20030147 Ver 2_2020 Water Compliance Report_20210405

WATER STRATEGY AND HYDRO LICENSING

Duke Energy Corporation
Regulated and Renewable Energy
526 South Church Street / EC12Q
Charlotte, NC 28202

April 5, 2021

The Honorable Kimberly D. Bose, Secretary
Federal Energy Regulatory Commission
888 First Street N.E.
Washington, DC 20426

Re: Duke Energy Progress, LLC
Yadkin-Pee Dee Hydroelectric Project (FERC No. 2206)
2020 Water Quality Compliance Report

Dear Secretary Bose:

Duke Energy Progress, LLC (Duke Energy) was issued a New License by the Federal Energy Regulatory
Commission (FERC) for the Yadkin-Pee Dee Hydroelectric Project (Project, FERC No. 2206) on April 1,
2015. Enclosed is the 2020 Water Quality Compliance Report required annually for the Project by Article
402 of the New License.

Please contact John Crutchfield at [phone] ([e-mail]) if you have
questions or require additional information.

Sincerely,

Jeffrey G. Lineberger, P.E.
Director, Water Strategy and Hydro Licensing
Duke Energy

Enclosure

cc w/enclosure: Paul Wojoski, NCDEQ
Chonticha McDaniel, NCDEQ
Fred Tarver, NCDEQ

cc w/o enclosure: John Crutchfield
Lynne Dunn
David Scott
Phil Fragapane

ii

Yadkin-Pee Dee Hydroelectric Project

FERC Project No. 2206

2020 Water Quality Compliance Report

Duke Energy Progress, LLC

April 2021

iii

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1

Yadkin-Pee Dee Hydroelectric Project
FERC Project No. 2206

2020 Water Quality Compliance Report

1.0 Background

On April 1, 2015, the Federal Energy Regulatory Commission (FERC; Commission) issued Duke Energy
Progress, LLC (Duke Energy) a New License for the Yadkin-Pee Dee Hydroelectric Project (Project,
FERC Project No. 2206). License Article 402 approved Duke Energy’s Dissolved Oxygen Compliance
Implementation Plan (Compliance Plan), filed with FERC on January 20, 2012, to meet the water quality
monitoring requirements outlined in Sections III.A.2 and III.B.2 of the 401 Water Quality Certification
(WQC) issued by the North Carolina Division of Water Resources (DWR).

This report fulfills the annual water quality compliance reporting requirement outlined in the WQC for
monitoring conducted in 2020. The data reported here conform to requirements outlined in the
Compliance Plan, Section 8.0 – Compliance Monitoring and Reporting.

2.0 Compliance Monitoring

As required in the Compliance Plan, the following parameters were measured at 15-minute intervals from
May 1 through November 30, 2020, in the tailwaters of the Tillery and Blewett Falls Developments:

• Dissolved oxygen (DO), mg/L
• Water temperature, oC
• Gage height (river stage), feet

Measurements were carried out by the United States Geological Survey (USGS) as required by Section
7.0 of the Compliance Plan, at the following locations:

Development USGS Station Number USGS Station Description
Tillery 0212378405 Pee Dee River at Highway 731 below Lake
Tillery near Norwood, North Carolina
Blewett Falls 0212880025 Pee Dee River below Powerhouse Dam near Pee
Dee, North Carolina
2

3.0 Compliance Reporting

Results reported here are based on approved data provided to Duke Energy by USGS after their final
quality assurance review, as specified in Section 8.0 of the Compliance Plan. This report and the
associated Excel file provide the following results for data collected May 1 through November 30, 2020:

• DO and water temperature recorded at 15-minute intervals
• Daily minimum, average, and maximum DO values
• Daily minimum, average, and maximum water temperature values

Calculations for percent DO saturation (% saturation) along with DO, water temperature, and gage height
(river stage) data measured at 15-minute intervals at the USGS monitoring locations described above are
reported in the Excel file associated with this report: Yadkin-Pee Dee Project Water Quality Data
2020.xlsx.

Daily minimum, average, and maximum DO concentration and water temperature data are reported in
Table 1 for the Tillery Development and in Table 2 for the Blewett Falls Development. Daily minimum
and average DO values are graphed for the Tillery Development in Figure 1 and for the Blewett Falls
Development in Figure 2. Daily minimum, average, and maximum water temperature values are graphed
in Figure 3 for the Tillery Development and Figure 4 for the Blewett Falls Development.

Data Recovery
Water temperature, DO and gage height were measured at 15-minute intervals, generally resulting in a
total of 96 observations per day. Overall recovery rates for approved continuous DO monitoring data
during the 2020 season were 99.5% for the USGS station at Blewett Falls Development (No.
0212880025) and 99.6% for the USGS station at Tillery Development (No. 0212378405).

For both water quality stations, routine calibration and replacements of the monitoring instrumentation by
USGS field staff typically resulted in no more than one or two missing observations per event.
Additionally, in the other instances of missing observations, the sonde communications with the radio
transmitter was briefly interrupted when transmitting data resulting in a null value recorded (i.e., missing
value). The USGS has upgraded the sonde hardware for the 2021 monitoring season to address this
communication issue. Table 3 documents the dates during the monitoring period when the USGS
performed routine calibration and maintenance of the field instrumentation.
3

3.1 Compliance with Water Quality Standards

The WQC issued by DWR (Appendix A of the New License) specifies that DO concentrations in Project
tailwaters will comply with the applicable North Carolina water quality standards which are as follows
(NCDENR-DWQ 2007):

Standard for instantaneous DO concentration, minimum: 4.0 mg/L
Standard for daily (24-hour) average DO concentration, minimum: 5.0 mg/L

Daily Average DO Standard
During the monitoring period (May 1 - November 30, 2020), the Tillery Development daily average DO
concentrations in the tailwaters remained above the state standard of 5.0 mg/L (Figure 1).

