ADDENDUM NO. 1 - RETAINING WALL REPLACEMENT AT GREENBURGH DPW YARD.pdf

TOWN OF GREENBURGH

BUREAU OF ENGINEERING

177 Hillside Avenue, White Plains, NY 10607 Office: (914) 989-1583 Fax: (914) 989-1639 Web Site: http://www.greenburghny.com

Greenburgh Recycles

FRANK MORABITO CJ GELARDO, P.E.

Commissioner of Public Works Deputy Town Engineer

July 29, 2026

ADDENDUM #1

TO THE BID DOCUMENTS FOR THE

“RETAINING WALL REPLACMENT AT TOWN OF GREENBURGH DPW YARD”

TO: ALL BID DOCUMENT HOLDERS:

CHANGES:

1. PLANS – SHEET S-09 – REVISED

2. BID SHEETS C1-C2 – REVISED

3. SPECIFICATION SECTION 07 92 00 – NEW

4. CONSTRUCTION DURATION SHALL BE 6 MONTHS ONCE CONTRACTOR MOBILIZES ON-SITE

ADDITIONAL INFORMATION:

1. SEE ATTACHED RESPONSE TO QUESTIONS RECIVED

2. SEE ATTACHED SIGN-IN SHEET FROM WALK THROUGH HELD 7/20/2026

Received. acknowledged, and conditions agreed to this _______ (day) of _______________________ (month), 2026

BIDDER:__________________________________________________________________________________

Surveyors Engineers

Construction Managers

KSE

KS ENGINEERS, P.C.

494 Broad Street, 4th Floor, Newark, N.J. 07102

Phone: (973) 623-2999, Fax: (973) 242-2955

RETAINING WALL REPLACEMENT TOWN OF

GREENBURGH DPW YARD

AutoCAD SHX Text 10'-0"

AutoCAD SHX Text 10'-0"

AutoCAD SHX Text SOLDIER PILE W14x159 ITEM 552.2201 (TYP.)

AutoCAD SHX Text

PARTIAL PLAN DETAIL

AutoCAD SHX Text

AutoCAD SHX Text S-05

AutoCAD SHX Text

AutoCAD SHX Text

AutoCAD SHX Text

AutoCAD SHX Text

SCALE: 1"=1'-0"

AutoCAD SHX Text

%%UTYPICAL CAP BEAM PLAN

AutoCAD SHX Text #6

AutoCAD SHX Text

AutoCAD SHX Text

AutoCAD SHX Text

AutoCAD SHX Text

SCALE: 1"=1'-0"

AutoCAD SHX Text SOLDIER PILE AND CAP BEAM CONNECTIONS WITH 34" GALVANIZED BOLT AT ENDS OF CAP BEAM(NON-SLIP CRITICAL) (TYP.)

AutoCAD SHX Text

PRECAST LAGGING ITEM 207.26

AutoCAD SHX Text

3-#6 EACH FACE

AutoCAD SHX Text

STUD (TYP.)

AutoCAD SHX Text 34"x15"x15" STEEL PLATE OVER SOLDIER PILE (TYP.)

AutoCAD SHX Text

2'-6" TEMPORARY STEEL CASINGINCLUDED IN ITEM 552.2001

AutoCAD SHX Text

SOLDIER PILE & CASING (TYP.)

AutoCAD SHX Text 2'-3"

AutoCAD SHX Text 2'-3"

AutoCAD SHX Text INSTALL GEOTEXTILE SUBSURFACE DRAINAGE FILTRATION TO PREVENT SOIL FROM MIGRATING THROUGH THE WALL ITEM 207.26

AutoCAD SHX Text

SHEET-APPLIED MEMBRANE WATERPROOFING

AutoCAD SHX Text

EL. 23.00

AutoCAD SHX Text

EL. 22.25

AutoCAD SHX Text DRILL 4x " HOLES WITH 6 " 78" HOLES WITH 634" EMBEDMENT LENGTH OR 4x " , 34" ,6 " LENGTH EMBEDMENT STUDS 34" LENGTH EMBEDMENT STUDS (IN PRECAST CAP) TO ACCEPT CHAIN LINK BASE PLATE

AutoCAD SHX Text 34" x6" STUD

AutoCAD SHX Text #6@ 12"

AutoCAD SHX Text

34" F3125 GRADEA325 BOLT

AutoCAD SHX Text 38"x3"x3" WASHWER

AutoCAD SHX Text

DRILL " HOLE IN THE FIELD78" HOLE IN THE FIELD

AutoCAD SHX Text

HP 14 ITEM 552.2201

AutoCAD SHX Text 34"x15"x15" STEEL PLATE OVER SOLDIER PILE

AutoCAD SHX Text

TYP.

