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W"/ <br /> Working To Restore Nature <br /> Total Mass of TPHg beneath facility = 241 lbs <br /> Total Mass of TPHd beneath facility = 195 lbs <br /> Total Mass of benzene beneath facility = 0.14 lbs <br /> Total Mass of toluene beneath facility = 8.5 lbs <br /> Total Mass of ethylbenzene beneath facility = 8.7 lbs <br /> Total Mass of xylenes beneath facility = 30 lbs <br /> This residual soil contamination is estimated to occupy an area of approximately 300 to 350 <br /> square feet between the depths of three and eight feet below grade. The volume of contaminated <br /> soil is estimated at a maximum of approximately 57 to 63 cubic yards, containing an estimated <br /> 241 pounds (36 gallons) of gasoline range hydrocarbons and 195 pounds (28 gallons) of diesel <br /> range hydrocarbons. These totals were estimated as "worst case scenario" and are likely higher <br /> than actual conditions due to an overlap of gasoline and diesel hydrocarbons reported by the <br /> laboratory (diesel values consisted of "non-diesel mix + discrete peaks"). In addition, the <br /> estimates assume a uniformly impacted area between three (the depth of the reported leak) and <br /> eight feet in depth (the depth of PID readings of zero). The actual affected area (and thus, the <br /> mass of contaminants) could be significantly less than our estimates. The affected area is <br /> covered with concrete. . Rain water cannot leach into the soil of this area. The presence of fat <br /> clay from approximately 7 to 10 feet below grade further reduces the potential for vertical <br /> migration of residual contaminants. <br /> 4_2 Groundwater -= - - <br /> No dissolved petroleum hydrocarbon analytes were detected at any time during groundwater . <br /> sampling from 1989 to the present. <br /> OWO I481REPORTS\CR-0694.FNL 7 <br />