During Hurricane Florence in September 2018, Blewett Falls Hydro Station was flooded, rendering all
units inoperable and out of service. Duke Energy notified the Commission of the impacts of this storm on
October 5 and October 19, 2018, and FERC acknowledged these notifications on October 29, 2018.
Duke Energy notified the Commission again on February 7 and March 1, 2019, of the potential deviations
from license compliance requirements that could occur as a result of inoperable generating units. FERC
acknowledged these notifications on March 20, 2019. An update was also sent to FERC on January 22,
20201 describing the potential impacts of the inoperable units on the 2020 license requirements.
Additional updates were provided to the stakeholders and FERC on May 12, 20202 and September 4,
20203.
In the notification to the Commission, Duke Energy explained that the Blewett Falls Station enhances DO
levels by utilizing vent valves to aerate the flow release while the generating units are operating. Without
operable units, providing hydro unit aeration to meet the DO standard at Blewett Falls is not possible.
Duke Energy also explained that water spilling over the spillway should keep the DO levels above the
standard, but the spillage flow may not reach the DO monitoring equipment in the tailrace. This could

1 Letter to Secretary Bose dated January 22, 2020, RE: Duke Energy Progress, LLC, Yadkin-Pee Dee Hydroelectric
Project No. 2206, License Article 401(c) Notification.
2 Letter to Secretary Bose dated May 12, 2020, RE: Duke Energy Progress, LLC, Yadkin -Pee Dee Hydroelectric
Project No. 2206, License Variance Request and Update on Blewett Falls Development Restoration
Schedule.

3 Letter to Secretary Bose dated September 4, 2020, RE: Duke Energy Progress, LLC, Yadkin-Pee Dee
Hydroelectric Project No. 2206, Update on Blewett Falls Development Restoration Schedule.
4

result in low DO readings if the water in the tailrace is not being mixed with the spillway flow. Without
the generating units, there is no means of enhancing the DO levels in the tailrace. FERC agreed with the
potential for a large number of license deviations with regards to water quality standards and granted
Duke Energy's request to report deviations from the dissolved oxygen standard in the annual water quality
report as opposed to within five days of each deviation as required by the NC WQC or ten days of each
deviation as required by the license.
Units 3-5 were commissioned and placed back into service on October 20, 2020 while Units 1-2 were
commissioned and placed back into service on December 31, 2020; therefore, the units were not available
for DO aeration during most of the compliance monitoring season. Duke Energy notified the
Commission of the status of the start-up dates for the units on October 21, 20204 and again on January 4,
2021.5 Stakeholders were also notified of this start-up schedule via email correspondence. Unit 6 was
placed back into service on April 2, 2021 with similar notifications sent to stakeholders and the
Commission.
During the monitoring period (May 1 - November 30, 2020), the Blewett Falls Development experienced
several days (i.e., 6 days) where the daily average DO concentrations in the tailwaters were below the
state standard of 5.0 mg/L (Figure 2). These deviations occurred in July 2020.

Instantaneous DO Standard
During the 2020 monitoring season, the instantaneous DO concentrations in the tailwaters of the Tillery
Development did not fall below the 4.0 mg/L standard (Figure 1).

At the Blewett Falls Development, there were numerous deviations (i.e., 22 days) from the instantaneous
DO standard for the same reasons as described above. These deviations occurred in the July-August
timeframe (Figure 2).

4.0 References

NCDENR-DWQ. 2007. NCDENR-Division of Water Quality – Redbook. Surface waters and wetlands
standards. North Carolina Administrative Code 15A NCAC 02B.0100, .0200 & .0300. Amended

4 Letter to Secretary Bose dated October 21, 2020, RE: Duke Energy Progress, LLC, Yadkin-Pee Dee Hydroelectric
Project No. 2206, Update on Blewett Falls Development Restoration Schedule.

5 Letter to Secretary Bose, dated January 4, 2021, RE: Duke Energy Progress, LLC, Yadkin -Pee Dee Hydroelectric
Project No. 2206, Update on Blewett Falls Restoration Schedule.
5

effective: May 1, 2007. North Carolina Department of Environment and Natural Resources, Division of
Water Quality, Raleigh, North Carolina. (as cited in Progress Energy Carolinas, Inc. 2012)

Progress Energy Carolinas, Inc. 2012. Yadkin Pee-Dee Hydroelectric Project No. 2206, Tillery and
Blewett Falls Developments, Dissolved Oxygen Compliance Implementation Plan, January 20, 2012.
Progress Energy Carolinas, Inc., Charlotte, North Carolina.
6

Figure 1. Daily average and minimum DO concentrations downstream of the Tillery Development (USGS Station No. 0212378405),
May 1 - November 30, 2020.

7

Figure 2. Daily average, and minimum DO concentrations downstream of the Blewett Falls Development (USGS Station No. 212880025),
May 1 - November 30, 2020.
8

Figure 3. Daily average, minimum, and maximum water temperatures downstream of the Tillery Development (USGS Station No.
0212378405), May 1 - November 30, 2020.

9

Figure 4. Daily average, minimum, and maximum water temperatures downstream of the Blewett Falls Development (USGS Station No.
0212880025), May 1 - November 30, 2020.
10

Table 1. Daily average, minimum, and maximum DO and water temperature downstream
of the Tillery Development (USGS Station No. 0212378405) May 1 - November 30,
2020.

