Pecks Creek IA 01-TRK-168
mouth (S1 T91N R3W Clayton Co.) to south line of S15 T91N R3W Clayton Co.
- Cycle
- 2024
- Release Status
- Final
- Overall IR
- 5 - Water is impaired or threatened and a TMDL is needed.
- Trend
- Unknown
- Created
- 11/1/2023 8:12:31 AM
- Updated
- 12/13/2023 10:14:35 AM
The presumptive Class A1 use was assessed as “not supported” due to levels of indicator bacteria (E. coli) that violated state water quality criteria. The Class A2 use was assessed as “fully supported” based on the same indicator bacteria monitoring data. The Class BCW1 use was assessed as “not supported” based on biological sampling data. All other designated uses were "not assessed."
Data
Sources: Data Source Data Source ID Data Type Data Age Site ID Site Name Site Description Iowa DNR 6 WQ CY 2012-2014 11220012 Peck Creek near Osterdock Site 326 Iowa DNR 6 BIO See Below 570 Peck Creek Osterdock (PeCr2) Iowa DNR 6 BIO See Below 861 Peck Creek Osterdock (PeCr3) Presumptive
Class A1 - Indicator Bacteria: Site ID Data Source ID # Samples / # Years 2012 Geomean 2013 Geomean 2014 Geomean Annual Geomean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 11220012 6 23 / 3 500 148 164 Yes 10 43% Yes Evaluated Not Site ID Data Source ID # Samples / # Years 2012 Geomean 2013 Geomean 2014 Geomean Annual Geomean Violation # Violations % Violations Significantly >10% Violations Assessment Type Support Level 11220012 6 23 / 3 500 148 164 No 2 9% No Evaluated Full Class
A - pH: Site ID Data Source ID # Samples / # Years Maximum Value Mean Value Median Value # Violations % Violations Significantly >10% Violations Assessment Type Support Level 11220012 6 14 / 2 8.9 8.43 8.4 No 0 No Evaluated Full Site ID Data Source ID Parameter Name # Samples / # Years Maximum Value Mean Value Median Value # Acute / Chronic Violations % Acute/ Chronic Violations Significantly >10% Violations Assessment Type Support Level 11220012 6 Ammonia 15 / 2 0.21 0.07 0.05 0 / 0 0% / 0% No Evaluated Full 11220012 6 Chloride 14 / 2 33 32.43 33 0 / 0 0% / 0% No Evaluated Full 11220012 6 Dissolved Oxygen 22 / 3 12 8.9 9 NA / 2 NA / 9% No Evaluated Full 11220012 6 pH 22 / 3 9 8.37 9.36 0 / NA 0% / NA No Evaluated Full 11220012 19 Temperature 23 / 3 21.1 14.8 16.3 0 / 2 0% / 9% No Evaluated Full Benthic
Macroinvertebrates: BioNet Site ID Date Drainage Area (mi2) Ecoregion Major Drainage/Thermal BM Sample Gear CBI score CBI Class CBI BIT CBI Pass/ Fail 861 9/7/11 10 52b MS/CW Hess 49 NA 60 Fail 570 9/6/11 10 52b MS/CW Hess 47 NA 60 Fail 861 7/26/11 9 52b MS/CW Hess 45 NA 60 Fail 570 7/25/11 9 52b MS/CW Hess 44 NA 60 Fail Community Assessment Type Assessment Result Support Level IR Category Reason Benthic Macroinvertebrates Evaluated Fail (0/4) Not 5bt Assessment was evaluated because the
samples were collected in single year and not collected in the last five
years. Class BCW1: Continuous Monitoring
The continuous dissolved oxygen (DO) and temperature
monitoring at two stream locations in 2011 for the DNR/SHL coldwater stream
sampling project do suggest impairment of Class BCW1 aquatic life uses. The
lowest DO concentration recorded in 48 days of continuous monitoring was 5.5
mg/L. The daily DO minimum concentration failed to meet the 24-hour DO
criterion (5 mg/L) in 0 of 48 days. The percentage exceeding (0%) was less than
(passing) the 10% impairment threshold used to assess Binomial water
quality parameters. The associated statistical analysis confidence level was
high (>90%). In contrast, the 16-hour DO criterion (7 mg/L) was exceeded in
22 of 48 days. The percentage exceeding (46%) was greater than (failing) the
10% threshold with high statistical confidence (>90%). The maximum stream
temperature recorded during the sensor deployment period was 28.3 degrees (C).
The BCW1 temperature criterion of 20 (C) was exceeded in 36 of 48 days. The
percentage exceeding (75%) was greater than (failing) the 10% impairment
threshold with high statistical confidence (>90%). Based on these data, the
BCW1 aquatic life use was assessed as "WINOFI" due to DO and temperature. The
assessment type is “evaluated” because it is based on data collected from a
single year within the current data assessment period. In order to meet the requirements
for a “monitored” assessment, the DNR’s continuous monitoring assessment
methodology requires monitoring data from two or more years within the
assessment period.
Class A2 - Indicator Bacteria:
Class BCW1 - Binomial Parameters:
Class BCW1 - Biological Sampling:
Overall Assessment: