Plants that Discharge Metal Cleaning Waste to Surface Water or POTW Based on Informati

3/13/2013

Plant Name

EPA 

Region State

PSEG New Haven Harbor Generating Station 1 CT

Algonquin Windsor Locks, LLC 1 CT

West Springfield 1 MA

NextEra Energy Seabrook LLC 1 NH

PSEG Linden Generating Station 2 NJ

AES ‐ Somerset 2 NY

Far Rockaway Power Station 2 NY

Danskammer Generating Station 2 NY

Port Jefferson Power Station 2 NY

Indeck Corinth Energy Center 2 NY

WPS Syracuse Generation, LLC 2 NY

EME Homer City Generation L.P. 3 PA

Hatfield's Ferry Power Station 3 PA

RRI Energy Inc. Portland Generating Station 3 PA

Bruce Mansfield Plant 3 PA

Yorktown Power Station 3 VA

Virginia Electric and Power Company ‐ Gordonsville Power Station 3 VA

Mount Storm Power Station 3 WV

Albright Power Station 3 WV

Philip Sporn 3 WV

Harrison Power Station 3 WV

Rivesville Power Station 3 WV

Widows Creek 4 AL

Sanford Plant 4 FL

Turkey Point 4 FL

Martin 4 FL

JEA‐ St. Johns River Power Park 4 FL

Manatee 4 FL

A. B. HOPKINS GENERATING STATION 4 FL

Putnam 4 FL

C D McIntosh Jr. Power Plant 4 FL

Plant Jack McDonough 4 GA

Plant McManus 4 GA

Mid Georgia Cogen 4 GA

Big Sandy 4 KY

HMP&L Station Two 4 KY

Shawnee 4 KY

Magnolia Energy 4 MS

Buck Steam Station 4 NC

Marshall Steam Station 4 NC

Cope 4 SC
Jefferies Generating Station 4 SC

Cross Generating Station 4 SC

Canadys Station 4 SC

Johnsonville 4 TN

E.D. Edwards 5 IL

Duck Creek Power Plant 5 IL

Joliet Station 9 5 IL

Merom Generating Station 5 IN

General James M. Gavin 5 OH

Davis‐Besse Nuclear Power Station 5 OH

Wisconsin Power and Light ‐ Nelson Dewey Generating Station 5 WI

Independence Plant 6 AR

KGen Hot Spring LLC 6 AR

Entergy Operations, Inc.,  Waterford 3 S.E.S. 6 LA

Big Cajun 2 6 LA

Entergy Louisiana, LLC ‐ Ninemile Point Generating Plant 6 LA

Seminole Generating Station 6 OK

Wilkes 6 TX

Sam Bertron 6 TX

Frontera Energy Center 6 TX

Lewis Creek 6 TX

Louisa Generating Station 7 IA

Riverside Generating Station 7 IA

Interstate Power and Light ‐ Sutherland Generating Station 7 IA

George Neal South 7 IA

Fort Dodge Station 7 KS

Tecumseh Energy Center 7 KS

Lake Road Generating Station 7 MO

Hawthorn Generating Station 7 MO

Dave Johnston Plant 8 WY

Moss Landing 9 CA

Contra Costa Power Plant 9 CA

Mandalay Generating Station 9 CA

Malburg Generating Station 9 CA

Honolulu Generating Station 9 HI

Tenaska Ferndale Cogeneration Station 10 WA

River Road Generating Plant 10 WA
ion Reported to the Steam Electric Survey

MCW Type NPDES Permit

Chemical, Nonchemical, and

Unknown CT0003760

Chemical CT0026476

Chemical MA0004707

Chemical NH0020338

Chemical NJ0000663

Chemical and Nonchemical NY0104213

Nonchemical NY0005924

Nonchemical ny0006262

Nonchemical NY0005932