Table 1: Tillery Development
Daily Daily Daily Daily Daily Daily

Avg Temp Min Temp Max Temp Avg DO Min DO Max DO

Date (Deg C) (Deg C) (Deg C) (mg/L) (mg/L) (mg/L) N
5/1/2020 18.5 18.4 18.8 9.4 9.0 9.7 96
5/2/2020 18.1 17.8 18.7 8.8 8.4 9.2 95
5/3/2020 17.9 17.7 18.4 9.3 8.8 10.3 96
5/4/2020 19.2 17.8 23.7 9.5 7.6 11.3 96
5/5/2020 19.0 18.4 21.8 9.2 7.1 11.4 96
5/6/2020 19.6 18.5 22.5 9.4 7.4 11.1 96
5/7/2020 19.4 18.0 22.3 9.3 7.1 11.4 96
5/8/2020 18.8 17.8 19.6 9.0 7.2 11.2 96
5/9/2020 19.1 17.2 21.6 9.4 7.6 11.4 96
5/10/2020 19.0 17.2 22.4 9.1 7.4 11.7 95
5/11/2020 18.8 17.5 21.4 9.3 7.6 11.5 96
5/12/2020 18.9 17.1 21.9 9.3 7.4 11.7 96
5/13/2020 18.5 18.0 19.0 8.5 7.2 9.7 96
5/14/2020 18.6 18.4 19.0 8.7 8.2 9.2 96
5/15/2020 18.9 18.0 22.0 8.6 7.3 11.3 96
5/16/2020 19.2 17.9 23.2 8.8 7.0 11.9 96
5/17/2020 19.6 18.9 22.0 8.8 6.9 11.3 96
5/18/2020 19.8 19.3 21.4 8.6 6.6 10.7 96
5/19/2020 19.5 19.3 20.1 8.6 8.0 9.0 96
5/20/2020 19.6 19.4 19.8 8.6 8.3 8.8 96
5/21/2020 19.3 18.7 19.7 9.5 8.3 10.2 96
5/22/2020 18.2 17.8 18.7 10.2 9.8 10.3 95
5/23/2020 18.6 18.2 18.9 10.0 9.5 10.3 95
5/24/2020 19.0 18.8 19.2 9.5 9.3 9.6 96
5/25/2020 19.1 19.0 19.2 9.3 9.2 9.5 96
5/26/2020 19.1 18.9 19.2 9.2 9.0 9.3 96
5/27/2020 19.0 18.8 19.3 9.2 8.9 9.9 96
5/28/2020 19.2 18.9 19.5 9.7 9.5 10.0 96
5/29/2020 19.2 19.0 19.4 9.8 9.5 10.0 96
5/30/2020 19.4 19.2 19.6 9.7 9.4 9.8 96
5/31/2020 20.0 19.5 21.7 9.3 9.0 9.6 96
6/1/2020 20.1 19.8 20.3 9.0 7.6 9.4 96
6/2/2020 20.2 19.6 22.1 8.8 7.8 9.1 96
6/3/2020 20.3 20.1 20.6 8.6 7.5 8.9 96

11

Table 1: Tillery Development
Daily Daily Daily Daily Daily Daily
Avg Temp Min Temp Max Temp Avg DO Min DO Max DO
Date (Deg C) (Deg C) (Deg C) (mg/L) (mg/L) (mg/L) N
6/4/2020 20.6 20.2 20.9 8.2 7.4 8.7 96
6/5/2020 21.4 20.3 24.6 8.2 7.4 8.8 96
6/6/2020 21.9 21.0 25.9 8.2 7.2 8.9 96
6/7/2020 22.4 21.5 26.1 7.8 6.6 8.9 95
6/8/2020 21.9 21.4 22.8 7.7 6.7 8.6 95
6/9/2020 22.3 21.7 25.1 7.5 6.6 9.0 946
6/10/2020 22.2 21.5 25.9 7.5 6.5 9.5 96
6/11/2020 22.1 21.4 23.6 7.4 6.4 9.1 94
6/12/2020 23.5 22.0 27.4 8.0 6.6 9.1 956
6/13/2020 24.3 22.8 27.3 7.8 6.1 9.3 96
6/14/2020 24.2 22.9 27.7 7.8 6.1 9.3 96
6/15/2020 23.3 22.8 24.0 6.9 5.9 8.8 96
6/16/2020 23.4 22.8 23.7 7.2 6.6 8.2 95
6/17/2020 22.8 22.4 23.1 6.5 6.2 7.6 95
6/18/2020 22.4 22.1 22.6 6.5 6.2 6.9 96
6/19/2020 22.6 22.3 22.9 6.9 6.3 7.5 96
6/20/2020 23.1 22.6 24.4 7.5 7.1 8.1 96
6/21/2020 23.1 22.8 23.4 7.4 7.0 7.9 96
6/22/2020 23.3 23.0 23.6 7.2 6.1 7.8 96
6/23/2020 23.8 23.0 26.4 7.2 6.0 8.8 96
6/24/2020 24.2 23.2 28.2 7.3 6.2 8.9 96
6/25/2020 24.4 23.6 27.2 7.0 5.7 9.1 96
6/26/2020 24.3 23.5 28.2 7.2 6.3 9.0 96
6/27/2020 24.8 23.8 27.7 7.6 6.0 9.1 95
6/28/2020 24.8 23.9 28.4 6.9 5.6 9.0 95
6/29/2020 24.8 24.2 25.5 6.9 5.4 7.9 92
6/30/2020 25.6 24.6 27.9 6.8 5.1 8.9 96
7/1/2020 26.1 24.5 29.2 6.9 5.5 9.2 96
7/2/2020 25.9 24.4 29.9 6.8 5.2 9.1 95
7/3/2020 26.4 24.9 30.2 6.8 5.3 8.9 95
7/4/2020 26.5 25.0 29.9 7.1 5.5 9.2 95
7/5/2020 25.9 24.6 29.9 6.4 5.4 9.2 96
7/6/2020 25.7 24.4 29.1 6.6 5.3 9.4 95
7/7/2020 25.3 24.7 26.6 6.6 5.7 8.9 96
7/8/2020 26.3 25.3 29.1 6.7 5.5 9.0 96
7/9/2020 26.8 25.6 29.3 6.6 5.2 8.7 96
7/10/2020 26.3 25.1 29.6 6.3 5.2 8.4 96
7/11/2020 27.1 25.8 30.5 7.1 5.6 8.6 96

