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� u Field Practices and Procedures Page 2 samplers will be steam cleaned between each boring to reduce the possibility of cross contamination. Steam cleaning effluent will be contained in 55-gallon drums and temporarily stored on site. The disposal of the.effluent will be the responsibility of the client. Drill cuttings generated during the drilling procedure will be stockpiled on site. Stockpiled drill cuttings will be placed on and covered with plastic sheeting. The stockpiled soil is typically characterized by,collecting and analyzing composite samples from the stockpile. Stratus Environmental will recommend an appropriate method for disposition of the cuttings based on the analytical.results. The client will be responsible for disposal of the drill cuttings. Soil Sample Collection During drilling, soil samples will be collected in cleaned brass, two by six inch tubes. The tubes will be set in an 18-inch-long split-barrel sampler. The sampler will be conveyed to bottom of the boreholeattached to a wire-line hammer device on the drill rig. When possible, the split-barrel sampler will ;be driven its entire length, either hydraulically or by repeated pounding a 140-pound:hammer using a 30-inch drop. The number of drops (blows) used to drive the sampler will be recorded on the boring log. The sampler will be extracted from the borehole, and the tubes containing the soil samples will be removed. Upon removal,-the ends of the lowermost tube will be sealed with Teflon sheets and plastic caps. Soil.samples for chemical analysis will be labeled, placed on ice, and delivered to a state-certified analytical laboratory, along with the appropriate chain-of-custody documentation. Soil Classification As the samples are obtained in the field, .they will be classified by the field geologist in accordance with the Unified Soil Classification System. Representative portions of the samples will be retained for further examination and for verification of the field classification. Logs of the borings indicating the depth.and identification of the various strata and pertinent information regarding the method of maintaining and advancing the borehole will be prepared. Soil Sample Screening Soil samples selected for chemical analysis will be determined from a head-space analysis using a PID or an FID. The soil ,will be placed in a Ziploc® bag, sealed, and allowed to reach ambient temperature, at which time the PID probe will be inserted into the Ziploc' bag. The total volatile hydrocarbons present are detected by the PID and reported in parts per million by volume (ppmv). The PID will be calibrated to an isobutylene standard. MAField Practices\Field Practices and Procedures-revised 07-2004.doe