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HomeMy WebLinkAboutCORRESPONDENCE - PURCHASE ORDER - 9190954April 30, 2019 Ms. Bonnie Pierce, Ph.D. Senior Specialist, Scientist Environmental Regulatory Affairs City of Fort Collins bpierce@fcgov.com 970-416-4255 Subject: Proposal to Characterize Contaminants of Concern at Larimer County Landfill Boundary and Off-Site and Assessment of Corrective Measures for the City of Fort Collins, Colorado Dear Ms. Pierce: AECOM appreciates the opportunity to provide the City of Fort Collins with our proposal to characterize the contaminants of concern at the Larimer County Landfill boundary and off-site and to provide an Assessment of Corrective Measures. Our proposal has been prepared in response to the request for bid issued by the City of Fort Collins on April 11, 2019. AECOM is currently working on several long-term projects with other clients covering similar scopes of work providing hydrogeologic input and management of the groundwater monitoring programs and data evaluation in support of the requirements for the State of Colorado Solid Waste Regulations. The scope presented in the following proposal and the project team selected for this work draws from our experience on similar projects. AECOM has an established working relationship with the City and have been successfully supporting the City for the past four years through environmental assessment and air quality projects. We can provide local support for this project through our Fort Collins office. Based on our local and regional staff capabilities we are qualified to support each of the technical areas identified in the Scope of Work. We look forward to working with you and appreciate this opportunity to provide environmental services to the City of Fort Collins. Please contact Vasanta Kalluri at (303) 228-3058 with any questions. Yours sincerely, AECOM Technical Services, Inc. Vasanta Kalluri Environmental Engineer/ Project Manager Margaret Zebley, P.E. Remediation Department Manager Environment Business Unit Error! Unknown document property name. ERROR! UNKNOWN DOCUMENT PROPERTY NAME. Error! Unknown document property name. Error! Unknown document property name.2 Error! Unknown document property name. Use or disclosure of data contained on this sheet is subject to the restriction on the first page of this document. Proposal for Environmental Characterization and Assessment of Corrective Measures for the Larimer County Landfill, City of Fort Collins, Colorado April 30, 2019 City of Fort Collins Proposal i This document includes proprietary data that shall not be duplicated, used or disclosed outside Simon for any purpose other than to evaluate this document. This restriction does not limit Simon’s right to use information contained in this document if it is obtained from another source without restriction. Table of Contents Project Background ............................................................................................................................... 1 Project Understanding ........................................................................................................................... 1 AECOM’s Relevant Experience ............................................................................................................. 2 Project Example No. 1 – Platte River Power Authority, Rawhide Facility............................................. 2 Project Example No. 2 – XCEL Energy, Various Power Stations in Colorado ..................................... 2 Project Example No. 3 – Colorado Springs Utilities, Clear Spring Ranch ............................................ 3 Project Example No. 4 – Garfield County Landfill, Garfield County, Colorado ..................................... 3 Project Team ........................................................................................................................................ 3 Technical Approach .............................................................................................................................. 5 Task 1.0 – Hydrogeologic Evaluation and Characterization of Contaminants of Concern at Landfill Boundary and Off-Site ....................................................................................................................... 6 Task 2.0 – Assessment of Corrective Measures (ACM) ...................................................................... 7 Schedule............................................................................................................................................... 8 Project Budget ...................................................................................................................................... 8 Additional Assumptions ......................................................................................................................... 9 Limitations ............................................................................................................................................ 9 References ........................................................................................................................................... 