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Home My WebLink AboutCONTRACT MODIFICATION NUMBER 1 TO CONTRACT WITH GRIFFIN CONTRACTING, INC. FOR ARFF PAVEMENT REHABILITATION CONTRACT MODIFICATION NUMBER 1 OWNER: Augusta Regional Airport CONTRACTOR: Griffin Contracting,Inc. 1501 Aviation Way 122 Pipemakers Circle,Suite 207 Augusta,GA 30906 Savannah,GA 31418 PROJECT: ARFF Pavement Rehabilitation CONTRACT DATE: May 26,2016 PROJECT NUMBER: AIP No.3-13-0011-038-2015 NO WORK COVERED BY THIS CHANGE ORDER MAY PROCEED UNTIL CONTRACTOR IS IN RECEIPT OF A COPY OF FULLY EXECUTED ORDER BY THE CONTRACTOR, THE OWNER AND THE ENGINEER. IF CONTRACTOR IS IN AGREEMENT WITH THIS CHANGE,CONTRACTOR SHOULD EXECUTE ALL COPIES AND RETURN ALL COPIES TO THE CONSTRUCTION PROJECT MANAGER WITHIN SEVEN (7) CALENDAR DAYS. THIS CHANGE WILL INCREASE OR DECREASE THE CONTRACT AMOUNT AND TIME TO COMPLETE BY THE AMOUNT SHOWN BELOW. ALL OTHER TERMS OF THE CONTRACT, INCLUDING THE GENERAL, SUPPLEMENTARY AND OTHER CONDITIONS OF THE CONTRACT SHALL APPLY TO THIS CHANGE ORDER UNLESS EXPRESSLY MODIFIED BY THIS CHANGE. DESCRIPTION OF CHANGE: The primary change of Contract Modification Number 1 is to remove storm sewer partially installed and to add new storm sewer of a different size; to diamond grind a portion of an existing concrete duct bank to meet design grades; and to demolish existing brick foundations. These modifications are the result of unknown site conditions that have been discovered during construction. ORIGINAL TOTAL CONTRACT PRICE $544,432.00 APPROVED COST ADDITIONS(DELETIONS)TO DATE $0.00 AMOUNT OF THIS CHANGE ORDER- $8,455.20 REVISED TOTAL CONTRACT PRICE $552,887.20 PERCENTAGE FOR THIS CHANGE ORDER OF ORIGINAL CONTRACT PRICE 1.65% TOTAL CHANGE ORDER PERCENTAGE OF ORIGINAL CONTRACT PRICE 1.55% ORIGINAL TOTAL CONTRACT CALENDAR DAYS b0 CALENDAR DAY ADDITIONS(DELETIONS)PREVIOUS CHANGE ORDERS 0 CALENDAR DAY ADDITIONS(DELETIONS)THIS CHANGE ORDER 8 REVISED TOTAL CONTRACT CALENDAR DAYS 58 CONTRACTOR ACKNOWLEDGES, BY ITS EXECUTION AND ACCEPTANCE OF THIS CHANGE ORDER, THAT THE ADJUSTMENTS IN CONTRACT PRICE AND TIME SHOWN HEREON CONSTITUTES FULL AND COMPLETE COMPENSATION AND SATISFACTION FOR ALL COSTS AND MODIFICATIONS OF PERFORMANCE TIME INCURRED BY THE CONTRACTOR AS A RESULT OF THIS CHANGE ORDER, NO OTHER CLAIM FOR INCREASED COST OF PERFORMANCE OR MODIFICATIONS OF TIME WILL BE GRANTED BY THE OWNER FOR THIS WORK COVERED BY THIS CHANGE.THE CONTRACTOR HEREBY WAIVES AND RELEASE ANY FURTHER CLAIMS FOR COST OR TIME AGAINST THE OWNER ARISING FROM OR RELATING TO THE MATTERS OF WORK SET FORTH OR CONTEMPLATED BY THIS CHANGE ORDER. CONTRACZ 'S ACCEPCE:Griffi Contracting //4/44' l�A Printed Name: y Title s��r �tGC A/EMMEfjrgEl FORAPPROVAL:Mead&Hunt,Inc. ''L„. _. 