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Maximum volume of residual diesel in soil V x D x G = R where V = volume of impacted soil in cubic feet D = maximum in place diesel concentration in parts per million G = conversion factor - number of gallons per cubic foot R = maximum residual diesel remaining in gallons 1,050 ft3 x 0 00011 diesel content x 7 48 gallons/] ft3 = 0 864 gal Note This calculation presents a maximum residual diesel fuel volume The area used for calculation of the residual diesel is based on existing analytical results The average residual in situ diesel fuel concentration should be less than the maximum diesel fuel content used in this calculation Due to this fact, the residual diesel fuel is likely to be less than the maximum volume calculated This calculation should be considered an order of magnitude estimate only 7.0 Extent of Petroleum Hydrocarbons in Groundwater Survey and monitoring data indicated that groundwater flows to the east northeast with a gradient of 0 01 ft/ft The water table was encountered at approximately 42 feet below grade Historical water level data is listed in Table 3. No detectable amounts of petroleum hydrocarbons or volatile organics were measured in any of the groundwater samples collected subsequent to the initial sampling event A summary of groundwater sample analytical results are listed in Table 4. 8.0 Remediation Activities and Effectiveness 8.1 Soil Remediation 8.1.1 Basement Area The residual diesel fuel in the basement area has been investigated over time with concentrations remaining relatively constant The source of this soil impact, two small diesel USTs, has been eliminated by abandoning the USTs in place according to regulatory guidelines No soil remediation has been attempted or appears cost effective due to the poor access, the low volatility of fuels, and the difficult working conditions beneath the building. M7/04-W95/UST/95-0089 10