ARCHIVED REPORTS XR0006894 - Laserfiche WebLink

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ATTACHMENT A FIELD PROCEDURES Drilling Methods Before drilling begins, EMCON will notify Underground Service Alert of its intent to drill so that ,approximate locations of underground utility lines and structures can be marked The soil borings are started by hand-angering to a depth of 5 feet to minimize the possibility of damaging underground utilities The borings are drilled with a mobile B-61 or similar drill ng equipped v.ith 8-inch-outside- diameter by 4-1/4-inLh-inside-diameter, continuous-flight, hollow-stem augers The augers are ,,team-cleaned before use in each boring to rrunimize cross-contamination of the borings The drill cuttings are stored in type 17-E, steel, 55-gallon drums or stockpiled on site and covered with plastic before disposal at an appropriate disposal facility Soil Sampling in Borings Soil samples are collected by advancing the boring to a point lust above the sampling depth, and then driving a California-modified, split-spoon sampler containing clean brass sleeves through the hollow center of the auger into the soil The sampler is driven IS inches with a standard 140-pound hammer repeatedly dropped 30 inches The number of blows needed to drive the sampler each successive 6 inches is counted and recorded to evaluate the relative consistency of the soil Sampling equipment is cleaned between each use with an industrial soap and clean tap water Logging of Borings Soil samples are logged using the Unified Soil Classification System Samples are extruded in the field for examination The texture, color, moisture, plasticity, and consistency of soil, the blow counts, and subjective evidence of hydrocarbons, such as soil staining, obvious product odor, and photoionization detector (or similar instrument) readings, are noted in the field on the Logs of Borings U-TKNOF9"F900020 4AS-95 PAS 2 A-I Rev 0 5/1/95