Superior Combined Sewer Overflow Public Notification Plan.pdf

CITY OF SUPERIOR

Prepared by:

ESD Staff

Origination Date: 8/2018 Revision Dates: 2/2019

TABLE OF CONTENTS

SECTION 1 – INTRODUCTION

SECTION 2 – SIGNS

SECTION 3 – CONSULTATION

SECTION 4 – POTENTIALLY IMPACTED PUBLIC ACCESS AREAS

SECTION 5 – PROCEDURE FOR DETERMINING COMBINED SEWER OVERFLOW VOLUME AND

DURATION

SECTION 6 – NOTICE TO GOVERNMENTS AND OTHER ENTITIES

SECTION 7 – PUBLIC NOTICE

SECTION 8 – ANNUAL REPORT

APPENDICES

APPENDIX A – TABLE OF CONTACTS

APPENDIX B – COMBINED SEWER OVERFLOW DATA SHEET

SECTION 1 – INTRODUCTION

The City of Superior Environmental Services Division of Public Works (ESDPW) serves a population of 27,244 within the city of Superior (2010 census), and satellite sewer system of the Parkland Sanitary District. ESDPW operates four treatment facilities: the main treatment plant, and three auxiliary treatment facilities (CSTP). The three auxiliary treatment facilities have storage basins at each location. Updates to the collection system and main treatment plant, and changes made to the way the treatment facilities are run, have made overflows rare. Figure 1.1 shows the number of combined sewer overflow events per year since 1999. Figure 1.2 shows the total annual volume of combined sewer overflows since 1999.

Within the areas served by ESDPW, there are three sewer districts within the City of Superior that are served by combined sewers. The combined sewer service area is 7.9 square miles. The combined sewer overflow locations within the City of Superior are located at the auxiliary treatment facilities, that are located within the combined sewer service areas. Figure 1.3 shows ESDPW’s service area and the combined sewer service areas. Figures 1.4 to 1.6 show the combined sewer overflow locations. Table 1.1 lists the receiving water for each combined sewer overflow location.

ESDPW continuously monitors various parameters at the CSTP facilities, including precipitation, storage basin level, and influent (discharge) flow rate. Operators monitor the basin level, RADAR, and weather forecast to determine whether the CSTP facilities will be required to run or if the runoff volume may be contained in storage and returned to the sewerage system. If a determination is made to operate the CSTP facilities, effluent pumps are engaged. Effluent samples are collected and analyzed for compliance with permitted effluent limits. If the discharge duration exceeds 24 hours, samples are collected and analyzed for each applicable 24‐hour period. If levels within the basins reach the elevation of the spillway (CSTP 2 and CSTP 6) or overflow structure (CSTP 5), a Combined Sewer Overflow will occur with a discharge directly to a surface water. All CSOs at these facilities receive a minimum of treatment, including primary clarification and floatables removal prior to discharge, and are classified as “Treated Combined Sewer Overflows”.

ESDPW Operators identify possible overflows from alarms on the real‐time monitoring system. Overflows are verified using field observations.

ESDPW already notifies the public and other governmental agencies of combined sewer overflows. ESDPW is preparing this plan now in response to the new federal regulations, 40 CFR 122.38, which were published in the Federal Register on January 8, 2018, and became effective on February 7, 2018. For overflows to the Great Lakes Basin, these new regulations establish minimum overflow notification procedures and the preparation of a notification plan no later than August 7, 2018.

Figure 1.1 Number of Combined Sewer Overflow Wet Weather Events Per Year

Figure 1.2 Annual Total Combined Sewer Overflow Volume

(millions of gallons)

1.1

41.5 0.08 0.005

34.5 0.9 0.8

0.01

5.4

8.5 0.06 0.9 0.4

0 5 10 15 20 25 30 35 40 45

Volume (MG)

