are made available "as is." The Data User should be aware, however, that data are updated periodically and it is the responsibility of the Data User to check for new versions of the data. The data authors and the repository where these data were obtained shall not be liable for damages resulting from any use or misinterpretation of the data. Thank you.

Keywords

By Thesaurus:

(No thesaurus)

California Department of Water Resources, Interagency Ecological Program for the San Francisco Bay Delta Estuary, San Francisco Estuary, Sacramento-San Joaquin Delta

LTER Controlled Vocabulary

ammonia, algae, carbon, calcium, chloride, chlorophyll, chlorophyll a, conductivity, depth, dissolved nutrients, dissolved organic carbon, dissolved organic nitrogen, dissolved oxygen, estuaries, fluorescence, freshwater, latitude, longitude, long term monitoring, measurements, monitoring, nitrogen, nitrate, nitrite, nutrients, organic carbon, organic nitrogen, oxygen, ph, phaeophytin, phosphorus, rivers, secchi depth, silica, temperature, total organic carbon, total phosphorus, turbidity, water quality, water temperature, wind speed

Methods and Protocols

These methods, instrumentation and/or protocols apply to all data in this dataset:

Methods and protocols used in the collection of this data package

Description:

Data Collection Methods: Station frequency and type: Discrete water quality monitoring stations were created in compliance with Water Right Decision D-1379 and are now mandated by Water Right Decision D-1641. Discrete water quality sampling occurs once a month at each monitoring station. From 1975 to 1994, however, sampling occurred twice a month, typically on a seasonal basis starting in Spring and ending in Fall. Stations that are accessed by research vessel (e.g., boat) are referred to as “mid-channel stations” and those that are accessed by vehicle (e.g., truck or van) are referred to as “shore-based stations”. Field data: The EMP collects both surface and bottom discrete water quality field measurements during high slack tide using a multiparameter instrument (see methods table for models used for the duration of the sampling period). Surface measurements are collected one meter below the surface of the water and bottom measurements are collected one meter above the bottom of the channel. At each mid-channel station, the multiparameter instrument is placed over the side of the research vessel and lowered into the water using a winch crane. The instrument is directly connected to an onboard computer by a 30-meter cable. Once the instrument is equilibrated to the local conditions, the surface and bottom water quality measurements are recorded onto field data sheets, then the instrument is returned onboard the vessel. At shore-based stations, the multiparameter instrument is either placed directly in the water or into a bucket filled with water collected at the station. The surface and bottom water quality measurements are then recorded onto field data sheets once the instrument is equilibrated to the local conditions. Light extinction measurements are made by lowering a light meter into the water and recording depth and light measurements to establish a curve of light extinction. The depth at which only 1% of the surface light intensity remains is read from the curve and recorded. A Secchi disk is also used to determine water clarity and light penetration by lowering the disk into the water in a shaded area and recording the measurement when the black and white quadrants of the disk become indistinguishable. Visual observations of both presence and density of the blue-green cyanobacteria, Microcystis aeruginosa, are made at each station and given a qualitative score ranging from 1 (no Microcystis) to 5 (continuous colonies of Microcystis forming mats/scum). Laboratory data: The research vessels used to collect samples from mid-channel stations are equipped with wet laboratories for onboard processing of water samples. Water is collected using a flow-through system whereby it is pumped into the laboratory from a fixed intake located one meter below the water’s surface. For shore-based stations, water is collected either from a Van Dorn water sampler or via a submersible pump. For both mid-channel and shore-based stations, water is collected into a churn splitter and homogenized before being dispensed into sample collection bottles. Samples of dissolved nutrients are filtered using mixed cellulose ester filters (diameter = 47 mm, pore size = 0.45 µm). Samples of chlorophyll a and pheophytin a are collected on a glass fiber filter (diameter = 47 mm, effective pore size = 1.0 µm). Historically, samples of dissolved organic carbon were passed through glass fiber filters (diameter = 47 mm, effective pore size = 1.0 µm) that have been combusted for 1 hour at 450 ºC. Starting in December 2020, the EMP switched to using mixed cellulose ester filters (diameter = 47 mm, pore size = 0.45 µm) to process dissolved organic carbon samples. Entrapment Zone: The EMP began sampling the Entrapment Zone (EZ) stations in 1996 to document the environmental conditions and geographic variability of the low salinity zone. This zone is sampled once a month at two “floating” stations, which represent the upper (upstream) and lower (downstream) boundaries, called EZ2 and EZ6, respectively. Station EZ2 is located where the bottom specific conductance falls within 10% of 2,000 µS/cm and station EZ6 is located where the bottom specific conductance falls within 10% of 6,000 µS/cm. When dry conditions reduce the freshwater flows into the San Francisco Estuary, saline water from the Pacific Ocean intrudes further into the estuary and causes the low salinity zone to travel upstream where it is split by the Sacramento and San Joaquin Rivers. Such conditions create two geographically disparate low salinity zones. Under these conditions, the stations EZ2-SJR and EZ6-SJR are sampled in the San Joaquin River in addition to stations EZ2 and EZ6, which are sampled in the Sacramento River. Vessel use: Sampling typically occurred on research vessels from the California Department of Water Resources or United States Bureau of Reclamation. From DWR, the RV San Carlos (1975-2016) and RV Sentinel (2017-2021) were primarily used. From USBR, RV Compliance and RV Endeavor were utilized when DWR vessels were unavailable. Standard operating procedures for field collection methods are available upon request (email data contact).