Chemical NY0230286

Chemical NY 0231681

Nonchemical PA0235555

Nonchemical PA0002941

Nonchemical PA‐0063606

Nonchemical PA0027481

Chemical and Nonchemical VA0004103

Chemical VA0087033

Chemical and Nonchemical WV0005525

Nonchemical WV0075281

Nonchemical WV0001058

Nonchemical WV0075795

Nonchemical WV0050776

Nonchemical AL0003875

Chemical and Nonchemical FL0001554

Chemical and Nonchemical FL0001562

Chemical and Nonchemical FL0030988

Chemical and Nonchemical FLR05G941

Chemical and Nonchemical FL0032174

Chemical and Nonchemical FL0025518

Chemical FL0032166

Chemical FL0026301

Nonchemical GA0001431

Chemical GA0003794

Chemical GAR000000

Nonchemical KY0000221

Nonchemical KY0001929

Nonchemical KY0004219

Chemical MS0056995

Chemical and Nonchemical NC0004774

Nonchemical NC0004987

Nonchemical SC0045772
Nonchemical SC0001091

Nonchemical SC0037401

Nonchemical SC0002020

Nonchemical TN0005444

Nonchemical IL0001970

Nonchemical IL0055620

Nonchemical IL0002216

Nonchemical IN0050296

Chemical and Nonchemical 0IB00006*JD

Nonchemical 2IB00011*ID

Nonchemical WI‐0002381‐05‐0

Chemical and Nonchemical AR0037451

Chemical AR0049417

Chemical and Nonchemical LA0007374

Chemical and Nonchemical LA0054135

Chemical LA0003093

Unknown OK0000451

Nonchemical TX0062006

Nonchemical TX0006378

Chemical WQ0004051000

Chemical TX0067890

Chemical and Nonchemical 58‐00‐1‐05

Nonchemical 8278101

Nonchemical IA0000108

Nonchemical 97‐00‐1‐06

Chemical KS0079995

Chemical and Nonchemical KS0079731

Nonchemical MO‐0004898

Chemical MO‐0004855

Chemical WY0003115

Chemical and Nonchemical CA0006254

Chemical CA0004863

Chemical CA0001180

Chemical CAS000001

Nonchemical HI0000027

Chemical WA‐003129‐1

Unknown WA0040932
1 ME ME0000272 Wyman Chemical and Nonchemical

1 NH NH0001465 Merrimack Chemical and Nonchemical

1 MA MA0003654 Brayton Point Chemical and Nonchemical

1 MA MA0004740 Mystic Station Chemical and Nonchemical

1 NH NH0001601 Newington Chemical and Nonchemical

1 CT CT0003263 Millstone Chemical

1 NH NH0020338 Seabrook Chemical

1 NH NH0001473 Schiller Chemical

2 PR PR0001660 PREPA Aguirre Chemical and Nonchemical

2 PR PR0001147 PREPA South Coast Chemical and Nonchemical

4 AL AL0003875 Widows Creek Chemical and Nonchemical

4 AL AL0002879 Barry Steam Chemical and Nonchemical

4 FL FL0030988 Martin Chemical and Nonchemical

4 FL FL0032174 Manatee Chemical and Nonchemical

4 GA GA0001431 Plant Jack McDonough Chemical and Nonchemical

4 GA GA0003794 Plant McManus Chemical and Nonchemical

4 KY KY0000221 Big Sandy Chemical and Nonchemical

4 KY KY0004219 Shawnee Nonchemical

4 MS MS0056995 Magnolia Energy Chemical

Region State NPDES Permit Plant Name Metal Cleaning Waste Type
4 MS MS0000167 Morrow Chemial

