IFB_26_013_DN_Addendum_No._1_-_Drawing_108.pdf
PDF 1 MB Posted
- Attached to
- Commercial Hangar Building
- Solicitation number
- IFB 26-013-DN
- Issued by
- Miramar Beach CDP, Florida
About this file
This is Addendum No. 1 to Invitation for Bid (IFB) 26-013-DN issued by the City of Leesburg, Florida for the Commercial Hangar Building project at Leesburg International Airport. The addendum provides Drawing 108, a Grading and Drainage Plan that details the site's topographic surface, proposed grading limits, drainage infrastructure, and finished grade elevations for the four-unit commercial hangar construction project. The plan identifies existing site features including taxilanes, a dry retention pond, existing fence lines, and the proposed hangar location with a finished floor elevation of 80.8 feet. The drawing includes specific spot elevations at various survey points, contour lines indicating proposed major and minor grade elevations, swale centerlines, grading breaklines, and references to existing utility structures requiring protection during construction. The plan specifies that the contractor shall verify existing topographic surveys prior to grade disturbance, provide finished surfaces free of ponding or depressional areas, restore all disturbed areas outside project limits to equal or better than existing conditions, and utilize machine-control systems for efficient earthwork execution. All grading areas shall be restored with sod in accordance with contract specifications, with the contractor responsible for adequate grass growth and maintenance, including replacement of any sod that dies due to insufficient watering at no additional cost to the owner.
The addendum was issued on March 30, 2026, as part of the bid process for the overall project with a bid due date of April 23, 2026. The drawing includes detailed grading notes addressing contractor responsibilities for topographic verification, surface drainage, restoration of work areas, grade transitions, provision of TIN surface files for machine-control operations, intermediate as-built surveys, and notification of underground utility conflicts. The plan references additional contract specifications including FAA Specification P-152 for subgrade compaction, concrete pavement installation standards, and Item T-904 for sodding restoration. The drawing is prepared by AVCON, INC., Engineers & Planners and has been digitally signed and sealed by a professional engineer, with the note that this sheet must be printed in color for validity.
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GRAPHIC SCALE (FT)
20' 40'
NORTH
B1 GRADING AND DRAINAGE PLAN
A3 SHEET LEGEND AND KEYED NOTESA1 SHEET NOTES A4 KEY PLAN
GRADING AND
DRAINAGE PLAN
ALB
JCW
ALB
GRADING NOTES:
1. PRIOR TO DISTURBANCE OF EXISTING GRADE, THE CONTRACTOR SHALL VERIFY THE
EXISTING TOPOGRAPHIC SURVEY.
2. IT SHALL BE THE RESPONSIBILITY OF THE CONTRACTOR TO PROVIDE A FINISHED GRADE
SURFACE FREE OF LOCALIZED PONDING OR DEPRESSIONAL AREAS. THE ENGINEER MAY
ORDER SELECTIVE GRADING IN AREAS WHERE EXISTING GRADES DIFFER FROM THOSE
SHOWN IN THE TOPOGRAPHIC SURVEY, IN ORDER TO PROVIDE A CONSISTENT WELL
DRAINED SURFACE. THESE AREAS OF SELECTIVE GRADING SHALL BE PAID IN
ACCORDANCE WITH ITEM P-152, UNCLASSIFIED EXCAVATION.
3. FOR PROPOSED WORK ITEMS (ELECTRICAL, DRAINAGE, ETC.) OUTSIDE OF THE GRADING
LIMITS SHOWN, RESTORATION SHALL BE INCIDENTAL TO THE LINE ITEM ASSOCIATED WITH
THE CORRESPONDING WORK. ALL AREAS SHALL BE RESTORED TO EQUAL OR BETTER
THAN EXISTING CONDITIONS.
4. GRADING SECTIONS SHOWN ON THE PLANS ARE GENERALLY REPRESENTATIVE OF THE
PROPOSED GRADING SURFACE. THE CONTRACTOR SHALL MAKE THE NECESSARY
TRANSITIONS AS SHOWN BY THE CONTOURS, SECTIONS, AND GRADE CHARTS. ALL
TRANSITIONS AND TRANSITIONS TO EXISTING GRADE TIE-IN POINTS SHALL BE SMOOTH
AND FREE OF ABRUPT CHANGES IN GRADE.
