A-01 Attachment 3_Addendum to construction docs.docx

Wrangell Compound HVAC Replacement Phase 2 1240BJ22R0007

Addendum to Plans and Specs This addendum modifies the construction drawings and project specifications

Date of Addendum: 3-3-2022

1. Sheet A202, Room 109: Delete callout “see roof plan for chimney removal and patch.” Add callout “Remove chimney from boiler to above ceiling. Patch, repair, and paint GWB ceiling to match existing.”

2. Sheet A203, outside of Room 200: Delete callout “replace siding to match where chimney is removed.”

3. Sheet A204

a. Snow Guards callout:

i. Delete NIC

ii. Delete basis of design product and replace with “S5! System: X-Gard 1.0 guards and S-5-KHD clamps with 3 inch insert clamps.”

b. Chimney callout: Delete callout “Chimney to be removed and location patched to match existing.” Add callout “Remove chimney and retain cupola. Provide weatherproof stainless steel cap over hole in existing steel boot. Alternatively, remove existing steel boot and install weatherproof, stainless steel cap over entire cupola, sloped at 2:12 on top, to match warehouse cupola cap. Provide shop drawing of proposed cap prior to proceeding with work.”

4. Sheet A207: Delete three (3) callouts associated with chimney cupola demo and patching.

5. Sheet A210: Chimney cupola photo: Replace caption with “Existing chimney to be capped.” Delete “NIC.”

6. Sheet A700: Add Concrete Specifications:

a. Mix, place, and cure concrete and select materials in accordance with the 2015 International Building Code.

b. Submit mix design, with recorded cylinder test results, for review and approval prior to mobilizing concrete equipment to the site. Submit product data for reinforcing bars and concrete anchors.

c. Maximum slump: 4 inches, prior to adding plasticizers or water reducers on site.

d. 28-day compressive strength: 4,000 psi.

e. Use air-entrained concrete. Air content: between 5% and 8%.

f. Proportion aggregate, cement, and water to result in a dense workable mix which can be placed without excess surface water.

g. Concrete reinforcing: Comply with ASTM A615 Grade 60. Lap reinforcing steel 50 bar diameters unless noted otherwise.

h. Support reinforcing and secure in place prior to concrete placement using well-cured concrete blocks or approved plastic chairs. Do not weld reinforcing unless specifically noted.

i. Provide minimum cover at reinforcing bars as follows: Cast against earth: 3 inches, exposed to earth or weather 2 inches.

7. Sheet A700: Detail 3 is NIC.

8. Sheet M205

a. Drawing Note 3: Replace with “Remove chimney from boiler to above ceiling.”

b. Add the following Drawing Note: “Drain and remove fuel oil tank, supports, steps and appurtenances. Tank, supports, steps, and appurtenances become the contractor’s property to be disposed of in accordance with applicable regulations. Backfill where supports were removed with material matching the adjacent fill. Provide surface rock matching existing adjacent landscaping rock and feather into adjacent rock to create seamless patch. “

9. Specification 238129, part 2.15 B.2.c – Refrigerant tubing insulation and jacket requirements, field-applied jacket, outdoors, exposed to view: Add “PVC, 20 mils thick,” to list of acceptable products.