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Remedial Action Completion Report June 2008 Remediation of Soils and Dry Sediments at RVAAP 08-11 (LLs 1-4) Page 3-10 will be removed and a Notice of Termination (NOT) will be submitted to the Ohio EPA only after vegetation is established and disturbed areas are stabilized. 3.3.5 Clearing and Grubbing Shaw cleared and grubbed only vegetation that impeded or interfered with the safe and effective implementation of the design and requirements of the site work. The removed vegetation was consolidated at each load line and was placed at points nearest the excavation where it could not impact the remediation activities. 3.3.6 Source of Water Usage Potable water and water for onsite construction use, including equipment decontamination water, was supplied by Shaw. Water for on site construction use was brought on site and stored in a designated temporary on-site storage tank. The tank was appropriately labeled as “WATER FOR CONSTRUCTION USE ONLY” to prevent inadvertent use. The source of the construction water was the Newton Falls Water Treatment Facility. Analytical data was provided for the water source and included analysis for the following; • TCL VOCs • TCL SVOCs • TCL pesticides • PCBs • explosives • propellants (nitroglycerine, nitroguanidine and nitrocellulose) • filtered TAL metals Approval to utilize the water source was received from both the USACE and Ohio EPA project managers in accordance with Section 4.3.2.2.4 of the FSAP (SAIC 2001). A summary of analytical results for the Newton Falls Water Treatment Facility are presented in the data tables (Table B-2) in Appendix B. The Kemron laboratory report and associated evaluation report for water source are presented in Appendix D in the electronic attachment to this RACR. 3.3.7 Dust Management Control measures were necessary to prevent airborne releases of dust during earth moving activities. The primary dust control measure was the application of a water spray to exposed soils. Shaw supplied all water using a water wagon to contain water for dust suppression. Water was sprayed on temporary soil piles, excavations, and re-vegetation areas. Only potable water obtained from the Newton Falls Water Treatment Facility was used for dust control. Water was only applied to prevent dust emissions as best as possible and no runoff or areas of standing water were created. All contaminated soils were covered during storage, wetted as required, and covered during transport to prevent windblown conditions. Work areas that showed potential release of dust were reported to the Shaw Field Superintendent, who ensured that the water was sprayed on the *** FINAL***
Remedial Action Completion Report June 2008 Remediation of Soils and Dry Sediments at RVAAP 08-11 (LLs 1-4) Page 3-11 area to eliminate the potential for dust problems. If necessary, the work area was reduced or work was stopped until the dust was controlled. Visual and real-time monitoring for dust and COCs was performed in accordance with the requirements of Section 8.0 of the SHERP (Shaw 2004e). Real-time monitoring for dust was performed using Mini-Ram ® dust monitors that were strategically placed down-wind from the areas of excavation. Time-integrated air sampling was performed during activities at locations identified in the SHERP Addendum (Shaw 2007d) that had the potential to expose workers to concentrations that may exceed established permissible exposure limits and threshold limit values (PEL/TLV) for target compounds. 3.3.8 Protection of Existing Monitoring Wells Prior to commencing construction activities at each load line, Shaw identified existing monitoring wells that had the potential to be impacted by its construction activities. Construction fencing was placed around the monitoring well locations to provide a visual reminder to workers and vehicle and equipment operators to maintain a safe working distance to prevent damage to the wells. 3.4 EXCAVATION The duration of excavation activities was from August to November 2007 and proceeded as identified in the RAWP (Shaw 2007b). A total of 11,241 tons of contaminated soil and dry sediments were removed from 119 locations and disposed off-site as part of the Shaw remedial action at LLs 1-4. A total of 1,752 tons and 9,489 tons of soil and sediment were disposed as PCB soil and non-hazardous soil, respectively. The maximum depth of excavation was to 3 feet bgs; however, most excavations were typically to 2 feet bgs. The quantities of soils removed per load line are included in Table 3-1. Construction As-Built Drawings are presented in Appendix A and include the areas of soil and dry sediment removal at LLs 1-4. Table 3-1 Excavated Soil Volumes at Load Lines 1 - 4 Load Line PCB Soils (Tons) Non-Hazardous Soils (Tons) 1 539 3126 2 320 2617 3 893 2538 4 0 1208 Totals: 1752 9489 Notes: PCB – Polychlorinated biphenyl *** FINAL***
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