4 MS MS0002381 Rex Bown Chemical

4 MS MS000817 Delta Station Chemical

4 NC NC0004774 Buck Steam Station Chemical and Nonchemical

4 NC NC0004987 Marshall Steam Station Chemical and Nonchemical

4 SC SC0045772 Cope Chemical and Nonchemical

4 SC SC0002020 Canadys Station Chemical and Nonchemical

4 SC SC0001091 Jefferies Nonchemial

4 SC SC0001104 Grainger Nonchemical

4 TN TN0005444 Johnsonville Nonchemical

4 TN TN0005410 Bull Run Chemical and Nonchemical

5 IL IL0002216 Midwest Generation Joliet 9 Nonchemical

5 IL IL0000043 Dynegy Midwest Baldwin Nonchemical

5 IN IN0060950 

American Electric Power 

Lawrenceburg Chemical

5 IN IN0050296 Hoosier Energy Merom Chemical and Nonchemical

5 MI MI0001686 Detroit Edison St. Clair Chemical and Nonchemical

5 MI MI0001694 Detroit Edison Marysville Chemical and Nonchemical

5 MN MN0000876 Xcel Energy Black Dog

5 MN MN0000825 Xcel Energy Allen S King Disposed of offsite

5 OH OH0003786 First Energy David-Besse
5 OH OH0028762 

American Electric Power 

Gavin Chemical

5 WI WI0043583 

Wisconsin Energy Pleasant 

Prairie

5 WI WI0042765 

Wisconsin Public Service 

Corporation Weston 3 and 4

6 AR AR0037451 Entergy – Independence Chemical and Nonchemical

6 AR AR0049417 Entergy – Hot Springs Disposed of offsite

6 LA LA0054135 Big Cajun II

6 LA LA0003093 Entergy Ninemile Chemical and Nonchemical

6 LA LA0007374 Entergy Waterford 3 Chemical and Nonchemical

6 NM NM0000108 El Paso Electric Chemical and Nonchemical
6 OK OK0000451

Seminole Generating 

Station 

The metal cleaning waste 

generated at this facility is 

incinerated at either the OG&E 

Sooner plant or the OG&E 

Muskogee plant.

6 OK OK0044181 Calpine Oneta 
TX0074438

Texas Municipal Power 

Agency

TX0127256 Sandy Creek Energy

8 WY Dave Johnston Plant NA

9 CA Moss Landing Power Plant Chemical and Nonchemical
9 CA

Mandalay Generating 

Station Chemical and Nonchemical

9 HI Honolulu Generating Station Chemical and Nonchemical
No NA NA

No NA NA

No NA NA

No NA NA

LVW No mention of Jordan Memo

NA; only chemical NA NA

NA; only chemical NA NA

NA; only chemical NA NA

Yes LVW

The basis for using the 

low‐volume waste subcategory 

for oil and grease is the best 

professional judgement of the 

permit writer. The fact sheet 

does not reference the 1975 

Jordan Memo.

Yes LVW

The basis for using the 

low‐volume waste subcategory 

for oil and grease is the best 

professional judgement of the 

permit writer. The fact sheet 

does not reference the 1975 

Jordan Memo.

Yes CMCW No basis in fact sheet

No MCW

No MCW

No MCW

No MCW

No MCW

No MCW

Yes LVW No basis in fact sheet

NA; CMCW is trucked off site. 

There is no discharge to 

surface waters.

Is there a distinction between 

chemical cleaning waste and 

Nonchemical cleaning waste?

Is nonchemical cleaning 

waste permitted with limits 

for metal cleaning waste or 

low volume waste?

If nonchemical cleaning waste 

is handled as low volume 

waste, what is the basis?
NA; CMCW is trucked off site. 

There is no discharge to 

surface waters.

Yes MCW

Yes LVW

No MCW

No MCW

NA; CMCW is trucked off site. 

There is no discharge to 

surface waters.

NA; CMCW is trucked off site. 

There is no discharge to 

surface waters.

Yes LVW

Yes LVW

Yes LVW

Yes LVW

Disposed of offsite

LVW BPT
NA; only chemical

No MCW

No

Nonchemical not listed in the 

low volume wastewater 

description

No

Non chemical metal cleaning 

wastewaters is listed along with 

the chemical cleaning 

wastewater.

No

Non chemical metal cleaning 

wastewaters is listed along with 

the chemical cleaning 

wastewater.

No MCW
Uncertain

Uncertain
MCW

MCW

NA NA NA

No LVW No mention of Jordan Memo
No LVW No mention of Jordan Memo

No LVW No mention of Jordan Memo
The fact sheet references the definition of metal cleaning (chem and non-chem) at 40 CFR 423.11(d), 

however, the permit outfall description is “boiler chemical cleaning operations.” Permit limits are ELGbased for Fe and water-quality based for Cu.