Description:

Datasheet: Copies of field data sheets are available upon request. Please email data contact.

Description:

Instruments and Equipment: Field instrumentation: See IEP_EMP_DWQN_metadata_methods.pdf Light extinction: A Whitney LMT-8A Light Meter was used to measure the depth at which sunlight is extinguished to 1% of surface intensity from 1975 – 1986. Secchi: A 20 cm inch diameter plastic disc with alternate black and white quadrants was used to measure water transparency from 1975 – 2021. Microcystis aeruginosa: Microcystis qualitative scores were recorded starting in August 2015. The qualitative score is a visual observation ranging from (1) meaning absent, (2) low-widely scattered colonies, (3) Medium-adjacent colonies, (4) High-contiguous to (5) Very High- concentration of contiguous colonies forming mats/scum. It should be noted that these qualitative scores are considered subjective and may vary based on the individual recording the data. However, standardized visual scoring guides are followed to aid in recording these observations. Notes: Surface and bottom turbidity data collected during the period of record is reported in two different units. Nephelometric Turbidity Units (NTU) were used from January 1975 – December 2018 for shore-based stations and from January 1975 – June 2019 for mid-channel stations. Formazin Nephelometric Units (FNU) were used starting in January 2019 for shore-based stations and July 2019 for mid-channel stations. This change in reporting units is based on recommendations from the instrument manufacturer and has no impact on the raw measurements. Turbidity is split into two columns to account for the different units. Chlorophyll fluorescence data collected from field instrumentation during the period of record is not included in this data set but is available upon request (email data contact).

Description:

Analysis and methods (standard operating procedures): See IEP_EMP_DWQN_metadata_methods.pdf Copies of written standard operating procedures for all laboratory analysis methods are available upon request (email data contact).

Description:

