Addendum 2~20.pdf

August 14, 2025

ADDENDUM # 2

Title: Stone Creek Environmental Compliance Monitoring

RFP # 25-142-PSC

This addendum adds additional information to the original RFP document.

QUESTION & ANSWER

1. Is EWEB open to discussions about alternative approaches such as [real-time data access etc.]?

Response: Very much so. In Section 5.1 Company Experience, one of the questions to respond to is “Describe anticipated approach to completing the work.” You should discuss at least one solid approach to completing the work, but feel free to talk about any new ideas, new technology, etc.

here, as possible alternatives to your core approach. Provide enough detail to allow EWEB to determine whether alternative approaches are realistically viable.

2. Can you please provide the following documents:

a. the most recent semi-annual Stone Creek Project Article 103 and Fish Screen Maintenance Compliance Report

b. A copy of recent gage and flow monitoring reports / a file of discharge measurements for each of the gages, including date, time, stage, discharge, method and preferably over the history of the gages at their current location

Response: Per 2.a., the most recent compliance report is attached here. Per 2.b., we will see what we can release via Addendum #3.

CHANGES TO RFP DOCUMENT

In Section 4, the first criteria listed for scoring the RFP responses is “Project Understanding”. This is incorrect. Please replace with “Company Experience”. Points remain the same (30 pts).

CLOSING DATE AND TIME: August 27, 2025

Remains unchanged.

This addendum constitutes a MATERIAL CHANGE to the Request for Proposals.

Addendum prepared by:

Sandra Hahn

Purchasing Analyst

Second Half 2024 Compliance Report

Stone Creek Hydroelectric Project

(FERC 5264-OR)

Article 103 and 408 Semi-Annual Environmental Compliance Report

July 1 – December 31, 2024

Prepared for

Eugene Water and Electric Board 4200 Roosevelt Operations Center Eugene, Oregon 97402

Prepared by

River Design Group, Inc.

SWCA Environmental Consultants 311 SW Jefferson Avenue Corvallis, Oregon 97333 www.swca.com

February 28, 2025

Stone Creek Hydroelectric Project FERC 5264-OR www.swca.com i February 2025

Executive Summary

The Eugene Water and Electric Board (EWEB) owns and operates the Stone Creek Hydroelectric Project (Stone Creek Project, P-5264), located on the Oak Grove Fork of the Clackamas River. Per the Federal Energy Regulatory Commission (FERC) Operating License, EWEB is required to comply with minimum streamflow verification (Article 103) and fish screen cleaning (Article 408) and report these activities on a semi-annual (i.e., twice per year) basis. This report details Article 103 and 408 compliance activities from July 1 to December 31, 2024.

Minimum flow verification occurred for the third and fourth quarters of 2024 by evaluating digital records collected from position analog transmitters (PAT) maintained at stream gages located below the Stone Creek Project Diversion and above the Stone Creek Powerhouse. Mean daily streamflow at the Diversion Gage and the Powerhouse Gage was checked for compliance using Rating Curve #21 and was maintained above the required minimums throughout the period (Attachment 1).

Most of the digital data record for the third and fourth quarters were complete. The following digital records (collected every 15 minutes) were missing from the database:

• July 3 - 7:15 to 8:15; 11 - 15:45

• August 11 - 4:15

• October 7 - 9:15; 22 - 15:30; 26 - 4:15; 29 - 20:15

• December 6 - 0:30; 8 - 19:45; 17 - 13:15; 21 - 14:30

The missing data points were augmented by linearly interpolating gage height and diverted flow records from adjacent data points in the digital record.

Overall, the gage height record was complete for both gages during the monitoring period between July 1 and December 31, 2024. The flow record for this period is considered to be of good reliability. U.S.

Geological Survey criteria for a “good” streamflow record require that 95 percent of the discharge records are accurate within 10 percent.

Additional field discharge measurements were collected in September and November 2024, and then used to develop Rating Curve #22, which is to be used for Q1 and Q2 of 2025.

Fish screens were checked and cleaned on a weekly or more frequent basis (Attachment 3). Debris accumulation was generally moderate during the reporting period with the highest accumulations occurring in October due to leaf fall and elevated streamflow. Debris was effectively removed, and any screen blockages were limited to a short period of time. No fish were found in the debris that was removed from the screens.

www.swca.com ii February 2025

Table of Contents

Executive Summary................................................................................................. i

1 Introduction

2 Stone Creek Diversion and Powerhouse Streamflow Monitoring

2.1 Introduction

2.2 Methods

2.2.1 Below Stone Creek Diversion Gaging Station

2.2.2 Above Stone Creek Powerhouse Gaging Station

2.3 Results

2.3.1 Diversion Gage

2.3.2 Powerhouse Gage

3 Fish Screen Maintenance Reporting

3.1 Introduction

3.2 Methods

3.3 Results

4 Summary

Attachment 1

Attachment 2

Attachment 3

Attachment 4 www.swca.com 1 February 2025

1 Introduction

The Eugene Water and Electric Board (EWEB) owns and operates the Stone Creek Hydroelectric Project (Stone Creek Project, P-5264). EWEB retained River Design Group, Inc. (RDG), now part of SWCA, Inc. to conduct routine compliance monitoring and reporting activities as required under Articles 103 and 408 of the Project’s Federal Energy Regulatory Commission (FERC) License (FERC 5264-OR). Under these two articles respectively, it is specified that EWEB must 1) monitor and verify minimum stream flows of the Oak Grove Fork of the Clackamas River (Figure 1-1) during project operation, and 2) provide monthly reports of fish screen maintenance and cleaning activities at the intake structure. Monitoring reports are required semi-annually. This report covers the period from July 1 to December 31, 2024.

