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Home My WebLink About8525-011 - Formal Amendment 1 Executed DocuSign Transmittal Coversheet File Name Purchasing Contact Docusign Envelope ID: AAB8A0DB-7DC6-4BB7-87A1-314E96CB3CFF Crystal Westbrook 8525-011 CELL 6 CONSTRUCTION QA SERVICE-AMENDMENT 1 8525-011 PSA – Amendment #1 Page 1 of 2 FIRST AMENDMENT TO CONTRACT BY AND BETWEEN THE CITY OF DENTON, TEXAS AND BIGGS & MATHEWS ENVIRONMENTAL, INC. PSA 8525-011 THE STATE OF TEXAS § COUNTY OF DENTON § THIS FIRST AMENDMENT TO CONTRACT 8525-011 (“Amendment”) by and between the City of Denton, Texas (“City”) and Biggs & Mathews Environmental, Inc. (“Engineer”); to that certain contract executed on November 18, 2025, in the original not- to-exceed amount of $245,000 (the “Agreement”); for services related to the Cell 6 Construction Quality Assurance Service. WHEREAS, the City deems it necessary to further expand the services provided by Engineer to the City pursuant to the terms of the Agreement, and to provide an additional not-to-exceed amount $31,940 with this Amendment for an aggregate not-to-exceed amount of $276,940; and FURTHERMORE, the City deems it necessary to further expand the goods/services provided by Engineer to the City; NOW THEREFORE, the City and Engineer (hereafter collectively referred to as the “Parties”), in consideration of their mutual promises and covenants, as well as for other good and valuable considerations, do hereby AGREE to the following Amendment, which amends the following terms and conditions of the said Agreement, to wit: 1. The additional services described in Exhibit “A” of this Amendment, attached hereto and incorporated herein for all purposes, for professional services related to the Cell 6 Construction Quality Assurance Service Project, are hereby authorized to be performed by Engineer. For and in consideration of the additional services to be performed by Engineer, the City agrees to pay, based on the cost estimate detail attached as Exhibit “A” purposes, a total fee, including reimbursement for non- labor expenses an amount not to exceed $31,940. 2. This Amendment modifies the Agreement amount to provide an additional $31,940 for the additional services with a revised aggregate not to exceed total of $276,940. The Parties hereto agree, that except as specifically provided for by this Amendment, that all of the terms, covenants, conditions, agreements, rights, responsibilities, and obligations of the Parties, set forth in the Agreement remain in full force and effect. Docusign Envelope ID: AAB8A0DB-7DC6-4BB7-87A1-314E96CB3CFF 8525-011 PSA – Amendment #1 Page 2 of 2 IN WITNESS WHEREOF, the City and the Engineer, have each executed this Amendment electronically, by and through their respective duly authorized representatives and officers on this date _________________________. “City” CITY OF DENTON, TEXAS A Texas Municipal Corporation By: _________________________________ AUTHORIZED SIGNOR, TITLE “Engineer” BIGGS & MATHEWS ENVIRONMENTAL, INC. By: _________________________________ AUTHORIZED SIGNOR, TITLE THIS AGREEMENT HAS BEEN BOTH REVIEWED AND APPROVED as to financial and operational obligations and business terms. _______________ ________________ SIGNATURE PRINTED NAME __________________________________ TITLE __________________________________ DEPARTMENT APPROVED AS TO FORM: MACK REINWAND, CITY ATTORNEY BY: _______________________________ Docusign Envelope ID: AAB8A0DB-7DC6-4BB7-87A1-314E96CB3CFF Secretary Solid Waste & Recycling Director Brenda Haney Senior Buyer 1/22/2026 AMENDED SCOPE OF SERVICES City of Denton Landfill Cell 6 Construction Construction Quality Assurance Services City of Denton December 30, 2025 Prepared by