Permit Fact Sheet General Information · 7/7/2020 · Notes (NH3-N) Total Prop Comp through September. Nitrogen, Ammonia (NH3-N) Total Monthly Avg 3.2 mg/L 5/Week 24-Hr Flow Prop

Page 1 of 18

Permit Fact Sheet

General Information

Permit Number: WI-0032026-09-0

Permittee Name: Delafield-Hartland Water Pollution Control Commission

Address: 416 Butler Drive, Delafield, WI, 53018-1871

City/State/Zip: Delafield, WI 53018-1871

Discharge Location: East bank of the Bark River, 1 mile south of the Genesee Lake Road bridge, in the Village of

Summit. (Lat: 43.03286 N, Long: 88.45058W)

Receiving Water: Bark River (Bark River Watershed, Lower Rock River Basin) in Waukesha County. The Rock

River, approximately 30 miles downstream of the outfall, is listed as impaired for total

phosphorus and low dissolved oxygen.

StreamFlow (Q7,10): 10 cfs

Stream

Classification:

Warm water sport fishery; non-public water supply

Design Flow(s) Daily Maximum 6.54 MGD

Weekly Maximum 3.87 MGD

Monthly Maximum 3.38 MGD

Annual Average 3.23 MGD

Significant Industrial

Loading?

No

Operator at Proper

Grade?

Yes. Plant is rated as an Advanced facility with subclasses A1, B, C, P, D and SS.

Approved

Pretreatment

Program?

N/A

Facility Description

Delafield-Hartland owns and operates a 3.23 MGD extended aeration activated sludge plant, which commenced operation

in May 2004. Delafield-Hartland is a regional facility and serves a population of approximately 20,600 residents from the

City of Delafield, Town of Delafield, and the Villages of Hartland, Nashotah, and Summit. The service area is 100%

separate sewer collection system. Treatment processes include bar screening and grit removal, primary clarification,

extended aeration activated sludge treatment, final clarification, and sand filtration. Seasonal disinfection is achieved

through ultraviolet (UV) disinfection. Effluent is pumped via force main and discharged into the Bark River at a point

approximately four miles southwest of the wastewater treatment plant. Delafield-Hartland operates a temperature phased

anaerobic digestion (TPAD) system and generates Class B biosolids. Delafield-Hartland plans to install disc filters to

meet the final phosphorus limits. The Department has found the facility to be in substantial compliance with the current

permit.

Page 2 of 18

Sample Point Designation

Sample

Point

Number

Discharge Flow, Units, and

Averaging Period

Sample Point Location, Waste Type/sample Contents and

Treatment Description (as applicable)

701 Flow 1.99 MGD; TSS 257.28

mg/L; BOD5 248.51 mg/L (All

January 2015 through May 2019)

INFLUENT: 24-hour flow proportional composite samples shall be

collected prior to grit removal and after the bar screen.

001 Flow 1.89 MGD; TSS 0.47 mg/L;

BOD5 2.0 mg/L (All January 2015

through May 2019)

EFFLUENT: 24-hour flow proportional composite samples shall be

collected from the sand filter effluent channel. Grab samples shall be

collected after disinfection.

002 N/A OUTFALL INACTIVE: Anaerobically digested, Class B liquid

sludge. Samples shall be collected from the recirculation pump

directly after the mesophilic digester, post process.

(PLACEHOLDER) Department approval to activate Outfall 002 must

be received prior to use.

006 460 dry U.S. tons (per 2019

application)

Anaerobically digested, belt press thickened, Class B cake sludge.

Representative samples shall be collected from the sludge drying beds

and composited.

101 N/A FIELD BLANK: Collect mercury field blank using standard sample

handling procedures.

1 Influent - Proposed Monitoring

1.1 Sample Point Number: 701- INFLUENT TO PLANT

Monitoring Requirements and Limitations

Parameter Limit Type Limit and

Units

Sample

Frequency

Sample

Type

Notes

Flow Rate MGD Daily Continuous

BOD5, Total mg/L Daily 24-Hr Flow

Prop Comp

Suspended Solids,

Total

mg/L Daily 24-Hr Flow

Prop Comp

Mercury, Total

Recoverable

ng/L Quarterly 24-Hr Flow

Prop Comp

See 'Mercury Monitoring'

section in permit.

1.1.1 Changes from Previous Permit:

Flow Rate: The sample frequency was updated from “Continuous” to “Daily” for eDMR reporting consistency.

1.1.2 Explanation of Limits and Monitoring Requirements

BOD5 and Total Suspended Solids: Tracking of BOD5 and Total Suspended Solids are required for percent removal

requirements found in s. NR 210.05, Wis. Adm. Code and in the ‘Standard Requirements’ section of the permit.

Page 3 of 18

Total Recoverable Mercury: Mercury monitoring is included in the proposed permit pursuant to s. NR 106.145, Wis.

Adm. Code. Required field blanks for Mercury monitoring are included per ss. NR 106.145 (9) and (10), Wis. Adm.

Code, requirements. The permittee shall collect a mercury field blank for each set of mercury samples (a set of samples

may include a combination of influent, effluent or other samples all collected on the same day). The permittee shall report

results of influent and effluent samples and field blanks to the Department on Discharge Monitoring Reports.