Figure 1-1. Vicinity map of the Stone Creek Diversion and Powerhouse area on the Oak Grove Fork of the Clackamas River. Inset maps for the Powerhouse (A) and Diversion (B) are included. Approximate gage locations and cross-sections where discharge was measured (Q XS) are marked by red circle and line.

www.swca.com 2 February 2025

2 Stone Creek Diversion and Powerhouse Streamflow Monitoring

2.1 Introduction

As required by Article 103 of the Stone Creek Project License (FERC 5264-OR); EWEB must monitor and verify minimum streamflow of the Oak Grove Fork of the Clackamas River during project operation. EWEB has developed a FERC-approved streamflow monitoring plan to verify that streamflow immediately below the diversion does not drop below established required minimums and accretion within the diversion reach meets monthly assumed target values (Table 2-1).

Table 2-1. Mean monthly minimum streamflow requirements for the Stone Creek Project.

Month

Required Diversion Release

Assumed Accretion

Rate

Target Mean Powerhouse Flows with Full Assumed

Accretion

90% of Assumed Accretion

Target Mean Powerhouse Flows with 90% of Assumed Accretion

Jan 30 104 134 94 124

Feb 30 98 128 88 118

Mar 30 93 123 84 114

Apr 30 104 134 94 124

May 30 111 141 100 130

Jun 30 92 122 83 113

July 40 76 116 68 108

Aug 40 74 114 67 107

Sep 40 73 113 66 106

Oct 40 76 116 68 108

Nov 30 84 114 76 106

Dec 30 97 127 87 117

2.2 Methods

For the third and fourth quarters of 2024, minimum streamflow was verified using a combination of digital gage height and streamflow diversion records taken from two locations near the diversion structure and the powerhouse. Gage heights and streamflow diversions were measured every 30 minutes and electronically stored for evaluation and verification of project compliance with minimum streamflow requirements outlined in Table 2-1.

Continuous analog streamflow recorders (gages) have been in operation at their required locations since commencement of commercial operation on January 24, 1994. The gages are operated and maintained according to U.S. Geological Survey (USGS) standards with rating curve calibration and recorder servicing on an 8-week schedule. The Stone Creek Diversion is located upstream of the Diversion Gage and the Stone Creek Powerhouse is downstream of the Powerhouse Gage. Definition of streamflow variables, their location, and how they were calculated is given in (Figure 2-1).

www.swca.com 3 February 2025

2.2.1 Below Stone Creek Diversion Gaging Station

The base gage stilling well and instrument shelter are located on the right bank of the Oak Grove Fork Clackamas River approximately 200 feet downstream from the Stone Creek Diversion weir (Figure 2-2; see Figure 1-1 for relative location). The shelter houses a Stevens Type A-71 analog strip chart recorder and a Stevens Position Analog Transmitter (PAT). The gage is referenced to an enameled gage section in the well. An outside enameled section serves as a verification gage. Water level readings are transmitted to a computer in the powerhouse at one-half hour intervals. The gage monitors flow levels that bypass the Stone Creek Diversion.

Figure 2-2. Stone Creek Below Diversion Gage in June 2022. View is from approximately the center of the channel looking downstream.

Figure 2-1. Flow routing diagram and variable definition for the Stone Creek hydroelectric project, where TL is Timothy Lake, QAbvDiv is the calculated discharge above the diversion weir, QDiv is the measured diverted discharge also referred to as penstock flow (QPenstock), QBlwDiv is discharge below the diversion calculated from the rating curve also referred to as bypass flow (QBypass), Qaccr is the calculated accretion flow, QAbvPH is discharge above the powerhouse calculated from the rating curve, and QBlwPH is the calculated discharge below the powerhouse.

www.swca.com 4 February 2025

This gage was installed at this site on November 16, 1994, but it was not go on-line until February 12, 1995. The record had previously been provided by a pressure transducer gage at the diversion works.

Larry Hubbard, Michael Barclay, and Jed Huff surveyed water surface and gage levels at an arbitrary datum at the downstream gage on September 16, 1993. This datum was adjusted by plus 0.14 feet when the gage was installed on November 16, 1994. Peter Gruendike and Jack Zunka of RDG completed a topographic survey of the gage site and monumented discharge cross section on August 30, 2022. A combination of real time kinematic (RTK) GPS and total station was used to establish real-world elevations for the gage datum and water surface elevations. Figure 2-3 includes a plot of the completed topographic survey and reference water surface elevations at the gage discharge section.