Project History (change in methods and locations): Stations: At the start of the program in 1975, there were 27 discrete water quality monitoring stations sampled monthly. These stations mostly remained unchanged from 1975-1994, though a small number of stations were added or discontinued, while others were replaced by nearby stations. When a station replacement occurred, an “A” was typically added to the end of the old station name to create the new station name (e.g., station C3 was replaced by the nearby station C3A). However, stations D41 and D41A are an exception to this and are two independent locations. At the end of 1995, sampling was discontinued at 11 stations, leaving 15 remaining stations. Beginning in 1996, EMP implemented a revised compliance monitoring program, which combined the water quality, phytoplankton, benthic, and zooplankton samplings programs previously undertaken by DWR/USBR and the California Department of Fish and Wildlife (CDFW) independently. This led to the acquisition of the CDFW stations, which are indicated by the prefix “NZ”. By 2017, the station list had increased to 26 stations sampled monthly, with 13 of those included in the original station list at the start of the program. Most changes made to the station list over the period of record were to either obtain better access, maintain consistency between program elements, and/or to pair discrete water quality data with data from other elements, such as continuous water quality or zooplankton data. Data: In the earlier years of the program, comprehensive nutrient sampling occurred monthly at all stations. This continued until 1995 when six of the 15 stations remaining were reduced to chlorophyll a and pheophytin a sampling only. Starting in 2016, the EMP began reinstating the comprehensive sampling at these chlorophyll a and pheophytin a-only stations. By February 2017, the full suite of water quality analytes was collected at every station. Regarding field data, surface measurements were reported from the start of the program, but it wasn’t until 2017 (January for mid-channel stations and February for shore-based stations) when bottom measurements were reported for the first time. There were a few months during the entire period of record in which no data was collected at any station. This first month that this occurred was in January 1980 from reasons that were undocumented. There was no data collected in April-May 2020 and January-February 2021 due to the COVID-19 pandemic. There are a few instances during the period of record when some stations were sampled, but not all, which was due to unsafe conditions caused by hazardous air quality and the COVID-19 pandemic. From 1975-2021, the following laboratory analytes were added to the sampling list: dissolved ammonia (1979), dissolved chloride (1980), total dissolved solids (1997), total suspended solids (1997), volatile suspended solids (1997), total organic carbon (2011), dissolved organic carbon (2011), dissolved calcium (2011), dissolved bromide (2019), and total alkalinity (2019). From 1975 - 2021, the following laboratory analytes were dropped from the sampling list: total ammonia (1978), total organic nitrogen (1979), and total chloride (1980). From 1975 - 2021, the following field parameters were added to the sampling list: wind direction (1984), field notes (1996), weather observations (1996), GPS coordinates for EZ stations (2004), a rating score for the blue-green algae, Microcystis aeruginosa (2015), and near bottom measurements (2017), dissolved oxygen in percent saturation (2019). From 1975 - 2021, the following field parameters were dropped from the sampling list: 1% light depth (1996) and wind direction (1999). Collection methods: At each discrete monitoring station, the EMP collects water quality and biological (phytoplankton and zooplankton) samples concurrently. At most stations, samples for discrete water quality are collected prior to beginning the zooplankton sampling, which is conducted by towing collection nets upstream from the station at a constant velocity. At four stations—D28A, D26, D8, and D4—water quality samples were historically collected midway through the zooplankton tow. Results of an internal study conducted in March 2016, however, found no significant differences in water quality parameters at the beginning tow and mid-tow locations for these four stations. As a result, all water quality samples are now collected before beginning the zooplankton tow as of June 2016. Dissolved oxygen (DO) was historically measured from a Winkler titration method. As the ease and accuracy of electronic DO sensors increased, the EMP conducted an internal study to assess any potential differences between DO measured by a multiparameter sonde and Winkler titration. No significant differences were found, and the EMP discontinued the use of Winkler titrations in June 2016. DO is now measured solely using a multiparameter sonde. Sample water from shore-based stations was historically collected via a pump system that was permanently installed at each station. During prolonged droughts, however, the EMP determined that this fixed intake produced unreliable data when water levels were low. As a result, the EMP began using a Van Dorn water sampler to collect samples at these stations starting in May 2016. The EMP has been sampling dissolved organic carbon (DOC) since January 2011 and has historically used a 1.0 μm glass fiber filter combusted at 400° Celsius for one hour to process DOC samples. However, the analytical method for DOC sampling requires that the sample be passed through a 0.45 μm filter prior to analysis. As a result, the EMP switched to a 0.45 μm mixed cellulose ester membrane filter for DOC sampling in December 2020. This filter type proved to be a reliable option for departmental water quality sampling in a study done by the DWR Quality Assurance Program, as it did not add or remove analytes in blank samples. A separate internal study conducted in 2018 found that the differences between DOC samples processed with a combusted 1.0 μm glass fiber filter and a 0.45 μm mixed cellulose ester membrane filter were similar to the differences found between replicate samples. This indicates that the historical DOC data collected by the EMP is comparable to the data collected after making the switch to the 0.45 μm filter.