BIGGS & MATHEWS ENVIRONMENTAL 1700 Robert Road, Suite 100  Mansfield, Texas 76063  817-563-1144 TEXAS BOARD OF PROFESSIONAL ENGINEERS FIRM REGISTRATION NO. F-256 TEXAS BOARD OF PROFESSIONAL GEOSCIENTISTS FIRM REGISTRATION NO. 50222 Docusign Envelope ID: AAB8A0DB-7DC6-4BB7-87A1-314E96CB3CFF EXHIBIT A Biggs & Mathews Environmental 1 City of Denton O:\City Of Denton\Denton Lf\Solid Waste\Cell 6\Amended Cqa Proposal.Docx December 30, 2025 Introduction Biggs and Mathews Environmental (BME) is pleased to submit this amended scope of services to provide construction quality assurance (CQA) services for construction of the Cell 6 composite liner and leachate collection system. The following items summarize our understanding of the project: · Cell 6 covers approximately 16.7 acres · Cell 1590 covers approximately 13.8 acres · Construction will begin during the first quarter of 2026 · A general contractor will excavate to design subgrade and construct the soil liner, a geosynthetics contractor will install composite liner and leachate collection system, and the general contractor will install the protective cover over the liner and will construct the leachate collection system trench and sump · The composite liner and leachate collection system will consist of 2 feet of soil liner overlain by 60-mil HDPE geomembrane, drainage geocomposite and 2 feet of protective cover soil The following table summarizes the estimated construction quantities and construction schedule for the Cell 6 portion of the project. Description Estimated Volume or Area Estimated Production Rate Approximate Number of Working Days Number of CQA Monitors On Site Compacted Soil Liner 54,000 cy 3,500 cy/day 16 1 Geomembrane 728,850 sf 50,000 sf/day 15 2 Geocomposite 728,850 sf 80,000 sf/day 10 1 Leachate Collection Trench and Sump 1,100 lf 600 lf/day 2 1 Protective Cover 54,000 cy 4,000 cy/day 14 1 Total Estimated Construction Days 57 Docusign Envelope ID: AAB8A0DB-7DC6-4BB7-87A1-314E96CB3CFF Biggs & Mathews Environmental 2 City of Denton O:\City Of Denton\Denton Lf\Solid Waste\Cell 6\Amended Cqa Proposal.Docx December 30, 2025 The following table summarizes the estimated construction quantities and construction schedule for the Cell 1590 portion of the project. Description Estimated Volume or Area Estimated Production Rate Approximate Number of Working Days Number of CQA Monitors On Site Compacted Soil Liner 42,220 cy 2,600 cy/day 17 1 Geomembrane 600,200 sf 50,000 sf/day 12 2 Geocomposite 1,140,000 sf 80,000 sf/day 14 1 Protective Cover 42,300 cy 4,000 cy/day 11 1 Total Estimated Construction Days 54 Scope of Services BME will provide full-time on-site CQA monitors during the construction of the liner and leachate collection systems as required by the Soil and Liner Quality Control Plan. The CQA monitors will: · Observe earthwork and perform field density tests on compacted earthfill · Observe soil liner construction and perform field density tests and collect samples for determining classification properties and permeability · Observe geomembrane deployment, welding, testing and repairs and collect samples for laboratory testing · Observe geocomposite deployment, seaming and repairs · Observe leachate collection trench installation · Observe protective cover placement BME will also provide all laboratory testing services for the project. The laboratory testing will include: · Conformance testing of the geomembrane material · Preconstruction testing of the soil liner material · Preconstruction testing of the leachate aggregate · Construction testing of the soil liner material · Construction testing of the geomembrane seams Docusign Envelope ID: AAB8A0DB-7DC6-4BB7-87A1-314E96CB3CFF Biggs & Mathews Environmental 