Amendment_W912WJ18Q0052-0001.pdf

W13G86735340380001

AMENDMENT OF SOLICITATION/MODIFICATION OF CONTRACT

Except as provided herein, all terms and conditions of the document referenced in Item 9A or 10A, as heretofore changed, remains unchanged and in full force and effect.

15A. NAME AND TITLE OF SIGNER (Type or print)

30-105-04EXCEPTION TO SF 30

APPROVED BY OIRM 11-84

STANDARD FORM 30 (Rev. 10-83) Prescribed by GSA

FAR (48 CFR) 53.243

Amendment is necessary to provide the site visit attendee list, provide questions and answ ers from the site visit, and to provide revised plans, the dive report and video, and a topographic survey of the scour area.

Closing remains May 4, 2018 at 5:00 PM. All other conditions remain unchanged.

1. CONTRACT ID CODE PAGE OF PAGES

1 3

16A. NAME AND TITLE OF CONTRACTING OFFICER (Type or print)

16C. DATE SIGNED

BY 25-Apr-2018

16B. UNITED STATES OF AMERICA15C. DATE SIGNED15B. CONTRACTOR/OFFEROR

(Signature of Contracting Officer)(Signature of person authorized to sign)

8. NAME AND ADDRESS OF CONTRACTOR (No., Street, County, State and Zip Code) X W912WJ18Q0052

X 9B. DATED (SEE ITEM 11)

11-Apr-2018

10B. DATED (SEE ITEM 13)

9A. AMENDMENT OF SOLICITATION NO.

11. THIS ITEM ONLY APPLIES TO AMENDMENTS OF SOLICITATIONS

X The above numbered solicitation is amended as set forth in Item 14. The hour and date specified for receipt of Offer is extended, X is not extended.

Offer must acknowledge receipt of this amendment prior to the hour and date specified in the solicitation or as amended by one of the following methods:

(a) By completing Items 8 and 15, and returning 1 copies of the amendment; (b) By acknowledging receipt of this amendment on each copy of the offer submitted;

or (c) By separate letter or telegram which includes a reference to the solicitation and amendment numbers. FAILURE OF YOUR ACKNOWLEDGMENT TO BE RECEIVED AT THE PLACE DESIGNATED FOR THE RECEIPT OF OFFERS PRIOR TO THE HOUR AND DATE SPECIFIED MAY RESULT IN

REJECTION OF YOUR OFFER. If by virtue of this amendment you desire to change an offer already submitted, such change may be made by telegram or letter, provided each telegram or letter makes reference to the solicitation and this amendment, and is received prior to the opening hour and date specified.

12. ACCOUNTING AND APPROPRIATION DATA (If required)

13. THIS ITEM APPLIES ONLY TO MODIFICATIONS OF CONTRACTS/ORDERS.

IT MODIFIES THE CONTRACT/ORDER NO. AS DESCRIBED IN ITEM 14.

A. THIS CHANGE ORDER IS ISSUED PURSUANT TO: (Specify authority) THE CHANGES SET FORTH IN ITEM 14 ARE MADE IN THE

CONTRACT ORDER NO. IN ITEM 10A.

B. THE ABOVE NUMBERED CONTRACT/ORDER IS MODIFIED TO REFLECT THE ADMINISTRATIVE CHANGES (such as changes in paying office, appropriation date, etc.) SET FORTH IN ITEM 14, PURSUANT TO THE AUTHORITY OF FAR 43.103(B).

C. THIS SUPPLEMENTAL AGREEMENT IS ENTERED INTO PURSUANT TO AUTHORITY OF:

D. OTHER (Specify type of modification and authority)

E. IMPORTANT: Contractor is not, is required to sign this document and return copies to the issuing office.

14. DESCRIPTION OF AMENDMENT/MODIFICATION (Organized by UCF section headings, including solicitation/contract subject matter where feasible.)

10A. MOD. OF CONTRACT/ORDER NO.

2. AMENDMENT/MODIFICATION NO. 5. PROJECT NO.(If applicable)

6. ISSUED BY

3. EFFECTIVE DATE

25-Apr-2018

CODE

U S ARMY ENGR DISTRICT, NEW ENGLAND

696 VIRGINIA RD

CONCORD MA 01742-2751

W912WJ 7. ADMINISTERED BY (If other than item 6)

4. REQUISITION/PURCHASE REQ. NO.

CODE

See Item 6

FACILITY CODECODE

Sheila.M.Winston@usace.army.milEMAIL:978-318-8159TEL:

SHEILA M WINSTONVINCUILLA / CONTRACT SPECIALIST

W912WJ18Q0052

SECTION SF 30 BLOCK 14 CONTINUATION PAGE

SUMMARY OF CHANGES

SECTION J - LIST OF DOCUMENTS, EXHIBITS AND OTHER ATTACHMENTS

The following have been added by full text:

ATTACHMENTS

Revised Plans, Dive Report, and Topographic Map of Scour Area will be provided at the end of this amendment. A link to the dive video will be separately uploaded to FBO.gov.

