Tim was the Preconstruction and Construction Manager responsible for the following:
- Preconstruction planning
- Scheduling
- Estimating
- Project reporting
- IDEM closure report
Clark-Floyd Landfill located at 14304 State Route 60 in Borden, IN 47106 is operated by Clark-Floyd Landfill, LLC (CFLF) who has authorized Pioneer Environmental & Engineering, LLC (Pioneer) to solicit bids for the remediation of sediment basin #1, and other support services. Sedimentation Basin #1 was originally designed as a dry basin with one of the early landfill permits and subsequent to the original design was retrofitted into a two-stage sediment basin with stage 2 of the basin outfitted with the discharge structure at the most southern end of the sediment basin.
This work plan is now the primary approach to remediate the sedimentation basin #1 in light of both summer weather and recent water quality testing data showing the water quality to meet IDEM water quality standards. Therefore, this plan has been developed to dredge the basin in steps and does not utilize the Aqua-Barrier cofferdam(s) as previously proposed. In the event a storm event reaches swale capacity, the team may introduce aqua-barrier to complete the project.
Pioneer ‘s construction services will manage the construction effort to remove the sediment from sedimentation basin #1. In order to support the sediment basin remediation, CFL staff has already prepared the basin for remediation by damming the central inlet and directing any stormwater to the north inlet. As a precaution during the north area Stage 1 dredging, CFL staff will excavate a swale from the north inlet along the inside of the northern berm and down the eastern berm whereby any water generated will be collected before making contact with the south stage one of the sediment basin. This excavated swale will aid in keeping the north stage one area relatively dry during potential rain events. It is Pioneer’s intention to conduct the dredging anticipated dry weather periods to minimize the management of water during the sediment remediation.
Pioneer will work with both CFLF manpower and/or EZ Construction to remediate the following areas of the sedimentation basin:
- Stage 2
- North stage one
- South stage one
CFL staff will drain stage 2 first by removing the pneumatic plug, and then excavating the sediment from this area of the basin to approximate design grades. A water sample will be obtained during the water evacuation of stage 2 at the Outfall of the basin’s outlet structure. The sample will be tested per IDEM’s required parameter list and the results will be included with the final certification report. Sediment excavation will be visually verified for removal of any impacted sediments, and photographs obtained, and grab samples will be taken from side walls and floor bottom (total of 3 samples) and sent to Pace Analytical in Indianapolis, IN for one day turnaround analysis of arsenic, cadmium, barium, chromium, lead, mercury, selenium, silver, iron, manganese, magnesium, copper, zinc, nickel, chloride, and benzene per IDEM Uncontaminated Soil Policy document (Waste-0064-NPD). In the event a sample tests above the accepted limit, an additional thickness of material will be excavated and another sample taken until sample results meet the required criteria. After Stage 2 has been successfully remediated, the team will initiate work on north stage 1 zone.
Prior to the remediation of the sediment basin #1 north stage, CFLF staff will cut-off flow to this basin by damming off the north inlet. The inlet channels leading to the central and north inlets were previously excavated and impacted sediments removed during early March 2019 following IDEM’s prohibition of intentionally utilizing the basin to contain impacted water. Since that time the drainage swales conveying stormwater to the central and north inlets were maintained to prevent the conveyance of leachate outbreaks from reaching the basin.
Recently, the central inlet was completely dammed-off with compacted soils and any stormwater directed to the north inlet. CFL staff cleaned-out the central channel prior to damming off.
CFLF staff will use the inlet swale to keep north inlet water from entering the north area of Stage 1 portion of the sediment basin during the remediation work in this area. Collected water will be directed to the Stage 2 portion of the basin. Ideally this part of the process will be coordinated with weather forecasts to time this work during periods when rain is not part of the forecast to minimize the diversion of stormwater.
Excavation or dredging of the Stage 1 north area will be conducted until approximate design grades have been achieved for removal of any impacted sediments, and photographs obtained, and grab samples will be taken from side walls and floor bottom (total of 3 samples) and sent to Pace Analytical in Indianapolis, IN for one day turnaround analysis of arsenic, cadmium, barium, chromium, lead, mercury, selenium, silver, iron, manganese, magnesium, copper, zinc, nickel, chloride, and benzene per IDEM Uncontaminated Soil Policy document (Waste-0064-NPD). In the event a sample tests above the accepted limit, an additional thickness of material will be excavated and another sample taken until sample results meet the required criteria. After Stage 1 north has been successfully remediated, the team will initiate work on south stage 1 zone. Once sediment basin north section remediation has been completed and sample results demonstrate soil standard compliance, the inlet channel(s) will be returned to service. Currently, CFLF staff have dammed the Central Inlet channel to provide better stormwater control to just one inlet, the North Inlet.
Subsequently to the successful completion of Stage 1 north, Pioneer will work with both CFLF manpower and/or EZ Construction to remediate the stage 1 south zone, The CFL staff will have drained out stage 2 first and dispose of the stormwater. Sediment will be removed from stage 1 south side walls and bottom to approximate design grades of any impacted sediments and acquiring photographs to document the successful removal. Samples will be taken from side walls and floor bottom (total of 3 samples) and sent to Pace Analytical in Indianapolis, IN for one day turnaround analysis of arsenic, cadmium, barium, chromium, lead, mercury, selenium, silver, iron, manganese, magnesium, copper, zinc, nickel, chloride, and benzene per IDEM Uncontaminated Soil Policy document (Waste-0064-NPD). In the event a sample tests above the accepted limit, an additional thickness of material will be excavated and another sample taken until sample results meet the required criteria. It needs to be noted that any water collected in stage 1 south during sediment removal will be managed as leachate.
Transport of excavated sediments will either occur by the EZ Construction utilizing over the road triaxle dump trucks or similar CFLF approved trucks or by off-road ADT’s. The on-road traffic route is shown on the map included in Appendix A. It needs to be noted that some of the proposed test parameters may be naturally occurring and it may be necessary to compare results to background, and a separate testing approach can be provided by Cornerstone Environmental Group which discusses the background sampling and testing of the basin subgrade versus the actual sediments been deposited into the basin. Considerations must also be made for groundwater elevations versus the basin bottom grades.
While the South portion of stage 1 is being remediated, any stormwater collected in the north inlet may require conveyance to the Stage 2 portion of the basin for discharge through the existing outlet structure of the basin. While releasing the north inlet stormwater, a water sample will be taken to verify stormwater discharge is in compliance with discharge standards. This may or may not occur depending upon the amount of rainfall during the remediation period of the south portion of stage 1. After completion of sediment basin remediation, disturbed areas around the basin will be graded and dressed for seed and mulch.
Following completion of the remediation of the entire basin, a certification report will be compiled with the testing results (sediment and water quality), photographs and survey data will be submitted to IDEM.