REMOVAL_1986 - Laserfiche WebLink

Home Browse Search

be taken with a driven-tube type sampler, capped and sealed with inert materials (see below) to minimize loss of volatiles. In instances where samples cannot be safely obtained using the above procedures, the following alternative method my be used. Immediately upon tank removal , a backhoe bucket will rapidly bring the soil to the surface. Once the soil has been brought to the surface, the technician shall quickly scrape off the top three inches of soil and the soil tube shall be driven into the soil by a suitable device such that no headspace is present anywhere in the tube. All piping must be removed and soil samples taken every 20 lineal feet. Soil samples from under piping will be collected in soil cylinders and treated as described below. In instances where samples are to be taken at a soil/water interface, the driven-tube type sampler will be used. After the sample has been taken, aluminum foil will be placed around each end of the soil cylinder, capped with polyethylene lids, taped, labeled and placed into an ice chest containing dry ice and kept frozen until their delivery to the laboratory. In instances where the above procedure is inappropriate - i. e. semi-solid samples - glass containers with teflon seals & screw caps should be used. Maintain samples in glass containers at 4 Deg. C with blue ice to avoid breaking. a. shipping - If shipping with dry ice presents Department of Transportation problems, Blue Ice may have to be substituted. D. Water Samples - If water is present in the tank pit, soil and water samples will be taken. The soil samples will be taken by the methods described above (soil & water interface) , at the tank ends. Before sampling, the water shall be observed for signs of floating product, and the technician shall record these observations in the field notebook. The pit may be pumped out and allowed to refill before sampling. Water pumped out of the pit shall be handled correctly - i. e. stored in drums or pumper truck for disposal . This water is not to be discharged into a storm drain without prior approval from the Regional Board. Water samples are to be taken which are representative of the water in the pit. Usually one sample is enough, but more samples may be necessary to accurately characterize the water. Samples may be taken at the edge of the pit in one of two ways ; 1) manually by holding a suitable glass container (prepared by the lab) under the surface 12 to 18 inches (a surface ' sample may also be required) , or preferably 2 ) by using 2