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HomeMy WebLinkAboutDSHW-2024-008495PART 1 – GENERAL REQUIREMENTS 1.1Purpose The purpose of this plan is to describe the quality assurance procedures to be utilized during the construction of the final soil cover atthe North Pointe Solid Waste Construction and Demolition Landfill (Landfill). The Landfill will be closed in a series of Stages with the first Stage being complete in the summer of 2024. The primary goals of the quality assurance program are to: Determine if proper construction techniques, materials, and procedures are used. Determine if the intent of the construction documents is met. Identify construction problems and provide a method for resolution of any problem. Document the construction activities. Upon the completion of each final cover Stage construction; a final construction documentation package will be prepared and submitted to the State of Utah Division of Waste Management and Radiation Control (UDWMRC) for approval. 1.2Document Format The Quality Assurance Plan is divided into three sections to identify; 1) the general information and personnel associated with the project; 2) the detailed requirements of the quality assurance program; and 3) the documentation and record keeping associated with the construction. 1.3Definitions The following are definitions that are utilized in this document and without definitions may be taken out of context: As-Built Drawings – Drawings recording the constructed dimensions, and details. ASTM – American Society for Testing and Materials. Construction Team – The North Pointe staff responsible for the placement of cover soils. Engineer – The person or firm (IGES Inc.) responsible for the development of the Quality Assurance Plan. Landfill Manager – Owner’s representative on site (TBD), who is responsible for all construction activities. Nonconformance – A deficiency in characteristic, documentation, or procedure that renders the quality of an item or activity unacceptable or indeterminate. Examples of nonconformances include, but are not limited to, physical defects, test failures, or inadequate documentation. Owner – North Pointe Solid Waste Special Service District (North Pointe). Operations Supervisor – Owner’s representative on site (TBD), who is responsible for coordination of final cover construction. Project Documents – Construction Drawings and this quality assurance plan. Quality Assurance/Quality Control – A planned and systematic pattern of procedures and documentation designed to provide adequate confidence that materials or services meet contractual and/or regulatory requirements, and that these materials will perform satisfactorily in service. Quality Assurance/Quality Control will be performed by the Owner. Quality Assurance Inspector – The Quality Assurance Inspector for the final cover placement will be the Landfill Manager. Quality Assurance Manager – Not utilized for this project. Quality Control Inspector – The Quality Control Inspector for the final cover placement will be the Lead Operator. Quality Control Manager – Not utilized for this project. Quality Assurance Plan - A planned series of observations and tests designed to provide adequate confidence that materials and services meet contractual and/or regulatory requirements. State of Utah – State of Utah Division of Waste Management and Radiation Control (DWMRC) is the agency responsible for permitting landfills in Utah. 1.4Meetings Preconstruction and postconstruction meetings will be held in association with each Stage of the final cover construction at the Landfill. The meetings are intended to facilitate the cover construction and minimize the potential for errors. The Landfill Manager will conduct and document all meetings. A.Preconstruction Meeting – A preconstruction meeting will be held with representatives from the Owner, DWMRC staff, the Engineer, and the Construction Team. The “for construction” documents, quality assurance plan, testing requirements, reporting procedures, and overall project responsibilities of all parties will be reviewed at the meeting. B.Progress Meetings – Progress meetings are not anticipated. Progress meetings will be scheduled as necessary. If a progress meeting is scheduled, representatives from the Owner, DWMRC staff, the Engineer, and Construction Team will attend. The purpose of the progress meetings will be to discuss progress, identify problems (and corrective actions), review test data, and coordinate work activities including testing. C.Postconstruction Meeting – A postconstruction meeting will be held with representatives from the Owner, DWMRC staff, the Engineer, and the Construction Team. The final cover construction work and documentation will be reviewed and compared to the Quality Assurance Plan for completeness. If adequate documentation is not included, additional test pits may need to be excavated to demonstrate cover soil thickness. 