6 Temperature had only one missing observation on 6/9/2020 while DO had only one missing value on 6/12/2020.
12

Table 1: Tillery Development
Daily Daily Daily Daily Daily Daily
Avg Temp Min Temp Max Temp Avg DO Min DO Max DO
Date (Deg C) (Deg C) (Deg C) (mg/L) (mg/L) (mg/L) N
7/12/2020 26.8 25.6 30.6 6.4 5.4 8.4 96
7/13/2020 26.4 25.5 29.5 6.1 5.3 8.3 96
7/14/2020 26.6 25.7 30.4 5.9 5.1 8.2 96
7/15/2020 26.7 25.8 30.6 5.8 5.0 8.2 96
7/16/2020 26.8 25.7 30.0 6.1 5.1 8.4 96
7/17/2020 26.7 25.8 30.3 6.4 5.1 8.8 94
7/18/2020 27.0 26.3 29.9 6.5 5.0 8.6 95
7/19/2020 27.4 26.5 31.2 6.1 5.4 8.2 95
7/20/2020 27.6 26.5 31.7 6.0 4.4 8.3 95
7/21/2020 27.7 26.5 31.4 6.1 4.7 8.4 95
7/22/2020 27.2 26.8 30.4 5.9 5.2 8.2 95
7/23/2020 27.9 26.9 30.6 6.0 4.9 8.1 95
7/24/2020 28.3 27.0 31.9 5.9 4.8 8.3 95
7/25/2020 28.1 27.2 31.8 6.3 5.0 9.3 95
7/26/2020 28.3 27.1 32.0 6.1 4.6 8.3 95
7/27/2020 28.6 27.2 32.0 6.1 5.0 8.1 95
7/28/2020 28.7 27.6 32.1 5.9 4.8 7.9 95
7/29/2020 28.5 27.6 31.8 5.8 4.3 7.9 95
7/30/2020 27.7 27.5 28.1 5.4 4.6 7.0 95
7/31/2020 27.9 27.5 28.3 5.7 4.4 6.7 90
8/1/2020 28.6 27.9 31.5 5.9 4.7 7.6 94
8/2/2020 28.3 27.7 31.0 5.9 4.7 8.1 96
8/3/2020 28.2 27.7 28.6 5.9 5.1 7.5 96
8/4/2020 28.6 28.3 29.1 6.4 5.2 7.0 96
8/5/2020 28.6 28.0 31.7 6.0 5.1 7.8 96
8/6/2020 28.7 28.0 31.5 6.2 5.3 8.0 96
8/7/2020 28.6 28.1 28.9 5.9 5.2 6.7 95
8/8/2020 28.8 28.6 29.0 6.2 5.5 6.8 96
8/9/2020 28.9 28.7 29.3 6.1 5.3 6.9 96
8/10/2020 28.8 28.2 30.7 6.1 5.2 7.8 96
8/11/2020 28.8 28.2 30.8 6.0 5.0 7.7 96
8/12/2020 29.0 28.4 30.9 6.3 5.0 7.6 95
8/13/2020 29.2 28.8 31.2 6.5 5.0 7.5 95
8/14/2020 29.1 28.7 30.5 6.3 5.2 7.4 95
8/15/2020 28.9 28.5 29.1 6.5 5.0 7.4 95
8/16/2020 29.1 28.8 29.2 7.3 6.5 7.8 94
8/17/2020 28.5 28.3 28.8 7.5 6.6 7.9 96
8/18/2020 28.6 28.2 30.8 7.5 7.2 7.9 96
8/19/2020 28.2 27.5 29.4 7.2 5.7 8.1 95
8/20/2020 28.0 27.4 29.2 6.8 5.6 8.0 95
13

Table 1: Tillery Development
Daily Daily Daily Daily Daily Daily
Avg Temp Min Temp Max Temp Avg DO Min DO Max DO
Date (Deg C) (Deg C) (Deg C) (mg/L) (mg/L) (mg/L) N
8/21/2020 27.9 27.5 28.0 6.8 5.6 7.7 95
8/22/2020 27.8 27.7 27.9 7.1 6.7 7.3 95
8/23/2020 27.5 27.1 27.8 6.4 5.8 7.6 95
8/24/2020 27.5 27.4 27.6 6.6 6.4 6.9 96
8/25/2020 27.6 27.1 28.7 7.0 5.9 7.9 96
8/26/2020 27.4 27.0 27.7 6.9 5.6 7.8 95
8/27/2020 27.3 27.0 27.4 6.6 5.5 7.5 96
8/28/2020 27.2 27.0 27.4 6.3 5.5 7.4 95
8/29/2020 27.3 26.9 29.1 6.7 5.7 8.2 95
8/30/2020 27.3 26.8 27.6 6.4 5.3 7.4 95
8/31/2020 27.2 27.1 27.4 6.0 5.2 7.2 95
9/1/2020 27.4 27.1 29.5 6.3 5.3 8.1 96
9/2/2020 27.8 27.0 31.1 6.6 5.3 7.9 96
9/3/2020 27.6 27.0 30.9 6.2 5.2 8.0 96
9/4/2020 27.8 27.1 31.0 6.4 5.2 8.2 95
9/5/2020 28.0 27.4 30.2 6.7 5.3 8.5 96
9/6/2020 28.1 27.0 30.6 7.1 6.0 8.7 96
9/7/2020 27.8 26.1 30.5 6.6 5.5 9.1 96
9/8/2020 27.4 25.9 29.8 6.8 5.5 9.6 96
9/9/2020 27.1 26.9 27.4 6.5 5.5 8.1 95
9/10/2020 27.2 27.0 27.6 7.1 5.6 8.6 96
9/11/2020 27.1 26.7 27.7 6.4 5.5 7.4 96
9/12/2020 27.0 26.8 27.7 6.5 5.3 8.6 96
9/13/2020 27.4 26.2 30.3 7.5 5.8 9.4 96
9/14/2020 27.1 26.5 27.7 6.9 5.4 8.5 96
9/15/2020 26.8 26.0 27.3 7.2 5.5 8.7 95
9/16/2020 26.8 26.7 26.9 6.9 6.4 7.5 95
9/17/2020 26.5 25.8 26.8 6.6 6.0 7.7 96
9/18/2020 26.1 25.6 26.8 6.9 6.2 8.4 95
9/19/2020 25.6 24.7 26.5 7.2 6.5 9.2 96
9/20/2020 25.1 23.7 26.8 7.3 6.5 9.2 96
9/21/2020 24.6 23.2 26.1 7.6 6.7 9.5 96
9/22/2020 24.3 22.7 26.4 7.8 6.3 9.8 96
9/23/2020 24.1 22.6 26.7 7.8 6.2 10.3 96
9/24/2020 23.6 23.1 24.0 7.0 6.3 8.2 96
9/25/2020 23.6 23.5 23.7 7.1 6.8 7.9 96
9/26/2020 23.6 23.1 23.8 7.4 6.7 8.1 96
9/27/2020 23.5 23.1 23.8 7.6 6.9 8.0 96
14