Figure 2-3. Cross-section plot of ground survey of the Below Diversion gage discharge section (looking downstream). The black line represents the ground survey, and the blue and red lines represent the water surface elevations associated with the 30 cfs and 40 cfs compliance flows, respectively.

Stilling well water levels are transmitted to the computer at the Stone Creek Powerhouse. The analog chart recorder is used for verification and backup. There were 11 missing digital records for this monitoring period that were augmented by interpolating from adjacent data points. All the missing records were a single measurement, except for July 3 which had 1 hour of missing data. The gage height record is complete for the monitoring period.

Discharge data were collected at the cross-section located approximately 25 feet downstream of the Diversion Gage using a Sontek RS5 Acoustic Doppler Current Profiler (ADCP). The measurement cross-section is in approximately the same location as the former section used for discharge measurements prior to 2021. The ADCP unit was mounted to a hydroboard and tethered to a tag line and pulley system at the monumented cross-section location. The RS5 has a differential GPS unit that allows for accurate positioning and track reference to ensure consistent measurement distances at the monitoring section.

The RS5 also connects via Bluetooth to a streamside tablet that allows tracking velocity measurements and streamflow calculations in real-time through the RSQ software platform. Measurement statistics were summarized for each transect allowing the operator to determine if additional measurements are needed to minimize streamflow estimate error. A minimum of ten discharge measurements were collected per cross-section during each data collection to maximize measurement accuracy. In post-processing, any major outlier measurements were discarded, and then the mean discharge measurement was calculated and reported for the final discharge for the data collection event. The mean discharge was calculated from www.swca.com 5 February 2025 a minimum of eight individual discharge measurements from each data collection event. Figure 2-4 includes a graphical representation of channel velocities and the summary statistics for the ten discharge measurements taken at the Diversion Gage cross-section on April 5, 2022.

Figure 2-4. Example RSQ program output from a stream discharge measurement at the Stone Creek Below Diversion gage collected with RDG’s RS5 ADCP. The top graphic indicates water velocity and channel depth.

The tabular data provides a summary of 10 discharge measurements collected at the monumented cross-section with the ADCP.

Gage height records are correlated to predicted stream discharges by applying a recent rating curve equation generated from a series of field discharge measurements. Stage-discharge Rating #21 (Table 2-2) was calculated using 61 flow measurements from January 2009 through April 2024 and has an R2 value of

0.9756 and is used to check compliance in the third and fourth quarters of 2024. Each measurement in Rating #21 plotted less than ± 10% difference. Two additional discharge measurements were collected during the third and fourth quarter monitoring periods on September 6 and November 5, 2024. Two of these measurements were incorporated into Rating #22, which has an R2 value of 0.9740 and is used to calculate discharge in the first and second quarters of 2025 and is included herein in Attachment 3.

2.2.2 Above Stone Creek Powerhouse Gaging Station

The Above Powerhouse Gage is located approximately 150 feet upstream of the powerhouse on the right bank of the Oak Grove Fork Clackamas River (Figure 2-5; see Figure 1-1 for relative location). The base gage is a Stevens Type A-71 chart recorder driven by a float and pulley system housed in a plywood shelter over a corrugated pipe stilling well. The gage is referenced to an enameled gage section inside the well.

An outside enameled gage section serves as a verification gage. The chart recorder is linked with a Stevens PAT which transmits one-half hour water level data to the powerhouse computer. EWEB installed a redundant Campbell Scientific CS-451 pressure transducer in the gage stilling well in the fourth quarter of 2023. The gage monitors water levels of flow upstream from where the diversion flow re-enters the river at the Stone Creek Powerhouse. The hydraulic control for the gage was severely scoured by high flows in February 1996. A large log was placed on the scoured control in the stream to repair the scour damage and re-establish a stable gage pool in August 1999.

www.swca.com 6 February 2025

Figure 2-5. The Stone Creek Above Powerhouse Gage in January 2022. View is from the right bank of the Oak Grove Fork Clackamas River, looking from downstream to upstream.

The gage was installed at an arbitrary datum. Peter Gruendike and Jack Zunka of RDG completed a topographic survey of the gage site and monumented discharge cross section on August 30, 2022. A combination of real time kinematic (RTK) GPS and total station was used to establish real-world elevations for the gage datum and water surface elevations. Figure 2-6 includes a plot of the completed topographic survey and reference water surface elevations at the gage discharge section.

The stilling well water levels are transmitted to the computer at the Stone Creek Powerhouse and provide the primary water level record. A difference of greater than 0.2 feet in measurements between the two redundant instruments in the stilling well initiates an alarm at the powerhouse. The analog chart recorder is used for data verification and back-up. There were two missing digital records for this monitoring period that were augmented by interpolating from adjacent data points.

www.swca.com 7 February 2025

Figure 2-6. Cross-section plot of ground survey of the Above Powerhouse gage discharge section (looking downstream). The black line represents the ground survey, and the blue and red lines represent the water surface elevations associated with the 106 cfs and 125 cfs compliance flows, respectively.