AutoCAD SHX Text 516"

AutoCAD SHX Text

%%UPRECAST WALL CAP

AutoCAD SHX Text

AutoCAD SHX Text .5

AutoCAD SHX Text

AutoCAD SHX Text

AutoCAD SHX Text

SCALE: 1 "=1'-0"12"=1'-0"

AutoCAD SHX Text

1" CHAMFER (TYP.)

AutoCAD SHX Text

FRONT FACE

AutoCAD SHX Text 6 "x6 "x " STEEL PLATE12"x6 "x " STEEL PLATE12"x " STEEL PLATE12" STEEL PLATE

AutoCAD SHX Text

CAP

AutoCAD SHX Text

SOLDIER PILE & CASING

AutoCAD SHX Text

PROPOSED 3'-6" HIGH CHAIN LINK FENCE

AutoCAD SHX Text

EL. 22.00

AutoCAD SHX Text

NOTES:

AutoCAD SHX Text

1. PRECAST WALL CAP PAID UNDER NYSDOT ITEM PRECAST WALL CAP PAID UNDER NYSDOT ITEM 563.42000010 PRECAST CONCRETE PILE CAPS. 2. STEEL PLATE AND STUDS ARE CAST WITHIN THE STEEL PLATE AND STUDS ARE CAST WITHIN THE PRECAST CAP BEAMS.

AutoCAD SHX Text

%%UPRECAST CONCRETE LAGGING DETAIL

AutoCAD SHX Text

AutoCAD SHX Text

AutoCAD SHX Text

AutoCAD SHX Text

SCALE: 1"=1'-0"

AutoCAD SHX Text #5 @ 4"

AutoCAD SHX Text

#4 @ 6" (TYP.)

AutoCAD SHX Text

1" CHAMFER (TYP.)

AutoCAD SHX Text

OF

AutoCAD SHX Text

NO.

AutoCAD SHX Text

APPROVED

AutoCAD SHX Text

CHECKED

AutoCAD SHX Text

DRAWN

AutoCAD SHX Text

DESIGNED

AutoCAD SHX Text

APPVD.

AutoCAD SHX Text

REVISIONS

AutoCAD SHX Text

DATE

AutoCAD SHX Text

DRWN.

AutoCAD SHX Text

CHKD.

AutoCAD SHX Text

REVISIONS

AutoCAD SHX Text

DATE

AutoCAD SHX Text

NO.

AutoCAD SHX Text

DRWN.

AutoCAD SHX Text

CHKD.

AutoCAD SHX Text

APPVD.

AutoCAD SHX Text

SHEET

AutoCAD SHX Text

CONTRACT NO.

AutoCAD SHX Text

SCALE

AutoCAD SHX Text

DRAWING NO.

AutoCAD SHX Text

DATE

AutoCAD SHX Text Town of Greenburgh

AutoCAD SHX Text Bureau of Engineering

AutoCAD SHX Text 01/13/22

AutoCAD SHX Text 177 Hillside Avenue, AutoCAD SHX Text White Plains, NY 10607

AutoCAD SHX Text

AutoCAD SHX Text

AS NOTED

AutoCAD SHX Text

GA

AutoCAD SHX Text

GA

AutoCAD SHX Text

LS

AutoCAD SHX Text

VS

AutoCAD SHX Text

PROPOSED PILE CAP DETAILS

AutoCAD SHX Text S-09

AutoCAD SHX Text

AutoCAD SHX Text

AutoCAD SHX Text

AutoCAD SHX Text

AutoCAD SHX Text

AutoCAD SHX Text

AutoCAD SHX Text 2/24/22

AutoCAD SHX Text

ADDENDUM 3

AutoCAD SHX Text

C-1

SECTION C - BID SHEET

Retaining Wall Replacement at Town of Greenburgh DPW Yard

TOWN OF GREENBURGH, NY

NOTE: Unit prices include all work necessary to complete, in place, each listed item including, but not limited to, labor, materials and incidentals. Unit prices are to be written in both words and numbers. In case of a discrepancy, those shown in words shall govern. All prices are to be in dollars and cents.

ITEM

NO.

