RBCA SITE CHARACTERIZATION, purchase REMEDIATION AND CLOSURE
Client: Idaho Transportation Department
Summit Environmental, Inc. personnel performed a Risk Based Corrective Action (RBCA) for a petroleum release at the Idaho Transportation Department Cambridge Maintenance Yard. During the decommissioning of three underground storage tanks (USTs), petroleum contamination was found. Summit Environmental staff conducted petroleum release characterization, remediation and monitoring, targeting a Tier 0 closure. The possibility of a Tier 1 closure required evaluating potential exposure scenarios.
Summit Environmental staff reviewed UST Monthly Inventory Control records to estimate the volume of released product. Samples were collected from soil borings and shallow test pits and analyzed for the petroleum contaminants of concern, as required by the Idaho RBCA Program, to determine the extent of the petroleum contaminated soil. Three-dimensional computer modeling was conducted to estimate the extent of excavations required for a Tier 0 site closure. An off-site land treatment site was constructed for the remediation of petroleum-contaminated soils. Summit Environmental conducted quarterly groundwater monitoring and land treatment site sampling to determine site cleanup effectiveness and the progress of soil remediation.