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GeoStrategies Inc. April 20, 1990 <br /> FIELD NIETHODS AND PROCEDURES <br /> EXPLORATION DRILLIN <br /> Mobilization <br /> Prior to any drilling activities, GeoStrategies Inc (GSI) will verify <br /> that necessary drilling permits have been secured. <br /> Utility locations will be located and drilling will be conducted so as <br /> not to disrupt activities at a project site GSI will obtain and <br /> review available public data on subsurface geology and if warranted, <br /> the location of wells within a half-mile of the project site will be <br /> identified. Drillers will be notified in advance so that drilling <br /> equipment can be inspected prior to performing work <br /> Drilling, <br /> The subsurface investigations are typically performed to assess the <br /> lateral and vertical extent of petroleum hydrocarbons present in soils <br /> and groundwater Drilling methods will be selected to optimize field <br /> data requirements as well as be compatible with known or suspected <br /> subsurface geologic conditions <br /> Monitoring wells are installed using a truck-mounted hollow-stcm auger <br /> drill rig or mud-rotary drill rig Typically, the hollow-stem rig is <br /> used for wells up to 100 feet, if subsurface conditions are <br /> favorable Wells greater than 100-feet deep are typically drilled <br /> using mud-rotary techniques When mud rotary drilling is used, an <br /> electric log will be performed for additional lithological <br /> information Also during mud rotary drilling, precautions will be <br /> taken to prevent mud frons circulating contaminants by using a <br /> conductor casing to seal Off contaminated zones Samples will be <br /> collected for ltthologic logging by continuous chip, and where n(-cded <br /> by drive sample or core as specified by the supervising geologist <br /> Page I <br />