9 City of Fort Collins Proposal 1 Use or disclosure of data contained on this sheet is subject to the restriction on the first page of this document. Project Background This project background and the scope of work presented in this proposal are based on the documents provided to AECOM with the request for bid issued by the City of Fort Collins on April 11, 2019. Larimer County has been operating the Larimer County Landfill (Landfill) since 1995 to monitor impacts in surface water and groundwater related to disposal activities at the facility. Monitoring at the Landfill has been completed in accordance with the United States Environmental Protection Agency (USEPA) and Colorado Department of Public Health and the Environment (CDPHE) regulations including the Federal Criteria for Municipal Solid Waste Landfills (40 Code of Federal Regulations [CFR] 258) and the State Regulations Pertaining to Solid Waste Sites and Facilities (6 Code of Colorado Regulations [CCR] 1007-2). The Landfill is a municipal solid waste (MSW) landfill that has been in operation since 1963 located southwest of Fort Collins, Colorado. The Landfill has a footprint of 180 acres and is situated in the north half of a 650 acre site. The southern half of the site serves as a borrow area for cover soil. The Landfill does not have a bottom liner or leachate collection system and finished areas are covered with a compacted-clay cap. Approximately forty percent of the landfill area is now covered with the remaining area to be closed in phases as filling progresses. Project Understanding Our understanding of the project objective is to characterize contaminants of concern at both the landfill boundary and offsite; and to complete an Assessment of Corrective Measures (ACM) to address impacts to groundwater. Since 1965, the approved corrective action process, agreed between CDPHE and Larimer County for has been monitored natural attenuation (MNA). However, due to the complex hydrogeologic and geologic conditions, in a letter dated September 15, 2016, CDPHE requested a re- evaluation of the site hydrogeologic assessment for identifying possible data gaps and to improve the understanding of the effectiveness of the current groundwater monitoring network and potential data gaps. Larimer County’s contractor (Trihydro Corporation [Trihydro]) submitted a Groundwater Monitoring Network Evaluation and Site Investigation Work Plan in response to CDPHE’s request which was approved on July 17, 2017. Trihydro completed site assessment activities in accordance with the Work Plan. Conclusions related to the CDPHE September 15, 2016 comments included: · The vertical and horizontal extent of vinyl chloride was delineated. · The vertical and horizontal chlorinated volatile organic compounds (CVOCs) plume was delineated in the Northern Aquifer indicating monitored natural attenuation (MNA) is likely occurring. · The 1,4-dioxane plum extends slightly further than the CVOC plume and has not been fully delineated in the Northern Aquifer. The 1,4-dioxane plume in the Southern Aquifer appears to be discharging into Smith Creek as it was detected in a surface water sample collected. Further delineation of 1,4-dioxane is needed. · Regional agricultural practice likely has contributed to elevated calcium, magnesium, sodium, and sulfate concentrations. It is unclear how much landfill leachate or agricultural practices are contributing to the calcium and magnesium concentrations. · Alternative source demonstrations for sulfate and nitrate are on-going and will be further evaluated by Trihydro following additional sampling. Based on these conclusions, on April 11, 2019, the City of Fort Collins requested a proposal to characterize the contaminants of concern at the Larimer County Landfill boundary and off-site on City property and to provide an Assessment of Corrective Measures. AECOM proposes conducting the scope of work through the following tasks: City of Fort Collins Proposal 2 Use or disclosure of data contained on this sheet is subject to the restriction on the first page of this document. · Task 1.0 – Evaluate available monitoring data from 1984 to present from the North and South Aquifers with focus on the landfill boundary and offsite contamination that potentially impacts the City property and prepare a Hydrogeologic Evaluation Report. The Report will include determining the nature and extent of contamination, developing iso-concentration plots to show contaminant distribution, and evaluating contaminant fate and transport to develop a preliminary site conceptual model. · Task 2.0 – Complete an Assessment of Corrective Measurements (ACM) analyzing the effectiveness of at least three potential corrective measures for meeting the requirements and objectives of the remedy as described under 40 CFR 258.57 and to evaluate if interim measures are required prior to remedy selection to minimize environmental contamination, control or mitigate off site migration, if necessary, promote effective remediation, and prevent the public’s exposure to contaminants of concern. We will work collaboratively with the City of Fort Collins in performing our hydrogeologic evaluation and subsequent reporting. On completion of Task 1.0, we will prepare an ACM with the City of Fort Collins’ input to address offsite groundwater contamination. This ACM will be completed in accordance with the applicable Federal and State regulations. AECOM’s Relevant Experience AECOM has considerable and ongoing experience with