Tank Closures: Removal and In-Place
Creek Run has extensive experience with closing underground storage tank (UST) systems, both closure-by-removal and closure-in-place. Once a thorough understanding of UST system components is acquired, Creek Run will prepare pre-closure notification documents and forward them to the appropriate regulatory agencies. During the notification waiting period, Creek Run will determine client expectations with regard to disposal of any impacted materials encountered, prepare detailed bid specifications, and solicit quotes from qualified excavation subcontractors. Following subcontractor selection, the work will be scheduled and performed within the time frame designated by the client.
All UST closure operations are conducted by OSHA 40-hour HAZWOPER-trained subcontractors under the direct supervision of experienced Creek Run personnel that are certified in UST closures. Closure-by-removal typically begins with removal of pavement and soil above the tanks. The tanks are then ventilated, residual product and sludge are removed, and the interior of the tanks are cleaned prior to proper off-site disposal. Product lines, vent lines, and associated piping are removed, cleaned, and properly disposed.
Following tank and line removal, an excavation zone assessment is conducted. Soil and groundwater samples are collected from appropriate locations in accordance with applicable state guidelines, screened for organic vapors in the field using a photoionization detector (PID) or flame ionization detector (FID) and preserved for laboratory analysis. Field observations and recommendations regarding the presence or absence of impacted soil or groundwater are discussed with the client prior to excavation backfilling, compacting, and paving.
Within 30 days of UST removal, Creek Run will prepare a UST Closure and Site Assessment Report. The report will provide all information required by the applicable regulatory agency, including laboratory analytical results, disposal documents, and conclusions regarding the presence or absence of impacted materials.
UST closure-in-place requires pre-approval by the applicable regulatory agency. Pre-approval is obtained by submitting a plan to the state that outlines the closure-in-place scope of work. Upon receipt of regulatory approval, Creek Run will prepare detailed specifications and acquire bids from several subcontractors to remove accessible piping, fill the UST(s) with inert material (usually sand or a cement/bentonite slurry), and pave or re-seed any surface openings. Creek Run will oversee soil boring advancement and soil and ground water sample collection. A closure report documenting laboratory analytical results of soil and groundwater samples collected from borings adjacent to the UST area, an explanation why the USTs could not be closed-by-removal, and a description of specific closure-in-place procedures and materials is required.