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File No. 20 3978 01.15 • p January 6, 1997 M KLEINFELDER Hand Auger Soil Sampling A total of 18 hand auger borings will be advanced at the two cooling tower locations. The cooling towers have not been removed from the Spreckels property, therefore, the sampling will be conducted immediately adjacent to the cooling towers. Six hand auger borings will be advanced at cooling tower location 1 (Plate 2), and 12 hand auger borings will be advanced at cooling tower location 2 (Plate 3). Concrete cutting will be required north of cooling tower location 2. Soil samples will be collected at the surface and at a depth of two feet below grade. A clean hand auger will be used to advance each soil boring to the desired sampling depth. Soil samples will be collected at depths of 0 to 6 inches, and two feet below grade. Soil samples are obtained by driving a 2-inch diameter by 6-inch long brass tube into the soil using a slide hammer. The brass tube is then removed from the boring and sealed with Teflon sheeting and plastic end caps. The sample is then labeled, and placed in an iced cooler pending transportation to the analytical laboratory under chain of custody protocols. The hand auger borings will be logged, and sampled according to the protocol described in Attachment B. The soil samples collected will be field screened using an organic vapor detector as described in Attachment B, Section B-2.2. The hand auger borings will be backfilled with the cuttings generated during sampling. Laboratory Analysis One soil sample from each hand auger location will be submitted under chain-of-custody control to Sequoia Analytical Laboratories (Sequoia) of Sacramento, California. Sequoia is certified by the California Department of Toxic Substances to perform the requested analyses. It is anticipated that samples will be analyzed on a normal laboratory turnaround schedule, which usually requires up to 10 working days for receipt of analytical data. The soil samples will be analyzed for hexavalent chromium by colorimetric spectrometry. REPORT PREPARATION Upon completion of the soil sampling and our receipt and review of the analytical results, a report will be prepared for client review. The report will include: • A description of field activities, observations, and protocols; • Lithologic logs and, if appropriate, interpreted geologic cross sections; • Tabularized results of soil sample analysis with copies of certified analytical laboratory results with chain-of-custody documentation; • Conclusions and recommendations. 103978-01.W151207PE009 Page 3 of5 January 6, 1997 Copyright 1997, Kleinfelder, Inc.