HomeMy WebLinkAbout150304_Addendum #1CORNELL UNIVERSITY CLARA DICKSON HALL
FACILITIES CONTRACTS WASTE & STORM LINE REPLACEMENT
121 HUMPHREYS SERVICE BUILDING
ITHACA, NEW YORK 14853-3701
ADDENDUM NO.1
March 4, 2015
This Addendum contains changes to the requirements of the Contract Documents and Specifications. Such changes are to be incorporated into the Construction Documents and shall apply
to the work with the same meaning and force as if they had been included in the original document. Wherever this Addendum modifies a portion of a paragraph of the specifications or
a portion of any Drawing, the remainder of the Paragraph or Drawing shall remain in force.
NOTE: Provisions of all Contract Documents apply.
In the Specifications:
In Specification Section 01 14 00 – Work Restrictions, Part 1.11 Working Hours, Subpart B:
ADD Subparagraph 2. as follows:
2. The Contractor shall assume that the Contractor will be able to work any time in the period from 6:00 a.m. to dusk, Monday through Saturday in the half of Clara Dickson Hall which
is under construction for this Project. It is noted that the opposite side of the building will remain occupied by office staff and for summer activities and camps. On the Ground Floor,
the Contractor shall erect a suitable temporary corridor partition with a hinged door and dust migration seal around the pipes above to isolate the work area from the elevator lobby
and south side of the building. On the upper floors, the Contractor shall place saw-horse barricades north of building center with signage, indicating “No Admittance. Hard Hat Area
- Work Area”.
In Specification Section 01 50 00 – Temporary Facilities and Controls, Part 1.5 Temporary Enclosures:
ADD Subpart C as follows:
Provide temporary dust and dirt control measures as follows:
Using a quality sealing tape which will remain in place during construction, but which will not pull paint or leave residue when removed, tape doors, edges and bottoms for all doors
to student rooms and non-work area rooms adjacent to the work area and along the corridor where the work is occurring.
Prior to commencing floor saw cutting, grinding, floor removal, excavation, or backfill, enclose the work area in polyethylene sheeting, minimum 4 mil thickness. Fasten securely.
Provide a ducted air supply at one end of the work area and a filtered negative air machine at the opposite end of the work area, both ducted to outdoors. (A HEPA negative air machine
is not required.)
For the Contractor’s reference, photographs of a pilot project previously performed at Clara Dickson Hall are attached for reference. These were also handed out at the Pre-Bid Walk-Through.
This dust and splash protection on the side walls proved adequate and was effective in keeping concrete splatter and dust from the adjacent areas. However, the hanging closure at the
far end was not effective and allowed dust to migrate to non-work areas, causing Contractor expense in having to clean all the rooms. The Contractor for this project shall provide suitable
temporary framing to support closures and hinged self-closing doors, and other measures as required to prevent dust migration to non-work areas.
Note that the attached photos are provided for general information only. This excavation occurred at the far northeast end of one sanitary line where the line is shallowest. The line
generally pitches downward in the direction of the sewer.
In Specification Section 09 30 00 – Tile, Part 1:
ADD Subpart 1.10 as follows:
EXISTING CONDITIONS SPECIFICATION
Appended to this Specification is a copy of CU SAS Summer 2012 Specification 09 30 00 which covers the construction of Men’s First Floor Bathroom 1679. The Contractor shall assume that
all installations were made in accordance with this Specification.
The showers are constructed with a proprietary shower and waterproofing system per Part 2.09 and Part 3 of this Specification. All work in the current 2015 Project which affects these
shower units shall be installed in accordance with the requirements of the attached 2012 Specification.
In Specification Section 09 65 19 – Resilient VCT, Part 2.2 Resilient Tile Flooring Materials, Subpart A.:
REPLACE the words “EXCELON Feature Tile & Strips” WITH the words “EXCELON Standard Imperial Texture, 12˝ x 12˝ x c˝. Color(s) to be selected by Owner.”
In Specification Section 09 68 00 – Carpeting:
ADD Part 2.6 as follows:
BASIS OF DESIGN
A. Basis of Design carpet tile shall be Interface Modular Commercial Carpet Tile, Cubic – 4855 Optic.
In Specification Section 09 68 00 – Carpeting:
DELETE Part 3.1 – Pre-Installation Requirements.
In Specification Section 31 23 16.13 - Trenching, Part 1.2 Work Included, Subpart B:
DELETE Item 8. “Owner Provided Dump Site” and INSERT new Item 8 as follows:
Disposal of Materials.
In Specification Section 31 23 16.13 - Trenching, Part 3.6 Disposal of Materials:
ADD Subpart B follows:
As the Basis of Bid, the Contractor shall include two separate dumpsters for excavated materials from inside the building.
Concrete chunks from the removed floor shall be placed in one dumpster. The Contractor shall endeavor to recycle the waste concrete material at a concrete recycling facility.
The other dumpster shall be lined with 10 mil polyethylene sheeting and shall receive the soil, pipe sections and cinder fill from the excavation inside the building.