3 City of Denton O:\City Of Denton\Denton Lf\Solid Waste\Cell 6\Amended Cqa Proposal.Docx December 30, 2025 Project Budget The proposed budget for the scope of services described is summarized below. Services that are beyond those described in this proposal and are authorized by the City will be billed at the rates provided Attachment 1. Task Original Budget Additional Budget Revised Budget 1. Project Management 29,000.00$ 3,000.00$ 32,000.00$ 2. Field Testing and Observation 180,000.00$ 17,780.00$ 197,780.00$ 3. Laboratory Testing 36,000.00$ 11,160.00$ 47,160.00$ Total 245,000.00$ 31,940.00$ 276,940.00$ Docusign Envelope ID: AAB8A0DB-7DC6-4BB7-87A1-314E96CB3CFF ATTACHMENT 1 Docusign Envelope ID: AAB8A0DB-7DC6-4BB7-87A1-314E96CB3CFF BIGGS & MATHEWS ENVIRONMENTAL, INC TBPELS No. F-256 AND No. 10194895 TBPG No. 50222 Biggs & Mathews Environmental, Inc.1 of 2 Schedule of Charges L:\Admin\Billing Rates\Rates 2025.docx SCHEDULE OF CHARGES 2025 PERSONNEL CHARGES Category Billing Rate Range $ Per Hour Administrative/Project Assistant 60 – 80 Sr. Administrative/Project Assistant 80 – 100 Designer/Technician/Field Services 65 – 85 Sr. Designer/Sr. Technician/Sr. Field Services Technician 80 – 110 Engineer/Scientist 80 – 125 Project Engineer/Scientist 95 – 150 Senior Project Engineer/Scientist 125 – 175 Principal Engineer/Scientist 175 – 250 Survey – One (1) Person Field Crew 115 – 140 Survey – Two (2) Person Field Crew 155 – 180 Depositions and expert witness testimony, including preparation time, will be billed at 1.5 times the above hourly rates. DRAFTDRAFT Docusign Envelope ID: AAB8A0DB-7DC6-4BB7-87A1-314E96CB3CFF Biggs & Mathews Environmental, Inc.2 of 2 Schedule of Charges L:\Admin\Billing Rates\Rates 2025.docx OUTSIDE SERVICES Charges for special outside services, equipment, and facilities not furnished by Biggs and Mathews will be billed at cost plus 15%. Such charges may include the following services: Printing and photographic reproduction Tolls Rented vehicles Rented equipment Transportation on public carriers Shipping charges Subconsultants Meals and lodging Special fees, permits, insurance, etc. Consumable materials COMMUNICATIONS The cost of communications including express mail, postage and routine copying costs will be charged at a flat rate of 3% of total gross labor charges. DIRECT CHARGES Auto/Truck per mile $ 1.00 Auto/Truck per day $100.00 Storage of samples per month per container* $ 5.00 Disposal per container* $ 50.00 Survey Equipment per day $ 250.00 *A container is defined as a standard core box, a capped Shelby tube, or a sealed five- gallon bucket. SUPPLEMENTAL SCHEDULES OF CHARGES (Schedules available upon request) •Soils Laboratory •Chargeable Equipment Schedule •Chemical Laboratory Payment Monthly invoices are to be paid within 30 days from invoice date. Interest on late payments will be charged at a rate of 18% per annum. Docusign Envelope ID: AAB8A0DB-7DC6-4BB7-87A1-314E96CB3CFF Certificate Of Completion Envelope Id: AAB8A0DB-7DC6-4BB7-87A1-314E96CB3CFF Status: Completed Subject: ***Purchasing Approval***8525-011 Amendment 1 Source Envelope: Document Pages: 10 Signatures: 4 Envelope Originator: Certificate Pages: 6 Initials: 1 Crystal Westbrook AutoNav: Enabled EnvelopeId Stamping: Enabled Time Zone: (UTC-06:00) Central Time (US & Canada) 901B Texas Street Denton, TX 76209 crystal.westbrook@cityofdenton.com IP Address: 198.49.140.104 Record Tracking Status: Original 1/13/2026 4:32:57 PM Holder: Crystal Westbrook crystal.westbrook@cityofdenton.com Location: DocuSign Signer Events Signature Timestamp Crystal Westbrook crystal.westbrook@cityofdenton.com Senior Buyer City of Denton Security Level: Email, Account Authentication (None) Completed