ARCHIVED REPORTS_XR0007506 CASE 1

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FIELD PROCEDURES The following section describes field procedures that were completed by Delta personnel in the performance of the tasks involved with this project. 1.0 HEALTH AND SAFETY PLAN Fieldwork performed by Delta and subcontractors at the site was conducted according to guidelines established in a Site Health and Safety Plan (SHSP). The SHSP is a document describes the hazards that may be encountered in the field and specifies protective equipment, work procedures, and emergency information. A copy of the SHSP was at the site and available for reference by appropriate parties during work at the site. 2.0 SOIL BORING AND SOIL SAMPLING PROTOCOL Soil borings and soil sampling was performed under the supervision of a Delta geologist. The soil borings were advanced using a truck-mounted hollow-stem auger drilling rig. To reduce the chances of cross-contamination between boreholes, all downhole drilling equipment was steam- cleaned between each boring. To reduce cross-contamination between samples, the split-barrel sampler was washed in a soap solution and double-rinsed between each sampling event. ,. Soil sampling was conducted in accordance with ASTM I586-84. Using this procedure, a 2-inch diameter, slit- barrel sampler (California-type sampler) lined with three 2-inch by 6-inch long brass sample tubes is driven into the soil at approximately 5-foot intervals by a 140-pound weight falling 30 inches. The number of blow counts required to advance the sample 18 inches was recorded at each sample interval. Upon recovery, a portion of the soil sample was placed in a plastic bag and sealed for later screening with an hNu type photoionization detector (PID). Another portion of the soil sample was used for classification and description. One of the brass tubes was sealed and stored at approximately 4°C for transport to the laboratory. After the soil samples, placed in a plastic bags, were allowed to warm, inducing volatilization of petroleum hydrocarbon vapors, the headspace vapors were screened with the organic vapor meter. The highest observed readings were then recorded on the boring logs. 3.0 GROUND WATER DEPTH DETERMINATION Depth to ground water was measured to the nearest 0.01 foot using an electronic hand held water level indicator. The tip of the probe was examined to determine whether a product sheen was present. LRP083.TA