2 Inplant - Proposed Monitoring and Limitations

2.1 Sample Point Number: 101- Mercury Effluent Blanks



Units

Sample

Frequency

Sample

Type

Notes

Mercury, Total

Recoverable

ng/L Quarterly Blank See 'Mercury Monitoring'

section in permit.


Sample type was updated from “Grab” to “Blank” to more accurately describe the type of sample being collected.


Mercury monitoring is included in the proposed permit pursuant to s. NR 106.145, Wis. Adm. Code. Required field

blanks for Mercury monitoring are included per ss. NR 106.145(9) and (10), Wis. Adm. Code, requirements. The

permittee shall collect a mercury field blank for each set of mercury samples (a set of samples may include a combination

of influent, effluent or other samples all collected on the same day). The permittee shall report results of influent and

effluent samples and field blanks to the Department on Discharge Monitoring Reports.

3 Surface Water - Proposed Monitoring and Limitations

3.1 Sample Point Number: 001- EFFLUENT



Units

Sample

Frequency

Sample

Type

Notes

Flow Rate MGD Daily Continuous

BOD5, Total Weekly Avg 12 mg/L Daily 24-Hr Comp Limit effective November

through April.

BOD5, Total Weekly Avg 7.0 mg/L Daily 24-Hr Comp Limit effective May

through October.

BOD5, Total Monthly Avg 12 mg/L Daily 24-Hr Comp Limit effective November

through April.

BOD5, Total Monthly Avg 7.0 mg/L Daily 24-Hr Comp Limit effective May

through October.

Page 4 of 18



Units

Sample

Frequency

Sample

Type

Notes

BOD5, Total Weekly Avg 302 lbs/day Daily Calculated Limit effective November

through April.

Suspended Solids,

Total

Weekly Avg 14 mg/L Daily 24-Hr Comp Limit effective November

through April.

Suspended Solids,

Total

Weekly Avg 10 mg/L Daily 24-Hr Comp Limit effective May

through October.

Suspended Solids,

Total

Monthly Avg 14 mg/L Daily 24-Hr Comp Limit effective November

through April.

Suspended Solids,

Total

Monthly Avg 10 mg/L Daily 24-Hr Comp Limit effective May

through October.

Suspended Solids,

Total

Weekly Avg 278 lbs/day Daily Calculated Effective January annually.

Suspended Solids,

Total

Weekly Avg 324 lbs/day Daily Calculated Effective February

annually.

Suspended Solids,

Total

Weekly Avg 305 lbs/day Daily Calculated Effective March annually.

Suspended Solids,

Total

Weekly Avg 259 lbs/day Daily Calculated Effective April annually.

Suspended Solids,

Total

Weekly Avg 212 lbs/day Daily Calculated Effective May annually.

Suspended Solids,

Total

Weekly Avg 222 lbs/day Daily Calculated Effective June annually.

Suspended Solids,

Total

Weekly Avg 167 lbs/day Daily Calculated Effective July annually.

Suspended Solids,

Total

Weekly Avg 157 lbs/day Daily Calculated Effective August and

October annually.

Suspended Solids,

Total

Weekly Avg 130 lbs/day Daily Calculated Effective September

annually.

Suspended Solids,

Total

Weekly Avg 250 lbs/day Daily Calculated Effective November

annually.

Suspended Solids,

Total

Weekly Avg 286 lbs/day Daily Calculated Effective December

annually.

Suspended Solids,

Total

Monthly Avg 226 lbs/day Daily Calculated Effective January annually.

Suspended Solids,

Total

Monthly Avg 264 lbs/day Daily Calculated Effective February

annually.

Page 5 of 18



Units

Sample

Frequency

Sample

Type

Notes

Suspended Solids,

Total

Monthly Avg 248 lbs/day Daily Calculated Effective March annually.

Suspended Solids,

Total

Monthly Avg 211 lbs/day Daily Calculated Effective April annually.

Suspended Solids,

Total

Monthly Avg 173 lbs/day Daily Calculated Effective May annually.

Suspended Solids,

Total

Monthly Avg 181 lbs/day Daily Calculated Effective June annually.

Suspended Solids,

Total

Monthly Avg 135 lbs/day Daily Calculated Effective July annually.

Suspended Solids,

Total

Monthly Avg 128 lbs/day Daily Calculated Effective August and

October annually.

Suspended Solids,

Total

Monthly Avg 105 lbs/day Daily Calculated Effective September

annually.

Suspended Solids,

Total

Monthly Avg 203 lbs/day Daily Calculated Effective November

annually.

Suspended Solids,

Total

Monthly Avg 233 lbs/day Daily Calculated Effective December

annually.

pH Field Daily Min 6.0 su Daily Grab

pH Field Daily Max 9.0 su Daily Grab

Dissolved Oxygen Daily Min 7.0 mg/L Daily Grab

Nitrogen, Ammonia

(NH3-N) Total

Daily Max 29 mg/L 5/Week 24-Hr Flow

Prop Comp

Limit effective November

through April.

