nyc dep - bwso - us environmental protection agency · from: garin, james to: tsiamis, christos cc:...

From: Garin, JamesTo: Tsiamis, ChristosCc: Greene, Daniel (Law); Licata, Angela; Mahoney, Eileen; Stein, Julie; Estesen, Terrell; Wimbish, Mitchell;

[email protected]; [email protected]; Carrie, Herve ([email protected]); Reddy, Krishna (DDC);Barbaro, Nicholas; Gordon, Peter

Subject: FW: HLSS Response to EPADate: Friday, February 01, 2013 4:13:48 PMAttachments: 2013-1-28 Gowanus HLSS EPA Response 1.30.doc

FW Carroll Street Bridge over Gowanus canal.msgSEK20065 Gowanus Canal Dwgs.msg

Hi Christos -In response to your questions to NYC DDC (email attached) regarding their submission for theGowanus area high level storm sewer project, attached please find a joint DEP/DDC response aswell as the relevant drawings.Thank you and have a nice weekend.Jim Garin, P.E.Director of EngineeringNYC DEP - BWSO From: Saini, Gurdip (DDC) [mailto:[email protected]] Sent: Friday, February 01, 2013 3:46 PMTo: Garin, James; Barbaro, NicholasCc: Reddy, Krishna (DDC); Franz, George (DDC); Ng, Yun Poy (DDC); Dharia, Purnima (DDC)Subject: FW: HLSS Response to EPA Hi Jim: All relevant attachments are ready for your use so that you send the combined response toEPA From: Saini, Gurdip (DDC) Sent: Thursday, January 31, 2013 1:20 PMTo: 'Barbaro, Nicholas' ([email protected])Cc: Rousakis, John; Garin, James; Wimbish, Mitchell; Greene, Dan; Estesen, Terrell; Stein, Julie;Venugopalan, Narayana (DDC); Ng, Yun Poy (DDC); Reddy, Krishna (DDC); Franz, George (DDC); Hunt,Gregory (DDC); Macfarlane, Eric (DDC)Subject: FW: HLSS Response to EPA As the response was prepared with combined DDC/DEP input, we at DDC Infrastructure/Designoffer no further comments. However, if DEP Legal and/or DDC Legal teams have any comments,they may add to the response. As DEP intends to correspond directly with EPA it is convenient thatthe signing of the response should also come from DEP officials. Otherwise, Deputy CommissionerEric MacFarlane may be requested to sign on behalf of DDC.
mailto:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]:[email protected]
Mr. Tsiamis

We received your comments on the design drawings in an email dated November 14, 2012. Please note that the design drawings have been updated: The apron and flap gate have been removed and the existing 42 Combined Sewer outfall will be replaced with a new 48 combined sewer outfall and a 48 high level storm sewer outfall. The outfall sizes are kept at 48 diameter for consistency, in accordance with discussions with New York City Landmarks Preservation Commission. The updated drawings are attached. Our responses to your comments are as follows:

1. Only drawings 2 of 12 and 11 of 12 were provided for our review.

Sheets 2 and 11 were the only drawings included in the submittal, as these two drawings detail the sewer outfall, a full set of drawings is attached.

2. No engineer's report, basis of design report, facility plan, or other documentation was provided with information on the project, specifically, its purpose, scope, schedule, etc. Therefore, the full extent of the project is unknown.

This is a City funded in-house designed sewer project initiated to build high level storm sewers to alleviate flooding and reduce sewer back-ups, and will also result in a reduction of combined sewer overflows. Customarily, no design reports are prepared for such projects. Please see project description below. .

3. Your September 11 e-mail indicates that construction is planned to start late summer/fall of 2013. Therefore, the project will be in construction before any Superfund dredging activities begin.

This project has been delayed due to various issues, for example, the private utility companies have expressed concern over major interference between the proposed new sewers and the existing private utility infrastructure. Despite these concerns, DEP expects construction tostart in the summer of 2014 and last until the winter 2015, before dredging activities are scheduled to start.