QUESTIONS AND ANSWERS

Scour Repair Townshend Lake Dam, Townshend, VT

W912WJ18Q0052, AM 0001

Pre-Bid Site Visit, 20 April 2018, 11:00 am

Questions and Answers

1. Question: What is the preferred time of year to perform the work?

Answer: August or September when flows tend to be lower

2. Question: Can the Contractor control the flow of water past the project site?

Answer: No. But the Corps can regulate the water by using the flood control gates in the gate tower.

However, the Corp is required to maintain a minimum flow, called the Aquatic Base Flow (ABF) downstream to protect aquatic species. ABF is 160 cubic feet per second (cfs). A rough comparison of depth of water produced by various flows is shown on Plan Sheet G-101. Water depth can typically be restricted such that the depth of the water at the project site will be 3 feet or less. Flows through the outlet works at the time of the pre-bid site visit were estimated at 1200 cfs. When flows are restricted through the use of the gates, water builds up in the upstream lake (pool). This is called impoundment. Approximately 4 feet of impoundment over normal pool level will be acceptable; however, with recreation areas open until Labor Day, an additional 4 feet of impoundment over normal pool level will not be feasible. With coordination with the State of VT, the Corps may get permission to completely shut off flow for one hour at a time. Flows would be shut off for one hour, then ABF would be released for an hour, and cycled as such as needed.

3. Question: What would the required height of the cofferdam be?

Answer: As shown by the table on Plan Sheet G-101, the water height will be restricted to 3 feet or less, depending upon weather conditions. All efforts will be made to keep flows under this height.

4. Question: Where is the scour located?

Answer: The scour is located at the bottom of the concrete wall, as shown on the contract drawings.

There is a concrete apron at the base of the wall. Details of the concrete apron are shown on the Information Drawings, which are now attached to the end of the design Drawings. A tremie pour was previously performed on the apron near the scour location and dive results indicate that some of this tremie pour material is still present. See Dive Report attached, and MP4 file “Dive”, which is the 10-minute long video of the dive inspection.

5. Can the Corps provide the bathymetric survey results?

Answer: Yes. See the attached aerial photo with data point elevations shown. XYZ files can be provided upon request.

6. Can a copy of the dive report from September 2016 be provided?

Answer: Yes. See the attached report.

7. What were conditions like during the dive?

Answer: The Dive was conducted in September 2016. The flow was low, and the water depth was about 3 feet.

8. What is the access to the site for the Contractor?

Answer: As shown on Plan Sheet G-101, Contractors can access the east side of the work site from the dirt road labeled as “Approximate Ingress/Egress Location”. There is a large graveled parking area to the east of the

W912WJ18Q0052

outlet works discharge channel adjacent to the work site. Contractors should not utilize the recreation area parking lot on the west side of the outlet works, as this area is heavily used by the public. However, if the Contractor deems the west side of the discharge channel as the best location to site a crane, the Contractor should be aware that conduits are present underneath the access road on this side, so the road would need to be plated to protect the conduits whenever the crane or other heavy equipment was to drive on this road.

9. Would there be access for a barge?

Answer: Yes, there is a ramp into the channel further downstream. However, barge access would be dependent on the water levels (depth) and the draft of the barge. There would also be additional safety requirements in accordance with EM 385-1-1.

10. Question: How much water is over the scour?

Answer: As shown on the Contract Plan Sheet G-101, there is an estimated two to three feet of water over the top of the scour void area at normal pool level.

11. Question: Will shotcreting be allowed?

Answer: Contractors should follow the Plans and Specs as included in the Solicitation.

12. Question: Is reinforcement of the concrete specified?

Answer: Yes. As described on Plan Sheet S-301, reinforcing steel is to be placed in the front 18 inches of the void repair, and within the protective collar.

SITE VISIT ATTENDEES

Site Visit Attendee List:

Timothy Calabrese Edward Paige Corp. 617-935-3488 tcalabrese@edwardpaige.com Alan G. Aulson The Aulson Co., Inc. 508-451-1987 aaulson@aulson.com Craig Roy The Aulson Co., Inc. 207-240-6482 c.roy@aulson.com Janet Patev USACE 978-318-8003 janet.l.patev@usace.army.mil Dale Berkness USACE 978-318-8459 dale.h.berkness@usace.army.mil Matthew Underwood USACE 978-318-8460 matthew.j.underwood@usace.army.mil Jennifer Samela USACE 978-318-8324 jennifer.m.samela@usace.army.mil

(End of Summary of Changes)

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DESIGN FILESHEET NO.