1.5Responsibilities of Personnel A. Responsibilities of the Landfill Manager – The Landfill Manager is the primary Owner’s representative on the project. The Landfill Manager defines the overall project scope and is responsible for the implementation of all construction related activities. The Landfill Manager is the point of contact for all communications. B.Responsibilities of the Quality Assurance Inspector – The Landfill Manager will function as the Quality Assurance Inspector. C.Responsibilities of the Quality Assurance Manager – Not utilized for this project. D.Responsibilities of the Quality Control Inspector – The Quality Control Inspector will be a representative of the Construction Team responsible for the day-to-day Quality Control activities performed on-site. E.Responsibilities of the Quality Control Manager – Not utilized for this project. F.Responsibilities of Engineer – The engineer is the person or firm (IGES) responsible for the development of the quality assurance plan and will be available for clarification of the plan during construction if necessary. G.Responsibilities of UDWMRC – The UDWMRC is the permitting agency responsible for the oversight of all landfilling activity in the State. UDWMRC is responsible to review and approve the quality assurance plan developed by the engineer. The UDWMRC will be available for clarification of the approved plan or State related concerns if necessary.1.6Construction Documents A.Construction Drawings – Appendix A contains the plans for the firstStage of the final cover construction at the Landfill. A preconstruction survey of the existing landfill cover (in the area to be closed) may be utilized to document the preconstruction grade and serve as a basis for a post construction survey utilized to demonstrate cover thickness. Alternatively, Landfill personnel may elect to install grading stakes to indicate required cover thickness. B.Specifications – The only project specifications for the cover construction is presented in Part 2. C.Forms – The forms required for use on the first Stage of the final cover project are included in Appendix B. PART 2 – CONSTRUCTION QUALITY ASSURANCE 2.1Introduction This section describes the monitoring and testing that will be performed to assure that the final cover construction meets the specified requirements. 2.2Material Evaluation A.Testing – Soil sources will be identified prior to placement. Gradation testing for the final cover soil will be performed at one gradation test per 10,000 cubic yards of final cover soil. No additional testing of the soils to be utilized in the construction will be required other than to document that a minimum of 34 inches of soil has been placed. The soil to be utilized for the first Stage of the final cover at the Landfill will come from excavated soils. B.Test Fill – No test fill will be required for this project. 2.3Construction Testing A.Test Procedures – Soil will be tested according to the tests identified in Table 1. B.Test Frequencies – Soil will be tested according to the minimum frequency identified in Table 1. 2.4Monitoring Requirements The monitoring requirements will include verification of final cover thickness. 2.5Documentation and Control of Nonconformance 2.5.1Observation of Nonconformance Whenever a nonconformance (cover thickness less than 34”) is discovered the Landfill Manager will either document the location of the nonconformance (to be corrected at a future date) or have the Construction Team correct the cover thickness nonconformance as they are discovered. 2.5.2Determining Extent of Nonconformance Whenever a nonconformance is discovered or observed in the construction process, product, documentation, or elsewhere, the Landfill Manager will determine the extent of the nonconformance. The extent of the deficiency may be determined by additional sampling, testing, observations, review of records, or any other means deemed appropriate. 2.5.3Documenting Nonconformance All nonconformances (observed but not corrected) will be documented in writing on a Problem Identification / Corrective Action form. The documentation will occur immediately upon determining the extent of the nonconformance. 2.5.4Corrective Action Since the only criterial item required for final cover construction documentation is cover soil gradation and final cover thickness; the prescribed corrective action is to add additional soil until a minimum of 34 inches of soil cover is documented. For those nonconformances not relating to cover thickness (drainage features), the engineer will be asked to review the proposed corrective action. The UDWMRC will be notified of all corrective actions (other than soil thickness) prior to implementation. 2.5.5Verification of Corrective Actions The Engineer and DWMRC personnel will verify all corrective actions. The verification will be accomplished by site observations, depth testing (test pits), and photographs. Verification of corrective actions will be made during the postconstruction meeting. Written documentation of the corrective measures will be made by the Engineer on the second page of the Problem Identification / Corrective Action form. 2.6Construction Surveys A pre and post-construction survey may be performed by the Owner to document final cover geometry and thickness. Test pits will be excavated to confirm survey data. 2.7Revegetation The revegetation requirements for the final cover soils are presented in the Construction Drawings. The Owner mayelect to coordinate revegetation