&V

&V

&V

&V

Parkland Sanitary District

CSTP 2

CSTP 5

MTP

CSTP 6

State Hwy 13

BELKNAP

US Hwy 2

CENTRAL

CNTY RD E

US 53

TO

WE

R

2ND

STATE HWY 105

I 53

AC

CE

SS

CNTY RD U

US HWY 2 & 53

CNTY RD Z

CO

UN

TY

RD

E

CNTY RD UU

US Hwy 53

State Hwy 3

CNTY RD C

CN

TY

R Ds

C &A

STATE HWY 13

CN

TY

R D A

US HWY 2

District 4

District 9

District 3B

District 8

District 7

District 6

District 1

District 2

District 3A

District 5

Legend Sanitary District Boundaries

&V Treatment Facility Sewer Districts Label

Separated Sanitary Sewer District Combined Sewer District

0 3,000 6,000 9,000 Feet

DISCLAIMER: Although information presented on this map is generally correct, it is not the intent to guarantee the attributes, location, or existence of the indicated features.

µ

CITY OF SUPERIORMAP OF THE

Sewer Service Area Planning Boundaries

Figure 1.3 Service Area Map abramsone Typewritten Text

Figure 1.4 CSTP 2 Overflow Location

Figure 1.5 CSTP 5 Overflow Location

Figure 1.6 CSTP 6 Overflow Location

Table 1.1 Combined Sewer Overflow Locations

Name Location Surface Water

CSTP 2 51 E. 1st Street Superior Bay

CSTP 5 61st Street & Birch Avenue Nemadji River

CSTP 6 Texas Avenue & 17th Street St. Louis River

SECTION 2 – SIGNS

2.1. Location

All combined sewer overflow locations have signs.

2.2. Explanation for overflow locations without signs

No overflow locations are without signs.

2.3. Sign Text

All signs have the same text. All signs identify the overflow location and an ESDPW telephone number; all signs were implemented prior to August 7, 2018. Figure 2.1 is an example of an existing sign; when the existing signs are determined to need replacement, the signs shall include at a minimum the following information:

A. Permittee name (City of Superior‐Superior Sewage Disposal System);

B. A description of the discharge (e.g. treated combined sewage) and a notice that sewage may be present in the water; and

C. Contact information, including a telephone number, NPDES permit number and CSO discharge point number as identified in the NPDES permit.

2.4. Inspections or other procedures to keep the signs legible, visible and correct

A general signage inspection occurs annually and is documented. In addition, inspections will occur when work occurs at an overflow location. ESDPW will correct or replace signs as needed.

Records are created and stored in the maintenance management software Maximo. Figure 2.2 is an example of a sign inspection log.

Figure 2.1 Existing CSO Location Sign

Figure 2.2 CSO Sign Inspection Log Example

SECTION 3 – CONSULTATION

The City of Superior utilizes the services of the Douglas County Department of Health & Human Services as its local health department. In response to the new requirements for a Combined Sewer Overflow Public Notification Plan, ESDPW contacted the Douglas County Department of Health & Human Services to obtain their advice regarding potentially impacted public access areas and overflow notification procedures. The Health Officer of the Douglas County Department of Health & Human Services was consulted on this plan, and will be the party contacted as part of the plan. Information was provided by the Douglas County Department of Health & Human Services Environmental Health as to public access locations and water monitoring.

The City of Superior and the City of Duluth, Minnesota are located in close proximity to each other, sharing borders with two waterbodies that may receive combined sewer overflow discharges: the St. Louis River and Superior Bay. The Director of Public Works and Utilities of the City of Duluth was consulted on the plan, and will be the party contacted as part of the plan.

Superior Water Light & Power (SWLP) is the drinking water utility for the City of Superior. SWLP will continue to be contacted in the event of any combined sewer overflows. SWLP also provided information on the location of the water supply intake for the City of Superior.

SECTION 4 – POTENTIALLY IMPACTED PUBLIC ACCESS AREAS

4.1 Introduction

This section identifies surface water public access areas within the combined sewer areas. Although a potential exists for combined sewer overflows to affect these areas, combined sewer overflows are only one of many factors that affect water quality. The identification of a public access area in this section does not imply that combined sewer overflows are the actual cause of any specific water quality impairments at these locations at any specific time. The following documents provide detailed information regarding water quality and how pollutant loads from combined sewer overflows relate to pollutant loads from other sources.

