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i <br />' WELL DEVELOPMENT <br /> This section describes the field and analytical procedures to be followed by ENSR <br />' throughout the investigation <br />' General Well Development Procedures <br /> The water level and well depth is measured with a water level indicator and written on <br /> the well development record This information is used to calculate the volume of <br /> standing water (i e , the well volume) within the well Drilling fluids such as mud or water, <br />' if used during the drilling and well installation process, are removed during the well <br /> development procedure It is recommended that a minimum of 1 5 times the volume of <br />' added fluid be removed from the well during development Drilling muds are initially <br /> flushed from the drilling casing during the well installation procedure with water added <br /> during the flushing process If the quantity of added fluid is not known or could not be <br /> I reasonably estimated, removal of a minimum of 10 well volumes of water is <br />' recommended during the development procedure <br /> WELL DESTRUCTION <br /> Prior to well destruction, each well's total depth was measured and any obstruction or salt <br />' accumulation was removed Existing well boxes were removed and the total depth of <br /> the well casing was over-drilled using a truck mounted auger drilling ng using 8-inch <br /> hollow stem augers A cement bentonite slurry was emplaced from the bottom up via a <br /> tremae pipe to within 18-inches of surface grade The upper most 18-mchest of the <br /> boring was backfilled with concrete and finished at the surface to match the surrounding <br /> grade <br /> 3 STORING AND SAMPLING OF DRILL CUTTINGS <br /> Drill cuttings generated during well installation and well destruction were stored in drums <br /> and tern omniv Gtnred onsite pending disposal at a Unocal aoaroved waste <br /> management facility Stockpile samples were collected and analyzed for disposal <br /> classification on the basis of one composite sample per 100 cubic yards of soil <br /> Stockpile samples were composed of four discrete soil samples, each collected from an <br /> arbitrary location on the stockpile The four discrete samples were composited in the <br /> laboratory prior to analysis <br />