Beginning on September 2nd, 2021, discharge data have been collected at a cross-section established directly adjacent to the Powerhouse Gage using an ADCP. This cross-section location is approximately 250 feet downstream of the measurement cross-section used prior to September 2021. The newly established cross-section is more difficult to wade, but has adequate depths for the ADCP, and likely results in more consistent and accurate measurements than the previous section location. The methodology for collecting discharge data at the Powerhouse location is the same as described above for the Diversion location.

Figure 2-7 includes a graphical representation of channel velocities and the summary statistics for the 12 transect measurements collected at the Powerhouse Gage cross-section on September 2, 2021.

Figure 2-7. Example RSQ program output from a stream discharge measurement at the Stone Creek Above Powerhouse gage collected with RDG’s RS5 ADCP. The top graphic indicates water velocity and channel depth.

The tabular data provides a summary of 12 discharge measurements collected at the monumented cross-section with the ADCP.

Stage-discharge Rating #21 was used to calculate predicted discharge for the digital gage height records.

Rating #21 was calculated using 48 measurements from October 2010 through June 2024 with an R2 value www.swca.com 8 February 2025 of 0.9583. Rating #21 was used to check compliance in the third and fourth quarters of 2024. Each measurement in the rating curve plotted less than ± 10% difference. Two additional discharge measurements were collected during the third and fourth quarter monitoring periods on September 6 and November 5, 2024. These measurements were incorporated into Rating #22, which has an R2 value of 0.9427 and is used to calculate discharge in the first and second quarters of 2025 and is included herein in Attachment 3.

2.3 Results

Minimum streamflow verification occurred for the third and fourth quarters of 2024 by evaluating digital records as well as paper chart records collected from position analog transmitters (PAT) maintained at stream gages located below the Stone Creek Project Diversion and above the Stone Creek Powerhouse.

The results of stream gage monitoring of the Oak Grove Fork of the Clackamas River for July 1, 2024, through December 31, 2024, at the sites below the Stone Creek Diversion and above the Stone Creek Powerhouse are presented below.

Most of the digital data record for the third and fourth quarters were complete. The following digital records (collected every 15 minutes) were missing from the database:

• July 3 - 7:15 to 8:15; 11 - 15:45

• August 11 - 4:15

• October 7 - 9:15; 22 - 15:30; 26 - 4:15; 29 - 20:15

• December 6 - 0:30; 8 - 19:45; 17 - 13:15; 21 - 14:30

The missing data points were augmented by linearly interpolating gage height and diverted flow records from adjacent data points in the digital record.

Mean daily streamflow at both the Diversion and Powerhouse gages were maintained above the required minimums throughout the period (Attachment 1).

Overall, the gage height record was complete for both gages during the monitoring period between July 1 and December 31, 2024. The flow record for this period is considered to be of good reliability. USGS criteria for a “good” stream flow record require that 95 percent of the discharge records are accurate within 10 percent.

An overview of the average daily hydrograph is presented in Figure 2-8 and Figure 2-9. The diverted discharge (i.e., penstock flow) was not reported in Q3 and Q4, so the discharges above the diversion and below powerhouse were not able to be calculated.

2.3.1 Diversion Gage

The Diversion Gage operated properly during the monitoring period. Streamflow records were computed by applying discharge directly from Rating #21 (Table 2-2). Additional flow measurements were taken in September and November during Q3 and Q4 of 2024, and these measurements were incorporated into Rating #22 for Q1 and Q2 for 2025. The flow record for this period is considered to be of good reliability.

Stream flows at the Diversion Gage were maintained above the target minimums for all of Q3 and Q4.

www.swca.com 9 February 2025

Figure 2-8 and Figure 2-9 include the Q3 and Q4 hydrographs, respectively, for the two gages. Table 2-2 includes the rating table for the Diversion Gage and monthly mean and minimum daily stream flow tables are included in Attachment 1. A summary of recent discharge measurements is included in Attachment 2.

A sediment wedge, sourced from gravel augmentation operations downstream of the diversion, has migrated into the Diversion Gage area during recent high flow events. Gravels associated with the sediment wedge have filled in around the large clasts at the gage site and could impact current and future rating tables. The sediment wedge will be monitored, and measurement adjustments will be made if needed to maintain the rating curve.

2.3.2 Powerhouse Gage

The Powerhouse Gage operated properly during the monitoring period. Streamflow records were computed by applying discharge directly from Rating #21 ( www.swca.com 10 February 2025

Table 2-3). Additional flow measurements were taken in September and November during the Q3 and Q4 of 2024 and were incorporated into Rating #22 for Q1 and Q2 for 2025. The flow record for this period is considered to be of good reliability. Streamflow at the Powerhouse Gage was maintained above the target for all of Q1 and Q2.