Nitrogen, Ammonia

(NH3-N) Total

Weekly Avg 11.4 mg/L 5/Week 24-Hr Flow

Prop Comp


through March.

Nitrogen, Ammonia

(NH3-N) Total


Prop Comp

Limit effective in April.

Nitrogen, Ammonia

(NH3-N) Total


Prop Comp

Limit effective May-

September.

Nitrogen, Ammonia

(NH3-N) Total


Prop Comp

Limit effective in October.

Nitrogen, Ammonia

(NH3-N) Total

Monthly Avg 5.2 mg/L 5/Week 24-Hr Flow

Prop Comp


through March.

Nitrogen, Ammonia

(NH3-N) Total


Prop Comp

Limit effective in April.

Nitrogen, Ammonia Monthly Avg 2.1 mg/L 5/Week 24-Hr Flow Limit effective May

Page 6 of 18



Units

Sample

Frequency

Sample

Type

Notes

(NH3-N) Total Prop Comp through September.

Nitrogen, Ammonia

(NH3-N) Total


Prop Comp

Limit effective in October.

Fecal Coliform Geometric

Mean - Wkly

400 #/100 ml Weekly Grab Interim limit effective May

through September

annually until the final E.

coli limit goes into effect

per the ‘Effluent

Limitations for E. coli’

Schedule.

E. coli #/100 ml Weekly Grab Monitoring only May

through September

annually until the final limit

goes into effect per the

‘Effluent Limitations for E.

coli’ Schedule.

E. coli Geometric

Mean –

Monthly

126 #/100 ml Weekly Grab Limit effective May

through September

annually per the ‘Effluent


Schedule.

E. coli % Exceedance 10 Percent Monthly Calculated Limit effective May

through September

annually per the ‘Effluent


Schedule. See the ‘E. coli

Percent Limit’ section in

permit. Enter the result in

the DMR on the last day of

the month.

Chloride mg/L 4/Month 24-Hr Flow

Prop Comp

Sampling shall be

conducted on four

consecutive days each

month. See ‘Chloride SRM’

section and ‘Schedules’

section in permit.

Chloride lbs/day 4/Month Calculated Chloride mass discharge

shall be calculated using the

daily concentration (mg/L)

x daily flow (MGD) x 8.34.

See Chloride subsection in

permit.

Page 7 of 18



Units

Sample

Frequency

Sample

Type

Notes

Mercury, Total

Recoverable

ng/L Quarterly Grab See 'Mercury Monitoring'

section in permit.

Phosphorus, Total Monthly Avg 1.0 mg/L 5/Week 24-Hr Flow

Prop Comp

This is an interim limit

effective immediately upon

permit reissuance. Final

limits become effective

September 1, 2023.

Phosphorus, Total Monthly Avg 4.19 lbs/day 5/Week Calculated Effective January and

December annually. Limit

becomes effective

December 1, 2023.

Phosphorus, Total Monthly Avg 7.08 lbs/day 5/Week Calculated Effective February

annually. Limit becomes

effective February 1, 2024.

Phosphorus, Total Monthly Avg 6.7 lbs/day 5/Week Calculated Effective March annually.

Limit becomes effective

March 1, 2024.

Phosphorus, Total Monthly Avg 8.58 lbs/day 5/Week Calculated Effective April annually.


April 1, 2024.

Phosphorus, Total Monthly Avg 7.33 lbs/day 5/Week Calculated Effective May annually.


May 1, 2024.

Phosphorus, Total Monthly Avg 7.52 lbs/day 5/Week Calculated Effective June annually.


June 1, 2024.

Phosphorus, Total Monthly Avg 5.68 lbs/day 5/Week Calculated Effective July annually.


July 1, 2024.

Phosphorus, Total Monthly Avg 4.97 lbs/day 5/Week Calculated Effective August annually.


August 1, 2024.

Phosphorus, Total Monthly Avg 4.08 lbs/day 5/Week Calculated Effective September


effective September 1,

2023.

Phosphorus, Total Monthly Avg 3.22 lbs/day 5/Week Calculated Effective October annually.


October 1, 2023.

Phosphorus, Total Monthly Avg 3.47 lbs/day 5/Week Calculated Effective November

Page 8 of 18



Units

Sample

Frequency

Sample

Type

Notes


effective November 1,

2023.

Nitrogen, Nitrite +

Nitrate Total

mg/L Quarterly 24-Hr Flow

Prop Comp

Nitrogen, Total

Kjeldahl

mg/L Quarterly 24-Hr Flow

Prop Comp

Nitrogen, Total mg/L Quarterly Calculated Total Nitrogen shall be

calculated as the sum of

reported values for Total

Kjeldahl Nitrogen and

Total Nitrite + Nitrate

Nitrogen.

Acute WET TUa See Listed

Qtr(s)

24-Hr Flow

Prop Comp

Annually in rotating

quarters. See 'WET' section

in permit.

Chronic WET Monthly Avg 1.5 TUc See Listed

Qtr(s)

24-Hr Flow

Prop Comp

Annually in rotating

quarters. See 'WET' section

in permit.

3.1.1 Changes from Previous Permit

Flow Rate: The sample frequency was changed from “Continuous” to “Daily” to achieve eDMR reporting consistency.