St. Louis River 2018 Remedial Action Plan https://dnr.wi.gov/topic/GreatLakes/documents/SLR2018RAPFinal.pdf

2010 Water Quality Management Plan Update for the St. Louis and Lower

Nemadji River Watershed https://dnr.wi.gov/topic/watersheds/documents/basins/superior/LS01Wtplan.p df

Figures 4.1, 4.2, 4.3, and 4.4 show the water supply intakes, beaches, and recreational boat launches within the combined sewer area.

4.2. Water Supply Intakes

Superior Water, Light & Power (a privately owned company) has one water supply intake in Lake Superior near the combined sewer area. However, the intake is 300 feet off Minnesota Point and ten to twelve feet beneath the floor of the lake.

Contact: Superior Water, Light & Power, 715‐394‐2200

4.3. Beaches

The City of Superior operates one beach near a combined sewer area: Barker’s Island Inner Beach. Weekly during swimming season, the Lake Superior Research Institute (LSRI) monitors the site for E. Coli and reports the results to Douglas County Department of Health & Human Services, Environmental Health; the department then provides water quality advice to beach users. Testing results are available online:

www.wibeaches.us

Contact: Douglas County Department of Health & Human Services, Environmental Health, 715‐395‐1304

4.4. Recreational Boat Launches

Four sites for boat launching are within or near the combined sewer area. The Douglas County Department of Health & Human Services, Environmental Health does not routinely monitor these sites.

Table 4.1 Boat Launch Sites

Waterway Launch Site

St. Louis River Arrowhead Public Boat Launch

Nemadji River East 5th Street, Old 11 Road, Grand Avenue

Contact: Douglas County Department of Health & Human Services, Environmental Health, 715‐395‐1304

E 2ND STE 5TH ST

E 4TH ST

HI

LL

A V

E 3RD ST

E 6TH ST

E 8TH STE 10TH ST

E 7TH ST

22N

D AV E

24T

H AV E

E 11TH ST

N 28TH ST E

N 21ST ST E

MARINA DR

CE

DA

R

AV

15T

H AV E

E ST

4T

H AV E

26T

H AV E

6T

H AV E

18T

H AV E

27T

H AV E

3R

D AV E

BA

RD

ON

A

V

BELKNAP ST

F S T

TH AV E

14T

H AV E

E 1ST ST

16T

H AV E

TH AV E

19T

H AV E

28T

H AV E

TH AV E

N 25TH ST E

29T

H AV E

VOGEL ST

MAPLE AV

TH

AV

E

23R

D AV E

NORWOOD AV

2N

D AV E

LAUREL AV

LENROOT HWY

17T

H AV E

N 24TH ST

30T

H AV E

E 12TH ST

E 9TH ST

MARINA DR

23R

D AV E

E 8TH ST

E 7TH ST

HILL AV

17T

H AV E

SWL&P Water Treatment Facility

Pump Station

Well Screens (Approx)

Water Intake Facilities 0 1,000 2,000500 Ft F Date: 1/28/2019A N A L L E T E C O M P A N Y

TMSWLP&

COS Wastewater Treatment Facility abramsone Typewritten Text Figure 4.1: Water Supply Intake Location abramsone Typewritten Text

Figure 4.2: City of Superior Beach Location

Figure 4.3: St. Louis River Boat Launch Location

Figure 4.4: Nemadji River Boat Launch Locations

Combined sewer overflows only occur when the water elevation of the basins at the auxiliary treatment facilities is greater than the elevation of the overflow mechanism at the facility. Table 5.1 includes information on the capacity of the basins at each facility, along with the overflow type.

