Narrative_Addendum_4.docx

450GG Infrastructure Construction Solicitation GS-09P-16-KT-C-7006 Addendum #4 Changes Summarized 6/9/2016

1. (Ref. Addendum4_450 GG_Drawings-Vol.1)

· Sheet G001 revised Sheet Index to reflect the addition of new plans A402 and A403 that clarify the OA intake scope

· Note added to Sheets ADP1E, ADP1W, A1P1E, A1P1W, and A1P2 that clarifies painting scope for exterior finishes for equipment, penthouse walls and penthouse roof

· Note added to Sheets AP1E, AP1W and AP2 that clarifies scope of bid Option 4B penthouse wall replacement

· Anti-graffiti coating scope notes applied to elevation Sheets A201, A202 and A203

· Sheet A204 added note that clarifies painting scope for exterior finishes for equipment, penthouse walls and penthouse roof, a note that clarifies scope of bid Option 4B penthouse wall replacement

· Sheet A204 renames elevation titles to clarify Penthouse walls vs. Wing Walls

· Sheet A401 added a note for the re-installation of salvaged lifting eyes into new sidewalk panels

· Sheet A403 added a note for the addition of fall protection clip-in provisions for the (2) deconstructable OA intake locations at bays 4-5 and 15-16 to facilitate the removal and replacement of shaft enclosure vertical walls and a a note to salvage existing lift rings from concrete side walk panels for re-use in new panels

· New sheets A402 and A403 that further clarifies the OA intake scope

· Sheets A404 and A406 added notes to OA intake sections for the addition of a fall protection provision

· Sheet A407 makes OA intake stone cladding callout corrections

· Sheet A409 makes OA intake down spout termination revisions from the preceding Bid Set manifolded run to a single discharge near the area well floor drain to having each down spout terminate at a specified height above area well grade

· Sheet A502 provides OA intake roof fixed panel and removable panel sheet metal gauge clarification

· Sheet A609 Cooling Tower Platform General Notes revised to clarify the stripping of paint to be only as required to execute the salt corrosion repairs

· Sheet A901 Penthouse wall elevation clarifies penthouse wall vs. wing wall locations

· Sheets S201 & S02 added note to expose the existing walls below OA intake walls for the addition of multiple base plates

· Sheet S301 added a section callout existing section 17 on sheet S701 to clarify OA intake steel construction requirements

· Sheet S701, section 17 added section 8 callout referring to existing section 8 on this same sheet

· Sheet S702, section 1 renamed from Bid Set's, ""Pre-Cast Sidewalk Panel" to "Sidewalk Panel" and section includes lifting eye requirements

· Sheet HM1M1 & HM1P1W hazmat sheets added a note requiring Mezzanine level asbestos containment provisions if roof scope work means and methods result in vibration loosening Mezzanine ACM fireproofing

2. (Ref. Addendum4_450 GG_Drawings-Vol.2)

· All sheets include final egress plan load revisions reduced from previous Addendum #2 (Ref. Only)

3. (Ref. 000110 toc add04)

· Highlights the specifications below revised under this Addendum #4

4. (Ref. 074113 mc metal roof panels add04)

· Section 2.4 D. 6 added requirements to make OA intake rain leader downspouts demountable and similar note added to revised Section 3.3 F.1.

5. (Ref. 099100 mc painting add04)

· Added sub-paragraph 1.2 B. 6. referring to Drawings, Sheet A1P2 for scope of painting at roof areas.

6. (Ref. 099100a mc paint schedule add04)

· A Paint Schedule was added for both Interior and Exterior finishes

7. (Ref. 012700 unit prices new add04)

· Section C.3., Unit Price Item No. 3, Insulation Replacement and ACM unit price quantities were reduced due to learning of prior ACM Abatement scope projects (1987 to 1994) included ACM riser insulation abatement and replacement in shaft walls, but only performed on floors 1 through 15. This indicates that the conditions discovered in the Exploratory Demolition scope performed by others for this project in Stairs 1 & 2 on the landing between floors 5 & 6 should be assumed typical for floors 1 through 15.. (See Exploratory Demolition Photos provided with this Addendum #4)