4. The design appears to be for a sewer separation project with a Combined Sewer Overflow (CSO) outfall modification to OH-005 at Carroll Street featuring the following:

a. Replacing the 42-inch combined sewer outfall at OH-005 next to the Carroll Street Bridge with a 48x42 double-barreled outfall.

b. One of the new barrels appears to convey stormwater directly to the canal from Carroll Street and up the street towards 3rd Avenue

c. The other new barrel will be discharging flow that comes from 3rd Avenue.

The design is a partial sewer separation in that it would remove street stormwater runoff only from the existing combined sewer primarily along 3rd Avenue, but also along side streets. The existing combined sewer would remain in place to convey wastewater and stormwater from lots beyond the right-of-way to wastewater treatment plants for treatment and discharge. The existing 42 combined sewer outfall will be replaced with one new 48 combined sewer outfall and a 48 high level storm sewer outfall. Please see response for 5a and b for additional information about the project.

d. A flap gate will be added to the existing headwall on the outfall.

The flap gate has been removed from the revised drawings.

e. The area in front of the outfall will be dredged to build a 10'-0"x14'-0" pavement apron, planned as flush with the natural bottom.

The apron has been removed from the revised drawings, as no soil erosion is expected due to the construction of these outfalls. Furthermore, most of the city outfalls at the sea wall locations do not have aprons. Any work within the bed of the canal for the construction of the outfalls would be coordinated with EPA to ensure proper handling of sediment and limiting potential exposure to contaminated materials.

f. The pavement apron will be a 2-foot deep layer of 500-700 lb stones on top of a 1-foot layer of rip rap.

The apron and stone bedding has been removed from the revised drawings.

g. Please confirm that our above interpretation of the work, based on the limited information that you provided, is correct.

It is correct modified as described above (i.e. the flap gate, apron and stone bedding have been removed) and as shown on the attached revised drawings.

h. A 42-inch combined sewer outfall is being replaced with a double barrel 48x42 outfall, with one barrel dedicated to CSO. Based on the increased size of the outfall dedicated to CSOs, it appears that NYCDDC (and presumably NYCDEP) does not anticipate peak CSO discharges to decrease with the project (unless the separation is in a different area than the existing combined sewer drainage to OH-005.) Please confirm if that observation is correct.

DEP modeled the CSO volume reduction associated with the HLSS and projected an approximately 5% reduction within the Gowanus Canal (on top of the 34% CSO volume reduction projected with the pumping station upgrade). The 5% reduction resulted from a 9 MG/yr reduction at RH-034 and 3 MG/yr reduction at OH-007. This will be updated as part of the modeling for the environmental review of the proposed project and reflected in the Gowanus LTCP. Note that the size of the combined sewer outfall is being increased in order to provide visual consistency with the 48-inch high-level storm sewer outfall as requested by New York City Landmarks Preservation Commission it is not being increased because of volume.

5. This design appears to be for the high level sewer separation project that NYCDEP has mentioned in its presentations to USEPA as an additional alternative to further reduce CSO discharges to the Gowanus Canal above and beyond its Long Term Control Plan (LTCP). Since this project has apparently progressed to the point of design, as reflected in the received drawings, then NYCDEP should be in a position to provide us with information on how the project will affect discharges to the canal. Specifically, in order to obtain an overall understanding of the project and better assess its impact to the Superfund project, we have the following questions:

a. What is the exact nature of this project?

The proposed project was initiated to address street flooding in the area from 4th Avenue to the Gowanus Canal, from Douglas Street to Carroll Street in Brooklyn. In this area, new high level storm sewers would be installed to drain a 96-acre area bounded by First Place, Fourth and Third Avenues and State Street. A new high-level storm sewer outfall into the Gowanus Canal would also be constructed at Carroll Street.

