Fairfield Reservoir 1 IA 03-SKU-909

Alternate name(s) for this segment: Bonnifield Lake | Fairfield Municipal Reservoir 1

Jefferson County S13&24T72NR10W near Fairfield

This is a Legacy Assessment. Prior to 2004, assessments were developed under a methodology that pre-dated the Integrated Report guidelines.

Assessment Cycle

1996

Result Period

1992 - 1994

Designations

Assessment Type

Monitored

Integrated Report

Category 0

Trophic

Eutrophic

Trend

Stable

Legacy ADBCode

IA 03-SKU-00950-L_0

Overall Use Support

Threatened

Aquatic Life Use Support

Not assessed

Fish Consumption

Not assessed

Drinking Water

Threatened

Documentation

Assessment Comments

Basis for Assessment

Used results of sampling for eight common agricultural herbicides as report in Miller and Kennedy 1995 to assess support of the Class C (drinking water) uses as FST due to (1) low levels of the three herbicdes detected: atrazine, 1.6 ug/l; cyanazine, 2.1 ug/l; and metolachlor 0.1 ug/l and (2) the lack of any MCL violations. Levels of atrazine & cyanazine, however, were approx. twice the average levels in the 19 reservoirs sampled. As stated for the 1994 assessment, other studies (especially Kalkhoff 1993) suggest that levels of atrazine in this reservoir may exceed the MCL during summer. More monitoring is needed.