Using IP Address: 198.49.140.104 Sent: 1/13/2026 4:34:25 PM Viewed: 1/13/2026 4:35:16 PM Signed: 1/13/2026 4:35:51 PM Electronic Record and Signature Disclosure: Not Offered via Docusign Lori Hewell lori.hewell@cityofdenton.com Purchasing Manager City of Denton Security Level: Email, Account Authentication (None) Signature Adoption: Pre-selected Style Using IP Address: 198.49.140.10 Sent: 1/13/2026 4:35:54 PM Viewed: 1/13/2026 5:00:09 PM Signed: 1/13/2026 5:00:38 PM Electronic Record and Signature Disclosure: Not Offered via Docusign Leah Bush leah.bush@cityofdenton.com Security Level: Email, Account Authentication (None) Signature Adoption: Pre-selected Style Using IP Address: 198.49.140.104 Sent: 1/13/2026 5:00:40 PM Viewed: 1/13/2026 5:02:57 PM Signed: 1/13/2026 5:04:07 PM Electronic Record and Signature Disclosure: Accepted: 1/13/2026 5:02:57 PM ID: af0f01d0-e81d-41cb-b25b-2189c10eb805 Gregory Adams gadams@biggsandmathews.com Secretary Security Level: Email, Account Authentication (None)Signature Adoption: Pre-selected Style Using IP Address: 128.92.63.242 Sent: 1/13/2026 5:04:09 PM Resent: 1/21/2026 3:16:04 PM Viewed: 1/22/2026 9:55:47 AM Signed: 1/22/2026 9:57:12 AM Electronic Record and Signature Disclosure: Accepted: 1/22/2026 9:55:47 AM ID: e8c3c1a9-062d-4528-8db7-d86453f0426f Signer Events Signature Timestamp Brenda Haney brenda.haney@cityofdenton.com Director Security Level: Email, Account Authentication (None)Signature Adoption: Pre-selected Style Using IP Address: 198.49.140.10 Sent: 1/22/2026 9:57:14 AM Viewed: 1/22/2026 9:58:31 AM Signed: 1/22/2026 9:59:03 AM Electronic Record and Signature Disclosure: Accepted: 1/22/2026 9:58:31 AM ID: 3d6f0f2b-0392-454a-86f9-cbee3d561a2f Crystal Westbrook crystal.westbrook@cityofdenton.com Senior Buyer City of Denton Security Level: Email, Account Authentication (None) Signature Adoption: Pre-selected Style Using IP Address: 198.49.140.10 Sent: 1/22/2026 9:59:05 AM Viewed: 1/22/2026 2:20:10 PM Signed: 1/22/2026 2:20:18 PM Electronic Record and Signature Disclosure: Not Offered via Docusign In Person Signer Events Signature Timestamp Editor Delivery Events Status Timestamp Agent Delivery Events Status Timestamp Intermediary Delivery Events Status Timestamp Certified Delivery Events Status Timestamp Carbon Copy Events Status Timestamp Marcella Lunn marcella.lunn@cityofdenton.com Senior Deputy City Attorney City of Denton Security Level: Email, Account Authentication (None) Sent: 1/13/2026 5:00:40 PM Viewed: 1/13/2026 5:11:10 PM Electronic Record and Signature Disclosure: Not Offered via Docusign Cheyenne Defee cheyenne.defee@cityofdenton.com Procurement Administration Supervisor City of Denton Security Level: Email, Account Authentication (None) Sent: 1/22/2026 2:20:21 PM Electronic Record and Signature Disclosure: Not Offered via Docusign Randall Morris randall.morris@cityofdenton.com Landfill Manager Security Level: Email, Account Authentication (None) Sent: 1/22/2026 2:20:22 PM Electronic Record and Signature Disclosure: Accepted: 1/15/2026 8:26:59 AM ID: b7a6f2ff-ead3-4762-b54f-ebe84710eb67 Witness Events Signature Timestamp Notary Events Signature Timestamp Envelope Summary Events Status Timestamps Envelope Sent Hashed/Encrypted 1/13/2026 4:34:26 PM Certified Delivered Security Checked 1/22/2026 2:20:10 PM Signing Complete Security Checked 1/22/2026 2:20:18 PM Completed Security Checked 1/22/2026 2:20:22 PM Payment Events Status Timestamps Electronic Record and Signature Disclosure ELECTRONIC RECORD AND SIGNATURE DISCLOSURE From time to time, City of Denton (we, us or Company) may be required by law to provide to you certain written notices or disclosures. 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