A high level storm sewer (HLSS) is a storm sewer installed in a combined area that collects street flow thereby removing the volume from the existing combined sewer system, and ultimately CSO discharge. The existing 42 combined sewer outfall (OH-005) will be replaced with one new 48 combined sewer outfall and a 48 high level storm sewer outfall. The proposed project, upon completion, is also anticipated to reduce CSO discharges at outfalls RH-034 and OH-007 beyond the CSO volumes projected in DEPs Waterbody/Watershed Facility Plan (2009). See response to 4h for additional details on modeled CSO volume reductions.

b. How will it affect discharges including pollutant loads to the canal?

See response to 4h for additional details on modeled CSO volume reductions.

The effect of the above CSO volume reductions on water quality including pollutant load reductions will be modeled as part of the environmental review for this project, expected to be released in the summer of 2013. This modeling will be also used in the development of the Gowanus Canal LTCP to be submitted to the New York State Department of Environmental Conservation (DEC) in June 2015.

6. What is the construction schedule?

Based on current information, construction is expectedto start in the summer of 2014 and last until the winter of 2015. It is anticipated to be in operation beginning in 2016.

7. Please provide documentation such as a facility plan, engineer's report, basis of design report, etc. that better describe the project.

This is a City funded in-house designed sewer project. Customarily, no design reports are prepared for such projects (see above regarding design initiation and project description).

8. Dredging to install the apron in front of the outfall will disturb the soft sediments with a likely footprint larger than the 10'-0"x14'-0" area. Since the project will be in construction starting in 2013, which will be before Superfund dredging activities begin, the apron will need to be removed as part of the Superfund dredging and re-installed by NYCDEP or NYCDDC following Superfund construction activities.

a. The depth of the apron appears to be set at the level of the natural bottom. What is that depth in relation to the dredging depth described in EPAs December 2011 Feasibility Study (FS) for the canal?

See response above for 4e.

b. Other outfalls on the canal do not have aprons, why is the apron necessary here?

See response above for 4e.

9. Are there NYCDEP or NYCDDC plans to install aprons at other Gowanus Canal outfalls?

No, not at the current time.

FW: Carroll Street Bridge over Gowanus canal

From

Reddy, Krishna (DDC)

To

Saini, Gurdip (DDC)

Recipients

[email protected]

From: [email protected] [mailto:[email protected]] Sent: Wednesday, November 14, 2012 2:08 PMTo: Reddy, Krishna (DDC)Cc: Dharia, Purnima (DDC); Franz, George (DDC); Lago, Manuel (DDC); Saini, Gurdip (DDC); Licata, Angela; [email protected]: RE: Carroll Street Bridge over Gowanus canal

Dear Krishna,

We have reviewed the the two design drawings (2 of 12 and 11 of 12) that you had sent me, in your email of September 11, 2012, for a sewer outfall at the Carroll Street Bridge and we offer the following comments:

Only drawings 2 of 12 and 11 of 12 were provided for our review.

No engineer's report, basis of design report, facility plan, or other documentation was provided with information on the project, specifically, its purpose, scope, schedule, etc. Therefore, the full extent of the project is unknown.

Your September 11 e-mail indicates that construction is planned to start late summer/fall of 2013. Therefore, the project will be in construction before any Superfund dredging activities begin.

The design appears to be for a sewer separation project with a Combined Sewer Overflow (CSO) outfall modification to OH-005 at Carroll Street featuring the following:

o Replacing the 42-inch combined sewer outfall at OH-005 next to the Carroll Street Bridge with a 48x42 double-barreled outfall. o One of the new barrels appears to convey stormwater directly to the canal from Carroll Street and up the street towards 3rd Avenue. o The other new barrel will be discharging flow that comes from 3rd Avenue. o A flap gate will be added to the existing headwall on the outfall. o The area in front of the outfall will be dredged to build a 10'-0"x14'-0" pavement apron, planned as flush with the natural bottom. o The pavement apron will be a 2-foot deep layer of 500-700 lb stones on top of a 1-foot layer of rip rap.