Metal cleaning (chem and non-chem) monitoring is required with ELG-based limits for Fe and Cu. It is 

the same treatment plant and outfall used for other wastestreams including low volume, however, the 

permit specifies that “when treating chemical and nonchemical metal cleaning wastewaters, the 

permittee is prohibited from discharging any other wastestream (including low volume) to WTP#1.”

The initial chemical clean wastewater from the boiler is hauled for off-site disposal. Remaining metal 

cleaning (chem and non-chem) are permitted with ELG-based limit for Cu. Fe (also ELG-based limit) is 

monitored after the metal cleaning waste combines with other wastewaters, including low volume. Fact 

sheet explains that other wastewaters also contain Fe.

Metal cleaning (chem and non-chem) are permitted with ELG mass-based limits.

Permit includes Cu and Fe ELG-based limits for chemical metal cleaning waste (expected every 5 yrs). 

Like Merrimack, the outfall is the same physical location as for low volume waste. 

01A – treated wastewater during normal operations

01C- treated wastewater during metal cleaning operations

Steam generator chemical cleaning requires ELG-based Cu and Fe limits.

Chemical metal cleaning has ELG-based Cu and Fe limits.

ELG-based Cu and Fe limits apply to wastewater treatment plant “during boiler chemical cleaning 

operations only.” 

Effluent limitations for Oil and Grease (30 ave, 100 max) and TSS (15 ave, 20 max) limitations are 

based on Steam Electric Power Generating Point Source Category low volume waste sources effluent 

guideline (40 CFR 423.12(b)(5) Steam Electric Point Source Category ELG for metal and cleaning 

wastes, in accordance with BPT). The limitations for Copper (1 ave, 1 max) and Zinc (1 ave, 1 max) are 

based on Steam Electric Power Generating Point Source Category metal cleaning waste sources 

effluent guideline in accordance with BAT (40 CFR 423.12(e)(5)).

Effluent limitations for Oil and Grease (30 ave, 100 max) and TSS (15 ave, 20 max) limitations are 

based on Steam Electric Power Generating Point Source Category low volume waste sources effluent 

guideline (40 CFR 423.12(b)(5) Steam Electric Point Source Category ELG for metal and cleaning 

wastes, in accordance with BPT). The limitations for Copper (1 ave, 1 max) and Zinc (1 ave, 1 max) are 

based on Steam Electric Power Generating Point Source Category metal cleaning waste sources 

effluent guideline in accordance with BAT (40 CFR 423.12(e)(5)).

TSS and O&G limits are based on EG for LVW

EG limits for TSS, O&G, Cu and Fe

EG limits for TSS, O&G, Cu and Fe

EG limits for TSS, O&G, Cu and Fe

EG limits for TSS, O&G, Cu and Fe

EG limits for TSS, O&G, Cu and Fe

EG limits for TSS, O&G, Cu and Fe

EG limits for TSS and O&G for LVW

Limits and Other Comments
EG for TSS, O&G, Cu and Fe

EG for TSS and O&G

EG for TSS, O&G, Cu and Fe

EG for TSS, O&G, Cu and Fe

EG for TSS and O&G

EG for TSS and O&G

EG for TSS and O&G

EG for TSS and O&G

Has non-chemical cleaning waste stream. Cites BPT ELG requirements and includes copper and iron 

limits.

Application lists non-chemical cleaning wastes as intermittent discharge from outfall 001, but does not 

describe specific cleaning wastes. Permit and Factsheet do not identify specific wastes, but 

acknowledge non-chemical cleaning wastes from Outfall 001. However, no limits for iron and copper 

are included.

All chemical metal cleaning waste is disposed of offsite.

Metal cleaning waste is identified as being discharged from Outfall 001. Outfall 101 is specifically for low 

volume waste and metal cleaning waste and has copper and iron limits. A combined waste stream 

allocation was not prepared even though there is the potential to dilute the metal cleaning waste with the 

low volume waste. The fact sheet points to the BPT requirements.

Outfall 001 identifies chemical and non-chemical metal cleaning wastes as being discharged through 

this outfall, but does not contain copper and iron limits. Outfall 001B does have the limits consistent with 

BPT for metal cleaning wastes, however it specifically states that those limits only need to be met when 

chemical metal cleaning wastes are being discharged and prior to combination with other wastestreams.