Figure 2-8 and Figure 2-9 include the Q3 and Q4 hydrographs, respectively, for the two gages. Table 2-3 includes the rating table for the Powerhouse Gage and monthly mean and minimum daily stream flow tables are included in Attachment 1. A summary of recent discharge measurements is included in Attachment 2.

www.swca.com 11 February 2025

Figure 2-8. Stone Creek daily average discharge hydrograph for Q3, 2024. Diverted Q was not reported in Q3.

www.swca.com 12 February 2025

Figure 2-9. Stone Creek daily average discharge hydrograph for Q4, 2024. Diverted Q was not reported in Q4.

www.swca.com 13 February 2025

Table 2-2. Discharge rating #21 for Oak Grove Fork below Stone Creek Diversion used for 2024 Q3 and Q4.

www.swca.com 14 February 2025

Table 2-3. Discharge rating #21 for Oak Grove Fork above Stone Creek Powerhouse used for 2024 Q3 and Q4.

www.swca.com 15 February 2025

3 Fish Screen Maintenance Reporting

3.1 Introduction

The Eugene Water and Electric Board (EWEB) owns and operates the Stone Creek Hydroelectric Project (Stone Creek Project, P-5264). As required by Article 408 of the Stone Creek Project Federal Energy Regulatory Commission (FERC) License (P-5264); EWEB must provide monthly reports of fish screen maintenance and cleaning activities at the intake structure. These reports are to include the following information: 1) dates and times of screen maintenance; 2) amount of debris on the screen; and 3) the type of debris on the screen. Fish screen monitoring reports are required semi-annually.

3.2 Methods

Fish screens are typically checked and cleaned at least once per week. Screens are not cleaned during times when streamflow was not being diverted. Approximate volume and composition of debris removed is recorded in the daily screen maintenance logs. The screen maintenance logs for July through December 2024 are provided in Attachment 3: Stone Creek Debris Removal Reports.

3.3 Results

Debris accumulation was generally moderate during the winter and spring months, with screen blockages ranging from 9 to 33 percent between July and December 2024. Highest debris accumulations were typically associated with high leaf loads in September and October and then high flows from storm events in December. Screens were cleaned frequently during this time period, with up to 15 shovel loads of debris removed per day. Screens were cleaned at least once per week throughout the compliance period.

Debris accumulated on the screens was typically comprised of detritus and aquatic weeds. No fish were found in the debris that was removed from the screens.

4 Summary

EWEB owns and operates the Stone Creek Hydroelectric Project (Stone Creek Project, P-5264). EWEB retained RDG to conduct routine compliance monitoring and reporting activities as required under Articles 103 and 408 of the Project’s FERC License (FERC 5264-OR). Under these two articles respectively, EWEB must 1) monitor and verify minimum streamflow of the Oak Grove Fork of the Clackamas River during project operation, and 2) provide monthly reports of fish screen maintenance and cleaning activities at the intake structure. This required semi-annual monitoring report covers the period from July 1, 2024, through December 31, 2024 (Q3 and Q4).

Minimum streamflow was verified using a combination of digital gage height and streamflow diversion records taken from two locations near the diversion structure and the powerhouse. Streamflow at the Diversion and Powerhouse gages were maintained above the target minimums throughout the period and thereby are compliant with Article 103 of the license conditions of FERC 5264-OR.

Fish screens were typically checked and cleaned on a weekly or more frequent basis, with the exception of times when site access was limited or during times when flow was not being diverted. Debris accumulation was generally moderate, with higher debris loads occurring during storms and high flow www.swca.com 16 February 2025 events. Debris was effectively removed, and any screen blockages were limited to a short period of time.

No fish were found in the debris that was removed from the screens. Monthly fish screen reports are provided in compliance with Article 408 of license conditions of FERC 5264-OR.

www.swca.com A-1 February 2025

Attachment 1

Oak Grove Fork and Stone Creek Diversion

Daily Streamflow Data www.swca.com A-2 February 2025 www.swca.com A-3 February 2025 www.swca.com A-4 February 2025 www.swca.com A-5 February 2025 www.swca.com A-6 February 2025 www.swca.com A-7 February 2025 www.swca.com A-8 February 2025

Attachment 2

Streamflow Measurement Summary Data www.swca.com A-9 February 2025 www.swca.com A-10 February 2025 www.swca.com A-11 February 2025

Attachment 3

Rating Curves #22 for 2025 Q1 and Q2 www.swca.com A-12 February 2025 www.swca.com A-13 February 2025 www.swca.com A-14 February 2025

Attachment 4

Stone Creek Debris Removal Reports

Month July

Date Time Total Time Type of Debris

Amount (Shovels)

Daily Total #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 Total Before After Remarks - Status

1-Jul 13:00 1 Aquatic weeds 1.5 1.5 10% 11% 11% 8% 7% 7% 6% 6% 10% 10% 11% 9% 0.32 0.10 Cleaned 11-Jul 13:00 1 Aquatic weeds 1 1 11% 11% 10% 7% 7% 7% 6% 6% 12% 10% 11% 9% 0.25 0.10 Cleaned 18-Jul 13:00 1 Aquatic weeds 1 1 10% 11% 10% 7% 7% 7% 6% 6% 11% 12% 11% 9% 0.25 0.10 Cleaned 25-Jul 13:00 1 Aquatic weeds 1 1 11% 12% 11% 7% 7% 7% 6% 6% 13% 11% 11% 9% 0.25 0.10 Cleaned 30-Jul 13:00 1 Aquatic weeds 1 1 14% 12% 12% 7% 7% 7% 6% 7% 12% 12% 11% 10% 0.24 0.10 Cleaned

Screen #1 is next to the fence. Screen #11 is next to the fish ladder.

