Small-scale retrospective ground water monitoring study for simazine in different hydrogeological settings
- Roux Associates, Inc., Huntington, NY (United States)
- CIBA-GEIGY, Greensboro, NC (United States)
A ground water monitoring study was conducted for the triazine herbicide simazine at 11 sites in the US. The study used carefully selected, small-scale sites (average size: about 33 acres) with documented product use and sensitive hydrogeological settings. The sites selected were Tulare County, California (two sites); Fresno County, California; Sussex County, Delaware; Hardee and Palm Beach counties, Florida; Winnebago County, Illinois; Jackson County, Indiana; Van Buren and Berrien counties, Michigan; and Jefferson County, West Virginia. These sites satisfied the following criteria: a history of simazine use, including the year prior to the start of the study; permeable soil and vadose zone; shallow depth to water; no restrictive soil layers above the water table; and gentle slopes not exceeding 2%. A variety of crop types, climates, and irrigation practices were included. The results of the study showed that out of 153 samples analyzed, 45 samples showed simazine detections. A substantial majority of the detections (32 out of 45) occurred in Tulare, Fresno, and Jefferson counties. The detections in these areas were attributed to mechanisms other than leaching, such as drainage wells, karst areas, surface water recharge, or point source problems. An additional 11 detections in Van Buren County were apparently due to an unknown upgradient source. Only one detection near the screening level of 0.1 ppb was attributed to possible leaching. The results of this investigation support the hypothesis that simazine does not leach significantly under field use conditions.
- OSTI ID:
- 5893144
- Journal Information:
- Ground Water Monitoring Review; (United States), Vol. 11:3; ISSN 0277-1926
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
GROUND WATER
MONITORING
WATER POLLUTION
HERBICIDES
ECOLOGICAL CONCENTRATION
ENVIRONMENTAL TRANSPORT
CALIFORNIA
DELAWARE
FLORIDA
ILLINOIS
INDIANA
LEACHATES
LEACHING
MICHIGAN
WEST VIRGINIA
DEVELOPED COUNTRIES
DISPERSIONS
DISSOLUTION
FEDERAL REGION III
FEDERAL REGION IV
FEDERAL REGION V
HYDROGEN COMPOUNDS
MASS TRANSFER
MIXTURES
NORTH AMERICA
OXYGEN COMPOUNDS
PESTICIDES
POLLUTION
SEPARATION PROCESSES
SOLUTIONS
USA
WATER
540220* - Environment
Terrestrial- Chemicals Monitoring & Transport- (1990-)