Table 5.1 Auxiliary Treatment Facility Basin Capacity and Overflow Type

Location Basin Capacity Overflow Type

CSTP 2 18 MG Overflow Spillway

CSTP 5 6.5 MG Overflow Weir and Piping

CSTP 6 13 MG Overflow Spillway

Elevations within the basins are continuously monitored, and are used to determine when the facility will be run, among other processes system‐wide. Additionally, for the two remote facilities at CSTP 5 and CSTP 6, closed‐circuit televised video is available real‐time to monitor the levels in the basin. When the level of the basin is to a certain threshold, ESDPW staff will be sent to the facility to monitor in the event of a combined sewer overflow occurring at the location. In the event of an overflow, ESDPW staff will complete the information contained in the City of Superior Combined Sewer Overflow Data Sheet, included in Appendix B. Overflow volume calculations are described for each facility below.

5.1. CSTP 2 Overflow Calculations

Overflows at CSTP 2 are calculated as a trapezoidal open channel, with flow, Q, calculated by:

𝑄 𝑉 ∗ 𝐴

𝑉 𝑘 𝑛

𝑅 𝑆

𝑅 𝐴 𝑃 𝑦 𝑏 𝑇

𝑃 𝑏 𝑦 1 𝑧 1 𝑧

𝑇 𝑏 𝑦 𝑧 𝑧

𝐹 𝑉 𝑇 𝑔𝐴𝑐𝑜𝑠𝜃 𝜃 tan 𝑆 𝑘 1.0 𝑓𝑜𝑟 𝑚𝑒𝑡𝑟𝑖𝑐; 𝑘 1.49 𝑓𝑜𝑟 𝐸𝑛𝑔𝑙𝑖𝑠ℎ

Where 𝑧 = Side slope of bank 1 (value = 15) 𝑧 = Side slope of bank 2 (value = 15) b = Bottom width of channel (ft) (value = 100) S = Channel slope (ft/ft) (value = 0.01) n = Manning roughness coefficient (value = 0.023) g = Gravity constant (ft/s^2) (value = 32.174) y = Measured water height (ft) (variable)

Water height, y, is measured at the overflow spillway at the time the initial grab samples are taken, and then every 4‐6 hours until the overflow has stopped. y is determined by the water elevation above ground level at the overflow spillway.

Total overflow volume is estimated using an Excel spreadsheet located at \\ESDFILESERVER\Shared Info\Overflow Calculations. The initial value for calculation shall have H = 1/16” and T = the date and time of the start of the overflow. Physical height and time measurements are entered in subsequent columns. The final values in the spreadsheet will indicate the end of the overflow, where H = 0 and T = the date and time of the end of the overflow.

5.2. CSTP 5 Overflow Calculations

Overflows at CSTP 5 are calculated as a broad crested weir, with flow, Q, calculated by:

Q = C * L * H^1.5

C = discharge coefficient (value = 3.09), L = weir length (ft) (value = 6), and H = measured water height (ft)

Water height, H, is measured at the overflow weir at the time the initial grab samples are taken, and then every 4‐6 hours until the overflow has stopped. H is determined by the elevation of the stagnant water behind the weir, as shown in Figure 5.1.

Figure 5.1 Broad Crested Weir Measured Water Height, H shall have H = 1/16” and T = the date and time of the start of the overflow. Physical height and time measurements are entered in subsequent columns. The final values in the spreadsheet will indicate the end of the overflow, where H = 0 and T = the date and time of the end of the overflow.

5.3 CSTP 6 Overflow Calculations

Overflows at CSTP 6 are calculated as a trapezoidal open channel, with flow, Q, calculated by:

𝑄 𝑉 ∗ 𝐴

𝑉 𝑘 𝑛

𝑅 𝑆

𝑅

𝑃 𝑦 𝑏 𝑇

𝑃 𝑏 𝑦 1 𝑧 1 𝑧

𝑇 𝑏 𝑦 𝑧 𝑧

𝐹 𝑉 𝑇 𝑔𝐴𝑐𝑜𝑠𝜃 𝜃 tan 𝑆 𝑘 1.0 𝑓𝑜𝑟 𝑚𝑒𝑡𝑟𝑖𝑐; 𝑘 1.49 𝑓𝑜𝑟 𝐸𝑛𝑔𝑙𝑖𝑠ℎ 𝑧 = Side slope of bank 1 (value = 3) 𝑧 = Side slope of bank 2 (value = 3) b = Bottom width of channel (ft) (value = 8) S = Channel slope (ft/ft) (value = 0.0095) n = Manning roughness coefficient (value = 0.025) g = Gravity constant (ft/s^2) (value = 32.174) y = Measured water height (ft) (variable)