Description:

QA/QC: Data review: Field data sheets are error checked at the end of each sampling run by the water quality field leads. Field data for each run is then entered into CDWR’s Field and Laboratory Management System (FLIMS), where it is housed while the laboratory data is being analyzed. After the laboratory data has been analyzed, it is merged with the field data and uploaded into the Water Data Library. Both field and laboratory data are then exported into an Excel file from the Water Data Library and verified with the field data sheets by the EMP quality assurance lead. To create this data set, annual discrete water quality data files were exported from the CDWR’s Water Data Library (WDL) from 1975-2021 and then merged to create one large data set. The data was then checked for accuracy using the associated field data sheets as a reference. Blank and duplicate data was collected during this period of record, but were removed from this data set, as their primary use is for internal QA/QC checks. This data is available upon request. Data Flagging: Data that does not meet the acceptance criteria for the various QA/QC practices mentioned below are noted in the “Flag” column of the dataset. The corresponding codes and descriptions are specified in “EMP_QAQC_FlagCodes” csv. The flag description column indicates which analyte was affected for a given flag. For example, a blank hit on a chlorophyll a sample would read “1-chla” in the Flag Description column. If there are multiple analytes associated with the same flag (e.g. a blank hit on chlorophyll a and TOC), then the description would be repeated and separated by a comma (“1-chla,1-TOC”). If all analytes are impacted by a flag, then the Flag Column would read “1-All” for that sample. Calibrations: Instruments used to collect and analyze water quality data are calibrated and maintained following the manufacturer’s guidelines. The multiparameter instruments are calibrated with known standards prior to field runs and verified with another calibrated instrument during sampling. After returning from the field, the instruments are checked with the same calibration standards to ensure the instrument held its calibration. Starting in October 2018, the EMP began assigning a drift rating to each sensor on the instrument based on calculations made from the post-field calibration check results. These ratings follow an acceptance criteria developed from the USGS Wagner method to validate the data collected in the field. A sensor receives one of four ratings: “Excellent”, “Good”, “Fair”, or “Poor”. If a sensor receives a “Fair” or “Poor” rating, then it is likely that the sensor experienced some drift since calibration, and therefore all data that was collected with that sensor is flagged. QC samples: The EMP began collecting equipment blanks on every day of the field run starting in January 2018, however, it should be noted that not all laboratory analytes were collected during blank sampling until October 2019. Blank results above the reporting limit indicate possible contamination during collection, processing, transport, or storage operations. Therefore, normal samples collected on the same day as an elevated blank result are flagged in the data set. Concurrent duplicate sampling started in January 2018 to provide precision information on all steps after sample collection. Duplicate precision was determined using a modified version of Bland and Altman (1986) that accounted for heteroscedasticity and extreme outliers. Currently this method is only applied to chlorophyll and pheophytin results. If a duplicate pair was outside the 99.9% confidence interval, it was flagged as an outlier. Details of this method will be available in Perry and Perry (in prep). Email data contact for more information. Conversions: All conversions made to the data set are for the purpose of maintaining consistency and assessing long-term trends. Historically, the EMP used to collect air temperature in degrees Celsius, which was converted to degrees Fahrenheit to be consistent with air temperature data collected in recent years. Additionally, since samples were analyzed by a different laboratory for a six-month period (October 2019 - March 2020), some of those results required conversions to be cohesive with the historical data set. Specifically, dissolved calcium and dissolved silica results were reported in µg/L from January-March 2020 but were converted to mg/L to match the rest of the data set.