4.421/ /G Sign re Date Christopher J.Birkmeyer,P.E. Project Manager Printed Name: Title OW R MME• a: r J OR APPROVAL:Augusta Regional Airport r',, is - IS - 1 to Signatur& Date uear iC., a,keloS�1(-- �tict. r nnQy) Printed Name: Title AUGUSTA RICHMOND COUNTY Hardie Davis, Jr., Mayor 460 171-4-/7 h w... ATTEST: voesoomett al 4, el CP # 4 p0 i ena i it*, a V1/4 " M 06 ��ttr668i�A��" krik Approved-as to-Form:---,._. . di Andrew Mackenzie, sq. 1 CONTRACT MODIFICATION NUMBER 1 OWNER: Augusta Regional Airport CONTRACTOR: Griffin Contracting, Inc. 1501 Aviation Way 122 Pipemakers Circle, Suite 207 Augusta,GA 30906 Savannah,GA 31418 PROJECT: ARFF Pavement Rehabilitation CONTRACT DATE: May 26,2016 PROJECT NUMBER: AIP No.3-13-0011-038-2015 DESCRIPTION OF CHANGE: The primary change of Contract Modification Number 1 is to remove storm sewer partially installed and to add new storm sewer of a different size; to diamond grind a portion of an existing concrete duct bank to meet design grades; and to demolish existing brick foundations. These modifications are the result of unknown site conditions that have been discovered during construction. NEW ITEMS 1. Remove Existing Brick Foundations. Contractor to remove existing brick foundations encountered within the proposed pavement reconstruction limits to a depth of two feet below proposed subgrade. This work shall be paid for on a lump sum basis that includes all costs associated with demolition of the existing structures encountered, backfilling of excavated area, and hauling of materials off site to a landfill. Disposal of material shall be as stated in section 105-2.11 of the Technical Specifications. Payment shall be for full compensation of labor,equipment,permits, and disposal fees. This revision requires that a new pay item, "Item X-105.3 Remove Existing Brick Foundation" be created. Two (2)working days are added to the project for the time required to excavate and backfill the material encountered. ADD/(DELETE): X-105.3: 1 Each at$1,295 COST ADDITION/(DELETION): $1,295.00 DAYS ADDITION/(DELETION): 2 JUSTIFICATION: During excavation for the proposed pavement section,the brick foundation from a previous ARFF building was encountered. All foundations encountered within two feet of subgrade are required to be removed based on Section 152-2.2.d of the project specifications. Since it was not evident to the Contractor during the bidding of the project that this foundation existed,additional compensation to meet this requirement is justified. Removal of the foundations encountered will protect the new pavement section and allow it to function as designed. 2. Diamond Grind Existing Duct Bank. Contractor to diamond grind the existing concrete duct bank encountered below grade during construction. The duct bank shall be lowered to meet the line and grade shown on the Construction Plans. Diamond grinding shall be accomplished by sawing with saw blades impregnated with industrial diamond abrasive.The saw blades shall be assembled in a cutting head mounted on a machine designed specifically for diamond grinding that will produce the required texture and smoothness level without damage to the pavement.The saw blades shall be 1/8-inch wide and there shall be a minimum of 55 to 60 blades per 12 inches of cutting head width;the actual number of blades will be determined by the Contractor and depend on the hardness of the aggregate. Each machine shall be capable of cutting a path at least 3 feet wide. Equipment that causes ravels,aggregate fractures,spalls or disturbance to the pavement will not be permitted.The depth of grinding