Please confirm that our above interpretation of the work, based on the limited information that you provided, is correct.

A 42-inch combined sewer outfall is being replaced with a double barrel 48x42 outfall, with one barrel dedicated to CSO. Based on the increased size of the outfall dedicated to CSOs, it appears that NYCDDC (and presumably NYCDEP) does not anticipate peak CSO discharges to decrease with the project (unless the separation is in a different area than the existing combined sewer drainage to OH-005.) Please confirm if that observation is correct.

This design appears to be for the high level sewer separation project that NYCDEP has mentioned in its presentations to USEPA as an additional alternative to further reduce CSO discharges to the Gowanus Canal above and beyond its Long Term Control Plan (LTCP). Since this project has apparently progressed to the point of design, as reflected in the received drawings, then NYCDEP should be in a position to provide us with information on how the project will affect discharges to the canal. Specifically, in order to obtain an overall understanding of the project and better assess its impact to the Superfund project, we have the following questions:

o What is the exact nature of this project? o How will it affect discharges including pollutant loads to the canal? o What is the construction schedule? o Please provide documentation such as a facility plan, engineer's report, basis of design report, etc. that better describe the project.

Answers to some of these questions might also be provided by NYCDEP. We would appreciate it if you could consult with them and consolidate your responses.

The drawings identify the construction of an apron in front of the outfall.

o Dredging to install the apron in front of the outfall will disturb the soft sediments with a likely footprint larger than the 10'-0"x14'-0" area.

o Since the project will be in construction starting in 2013, which will be before Superfund dredging activities begin, the apron will need to be removed as part of the Superfund dredging and re-installed by NYCDEP or NYCDDC following Superfund construction activities.

o Additionally:

The depth of the apron appears to be set at the level of the natural bottom. What is that depth in relation to the dredging depth described in EPAs December 2011 Feasibility Study (FS) for the canal?

Other outfalls on the canal do not have aprons, why is the apron necessary here?

Are there NYCDEP or NYCDDC plans to install aprons at other Gowanus Canal outfalls?

Please let me know if you have any questions. We look forward to your responses.

Christos Tsiamis

Project Manager Central New York Remedial Section USEPA, Region 2 290 Broadway, 20th Floor New York, NY 10007

(212)637-4257

From: "Reddy, Krishna (DDC)" To: Christos Tsiamis/R2/USEPA/US@EPA Cc: "Saini, Gurdip (DDC)" , "Dharia, Purnima (DDC)" , "Franz, George (DDC)" , "Lago, Manuel (DDC)" Date: 10/03/2012 02:03 PM Subject: RE: FW: Carroll Street Bridge over Gowanus canal

_____

Christos, We are planning to bid the project by early January of 2013. If you can give us, the anticipate work by end of this year or early, it will be good for us. So that we can incorporate your work in this project. Thank you. Krishna Reddy, P.E. Engineer-In-Charge New York City Department of Design + Construction Infrastructure Design -1 (: (718) 391-2187 Fax: (718) 391-2278 [email protected] From: Christos Tsiamis [mailto:[email protected]] Sent: Monday, October 01, 2012 4:09 PMTo: Reddy, Krishna (DDC)Subject: Re: FW: Carroll Street Bridge over Gowanus canal Krishna,

we will take a look and we will let you know if we have any comments at this stage. Your specific questions can be better addressed after the release of the Proposed Plan for the cleanup of the Canal which we anticipate it will happen by the end of the year. Please, keep me posted on the progress of your project.

