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iNTcRNAT1QNAL'f�CHNQLOG�CQRPORATION <br /> EXECUTIVE Si1tiWY <br /> IT Corporation (IT) was retained by BP Oil :ompany to perform a site <br /> assessment as described in the IT Corporation PRELIMINARY HYDROGEOLOGIC <br /> ASSESSMENT. <br /> The investigation included the installation and sampling of four thirty-foot <br /> monitoring wells. During drilling soil samples from each borehole were <br /> collected at five-foot intervals with three samples collected above the water <br /> table interface (i.e., samples from a twenty-foot depth) submitted for <br /> '^ chemical analysis. Following well installation, all well casings were <br /> ... surveyed to a common datum. Survey data combined with water level measure- <br /> ments in each well were utilized to calculate the directional flaw of shallow <br /> groundwater. <br /> Soils encountered at each borehole consisted primarily of a lean clay below <br /> approximately two to three feet of well-graded gravel fill. At an approximat_ <br /> depth interval of twanty-two to twenty-six feet below grade, a clayey sand <br /> layer comprised the primary water bearing unit encountered. <br /> rJ <br /> Water level measurements indicate that the groundwater flow direction is <br /> north-northeast under a gradient of 0.004 ft/ft. As such, MW-3 is located <br /> �. directly downgradient of the gasoline tank field and pump islands, while MW-1 <br /> and MW-4 are located side gradient and RW-2 is located upgradient of the on- <br /> site petroleum hydrocarbon storage and transfer facilities. MW-4 is also <br /> located adjacent to a waste oil and motor oil tank field. <br /> No free product was observed in any of the monitoring wells. Total petroleum <br /> hydrocarbons as gasoline were reported in water samples from MW-1 and MW-3 at <br /> --" concentration of 0.140 ppm and 0.20 ppm respectively. Non-detectable levels <br /> of TPN as gasoline were reported for all soil samples analyzed. <br /> No fecal coliform was detected in groundwater samples from MW-1, MW-2 and <br /> MW-3. <br /> -- ---- - - - - --The-removal-of---the-gasoline-tanks-and-piping--is-in-the-planning-process. -- - ---- _----- --, <br /> w Results from this work will help .determine if further investigation is. <br /> warranted. <br /> v` <br /> I:ENG:7024/072390 - <br />