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Union Ice Plant Phase I & II Remedial Investigation Plan Page: 5 waste if deemed necessary upon receipt of laboratory results . Disposal will be the responsibility of the client unless other arrangements have been made. All soil and ground water samples will be properly labeled with date collected project number, sample coordinator, and sample identification . All samples will be identified with job number-year-borehole- depth/monitoring well-hour. Field records will document the above information and other significant data such as names of on-site personnel, sampling methods , date and time of sampling, the number of well volumes removed before sampling, preservatives added (if any) , and any filtration performed on samples. The samples will be refrigerated immediately for delivery to the laboratory and will under no circumstances be opened by anyone other than laboratory personnel . Chain of Custody records will be maintained at all times (Figure 7) . 3.4 Soil Sampling All soil sampling equipment will be thoroughly steam- cleaned before and between sampling to prevent cross contamination . Relatively undisturbed soil samples will be taken at intervals of not more than 5 feet in order to evaluate the subsurface materials , however this sampling interval may be waived in saturated sands in which sample recovery is not possible. During the use of a rotary rig samples will not be taken through the gravel zone but will resume at 5 foot intervals when a hollow stem flight auger drilling rig can be used . The soil samples will be taken using a California Modified Split Spoon sampler with brass liners . The sampler will be driven by a 140 pound hammer repeatedly falling 30 inches . The blow counts necessary to drive the sampler will be recorded for each 6-inch interval to help evaluate the consistencies of the materials . The laboratory samples will not have head space and