Iowa DNR
Iowa DNR
ADBNet
Water Quality Assessments
Impaired Waters List

Plainfield Lake IA 02-CED-3061

North of Plainfield

Cycle
2020
Release Status
Final
Overall IR
2 - Some of the designated uses are met but there is insufficient data to determine if remaining designated uses are met.
Trophic
Unknown
Trend
Unknown
Created
9/10/2020 9:10:05 AM
Updated
10/16/2020 8:34:24 AM
Use Support
Class BLW
Aquatic Life - Lakes and wetlands
Not Assessed
Class HH
Human Health -
Fully Supported
General Use
General Use water -
Not Assessed
Impairment Delistings
No delistings for this assessment cycle.
Documentation
Assessment Summary

The Class HH uses are assessed as “fully supported” based on fish tissue monitoring. All other designated uses are “not assessed.”

Assessment Explanation

Sources of Data:

Data Source

Data Source ID

Data Type

Data Age

Site ID

Site Name

Site Description

Iowa DNR

FT

See Below

353

Plainfield Lake

Class BLW – No Data

Class HH - Fish Tissue Sampling:

Site ID

Date

Species Name

Biopart

# in sample

chlordane result

chlordane violation?

PCBs result

PCBs violation?

Hg result

Hg violation?

Assessment Type

Support Level

353

9/15/16

largemouth bass

plug

4

0.095

No

Monitored

Full

353

8/20/15

largemouth bass

plug

5

0.366

Yes

Monitored

Partial

Fish consumption uses were assessed (monitored) as “fully supported” based on results of follow-up fish contaminant monitoring at Plainfield Lake in 2016. The composite samples of fillets from largemouth bass had low levels of contaminants. Levels of primary contaminants in the composite sample of largemouth bass were as follows: mercury: 0.095 ppm.

Monitoring and Methods
Assessment Key Dates
8/20/2015
Fish Tissue Monitoring
9/15/2016
Fish Tissue Monitoring
Methods
260
Fish tissue analysis