Fecal Coliform and E. coli: Previous fecal coliform monitoring and limits have been replaced with Escherichia coli (E.

coli) monitoring and limits. An interim fecal coliform limit of 400#/100 ml as a monthly geometric mean was added to the

proposed permit. Final E. coli limits of 126#/100 ml as a monthly geometric mean and 410#/100 ml as a daily maximum

(not to be exceeded more than 10 percent of the time in any calendar year) were also added to the proposed permit and

become effective per a schedule.

Chloride: Delafield-Hartland WPCC no longer requires a chloride variance, so the weekly average variance interim limit

of 615 mg/L was removed and chloride mass (lbs/day) reporting requirements were added to the proposed permit.

Monitoring 4 times per month on consecutive days is still required.

Total Residual Chlorine: The daily maximum limit of 38 ug/L and weekly average limit of 8.6 ug/L were removed from

the proposed permit.

WET: A chronic WET limit of 2.3 TUc was added to the proposed permit.


Categorical Limits

• BOD5, Total Suspended Solids, pH, and Dissolved Oxygen: Standard municipal wastewater requirements for

BOD5, total suspended solids, dissolved oxygen, and pH are included based on Ch. NR 210, Wis. Adm. Code

‘Sewage Treatment Works’ requirements for discharges to fish and aquatic life streams. Chapter NR 102, Wis.

Page 9 of 18

Adm. Code ‘Water Quality Standards for Surface Waters’ also specifies requirements for pH for fish and aquatic

life streams.

Water Quality Based Limits, WET Requirements, and Disinfection

Refer to the following document used for this reissuance: “Updated Water Quality-Based Effluent Limitations for the

Delafield Hartland Water Pollution Control Commission Using Updated Receiving Water Flow Rates”, dated May 20,

2020 and prepared by Nicole Krueger.

• E. coli: On May 1, 2020, revisions to chs. NR 102 and NR 210, Wis. Adm. Code, became effective and replace

fecal coliform limits with new Escherichia coli (E. coli) limits for protection of recreation uses. Since the facility

is required to disinfect, the following limits are included in the proposed permit in accordance with s. NR

210.06(2)(a)1, Wis. Adm. Code and take effect per the schedule; a monthly geometric mean of 126#/100 ml and

no more than 10 percent of E. coli bacteria samples collected in any calendar month may exceed 410 #/100ml.

• Total Ammonia Nitrogen: Current acute and chronic ammonia toxicity criteria for the protection of aquatic life

are included in Table 2C and Table 4B of Ch. NR 105, Wis. Adm. Code (effective March 1, 2004). Subchapter

IV of Ch. NR 106, Wis. Adm. Code, establishes procedures for calculating water quality-based effluent

limitations for ammonia (effective March 1, 2004). Daily maximum, weekly average, and monthly average

ammonia limits are retained in the proposed permit.

• Total Residual Chlorine: The daily maximum limit of 38 ug/L and weekly average limit of 8.6 ug/L was

removed from proposed permit because chlorine is no longer used as a disinfectant during the months of May

through September. An ultraviolet disinfection system was installed in April 2020 and is now fully operational.

Because chlorine is no longer used as part of facility operation, the requirement for chlorine limits to assure

proper operation of the dichlorination system per s. NR 210.06(2)(b), Wis. Adm. Code, is no longer applicable.

• Chloride: Acute and chronic chloride toxicity criteria for the protection of aquatic life are included in Tables 1

and 5 of Ch. NR 105, Wis. Adm. Code. Subchapter IV of Ch. NR 106, Wis. Adm. Code, establishes the procedure

for calculating WQBELs for chloride.

The previous permit included a chloride variance approved by EPA, including an interim limit and required

implementation of source reduction measures. Since the last permit reissuance, the facility completed a mixing

zone study and received updated receiving water flow rates from the United States Geological Survey (USGS)

that demonstrate a higher annual 7-Q10 than previously known. Using these updated factors results in a calculated

daily maximum WQBEL for chloride of 1,514 mg/L and a weekly average WQBEL of 757 mg/L. Data collected

during the current permit term (01/01/2015 to 05/31/2019) generate a 1-day P99 chloride concentration of 657

mg/L, and a 4 -day P99 of 594 mg/L. Comparison of the 1-day P99 and 4-day P99 to the calculated WQBELs

demonstrate there is no longer reasonable potential for effluent concentrations to exceed recalculated water

quality-based effluent limitations. Therefore, the numeric chloride effluent limitation was replaced with a

narrative standard that requires maintenance of chloride levels at or below current concentrations for purposes of

antidegradation and antibacksliding. An increased loading of chloride beyond current chloride effluent

concentrations may result in the imposition of a water quality-based effluent limitation for chloride and a

demonstration and review under chapter NR 207, Wis. Adm. Code. Based on the analysis provided in the May

20, 2020 WQBEL memo, the 4-day P99 of current chloride concentrations is 594 mg/L. To demonstrate

compliance with the narrative limit, Delafield-Hartland PCC must continue to implement chloride source

reduction measures and monitor effluent chloride concentrations for four consecutive days per month in the

proposed permit.