5. THE CONTRACTOR SHALL RECEIVE A TRIANGULAR IRREGULAR NETWORK (TIN) SURFACE
TO ASSIST WITH GRADING OPERATIONS. THE CAD FILE CONTAINING THE TIN SURFACE
SHALL CONTAIN SPOT ELEVATIONS, BREAKLINES, AND SURFACE GRADIENTS. IT IS THE
CONTRACTOR'S RESPONSIBILITY TO PROVIDE A FINISH SURFACE IN ACCORDANCE WITH
THE PLANS AND SPECIFICATIONS. THE CONTRACTOR SHALL BE EQUIPPED WITH THE
ABILITY TO UTILIZE MACHINE-CONTROL SYSTEMS TO EFFICIENTLY PERFORM
EARTHWORK IN ACCORDANCE WITH THE PLANS AND SPECIFICATIONS. THE CONTRACTOR
SHALL NOTIFY THE ENGINEER OF RECORD PRIOR TO CONSTRUCTION IF THERE IS ANY
UNDERGROUND UTILITY CONFLICT THAT INTERFERES WITH THE PROPOSED GRADING
PLANS.
6. THE CONTRACTOR SHALL BE REQUIRED TO PROVIDE INTERMEDIATE AS-BUILT SURVEYS
OF THE INDICATED PLAN PAVEMENT AREAS AFTER THE SUBGRADE HAS BEEN
COMPACTED AND ACCEPTED IN ACCORDANCE WITH FAA SPECIFICATION P-152, AND
AFTER THE FINAL CONCRETE PAVEMENT INSTALLATION IN ADDITION TO THE REQUIRED
PROJECT DOCUMENTATION AND DELIVERABLES.
7. ALL AREAS OUTSIDE OF THE PROPOSED GRADING LIMITS THAT ARE IMPACTED,
DISTURBED, EXCAVATED, OR FILLED SHALL BE RESTORED BY THE CONTRACTOR AT NO
ADDITIONAL COST TO THE OWNER.
RESTORATION NOTES
3. ALL AREAS TO BE EXCAVATED SHALL BE STRIPPED OF VEGETATION AND TOPSOIL IN
ACCORDANCE WITH SECTION P-152-2.2 OF THE CONTRACT SPECIFICATIONS. STRIPPING
SHALL BE CONSIDERED A NECESSARY AND INCIDENTAL ITEM OF THE WORK INVOLVED
AND SHALL NOT BE MEASURED SEPARATELY FOR PAYMENT.
4. AREAS OUTSIDE OF THE PROJECT LIMITS THAT ARE DISTURBED BY THE CONTRACTORS
WORK OPERATIONS SHALL BE REPAIRED/REGRADED/RESTORED BY THE CONTRACTOR AT
NO ADDITIONAL COST TO THE OWNER. ALL DISTURBED AREAS OUTSIDE OF THE PROJECT
GRADING LIMITS SHALL BE RESTORED EQUAL TO OR GREATER THAN THE EXISTING
CONDITION REGARDLESS OF MATERIAL. ALL ASSOCIATED COSTS SHALL BE BORNE BY THE
CONTRACTOR.
5. ALL GRADING AREAS SHALL BE RESTORED WITH SOD, IN ACCORDANCE WITH ITEM T-904.
ALL AREAS OF SODDING SHALL BE SMOOTH AND FREE OF RUTTING AT THE COMPLETION
OF THE PROJECT.
6. IT SHALL BE THE CONTRACTORS RESPONSIBILITY TO ENSURE ADEQUATE GROWTH OF
GRASS FOR ALL AREAS RESTORED WITH SOD. CONTRACTOR SHALL WATER AND MAINTAIN
THE RESTORATION AREA.
7. SOD THAT DIES DUE TO INSUFFICIENT WATERING SHALL BE REMOVED AND REPLACED
WITH NEW SOD AT NO ADDITIONAL COST TO THE OWNER.
PROPOSED MAJOR CONTOURSX.XX'
SWALE CENTERLINE, (TYP.)
GRADING BREAKLINE, (TYP.)
