GP COMP CTCSW0034.pdf

79 Elm Street • Hartford, CT 06106-5127 www.ct.gov/deep Affirmative Action/Equal Opportunity Employer

Permit: CTCSW0034

Michael J. Brown

U.S. Naval Submarine Base New London

NAVFAC MIDLANT PWD NLON

Environmental Division

PO Box 400

439 Tautog Avenue, Room 104

Groton, CT 06340

Re: Authorizing a Discharge under the Comprehensive General Permit for Discharges to Surface Water and

Groundwater for the U.S. Naval Submarine Base New London at the corner of Route 12 and Crystal Lake

Road.

Dear Mr. Brown:

The issuance letter for the above referenced permit dated March 5 2020, has been modified. The modification adds temperature to the monitoring parameters in Tables A, C, and E. It was inadvertently omitted. It, like the other parameters, has a monitoring frequency of “Annually.” NetDMR will be updated to reflect this change. For any

NetDMR, Subscriber Agreement, or DMR reporting questions, please contact Lilly Molina at (860) 424-3922 or at lilly.molina@ct.gov.

Abbreviations used in the table are as follows:

“gpd” means gallons per day.

“mg/l” means milligrams per liter.

“NA” means "not applicable".

“NR” means "not required".

“S.U.” means Standard Units.

“----“ means limit is not specified but a value must be reported.

“Annually” means the sample must be collected in the month of June.

mailto:lilly.molina@ct.gov

Table A—(NetDMR Reporting Required)

Discharge Serial Number: DSN 035F-1 Monitoring Location: 1

Wastewater Description: Noncontact Cooling Water

Monitoring Location Description: Cooling tower sump drain

Discharge is to: Surface Water

FLOW/TIME BASED MONITORING INSTANTANEOUS MONITORING

PARAMETER UNITS

Average

Daily

Limit

Maximum

Daily

Limit

Sample/Reporting

Frequency2

Sample Type or

Measurement to be

Reported

Instantaneous

Limit or

Required

Range

Sample/

Reporting

Frequency2

Sample Type or

Measurement to be

Reported

Flow, day of sampling1 gpd NA 900 Annually Daily Flow NA NR NA pH, day of sampling S.U. NA NA NR NA 6.0-9.0 Annually Grab

Temperature F NA NA NR NA 100 Annually Grab

Copper, total mg/l NA NA NR NA 0.12 Annually Grab

Lead, total mg/l NA NA NR NA 0.15 Annually Grab

Zinc, total mg/l NA NA NR NA 0.32 Annually Grab

Total Residual

Chlorine mg/l NA NA NR NA 0.05 Annually Grab

Appearance NA NA NR NA NA Annually Visual

Table Footnotes:

1 For this parameter, the Permittee shall maintain at the facility a record of the Total Daily Flow for each day of discharge.

2 Reporting shall be in accordance with Section 5(f) of the Comprehensive GP.

NetDMR Reporting of monitoring results is required for this discharge.

Table B—Aquatic Toxicity (NetDMR Reporting Required)

Discharge Serial Number: DSN 035F-1 Monitoring Location: T

Wastewater Description: Noncontact Cooling Water

AQUATIC TOXICITY MONITORING

Instantaneous Limit or Required Range

Sample/ Reporting

Frequency2

Sample Type or

Measurement to be

Reported

Minimum Detection

Level

Aquatic Toxicity, NOAEL

Daphnia pulex or if

Salinity Msidopsis bahia

% NOAEL ≥ 90%

Annually

Grab ---

Pimephale promelas or if salinity Menidia beryllina

% NOAEL ≥ 90%

Annually

Grab ---pH, day of sampling S.U. 6.0-9.0

Grab +/- 0.10 SU

Temperature F --- Annually Grab °F

Copper, total mg/l --- Annually Grab .005 mg/l

Lead, total mg/l --- Annually Grab .005 mg/l

Zinc, total mg/l --- Annually Grab .005 mg/l

Iron, total mg/l --- Annually Grab 0.1 mg/l

Total Residual Chlorine mg/l --- Annually

Grab 0.1 mg/l

Salinity ppt --- Annually Grab ppt

Hardness mg/l --- Annually Grab ---

Alkalinity mg/l

CaCo3

Annually Grab ---

Specific Conductance µS --- Annually

Grab ---

Appearance --- Annually Visual ---

Remarks

All samples collected for determination of aquatic toxicity shall be analyzed for chemical parameters using the methods specified in 40

CFR 136 which are capable of achieving the limits of detection specified in the Comprehensive GP.

Table Footnotes:

1 For this parameter, the Permittee shall maintain at the facility a record of the Total Daily Flow for each day of discharge.

Table C—(NetDMR Reporting Required)

Discharge Serial Number: DSN 035F-2 Monitoring Location: 1

Wastewater Description: Noncontact Cooling Water

Limit

Maximum

Daily

Limit

Sample/Reporting

Frequency2

Sample Type or

Measurement to be

Reported

Instantaneous

Limit or

Required

Range

Sample/

Reporting

Frequency2

Sample Type or

Measurement to be

Reported

Flow, day of sampling1 gpd NA 900 Annually Daily Flow NA NR NA pH, day of sampling S.U. NA NA NR NA 6.0-9.0 Annually Grab

Temperature F NA NA NR NA 100 Annually Grab

Copper, total mg/l NA NA NR NA 0.12 Annually Grab

Lead, total mg/l NA NA NR NA 0.15 Annually Grab

Zinc, total mg/l NA NA NR NA 0.32 Annually Grab

Total Residual

Chlorine mg/l NA NA NR NA 0.05 Annually Grab

Appearance NA NA NR NA NA Annually Visual

Table Footnotes:

1 For this parameter, the Permittee shall maintain at the facility a record of the Total Daily Flow for each day of discharge.

