ARCHIVED REPORTS_XR0011978 - Laserfiche WebLink

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intervals. A consultinggeologist will oversee g gr a see a dnlhng company steam clean augers and samplers between each boring to reduce the possibility of cross contamination. Steam cleaning effluent will be contained in 55-gallon drums and temporarily stored onsite. The disposal of the effluent will be the responsibility of ARCO. Soil Classification Samples will be classified onsite 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 will be prepared. Exploratory boring logs and well constriction details will be prepared for the final written report. 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 Ziploco-type resealable plastic bag and allowed to reach ambient temperature, at which time the PID probe will be inserted into the bag. The total volatile hydrocarbons present are detected by the PID and reported in parts per million by volume (ppmv). A PID is calibrated by entering the known concentration (in ppmv) of a containerized gas (typically isobutylene) into the display function of the PID machine. The containerized gas is released through an inert (plastic) tube into the sensory receiver of the PID. The PID normalizes its volatile organic compounds (VOC) detection sensors to match the known concentration of the gas being input into the PID machine. Sail Sample Collection During drilling, soil samples will be collected in clean brass, two by six inch tubes. The tubes will be set in an 1$-inch-long split-barrel sampler. The sampler will be conveyed to the bottom of the borehole attached 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 repeatedly 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. Label information includes a unique sample identification number, job identification number, date, and time. After labeling, all soil and water samples are placed in a ZiploOl type bag and placed in an ice chest cooled to approximately 4° C_ Upon arriving at Appendix A Page 2