Description:

Contractor Information: All water quality sampling was conducted by staff from IEP’s Environmental Monitoring Program (EMP) primarily from the California Department of Water Resources and the United States Bureau of Reclamation with assistance from the California Department of Fish and Wildlife.

Description:

External Review Process: An IEP Project Work Team reviewed the EMP’s sampling procedures during 2001-2002 and a summary report and recommendations was created in 2003.

People and Organizations

Publishers:

Organization:

Environmental Data Initiative

Email Address:

info@edirepository.org

Web Address:

https://edirepository.org

Id:

https://ror.org/0330j0z60

Creators:

Individual:

Morgan Battey

Organization:

California Department of Water Resources

Position:

Environmental Scientist

Email Address:

morgan.battey@water.ca.gov

Individual:

Sarah Perry

Organization:

California Department of Water Resources

Position:

Environmental Scientist

Email Address:

sarah.perry@water.ca.gov

Id:

https://orcid.org/0000-0002-3708-6675

Contacts:

Individual:

Morgan Battey

Organization:

California Department of Water Resources

Position:

Environmental Scientist

Email Address:

morgan.battey@water.ca.gov

Associated Parties:

Individual:

Theodore M Flynn

Organization:

California Department of Water Resources

Email Address:

theodore.flynn@water.ca.gov

Id:

https://orcid.org/0000-0002-1838-8942

Role:

supervisor

Individual:

Sarah Lesmeister

Organization:

Sacramento-San Joaquin Delta Conservancy

Email Address:

sarah.lesmeister@deltaconservancy.ca.gov

Id:

https://orcid.org/0000-0001-5492-1188

Role:

supervisor

Individual:

Shaun Philippart

Organization:

California Department of Water Resources

Email Address:

shaun.philippart@water.ca.gov

Role:

supervisor

Individual:	Eric Santos
Organization:	California Department of Water Resources
Role:	captain

Individual:

Nicholas Van Ark

Organization:

California Department of Water Resources

Email Address:

nicolas.vanark@water.ca.gov

Role:

captain

Individual:	Nicholas Sakata
Organization:	US Bureau of Reclaimation
Position:	captain
Role:	captain

Individual:

Juliana Manning

Organization:

California Department of Water Resources

Email Address:

julianna.manning@water.ca.gov

Role:

lead

Individual:

Jenna Rinde

Organization:

California Department of Fish and Wildlife

Email Address:

jenna.rinde@wildlife.ca.gov

Id:

https://orcid.org/0000-0001-6677-4701

Role:

lead

Individual:

Nick Rasmussen

Organization:

California Department of Water Resources

Email Address:

nicholas.rasmussen@water.ca.gov

Role:

lead

Individual:

Brianne Noble-Sakata

Organization:

California Department of Water Resources

Email Address:

brianne.sakata@water.ca.gov

Role:

lead

Individual:

Laurel Richardson

Organization:

California Department of Water Resources

Email Address:

laurel.richardson@water.ca.gov

Role:

field crew

Individual:

Dennis Finger

Organization:

California Department of Water Resources

Email Address:

dennis.finger@water.ca.gov

Role:

field crew

Individual:	Caitlin Miller
Organization:	California Department of Water Resources
Role:	field crew

Individual:

Scott Waller

Organization:

California Department of Water Resources

Email Address:

scott.waller@water.ca.gov

Role:

field crew

Individual:

Nelson Michelle

Organization:

California Department of Water Resources

Email Address:

michelle.nelson@water.ca.gov

Role:

field crew

Individual:

Andrew Tran

Organization:

California Department of Water Resources

Email Address:

andrew.tran@water.ca.gov

Role:

field crew

Individual:

Torianne Cahoon

Position:

California Department of Water Resources

Email Address:

torianne.cahoon@water.ca.gov

Role:

field crew

Individual:	Brian Arena
Organization:	California Department of Water Resources
Role:	field crew

Individual:	Brooke Watkins
Organization:	California Department of Water Resources
Role:	field crew

