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Home My WebLink AboutKnapp Street Quarry Landfill Amendment AECOM AECOM 920.235.0270 tel /'7� 558 North Main Street 920.235.0231 fax Oshkosh, Wisconsin 54901 February 2, 2010 Mr. David Patek, P.E. Director of Public Works Department of Engineering City of Oshkosh 215 Church Avenue P.O. Box 1130 Oshkosh, Wisconsin 54903 -1130 Subject: Proposal for Providing Project Management, Construction Documentation, and System Operation and Maintenance Through December 2010 for the Proposed Methane Venting System for the Knapp Street Quarry Landfills AECOM Project No. 60141423 - City Contract Number 10 -08 Dear Mr. Patek, The former Faber and Oshkosh Stone Company Quarries (collectively referred to as the Knapp Street Quarries or Quarry Park) were reportedly filled with municipal refuse and building demolition from approximately 1955 to 1964. These quarries, historically developed to mine dolomite bedrock, range from approximately 35 feet deep at the former Faber site to approximately 75 feet deep at the former Oshkosh Stone site. The municipal refuse deposited in these quarries is the apparent source of documented methane generation. In March 1979, an explosion and flash fire occurred on the north side of the duplex located at 1527/1529 Knapp Street. Methane monitoring conducted at locations within the waste material and beyond the perimeter of the waste material, indicates persistent concentrations of methane. Shallow gas venting trenches were installed in some areas of the site perimeter in 1979 and methane detection meters have been installed in several of the residences bordering the quarry properties. In general, subsurface conditions consist of approximately 6 to 8 feet of silty clay overlying approximately 2 to 3 feet of residual, weathered bedrock. More competent fractured bedrock is present at a depth of about 10 feet from the ground surface and extends to over 100 feet below grade. Environmental monitoring conducted at the Quarry Park landfills, indicate groundwater levels have been steadily decreasing over time. In the early 1980s, the groundwater table was typically less than 10 feet from the ground surface while recent monitoring indicates groundwater levels are now greater than 20 feet below grade. Because gas migration occurs more readily in the unsaturated zone of the subsurface, this decrease in water levels has created a more significant migration pathway for vapors generated by decomposition of the waste material. The shallow gas vents installed years ago were adequate for addressing methane migration in the shallow To enhance and sustain the world's built, natural and social environments M: \LIBRARY\FieldServicesProposal \City of Oshkosh \Contract 10- 081Proposal _City_Contract_10- 08.docx AECOM 2 unsaturated zone; however, they have limited influence on gas migration through the unsaturated bedrock fractures. As outline in our proposal dated October 6, 2009, AECOM has completed engineering design, preparation of bidding plans and specifications, and bidding of an active gas venting system to mitigate methane migration, which is occurring in the fractured bedrock at a depth of 10 to 20 feet below grade. This proposal provides a cost estimate to provide services related to assisting with Project Management, construction documentation including operation and maintenance through December 2010. An outline of proposed services is provided below. • Provide a full time construction technician on site during significant construction efforts to document depth of trench, location of gravel backf ill, elevations of pipe invert and locations of other construction features. • Provide laboratory material testing to document conformance with plans and specifications. At this time we anticipate gradation testing of gravel backfill, compaction control (proctor) testing of clay capping material. • Review of contractor pay requests. • Preparation of record drawings. • Vapor emissions sampling and analysis during initial startup to compare to air quality standards. • Preparation of a construction documentation report which will include record drawings and results of emissions monitoring for submission to WDNR. Prepare Daily Field Reports detailing the work performed, weather conditions, contractor staffing, contractor equipment, pertinent conversations with contractor, owner, and engineer. • Provide photo documentation throughout the construction period • Provide vehicles, necessary equipment, and material for inspection. • Provide field staff to operate and maintain the venting system. • Preparation of a operating conditions report following 6 months of operation for submission to WDNR. Estimated Cost The estimated cost for completing project management, construction documentation, and operation and maintenance through December 2010 is $125,000 as summarized in the table below. Service Estimated Fee Project Management (4 months) $ 12,000 Construction Documentation (4 months) $ 80,000 Operation and Maintenance (7 months) $ 33,000 TOTAL ESTIMATED COST $ 125,000 To enhance and sustain the world's built, natural and social environments M:\LIBRARY1FieldServicesProposal \City of Oshkosh \Contract 10 -08\ Proposal _City_Contract_10- 08.docx AECOM 3 We propose to provide the services described in this proposal on a time and material basis in accordance with the previously negotiated General Conditions of Service with the City of Oshkosh. Please indicate your acceptance of this proposal by having an authorized representative execute the attached Authorization Form and return it to our office. We appreciate the opportunity to provide environmental engineering services to the City of Oshkosh. If you have any questions regarding the proposed project approach or corresponding costs, please contact us at your convenience. Sincerely yours, Paul J. Killian, P.E. Regional Practice Area Leader — Remediation Consulting and Engineering Pau F. Timm Wisconsin CQA Manager Attachments: Authorization Form To enhance and sustain the world's built, natural and social environments M :\LIBRARY\FieldServicesProposal \City of Oshkosh\Contract 10- 081Proposal _City_Contract_10- 08.docx A _ AECOM 920.235.0270 tel � 558 North Main Street 920.235.0231 fax Oshkosh, Wisconsin 54901 February 2, 2010 Authorization I hereby authorize AECOM, Inc. dba AECOM Environment to proceed with the scope of work for the for environmental consulting services related to project management, construction documentation, and operation and maintenance through December 2010 the methane venting system at the Knapp Street Quarry Landfills, Oshkosh, Wisconsin as described in AECOM's proposal dated February 2, 2010, with a budget authorization of $125,000 under the general terms and conditions specified in the proposal. See Page 4A February 2, 2010 Signature Date Print Name City of Oshkosh Title /Organization To enhance and sustain the world's built, natural and social environments M : \LIBRARY\FieldServicesProposal \City of Oshkosh \Contract 10 -08\ Authorization _City_Oshkosh_10- 08.docx Signed for and in behalf of the City of Oshkosh Mark A. Rohloff, City Manager �t & 1—■.011 jip Pamela R. Ubrig, City Clerk Ly • L i renson, , 'tyAtt i ey 1 }< , i (u, / roc Peggy Stceno, Director of Finance A ssr. I hereby certify that the necessary provisions have been made to pay the liability which will accrue under this contract. 4A