ESTIMATED

QUANTITY

UNIT

ITEM WITH UNIT PRICES

(IN WORDS)

UNIT PRICE

(IN NUMBERS)

EXTENSION

EST. QTY. X

UNIT PRICE

201.06 1 LS Clearing and Grubbing

Per Lump Sum

203.07 3,400 C.Y. Select Granular Fill

Per Cubic Yard

207.26 6400 S.F. Prefabricated Composite

Structural Drain

Per Square Foot

552.2001 630 L.F. Predrilled Holes for Piles - Casing

Required

Per Linear Foot

552.2101 160 L.F. Rock Sockets for Soldier Pile and

Lagging Wall

Per Linear Foot.

552.2201 1,400 L.F. Soldier Piles for Soldier Pile and

Lagging Wall

Per Linear Foot.

BID SHEET (continued)

C-2

ITEM WITH

UNIT PRICES

EXTENSION

EST. QTY. X

UNIT PRICE

552.230301 6,200 S.F. Precast Concrete Panel Lagging

For Soldier Pile and Lagging Wall

563.42000010 400 L.F. Precast Concrete Pile Caps

564.5100004 1 L.S. Miscellaneous Steel

595.50000018 6400 S.F. Sheet-Applied Waterproofing

Membrane

607.0511 400 L.F. Vinyl Coated Steel Chain-Link

Fence on Plastic Coated Frame

With Top Rail 4 Feet High

610.1402 180 C.Y. Topsoil - Roadside

Per Cubic Yard

BID SHEET (continued)

C-3

ITEM WITH

UNIT PRICES

EXTENSION

EST. QTY. X

UNIT PRICE

610.1601 1400 S.Y. Turf Establishment

Per Square Yard

661.7001001 1 L.S. Electrical Line Relocation

Allowance $50,000.00 $50,000.00

699.040001 1 L.S. Mobilization 4%

1 DC Miscellaneous Additional Work

Allowance $50,000.00 $50,000.00

206.05 6 EA Test Pits

Per Each

1 LS Site Restoration

TOTAL

(IN WORDS) (IN NUMBERS)

DPW Retaining Wall Replacement 07 92 00 - 1 Joint Sealants

SECTION 07 92 00

JOINT SEALANTS

PART 1 - GENERAL

1.01 SUMMARY

A. Section Includes: Sealant work.

B. Work included consists of but is not necessarily limited to:

1. Sealing all joints which will permit penetration of dust, air or moisture, unless sealing work is specifically required under other Specification Sections.

a. Work includes but is not limited to:

1) Joints between paving or sidewalks and building.

2) Concrete construction, control and expansion joints.

3) Other joints where sealant, expanding foam sealant or compressible sealant is indicated.

1.02 QUALITY ASSURANCE

A. Referenced Standards:

1. ASTM International (ASTM):

a. C834, Standard Specification for Latex Sealants.

b. C920, Standard Specification for Elastomeric Joint Sealants.

c. C1521, Standard Practice for Evaluating Adhesion of Installed

Weatherproofing Sealant Joints.

B. Qualifications: Sealant applicator shall have minimum five (5) years experience using products specified on projects with similar scope.

C. Mock-Ups:

1. Before sealant work is started, a mock-up of each type of joint shall be sealed where directed by the Engineer.

a. The approved mock-ups shall show the workmanship, bond, and color of sealant materials as specified or selected for the work and shall be the minimum standard of quality on the entire project.

b. Each sample shall cure for a minimum of seven (7) days at which time the sealant manufacturer's authorized factory representative shall perform adhesion tests on each sample joint.

1) Perform adhesion tests per ASTM C1521.

2) If mock-up is not acceptable or if adhesion test fails, provide additional mock-up and adhesion testing as required until acceptable to Engineer.

DPW Retaining Wall Replacement 07 92 00 - 2 Joint Sealants

1.03 DEFINITIONS

A. Defect(ive): Failure of watertightness or airtightness.

B. Finish sealant: Sealant material per this specification applied over face of compressible sealant or expanding foam sealant specified, to provide a finished, colored sealant joint.

C. Installer or Applicator:

1. Installer or applicator is the person actually installing or applying the product in the field at the Project site.

2. Installer and applicator are synonymous.

D. "Seal," "sealing" and "sealant": Joint sealant work.

1.04 SUBMITTALS

A. Shop Drawings:

1. Product technical data including:

a. Acknowledgement that products submitted meet requirements of standards referenced.

b. Manufacturer's installation instructions.

c. Manufacturer's recommendations for joint cleaner, primer, backer rod, tooling and bond breaker.

2. Certification from sealant manufacturer stating product being used is recommended for and is best suited for joint in which it is being applied.