Individual:	Interagency Ecological Program
Role:	overall guidance

Temporal, Geographic and Taxonomic Coverage

Temporal, Geographic and/or Taxonomic information that applies to all data in this dataset:

Time Period

Begin:

1975-01-07

End:

2021-12-16

Geographic Region:

Description:

From the western boundaries of San Pablo Bay to the eastern boundaries of the Sacramento-San Joaquin Delta

Bounding Coordinates:

Northern:	38.369	Southern:	37.678
Western:	-122.393	Eastern:	-121.262

Project

Parent Project Information:

Title:

Interagency Ecological Program

Personnel:

Individual:

Sarah Perry

Organization:

California Department of Water Resources

Position:

Environmental Scientist

Email Address:

Sarah.Perry@water.ca.gov

Id:

https://orcid.org/0000-0002-3708-6675

Role:

Environmental Scientist

Abstract:

Discrete water quality monitoring in the Sacramento-San Joaquin Bay-Delta, collected by the Environmental Monitoring Program, data from 1975-2022

Maintenance

Maintenance:

Description:	Ongoing: Updates to these data are expected
Frequency:	annually

Other Metadata

Additional Metadata

additionalMetadata
        |___text '\n      '
        |___element 'metadata'
        |     |___text '\n         '
        |     |___element 'unitList' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:unitList')
        |     |     |___text '\n            '
        |     |     |___element 'unit' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:unit')
        |     |     |     |  \___attribute 'id' = 'decimalDegree'
        |     |     |     |  \___attribute 'name' = 'decimalDegree'
        |     |     |     |___text '\n               '
        |     |     |     |___element 'description' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:description')
        |     |     |     |___text '\n            '
        |     |     |___text '\n            '
        |     |     |___element 'unit' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:unit')
        |     |     |     |  \___attribute 'id' = 'unitless'
        |     |     |     |  \___attribute 'name' = 'unitless'
        |     |     |     |___text '\n               '
        |     |     |     |___element 'description' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:description')
        |     |     |     |___text '\n            '
        |     |     |___text '\n            '
        |     |     |___element 'unit' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:unit')
        |     |     |     |  \___attribute 'id' = 'percentSaturation'
        |     |     |     |  \___attribute 'name' = 'percentSaturation'
        |     |     |     |___text '\n               '
        |     |     |     |___element 'description' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:description')
        |     |     |     |___text '\n            '
        |     |     |___text '\n            '
        |     |     |___element 'unit' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:unit')
        |     |     |     |  \___attribute 'id' = 'microSeimenPerCentimeter'
        |     |     |     |  \___attribute 'name' = 'microSeimenPerCentimeter'
        |     |     |     |___text '\n               '
        |     |     |     |___element 'description' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:description')
        |     |     |     |___text '\n            '
        |     |     |___text '\n            '
        |     |     |___element 'unit' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:unit')
        |     |     |     |  \___attribute 'id' = 'FormazinNephelometricUnit'
        |     |     |     |  \___attribute 'name' = 'FormazinNephelometricUnit'
        |     |     |     |___text '\n               '
        |     |     |     |___element 'description' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:description')
        |     |     |     |___text '\n            '
        |     |     |___text '\n            '
        |     |     |___element 'unit' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:unit')
        |     |     |     |  \___attribute 'id' = 'microgramPerLiter'
        |     |     |     |  \___attribute 'name' = 'microgramPerLiter'
        |     |     |     |___text '\n               '
        |     |     |     |___element 'description' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:description')
        |     |     |     |___text '\n            '
        |     |     |___text '\n            '
        |     |     |___element 'unit' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:unit')
        |     |     |     |  \___attribute 'id' = 'milligramPerLiterAsCalciumCarbonate'
        |     |     |     |  \___attribute 'name' = 'milligramPerLiterAsCalciumCarbonate'
        |     |     |     |___text '\n               '
        |     |     |     |___element 'description' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:description')
        |     |     |     |___text '\n            '
        |     |     |___text '\n            '
        |     |     |___element 'unit' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:unit')
        |     |     |     |  \___attribute 'id' = 'milligramPerLiterAsNitrogen'
        |     |     |     |  \___attribute 'name' = 'milligramPerLiterAsNitrogen'
        |     |     |     |___text '\n               '
        |     |     |     |___element 'description' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:description')
        |     |     |     |___text '\n            '
        |     |     |___text '\n            '
        |     |     |___element 'unit' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:unit')
        |     |     |     |  \___attribute 'id' = 'milligramPerLiter'
        |     |     |     |  \___attribute 'name' = 'milligramPerLiter'
        |     |     |     |___text '\n               '
        |     |     |     |___element 'description' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:description')
        |     |     |     |___text '\n            '
        |     |     |___text '\n            '
        |     |     |___element 'unit' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:unit')
        |     |     |     |  \___attribute 'id' = 'millgramPerLiter'
        |     |     |     |  \___attribute 'name' = 'millgramPerLiter'
        |     |     |     |___text '\n               '
        |     |     |     |___element 'description' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:description')
        |     |     |     |___text '\n            '
        |     |     |___text '\n            '
        |     |     |___element 'unit' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:unit')
        |     |     |     |  \___attribute 'id' = 'milligramPerLiterAsPhosphorus'
        |     |     |     |  \___attribute 'name' = 'milligramPerLiterAsPhosphorus'
        |     |     |     |___text '\n               '
        |     |     |     |___element 'description' in ns 'http://www.xml-cml.org/schema/stmml-1.2' ('stmml:description')
        |     |     |     |___text '\n            '
        |     |     |___text '\n         '
        |     |___text '\n      '
        |___text '\n   '

