Laserfiche WebLink
These combined limits total approximately 4,700 in-place cubic yards or 7,000 tons of <br /> soil. The estimated cost to implement the conceptual excavation totaled approximately <br /> $750,000 which includes design, permitting, excavation, dewatering, soil sampling, soil <br /> transport and disposal (approximately $362,000), backfill, compaction, and reporting. <br /> Again, this conceptual excavation assumes impeding site features have been removed as <br /> part of site improvement work and not specifically for remediation. <br /> Well decommissioning to accommodate excavation and subsequent well replacement is <br /> estimated to cost approximately$100,000. <br /> Groundwater monitoring at the terminal costs approximately $35,000 annually. <br /> Groundwater monitoring would continue for at least 5 years considering one year for <br /> excavation implementation, four years of post-remediation monitoring. Therefore, the <br /> 5-year life-cycle groundwater monitoring cost would be approximately $175,000. <br /> Closure request and well decommissioning costs are estimated at $97,000. The total <br /> cost-to-closure for excavation sums to$1,122,000. <br /> 5.3.3.3 RECOMMENDATION <br /> Excavation is a viable active remedial option, and the most cost-effective active remedial <br /> option considered in this CAP if performed in conjunction with future site <br /> improvements. Excavation is not a viable approach if not done in conjunction with site <br /> improvements. The cost of excavation is considered excessive and is not justified based <br /> on any risk to receptors and in consideration of the on-going site use as a bulk fuel <br /> terminal. <br /> Only site improvement work would potentially cause completion of exposure pathways. <br /> Terminal staff and subcontracted construction workers are required to obtain specific <br /> permits prior to conducting work in the loading rack and bermed tank areas. <br /> Construction workers entering these areas are trained in safety practices specifically <br /> designed to avoid exposure to soil contamination. Measures are in-place,equivalent to a <br /> soil management plan, for handling impacted soils should any future site improvement <br /> work occur. CRA does recommend very limited and cost-controlled excavation of any <br /> substantially impacted soils encountered during any site improvement work for the <br /> purpose of mitigating exposure. <br /> 241729(33) 21 CONESTOGA-ROVERS&ASSOCIATES <br />