three well site check bldg lch-4022
three well site check bldg lch-4022
three well site check bldg lch-4022
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1 .O INTRODUCTIONGroundwater Technology Government Services, Inc. (GSI) contracted by the Atlantic Division (LANTDIV)Naval Facilities Engineering Command (NAVFACENGCOM) of the Department of the Navy to conduct a<strong>site</strong> <strong>check</strong> to identify and/or verify suspected hydrocarbon-impacted subsurface soils and groundwater.The <strong>site</strong> <strong>check</strong> was performed at Building LCH-<strong>4022</strong> located at Marine Corps Base, Camp Lejeune,North Carolina.This <strong>site</strong> <strong>check</strong> is based on the NAVFAC contractual requirements. Our efforts included severalactivities:nDrilling of <strong>three</strong> soil borings;1 Installation of <strong>three</strong> monitoring <strong>well</strong>s (LCH<strong>4022</strong>-1, LCH<strong>4022</strong>-2 and LCH<strong>4022</strong>-3) tofacilitate groundwater sampling;n Collection of soil and groundwater samples for laboratory analyses forpetroleum hydrocarbon concentrations;w Surveying of monitoring <strong>well</strong>s for location and elevation;n Determination of groundwater flow direction and gradient; andn Characterization, removal and treatment/disposal of soil cuttings and purgedgroundwater generated during field activities.Subsequent sections of this report will describe <strong>site</strong> background information; <strong>site</strong> conditions in terms ofphysiography, geology and hydrogeology; and results of the field investigations including the evaluationfor and concentrations of any petroleum hydrocarbons in the subsurface soils and groundwater.1.1 Definition of TermsThis section defines the four phases which petroleum hydrocarbons may exist in the subsurface. Liquidphasehydrocarbons are liquids that may exist in the subsurface as an immobile residual liquid in theunsaturated zone and capillary fringe or free mobile liquids that migrate near the top of the capillaryfringe. Dissolved-phase hydrocarbons are liquid-phase hydrocarbons which have dissolved in thegroundwater. The tendency for hydrocarbons to transfer to the dissolved phase is a result of the degreeof mixing and contact, and the solubility of the released substance in the groundwater. Dissolved-phasehydrocarbons can be present in infiltrating water in the unsaturated zone, the capillary fringe and in the1
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