• Mercury: Representative data shows there is no reasonable potential for Delafield-Hartland to exceed the water

quality-based 1.3 ng/L monthly average limit, therefore no mercury limit is recommended in the proposed permit,

but quarterly mercury monitoring is included. Requirements for mercury are included in s. NR 106.145, Wis.

Adm. Code (effective November 2002).

Page 10 of 18

• Phosphorus: The proposed permit will be Delafield-Hartland’s second permit term under new administrative

rules for phosphorus discharges that took effect December 1, 2010. Details regarding the administrative rules for

phosphorus discharges may be found at: http://dnr.wi.gov/topic/surfacewater/phosphorus.html. The new

phosphorus rules are contained in s. NR 102.06 and Ch. NR 217, Subchapter III, Wis. Adm. Code. Because

Delafield-Hartland discharges in excess of 150 pounds of total phosphorus per month, a 1.0 mg/L technology-

based limit is included in the reissued permit, which also serves as an interim limit. The Rock River TMDL

provides effluent limitations in lbs/month and are calculated as lbs/day as monthly averages in the proposed

permit. See the ‘TMDL Limitations’ section below. Because Delafield-Hartland is unable to achieve the

proposed TMDL limitations based on existing operations, a schedule is continued in the proposed permit. TMDL

phosphorus limitations become effective on September 1, 2023. See the ‘Schedules’ section for further

information.

• Total Nitrogen Monitoring (NO2+NO3, TKN and Total N): The Department has included effluent monitoring

for Total Nitrogen in the permit through the authority under s. 283.55(1)(e), Wis. Stats., which allows the

Department to require the permittee to submit information necessary to identify the type and quantity of any

pollutants discharged from the point source, and through s. NR 200.065(1)(h), Wis. Adm. Code, which allows for

this monitoring to be collected during the permit term. Quarterly effluent monitoring for Total Nitrogen is

included in the permit because of the potential for higher nitrogen loading resulting from higher flows (major

facilities), higher concentrations, or both. More information on the justification to include total nitrogen

monitoring in wastewater permits can be found in the “Guidance for Total Nitrogen Monitoring in Wastewater

Permits” dated October 1, 2019.

• WET: Whole Effluent Toxicity (WET) testing requirements are determined in accordance with ss. NR 106.08

and NR 106.09, Wis. Adm. Code, as revised in August 2016. (See the current version of the Whole Effluent

Toxicity Program Guidance Document and checklist and WET information, guidance and test methods at

http://dnr.wi.gov/topic/wastewater/wet.html). Annual acute and chronic WET tests are scheduled in the following

quarters: October-December 2020, April-June 2021, July-September 2022, January-March 2023, October-

December 2024. Representative data from April 2015 to February 2018 shows a reasonable potential for chronic

WET, based on procedures in s. NR 106.08(6), Wis. Adm. Code. Therefore, a chronic WET limit of 2.3 TUc was

included in the proposed permit.

Total Maximum Daily Load (TMDL) Limitations

• Total Suspended Solids: Waste Load Allocations (WLAs) specified in TMDLs are expressed as WQBELs.

Weekly average and monthly average mass limits for total suspended solids were required to comply with the

Rock River TMDL and were derived consistent with the assumptions and requirements of the EPA-approved

WLAs for the Rock River. Weekly average TSS mass limits decreased slightly from the previous permit, due to a

change in the coefficient of variation that resulted from less variability in data from the previous permit term. A

different multiplication factor was used when calculating the weekly average mass limits based on the monthly

average mass limits. There are no changes to the TSS concentration limits. Since the treatment plant is already

compliant with TMDL mass limits, no compliance schedule is included. The approved total suspended solids

TMDL limits for this permittee are included in the following table, expressed as weekly and monthly average

effluent limits:

Month

Weekly Ave TSS

Effluent Limit

lbs/day

Monthly Ave TSS

Effluent Limit

lbs/day

Jan 278 226

Feb 324 264

March 305 248

April 259 211

http://dnr.wi.gov/topic/surfacewater/phosphorus.html

http://dnr.wi.gov/topic/wastewater/wet.html

Page 11 of 18

May 212 173

June 222 181

July 167 135

Aug 157 128

Sept 130 105

Oct 157 128

Nov 250 203

Dec 286 233

• Total Phosphorus: Waste load allocations specified in TMDLs are expressed as WQBELs. Monthly average

mass limits for total phosphorus were required to comply with the Rock River TMDL and were derived consistent

with the assumptions and requirements of the EPA-approved WLA for the Rock River. The approved TMDL

WLA and limits for Total Phosphorus are included below and become effective on September 1, 2023 per the

phosphorus schedule. See the ‘Schedules’ section for further information.