Table 1: Tillery Development
Daily Daily Daily Daily Daily Daily
Avg Temp Min Temp Max Temp Avg DO Min DO Max DO
Date (Deg C) (Deg C) (Deg C) (mg/L) (mg/L) (mg/L) N
9/28/2020 23.4 23.1 23.7 7.2 6.9 8.5 96
9/29/2020 23.4 23.2 23.5 7.4 6.9 8.3 96
9/30/2020 23.4 22.6 23.6 8.0 7.2 8.4 96
10/1/2020 23.3 22.2 25.0 7.8 7.2 9.3 95
10/2/2020 23.0 22.0 24.9 8.1 6.9 10.0 96
10/3/2020 22.7 21.1 25.0 8.2 7.0 10.0 96
10/4/2020 22.5 21.0 24.5 8.1 7.0 10.3 96
10/5/2020 22.4 20.9 25.0 8.2 7.1 10.0 96
10/6/2020 22.0 20.8 22.7 8.3 7.0 9.8 96
10/7/2020 22.3 21.2 25.0 8.4 7.4 10.2 96
10/8/2020 22.2 21.0 25.3 8.5 7.2 10.5 96
10/9/2020 21.9 21.8 22.1 9.4 8.4 10.0 96
10/10/2020 21.8 21.7 22.2 8.2 7.4 9.8 96
10/11/2020 21.7 21.6 21.9 7.7 7.5 9.5 96
10/12/2020 22.1 21.9 22.4 9.6 9.5 9.7 96
10/13/2020 21.7 21.4 21.9 9.6 9.0 9.9 95
10/14/2020 21.4 21.1 21.5 9.4 8.9 9.8 96
10/15/2020 21.1 21.0 21.2 9.1 8.9 9.4 96
10/16/2020 21.0 20.9 21.1 9.0 8.8 9.2 95
10/17/2020 21.0 20.8 21.1 9.2 8.9 9.4 96
10/18/2020 20.8 20.6 20.9 9.1 8.8 9.3 96
10/19/2020 20.7 20.5 20.9 9.0 8.6 9.5 95
10/20/2020 20.3 19.7 20.7 8.5 7.7 9.2 96
10/21/2020 20.3 20.1 20.6 8.5 7.6 9.4 95
10/22/2020 20.2 19.8 20.5 8.5 7.5 9.1 96
10/23/2020 20.3 20.0 20.6 8.4 7.6 9.2 96
10/24/2020 20.2 19.9 20.8 8.1 7.4 9.6 96
10/25/2020 20.3 20.1 20.4 8.0 7.4 8.7 95
10/26/2020 20.4 20.4 20.5 8.6 8.3 8.8 96
10/27/2020 20.3 20.2 21.2 8.0 7.7 9.7 96
10/28/2020 20.2 20.0 20.2 7.6 7.3 7.9 95
10/29/2020 20.0 19.8 20.1 7.8 7.5 8.2 96
10/30/2020 20.2 20.1 20.4 9.0 7.7 10.0 95
10/31/2020 19.7 19.3 20.1 9.8 9.3 10.1 96
11/1/2020 19.0 18.7 19.2 9.5 9.1 10.0 99
11/2/2020 18.4 18.2 18.6 9.4 9.1 9.6 95
11/3/2020 18.1 16.9 18.3 9.2 8.5 9.3 96
11/4/2020 17.9 17.7 18.3 9.3 9.1 9.7 96

15

Table 1: Tillery Development
Daily Daily Daily Daily Daily Daily
Avg Temp Min Temp Max Temp Avg DO Min DO Max DO
Date (Deg C) (Deg C) (Deg C) (mg/L) (mg/L) (mg/L) N
11/5/2020 17.7 17.6 18.0 9.3 9.1 9.6 96
11/6/2020 17.6 17.5 17.7 9.4 9.2 9.5 96
11/7/2020 17.6 17.5 17.7 9.5 9.3 9.7 96
11/8/2020 17.6 17.5 17.8 9.5 9.3 9.7 95
11/9/2020 17.6 17.5 17.7 9.3 9.1 9.5 95
11/10/2020 17.7 17.6 17.8 9.3 9.1 9.6 96
11/11/2020 17.6 17.5 17.9 9.1 8.6 9.8 96
11/12/2020 17.7 17.4 18.2 9.6 8.5 10.6 96
11/13/2020 17.2 17.0 17.8 10.9 10.6 11.4 95
11/14/2020 17.2 17.1 17.5 11.3 11.1 11.5 96
11/15/2020 17.6 17.5 17.6 10.5 10.1 11.1 96
11/16/2020 17.5 17.4 17.6 10.0 9.8 10.4 96
11/17/2020 17.3 17.0 17.4 9.6 9.5 9.9 96
11/18/2020 16.5 14.9 17.0 9.2 8.4 9.7 96
11/19/2020 16.3 14.7 16.6 9.1 8.4 9.8 96
11/20/2020 16.1 14.4 16.4 8.9 8.2 9.2 96
11/21/2020 15.9 14.8 16.1 8.8 8.1 9.2 95
11/22/2020 15.6 14.8 15.8 8.8 8.1 9.5 96
11/23/2020 15.8 15.7 15.9 8.8 8.4 9.7 96
11/24/2020 15.4 14.2 15.7 8.9 8.1 9.0 96
11/25/2020 15.2 14.4 15.4 8.7 7.9 9.0 96
11/26/2020 15.3 15.2 15.4 8.6 8.0 8.8 96
11/27/2020 15.3 15.2 15.4 8.7 7.8 9.7 96
11/28/2020 15.1 14.9 15.3 8.8 7.8 9.0 96
11/29/2020 14.8 14.0 15.1 8.9 8.3 9.2 96
11/30/2020 15.0 14.8 15.2 9.0 8.4 9.5 96

16

Table 2. Daily average, minimum, and maximum DO (mg/L) and water temperature (oC)
measured downstream of the Blewett Falls Development (USGS Station No.
0212880025) May 1 - November 30, 2020.

