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1 0 METHODS AND PROCEDURES <br /> 1 1 Health and Safety Plan <br /> Field work performed by Delta and its subcontractors at the site was conducted according to guidelines <br /> established in the Site Health and Satety Plan (SHSP) The SHSP is a document which describes the <br /> hazards that may be encountered to the field and specifies protective equipment, work procedures, and <br /> emergency intormation A copy of the SHSP was at the site and available for reterence by appropriate <br /> parties during work at the site <br /> 1 2 Locating Underground Utilities <br /> Prior to commencement of work on site, Delta researched the location of underground utilities with the <br /> assistance of Underground Service Alert (USA) USA contacted the owners of the various utilities in the <br /> vicinity of the site to have the utility owners mark the locations of their underground utilities <br /> 13 Soil 5amRiing and Contamination Reduction <br /> Soil borings and soil sampling was performed under the direction of a Delta engineer or geologist The <br /> soil borings were advanced using a truck-mounted hollow-stem auger drill rig <br /> To reduce the chances of cross-contamination between boreholes,downhole drilling equipment was steam- <br /> cleaned prior to drilling To reduce cross-contamination between samples, the split-barrel sampler was <br /> washed in a soap solution and double-rinsed between each sampling event <br /> Soil sampling was conducted in accordance with ASTM 1556-84 Using this procedure, a 2-inch <br /> outside-diameter split-barrel sampler or a 2-inch inside-diameter California-type sampler is driven into <br /> the soil by a 140-pound weight tailing 30 inches Atter an initial set of 6 inches. the number of blows <br /> required to drive the sampler an additional 12 inches is known as penetration resistance or the "N" value <br /> The N value is used as an empirical measure of the relative density of cohesionless soils and the <br /> consistency of cohesive soils <br /> Upon recovery, a portion of the soil sample was placed into a ziplock bag and sealed for later screerung <br /> with a phototoruzation detector (PID) Another portion of the soil sample was used for classification and <br /> description. That part of the soil sample collected in brass tubes within the California-type sampler was <br /> stored at approximately 4°Celsius for transport to the laboratory <br /> LRP407 SIS <br />