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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 /> 1 <br /> 1 <br /> OWOI WREPORMCR-0694 FNL 7 <br /> 1 <br />