Screen DP

2024Year

Stone Creek Debris Removal Report

Screen Blockage

Month August

Total Time Type of Debris

Amount (Shovels)

Daily Total #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 Total Before After Remarks - Status

1-Aug 13:00 1 Aquatic weeds 1 1 10% 11% 11% 8% 7% 7% 6% 6% 10% 10% 11% 9% 0.28 0.10 Cleaned 8-Aug 13:00 1 Aquatic weeds 1 1 11% 11% 10% 7% 7% 7% 6% 6% 12% 11% 11% 9% 0.26 0.10 Cleaned

14-Aug 13:00 1 Aquatic weeds 1 1 10% 11% 10% 7% 7% 7% 6% 6% 11% 12% 11% 9% 0.24 0.10 Cleaned 15-Aug 13:00 1 Aquatic weeds 3.5 3.5 28% 30% 31% 28% 30% 29% 29% 28% 34% 35% 33% 30% 0.90 0.21 Cleaned 25-Jul 13:00 1 Aquatic weeds 1 1 11% 12% 11% 7% 7% 7% 6% 6% 13% 11% 11% 9% 0.22 0.10 Cleaned 30-Jul 13:00 1 Aquatic weeds 1 1 14% 12% 12% 7% 7% 7% 6% 7% 12% 12% 11% 10% 0.22 0.10 Cleaned

Screen #1 is next to the fence. Screen #11 is next to the fish ladder.

Screen DP

2024Year

Month September

Total Time Type of Debris

Amount (Shovels)

Daily Total #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 Total Before After Remarks - Status

2-Sep 13:00 1 Leaves 4 4 14% 15% 16% 8% 7% 7% 6% 11% 15% 14% 16% 12% 0.74 0.25 Cleaned 7-Sep 13:00 1 Leaves 5 5 14% 14% 15% 8% 8% 8% 6% 11% 11% 14% 16% 11% 0.78 0.24 Cleaned 8-Sep 13:00 1 Leaves 3 3 16% 16% 17% 14% 14% 11% 11% 11% 17% 17% 16% 15% 0.78 0.28 Cleaned

10-Sep 13:00 1 Leaves 4 4 17% 16% 18% 11% 9% 11% 9% 15% 15% 14% 16% 14% 0.77 0.27 Cleaned 12-Sep 13:00 1 Leaves 5 5 17% 20% 18% 11% 9% 11% 9% 16% 16% 17% 16% 15% 0.76 0.26 Cleaned 13-Sep 13:00 1 Leaves 3 3 18% 19% 18% 11% 12% 13% 12% 12% 18% 18% 17% 15% 0.81 0.25 Cleaned 14-Sep 13:00 1 Leaves 3 3 17% 17% 17% 7% 7% 7% 6% 6% 16% 15% 17% 12% 0.88 0.27 Cleaned 15-Sep 13:00 1 Leaves 3 3 21% 24% 26% 18% 17% 11% 11% 15% 27% 28% 27% 20% 0.86 0.25 Cleaned 16-Sep 13:00 1 Leaves 5 5 24% 25% 25% 15% 16% 16% 16% 17% 28% 23% 31% 21% 0.87 0.24 Cleaned 18-Sep 13:00 1 Leaves 4 4 26% 25% 27% 13% 13% 12% 11% 11% 28% 31% 31% 21% 0.89 0.22 Cleaned 19-Sep 13:00 1 Leaves 3.5 3.5 15% 15% 15% 11% 12% 12% 12% 12% 16% 16% 17% 14% 0.84 0.26 Cleaned 20-Sep 13:00 1 Leaves 3 3 17% 18% 18% 10% 11% 11% 12% 18% 19% 19% 20% 16% 0.90 0.25 Cleaned 21-Sep 13:00 1 Leaves 6 6 21% 24% 27% 12% 16% 16% 15% 28% 29% 31% 34% 23% 0.92 0.24 Cleaned 22-Sep 13:00 1 Leaves 5 5 22% 25% 27% 15% 15% 16% 16% 31% 30% 31% 33% 24% 0.95 0.23 Cleaned 23-Sep 13:00 1 Leaves 7 7 22% 26% 28% 14% 14% 12% 14% 30% 30% 31% 33% 23% 0.96 0.25 Cleaned 24-Sep 13:00 1 Leaves 6 6 25% 26% 29% 21% 21% 21% 21% 29% 30% 31% 33% 26% 0.94 0.22 Cleaned 25-Sep 13:00 1 Leaves 7 7 28% 28% 27% 22% 21% 21% 21% 31% 21% 26% 32% 25% 0.95 0.26 Cleaned 26-Sep 13:00 1 Leaves 6 6 26% 29% 33% 24% 24% 24% 25% 33% 33% 38% 38% 30% 0.96 0.21 Cleaned 27-Sep 13:00 1 Leaves 8 8 27% 31% 33% 24% 24% 24% 24% 35% 34% 35% 37% 30% 0.94 0.25 Cleaned 29-Sep 13:00 1 Leaves 7 7 28% 31% 33% 22% 22% 21% 21% 35% 36% 35% 37% 29% 0.95 0.27 Cleaned 30-Sep 13:00 1 Leaves 8 8 29% 35% 36% 17% 17% 17% 18% 34% 36% 37% 37% 28% 0.97 0.25 Cleaned

