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IN , M. FIELD PROM)URCS This section describes field procedures used by Delta personnel in the performance of the tasks iave'.ved with this project. 1.0 SOIL BORING AND SOIL SAMPLING PROTOCOL Prior to the commencement of work on site,Delta researched the location of all underground utilities with the assistance of Underground Service Alert(USA). LSA contacted the owners of the various utilities in the vicinity of the site to have the utility owners mark the location of their underground utilities. Work associated with the boring and monitoring well installation was preceded by hand angering to a depth of 5 feet to avoid contact with underground fuel distribution lines and unmarked utilities. Drilling and soil sampling were performed under the direction of a Delta geologist. The geologist logged -- each boring by visual examination or the soil samples and soil cuttings. Soils were classified according to -- the Unified Soil Classification System(USCS). The soil boring logs indicate the depth of the various strata and other pertinent information. Soil borings were advanced by a truck-mounted drill rig using hollow-slam auger. To reduce the chances _ of cross-contamination between boreholes,all downhole drilling equipment was steamed-cleaned between *r each boring. To reduce cross-contamination between samples.the split-barrel sampler was washed in a soap 'r solution and double rinsed between each sampling event. "- Soil sampling was performed in accordance with ASTM 1556-34. Using this procedure a 2-inch inside- Oiameter,California-type sampler lined with three 6-inch long brass tubes,was driven irtC;)the soil by a 140- pound weight falling 30 inches. The number of blows required to drive the sampler 18 inches was recorded on the soil boring logs. Upon recovery,a portion of the soil sample was placed into a soil sample 4o1lection jar and sealed for later screening with a photoioniwtion detector(PID). Another portion of the soil sample was used for classification and description. The soil sample collected in the leading brass tube within the California-type sampler was capped, packaged, and preserved according to accepted Environmental Protection Agency(EPA) procedures for possible laboratory analysis. The portion of the soil sample retained for organic vapor screening was placed into a clean standard soil sample collection jar. Each jar was filled.approximately one-half full,then the mouth of the jar was covered with aluminum foil and capped with a lid. Jars were placed out of direct sunlight for at bast 20 minutes, allowing time for the air in headspace and soil to equilibrate. The probe of the PID was inserted through _ the aluminum foil.and the highest observc;d reading recorded on the soil boring log.