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SEP-11-97 THU 02:40 PM P, 03/09 <br /> Ms. Mary Meays <br /> September 11, 1997 <br /> Page 2 <br /> Destruction of Soil Borings <br /> The soil boring will be backfilled with neat cement grout mixed at a ratio of one 94-pound sack of <br /> Portland cement to 5 to 10 gallons of potable water. The cement will be tremmicd into the boring using <br /> the hollow stem augers. As cement is added,the augers will be raised and removed. <br /> Soil Classification <br /> As the samples are obtained in the field,they are classified by the field geologist in accordance with the <br /> Unified Soil Classification System. Representative portions of the samples are then retained for further <br /> examination and for verification of die field classification. Logs of the borings indicating the depth and <br /> identification of the various strata, the N value, and pertinent information regarding the method of <br /> maintaining and advancing the borehole are prepared. <br /> $0 Sample Screening <br /> After the soil samples in ZiplocV type bags have been brought to ambient temperature, the headspace <br /> vapors in the bag are screened with either a photoionization detector equipped with a 10.2 cV lamp or a <br /> flame ionization detector(FID). The corner of the bag is opened and the detector probe immediately <br /> placed within the headspace. The highest observed reading is recorded. <br /> Soil Cuttings From Drilling Operations <br /> Soil generated during drilling operations will be stockpiled on-site. The stockpile is typically set on <br /> asphalt and covered by plastic sheeting in a manner to prevemt rain water from coming in contact with <br /> the soil. If no asphalt is available the soil is placed on plastic sheeting and covered in the above <br /> method. The soil will remain on-site until the proper method for disposal is assessed. <br /> QUALITY ASSURANCE PLAN <br /> General Sample Collection and Handling Procedures <br /> Proper collection and handling are essential to ensure the quality of a sample. Each sample is collected <br /> in a suitable container, preserved correctly for the intended analysis, and stored prior to analysis for no <br /> longer than the maximum allowable holding time_ Details on the procedures for collection and handling <br /> of samples used on this project can be found in this section. <br /> Soil and Water Sample Labeline and Preservation <br /> Label information includes a unique sample identification number,job identification number, date, and <br /> time After labeling all soil and water samples are placed in a Ziploc�g type bag and placed in a ice <br /> chest cooled to 4° Celsius. Upon arriving at Delta's office the samples are transferred to a locked <br /> refrigerator cooled to approximately 4° Celsius. Chemical preservation is controlled by the required <br /> analysis and is noted on the chain of custody form. <br /> Upon recovery, the sample container is sealed to m*immize the potential of volatilization and <br /> cross-contamination prior to chemical analysis. Soil sampling tubes are typically closed at each end <br />