Plant is not currently operating, but Outfall 001 identifies chemical and non-chemical metal cleaning 

wastes as being discharged through this outfall, but does not contain copper and iron limits. Outfall 

001B does have the limits consistent with BPT for metal cleaning wastes, however it specifically states 

that those limits only need to be met when chemical metal cleaning wastes are being discharged and 

prior to combination with other wastestreams.

Permit does not specifically limit metal cleaning wastes, but has iron and copper limits at the ash pond 

discharge. Footnote states that “discharge of any discrete metal cleaning wastewater types to the ash 

pond system shall not occur just prior to or during a discharge from the ash pond system via SD005. 

Chemical metal cleaning wastes shall not be discharged to the ash pond system except as a secondary 

protection in the event of a failure or a leak. The ash pond discharges to Black Dog Lake which is a 

cooling pond (not WOTUS) adjacent to the Minnesota River but there is a consistent discharge from the 

cooling pond to the Minnesota River.

The permit prohibits the discharge of metal cleaning wastes to the hold-up pond and requires them to be 

collected and transported offsite.

The permit and fact sheet do not discuss or limit metal cleaning wastes. The permit identifies an internal 

outfall for low volume waste, but does not provide a detailed description of the waste streams comprising 

that discharge. The flow diagram indicates that there is the potential for metal cleaning wastes from the 

facility.
The permit has specific procedures for chemical metal cleaning waste including limits for copper and 

iron. Non-chemical metal cleaning wastes were not mentioned. 

The permit has an internal outfall for metal cleaning wastes comprised of air preheater wash water, 

boiler cleaning waste water and other low volume wastes. Limits for copper and iron are included, but 

only apply when metal cleaning wastewater is being discharged.

The permit has limits at outfall 102 which discharges from the metal wastewater treatment pond that 

includes wastewaters from boiler water acid/caustic demineralizer regeneration, reverse osmosis 

membrane cleaning, and non-chemical metal surface cleaning that are equalized and treated for metals 

precipitation, suspended solids removal and pH control. It has the copper and iron limitations.

Separate, lined pond is used to store metal treatment wastewater. A common pump station is used to 

draw water for batch treatment to remove metals and suspended solids. The wastewater treatment 

system is designed to remove iron, copper and suspended solids. The wastewater treatment system 

consists of hydroxide precipitation of metals at pH 10.8 followed by solids separation in two solids 

contact clarifiers. The clarified effluent is polished by sand filtration to capture any remaining metallic 

hydroxide precipitates, and then pH (acid) adjusted prior to discharge to the outfall 002 piping system. 

Effluent that does not meet the iron, copper, total suspended solids, oil and grease, and pH national 

discharge standards for this industrial category can be recycled (with the sand filter backwash) back to 

the metal treatment pond.

Non chemical metal cleaning waste is handled as metal cleaning waste. Internal Outfall 01F has limits 

for Cu and Fe 1.0 / 1.0 mg/l (Mthly Avg / Daily Max). Wastestream later commingled with another 

Internal Outfall 01H– low volume wastestream – TSS 30 / 50 mg/l, O&G 15 / 20 mg/l (Mthly Avg / Daily 

Max).

Discharge of metal cleaning wastestreams is prohibited. Wastestreams are collected, characterized and 

disposed of off site.

Metal cleaning wastewater is commingled with other low volume wastewater. Nonchemical metal 

cleaning wastewaters are not listed in the low volume wastewater description.

Chemical and nonchemical metal cleaning wastewaters are commingled into one outfall.

Chemical and nonchemical metal cleaning wastewaters are commingled into one outfall.

