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_ _ _ - 9. A' LEEOSHILL•HERKENHOFF,INC. rods inserted down the center of the hollow-stem augers will be used to collect the samples. The sample will be a modified (2.5-inch o.d.) split- spoon sampler equipped with clean brass or stainless steel tubes. The sampler will be driven 18 inches into the undisturbed ground beyond the tip of the auger by a 140-pound hammer having a 30-inch drop. The sample will then be withdrawn from the auger and tubes removed. Once removed, all samp;es will be wrapped, carefully marked and identi- fied. The sample will then be carefully preserved for analysis in accordance with EPA and State of California protocol. Before transport to the laboratory, samples will be cooled to 4 degrees C at the site and maintained at that temperature until they are received at the laboratory. Prior to transport, the sample will be logged onto a chain-of-custody form identifying the project number, sample type, container type, sample identification, sampler and date. The samples will be delivered to the laboratory, where a laboratory representative will accept them by. signing the chain-of-custody form. The samples will then be placed in a refrigerator until they are extracted and analyzed prior to their expiration date. The split-spoon sampler will be brushed and washed with distilled water between each sampling interval. All sample tube inserts and drilling ghly cleaned with high-pressure, hot water prior equipment will be thorou to use. The boreholes will be backfilled with a sand-cement grout mixture immediately after the samples are obtained. A photoionization detector (PID), or equivalent, will be used to field con in the sail . Each sample will monitor the volatile hydrocarbon co be monitored to aid the field engineer in determining the appropriate P1D is not intended to replace the maximum depth of the boring. The proposed analytical testing. All samples will be obtained under the supervision of a professional boring lag will be kept at all times engineer or geologist. A detailed noting: (1) sail types encountered with depth (Unified Soil Classification System); and (2) moisture conditions. The location, depth, and time of collection for each sample will also be carefully noted on the log. Also, a field notebook will be maintained to document daily drilling progress, sampling, site personnel , and sample shipment. Representative photographs will be taken as the work progresses. 6 , j