projects similar to those described in the City of Fort Collins’ scope of work. Below we have provided brief project summaries of four ongoing projects located within the State of Colorado that are aligned with components requested by the City of Fort Collins. Project Example No. 1 – Platte River Power Authority, Rawhide Facility AECOM is supporting Platte River Power Authority (PRPA) in adherence to the State of Colorado and Federal regulations including the State of Colorado Solid Waste Section 6 and Section 9, Appendix B regulations and in the parallel work for the responses to the USEPA Coal Combustion Residuals regulations. The regulated units include the ash landfill, ash ponds, and phosphorous removal system ponds. We are providing ongoing expertise and support in the completion of hydrogeologic assessments, developing compliant groundwater monitoring networks, performing groundwater monitoring, and completing statistical evaluations. These differing technical streams are conducted to maintain compliance with requirements of the applicable regulatory programs, and to develop strategy and paths forward for understanding of site characteristics and to address identified issues. For example, evaluation of geologic, hydrologic, and facility management practices has been used to develop alternate source demonstrations to determine whether specific chemicals present in the groundwater may be sourced from underlying Pierre Shale bedrock or due to operational practices, or both. Our work is being completed collaboratively with PRPA with the intent of developing, performing, and evaluating compliant monitoring programs, and, as necessary, developing the appropriate assessment monitoring and corrective measures when statistically significant increases (SSI’s) are identified. Our work has included participation in multiple meetings and discussions with CDPHE to resolve potential issues, and with PRPA in the development of a longer-term strategy for management of regulated units. Project Example No. 2 – XCEL Energy, Various Power Stations in Colorado AECOM manages the groundwater assessment program for XCEL Energy at seven power stations under the State of Colorado, Solid Waste Section 6 and Section 9 regulations. The units include existing and closed landfills and various impoundments. This is a 5-year program, and our role is to conduct the semi-annual or annual groundwater sampling and analytical programs, prepare reports in accordance with the schedule required by CDPHE, and to complete ongoing analysis of the analytical data including understanding potential influences to SSIs from hydrogeologic conditions not related to power station operations. We are also conducting and documenting semi-annual City of Fort Collins Proposal 3 Use or disclosure of data contained on this sheet is subject to the restriction on the first page of this document. landfill inspections at one of the facilities. The project objective is to maintain compliance for XCEL with the established groundwater monitoring programs that have been approved by CDPHE for each facility. Project Example No. 3 – Colorado Springs Utilities, Clear Spring Ranch AECOM performed a detailed comparison of the State of Colorado and Coal Combustion Residuals regulations to develop a long-term strategy to manage the regulated units under the USEPA Coal Combustion Residuals regulations. Specifically, for the Landfill regulated through the State of Colorado and Coal Combustion Residual regulations we have performed a hydrogeologic assessment of the area based on data from an extensive monitoring well network. From this hydrogeologic assessment, we have developed a site-specific groundwater monitoring program to meet the Coal Combustion Residual regulations requirements. Similar to the hydrogeologic regime at Larimer County Landfill, this site has a complex physical, geologic and hydrogeologic regime, with micro influences such that the groundwater characteristics can be subtly different even in adjacent groundwater monitoring wells. Project Example No. 4 – Garfield County Landfill, Garfield County, Colorado In collaboration with our teaming partner, NWCC Consultants, we have provided ongoing support to Garfield County Landfill on compliance, environmental, operational, and strategic planning for eight years. Our ongoing support includes completing an evaluation of soil, groundwater and soil gas data to better understand not only landfill gas, but also the presence of naturally occurring gases since the Landfill is located within an actively producing natural gas field. Our understanding of the hydrogeologic regime allowed us to develop and implement an efficient landfill gas monitoring system. Our work has included preparation of a Strategic Solid Waste Management Plan that has been used to guide identification of strategic opportunities, marketing, operational, and management decisions for the Landfill. This work has helped to create a financially strong and efficient model for running the Landfill. One of the strategic opportunities AEOM identified included an innovative treatment system for petroleum contaminated soils that would help reduce costs as treated soil can be used as the daily soil cover, which otherwise would have to be purchased. AECOM designed and implemented this innovative treatment system. We led