Metal cleaning wastestreams treated as internal outfalls 106, 107 and 108. The limits are TSS 30 / 100 

mg/l, O&G 15 / 20 mg/ l, Ttl Cu 1.0 / 1.0 mg/l, Ttl Fe 1.0 / 1.0 mg/l (Mthly Avg / Daily Max)
The ODEQ defines in fact sheet as follows:

b. The term “chemical metal cleaning waste” means any wastewater resulting from the cleaning of any 

metal process equipment with chemical compounds, including, but not limited to, boiler tube cleaning.

d. The term “low volume waste sources” means, taken collectively as if from one source, wastewater 

from all sources except those for which specific limitations are otherwise established in this part. Low 

volume waste sources include, but are not limited to: wastewaters from wet scrubber air pollution control 

systems, ion exchange water treatment systems, water treatment evaporator blowdown, laboratory and 

sampling streams, boiler blowdown, floor drains, cooling tower basin cleaning wastes, and recirculating 

house service water systems. Sanitary and air conditioning wastes are not included.

e. The term “metal cleaning waste” means any wastewater resulting from the cleaning (with or without 

chemical cleaning compounds) any metal process equipment including, but not limited to, boiler tube 

cleaning, boiler fireside cleaning, and air preheater cleaning.

BPT LVW Limitations – Outfall 002

Oil and Grease: Monthly Average 15 mg/l, Daily Maximum 20mg/l

Total Suspended Solids: Monthly Average 30 mg/l, Daily Maximum 100 mg/l

pH: Between 6.5 s.u. – 9.0 s.u.

BPT Effluent Limitations for Low Volume Wastes

Total Suspended Solids (TSS): 30 ave/100 max

Oil and Grease: 15 ave/20 max

Chemical metal cleaning waste generated at the facility includes wastewater generated from washing 

combustion turbine blades to remove particles that may influence the performance efficiency of the 

turbines. Turbine blade washing is done at least twice a year. This wastewater is monitored at the IMPs 

02A and 03A before it is trucked off site or passed to the clean water sump.

b. The term “chemical metal cleaning waste” means any wastewater resulting from the cleaning of 

any metal process equipment with chemical compounds, including, but not limited to, boiler tube 

cleaning.

d. The term “low volume waste sources” means, taken collectively as if from one source, 

wastewater from all sources except those for which specific limitations are otherwise established in this 

part. Low volume waste sources include, but are not limited to: wastewaters from wet scrubber air 

pollution control systems, ion exchange water treatment systems, water treatment evaporator blowdown, 

laboratory and sampling streams, boiler blowdown, floor drains, cooling tower basin cleaning wastes, 

and recirculating house service water systems. Sanitary and air conditioning wastes are not included.

NSPS Effluent Limitations for Low Volume waste –

Total Suspended Solids – Monthly Avg 30.0 mg/l, Daily Max 100.0 mg/l

Oil and Grease Monthly Avg 15.0 mg/l, Daily Max 20.0 mg/l

NSPS Effluent Limitations Applying to Chemical Metal cleaning waste –

Total Suspended Solids Monthly Avg 30.0 mg/l , 100.0 mg/l

Oil and Grease Monthly Avg 15.0 mg/l , Daily Max 20.0 mg/l

Copper, total Monthly Avg 1.0 mg/l, Daily Max 1.0 mg/l

Iron, total Monthly Avg 1.0 mg/l, Daily Max 1.0 mg/l
Metal cleaning waste is treated via settling and neutralization prior to discharge. The limits are based on 

ELGs for this type of waste stream:

TSS: 30mg/l DA, 100 mg/l DM

Oil & Grease: 15 mg/l DA, 20 mg/l DM

Iron (T): 1.0 mg/l DA and DM

Copper (T): 1.0 mg/l DA and DM.

Based on information in the permit package and spreadsheet, the metal cleaning waste stream at the 

plant can also be considered nonchemical metal cleaning waste; the wastestream is a result of periodic 

high pressure washing of air preheater baskets and boiler tube cleaning.

Metal cleaning waste is generated from boilershed wash. The waste stream is routed and transported 

off site for disposal or treated and discharged via outfall 101. Limits are based on current steam electric 

ELGs for this type of waste stream.

TSS: 30mg/l DA, 100 mg/l DM

Oil & Grease: 15 mg/l DA, 20 mg/l DM

Iron (T): 1.0 mg/l DA and DM

Copper (T): 1.0 mg/l DA and DM.

