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Data Series 285

Data Series 285 (ver 1.1, August 2018)

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Abbreviations and Acronyms

(Clarification or additional information given in parentheses)

CAS Chemical Abstracts Service (American Chemical Society)
CFC-12 dichlorodifluoromethane
CSU combined standard uncertainty
DBCP 1,2-dibromo-3-chloropropane
DD depth dependent
DO dissolved oxygen
DOC dissolved organic carbon
FP flowpath
GAMA Ground-Water Ambient Monitoring and Assessment (State Water Board)
GC/MS gas chromatography/mass spectrometry
GIS geographic information system
HA-L lifetime health advisory (USEPA)
ICP-MS inductively coupled plasma mass spectrometry
ID identification
LRL laboratory reporting level
LT-MDL long-term method detection level
MCL Maximum Contaminant Level (CADHS and USEPA)
MDL method detection limit
MRL Minimum Reporting Level
MU method uncertainty
NAM North American (study area)
NAWQA National Water Quality Assessment (USGS)
NDMA N-Nitrosodimethylamine
NL notification level (CADHS)
NRP National Research Program (USGS)
NWIS National Water Information System (USGS)
PCE tetrachloroethylene
QC quality control
QPC Uplands (Quaternary Pleistocene semiconsolidated deposits; study area)
RSD relative standard deviation
RSD5 risk-specific dose at a cancer risk level of 1 in 100,000 or 10E–5 (USEPA)
SAM South American (study area)
SC specific conductance
SMCL Secondary Maximum Contaminant Level (CA and USEPA)
SOL Solano (study area)
SSMDC sample-specific minimum detectable concentration
SUI Suisun–Fairfield (study area)
TCE trichloroethylene
1,2,3-TCP 1,2,3-trichloropropane
TDS total dissolved solids
THM trihalomethane
TIOC tentatively identified organic compound
UV-VIS ultraviolet-visible
VOC volatile organic compound
YOL Yolo (study area)
CADHS California Department of Health Services
(as of July 1, 2007, name changed to
California Department of Public Health)
CADWR California Department of Water Resources
CWSC California Water Science Center (USGS)
LLNL Lawrence Livermore National Laboratory
NIST National Institute of Standards and Technology
NWQL National Water Quality Laboratory (USGS)
RSIL Reston Stable Isotope Laboratory (USGS)
USEPA U.S. Environmental Protection Agency
USGS U.S. Geological Survey
Units of Measurement
ft foot (feet)
in. inch
kg kilogram (103 grams)
km2 square kilometer
lb pound
L liter
mg milligram (10–3 gram)
mg/L milligram per liter (10–3 grams per liter)
mi2 square miles
mL milliliter (10–3 liter)
µg/L microgram per liter (10–6 grams per liter)
µL microliter (10–6 liter)
µm micrometer (10–6 meter)
pCi/L picocurie per liter
pCi/µg picocurie per microgram

Note: In this report, the California State Water Resources Control Board is referred to in its abbreviated form as the “State Water Board.” The initialism “SWB” is not used in the text.


Temperature in degrees Celsius (°C) may be converted to degrees Fahrenheit (°F) as follows:

°F = (1.8 × °C) + 32

Vertical coordinate information is referenced to the North American Vertical Datum of 1988 (NAVD 88).

Horizontal coordinate information is referenced to the North American Datum of 1983 (NAD 83).

Altitude, as used in this report, refers to distance above the vertical datum.

Specific conductance is given in microsiemens per centimeter at 25 degrees Celsius (µS/cm at 25 °C).

Concentrations of chemical constituents in water were given either in milligrams per liter (mg/L) or micrograms per liter (µg/L). One thousand micrograms per liter is equivalent to 1 milligram per liter. Milligrams per liter is equivalent to parts per million (ppm) and micrograms per liter is equivalent to parts per billion (ppb).

In this report, the USEPA designation for “lifetime health advisory” is “HA-L,” to avoid possible confusion with USEPA’s Health Advisory Level (HAL), which is a nonregulatory health-based reference level of chemical traces (usually in ppm) in drinking water at which there are no adverse health risks when ingested over various periods of time. It is an estimate of acceptable drinking-water concentrations and provides guidance to water-supply managers. HA-L represents the concentration of a chemical in drinking water that is not expected to cause any adverse noncarcinogenic effects for a lifetime of exposure. The HA-L assumes consumption of 2 liters of water per day over a 70-year lifetime by a 70-kilogram (154 pound) adult, and that 20 percent of exposure comes from drinking water. Only the HA-L is used in this report.

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