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The results of the groundwater samples indicated no levels of Fuel Oxygenates and <br /> Additives above the analytical detection limits <br /> TPHIg, BTEX results of the groundwater samples were as follows <br /> Results in Parts Per Billion (PPB) <br /> Sample# TPHIg Benzene Toluene EthylBenzene Xylenes <br /> MW-3 ND<50 ND<1 ND<1 ND<1 ND<3 <br /> MW-4 1570 ND<1 3 17 11 <br /> Detection <br /> Limit 50ppb 1ppb 1ppb 1ppb 3ppb <br /> DETERMINATION OF HORIZONTAL GROUNDWATER GRADIENT <br /> On September 8, 2003, the water levels in monitoring wells MW1 through MW5 were <br /> measured within a fifteen minute period The water surface elevations in the wells, with the <br /> elimination of well MW1 due to inconsistent data, were calculated using the previous well <br /> head elevation survey Then, the horizontal hydraulic gradient was calculated based on <br /> well locations depicted in the ACT Environmental site plan (Drawing number 94-326-A36) <br /> found in the August 2002 Monitoring Report The gradient calculated showed a 0 25% <br /> magnitude in a southwest flow direction <br /> Respectfully submitted this 29th day of Septemb go <br /> Da 011 <br /> .. g <br /> Bennett T Halsted - Samuel H- Hals <br /> Project Manager C E 14095 JS <br />