efforts with local agricultural personnel or Utah State University Extension office personnel to select a different seed mix or revegetation efforts if initial revegetation is not adequately robust.The following seed mix is anticipated to be utilized for the revegetation of the landfill slopes:Reclamation Seed Mix(Per Acre)Pounds PLSFourwing saltbush10Wyoming big sagebrush0.75Alksli sacabon1Blue grama2.5Bluebunch wheatgrass14.25Streambank wheatgrass13Smooth brome15.5Intermediate wheatgrass10Sandberg blusgrass2Sheep fescue3Slender wheatgrass11Western wheatgrass17During the regrading of the landfill slopes, the orientation of the dozer resulted in grouser marks that are perpendicular to the slope. Those ridges left on the slope by the equipment tracks will also minimize slope erosion by providing interruption to the surface water flow. A perimeter road will be established at the top of the western slope once the final slope and soil thickness are documented and no new soil is required to be placed on the side slope. The perimeter road will prohibit water from flowing from the top of the landfill down the western slope by directing the water laterally away from the final cover. PART 3 – DOCUMENTATION 3.1Recordkeeping The quality assurance plan relies on the observations, testing, and associated documentation of all construction activities. The documentation activities will be performed by the Landfill Manager. A.Daily Record of Construction Progress – Due to the anticipated method and rate of construction; daily construction reports will not be utilized. Soil will be moved by the Construction Team and potentially stockpiled on the existing landfill for several days/weeks before being graded down the landfill slopes. Once enough material has been stockpiled; the landfill operators will grade the stockpiled material out to form the minimum 34-inch thick final cover. B.Weekly/Monthly Record of Construction Progress – Since the final cover construction will be done at a relatively slow pace; the Landfill Manager will fill out weekly or monthly construction record (during the weeks or months that the final soil cover materials are placed) detailing the estimated amount of soil hauled and a summary of any testing performed. Date, project name Weather information A description of all ongoing construction for the week/month Areas of nonconformance/corrective actions, if any Record of any site visitors Signature of Landfill Manager C.Problem Identification / Corrective Action – The problem identification / corrective action form is to be utilized to identify and document portions of the construction that do not meet project specifications. The problem identification / corrective action form also documents the corrective action associated with every problem identified during construction. The Landfill Manager and Engineer will be responsible for filling out the Problem Identification / Corrective Action form. D.Photographs Construction activities will be photographed. Photographs include any significant problems encountered and corrective actions, and document construction progress. The photographs will be identified by location, date, and a brief narrative of the subject of the photograph. The Landfill Manager will be responsible for taking and cataloging construction photographs. 3.2Final Construction Report At the completion of each Stage of the final cover construction, the Landfill Manager will submit a final construction documentation to the Engineer. The Engineer will review the construction documentation, perform a post-construction site visit and prepare a construction report that will document that the final cover has been constructed in compliance with the construction drawings and specifications. At a minimum, the final construction report will contain: A summary of major construction activities A summary of field tests Sampling and testing locations As-built record drawings (if prepared) Photographs of the final cover construction Once the Engineer finalizes the construction report that deems that the documentation is complete and that the work product has met the intent of the design, he will issue a letter to the DWMRC. The letter to the DWMRC will contain a statement of compliance with the construction drawings and specifications signed and stamped by a professional engineer registered in Utah. The post construction as-built survey drawing (if utilized) will present the location of all tests performed associated with the cover construction. The post construction survey (if utilized) will be included in the final construction report and submitted to the UDWMRC. TABLE 1 Tests Test Method Material Evaluation Acceptable Range Standard Proctor ASTM D 698 Not Required - Grain Size ASTM D 422 Every 10,000 yd3 - Liquid and Plastic Limits (Atterberg) ASTM D 4318 Not Required - In-situ Density using Nuclear Gauge ASTM D 2922 Not Required - Verification of Proper Thickness of Cover1 - Pre-Construction/Post Construction GPS Survey* 24-inch minimum *Cover thickness may be documented by GPS survey or confirmed by the excavation of test pits at one test pit per acre of final cover. Landfill manager may require more tests based on test results and/or field conditions.