shall be sufficient to meet the line and grades shown on the Construction Plans. Grinding will be tapered in all directions to provide smooth transitions to areas not requiring grinding. This work shall be paid for on a lump sum basis that includes all costs associated with diamond grinding of the existing concrete duct bank. Payment shall be for full compensation of labor, equipment, and mobilization. This revision requires that a new pay item, "Item P-101.3 Diamond Grind Existing Duct Bank" be created. One(1)working day is added to the project for the time required to complete this task. ADD/(DELETE): P-101.3: 1 Each at$3,290 COST ADDITION/(DELETION): $3,290 DAYS ADDITION/(DELETION): 1 JUSTIFICATION: During excavation for the proposed pavement section a concrete encased duct bank was encountered immediately under the surface of the asphalt pavement. This top of duct bank is at approximately the same elevation as the proposed grade. To avoid damage to the existing cables within the duct bank and to minimize additional cost to the project it has been determined that diamond grindinging the top of the duct bank to meet the proposed grade and to provide a ridable surface is the most viable solution. Since the majority of the cost associated with this task is the mobilization of the equipment to the project site it was decided to allow for this item to be paid on a lump sum basis. 3.Revise Storm Drainage System. The storm pipe run between Inlet-F3 and Inlet-G1 will be constructed with a 15- inch reinforced concrete pipe (RCP) instead of an 18-inch RCP in order to get under an existing concrete encased duct bank. . Inlet-F3 will be modified to allow the 15-inch storm sewer to come into the structure at a lower elevation. Contractor to remove 24-linear feet 18-inch reinforced concrete pipe (RCP) of storm sewer partially installed and replace with a 15-inch RCP. This work will require the addition of"Item X-105.2—Restock Concrete Sewer Pipe, 18- inch"; "Item D-701.4 — Concrete Sewer Pipe, 15-inch, Class V"; and "Item D-751.4— Modify Storm Inlet". Five (5) working days have been added to allow for acquisition of 15-inch RCP and completion of this task. Item X-105.2 shall be measured and paid as stated in sections 105-3.1 and 105-4.1 of the Technical Specifications. Item D-701.4 shall be measured and paid as stated in sections 701-4.1 and 701-5.1 of the Technical Specifications. Item D-751.4 shall be measured and paid as stated in sections 751-4.1 and 751-5.1 of the Technical Specifications. ADD/(DELETE): X-105.2: 24 Linear Feet at$19.80 D-701.4: 43 Linear Feet at$50.00 D-751.4: 1 Each at$1,245.00 COST ADDITION/(DELETION): $3,936.20 DAYS ADDITION/(DELETION): 5 JUSTIFICATION: During installation of the storm sewer a conflict with the elevation of the bottom of an existing concrete encased duct back and the grade of the proposed 18-inch storm drain was identified. In order to maintain the intent of the project design it was determined that by lowering the invert elevation of the downstream inlet and changing the pipe size from 18-inches to 15-inches that it would be possible to get the proposed pipe under the existing duct bank without modification