Table 2: Blewett Falls Development
Daily Daily Daily Daily Daily Daily
Avg Temp Min Temp Max Temp Avg DO Min DO Max DO
Date (Deg C) (Deg C) (Deg C) (mg/L) (mg/L) (mg/L) N
5/1/2020 18.6 17.9 19.4 9.6 9.1 10.1 96
5/2/2020 18.3 17.6 19.8 9.7 9.4 9.9 96
5/3/2020 19.0 18.3 19.9 9.3 9.0 9.7 95
5/4/2020 19.9 18.8 21.2 9.2 8.7 10.1 95
5/5/2020 20.3 19.8 20.8 8.9 8.4 9.6 94
5/6/2020 20.7 19.9 22.2 9.0 8.2 10.4 96
5/7/2020 20.2 19.5 21.1 9.2 8.5 10.4 96
5/8/2020 19.5 19.0 19.9 9.0 8.4 9.7 95
5/9/2020 19.2 18.5 20.2 9.1 8.4 10.3 94
5/10/2020 18.8 18.1 20.2 9.4 8.5 10.6 96
5/11/2020 19.1 18.2 20.3 9.4 8.7 10.4 94
5/12/2020 19.3 18.4 20.9 9.5 8.2 11.2 96
5/13/2020 19.4 18.7 20.1 8.8 7.6 10.6 92
5/14/2020 19.8 18.9 20.7 9.0 7.4 10.8 94
5/15/2020 20.3 19.3 21.5 9.4 8.3 11.2 94
5/16/2020 21.5 20.2 23.0 8.8 7.2 10.8 96
5/17/2020 22.2 21.3 23.0 8.6 7.1 10.0 96
5/18/2020 23.0 22.4 23.8 8.5 7.2 10.2 95
5/19/2020 22.0 21.1 23.0 8.5 7.8 9.1 95
5/20/2020 20.3 19.5 21.1 8.6 8.4 8.8 96
5/21/2020 19.0 18.5 19.6 9.0 8.4 9.8 95
5/22/2020 18.4 18.0 20.6 9.8 9.2 10.2 95
5/23/2020 18.9 18.2 20.2 9.8 9.6 10.1 95
5/24/2020 20.0 19.1 22.2 9.5 9.2 9.8 96
5/25/2020 20.6 20.2 21.2 9.1 8.9 9.3 96
5/26/2020 20.6 20.2 21.0 9.1 8.7 9.4 96
5/27/2020 20.3 20.1 20.8 8.9 8.6 9.1 94
5/28/2020 20.4 19.9 21.4 9.4 8.9 9.9 94
5/29/2020 20.6 20.3 21.4 9.4 9.2 9.6 96
5/30/2020 20.8 20.2 21.7 9.3 9.0 9.6 96
5/31/2020 21.2 20.7 22.3 9.2 8.9 9.4 95
6/1/2020 21.7 21.0 22.5 8.8 8.6 9.1 96
6/2/2020 22.2 21.6 23.2 8.7 8.3 9.1 96
6/3/2020 22.4 21.7 23.7 8.7 8.2 9.1 93

17

Table 2: Blewett Falls Development
Daily Daily Daily Daily Daily Daily
Avg Temp Min Temp Max Temp Avg DO Min DO Max DO
Date (Deg C) (Deg C) (Deg C) (mg/L) (mg/L) (mg/L) N
6/4/2020 22.9 22.3 24.0 8.7 8.3 9.4 94
6/5/2020 23.3 22.7 24.2 8.4 7.4 9.5 96
6/6/2020 24.0 23.0 25.4 8.6 7.6 10.4 94
6/7/2020 24.3 23.7 24.9 8.3 7.6 9.5 95
6/8/2020 24.5 23.9 25.2 8.2 7.6 9.2 96
6/9/2020 24.9 24.4 25.7 8.0 7.5 8.9 95
6/10/2020 25.2 24.5 26.4 7.9 6.7 9.3 95
6/11/2020 25.3 25.0 25.8 7.5 6.4 8.4 95
6/12/2020 25.8 25.2 26.8 8.0 7.2 9.2 96
6/13/2020 25.4 24.6 26.2 7.8 6.4 8.5 96
6/14/2020 25.5 24.8 26.2 7.4 5.8 8.4 96
6/15/2020 24.6 24.0 25.3 7.1 6.4 7.7 96
6/16/2020 23.4 22.7 24.0 7.1 6.7 7.8 95
6/17/2020 22.5 22.2 22.7 7.3 6.5 8.3 96
6/18/2020 22.5 22.0 23.3 8.0 7.4 8.7 96
6/19/2020 22.9 22.5 23.6 8.1 7.8 8.4 93
6/20/2020 23.7 23.0 24.6 8.1 7.7 8.6 96
6/21/2020 24.0 23.4 24.7 7.9 7.6 8.4 96
6/22/2020 24.8 23.9 26.0 8.0 7.4 8.6 94
6/23/2020 25.4 24.5 26.5 7.5 7.0 8.2 96
6/24/2020 25.5 25.0 26.1 7.2 6.8 8.0 95
6/25/2020 25.5 25.2 26.0 6.7 6.1 7.5 96
6/26/2020 26.0 25.3 26.9 7.1 6.7 8.0 95
6/27/2020 26.4 25.4 27.6 7.3 6.5 8.0 96
6/28/2020 26.7 25.9 27.9 7.5 6.8 8.7 95
6/29/2020 27.2 26.3 28.2 7.6 6.4 9.4 94
6/30/2020 27.2 26.6 27.8 7.4 6.2 9.1 96
7/1/2020 26.8 26.4 27.8 6.3 5.2 7.3 94
7/2/2020 26.9 26.1 28.2 5.6 4.7 6.4 96
7/3/2020 27.8 26.8 28.9 6.5 5.5 7.8 94
7/4/2020 27.8 26.9 28.7 6.5 5.1 8.7 95
7/5/2020 27.7 26.8 29.1 5.6 4.8 7.3 92
7/6/2020 27.9 26.8 29.6 6.0 4.9 7.9 95
7/7/2020 27.7 27.4 28.2 5.6 4.3 6.7 96
7/8/2020 27.7 27.2 28.3 4.9 4.3 5.9 96
7/9/2020 27.6 27.0 28.3 5.2 3.5 6.4 95
7/10/2020 27.8 26.9 29.1 5.8 3.7 9.0 96
7/11/2020 28.2 26.8 29.6 6.9 5.0 10.2 95
7/12/2020 28.7 27.7 29.6 6.3 3.4 9.1 95

