SITE INFORMATION AND CORRESPONDENCE

Home Browse Search

F,ELy METHODS AND PROCEDURES FRID 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 ur L-TH 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 SOL SA IKR G Soil boring and sampling will be performed under the direction of a qualified Delta representative. The soil borings will be drilled using a truck-mounted rotary drilling rig and hollow-stem augers. 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 brass sample tubes, the outside diameter equal to the inside diameter of the sampler. All soil samples will be 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 will be 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. All drilling and sampling equipment will be cleaned prior to drilling each boring using a high-pressure, steam-cleaning apparatus. The split-spoon sampler will be cleaned with phosphate-free soap and rinsed LRPM.SIS