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DEC-le.2000 5:33PM ARCADIS GERAGHTY&MILLER/JSA N0.698 P.3i17 <br /> � Y <br /> Mr.Jeffrey Wang <br /> 18 December 2000 <br /> I <br /> Scope of Work <br /> Prefield Activities <br /> ARCADIS Geraghty&Miller will,contract with,schedule, and direct a drilling <br /> company to advance four boreholes at the site.The approximate locations of these <br /> boreholes are shown on the attached figure. <br /> A;utility locator service will be retained to provide clearance of all boring locations <br /> in advance of the drilling activities. <br /> ARCADIS Geraghty&Miller has prepared a site Health and Safety Plan(HASP)in <br /> accordance with the Occupational Safety and Health Administration(OSHA)and the <br /> California Occupational Safety and Health Administration(Cal-OSHA)regulatory <br /> requirements. A copy of the HASP is attached. The HASP incorporates site-specific <br /> considerations including known hazards,emergency evacuation routes, emergency <br /> response procedures,and the location of the nearest hospital.The HASP will be <br /> communicated to all project staff. <br /> Advancement of Soil Borings and Collection of Soil Samples <br /> ARCADIS Geraghty&Miller will advance four soil borings on the site at the <br /> approxim4te locations identified on the attached figure. The temporary soil borings <br /> will be installed using GeoprobeTM type direct-push sampling equipment operated by a <br /> licensed drilling contractor.The GeoprobeTM sampling rig utilizes hydraulically <br /> actuated equipment to drive a hollow,cylindrical GeoprobeTM drive casing into the <br /> ground. <br /> A IWinch by 4-foot acrylic sleeve will be installed inside the sampling barrel of the <br /> drive casing before it is advanced.After being driven 4 feet,the sampling barrel will <br /> be removed from the borehole. The acrylic sleeve containing the soil will be removed <br /> from the sampling barrel.A new acrylic sleeve will be added and then the sampling <br /> barrel will be,lowered back into the borehole to the previous depth.The drive casing <br /> will then be advanced an additional 4 feet.This process will be repeated until the <br /> drive casing reaches the target depth. The soil borings will be advanced to <br /> approximately 12 feet below ground surface(bgs). Two unsaturated soil samples <br /> will be collected for possible laboratory analysis from each soil boring, One sample <br /> will be collected from approximately 1 foot bgs,and a second sample will be <br /> collected from approximately 12 feet bgs for possible laboratory analysis. <br /> Soil samples for lithologic description will be cut from the acrylic sleeve and visually <br /> described and classified according to American Society for Testing and Materials <br /> (ASTM)D 2488-93.The entire boring will be described and classified on a boring <br /> log., <br /> Page: <br /> 2/3 <br /> i <br />