PROPOSED MINOR
CONTOURSX.XX'
KEYED NOTES:
1. EXISTING TOPOGRAPHIC SURFACE CONTOURS. A COPY OF THE EXISTING TOPOGRAPHIC
SURFACE SHALL BE PROVIDED TO THE CONTRACTOR FOR REFERENCE DURING
CONSTRUCTION OPERATIONS, (TYP.)
2. PROPOSED GRADING LIMITS, TIE INTO EXISTING GRADE, (TYP.)
3. EXISTING UTILITY STRUCTURE TO BE PROTECTED.
4. CONCRETE TO ASPHALT KEYING DETAIL, A1/109.
5. YELLOW JACKET GEOSOLUTIONS INLET PROTECTION OR APPROVED EQUIVALENT, ITEM
C-102 STORM DRAIN INLET PROTECTION.
6. CONTRACTOR SHALL PROTECT THE EXISTING DRAINAGE INFRASTRUCTURE IN PLACE
DURING GRADING OPERATIONS. FOR EXISTING DRAINAGE STRUCTURE ELEVATION,
INVERTS AND SLOPES PLEASE REFER TO SHEET 105.
ATTENTION:
THIS DOCUMENT CONTAINS PRIVILEGED AND PROPRIETARY
INFORMATION, ALL OF WHICH IS EXPRESSLY PROVIDED BY AVCON, INC.,
FOR USE BY THE INTENDED RECIPIENT, AND FOR A SPECIFIC PURPOSE.
WITHOUT THE EXPRESS WRITTEN CONSENT OF AVCON, INC. ANY
DISTRIBUTION, REPRODUCTION, OR OTHER USE OF THIS DOCUMENT, IN
WHOLE OR IN PART, IS STRICTLY PROHIBITED
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LEESBURG INTERNATIONAL
AIRPORT
LEESBURG, FLORIDA
COMMERCIAL HANGAR
BUILDING
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CADD:
CITY IFB NO. 26-011-HG
DRAWING
DATE:
APPROVED BY:
CHECKED BY:
DRAWN BY:
DESIGNED BY:
MARCH 2026
DJN
SCALE (US SVY FT): GRAPHIC
NO. DATE BY DESCRIPTION
REVISIONS:
AVCON, INC.
ENGINEERS & PLANNERS
5555 E. MICHIGAN ST., SUITE 200 - ORLANDO, FL 32822-2779
OFFICE: (407) 599-1122 - FAX: (407) 599-1133
CORPORATE CERTIFICATE OF AUTHORIZATION NUMBER: 5057
www.avconinc.com
Printed copies of this document are not considered signed and sealed and the signature must be verified on any electronic copies.
This item has been digitally signed and sealed by:
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AVCON PROJECT NO. 2025.236.02
AIRPORT BLVD
AIRPORT BLVD
EXISTING TAXILANE T-1
EXISTIN
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TAXILAN
E T-6
EXISTING TURF AREA
EXISTING
DRY
RETENTION
POND AREA
EXISTING FENCE LINE, (TYP.)
EXISTIN
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EXISTING HANGAR
EXISTIN
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PROPOSED 4-UNIT COMMERCIAL HANGAR
FFE: 80.8'
5|6 5|6
5|65|65|6
5|6
5|6
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B1
N: 1634478.2941 E: 397720.6462
ELEV: 77.75'
N: 1634406.2315 E: 397694.7032
ELEV: 76.50'
N: 1634500.7671 E: 397697.3798
ELEV: 80.60'
N: 1634436.4374 E: 397669.7811
ELEV: 80.60'
N: 1634424.6238 E:397659.2722
ELEV: 77.95'
N:1634519.2479 E: 397438.7132
ELEV: 79.95'
N: 1634533.0328 E: 397444.6272
ELEV: 80.70'
N: 1634535.0042 E: 397440.0322
ELEV: 80.60'
N: 1634478.2941 E: 397720.6462
ELEV: 80.60'
N: 1634438.4087 E: 397665.1862
ELEV: 80.70'
N: 1634502.6079 E: 397690.5526
ELEV: 80.67'
N: 1634593.4199 E: 397481.4158
ELEV: 80.78'
26-013-DN
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1 3-30-2026 DJN BID ADDENDUM #1
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