of the duct bank. Alternatives to this solution were analyzed, but this solution was the most cost effective giving the time associated with ordering new materials. Cost Analysis:All new unit prices have been evaluated by Mead&Hunt and are in line with industry standards based on projects of similar size and scope and the work required. AUGUSTA REGIONAL AIRPORT-ARFF PAVEMENT REHABILITATION-QUANTITY TRACKING Original Original Revised Revised Item# Description Unit Contract Unit Cost Contract Contract Col Quantity Cost. Quantity Contract Cost P-100.1 Mobilization,Cleanup,and Demobilization LS 1 $63,063.00 $ 63,063.00 1 $ 63,063.00 SP-10 Airfield Safety and Traffic Control LS 1 $94,136.00 $ 94,136.00 1 $ 94,136.00 P-101.1 Asphalt Concrete Pavement Removal,Full Depth SY 2693 $ 12.00 $ 32,316.00 2693 $ 32,316.00 P-101.2 Cold Milling SY 600 $ 8.00 $ 4,800.00 600 $ 4,800.00 P-101.3 Diamond Grind Existing Duct Bank EA 0 $ 3,290.00 $ - 1 $ 3,290.00 1 X-105.1 Remove Storm Sewer Catch Basin Structure EA 1 $ 2,785.00 $ 2,785.00 1 $ 2,785.00 X-105.2 Restock Concrete Sewer Pipe,18-Inch LF 0 $ 19.80 $ - 24 $ 475.20 24 X-105.3 Remove Existing Brick Foundation LS 0 $ 1,295.00 $ - 1 $ 1,295.00 1 X-106.1 Recycled Base CY 140 $ 17.85 $ 2,499.00 140 $ 2,499.00 X-109.1 Fuel Containment Piping EA 1 $ 4,254.00 $ 4,254.00 1 $ 4,254.00 P-152.1 Unclassified Excavation CY 777 $ 27.00 $ 20,979.00 777 $ 20,979.00 P-152.2 Subgrade Preparation SY 2693 $ 6.00 $ 16,158.00 2693 $ 16,158.00 P-156.1 Temporary Seeding&Mulching LS 1 $ 770.00 $ 770.00 1 $ 770.00 P-156.2 Inlet Sediment Trap-Silt Sack EA 5 $ 310.00 $ 1,550.00 5 $ 1,550.00 P-156.3 Crushed Stone Construction Outlet EA 1 $ 4,236.00 $ 4,236.00 1 $ 4,236.00 P-156.4 Erosion Control Mobilization EA 1 $10,500.00 $ 10,500.00 1 $ 10,500.00 P-156.5 Emergency Erosion Control Mobilization EA 1 $ 2,800.00 $ 2,800.00 1 $ 2,800.00 P-209.1 Crushed Aggregate Base Course(12"Depth) CY 1123 $ 69.00 $ 77,487.00 1123 $ 77,487.00 X-405.1 Asphalt Concrete Surface Course TON 872 $ 99.75 $ 86,982.00 872 $ 86,982.00 P-620.1 Temporary Pavement Marking SF 310 $ 2.00 $ 620.00 310 $ 620.00 P-620.2 Permanent Pavement Markings SF 800 $ 3.00 $ 2,400.00 800 $ 2,400.00 D-701.1 Concrete Sewer Pipe,18-Inch,Class V LF 96 $ 51.00 $ 4,896.00 96 $ 4,896.00 D-701.2 Concrete Sewer Pipe,24-Inch,Class III LF 264 $ 54.00 $ 14,256.00 264 $ 14,256.00 D-701.3 Trench Drain,8-inch,Aircraft Rated LF 135 $ 275.00 $ 37,125.00 135 $ 37,125.00 D-701.4 Concrete Sewer Pipe,15-Inch,Class V LF 0 $ 50.00 $ - 43 $ 2,150.00 43 D-751.1 Catch Basin,Type A EA 4 $ 6,390.00 $ 25,560.00 4 $ 25,560.00 D-751.2 Connect Storm Sewer Pipe to Storm Structure EA 1 $ 8,110.00 $ 8,110.00 1 $ 8,110.00 D-751.3 Trench Drain Drainage Structure EA 1 $ 6,295.00 $ 6,295.00 1 $ 6,295.00 D-751.4 Modify Storm Inlet EA $ 1,245.00 $ - 1 $ 1,245.00 1 D-754.1 Concrete Curbing LF 150 $ 84.00 $ 12,600.00 150 $ 12,600.00 T-901.1 Seeding ACRE 1 $ 2,530.00 $ 2,530.00 1 $ 2,530.00 T-905.1 Topsoiling(Obtained on site or removed from stockpile) CY 315 $ 15.00 $ 4,725.00 315 $ 4,725.00 $544,432.00 "` $ 552,887.20 $8,455.20 Increase to Bid 1.55% Cum.CO Total $ 8,455.20 Total Project$ $552,887.20 Total Project% 101.6%