3. Certification of applicator qualification.

B. Test Results:

1. Provide adhesion test results for each sealant sample including adhesion results compared to adhesion requirements.

2. Manufacturer's authorized factory representative recommended remedial measures for all failing tests.

C. Samples:

1. Cured sample of each color for Engineer's color selection.

2. Color chart not acceptable.

1.05 DELIVERY, STORAGE, AND HANDLING

A. Deliver material in manufacturer's original unopened containers with labels intact: Labels shall indicate contents and expiration date on material.

PART 2 - PRODUCTS

2.01 ACCEPTABLE MANUFACTURERS

A. Subject to compliance with the Contract Documents, the following manufacturers are acceptable:

DPW Retaining Wall Replacement 07 92 00 - 3 Joint Sealants

1. Compressible sealant:

a. Schul International Corporation.

b. Emseal.

c. Norton.

d. Sandell.

e. Or Approved Equal.

2. Expanding foam sealant:

a. Macklanburg Duncan.

b. Convenience Products.

c. FAI International, Inc.

d. Or Approved Equal.

3. Backer rod, compressible filler, primer, joint cleaners, bond breaker: As recommended by sealant manufacturer.

B. Submit request for substitution.

2.02 MATERIALS

A. Sealants - General:

1. Provide colors matching materials being sealed.

2. Where compound is not exposed to view in finished work, provide manufacturer's color which has best performance.

3. Nonsagging sealant for vertical and overhead horizontal joints.

4. Sealants for horizontal joints: Self-leveling pedestrian/traffic grade.

5. Joint cleaner, primer, bond breaker: As recommended by sealant manufacturer.

6. Sealant backer rod and/or compressible filler:

a. Closed cell polyethylene, polyethylene jacketed polyurethane foam, or other flexible, nonabsorbent, non-bituminous material recommended by sealant manufacturer to:

1) Control joint depth.

2) Break bond of sealant at bottom of joint.

3) Provide proper shape of sealant bead.

4) Serve as expansion joint filler.

B. Compressible Sealant:

1. High-density, open micro-cell polyurethane foam impregnated with a hydrophobic, flame retardant, modified acrylic.

a. Sealtite Standard by Schul International Corp.

b. Or Approved Equal.

2. Adhesive: As recommended by sealant manufacturer.

DPW Retaining Wall Replacement 07 92 00 - 4 Joint Sealants

PART 3 - EXECUTION

3.01 PREPARATION

A. Before use of any sealant, investigate its compatibility with joint surfaces, fillers and other materials in joint system.

B. Use only compatible materials.

C. Where required by manufacturer, prime joint surfaces.

1. Limit application to surfaces to receive sealant.

2. Mask off adjacent surfaces.

3.02 INSTALLATION

A. Install products in accordance with manufacturer's instructions and UL requirements.

B. Clean all joints.

C. Make all joints water and airtight.

D. Provide correctly sized backer rod, compressible filler or compressible sealant in all joints to depth recommended by manufacturer:

1. Take care to not puncture backer rod and compressible filler.

E. Apply bond breaker where required.

F. Install compressible sealant to position at indicated depth.

1. Size so that width of material is twice joint width.

2. Take care to avoid contamination of sides of joint.

3. Protect side walls of joint (to depth of finish sealant).

4. Install with adhesive faces in contact with joint sides.

5. Install finish sealant where indicated.

3.03 SCHEDULE

A. Furnish sealant as indicated for the following areas:

1. Compressible sealant: Where indicated.

END OF SECTION

1. Can someone take a look at this and see if we can in fact bench back into the slope to allow for the installation of the new piles?

Answer: Please see answer to Question No. 2

2. Has the engineer explored any other options for a wall design that might minimize the equipment size required to construct to remain within the present area between the building and the wall?

Answer: Contractors shall bid the project according to the Contract Documents.

The Town will evaluate value engineering proposals from the selected contractor for conformance to project requirements. Value engineering proposals needs to signed and sealed by a Professional Engineer licensed in New York State.

3. The details on sheet S-09 call out a rubberized joint sealant between the precast casts, however, no product is specified and the spec book is missing section 07 92 00 which is the joint sealant section. Please provide us the required joint sealant.

Answer: See Spec section 07 92 00 attached. Please refer to revised sheet S-09 in the addendum.

4. The details on sheet S-09 call out a bolted attachment between the precast pile cap and the steel pile. Are there any special requirements for the nuts, bolts and washers? (ie.

Galvanized, stainless,…) Please advise.

Answer: The detail on sheet S-09 states galvanized bolts.