meetings with the Air Pollution Control Division (APCD) of CDPHE to work through permitting requirements as this process did not fit into the typical processes that fall under APCD’s jurisdiction. This high profile project has received significant local attention and below is a link to a local TV station broadcast featuring the Garfield County Landfill: http://www.westernslopenow.com/news/local-news/landfill-gets-new-eco-friendly-system Additionally, we have prepared numerous air permits for the Garfield County Landfill, including the Title V air permit. Our involvement included leading negotiations with CDPHE and developing and an assessment and monitoring program. Additionally, AECOM’s Colorado team has prepared ACM documents for United States Air Force bases, Army Corps of Engineers, oil companies, and various States and municipalities across the United States. The regulatory programs under which these ACMs have been prepared are similarly varied, from CERCLA programs to State-regulated programs. Project Team Given the complexity of the project scope and the interlocking technical areas between the two principal tasks, we chose a small technical team of experienced senior technical staff to provide project leadership. They will be supported by mid-level and junior staff, as appropriate. Our project team has City of Fort Collins Proposal 4 Use or disclosure of data contained on this sheet is subject to the restriction on the first page of this document. been built with the personnel supporting the projects summarized in the previous section or other similar projects. Therefore, we are not only providing our active experience, but also an institutional understanding of how CDPHE views compliance and response to the applicable Solid Waste regulations. Our organization chart identifying the key project personnel is shown below. We are confident that the AECOM team assembled for this project has the necessary expertise to efficiently fulfill the project objectives and be fully supportive of City of Fort Collins. We will utilize personnel from both our Fort Collins and Greenwood Village offices to meet the project schedule and technical requirements. With the project manager and other project staff located in Fort Collins, AECOM will provide expedited and cost-efficient services for in-person collaboration meetings that this project could require. Below are brief biographies for the project team, highlighting the key attributes and experience each person brings that are specific to the needs for this project. We would be pleased to provide resumes for our project team personnel if requested by the City of Fort Collins. Our task lead personnel will manage each task, and to help control project costs we will utilize more junior personnel wherever appropriate. Ms. Vasanta Kalluri, PE, Project Manager Vasanta Kalluri based in our Fort Collins office will serve as the project manager. She has almost 20 years of experience managing and providing technical support on environmental investigation and remediation projects. She is a professional engineer (Wisconsin, Minnesota, and Colorado PE in progress) and has worked on similar solid waste landfill evaluation projects in Wisconsin and Ohio. Ms. Kalluri has experience with data evaluation, statistical trend analysis, fate and transport analysis, assessment of corrective measures, remediation design and implementation. She will work with the technical leads for this project to deliver quality products, on time and within budget. Ms. Kalluri will participate in project meetings with the City of Fort Collins and other stake holders and will be the primary contact for the City of Fort Collins’ project manager. Along with the project team listed below, Ms. Margaret Zebley will continue her role as the overall Program Manager and an alternate line of communication for the City of Fort Collins, as presented in our 8631 General Environmental Services Proposal (January 2018). City of Fort Collins Proposal 5 Use or disclosure of data contained on this sheet is subject to the restriction on the first page of this document. Mr. Geoffrey Webb, Principal Geoff Webb will serve as Principal-in-Charge, acting as a senior resource throughout the project. Geoff brings 40 years of diverse professional experience including work with various utility companies on environmental and remediation projects and is the project manager of our illustrated projects for the Platte River Power Authority, Colorado Springs Utilities, and Garfield County. He has managed numerous multidisciplinary projects, including many that involved working within regulatory requirements of RCRA, CERCLA, and CDPHE. Currently, he is part of the AECOM National Practice initiative for our Coal Combustion Residual projects, and on projects within Colorado, he is involved in developing project strategies for sites where both the Coal Combustion Residual rules and CDPHE Solid Waste regulations are applicable. Ms. Katherine Nicholas, PG, Hydrogeological Evaluation Lead Task 1 will be led by Katherine Nicholas, PG (WY), a qualified groundwater scientist as defined in 6 CCR 1007-2, Section 1. Ms. Nicholas is a Senior Geologist with 12 years of experience working on groundwater-related projects. Ms. Nicholas currently serves as project manager for the Colorado Springs Utilities projects and