Water height, y, is measured at the overflow spillway at the time the initial grab samples are taken, and then every 4‐6 hours until the overflow has stopped. y is determined by the water elevation above ground level near the baffle weir at the basin end of the spillway.

shall have H = 1/16” and T = the date and time of the start of the overflow. Physical height and time measurements are entered in subsequent columns. The final values in the spreadsheet will indicate the end of the overflow, where H = 0 and T = the date and time of the end of the overflow.

SECTION 6 – NOTICE TO GOVERNMENTS AND OTHER ENTITIES

6.1. Introduction

For combined sewer overflow events, ESDPW will provide various notices to other governments, including: notices to the Department of Natural Resources, as required by the City’s WPDES permit; notice to the local water utility; notices to local media outlets;

and the four‐hour and seven‐day notices required by the new regulations in 40 CFR 122.38(a)(2). Of the notices listed, the four‐hour and seven‐day notices are new.

6.2. Reports to the Department of Natural Resources

The City’s WPDES permit requires notices to the Department of Natural Resources as soon as practicable, but no later than 24 hours from the time ESDPW becomes aware of the overflow per NR 210.21 (4)(a). ESDPW then prepares and delivers to the local WDNR representative, no later than five days from the time that ESDPW becomes aware of the cessation of the overflow, the information identified in NR 210.21 (4)(b) using the city form number 3400‐184C.

6.3. Notice to the Local Drinking Water Utility

Drinking water utility notification must be made within 24 hours of identification of event.

Contact information for the drinking water utility, Superior Water Light & Power, is included in Appendix A. The information included in the notification shall be:

A. Date and time the overflow commenced or was identified, B. Whether the discharge is continuing, C. Location of the overflow, D. Receiving water, and E. Special contaminant concerns.

6.4. Notice to Local Media Outlets

A press release is provided by ESDPW to City of Superior’s Mayor’s office (Mayor and Chief of Staff to the Mayor) as well as Director of Public Works for approval prior to release to Superior Telegram. The press release will be made prior to the submittal of the Department of Natural Resources five‐day reporting bypass notification. The information to include in the press release shall be:

A. Date and time the overflow commenced or was identified, B. Location and receiving water of the overflow, C. Whether the discharge is continuing, D. Whether the overflow was caused by a wet weather event, E. Whether the overflow received a basic level of treatment by floatables removal and settling of solids, F. Notification of the Department of Natural Resources, and G. The website address for public notification of the event.

6.5. Four‐Hour Notice

Within four hours of becoming aware of a combined sewer overflow, 40 CFR 122.38(a)(2)(i) requires the ESDPW to provide notice to the health department and other potentially affected public entities. For the City of Superior, the relevant entities are the Douglas County Department of Health & Human Services and the City of Duluth, Minnesota Public Works and Utilities. This notice will be via email and will refer the entities to the Public Notification website; see Section 7 for information on the Public Notification website.

6.6. Seven‐Day Notice

Within seven days of becoming aware that the combined sewer overflow has ended, the entities contacted with the four‐hour notice shall be contacted with updated information per 40 CFR 122.38(a)(2)(ii). Notification of the updated Public Notification website will be sent via email; see Section 7 for information on the Public Notification website.

SECTION 7 – PUBLIC NOTICE

7.1. Introduction

In addition to the notification to the public via the Superior Telegram, the City of Superior will maintain a website for notification of combined sewer overflows. The information on this website will be updated by ESDPW staff per the below procedures.

