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Page 1 Project Name: Arrowhead WPF Rehab & Pecos SWTP Surge System Construction CO 4 Project No.: WA1903.401 & WA1908.401 Rev. 3/20/23 Amendment authorized by Owner name: Danny Sargent Date: 07/17/23 Original Agreement amount: $6,053,000.00 Previous Change Order total: $6,151,000.00 Last Agreement amount approved by Council: $6,053,000.00 This Change Order: $700,000.00 This Change Order + previous Change Order(s) not approved by Council total: $798,000.00 Revised Agreement total: $6,851,000.00 Council Approval Required (yes indicates approval required) Yes No Change Order(s) total over $100,000: ☒ ☐ Change Order(s) total causes Agreement to exceed $100,000: ☒ ☐ Agreement Time Agreement time prior to this Change Order (including previous change order(s): 683 Calendar Days Net change resulting from this Change Order: 0 Calendar Days Revised Agreement time (including this Change Order): 683 Calendar Days CHANGE ORDER NO. 4 DATE August 22, 2023 Change Order not valid until signed by both the City and the Contractor. Contractor’s signature indicates Agreement herewith, including any adjustments in the Agreement Price or Agreement Time. Project Name: Arrowhead WPF Rehab & Pecos SWTP Surge System Construction Project No.: WA1903.401 & WA1908.401 User Dept.: Public Works & Utilities NTP Date: 11/18/2021 TO: Achen-Gardner Construction, LLC 2195 W. Chandler Blvd., Ste. 200 Chandler AZ 85224 (CONTRACTOR) (Mailing Address) knunez@achen.com (Email Address) Contractor must make the following changes to this Agreement: (Detail scope change (Exh. A) / cost breakdown (Exh. B), if needed) The following change order represents funding to remedy unforeseen conditions discovered while rehabilitating the Arrowhead Water Production Facility (WPF) and the Pecos Surface Water Treatment Plant (SWTP). Cost increase will also capture project material cost escalations and respective extended general conditions. Including, specifically, a 30 LF deep, 24” diameter suction line metal pipe was discovered to be corroded. The suction line rehabilitation completes the entire WPF system. Final payment for the additional work will be made per contract unit rates and using contractor supplied invoicing. These additional cost items have been reviewed by city and consultant staff and found acceptable. Project Name: Arrowhead WPF Rehab & Pecos SWTP Surge System Construction CO 4 Page 2 Project No.: WA1903.401 & WA1908.401 Rev. 3/20/23 Council Approval (if applicable) Council Approval Date: Item No. THE ABOVE IS AGREED TO BY: "CITY" CITY OF CHANDLER MAYOR RECOMMENDED BY: Kimberly Moon, P.E. CIP City Engineer APPROVED AS TO FORM: City Attorney ATTEST: City Clerk C: Danny Sargent I Sandra Story "CONTRACTOR" Achen-Gardner Construction, LLC Kevin Nunez Print Name Vice President Title knunez@achen.com Signer Email Address Seal Project Name: Arrowhead WPF Rehab & Pecos SWTP Surge System Construction CO 4 Project No.: WA 1903.401 & WA 1908.401 Rev. 3/20/23 8-28-2023 Date Page3 Exhibit A Item No. 70 Extended General Conditions This bid item is added to compensate the contractor for extended general conditions. The negotiated, reduced additional general conditions are related to material availability, causing the project schedule to extend. Measurement and payment: Extended general conditions will be measured as a single complete unit of work and paid at the contract lump sum of $400,000.00. Item No. 71 Materials Cost Escalations This bid item is added to compensate the contractor for materials cost escalations. This cost represents the shared, equitable adjustment for escalations of materials suppliers and subcontractors. No markup is included (related to Contract General Conditions Section 9.5.1). Measurement and payment: Material cost escalations will be measured as a single complete unit of work and paid at the contract lump sum of $100,000.00. Item No. 72 Suction Pipe Rehab Work added previously This bid item addresses work added previously but separated out into this change order. Allowance usage amount in original contract and change order No. 3 are for all other added work or modifications to the original scope. Measurement and payment: Suction Pipe Rehab Work will be measured as a single complete unit of work and paid at the contract lump sum of $200,000.00. Exhibit B Unit Extended No. Description Quantity Price Unit Price Change Order No. 4 70 Extended General Conditions 1 $400,000.00 LS $400,000.00 71 Material Cost Escalations 1 $100,000.00 LS $100,000.00 72 Suction Pipe Rehab Work added previously 1 $200,000.00 LS $200,000.00 Original Construction Agreement: $6,053,000.00 Change Order 1 (time-extension-only): $0.00 Change Order 2 (time-extension-only): $0.00 Change Order 3: $98,000.00 Change Order 4: $700,000.00 Revised Total: $6,851,000.00