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Work Plan-Pilot Testing Page 12 Cutter Lumber Site ' • Project Na. 102.3 October 30,2001 ' 6.0 SOIL & GROUNDWATER R NDWATER SAMPLING & ANALYSIS 6.1 Soil Sample Collection Soil samples will be collected for geologic and possible analytical evaluation on five foot ' intervals in each new boring unless otherwise noted. The following is a description of the methods used in collecting soil samples. i ' 6.1.1 California Split Spoon ' In hollow stem auger borings, soil samples will be collected for geological and analytical evaluation at five-foot intervals using a 2.0-inch diameter by 1.5 foot long (i.d.) hammer driven California Split Spoon sampling device fitted with three 2 by 6 inch stainless steel ' liners. The soil sample collection procedure will be as follows. The end of each sample tube removed from the split spoon will be 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 (CofQ forms are • documents used to track the handling of samples. All dates, times, persons and companies handling the samples will be listed from the time the sample is collected to its ' ultimate disposal. All soil sampling equipment will be decontaminated between uses by washing using a steam cleaner. Nitrile gloves will be worn during sample collection and changed between the collection of each sample. A detailed log will be made of each boring. The information to be noted include 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 (color, texture, composition, hardness, moisture content, and post-depositional changes that have occurred in the sediments). ' 6.2 Groundwater Sample Collection No special groundwater monitoring will be conducted as a part of the pilot test, except that dissolved oxygen will be monitored in several nearby wells. Stagnant water in the well casing will be purged using a submersible Grundfus pump. The rate of well purging will be monitored. Prior to beginning the pilot test, monitoring wells MW-7, MW-7, ' MW-813, and MW-9 will be purged of at least three casing volumes and then purged until the groundwater parameters (temperature, conductivity, and pH) have stabilized indicating that water, representative of actual aquifer conditions, is entering the well. ' 2937 Veneman Ave.,#13240 Geo-Phase Environmental Inc. Phone(209)569-0293 Modesto,CA 95356 Fax(209)569-0295