Month

Monthly Ave Total P

Effluent Limit

lbs/day

Jan 4.19

Feb 7.08

March 6.70

April 8.58

May 7.33

June 7.52

July 5.68

Aug 4.97

Sept 4.08

Oct 3.22

Nov 3.47

Dec 4.19

4 Land Application - Proposed Monitoring and Limitations Municipal Sludge Description

Sample

Point

Sludge Class

(A or B)

Sludge Type

(Liquid or

Cake)

Pathogen

Reduction

Method

Vector

Attraction

Method

Reuse Option Amount

Reused/Disposed

(Dry Tons/Year)

Page 12 of 18

Municipal Sludge Description

Sample

Point

Sludge Class

(A or B)

Sludge Type

(Liquid or

Cake)

Pathogen

Reduction

Method

Vector

Attraction

Method

Reuse Option Amount

Reused/Disposed

(Dry Tons/Year)

002 B Liquid Fecal

Coliform

Fecal Coliform Land

Application

N/A

006 B Cake Fecal

Coliform

Volatile Solids

Reduction

Land

Application

460 dry U.S. tons

Does sludge management demonstrate compliance? Yes

Is additional sludge storage required? No

Is Radium-226 present in the water supply at a level greater than 2 pCi/liter? Yes

If yes, special monitoring and recycling conditions will be included in the permit to track any potential problems in

landapplying sludge from this facility

Is a priority pollutant scan required? No

Priority pollutant scans are required once every 10 years at facilities with design flows between 5 MGD and 40 MGD,

and once every 5 years if design flow is greater than 40 MGD.

4.1 Sample Point Number: 002- Mesophilic Digester- Class B



Units

Sample

Frequency

Sample

Type

Notes

Solids, Total Percent Quarterly Composite

Arsenic Dry Wt Ceiling 75 mg/kg Quarterly Composite

Arsenic Dry Wt High Quality 41 mg/kg Quarterly Composite

Cadmium Dry Wt Ceiling 85 mg/kg Quarterly Composite

Cadmium Dry Wt High Quality 39 mg/kg Quarterly Composite

Copper Dry Wt Ceiling 4,300 mg/kg Quarterly Composite

Copper Dry Wt High Quality 1,500 mg/kg Quarterly Composite

Lead Dry Wt Ceiling 840 mg/kg Quarterly Composite

Lead Dry Wt High Quality 300 mg/kg Quarterly Composite

Mercury Dry Wt Ceiling 57 mg/kg Quarterly Composite

Mercury Dry Wt High Quality 17 mg/kg Quarterly Composite

Molybdenum Dry Wt Ceiling 75 mg/kg Quarterly Composite

Nickel Dry Wt Ceiling 420 mg/kg Quarterly Composite

Nickel Dry Wt High Quality 420 mg/kg Quarterly Composite

Selenium Dry Wt Ceiling 100 mg/kg Quarterly Composite

Page 13 of 18



Units

Sample

Frequency

Sample

Type

Notes

Selenium Dry Wt High Quality 100 mg/kg Quarterly Composite

Zinc Dry Wt Ceiling 7,500 mg/kg Quarterly Composite

Zinc Dry Wt High Quality 2,800 mg/kg Quarterly Composite

Nitrogen, Total

Kjeldahl

Percent Quarterly Composite

Nitrogen, Ammonium

(NH4-N) Total


Phosphorus, Total Percent Quarterly Composite

Phosphorus, Water

Extractable

% of Tot P Quarterly Composite

Potassium, Total

Recoverable


Radium 226 Dry Wt pCi/g Annual Composite

PCB Total Dry Wt Ceiling 50 mg/kg Once Composite Sample once in 2021

PCB Total Dry Wt High Quality 10 mg/kg Once Composite Sample once in 2021


During the permit reapplication process, it was discovered that Delafield-Hartland was not operating at conditions

approved for Class A biosolids as required in Ch. NR 204, Wis. Adm. Code. Therefore, Class A outfalls were removed

from the proposed permit. Should the facility demonstrate compliance with and receive Department approval for Class A

processes in the future, the permit may be modified to include Class A outfalls and associated requirements at that time.


Requirements for land application of municipal sludge are determined in accordance with Ch. NR 204, Wis. Adm. Code.

Ceiling and high-quality limits for metals in sludge are specified in s. NR 204.07(5), Wis. Adm. Code. Requirements for

pathogens are specified in ss. NR 204.07(6) and in NR 204.07 (7), Wis. Adm. Code for vector attraction requirements.

Limitations for PCBs are addressed in s. NR 204.07(3)(k), Wis. Adm. Code. Radium requirements are addressed in s. NR

204.07(3)(n), Wis. Adm. Code. Land application of waste shall be done in accordance with permit conditions and

applicable codes. All land application sites shall be approved prior to their use. To receive a list of approved sites, or to be

notified of potential approvals, contact the WDNR compliance staff.

