ARCHIVED REPORTS_1988 - Laserfiche WebLink

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Soil samples for logging and testing will be collected by driving a modified California split-spoon sampler having a 2-inch-inside- diameter and a 2.5-inch-outside-diameter. The sampler will be lined with 2-inch-diameter,. stainless steel , thin-walled rings. The sampler will be driven 18 inches into the undisturbed soil at each sampling interval before advancing the borehole with the drill bit. Soil samples from the shallow borings will be collected by driving the sampler into the soil using a 140-pound hammer dropping an average of 30 inches. The sampler will be pushed into the soil in advance of the drill bit on the deeper borings. - After the sampler is driven and withdrawn from the hole, both ends of the stainless steel rings will be wrapped with Teflon. Polypropylene caps will be placed over the Teflon to seal the, rings. The rings will be placed in glass jars and labeled. All samples will be immediately placed in an ice chest and maintained at 4°C with frozen gel packs. Upon sample collection, chain-of-custody documentation will be initi- ated. This document will accompany the samples to the laboratory. At the laboratory, EMCON personnel will accept the samples by signing the chain-of-custody document and assigning a unique number to each sample. Plate B-1 shows a typical soil analysis request form. Other representative samples for geologic logging will be retained in plastic bags. FQ�i„ment Cleaning. Boring equipment, including augers, drill rods, drill bits, and drive samplers, will be steam cleaned before starting operations at each boring to prevent possible cross-contamination between borings. In addition, the drive samplers will be washed in a trisodium phosphate detergent solution and rinsed after each sample interval to prevent A possible cross-contamination between drives. After sampling, soil borings that are not converted to monitoring wells will be backfilled with a cement-bentonite grout. PJ9 9390313.000 -