Thank you,

Christos Tsiamis

Project Manager Central New York Remedial Section USEPA, Region 2

(212)637-4257

From: "Reddy, Krishna (DDC)" To: Christos Tsiamis/R2/USEPA/US@EPA Cc: "Franz, George (DDC)" , "Lago, Manuel (DDC)" Date: 09/11/2012 10:34 AM Subject: FW: Carroll Street Bridge over Gowanus canal

_____

Attached are the sewer contract drawings for the outfall into the Gowanus Canal at the Carroll Street Bridge. Can please provide us the extent of dredging work to be done at this location, so as to coordinate during construction work. This project is scheduled to start construction late summer/fall of 2013 and is currently under design. Thanks Krishna Reddy, P.E. Engineer-In-Charge New York City Department of Design + Construction Infrastructure Design -1 (: (718) 391-2187 Fax: (718) 391-2278 [email protected] From: Reddy, Krishna (DDC) Sent: Wednesday, August 29, 2012 2:30 PMTo: 'Christos Tsiamis ([email protected])'Cc: Saini, Gurdip (DDC); Dharia, Purnima (DDC); Franz, George (DDC); Lago, Manuel (DDC)Subject: Carroll Street Bridge over Gowanus canal Hi Christos : We have to build a sewer outfall into the Gowanus Canal at the Carroll Street Bridge location as part of the SEK20065 sewer project for DEP. We met with NYC DOT Bridge Division officials and they enquired about the rip-rap and stone bedding at the outfall location(it is usually done at most outfall locations to alleviate any future scouring of the soil/sand layer of the water body at the mouth of the outfall). However, they referred to the dredging work is going on for the Gowanus Canal, which may interfere with sewer outfall work. Can please provide us the extent of dredging work to be done at this location, so as to coordinate during construction work. This project is scheduled to start construction late summer/fall of 2013 and is currently under design. Thanks Krishna Reddy, P.E. Engineer-In-Charge New York City Department of Design + Construction Infrastructure Design -1 (: (718) 391-2187 Fax: (718) 391-2278 [email protected] [attachment "SEK20065 Outfall.pdf" deleted by Christos Tsiamis/R2/USEPA/US]

SEK20065 Gowanus Canal Dwgs

From

Lago, Manuel (DDC)

To

Saini, Gurdip (DDC)

Cc

Reddy, Krishna (DDC)

Recipients

[email protected]; [email protected]

Attached are the latest drawings for SEK20065 High Level Storm Sewers in Gowanus Canal Area, Ph 1.

Manuel Lago

NYC Dept. of Design and Construction

Design Engineer

SEK20065 TL-SHT10 1-24-13.pdf

SEK20065 TL-SHT10 1-24-13.pdf

EXISTING SEWER

NEW STORM SEWER

LEGEND

SURFACE RUN-OFF DIRECTION

CONCRETE

BUILT

FIRE DEPARTMENT

TRAFFIC SIGN

CHAMBER

DOUBLE BARREL

MANHOLE

EXISTING SEWER LINE

WATER LINE OR STEAM MAIN

GAS LINE

ELECTRIC

NEW SEWER (UNDER 24"DIA.)

NEW SEWER (24" DIA. & LARGER)

BUILT MANHOLE

MANHOLE-WATER, ELECTRIC, TELEPHONE, FIRE

EXISTING CATCH BASIN

NEW CATCH BASIN - TYPE 1 (UNLESS OTHERWISE NOTED)

NEW DOUBLE CATCH BASIN

STREET LIGHT (METAL POLE)

UTILITY POLE

UTILITY POLE WITH STREET LIGHT

FIRE HYDRANT-HIGH PRESSURE, LOW PRESSURE

FIRE OR POLICE ALARM POST

FIRE ALARM BRACKET ON STREET LIGHT POLE

TREE

FENCE

GAS VALVE

F.A.

W.P.

B.S.

B.S.C., B.S.W.

D.C.

GRAN. BLOCK

GRAN. C.

F.T.R.C.

P.R.C.

BRK.

EXIST.

N.T.S.

C.C., C.W.

CONC.

BLT.

F.D.

T.S.

