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Interim Emergency Remedial Action/Monitoring Well Installation Work Plan Page 8 hormer Union Facility, -Cutter Lumber Project No 102 2 May 20, 1997 ' spoon sampler with sample contained in two by six inch brass liners All soil samples will be sealed with aluminum foil, capped, labeled and placed in a cooler at 4° Celsius for transport to the laboratory following Chain of Custody protocol ' Not all soil samples collected are likely to be submitted for laboratory analysis ' Accordingly, a field screening procedure will be used to select those samples which will be tested Field observation methods (i a sediment type, color, texture, moisture and visible evidence of contamination such as staining and odor) will be used to held identify ' potentially contaminated soil A PID meter using a 10 0 eV lamp may also be used to detect the presence of organic vapors above background levels ' At least two soil samples from each boring, will be submitted to Sherwood Laboratories of Hilmar (DHS Certification #1400) for analysis for benzene, toluene, ethylbenzene and xylene (BTEX by method EPA 8020) as well as Total Petroleum Hydrocarbon as ' Gasoline and Diesel (TPH-G & D by EPA method 8015(m)) The detection limits for the BTEX analysis is 3 0 µg/kg , 1 0 mg/kg for TPH-Gasoline and 5 0 mg/kg for TPH-D A Chain of Custody will be completed for all samples collected and tracked to ensure ' sample integrity During the drilling of the free product extraction well (EW-1) and each of the monitoring wells, representative samples from the capillary fringe in each of these borings will be collected and submitted for analysis to obtain geotechnical information This will include testing for total organic carbon content (TOC), permeability, porosity using appropriate ' methodology ' 32 Well Construction & Sampling 3.2.1 Monitoring Well Construction ' Each well will be constructed using 2 0 inch diameter Schedule 40 PVC casing with flush threads The screened interval in all these wells will extend from the total depth of about 45 feet to 20 feet below grade The somewhat longer than normal screened interval is to allow for the large variation in season groundwater fluctuation which is known to vary by at least 14 feet A #3 sand filter pack will surround and extend two feet above the 0 020" ' slotted screened interval Before installing the bentonite transition seal, the well will be surged to assure proper settling of the filter pack material A granular bentonite transition seal will be installed and hydrated A surface seal will be achieved by pumping a neat ' cement grout (augmented with < 4% bentonite) via a tremie tube into the remaining annulus The wells will be secured with a locking watertight cap encased in flush mounted, traffic rated, well box These wells will be designated MW-6, MW-7, MW-8, and MW-9 and their top of casing elevations surveyed by a licensed land surveyor (See Figure 5 for a monitoring well construction schematic) 2937 Veneman Ave , #13240 Geo-Phase Environmental Inc Phone(209) 569-4293 Modesto,CA 95356 Fax(209)569-0295