works collaboratively with Colorado Springs Utilities and CDPHE to develop a path forward to determine hydrogeologic conditions at an alum sludge pond in Colorado Springs. Ms. Nicholas has also worked with municipalities including Campbell County and Sheridan County on similar projects under the regulation by the Wyoming Department of Environmental Quality (WDEQ). Katherine worked collaboratively with Campbell County and WDEQ to develop hydrogeologic evaluations and providing an evaluation of data and hydrogeologic conditions for Campbell County Landfills No. 1 and No. 2 in Gillette, Wyoming. Ms. Nicholas has previously served as project manager, task manager, or field lead for large multi-faceted field sampling programs. Ms. Naseem Hasan, PE, Assessment of Corrective Measures Lead Task 2 will be led by Naseem Hasan. Ms. Hasan is a licensed Professional Engineer (CO) and chemical engineer with over 30 years of experience in environmental engineering. Ms. Hasan has extensive experience developing ACMs for CVOC and 1,4 dioxane in Colorado and other states and is a member of the ITRC 1,4-dioxane team. Her expertise is soil and groundwater remediation including corrective measure/feasibility studies, treatability studies, remedy assessment, cost estimation and site closure. Ms. Hasan has decades of experience in evaluating treatment technologies and formulating corrective measure alternatives to support remedy selection for RCRA, CERCLA and other sites. As part of comparative analysis of corrective measure assessment, Ms. Hasan analyzes potential impacts of corrective measure alternatives, considering cross-media impacts and sustainability, implementation timeframe, cost-effectiveness and other related factors. She has developed remedial strategies combining source control, containment or active treatment. She is currently leading the corrective measure assessment of groundwater contamination at the Platte River Power Authority site in Colorado. Ms. Hasan is knowledgeable of federal and state regulatory requirements pertaining to corrective action requirements for landfills. Technical Approach The focus of our technical approach is to evaluate the existing hydrogeological and analytical data to develop a preliminary site conceptual model and prepare an ACM that will assist the City of Fort Collins in determining the path forward. AECOM will use its experience in and knowledge of applicable Federal and State of Colorado Solid Waste Regulations to perform these evaluations in the following two phases: · Task 1.0 – Hydrogeologic Evaluation and Characterization of COCs · Task 2.0 – Assessment of Corrective Measures Based on our preliminary evaluation of the documentation provided by the City of Fort Collins, the following significant hydrogeologic features have been identified: City of Fort Collins Proposal 6 Use or disclosure of data contained on this sheet is subject to the restriction on the first page of this document. · Smith Creek, which originally flowed through the middle of the landfill and was diverted into Fossil Creek. A portion of Smith Creek was then filled with MSW and a slurry wall was installed to divert subsurface water flow. · The former location of Fossil Creek, which was interfering with landfill operations and thus diverted into a channel. The former Fossil Creek was then filled with MSW. · The bedrock divide and subsurface lithology beneath the landfill, including hydrogeologic conditions and groundwater chemistry. Evaluation of these hydrogeological features will be key in developing a site conceptual model and identifying data gaps. Task 1.0 – Hydrogeologic Evaluation and Characterization of Contaminants of Concern at Landfill Boundary and Off-Site The hydrogeologic and geochemical conditions at Larimer County Landfill are complex as the western and upgradient portion of the site is in a different geologic formation and the site is separated by a west-east trending bedrock divide of competent shale. The eastern two-thirds of the site is underlain by the Pierre Shale formation, whereas the Niobrara formation results in geologic outcrops along the west. The bedrock divide separates the shallow groundwater into two aquifers herein referred to as the North Aquifer and South Aquifer. In the Trihydro Site Characterization Report (2018) completed on behalf of Larimer County Landfill, Trihydro indicated that the 1,4-dioxane plume has not been fully delineated in the Northern Aquifer and the 1,4-dioxane plume in the Southern Aquifer appears to be discharging in Smith Creek as of April 2018 (Trihydro, 2018). Trihydro evaluated alternate sources of sulfate, magnesium, sodium, and cadmium and indicated that regional agricultural practices likely contributed to some of the calcium, magnesium, sodium, and sulfate concentrations. However, they further indicated that leachate generally reduces and immobilizes sulfate, but liberates calcium and magnesium so it is unclear how much landfill leachate or agricultural practices are contributing to the calcium and magnesium concentrations (Trihydro 2018). Triyhydro (2018) also indicated a Corrective Measures Assessment and Alternative Source Demonstration Studies are ongoing for sulfate and nitrate. AECOM will review available data and relevant documentation to make an initial assessment of hydrogeologic conditions and