18

Table 2: Blewett Falls Development
Daily Daily Daily Daily Daily Daily
Avg Temp Min Temp Max Temp Avg DO Min DO Max DO
Date (Deg C) (Deg C) (Deg C) (mg/L) (mg/L) (mg/L) N
7/13/2020 28.4 27.6 29.4 4.9 2.3 8.0 96
7/14/2020 28.9 27.6 30.5 5.2 3.4 6.8 96
7/15/2020 28.5 27.9 29.2 4.2 2.1 5.7 96
7/16/2020 28.3 27.7 29.0 4.9 2.6 6.1 96
7/17/2020 28.6 27.7 29.7 5.0 2.7 7.7 96
7/18/2020 28.6 28.1 29.3 6.0 5.0 7.5 96
7/19/2020 28.6 28.1 29.2 5.2 1.7 6.9 96
7/20/2020 28.8 28.0 30.2 5.4 2.2 8.3 94
7/21/2020 28.9 28.2 30.3 6.0 3.3 8.6 95
7/22/2020 29.2 28.5 30.2 5.6 3.4 7.3 96
7/23/2020 29.4 28.7 30.3 6.2 5.2 7.2 96
7/24/2020 29.6 28.7 31.6 6.3 4.0 10.2 96
7/25/2020 29.4 28.7 30.5 5.7 2.9 8.1 96
7/26/2020 29.3 28.5 30.3 5.5 1.9 8.3 95
7/27/2020 29.7 28.6 30.9 4.4 1.2 8.8 96
7/28/2020 30.3 29.0 32.1 4.5 0.6 8.9 96
7/29/2020 29.9 29.3 30.7 5.3 1.2 7.2 95
7/30/2020 29.6 29.1 30.3 5.2 2.0 6.5 96
7/31/2020 29.8 29.2 30.7 5.3 2.5 6.5 95
8/1/2020 29.8 29.2 31.0 5.8 3.0 7.4 95
8/2/2020 29.5 28.7 30.3 5.2 2.9 7.2 95
8/3/2020 29.3 29.0 30.1 5.8 3.1 7.5 95
8/4/2020 29.2 28.8 29.7 5.9 4.0 6.7 96
8/5/2020 28.6 28.2 29.2 5.7 4.8 6.8 96
8/6/2020 28.8 28.2 29.7 6.3 5.3 7.6 95
8/7/2020 29.2 28.6 30.4 6.8 5.3 9.4 96
8/8/2020 29.3 28.8 30.0 7.3 6.6 8.8 94
8/9/2020 29.5 28.9 30.3 7.3 6.6 8.9 96
8/10/2020 29.6 29.1 30.9 7.2 6.3 8.7 95
8/11/2020 29.6 29.1 30.2 6.8 5.7 8.0 94
8/12/2020 29.7 29.0 30.5 6.9 6.0 8.5 96
8/13/2020 29.7 29.4 30.2 6.7 6.0 7.5 96
8/14/2020 29.4 29.1 29.8 6.1 5.0 6.6 95
8/15/2020 29.1 28.9 30.0 6.6 5.6 7.4 96
8/16/2020 28.8 28.5 29.0 7.2 6.5 7.9 96
8/17/2020 28.6 28.3 29.3 7.4 6.8 7.8 96
8/18/2020 28.4 28.1 28.7 7.2 6.6 7.8 96
8/19/2020 28.2 27.9 29.0 6.7 5.5 7.4 96
8/20/2020 28.3 27.8 28.9 6.9 6.3 7.6 96

19

Table 2: Blewett Falls Development
Daily Daily Daily Daily Daily Daily
Avg Temp Min Temp Max Temp Avg DO Min DO Max DO
Date (Deg C) (Deg C) (Deg C) (mg/L) (mg/L) (mg/L) N
8/21/2020 28.2 27.9 28.5 6.5 5.3 7.0 96
8/22/2020 28.1 27.8 28.5 7.1 6.7 7.8 96
8/23/2020 28.1 27.8 28.6 7.0 5.9 7.6 96
8/24/2020 28.1 27.8 28.7 7.2 6.8 8.3 95
8/25/2020 28.1 27.7 28.6 6.8 6.2 7.8 95
8/26/2020 28.2 27.6 28.8 7.2 6.3 8.6 96
8/27/2020 28.6 27.8 29.7 6.6 5.6 7.5 95
8/28/2020 28.7 28.2 29.6 6.9 5.7 8.8 94
8/29/2020 28.7 28.4 29.2 6.9 6.5 7.5 94
8/30/2020 28.7 28.3 29.3 6.2 5.8 6.5 96
8/31/2020 28.3 27.9 28.8 6.2 5.1 7.0 96
9/1/2020 28.6 28.2 29.3 7.0 6.0 8.3 96
9/2/2020 27.9 27.6 28.6 6.5 5.8 7.0 94
9/3/2020 28.1 27.3 28.8 6.5 5.8 6.8 94
9/4/2020 28.5 28.0 29.2 6.3 5.6 7.0 95
9/5/2020 28.3 27.9 28.7 5.7 4.7 6.9 96
9/6/2020 27.8 27.3 28.2 5.3 4.5 6.6 95
9/7/2020 27.4 26.8 28.1 5.7 4.7 6.6 96
9/8/2020 26.9 26.4 27.2 6.3 5.1 7.3 95
9/9/2020 26.9 26.6 27.5 6.3 5.8 7.0 95
9/10/2020 27.2 26.8 27.6 6.4 5.7 7.2 96
9/11/2020 27.3 26.7 27.9 6.3 5.2 7.5 96
9/12/2020 27.1 26.9 27.4 5.5 4.7 6.0 96
9/13/2020 27.5 26.8 28.4 6.2 5.1 6.9 96
9/14/2020 27.5 27.0 27.9 6.4 5.5 7.0 96
9/15/2020 27.1 26.6 27.9 5.7 4.8 7.0 96
9/16/2020 26.6 26.2 27.0 6.6 5.4 7.8 96
9/17/2020 26.2 26.0 26.6 7.4 7.1 7.8 96
9/18/2020 25.9 25.7 26.2 6.9 6.3 7.2 957
9/19/2020 24.9 24.1 25.7 6.8 6.4 7.9 96
9/20/2020 23.8 23.1 24.2 6.6 6.3 7.2 96
9/21/2020 23.0 22.5 23.5 7.0 6.4 7.8 96
9/22/2020 22.4 21.7 23.4 7.2 6.5 8.0 96
9/23/2020 22.2 21.3 23.1 6.8 6.1 7.9 96
9/24/2020 22.3 21.8 22.8 7.1 6.4 7.8 96
9/25/2020 22.5 22.2 22.8 7.8 7.2 9.0 96
9/26/2020 23.1 22.7 23.5 7.8 7.6 8.1 96