9/31/202413:00 1 Leaves 9 9 30% 29% 31% 17% 17% 17% 16% 33% 36% 36% 37% 27% 0.94 0.23 Cleaned Screen #1 is next to the fence. Screen #11 is next to the fish ladder.

Screen DP

2024Year

Month October

Total Time Type of Debris

Amount (Shovels)

Daily Total #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 Total Before After Remarks - Status

3-Oct 13:00 1 Leaves 3 3 14% 15% 16% 8% 7% 7% 6% 11% 15% 14% 16% 12% 0.74 0.25 Cleaned 4-Oct 13:00 1 Leaves 12 12 23% 25% 28% 25% 25% 25% 25% 22% 31% 31% 31% 26% 0.78 0.24 Cleaned 6-Oct 13:00 1 Leaves 4 4 16% 16% 17% 14% 14% 17% 17% 17% 17% 17% 16% 16% 0.78 0.28 Cleaned 7-Oct 13:00 1 Leaves 3 3 17% 16% 18% 11% 16% 11% 16% 15% 15% 14% 16% 15% 0.77 0.27 Cleaned 8-Oct 13:00 1 Leaves 6 6 17% 20% 18% 11% 16% 11% 16% 16% 16% 17% 16% 16% 0.76 0.26 Cleaned 9-Oct 13:00 1 Leaves 5 5 18% 19% 18% 11% 12% 13% 12% 12% 18% 18% 17% 15% 0.81 0.25 Cleaned

10-Oct 13:00 1 Leaves 5 5 17% 17% 17% 16% 16% 15% 15% 15% 16% 15% 17% 16% 0.88 0.27 Cleaned 12-Oct 13:00 1 Leaves 6 6 21% 24% 26% 18% 17% 11% 11% 15% 27% 28% 27% 20% 0.86 0.25 Cleaned 13-Oct 13:00 1 Leaves 6 6 24% 25% 25% 15% 16% 16% 16% 17% 28% 23% 31% 21% 0.87 0.24 Cleaned 14-Oct 13:00 1 Leaves 10 10 26% 25% 27% 21% 22% 22% 31% 33% 33% 31% 31% 27% 0.89 0.22 Cleaned 15-Oct 13:00 1 Leaves 7 7 15% 15% 15% 11% 12% 12% 12% 12% 16% 16% 17% 14% 0.84 0.26 Cleaned 16-Oct 13:00 1 Leaves 12 12 25% 25% 25% 25% 24% 24% 25% 25% 25% 25% 25% 25% 0.90 0.25 Cleaned 17-Oct 13:00 1 Leaves 8 8 21% 24% 27% 12% 16% 16% 15% 28% 29% 31% 34% 23% 0.92 0.24 Cleaned 18-Oct 13:00 1 Leaves 8 8 22% 25% 27% 15% 15% 16% 16% 31% 30% 31% 33% 24% 0.95 0.23 Cleaned 19-Oct 13:00 1 Leaves 10 10 22% 26% 28% 14% 14% 12% 14% 30% 30% 31% 33% 23% 0.96 0.25 Cleaned 20-Oct 13:00 1 Leaves 15 15 31% 33% 33% 33% 28% 27% 27% 34% 34% 34% 34% 32% 0.94 0.22 Cleaned 21-Oct 13:00 1 Leaves 13 13 28% 28% 27% 22% 28% 28% 28% 31% 31% 13% 33% 27% 0.95 0.26 Cleaned 22-Oct 13:00 1 Leaves 11 11 26% 29% 33% 24% 24% 24% 25% 33% 33% 38% 38% 30% 0.96 0.21 Cleaned 23-Oct 13:00 1 Leaves 8 8 27% 31% 33% 24% 24% 24% 24% 35% 34% 35% 37% 30% 0.94 0.25 Cleaned 24-Oct 13:00 1 Leaves 14 14 36% 31% 31% 31% 31% 31% 31% 35% 36% 35% 37% 33% 0.95 0.27 Cleaned 25-Oct 13:00 1 Leaves 5 5 29% 35% 36% 17% 17% 17% 18% 34% 36% 37% 37% 28% 0.90 0.25 Cleaned 26-Oct 13:00 1 Leaves 4 4 21% 21% 21% 17% 16% 16% 16% 22% 2% 22% 22% 18% 0.90 0.25 Cleaned 27-Oct 13:00 1 Leaves 9 9 28% 22% 27% 22% 22% 22% 22% 22% 29% 30% 30% 25% 0.89 0.25 Cleaned 28-Oct 13:00 1 Leaves 5 5 26% 27% 25% 17% 17% 17% 17% 17% 21% 21% 21% 21% 0.91 0.24 Cleaned 29-Oct 13:00 1 Leaves 6 6 26% 26% 25% 21% 21% 16% 16% 16% 22% 22% 21% 21% 0.88 0.24 Cleaned 30-Oct 13:00 1 Leaves 5 5 22% 25% 22% 16% 16% 16% 16% 16% 22% 22% 21% 21% 0.88 0.24 Cleaned 31-Oct 13:00 1 Leaves 5 5 22% 29% 22% 17% 17% 17% 16% 22% 22% 22% 22% 21% 0.88 0.23 Cleaned