groundwater chemistry in accordance with applicable Federal and State regulations, including State of Colorado Solid Waste Section 6 and Section 9, Appendix B regulations. The scope of work under Task 1.0 will include: · Gathering and compilation of available, relevant data collected since 1984 to prepare a data summary. AECOM will compile data provided by the City of Fort Collins into summary tables, as appropriate. Although excel spreadsheets or database exports are preferred, AECOM can compile data from PDF versions of data tables. If data are provided by the City of Fort Collins in an electronic format, AECOM will upload the information into a database. Otherwise, AECOM will compile summary tables, as appropriate. · Evaluation of available site groundwater data and historic geologic and groundwater monitoring reports to understand the conditions in the North and South areas of the Landfill. Data will be evaluated relative to appropriate regulatory limits. We will also evaluate data quality and will identify significant data gaps. · Evaluation of existing well construction and soil boring log details, as available, to further understand the varying geologic and hydrogeologic conditions The contaminant fate and transport analysis presented in this proposal is a 2-dimensional analysis. However, if warranted, AECOM has the capability to perform complex 2- dimensional and 3-dimensional contaminant transport modeling and can provide a separate cost estimate upon request. Additionally, AECOM can perform a City of Fort Collins Proposal 7 Use or disclosure of data contained on this sheet is subject to the restriction on the first page of this document. present at the site. This information will be included in the preparation of lithological cross sections with potentiometric surface and COCs – CVOCs and 1,4-dioxane data. Water table data, potentiometric data, and hydraulic conductivity information (as available) will also be evaluated to understand flow pathways and interaction with surface water. · Evaluation of potential other data, including publicly available literature sources (e.g., USGS) concerning the geology and hydrogeology of the area, well records available from the Colorado Division of Water Resources, records of monitoring wells installed at the facility, geotechnical reports prepared, as applicable, in support of facility construction, and landfill design and construction records and documentation, as available. · Preparation of iso-concentration plots to illustrate the distribution of COCs. These plots will be used to evaluate the nature and extent of COCs. Additionally, aquifer geochemistry will be evaluated to understand its influence on contaminant transformation and migration. Based on this information, AECOM will perform a 2-dimensional fate and transport analysis of the COCs in groundwater. · Statistical trend analysis of the analytical data with emphasis on the significance of changes in water quality over time in offsite monitoring wells and surface water. · Developing a preliminary site conceptual model based on the above-mentioned evaluations and identifying key data gaps associated with understanding contaminant sources and pathway. · Preparation of a Hydrogeologic Evaluation Report summarizing the results of the existing data evaluation, data gap analysis, fate and transport evaluation, and a preliminary site conceptual model with supporting figures and tables. AECOM will provide an electronic draft copy of the report for review and comment by the City of Fort Collins. We will incorporate review comments and submit a final version of the report in a PDF format for the City of Fort Collins’ records and submittal to CDPHE. Our costs (Table 1) include one meeting with City personnel to discuss the results of completion of Task 1.0 and to discuss the draft Report findings prior to finalizing. Task 2.0 – Assessment of Corrective Measures (ACM) In conjunction with the activities described above, AECOM will complete an ACM. This assessment will include data review and professional evaluation of effectiveness of at least three corrective measures to meet the requirements and objectives of the remedy as described under 40 CRF 258.57. The development and evaluation of the corrective measures will also follow state guidance as specified in the Corrective Action Guidance document (CDPHE Hazardous Materials and Waste management Division, May 2002). The assessment will be documented in an ACM report that will include recommendations for improvements, changes, or additional corrective measures required to address contamination migrating offsite. The ACM report will include analysis of the effectiveness of at least three potential corrective measures to meet the requirements and objectives of the remedy as described under 40 CFR 258.57 through addressing the following topics: · The performance, reliability, ease of implementation, and potential impacts of appropriate potential remedies including safety impacts, cross-media impacts, source and boundary control to prevent further releases, and control of exposure to residual contamination. · Time expected for the corrective measure to be effective. · Cost of remedy implementation and maintenance. AECOM has the expertise to support the City of Fort Collins’ Sustainability Goals by including green remediation and