Additional Metadata

additionalMetadata
        |___text '\n      '
        |___element 'metadata'
        |     |___text '\n         '
        |     |___element 'emlEditor'
        |     |        \___attribute 'app' = 'ezEML'
        |     |        \___attribute 'release' = '2024.07.17'
        |     |___text '\n      '
        |___text '\n   '

Copyright 2025 Environmental Data Initiative. This material is based upon work supported by the National Science Foundation under grants #2223103 and #2223104. Any opinions, findings, conclusions, or recommendations expressed in the material are those of the author(s) and do not necessarily reflect the views of the National Science Foundation. Please contact us with questions, comments, or for technical assistance regarding this web site or the Environmental Data Initiative. Please read our privacy policy to know what information we collect about you and to understand your privacy rights.

EDI is a collaboration between the University of New Mexico and the University of Wisconsin – Madison, Center for Limnology:

Data Package Metadata View Summary

Interagency Ecological Program: Discrete water quality monitoring in the Sacramento-San Joaquin Bay-Delta, collected by the Environmental Monitoring Program, 1975-2023

Data Entities

Data Table

Data Table

Data Table

Non-Categorized Data Resource

Data Package Usage Rights

Keywords

Methods and Protocols

These methods, instrumentation and/or protocols apply to all data in this dataset:

People and Organizations

Temporal, Geographic and Taxonomic Coverage

Project

Parent Project Information:

Maintenance

Additional Metadata

Additional Metadata

Recently Added

Recently Updated

Data Package Metadata View Summary

Interagency Ecological Program: Discrete water quality monitoring in the Sacramento-San Joaquin Bay-Delta, collected by the Environmental Monitoring Program, 1975-2023

+/- Data Entities

Data Table

Data Table

Data Table

Non-Categorized Data Resource

+/- Data Package Usage Rights

+/- Keywords

+/- Methods and Protocols

These methods, instrumentation and/or protocols apply to all data in this dataset:

+/- People and Organizations

+/- Temporal, Geographic and Taxonomic Coverage

+/- Project

Parent Project Information:

+/- Maintenance

+/- Additional Metadata

+/- Additional Metadata

Data Entities

Data Package Usage Rights

Keywords

Methods and Protocols

People and Organizations

Temporal, Geographic and Taxonomic Coverage

Project

Maintenance

Additional Metadata

Additional Metadata