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URS <br /> Mr. Harlan Knoll Page 2 <br /> San Joaquin County.Environmental Health Department <br /> February 25,2004 <br /> Well Destruction Methods <br /> Six groundwater monitoring wells (MW-2, MW-3, MW-9, MW-1A, MW-2A, and MW-2B), one <br /> groundwater extraction well (E-1), and 8 soil vapor extraction.wells (V-1 through V-8) will be properly <br /> destroyed by a licensed drilling contractor at the direction of a URS geologist. Well construction details <br /> are summarized in Table 1. At present, data for total depth and well diameter for extraction well E-1 is <br /> not available however this data will be collected in the field.prior to destroying the well. <br /> Each well will be destroyed by over-drilling with hollow-stem augers to total depth and filling with a <br /> Portland cement grout containing <5% bentonite powder to near surface. Surface completion will <br /> consist of concrete that will be placed such that it matches the surrounding ground surface. <br /> Drill cuttings generated during the well destruction activities will be placed-in a labeled closed-top soil <br /> bin and stored on site, pending disposal. A composite .soil sample will be collected from the soil <br /> cuttings and submitted to the Sequoia Analytical Laboratory in Petaluma, California, to be analyzed for <br /> gasoline range organics (GRO) by EPA Method 8015B (preparation EPA Method 5030), benzene, <br /> ethylbenzene, toluene, and xylenes, (BTEX) by EPA Method_ 8260B (preparation EPA Method 5030), <br /> and lead by EPA Method�6000/7000 series. <br /> Report Preparation <br /> Following completion of the field activities a report will be prepared. The report will include well <br /> destruction details. <br /> K:\WprocessV5 BP ARCO\00434\Well Destruction Workplan\434 Well Destruction Workplan.doc <br />