4.2 Sample Point Number: 006- Cake Sludge- Class B



Units

Sample

Frequency

Sample

Type

Notes

Solids, Total Percent Quarterly Composite

Arsenic Dry Wt Ceiling 75 mg/kg Quarterly Composite

Page 14 of 18



Units

Sample

Frequency

Sample

Type

Notes

Arsenic Dry Wt High Quality 41 mg/kg Quarterly Composite

Cadmium Dry Wt Ceiling 85 mg/kg Quarterly Composite

Cadmium Dry Wt High Quality 39 mg/kg Quarterly Composite

Copper Dry Wt Ceiling 4,300 mg/kg Quarterly Composite

Copper Dry Wt High Quality 1,500 mg/kg Quarterly Composite

Lead Dry Wt Ceiling 840 mg/kg Quarterly Composite

Lead Dry Wt High Quality 300 mg/kg Quarterly Composite

Mercury Dry Wt Ceiling 57 mg/kg Quarterly Composite

Mercury Dry Wt High Quality 17 mg/kg Quarterly Composite

Molybdenum Dry Wt Ceiling 75 mg/kg Quarterly Composite

Nickel Dry Wt Ceiling 420 mg/kg Quarterly Composite

Nickel Dry Wt High Quality 420 mg/kg Quarterly Composite

Selenium Dry Wt Ceiling 100 mg/kg Quarterly Composite

Selenium Dry Wt High Quality 100 mg/kg Quarterly Composite

Zinc Dry Wt Ceiling 7,500 mg/kg Quarterly Composite

Zinc Dry Wt High Quality 2,800 mg/kg Quarterly Composite

Nitrogen, Total

Kjeldahl


Nitrogen, Ammonium

(NH4-N) Total


Phosphorus, Total Percent Quarterly Composite

Phosphorus, Water

Extractable

% of Tot P Quarterly Composite

Potassium, Total

Recoverable


Radium 226 Dry Wt pCi/g Quarterly Composite

PCB Total Dry Wt Ceiling 50 mg/kg Once Composite Once in 2021

PCB Total Dry Wt High Quality 10 mg/kg Once Composite Once in 2021

4.2.1 Changes from Previous Permit

During the permit reapplication process, it was discovered that Delafield-Hartland was not operating at conditions

approved for Class A biosolids as required in Ch. NR 204, Wis. Adm. Code. Therefore, Class A outfalls were removed

from the proposed permit. Should the facility demonstrate compliance with and receive Department approval for Class A

processes in the future, the permit may be modified to include Class A outfalls and associated requirements at that time.

Page 15 of 18


Requirements for land application of municipal sludge are determined in accordance with Ch. NR 204, Wis. Adm. Code.

Ceiling and high-quality limits for metals in sludge are specified in s. NR 204.07(5), Wis. Adm. Code. Requirements for

pathogens are specified in ss. NR 204.07(6) and in NR 204.07 (7), Wis. Adm. Code for vector attraction requirements.

Limitations for PCBs are addressed in s. NR 204.07(3)(k), Wis. Adm. Code. Radium requirements are addressed in s. NR

204.07(3)(n), Wis. Adm. Code. All land application sites shall be approved prior to their use. To receive a list of approved

sites, or to be notified of potential approvals, contact the WDNR compliance staff.

5 Schedules

5.1 Water Quality Based Effluent Limits (WQBELs) for Total Phosphorus The permittee shall comply with the WQBELs for Phosphorus as specified. No later than 14 days following each

compliance date, the permittee shall notify the Department in writing of its compliance or noncompliance. If a submittal is

required, a timely submittal fulfills the notification requirement.

Required Action Due Date

Construction Upgrade Progress Report #1: The permittee shall submit a progress report on

construction upgrades.

06/30/2021

Construction Upgrade Progress Report #2: The permittee shall submit a progress report on


06/30/2022

Complete Construction: The permittee shall complete construction of wastewater treatment system

upgrades.

06/30/2023

Achieve Compliance: The permittee shall achieve compliance with final phosphorus WQBELs. 09/01/2023

5.1.1 Explanation of Schedule

Subsection NR 217.17, Wis. Adm. Code, allows the department to provide a schedule of compliance for water quality-

based phosphorus limits where the permittee cannot immediately achieve compliance. This schedule requires Delafield-

Hartland to continue to optimize phosphorus removal at the treatment plant and submit progress reports on the status of

achieving compliance with the final water quality-based effluent limits. The schedule is included to provide time for the

permittee to complete actions needed to finance, construct, and install disc filters and additional chemical dosing for

phosphorus removal, and requires that the permittee comply with final water quality-based phosphorus limits as soon as

reasonably possible. The schedule provides 8 years and 9 months from the start date of the original phosphorus schedule

established in the previous permit.

5.2 Effluent Limitations for E. Coli The permittee shall comply with surface water limitations for E. coli as specified. No later than 14 days following each

compliance date, the permittee shall notify the Department in writing of its compliance or noncompliance. If a submittal is

required, a timely submittal fulfills the notification.


Status Update: The permittee shall submit information within the discharge monitoring report

(DMR) comment section documenting the steps taken in preparation for properly monitoring and

testing for E. coli including, but not limited to, selected test method and location of sampling.

11/21/2020

Operational Evaluation Report: The permittee shall prepare and submit an Operational 10/31/2021

Page 16 of 18

Evaluation Report to the Department for review and approval. The report shall include an

evaluation of collected effluent data and proposed operational improvements that will optimize

efficacy of disinfection at the treatment plant during the period prior to complying with the final E.

coli limitations and, to the extent possible, enable compliance with the final E. coli limitations. The

report shall include a plan and schedule for implementation of the operational improvements. These

improvements shall occur as soon as possible, but not later than April 30, 2022. The report shall

state whether the operational improvements are expected to result in compliance with the final E.

coli limitations.

