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' GEOSYNTEC CONSULTANTS <br /> Ms. Amy Terrell <br /> 31 January 2005 <br /> Page 6 <br /> In advance of the field sampling program, the site and proposed boring locations <br /> will be surveyed by a licensed surveyor, to provide a more accurate site map and assist <br /> with evaluation of possible source areas, if any. <br /> ' Field Preparations <br /> ' GeoSyntec will obtain drilling permits from the San Joaquin County Department of <br /> Environmental Management. The sample locations will be marked with white paint and <br /> Underground Service Alert will be notified. The locations will be adjusted as needed to <br /> ' avoid any marked utilities or overhead lines. <br /> Field Methods—Direct Push Soil Sampling <br /> Soil samples will be obtained with a Geoprobe or similar direct push drilling rig. <br /> Soil samples will be logged by a GeoSyntec geologist according to the Unified Soil <br /> ' Classification System (USCS). Samples will be collected in acetate sleeves, which will <br /> be cut at appropriate intervals and sealed with Teflon sheeting and plastics caps. <br /> ' Samples will be labeled with sample number, date, and time of collection, and placed in <br /> a cooler with ice. All samples will be shipped under standard chain of custody <br /> procedures to an analytical laboratory certified by the California Department of Health <br /> Services. <br /> All downhole drilling and sampling equipment will be decontaminated before use <br /> and between sample locations by washing with laboratory-grade detergent and potable <br /> water followed by rinsing with distilled water. After sampling is completed, the <br /> boreholes will be tremie grouted with Type I/II Portland cement mixed with bentonite <br /> powder. <br /> Soil cuttings will be contained in drums, and stored at the JTF facility pending <br /> analytical results and appropriate disposal. <br /> ' Analytical Plan <br /> Soil samples will be analyzed for the following constituents by these methods: <br /> ' P:\PRJ2003REM\Wilbur-Elks\WtO250(JTF)\STOCKTON\S 1.X\2005 Source Area Invest\SSI Work Plan.doc <br /> w G� <br /> RECYCLED AND RECYCIAELE r <br />