ARCHIVED REPORTS_1988 - Laserfiche WebLink

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KLEINFELDER 3 FIELD ACTIVITIES 3.1 DRILLING AND SOIL SAMPLING Four soil borings were drilled in order to collect samples for chemical analysis on September 21, 1988. One of the soil borings (MW-1) was drilled approximately 150 feet south of the Mokelumne River, an area likely to have the highest concentration of waste based on previous investigations. The boring locations are shown on Plate 2. Samples of the waste, soil/waste interface, and vadose zone under the landfill were collected from the borings for chemical characterization. DdUing The soil borings were advanced using a truck-mounted drill. rig, equipped with 8-inch (MW-1) and 6-inch (B-2, B-3, and B-4) hollow-stem augers. During drilling, an experienced environmental geologist classified the soils using the Unified Soil Classification System(USCS), collected soil samples for laboratory analysis, and logged the borehole. The USCS is shown on Plate 3. The boring logs are shown on Plates 4 through 7. Borings,were advanced to approximately 2 feet below the waste/soil interface. To reduce the potential for cross-contamination, augers and associated equipment were steam cleaned prior to drilling each boring. In addition, sampling equipment was cleaned with a detergent wash and rinsed with distilled water prior to the collection of each soil sample. Soil cuttings produced during drilling were containerized in 55-gallon drums. Sampling Samples were collected from the borings, approximately every 3 feet for field screening, lithologic logging, and potential chemical analysis. Samples were collected by advancing the boring to a point immediately above the desired sampling depth and then driving a Modified Porter Sampler, lined with three brass tubes, into the undisturbed soil. The sampler was then removed from the bottom of the boring. The bottom (third) tube was 137-88-1663 6