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2.2 Hydrogeologic Conditions <br /> IGroundwater is present beneath the site at a depth of 31 60, 32 50, 32 35 and 30 95 feet below <br /> to of casing btc as measured on 1 February 2003 in the four groundwater monitoring wells <br /> p g { )� rY <br /> (MW-1, MW-2, MW-3 and MW-4 respectively) installed on site The elevation of groundwater <br /> I in MW-1, MW-2, MW-3 and MW-4 was calculated by El to be at 18 58, 19 08, 19 51 and 18 60 <br /> feet below mean sea level respectively, based upon casing elevation data from Kier & Wright <br /> ICivil Engineers and Surveyors <br /> 3.0 FINDINGS <br /> 31 Groundwater Level Measurements <br /> IThe elevation of groundwater in MW-1, MW-2, MW-3 and MW-4 was calculated by El to be at <br /> 18 58, 19 08, 19 51 and 18 60 feet below mean sea level respectively on 1 February 2003 <br /> El utilized the groundwater measurements to determine the direction of groundwater flow and <br /> the groundwater gradient present beneath the surface Groundwater elevations formed a sloped <br /> trough through MW-3 This resulted in a groundwater flow easterly from MW-1 to MW-3 at a <br /> • gradient of 002 ft/ft, southerly from MW-2 to MW-3 at a gradient of 0 003 ft/ft and <br /> southwesterly from MW-4 to MW-3 at a gradient of 0 01 ft/ft This phenomena has not been <br /> seen at this site previously and may be due to some external influence <br /> The groundwater elevations increased approximately 15 feet in MW-1 and MW-4 from <br /> ISeptember 2002 to February 2003, and remained constant in MW-2 and MW-3 <br /> Groundwater elevations are listed in Table 1, and shown graphically in Figure 4 <br /> 3.2 Groundwater Sample Analysis Results <br /> The groundwater was sampled on 1 February 2003 MW-1 continued to show TPH-gasoline and <br /> TPH-diesel contamination The level of TPH-gasoline contamination increased 6 fold, However, <br /> the level of TPH-diesel contamination decreased 8 fold MW-1 remains free of motor oil <br /> contamination and BETX no longer appears <br /> MW-2 continued to show motor oil contamination as well as moderate contamination from TPH- <br /> i <br /> I <br /> Environeenng,Inc Project No 03 00218 mage 3 <br /> 1 <br />