CH.

D.B.

MH

SANITARY SEWER

CLASS

DUCTILE IRON PIPE

SAN. SWR.

CL.

D.I.P.

FIRE ALARM

WORKING POINT

BLUE STONE

BLUE STONE CURB, BLUE STONE WALK

DROPPED CURB

GRANITE BLOCK

GRANITE CURB

FLAT TOP REINFORCED CONCRETE

PRECAST REINFORCED CONCRETE

BRICK

EXISTING

NOT TO SCALE

CONCRETE CURB, CONCRETE WALK

TRAFFIC FLOW

NEW MANHOLE

TELEPHONE

FIRE ALARM DUCT

BUILT MANHOLE REPLACED BY NEW MANHOLE

2 3

NEW CATCH BASIN REPLACING EXISTING BASIN

HYDRANT TO BE REMOVED

NEW VALVE

NEW REDUCER

4-WAY

3-WAY

NEW HYDRANT

'R'

1

LEGEND

2

SHEET NUMBER

#

7

8

5

4

3

6

CA

PIT

AL

P

RO

JE

CT

S

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20

00

65

, H

IG

H L

EV

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S

TO

RM

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IN

G

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US

C

AN

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A

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A, P

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1

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OR

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F B

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3

DEPARTMENT OF DESIGN + CONSTRUCTION

CARROLL STREET

BOROUGH OF BROOKLYN

HIGH LEVEL STORM SEWER

PLAN AND PROFILE

DIVISION OF INFRASTRUCTURE

BUREAU OF DESIGN

IN GOWANUS CANAL AREA, PHASE 1

CA

PIT

AL

P

RO

JE

CT

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20

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65

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3

3


CARROLL STREET

BOROUGH OF BROOKLYN


PLAN AND PROFILE


BUREAU OF DESIGN


CA

PIT

AL

P

RO

JE

CT

S

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20

00

65

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A, P

HA

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1

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OR

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LY

N


3RD AVENUE

BOROUGH OF BROOKLYN


PLAN AND PROFILE


BUREAU OF DESIGN


CA

PIT

AL

P

RO

JE

CT

S

EK

20

00

65

, H

IG

H L

EV

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S

TO

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IN

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AN

US

C

AN

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A

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CURVE DATA:

T = 5'-0"

R = 14.27'

L = 9.61'


3RD AVENUE

BOROUGH OF BROOKLYN


PLAN AND PROFILE


BUREAU OF DESIGN


CA

PIT

AL

P

RO

JE

CT

S

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20

00

65

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DENTON PLACE

BOROUGH OF BROOKLYN


PLAN AND PROFILE


BUREAU OF DESIGN


CA

PIT

AL

P

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JE

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S

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20

00

65

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3


PRESIDENT STREET

BOROUGH OF BROOKLYN


PLAN AND PROFILE


BUREAU OF DESIGN


CA

PIT

AL

P

RO

JE

CT

S

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20

00

65

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3

3

3


UNION STREET

BOROUGH OF BROOKLYN


PLAN AND PROFILE


BUREAU OF DESIGN


CA

PIT

AL

P

RO

JE

CT

S

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20

00

65

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3

3

3

3

3

3


SACKETT STREET

BOROUGH OF BROOKLYN


PLAN AND PROFILE


BUREAU OF DESIGN


CA

PIT

AL

P

RO

JE

CT

S

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20

00

65

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3


DEGRAW STREET

BOROUGH OF BROOKLYN


PLAN AND PROFILE


BUREAU OF DESIGN


CA

PIT

AL

P

RO

JE

CT

S

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20

00

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US

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SEK20065 OUTFALL DOUBLE 48 RCP.pdf

SEK20065 OUTFALL DOUBLE 48 RCP.pdf

barcode: *206410*barcodetext: 206410

nyc dep - bwso - us environmental protection agency · from: garin, james to: tsiamis, christos cc:...

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