Table D—Aquatic Toxicity (NetDMR Reporting Required)

Discharge Serial Number: DSN 035F-2 Monitoring Location:

T

Wastewater Description: Noncontact Cooling Water

Instantaneous

Limit or Required

Range

Sample/

Reporting

Frequency2

Sample Type or

Measurement to be Reported

Minimum Detection

Level

Salinity Msidopsis bahia

% NOAEL ≥ 90%

Annually

Grab ---

Pimephale promelas or if salinity Menidia beryllina

% NOAEL ≥ 90%

Grab +/- 0.10 SU

Temperature F --- Annually Grab °F

Copper, total mg/l --- Annually Grab .005 mg/l

Lead, total mg/l --- Annually Grab .005 mg/l

Zinc, total mg/l --- Annually Grab .005 mg/l

Iron, total mg/l --- Annually Grab 0.1 mg/l

Total Residual

Chlorine mg/l ---

Annually Grab 0.1 mg/l

Salinity ppt --- Annually Grab ppt

Hardness mg/l --- Annually Grab ---

Alkalinity mg/l

CaCO3

Annually Grab ---

Specific Conductance µS --- Annually

Grab ---

Appearance --- Annually Visual ---

Remarks

All samples collected for determination of aquatic toxicity shall be analyzed for chemical parameters using the methods specified in 40 CFR 136 which are capable of achieving the limits of detection specified in the Comprehensive GP.

Table Footnotes:

1 For this parameter, the Permittee shall maintain at the facility a record of the Total Daily Flow for each day of discharge.

Table E—(NetDMR Reporting Required)

Discharge Serial Number: DSN 037F-1 Monitoring Location: 1

Wastewater Description: Noncontact Cooling Water

Limit

Maximum

Daily

Limit

Sample/Reporting

Frequency2

Sample Type or

Measurement to be

Reported

Instantaneous

Limit or

Required

Range

Sample/

Reporting

Frequency2

Sample Type or

Measurement to be

Reported

Flow, day of sampling1 gpd NA 3000 Annually Daily Flow NA NR NA pH, day of sampling S.U. NA NA NR NA 6.0-9.0 Annually Grab

Temperature F NA NA NR NA 100 Annually Grab

Copper, total mg/l NA NA NR NA 0.12 Annually Grab

Lead, total mg/l NA NA NR NA 0.15 Annually Grab

Zinc, total mg/l NA NA NR NA 0.32 Annually Grab

Total Residual

Chlorine mg/l NA NA NR NA 0.05 Annually Grab

Appearance NA NA NR NA NA Annually Visual

Table Footnotes:

1 For this parameter, the Permittee shall maintain at the facility a record of the Total Daily Flow for each day of discharge.

Table F—Aquatic Toxicity (NetDMR Reporting Required)

Discharge Serial Number: DSN 037F-1 Monitoring Location:

T

Wastewater Description: Noncontact Cooling Water

Instantaneous

Limit or Required

Range

Sample/

Reporting

Frequency2

Sample Type or

Measurement to be Reported

Minimum Detection

Level

Salinity Msidopsis bahia

% NOAEL ≥ 90%

Annually

Grab ---

Pimephale promelas or if salinity Menidia beryllina

% NOAEL ≥ 90%

Grab +/- 0.10 SU

Temperature F --- Annually Grab °F

Copper, total mg/l --- Annually Grab .005 mg/l

Lead, total mg/l --- Annually Grab .005 mg/l

Zinc, total mg/l --- Annually Grab .005 mg/l

Iron, total mg/l --- Annually Grab 0.1 mg/l

Total Residual

Chlorine mg/l ---

Annually Grab 0.1 mg/l

Salinity ppt --- Annually Grab ppt

Hardness mg/l --- Annually Grab ---

Alkalinity mg/l

CaCo3

Annually Grab ---

Specific Conductance µS --- Annually

Grab ---

Appearance --- Annually Visual ---

Remarks

All samples collected for determination of aquatic toxicity shall be analyzed for chemical parameters using the methods specified in 40 CFR 136 which are capable of achieving the limits of detection specified in the Comprehensive GP.

Table Footnotes:

1 For this parameter, the Permittee shall maintain at the facility a record of the Total Daily Flow for each day of discharge.

If you have any questions about NetDMR, your Subscriber Agreement, or DMR Reporting please contact Lilly

Molina at (860) 424-3922 or at lilly.molina@ct.gov .

If you have questions, please contact Helen Robbins at 860-424-3291 or at helen.robbins@ct.gov.

May 26, 2020

Date Helen Robbins

Sanitary Engineer 3

Water Permitting and Enforcement Division

HR/th mailto:lilly.molina@ct.gov mailto:helen.robbins@ct.gov