During previous excavations in the building, the concrete floor was approximately 5 inches thick. Beneath the floor was a bedding material, black in color, approximately 6 to 8 inches
thick, which is believed by the Engineer to have been a cinder fill material. Beneath that was material appearing to be native soil. The Contractor shall assume that this material can
be disposed of in a non-hazardous landfill. However, the material may be tested by the Owner, prior to removal from site to confirm that the material does not contain sufficient levels
of contaminants, which would require the disposal in a special landfill. Any costs for testing of the material or extended hauling costs to a disposal in a special landfill shall be
borne by the Owner. Do not include in the Contractor’s bid.
In Specification Section 31 23 23.13 - Backfill, Part 2.2 Offsite Materials:
ADD Subpart G as follows:
Pea Gravel / #1A Stone:
#1A pea gravel or #1A crushed stone consisting of clean, durable, crushed or round stone conforming to ASTM-C33 for d inch aggregate. Clean, dried and free of organic/deleterious materials.
Material shall be NYS DOT #1A per Table 5.
TABLE 5
GRADATION REQUIREMENTS: GRAVEL/CRUSHED STONE
SIEVE SIZE
PERCENT PASSING BY WEIGHT
½˝
100
¼˝
90 - 100
d˝
0 - 15
On the Contract Drawings:
On Drawing P001 – Title Sheet, Symbols, Schedules, Notes & Details, Detail 1/P001:
INSERT a dimension on each side of sanitary or storm line to side of trench indicated as one pipe diameter minimum.
ADD the words “or Pea Gravel or NYS DOT #1A Crushed Stone” after the word “Stone Dust”.
ADD the words “or Pea Gravel or NYS DOT #1A Crushed Stone Consolidated with a Plate Tamper in 12 inch Lifts. Flowable Fill Shall Not be Acceptable in place of Compacted or Consolidated
Stone” after the words “Run of Crushed Limestone Compacted in 12 inch Lifts”.
On Drawing P001 – Title Sheet, Symbols, Schedules, Notes & Details, Detail 2/P001:
ADD the words “One Pipe Diameter Minimum” after the words “Varies (Typ)”.
ADD the words “NYS DOT Type 1A or 1” after the words “Crushed Stone”.
On Drawing P100 – Underfloor Piping Removal Plan – North:
ADD the note “Invert Elevation to Match Existing. Assume 48˝ Below Finished Floor” at the storm line exit at building foundation south of Column Line 59.
ADD the note “Pull 6˝ Existing Pipe Out of Existing Manhole. Insert Main Pipe and Repair Opening and Bench Walls with Non-Shrink Grout” at pipe entrance to existing sanitary
manhole.
ADD the note “Owner Will Relocate Restroom Lockers Out of Work Area” in Room 1538 Men’s Locker Room.
ADD the note “Owner Will Relocate Equipment Away From Work Area” in Room 1647 Maintenance.
ADD the note “Use Care to Avoid Damaging Pavements, Trees, and Building Finishes. Contractor Shall Be Responsible For Restoration of Damaged Areas. If Proper Care is Employed, Restoration
May Be Limited to Topsoil and Seed” adjacent the sanitary manhole.
On Drawing P100 – Underfloor Piping Removal Plan – North, Removal Notes:
ADD the following to Note 2:
“Pipe routing was developed from As-Built Drawings and was further inspected with TV and previously excavated at three locations. Contractor may assume piping routing shown is accurate.”
ADD Note 6. as follows:
“6. For basis of bidding, assume floor saw cuts will not encounter any in-slab conduits.”
ADD Note 7. as follows:
“7. Location of dumpsters shall be adjacent to Column Line 69 and minimum 10 feet from building. Location shall be coordinated with Cornell Project Manager. Dumpsters shall be
screened from view on the road side with 6΄ high pedestal metal fencing with green sight covers. Anchor fencing to minimize overturning due to wind.”
On Drawing P101 – Underfloor Piping Replacement Plan – North:
REVISE note at sanitary pipe exit through foundation wall as follows:
“Remove Exist 6˝ Sanitary Through Building Concrete Foundation Wall. If Hole is Oversized, Provide Pipe Sleeve per Detail 7/P001 and Seal with Non-Shrink Grout. If Opening is Clean
and Correct Size, Insert Pipe and Seal with Non-Shrink Grout.”
ADD Note 9. as follows:
“9. Contractor may assume that at locations where risers are adjacent building column foundations, piping will be one of the following:
Capable of removal and replacement without disturbance of structural foundations.
OR
Portion of piping not able to be removed will be reconnected and revised after review of the Engineer.
OR
Portion of pipe not able to be removed will be abandoned in place after review of the Engineer and a new pipe installed which clears the disturbance, and considered additional work if
significant re-work is required.”
RFI Questions and Clarifications
See attached RFI Log (Items 1 - 8)
Attachments: Photos
Specification 09 30 00 – Ceramic Tiling from CU SAS Summer 2012 Bathroom Alterations
****END OF ADDENDUM****