5. Please provide additional information for the relocation of the electrical line-

a. Where is it being relocated to?

b. Is it underground or overhead?

c. If it is underground, please provide details for the trench.

d. Can we test pit the electric to locate conflicts and then shift the alignment of the piles and lagging as required in lieu of relocating the electric?

Answer: A $50,000 allowance has been allocated for the electrical work. The selected contractor will work with the Town for the proposed electrical work.

6. Please clarify that there aren’t any clearing restrictions.

Answer: There are no restrictions.

7. Can the root mass be left on the slopes after the clearing is complete to help with slope stabilization?

Answer: Yes

8. There are (2) existing telephone poles located at the back of the DPW building within the work area. Can they be removed to provide some extra space within the work area?

Answer: Please see answer to Question No. 5

9. Please confirm that DPW will be removing the storage container, road sanders and any other obstructions within the work zone.

Answer: This shall be coordinated with DPW before mobilization.

10. Please confirm that the continuous 8” x 8” x ½” “L” (item 564.51000039 as labelled on the plans) is only required from Pile #5 to Pile #8.

Answer: This is correct. Please refer to sheets S-05 and S-08.

11. Sheet S-08 shows the concrete shaft for the foundation stopping approximately 1’ below grade to allow for the lagging to be recessed, however, no detail has been provided for the infill of the slot trench we will need to excavate to allow for this installation. Please provide a detail.

Answer: The slot in front of the lagging shall be filled with concrete to the roadway surface.

12. The existing paved surface is broken up and not consistence thru the work area. The equipment required to construct the wall will likely breakup the balance of the paved area.

At the end of the project will an Item-4 surface be acceptable or will it need to be repaved?

Please provide details for restoration.

Answer: The Contractor shall restore the damaged paved area to existing condition.

Paid under site restoration.

13. Please confirm that the scales are correct for the sections and the details on sheet S-

08. We are coming up with significant diƯerences in quantities and it may be a discrepancy with the scales.

Answer: Quantities of material installed will be documented by the inspector and paid accordingly to the Contractor based on unit price.

14. Are there any finish coatings required on the exposed steel of the soldier piles?

Answer: Soldier piles shall be galvanized. Please refer to Specification 32 32 43 item

2.01 F.

15. Does the DPW have a disposal location available for the drill spoils?

Answer: Contractor to determine the disposal location.

16. Please confirm that work can continue in the winter as long as snow removal operations are not impeded.

Answer: Confirmed

17. Does DPW plow the work area, or is it allowed to “snow-over” during the winter?

Answer: DPW does not plow the work area.

18. The sections on S-08 show the swale being for under 203.07, select granular fill, however, there is no information provided for size of stone filling required for this item (ie. Fine or light, medium…). Please provide a material type for stone swale granular product.

Answer: Select granular fill shall conform to NYSDOT specification 203.07 and gradation shown in Table 733-11A.

19. Please provide the clearing and restoration limits on the slope.

Answer: The Clearing and restoration limits are depicted by the limits of structural fill and turf establishment.

20. What is the scope of work associated with the Electrical Line Relocation?

Answer: Please refer to question 5.

21. The original bid from 2022 had an item for Test Pits (item 206.05) and Site Restoration. Are these items no longer to be included in the bid?

Answer: Items added.

22. The plans call for test pits to locate the water line. How are the test pits to be paid?

Answer: Test pit item added.

23. How will Site Restoration be paid?

Answer: Site Restoration item added.

24. It appears that none of the revisions that were made with the addendum to the original plans and specs from 2022 were included in this proposal? (Sheet S-09).

Will all of these items be addressed in an addendum to this bid?

Answer: Revised sheet S-09 included in this addendum.

25. For the precast cap, one of our precast vendors brought to our aƩenƟon that the detail shown in the plans is for a CIP wall cap. The studs on the 3/4" steel cap plate would not be able to be incorporated into a separate precast cap.

a. Please confirm if this cap should be precast or CIP. If it is to be precast, this detail will need to be revised to a precast detail.

Answer: The cap could be cast-in-place paid per linear foot under item 563.42000010.

26. Item # 661.7001001 Electrical Line Relocation

a. Regarding the electrical line relocation during the pre bid meeting was mentioned may have possibly been relocated already if so is that confirmed? If not where is the line is it overhead or underground etc. Where is it getting relocated too. Thank you

Answer: Please refer to question 5.

D. "Seal," "sealing" and "sealant": Joint sealant work.

3. Backer rod, compressible filler, primer, joint cleaners, bond breaker: As recommended by sealant manufacturer.

B. Submit request for substitution.

2. Adhesive: As recommended by sealant manufacturer.