Metal cleaning waste is treated via settling and neutralization prior to discharge. The limits are based on 

ELGs for this type of waste stream:

TSS: 30mg/l DA, 100 mg/l DM

Oil & Grease: 15 mg/l DA, 20 mg/l DM

Iron (T): 1.0 mg/l DA and DM

Copper (T): 1.0 mg/l DA and DM.

Based on information in the permit package and spreadsheet, the metal cleaning waste stream at the 

plant can also be considered nonchemical metal cleaning waste; the wastestream is a result of periodic 

high pressure washing of air preheater baskets and boiler tube cleaning.

Metal cleaning waste is generated from boilershed wash. The waste stream is routed and transported 

off site for disposal or treated and discharged via outfall 101. Limits are based on current steam electric 

ELGs for this type of waste stream.

TSS: 30mg/l DA, 100 mg/l DM

Oil & Grease: 15 mg/l DA, 20 mg/l DM

Iron (T): 1.0 mg/l DA and DM

Copper (T): 1.0 mg/l DA and DM.

Low Volume Waste limits: 

TSS 30/100 mg/l (ave/max)

Oil and Grease 15/20 mg/l (ave/max)

Chemical Metal Cleaning Waste limits:

TSS 30/100 mg/l (ave/max)

Oil and Grease 15/20 mg/l (ave/max)

Copper 1/1 mg/l (ave/max)

Iron 1/1 mg/l (ave/max)
Low Volume Waste limits:

TSS 30/100 mg/l (ave/max)

Oil and Grease 15/20 mg/l (ave/max)

Chemical Metal Cleaning Waste limits (Metal Cleaning Waste is defined as "any wastewater resulting 

from chemical cleaning of any metal process equipment including, but not limited to, boiler tube, boiler 

fireside, and air preheaters."):

TSS 30/100 mg/l (ave/max)

Oil and Grease 15/20 mg/l (ave/max)

Copper 1/1 mg/l (ave/max)

Iron 1/1 mg/l (ave/max)

Low Volume Waste limits:

TSS 30/100 mg/l (ave/max)

Oil and Grease 15/20 mg/l (ave/max)

Metal Cleaning Waste limits:

TSS 30/100 mg/l (ave/max)

Oil and Grease 15/20 mg/l (ave/max)

Copper 1/1 mg/l (ave/max)

Iron 1/1 mg/l (ave/max)

56

Total Number from Review Excluding Plants with Chemical Cleaning Wastes Only

Total Number of Permits Reviewed with with the Potential for Nonchemical Metal Cleaning 

Wastes

Number of Permits that are Zero Discharge or have Copper & Iron Limits

Number of Permits that Do Not Have Copper & Iron Limits

Number of Permits that Do Not Have Enough Information to be Evaluated
Can't Evaluate 

Cleaning Type Reason

Chemical 

Cleaning 

Wastes only

Zero 

Discharge

Chemical plus 

Nonchemical 

Metal Cleaning 

Wastes?

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1 1
1 1

1

1

1

1

1 1

1 1

1

1 1

1

1

1

1

No discussion of 

cleaning types

1

1

No description 

provided.
1

1

1

1

1

1

Conflicting reports of 

where the 

nonchemical 

wastewater goes

1

1

1
11
1

1

1

No information 

provided

1
1

1

4 11 9 31

4 0 4 31

45

29 64%

12 27%

4 9%
Nonchemical 

Metal Cleaning 

Wastes?

Low-Volume 

Waste Limits?

Metal Cleaning 

Waste Limits?

Chemical Metal 

Cleaning Waste 

Limits?

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1

1 1

Evaluation of the Permit Review Results
1

1

1

1

1 1

1 1

1 1

1

1 1

1 1

1

1

1

1
1

1111
1
11

1
1

1

6 13 24 6

6 12 23 2
Notes

Combined with other streams prior to outfall. Initial chemical 

metal cleaning waste is hauled offsite, all other residuals 

and cleaning wastes combined and discharged

Combined outfall.
Limit is to ash pond. No discharges of metal cleaning waste 

to ash pond while ash pond is discharging to adjacent 

cooling pond. Cooling pond discharges to Minnesota River