Screen #1 is next to the fence. Screen #11 is next to the fish ladder.

Screen DP

2024Year

Month November

Total Time Type of Debris

Amount (Shovels)

Daily Total #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 Total Before After Remarks - Status

2-Nov 13:00 1 aquatic weeds 3 3 11% 11% 11% 8% 7% 7% 6% 11% 15% 14% 16% 11% 0.67 0.22 Cleaned 4-Nov 13:00 1 aquatic weeds 3 3 12% 12% 12% 12% 11% 11% 11% 11% 12% 12% 11% 12% 0.72 0.24 Cleaned 6-Nov 13:00 1 aquatic weeds 3 3 14% 14% 13% 13% 13% 13% 13% 13% 13% 13% 13% 13% 0.73 0.25 Cleaned 7-Nov 13:00 1 aquatic weeds 2 2 11% 11% 12% 12% 12% 11% 16% 12% 12% 12% 12% 12% 0.72 0.22 Cleaned

11-Nov 13:00 1 aquatic weeds 2 2 11% 11% 18% 11% 16% 11% 12% 12% 12% 12% 12% 13% 0.65 0.26 Cleaned 14-Nov 13:00 1 aquatic weeds 2 2 11% 11% 12% 11% 12% 13% 12% 12% 18% 18% 17% 13% 0.68 0.25 Cleaned 18-Nov 13:00 1 aquatic weeds 3 3 11% 14% 12% 13% 13% 13% 13% 13% 13% 13% 11% 13% 0.67 0.23 Cleaned 21-Nov 13:00 1 aquatic weeds 3 3 11% 11% 11% 11% 12% 12% 11% 15% 12% 12% 12% 12% 0.69 0.22 Cleaned 26-Nov 13:00 1 aquatic weeds 2 2 11% 12% 12% 12% 12% 16% 16% 17% 16% 15% 12% 14% 0.65 0.20 Cleaned

Screen #1 is next to the fence. Screen #11 is next to the fish ladder.

Screen DP

2024Year

Month December

Total Time Type of Debris

Amount (Shovels)

Daily Total #1 #2 #3 #4 #5 #6 #7 #8 #9 #10 #11 Total Before After Remarks - Status

2-Dec 13:00 1 aquatic weeds 2 2 11% 11% 11% 10% 10% 10% 10% 11% 15% 14% 16% 12% 0.67 0.22 Cleaned 9-Dec 13:00 1 aquatic weeds 3 3 13% 14% 13% 12% 11% 11% 11% 11% 12% 12% 11% 12% 0.72 0.24 Cleaned 12-Dec 13:00 1 aquatic weeds 2 2 14% 14% 13% 13% 13% 13% 13% 13% 13% 13% 13% 13% 0.73 0.25 Cleaned 16-Dec 13:00 1 aquatic weeds 2 2 12% 12% 12% 12% 12% 11% 16% 12% 12% 12% 12% 12% 0.72 0.22 Cleaned 19-Dec 13:00 1 aquatic weeds 3 3 14% 15% 18% 11% 16% 11% 12% 12% 12% 12% 12% 13% 0.65 0.26 Cleaned 23-Dec 13:00 1 aquatic weeds 4 4 19% 21% 22% 22% 21% 21% 21% 22% 22% 22% 22% 21% 0.88 0.56 Cleaned 25-Dec 13:00 1 aquatic weeds 8 8 23% 26% 27% 22% 22% 21% 32% 33% 33% 35% 31% 28% 0.95 0.48 Cleaned 26-Dec 13:00 1 aquatic weeds 9 9 29% 31% 32% 23% 26% 27% 25% 33% 34% 35% 33% 30% 1.01 0.38 Cleaned 28-Dec 13:00 1 aquatic weeds 9 9 31% 33% 33% 29% 31% 31% 31% 33% 34% 35% 33% 32% 0.95 0.41 Cleaned

Screen #1 is next to the fence. Screen #11 is next to the fish ladder.

Screen DP

2024Year