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u e FIELD METHODS AND PROCEDURES FIELD PROCEDURES The following section describes field procedures that will be 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 will be 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 will be at the site and available for reference by appropriate parties during work at the site. 2.0 DRILLING AND SOIL SAMPLING Soil borings and soil samples will be performed under the direction of a qualified Delta representative. Soil borings will be drilled using a truck-mounted rotary drilling rig and hollow-stem augers. The soil borings will be drilled to approximately 50 to 65 feet below the ground surface. Soil sampling will be conducted in accordance with ASTM 1586-84 using a 2-inch inside-diameter California-type sampler driven into the soil by a 140-pound weight falling 30 inches. After an initial set of 6 inches, the number of blows required to drive the sampler an additional 12 inches, known as penetration resistance or the "N" value, is recorded. The "N" value is used as an empirical measure of the relative density of cohesionless soils and the consistency of cohesive soils. The sampler is lined with three 2-inch by 6-inch brass sample tubes. Samples will be collected at 5-foot intervals or as directed by the geologist. All soil samples are examined in the field by a geologist and described by color, grain size, moisture content and are classified in accordance with the Unified Soil Classification System. A portion of the soil sample is placed into a plastic bag and sealed for headspace analysis of the organic vapors using a photoionization detector (PID). The soil sample collected in the leading brass tube within the California-type sampler will be labeled, sealed, and stored on ice pending sample selection and transport to the laboratory for analysis. 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, the "N" value, and pertinent information regarding the method of maintaining and advancing the borehole will be made. LRP 129.SJH