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FIELD PROCEDURES <br /> This section describes the field procedures which are normally followed during hydrogeologic <br /> investigations Some of these procedures are generalized The main body of the report describes any <br /> specific procedures followed for this particular project <br />' A.1 Soil Sampling <br /> 1 Soil borings will be advanced to describe the subsurface according to the precision of the sampling <br /> program described in the workplan The sampling intervals should detect the presence or absence of <br /> petroleum hydrocarbon fuel findings, through soil samples submitted for laboratory analysis. The <br /> locations of the borings are selected on the basis of existing site data and drill rig accessibility A Du <br /> Pont field geologist will supervise the drilling and sampling program to ensure the selected locations <br />' of the borings, the sampling interval, and the use of the proper sampling methods <br /> Prior to drilling, Du Pont will have appropriate public utilities delineate their lines In addition, Du <br /> Pont will probe and use magnetic instruments to detect underground lines immediately beneath the <br /> boring location Although Du Pont will exercise reasonable care in protecting any underground <br />' pipelines, tanks, and other equipment during drilling operations, we cannot be responsible for <br /> underground equipment not identified on "as built" drawings or utility lines not identified by the <br /> cognizant utility companies Du Pont will also obtain any necessary drilling and well installation <br /> permits <br />' A hollow stem auger drilling rig will be used to advance the soil borings All drilling equipment will be <br /> steam cleaned as necessary No drilling fluids or additives will be used Soil samples will be obtained <br /> by the split spoon method Split spoon soil samples will be retrieved at specified intervals Each split <br />' spoon soil sample will be logged in detail and classified according to the Unified Soils Classification <br /> System by the supervising field geologist <br /> Uncontaminated soil cuttings by laboratory analysis may be distributed around the subject location in <br /> an inconspicuous and reasonable manner with the approval of the client Soil cuttings which are known <br />' to be or suspected to be contaminated may be stockpiled on an impermeable surface of plastic sheeting <br /> and covered with an impermeable plastic sheeting top The stockpile must be located on the property <br />' of the site and may be uncovered to permit aeration as weather permits Alternatively, soil cuttings <br /> may also be drummed for later removal All potentially contaminated drill cuttings will remain on the <br /> property of the client <br />' As a <br /> split spoon sample is retrieved from the borehole, one aliquot of the soil sample from within the <br /> split spoon will be transferred to a container for possible laboratory analysis, and one aliquot will be <br /> transferred to an air tight container for on-site headspace analysis An Organic Vapor Meter (OVNI) <br /> will then be used to scan the headspace in the container for organic vapors The OVM readings for <br /> 4005111 Rev o DuPont Environmental Remediation Services A-i <br />' Printed on Recycled Paper <br />