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Blockbuster Yideo/Yellow Submarine November 24, 1992 Manitoring Well Installation Page 3 1 The spoils pile of contaminated soils is stockpiled on site and covered with a plastic ' tarp. The spoils pile consists of approximately 80 yards of soil. In August and September of 1991, three monitoring wells were installed on the site. However, one of these wells, MW-3, had a low productivity and never reached stability during well development. It is thought that somehow cement had gotten down into and plugged the perforated casing. Nevertheless, MW-3 does probably reflect the ' level of the piezometric surface when it is allowed to stabilize over a long period of time and is therefore valuable in establishing the groundwater gradient at the site. ' 3.0 OBJECTIVES AND SCOPE OF WORK ' The objective of this phase of work was to attempt to determine the lateral and vertical extent of soil contamination left in place in the excavation and to determine if ' groundwater was contaminated. To accomplish these objectives, one monitoring well was installed. This well was sited to intersect the downward extension of the narrow plume of contamination left in the wall and bottom of the excavation at a depth of 22 feet. ' 4.0 DESCRIPTION OF WORK Monitoring well installation was begun on September 22, 1992, by Pierson Drilling of Modesto, California. The well was sited twenty feet east of MW=1 and was designed to intercept the plume of contamination left in the bottom of the excavation. ' All tooling was steam cleaned prior to transport to the site. Drilling was begun and the boring was drilled with the auger to 20 feet without sampling. However, the cuttings ' were logged as they came to the surface. Sampling, using a modified California split spoon sampler, was started at 20 feet and thence every five feet until the water table was reached. All soil sampling equipment was thoroughly washed with TSP (tri ' sodium phosphate) solution and rinsed before and between sampling to prevent cross contamination. ' A sample for analysis was collected from each sampled interval. These samples were immediately sealed in their liners using aluminum foil-lined plastic caps that were taped in place with duct tape. The samples were then transferred to an ice chest containing ' both ice and blue ice. The samples were immediately transported for analysis to Geo- Monitor, Inc., a California State-certified laboratory, under chain of custody. 1 1