Attachment_16_HWD_Addendum_Narrative_01_2025_09_19_2_0005.pdf
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- Attached to
- GAOA HOT WELL DUNES CAMPGRND IMPRVMNTS
- Solicitation number
- 140L0625B0012
About this file
This document is an Addendum (No. 01) for the Hot Well Dunes Recreation Area Improvements project by GLHN Architects & Engineers, Inc., dated September 19, 2025. The addendum includes modifications to contract forms, specifications, and drawings, with key changes involving domestic water piping, photovoltaic collectors, water supply wells, and fencing. Significant technical updates include revising earthwork calculations, adding concrete sidewalk extensions, modifying solar shade canopy details, updating electrical system components such as replacing charge controllers with a pump controller, changing from an automatic transfer switch to a manual transfer switch, and adjusting solar panel and inverter configurations.
The addendum specifies detailed modifications across multiple technical disciplines, including civil, mechanical, electrical, and landscape elements. Notable changes involve solar panel installation specifications (to be installed at 28.1 degrees from horizontal), addition of underground conduits, updates to pump schedules and diagrams, revisions to electrical system layouts, and refinements to fencing details. The attached documents include revised estimated quantities, updated specification sections, and modified drawings dated between 9/3/2025 and 9/19/2025, indicating a comprehensive review and update of the project's technical documentation.
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GLHN ARCHITECTS & ENGINEERS, INC
2939 E Broadway Blvd. | Tucson, AZ 85716 | 520.881.4546
3636 N Central Ave, Suite 160 | Phoenix, AZ 85012 | 602.368.9393 | GLHN.com
Hot Well Dunes Rec Area Improvements
Addendum # 01 Sept. 19, 2025 Page 1 of 2
ADDENDUM | No.: 01
TO: J. Carlos Joya, PE
One N. Central Ave, Suite 800
Phoenix, AZ 85004
DATE: September 19, 2025
REFERENCE: Project Name: Hot Well Dunes Recreation Area Improvements
GLHN Job No.: 20049.06
FROM: GLHN Architects & Engineers, Inc.
2939 E Broadway Blvd.
Tucson, AZ 85716
This Addendum becomes a part of the Contract Documents and modifies the original bidding documents as noted below.
CHANGES TO CONTRACT FORMS
1. Estimated Quantities: changes to estimated quantities
CHANGES TO SPECIFICATIONS
1. REPLACE Section 221116, Domestic Water Piping: HDPE pipe and fittings added, nonapplicable sections deleted.
2. REPLACE Section 263100, Photovoltaic Collectors: updated to reflect revised selection of equipment.
3. REPLACE Section 332100, Water Supply Wells: revised well pump basis of design and deleted nonapplicable sections.
4. REPLACE Section 322100, Fencing: revised barbed wire and split rail fencing materials.
CHANGES TO DRAWINGS
1. GI002 (dated 9/3/2025): Revised earthwork calculations to clarify cut and fill volumes.
Added Site Furnishings General Notes regarding solar shade structures
2. CV200 (dated 9/3/2025): Corrected scale bar
3. CS100 (dated 9/19/2025): Added concrete sidewalk extensions at information kiosks and dimensions to site furnishings keynote 7
4. CS200 (dated 9/3/2025): Revised callout for solar shade canopy over pump house, adding
2 panels and maintaining clearance over well on west side; added underground conduit for power (new keynote 31); added air release valve to pond water line; revised keynote
5. CS501 (dated 9/3/2025): Details 5 & 6, panel size removed and note added “SOLAR
PANELS TO BE INSTALLED AT 28.1 DEGREES FROM HORIZONTAL OR AS APPROVED BY THE
GOVERNMENT.” Minimum canopy dimensions (12’x12’) added to Detail 5. Solar racking called out and rain water gutter added on Detail 6. Both details refer to Site Furnishings
Notes, sheet GI002
6. CS502 (dated 9/3/2025): Detail 3, Joint Trench deleted
GLHN ARCHITECTS & ENGINEERS, INC
2939 E Broadway Blvd. | Tucson, AZ 85716 | 520.881.4546
3636 N Central Ave, Suite 160 | Phoenix, AZ 85012 | 602.368.9393 | GLHN.com
Hot Well Dunes Rec Area Improvements
Addendum # 01 Sept. 19, 2025 Page 2 of 2
7. CS504 (dated 9/19/2025): Detail 2, Joint Trench added, w/conduits for power; Detail
1canopy minimum dimensions and clearances added and referenced to Site Furnishings
Notes, sheet GI002. Panel size removed and note added “SOLAR PANELS TO BE INSTALLED
AT 28.1 DEGREES FROM HORIZONTAL OR AS APPROVED BY THE GOVERNMENT”
8. P001 (dated 9/3/2025): Updated Pump Schedule.
9. P501 (dated 9/3/2025): Updated detail 1, Well Pump Diagram.
10. ES102 (dated 9/19/2025): Added two 1” conduits running between canopy kiosk and pump house. Now showing location of more equipment in pump house. Inverter, and combiner.
11. E-601(dated 9/19/2025): Changed ATS to MTS. Automatic transfer switch is not necessary.
Updated voltages of panel boards in worksheet and adjusted load. Added note re 10% safety factor.
12. E-602 (dated 9/19/2025): Charge controllers were removed, with one replaced by a pump controller. Microinverters were replaced with a 6.5 kW inverter located in the pump house with batteries. The pump selection has been updated to an AC pump, and the DC disconnect has been changed to an AC disconnect; a third disconnect was added to provide local disconnect to the batteries. Two solar panels added to Pump array.
13. E-701 (dated 9/19/2025): Added a grounding and bonding detail to clarify the connection between support structures and the grounding system.
14. LP-501 (dated 9/3/2025): Revised detail 1 to include the missing brace post details A & B.
Revised detail 2 to clarify the fencing nomenclature for brace panels and posts vs tension post. Replaced detail 3 with a new Split Rail Fencing detail as the previous version shows incorrect materials.
LIST OF DOCUMENTS ATTACHED
1. Revised Estimated Quantities
2. Revised Specifications Sections (listed above)
3. Revised drawings (as dated and listed above)
END OF ADDENDUM
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