sustainability in our ACM alternatives evaluation criteria, if requested. City of Fort Collins Proposal 8 Use or disclosure of data contained on this sheet is subject to the restriction on the first page of this document. · State or local permits or other institutional requirements that may affect implementation of the remedy. The ACM will include an evaluation to determine if interim measures are required for regulatory compliance prior to remedy selection to minimize environmental contamination, promote effective remediation, and prevent the public’s exposure to COCs. Interim measures should be consistent with the remedy objectives and consider the following factors: · Time required to implement the final remedy · Actual or potential exposures of nearby populations, environmental receptors, and visitors to the impacted City Natural Area · Weather conditions that may cause hazardous constituents to migrate or be released We will prepare the Assessment of Corrective Measures Report (ACM Report) presenting the analysis and recommendations for remedy selection that considers both short-term and long-term remedy effectiveness and protectiveness for potential human and environmental receptor exposure. AECOM will provide an electronic draft copy of the report for review and comment by the City of Fort Collins. We will incorporate review comments and submit a final version of the report in a PDF format for the City of Fort Collins’ records and submittal to CDPHE. Our costs (Table 1) include one meeting with the City of Fort Collins to discuss the draft Assessment of Corrective Measures report. Schedule AECOM is able to commence work upon receipt of written approval of this proposal by the City of Fort Collins. The schedule for completion of Tasks 1.0 and 2.0 will be dictated by the State-issued Consent Decree. However, for the City of Fort Collins’ planning purposes, we are providing the following preliminary schedule: · Notice-to-proceed by the City of Fort Collins (May 20, 2019) · Initiate Task 1.0 as the first stage and prepare a draft Hydrogeologic Evaluation Report (May 20 – July 19, 2019) · City of Fort Collins review and approval of the Hydrogeologic Evaluation Report (July 19, 2019 – August 2, 2019) · Initiate the ACM Report following agreement and approval of the Hydrogeologic Evaluation Report by the City of Fort Collins (August 2 – September 27, 2019) · City of Fort Collins review and approval of the ACM Report (September 27 – October 11, 2019) We estimate that the total project duration will be five months. Project Budget Our estimate of cost to complete the work described in the above proposal is $35,000. Work will be performed on a Time and Material basis under the Professional Services Agreement, Work Order between AECOM Technical Services, Inc. and the City of Fort Collins, Colorado effective March 29, 2018 and extended on February 28,2019 through February 27, 2020. The following Table 1 summarizes the estimated task costs for this proposal. City of Fort Collins Proposal 9 Use or disclosure of data contained on this sheet is subject to the restriction on the first page of this document. Table 1 – City of Fort Collins, Characterization of Contaminants of Concern at Larimer County Landfill Boundary and Off-Site and Assessment of Corrective Measures Task Description Labor Other Direct Costs Subtotal Task 1 Hydrogeologic Evaluation and Characterization of COCs at Landfill Boundary and Off-Site $18,124 $0 $18,124 Task 2 Preparation of ACM Report $16,876 $0 $16,876 Total $35,000 Additional Assumptions In addition to the assumptions included in the task descriptions, AECOM considered the following to develop our cost estimate: · We have included two project meetings to be held between the City of Fort Collins, CDPHE, and AECOM. The scheduling and scope of these meetings will be to discuss the findings from the draft hydrogeologic evaluation report and the draft ACM report. · We have not included responding to CDPHE or Larimer County comments to these reports in our cost estimate. Limitations The proposed scope of work proposed herein will be limited to a review of readily available and relevant information and information provided by the client, its agent, and regulatory agencies. Services performed by AECOM will be conducted in a manner consistent with the level of care and skill ordinarily exercised by members of the same profession currently practicing in the same locality under similar conditions. AECOM will not independently verify information provided by others. No expressed or implied representation or warranty is included or intended in our reports, except that our services were performed, within the limits prescribed by our client, with the customary thoroughness and competence of our profession. Therefore, AECOM will assume no liability for any loss resulting from errors or omissions arising from the use of inaccurate/incomplete information or misrepresentations made by others. References Trihydro. 2018. Site Assessment and Characterization report, Larimer County Landfill, 5887 South Taft Hill Road, Fort Collins, Colorado. July 13, 2018. site-specific human health and/or ecological risk assessment to develop site-specific exposure criteria. We can provide a separate scope and cost estimate if environmental risk assessment is appropriate for this project.