The permittee shall implement the operational improvements in accordance with the approved plan

and schedule specified in the Operational Evaluation Report and in no case later than April 30,

2022.

If the Operational Evaluation Report concludes that the operational improvements are expected to

result in compliance with the final E. coli limitations, the permittee shall comply with the final E.

coli limitations by May 1, 2022 and the permittee is not required to comply with subsequent

milestones identified below in this compliance schedule (‘Submit Facility Plan’, ‘Final Plans and

Specifications’, ‘Treatment Plant Upgrade to Meet Limitations’, ‘Construction Upgrade Progress

Report’, ‘Complete Construction’, ‘Achieve Compliance’)

FACILITY PLAN – If the Operational Evaluation Report concludes that operational improvements

alone are not expected to result in compliance with the final E. coli limitations, the permittee shall

initiate development of a facility plan for meeting final E. coli limitations and comply with the

remaining required actions in this schedule of compliance.

If the Department disagrees with the conclusion of the report, and determines that the permittee can

achieve final E. coli limitations using the existing treatment system with only operational

improvements, the Department may reopen and modify the permit to include an implementation

schedule for achieving the final E. coli limitations sooner than April 30, 2025.

Submit Facility Plan: If the Operational Evaluation Report concluded that the permittee cannot

achieve final E. coli limitations with operational improvements alone, the permittee shall submit in

a Facility Plan per s. NR 110.09, Wis. Adm. Code. The permittee may submit an abbreviated

facility plan if the Department determines that the modifications are minor.

04/30/2022

Final Plans and Specifications: The permittee shall submit final construction plans to the

Department for approval pursuant to ch. NR 108, Wis. Adm. Code, specifying treatment plant

upgrades that must be constructed to achieve compliance with final E. coli limitations and a

schedule for completing construction of the upgrades by the complete construction date specified

below.

03/31/2023

Treatment Plant Upgrade to Meet Limitations: The permittee shall initiate bidding,

procurement, and/or construction of the project. The permittee shall obtain approval of the final

construction plans and schedule from the Department pursuant to s. 281.41, Stats., prior to

initiating activities defined as construction und ch. NR 108, Wis. Adm. Code. Upon approval of the

final construction plans and schedule by the Department pursuant ot s. 281.41, Stats., the permittee

shall construct the treatment plant upgrades in accordance with the approved plans and

specifications.

09/30/2023

Construction Upgrade Progress Report: The permittee shall submit a progress report on


09/30/2024

Complete Construction: The permittee shall complete construction of wastewater treatment

system upgrades.

03/31/2025

Page 17 of 18

Achieve Compliance: The permittee shall achieve compliance with final E. coli limitations. 04/30/2025


A schedule is included in the permit to provide time for the permittee to investigate options for meeting new effluent E.

coli water quality-based effluent limits while coming into compliance with the limits as soon as reasonably possible.

5.3 Chloride Source Reduction Measures


Final Chloride Report: Submit a report summarizing the chloride source reduction measures

implemented during the permit term and the success in maintaining effluent quality at or below the

current concentrations. The report shall include an analysis of trends in weekly, monthly, and annual

average chloride concentrations and total mass discharge of chloride based on chloride sampling and

flow data covering the current permit term. The report shall also include an analysis of how influent

and effluent chloride varies with time and with significant loadings of chloride such as loads from

industries or road salt intrusion into the collection system.

09/30/2024


During the current permit term Delafield-Hartland WPCC had a chloride variance to the calculated water quality standard.

Using updated flow data, chloride limits were calculated, and data shows no reasonable potential for the facility to exceed

the calculated limits. Therefore, the numeric chloride effluent limitation was replaced with a narrative standard that

requires maintenance of chloride levels at or below current concentrations for purposes of antidegradation and

antibacksliding. An increased loading of chloride beyond current chloride effluent concentrations may result in the

imposition of a water quality-based effluent limitation for chloride and a demonstration and review under chapter NR 207.

Delafield-Hartland WPCC must continue to maintain effluent quality at or below the current effluent concentration by

continuing to implement chloride source reduction measures. The schedule requires that a final report be submitted that

indicates which source reduction measures Delafield-Hartland WPCC has implemented during each permit term, and an

analysis of chloride concentration and mass discharge data based on chloride sampling and flow data.

Attachments:

Substantial Compliance Determination, dated August 26, 2019 and prepared by Nick Lent.

Water Quality-Based Effluent Limitations for the Delafield-Hartland Water Pollution Control Commission, dated May 20,

2020 and prepared by Nicole Krueger.

Proposed Expiration Date:

September 30, 2025

Justification Of Any Waivers From Permit Application Requirements

No waivers were given from permit application requirements.

Prepared By:

Page 18 of 18

Lisa Creegan, Wastewater Specialist

Date: June 18, 2020

Revised Date (post fact-check): July 7, 2020

Revised Date (post public notice):

Documents

Permit Fact Sheet General Information · 7/7/2020 · Notes (NH3-N) Total Prop Comp through September. Nitrogen, Ammonia (NH3-N) Total Monthly Avg 3.2 mg/L 5/Week 24-Hr Flow Prop