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HomeMy WebLinkAboutDepartment of Public Works & Engineering Augusta Richmond GA DOCUMENTNAME:1)~m~ cW'Vv-bk WDrt<.s ~ EOh.<-e.0~ DOCUMENT TYPE: TIeerY"'ent , YEAR: 0 l-i BOX NUMBER: 23 FILE NUMBER: 111-1 \ ~ NUMBER OF PAGES: ~ . , I , ,.: ,~'I ~ ~. . F .-' AUGUSTA-RICHMOND ,COUNTY D~P ARTMENT OF PUBLIC WORKS & ENGINEERING . SUPPLEMENTAL AGREEMENT ( ( Project No. 323-04-20182310t 6JJ' SUPPLEMENTAL AGREEMENT NO.,...Y' P.O. No. 53297 WHEREAS, We, W. R. Toole Engineers, Inc., Consultant, entered into a contract with Augusta- Richmond County on November 7, 2001, for engineering design services associated with the ARC Drainage Improvements, Phase II Project No. 323-04-2018231O~..:!ile Reference No. 04- 014 (A), and Ci( WHEREAS, certain revisions to the design requested by Augusta-Richmond County are not covered by the scope of the original contract, we desire to submit the following Supplemental Agreement to-wit: "~.j'.::"'" Professional Services Concerning Erosion And Drainage Improvements Adjacent To The Property Located At 3002 Vassar Drive (parcel 65-Tax Map 25.3) It is agreed that as a result of the above modification the contract amount. is increased by the amount of $4,300 from ~o a total of~. fl\\,.J~ t>"'"' fllt),~ Any modifications to submittal dates shall be as identified in the attached proposal. This agreement in no way modifies or changes the original contract of which it becomes a part, except as specifically stated herein. NOW, THEREFORE, We, W. R. Toole Engineers, Inc., Consultant, hereby agree to said Supplemental Agreement consisting of the above mentioned items and prices, and agree that this Supplemental Agreement is hereby made a part of the original contract to be performed under the specifications thereof, and that the original contract is in full force and effect, except insofar as it might be modified by this Supplemental Agreement. This I day of RECOMMEND FOR APPROVAL: 2004. ~~lart (FO Approved: Date 3/~oi [ATTACH CORPORATE SE ~ .. f\ n ATTEST$:J(.,/~ Title: f)le{..u::liv~ tk;I~i.~, (SAOl - For changes less than $10,000) January 2001 " This proposal outlines the project background, existing conditio~, proposed scope and compensation associated with the upstream improvements proposed for the Augusta- Richmond County (ARC) Phase I Drainage Improvements Project - Vassar Drive. PROJECT BACKGROUND Specific improvements associated with the Augusta-Richmond County (ARC) Phase I Drainage Improvements Project are being installed near the intersection of Vassar Drive and Oberlin Road in Augusta, Georgia. W.R. Toole Engineers designed the proposed improvements during 2002-2003. The scope of the existing project was limited to improving the Oberlin Road culvert and the existing ditch section downstream of Oberlin Road to the culvert crossing at White Owl Forest Drive. Design characteristics of the existing project include: . The removal and replacement of an existing culvert along Oberlin Road near the intersection of Vassar Drive. . The installation of concrete ditch paving and energy dissipation structures downstream of the culvert improvements to White Owl Forest Drive. Wetlands exist within the bed and banks along the upper limits of the project area Gust upstream of Oberlin Road). For this reason, the project is permitted via the US Army Corps of Engineers (USACOE) Nationwide 3 permit (Maintenance). EXISTING CONDITIONS The upper limits of the existing project are located adjacent to the property located at 3002 Vassar Drive (parcel 65-Tax Map 25.3). Stream bank erosion is occurring adjacent to the residential structure located on the property. The area of concern exists approximately 70-feet upstream (northwest) of the right-of-way of Oberlin Road. This area was not included in the scope of the existing improvements project. During a July 2, 2002 meeting between Toole Engineers and ARC, Ms. Teresa Smith expressed concern regarding the erosion that is occurring upstream of the existing project area. Toole Engineers acknowledged the eroded conditions and recommended that ARC evaluate the existing problematic area and determine if an expansion of the project scope is warranted. The issue of the upstream erosion arose again during the field plan review for the Phase I Drainage Project, which was held on January 16,2003. Toole was asked to evaluate the concept of extending the proposed box culvert system upstream for a distance of approximately 60-feet. Toole addressed the concept in a January 28, 2003 letter to Ms. Teresa Smith, which outlined four design constraints associated with the concept. Subsequently, Toole Engineers was instructed to make no further changes to the Vassar Drive design plans. ~ PROPOSED~ROVEMENTS-PROJECTSCOPE At the request of the 3002 Vassar