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SHEET TITLE

COVER SHEET AND INDEX OF DRAWINGSCON-TO-461_G-001.dwg

INDEX OF DRAWINGS

S-201 CON-TO-461_S-201.dwg

CONCRETE REPAIRS - ELEVATIONS

S-301

CON-TO-461_G-101.dwg

CON-TO-461_S-301.dwg

G-101 GENERAL PLAN AND GENERAL NOTES

CONCRETE REPAIR SECTIONS AND DETAILS

S-101 CON-TO-461_S-101.dwg SITE PLAN

NEW

YORK

ARLINGTON

PAWLET

DANBY

WESTON

LONDONDERRY

GRAFTON

BONDVILLE

RAWSONVILLE

VERMONT

JAMAICA

WARDSBORO

POWNAL CENTER

BENNINGTON

MASSACHUSETTS

JACKSONVILLE

WILMINGTON

BRATTLEBORO

MARLBORO

LOCATION

PROJECT

TOWNSHEND

WEST TOWNSHEND

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HAMPSHIRE

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CAMBRIDGEPORT

SPRINGFIELD

LUDLOW

LOCATION MAP

SCALE: NTS

B1

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INTAKE

STRUCTURE

SPILLWAY

WEIR

GRAVITY

WALL

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TOWNSHEND DAM LAKE

VICINITY MAP

SCALE: NTS

B4

N

SOLICITATION NO.: W912WJ18Q0052

CONTRACT NO.:

ISSUE DATE: APRIL 2018

SHEET NO. SHEET TITLE

INDEX TO INFORMATION RECORD DRAWINGS

CT-1-5344

CT-1-5309

CT-1-5345

OUTLET WORKS EXCAVATION AND FILL PROFILE

CONDUIT CONCRETE, DISCHARGE TRANSITION AND STRUCTURE

CONDUIT REINFORCEMENT, TRANSITION

CT-1-5347 CONDUIT REINFORCEMENT, TRANSITION STRUCTURE

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US Army Corps of Engineers

New England District

TOWNSHEND LAKE DAM

TOWNSHEND, VERMONT

CONCRETE WALL SCOUR REPAIR

The orange area highlights the approximate location of the void identified beneath the downstream left-bank retaining wall

Townshend Dam, VT Dive Inspection

13 SEP 2016

The void identified on 13 Sep 2016 is described as follows:

1) The horizontal void begins approx. 18” below the water line shown in this picture.

2) The void runs from the contact (corner) of the left concrete retaining wall and the outlet works exit structure, downstream to the rock outcrop shown in the picture.

3) The void is approx. 7 feet in length and >7+ feet in depth. Vertical height of the void ranges from 6 inches to >2 feet.

The void identified on 13 Sep 2016 is described as follows:

1) The horizontal void begins approx. 18” below the water line.

2) The void runs from the contact (corner) of the left concrete retaining wall and the outlet works exit structure, downstream to the rock outcrop.

3) The void is approx. 7 feet in length and >7+ feet in depth. Vertical height of the void ranges from 6 inches to >2 feet.

Max void depth >7 feet

Max Void Height ~2 feet

Left retaining wall

Rip-Rap back fillLeft Bank, approx slope (looking downstream)

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454.3

458.4

452.3

464.6

465.3

446.2

442.3

452.4

443.5

451.4

452.2

455.3

437.9

441.2

441.8

444.9

457.9

457.31

455.01

455.42

454.47

457.54

453.63 454.76

455.39

453.06

452.46

452.99

453.73

453.82

452.94452.54

459.51

452.61

455.09

453.51

453.92

453.92

452.58

454.92

452.75452.13452.34

460.19

451.76

452.68

460.89

456.62

465.88

459.19

466.73

451.82

455.67

460.85

466.89

463.36

457.81

455.88

456.83

467.76

455.36

456.56

458.79

469.72

451.02

454.38

450.39

453.37

471.67

454.53

456.49

447.87

461.01

450.75

455.77

474.46

447.16

452.65

460.69

475.33

462.87

445.71

445.72

452.32

452.71

445.49

442.36

441.01

475.26472.94

451.79

472.96

438.17

451.38

464.55463.32

452.28

441.57

451.32

446.08

438.38

455.52

470.47469.45

463.66

455.77

457.16

446.07

459.42

440.09

455.93

441.25

442.04

441.32

455.34

460.39

444.52

445.72

456.15

448.36

462.35

469.29

449.92

443.12

454.98

460.16

443.79

457.23

462.42

445.06

445.74

459.32

444.96

445.72

456.31

449.42

444.68

442.76

458.03

462.45

444.38

448.51

448.54

457.97

445.63

446.31

462.26

461.93

455.32

455.16

461.55

458.41

461.49

0 60 120 180 24030

Feet

Notes:

Horizontal Datum: Vermont State Plane NAD83 US Survey Feet Vertical Datum: NAVD88 US Survey Feet

Completed: September 2016 by NAE Survey Section Method: Traditional Survey Equipment: Trimble Base Station on Control Point T-4 Reference: Survey Book FC-867

By: WTL on 24 January 2017

Townshend Dam West River

Townshend, Vermont

Topographic Survey of Scour Area