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tReport—Remedial Action Feasibility Page 9 Cutter Lumber—Western Lift Site GPE Protect No 102 3 August 1,2003 ' 4.0 SOIL & AIR SAMPLING & ANALYSIS 4.1 Soil Sample Collection ' Whale drilling the new service wells, soil samples were collected for geologic and possible analytical evaluation on five-foot intervals unless otherwise noted The following is a description of the methods used in collecting soil samples ' Soil samples were collected for geological and analytical - p g g evaluation using a 2 0 inch diameter by 15-foot long (i d ) hammer driven California Split Spoon sampling device fatted with three 2 by 6 inch stainless steel liners The soil sample collection procedure was as follows The end of each sample tube removed from the split spoon was sealed with aluminum foil, capped with plastic end caps, secured with tape, labeled and placed in a cooler at 4° Celsius for transport to the laboratory using Chain of Custody protocol Chain of Custody (CofC) forms are documents used to track the handling of samples All ' dates, times, persons and companies handling the samples were lasted from the time the sample was collected to its ultimate disposal All soil sampling equipment was decontaminated between uses by washing using a steam cleaner Nitrile gloves were worn during sample collection and changed between the collection of each sample A detailed log was made of the boring and is attached as Appendix B The information ' noted included such data as sample depths, blow counts from hammer driven sampling devices, horizons of detectable contamination (detected by field methods), soil classification utilizing the Unified Soil Classification System and sediment description 1 (color, texture, composition, hardness, moisture content, and post-depositional changes that have occurred in the sediments) ' In general, the geologic character of the soil observed during drilling may be summarized as follows i ' 0 to 35+ feet Clay and Salt, gray to lave brown, semi-plastic to friable ' 35+feet to 45a feet Sand and Silty Sand, fine grained Streaks of Clay and Salt ' This characterization of the stratigraphy at the site is generalized The most important units as determined by installation of the two new wells as well as previously constructed ' wells are a sandy layer at about 35 to 45 feet with and clay-rich units above and below The upper clay unit appears to be the upper boundary of most of the contamination For more detail see the boring logs in Appendix B, and the cross-section attached as Figure 3 ' 2937 Veneman Ave ,#B240 Geo-Phase Environmental Inc Phone(209) 569-0293 Modesto, CA 95356 Fax(209) 569-0295 1