Drive property owner, a meeting was held on Friday, January 23, 2004 to discuss possible improvements for the eroded areas and to investigate concerns relating to the structural integrity of the residence. Representatives of ARC, Toole Engineers and Cranston, Robertson & Whitehurst (CRW) attended this meeting. ARC proposed the construction of a retaining wall adjacent to the existing residential structure. The proposed wall would be constructed along the toe of the existing stream bank for a distance of approximately 90-feet upstream of the Oberlin Road culvert improvements. Additional grading and stream bank stabilization are proposed for a distance of l80-feet upstream of the Oberlin Road right-of-way. Toole Engineers understands that the project scope will be limited to the following improvements: . The proposed gabion wall adjacent to the residential structure located at 3002 Vassar Drive (parcel 65-Tax Map 25.3). Originally, a reinforced concrete retaining wall was proposed; however, subsequent discussions involved the installation of gabions in lieu of a concrete wall. The proposed gabion wall would tie into the Oberlin Road culvert improvements and extend approximately 90-feet upstream. . Proposed stream bank grading and stabilization for a distance of 180- feet upstream of Oberlin Road. The stream banks will be stabilized using riprap, permanent grassing, erosion control matting and other Best Management Practices (BMPs) as necessary to assure a stable bank and minimize future erosion. As previously noted, the existing project is permitted for wetland disturbances through a USACOE Nationwide 3 permit. ARC has informed Toole that a Nationwide 13 permit would be required for the improvements proposed above. Toole Engineers completed the Nationwide 13 application and submitted it to ARC for execution on Tuesday, January 20, 2004. A revised permit was executed by ARC on Thursday, January 29, 2004 and faxed to Mr. David Crosby at the USACOE, Savannah District. PROFESSIONAL SERVICES AND COMPENSATION Based on the proposed project scope, W.R. Toole Engineers proposes to complete the project with the following tasks: SURVEYING SERVICES - No additional field surveying will required. ENGINEERING SERVICES - Toole Engineers will prepare preliminary plan limits and a typical section depicting proposed improvements for contractor estimating purposes. Subsequent construction plans will be prepared showing the proposed wall and associated details, the proposed stream bank grading and stabilization measures, specific site work specifications and any incidental utility construction recommendations. The plans will be . . designed with standard erosion control measures as outlined in t1:ie ManUal for Erosion and Sediment Control in Georgia, latest edition, and the National Pollutant Discharge Elimination System (NPDES). Toole Engineers understands that the proposed improvements will be accomplished by change order to the existing contract. Thus, no stormwater sampling, recording or monitoring activities are included in this proposal. Contract documents, technical specifications, construction inspection and construction staking are also not included in this proposal. Should these services be required, we will provide you with a separate fee proposal. . No structural recommendations will be included in the construction documents relating to the existing residential structure at 3002 Vassar Drive. Toole Engineers is of the understanding that these recommendations will be made by other design professionals, as required. ENVIRONMENTAL SERVICES - Toole Engineers has submitted the Nationwide 13 permit application to the USACOE as noted above. Should the USACOE require any permitting other than the Nationwide 13 permit, Toole will provide these services through a separate fee proposal. Toole Engineers proposes to perform the professional services noted above for a lump sum fee of $4,300. DELIVERABLES Toole will provide preliminary sketches for contractor estimating purposes. Following, Toole will prepare construction plans based on the project scope noted above and submit the following: . Final Engineering Documents: Three (3) sets offmal construction documents, one (1) construction cost estimate and one (1) compiled easement map. PROJECT SCHEDULE Toole Engineers will initiate professional services for this project within two (2) days of your formal notice to proceed. Toole estimates that final engineering documents can be submitted to ARC within twelve (12) business days of the formal Notice to Proceed. The time frame provided is an estimate based on the project scope noted in this proposal and does not include ARC review time or delay associated with permitting or easement acquisition. A definitive project schedule can be provided at project inception.