7 DO only had one missing observation on 9/18/2020.
20

Table 2: Blewett Falls Development
Daily Daily Daily Daily Daily Daily
Avg Temp Min Temp Max Temp Avg DO Min DO Max DO
Date (Deg C) (Deg C) (Deg C) (mg/L) (mg/L) (mg/L) N
9/27/2020 22.2 21.7 23.2 7.3 7.0 7.6 96
9/28/2020 22.4 22.2 22.6 7.3 6.7 7.8 94
9/29/2020 23.3 22.6 23.7 7.7 7.4 8.0 96
9/30/2020 23.6 23.4 23.8 7.6 7.1 8.1 95
10/1/2020 22.9 22.5 23.4 7.3 6.9 8.0 96
10/2/2020 22.7 22.3 23.1 7.7 6.7 8.4 96
10/3/2020 22.5 22.0 23.2 8.1 7.4 8.9 95
10/4/2020 22.0 21.6 22.3 8.2 7.6 8.6 96
10/5/2020 21.8 21.5 22.5 8.2 7.8 8.8 96
10/6/2020 21.6 21.0 22.3 8.2 7.7 8.9 95
10/7/2020 21.9 21.2 22.9 8.3 7.5 9.0 96
10/8/2020 22.0 21.5 22.5 8.3 7.9 9.1 95
10/9/2020 22.3 22.2 22.4 8.0 7.7 8.4 96
10/10/2020 22.4 22.3 22.4 8.3 8.0 8.4 96
10/11/2020 22.4 22.4 22.5 8.3 7.9 8.6 96
10/12/2020 21.8 21.4 22.5 7.7 7.0 8.6 96
10/13/2020 21.8 21.6 21.9 7.5 7.2 7.8 96
10/14/2020 21.5 21.2 21.9 7.9 7.5 8.3 95
10/15/2020 21.3 21.1 21.5 8.0 7.7 8.5 96
10/16/2020 21.4 21.2 21.6 8.4 8.2 8.6 95
10/17/2020 20.8 20.5 21.3 8.5 8.4 8.7 96
10/18/2020 20.0 19.8 20.5 8.6 8.3 8.9 96
10/19/2020 19.8 19.6 20.0 8.8 8.7 9.0 96
10/20/2020 20.0 19.7 20.3 8.9 8.6 9.0 96
10/21/2020 20.4 20.1 20.9 8.8 8.3 9.2 96
10/22/2020 20.7 20.4 20.9 8.4 8.2 8.8 96
10/23/2020 20.9 20.8 21.2 8.0 7.6 8.3 96
10/24/2020 21.0 20.8 21.2 7.9 7.5 8.4 96
10/25/2020 21.3 21.0 21.6 8.1 7.6 8.8 96
10/26/2020 20.9 20.3 21.6 8.6 8.3 8.8 96
10/27/2020 20.2 19.9 20.6 8.3 8.1 8.6 96
10/28/2020 20.4 20.3 20.5 8.0 7.6 8.2 96
10/29/2020 20.3 20.2 20.6 8.0 7.9 8.2 96
10/30/2020 20.5 20.1 20.6 8.1 7.9 8.3 96
10/31/2020 19.7 19.6 20.0 8.7 8.1 9.0 96
11/1/2020 19.2 18.8 19.6 9.0 8.9 9.0 100
11/2/2020 18.1 17.6 18.8 9.2 8.9 9.7 95
11/3/2020 17.1 16.9 17.6 9.3 9.0 9.7 96
11/4/2020 16.9 16.7 17.3 9.5 9.4 9.6 96

21

Table 2: Blewett Falls Development
Daily Daily Daily Daily Daily Daily
Avg Temp Min Temp Max Temp Avg DO Min DO Max DO
Date (Deg C) (Deg C) (Deg C) (mg/L) (mg/L) (mg/L) N
11/5/2020 16.9 16.7 17.2 9.5 9.3 9.6 96
11/6/2020 17.1 17.0 17.4 9.4 9.2 9.6 96
11/7/2020 17.6 17.4 18.0 9.3 9.2 9.5 96
11/8/2020 18.0 17.8 18.2 9.4 9.2 9.6 96
11/9/2020 18.1 18.1 18.3 9.6 9.4 9.8 96
11/10/2020 18.2 18.1 18.3 9.5 9.4 9.7 96
11/11/2020 18.3 18.2 18.5 9.4 9.3 9.5 96
11/12/2020 18.6 18.2 18.8 9.0 8.2 9.4 96
11/13/2020 18.2 17.9 18.3 8.5 8.2 8.8 96
11/14/2020 17.6 17.5 17.9 8.7 8.3 9.0 96
11/15/2020 17.6 17.4 17.8 8.5 7.7 9.0 96
11/16/2020 17.5 17.2 17.8 8.0 7.3 8.6 96
11/17/2020 16.8 16.3 17.2 8.7 8.1 9.4 96
11/18/2020 16.0 15.6 16.3 9.4 8.9 9.7 96
11/19/2020 15.1 14.9 15.6 9.7 9.5 9.9 96
11/20/2020 15.0 14.5 15.4 9.8 9.2 10.0 96
11/21/2020 15.0 14.8 15.3 9.6 9.2 9.9 96
11/22/2020 15.1 15.0 15.4 9.7 9.5 9.8 96
11/23/2020 15.4 15.2 15.5 9.6 9.4 9.8 96
11/24/2020 15.1 14.9 15.4 9.6 9.5 9.8 96
11/25/2020 14.5 14.2 14.9 9.7 9.3 9.9 96
11/26/2020 14.7 14.5 15.1 9.7 9.5 9.9 96
11/27/2020 15.3 15.1 15.7 9.5 9.2 9.8 95
11/28/2020 15.5 15.4 15.6 9.4 9.2 9.5 96
11/29/2020 15.1 14.9 15.4 9.5 9.3 9.6 96
11/30/2020 14.9 14.8 15.0 9.6 9.4 9.8 968

8 Temperature only had two missing values on 11/30/2020.
22

Table 3. Maintenance/calibration dates for USGS water quality stations at the Tillery and Blewett
Falls developments during the 2020 water quality monitoring season.

Tillery Development: USGS Station No. 0212378405
Date Time Explanation
04/15/2020 10:59
Sonde deployment and upgraded SL3 firmware to
v8.28
06/09/2020 09:05 Replaced sonde and calibration
09/04/2020 10:11
Replaced sonde and calibration and performed
cross-section channel profile
01/26/2021 10:28
Calibration check, upgraded SL3 firmware to
v8.35 and sonde removal
Blewett Falls Development: USGS Station No. 0212880025
Date Time Explanation
04/16/2020 09:09
Sonde deployment and updated SL3 firmware to
V8.28
06/22/2020 10:07 Replaced sonde and calibration
08/28/2020 08:59
Replaced sonde and calibration and perform cross-
section channel profile with ADCP
12/09/2020 10:36
Calibration check and sonde removal, upgraded
SL3 firmware to v8.35