7.2. Four‐Hour Notice Procedure

Within four hours of becoming aware of a combined sewer overflow, ESDPW will post on the Public Notification website at https://www.ci.superior.wi.us/902/Combined‐ Sewer‐Overflows the following information:

A. The receiving water, B. The discharge location, C. Potentially impacted public access areas, D. The date and time the discharge commenced or was identified, and

E. Whether the discharge is continuing.

7.3. Seven‐Day Notice Procedure

Within seven days after the conclusion of a combined sewer overflow, ESDPW will update the Public Notification website at https://www.ci.superior.wi.us/902/Combined‐ Sewer‐Overflows with the following information:

A. The receiving water, B. The discharge location, C. Potentially impacted public access areas, D. The date and time the discharge commenced or was identified, E. The ending date and time, and

F. Estimated discharge volumes by location.

SECTION 8 – ANNUAL REPORT

No later than May 1 of each year, ESDPW will prepare a report summarizing combined sewer overflows in the preceding calendar year. This report will include:

1. The location and receiving water for each combined sewer overflow location;

2. For each combined sewer overflow event:

a. Location,

b. Date,

c. Starting time,

d. Duration,

e. Estimated volume, and

f. Cause;

3. A summary of any overflow monitoring data, such as the name of the location where sampling occurred and the water quality parameters analyzed;

4. Potentially impacted public access areas;

5. Precipitation data for each overflow caused by wet weather;

6. A summary of actions taken to reduce overflows. The report will note the implementation of the nine minimum controls and a long‐term control plan in progress;

7. Any changes to overflow locations or public notification procedures since the previous report; and

8. The name, title, telephone number and email address of an ESDPW contact person.

ESDPW will email this report to npdes_cso@epa.gov and to the Wisconsin Department of Natural Resources. ESDPW will provide it to others upon request. ESDPW will make this report available on the City of Superior’s Public Notification website.

APPENDICES

APPENDIX A – TABLE OF CONTACTS

APPENDIX B – COMBINED SEWER OVERFLOW DATA SHEET

APPENDIX A – TABLE OF CONTACTS

OFFICE

Plant: 715‐394‐0392 Fax: 715‐394‐0406

ESDPW STAFF

Jon Shamla Wastewater Treatment Engineering &

Operations Manager

Plant: (715) 394‐0392 x 1008 shamlaj@ci.superior.wi.us

Erin Abramson Collection Systems Engineering & Operations Manager

Plant: (715) 394‐0392 x 1015 abramsone@ci.superior.wi.u s

Joe Van Overmeiren Collection System Working Foreman Plant: (715) 394‐0392 x 1037

Keith Yadon Operations Working Foreman Plant: (715) 394‐0392 x 1045

Steve Roberts Environmental Services Director Plant: (715) 394‐0392 x 1034 robertss@ci.superior.wi.us

Diane Nelson Stormwater and Administrative Manager Plant: (715) 394‐0392 x 1031 nelsond@ci.superior.wi.us

CITY OF SUPERIOR GOVERNMENT & DEPARTMENTS

Jim Paine Mayor‐ City of Superior (715) 395‐7212 painej@ci.superior.wi.us

Rani Gill Chief of Staff to the Mayor (715) 395‐7212 ranig@ci.superior.wi.us

Todd Janigo Public Works Director (715) 395‐7373 janigot@ci.superior.wi.us

PUBLIC HEALTH DEPARTMENT & OTHER PUBLIC ENTITIES

Kathy Ronchi Health Officer, Douglas County Department of Health & Human Services

(715) 395‐1494 Kathy.Ronchi@douglascount ywi.org

Jim Benning Public Works & Utilities Director, City of Duluth, Minnesota

(218) 730‐5105 jbenning@duluthmn.gov

REGULATORY – STATE OF WISCONSIN

Eric de Venecia, P.E. Wisconsin Department of Natural

Resources; Environmental Engineer – Water Quality Bureau

(715) 685‐4155 eric.devenecia@Wisconsin.g ov

WATER UTILITY

Kris Coggan Superior Water, Light & Power (SWLP) (218) 394‐2200 kcoggin@swlp.com

Don Vollmer Superior Water, Light & Power (SWLP) (218) 394‐2200 or

(715) 398‐4421

DVollmer@swlp.com

MEDIA NOTIFICATION

Shelly Nelson Superior Telegram (715) 395‐5022 snelson@superiortelegram.c om

APPENDIX B – COMBINED SEWER OVERFLOW DATA SHEET