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�� LFR <br /> SFPP contacted LFR and NRC to request assistance with containment and recovery of the released ' <br /> product;and removal (e.g., excavation) of petroleum-affected surface gravel and shallow soils. , <br /> Based on visual observations made on July 24, 2006, it appeared that the product released from the <br /> back-pressure valve collected onto the containment pad supporting the valve assembly and spread <br /> on the ground surface across an irregular area of approximately 20- by 30-foot wide within the ' <br /> manifold area and an 8-by 30-foot wide section along the southeastern concrete firewall <br /> (Figure 2). <br /> Remedial Response Activities <br /> SFPP initiated remedial response activities to contain and recover the released transmix on July , <br /> 24, 2006. The objectives of the remedial response activities were to contain and recover released <br /> product and excavate product-affected soil to the extent practicable. Response activities included: <br /> • conducting air monitoring activities <br /> • mobilizing a spill response crew to contain and recover product from hand-dug sumps and ' <br /> ditches, deploy absorbent material, and transfer collected liquids to the onsite oil-water <br /> separator , <br /> • collecting product samples for fuel characterization <br /> • excavating visibly stained gravel and soil in the manifold area and placing the excavated , <br /> material into properly labeled and covered roll-off bins <br /> • waste characterization, transportation, and disposal of excavated soil , <br /> In addition to the above described activities, site monitoring well SP/M-9 was monitored for the <br /> presence of product using an oil-water interface probe. No product was observed in well SP/M-9 ' <br /> during response and remedial activities. Each of these activities is described in greater detail <br /> below. <br /> Air Monitoring <br /> Six air monitoring stations were established around the perimeter of and within the manifold area , <br /> to monitor VOC concentrations using a calibrated Photoionization Detector (PID) during the <br /> remedial response activities (Figure 3). Air monitoring measurements were performed at , <br /> approximately 30-minute intervals during the excavation activities and recorded on field data <br /> sheets. Additional air monitoring was performed within the excavation to determine appropriate <br /> personal protective equipment (PPE) measures. ' <br /> 2 ' <br />