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IMT-01-97 17:00 from:l.T. CORPORATION 5182282501 T-820 P.02 Job-665 <br /> %Nor %"64 <br /> Mass Ralauce Calculation <br /> (working Copy) <br /> 1.0 Introduction <br /> A mass balance calculation was performed to estimate the volume of total petroleum <br /> hydrocarbons (TPH) as diesel in sail treated versus the volume of TPH as dienet in soil <br /> remaining at the Lipton (formerly Van don Bergh Foods Company) facility. In May 1986, <br /> three underground storage tames (USTs) were removed from a common excavation. <br /> Subsequent invcstigations resulted in the determination that TPH as diesel was the <br /> contaminant of concern at the site. In May 1995, interim corrective action activities resulted <br /> in the excavation and disposal of approximatcly 330 cubic yards of TPH as diesel impacted <br /> soil from the source area. <br /> To perform the mass balance calculation tt following assumptions were made. <br /> ■ The voluTne of soil treated assumes that the gift source removal took place <br /> during the interim corrective action. There was no consideration of natural <br /> degradation of diesel that would have occurred since May 1986, when the <br /> U$Ts were initially removed, <br /> ■ Based on the geology at the site, the soil density was assumed to be 1.5 Elcins <br /> or 93.642 lb&. This density corresponds to a silty soil. <br /> • The diesel density was assumed to be 0.9 g/cm3. <br /> + Nem.-detect values repartee/ for TPH as diesel were assumed to have a value of <br /> 0.5 mg/kg, corresponding to one-half of the typical detection limit of TPH as <br /> diesel in soil (1 mg/kg)- <br /> 2.0 <br /> g/kg).2A Method of Calculation <br /> rRe treated mass of diesel in soil was initially calculated. Secondly, the mzidual mass of <br /> diesel in soil was calculated. Based on the results, the percentage of diesel mass tmated was <br /> calculated. <br /> 2.I Treated At= of Diesel In Soil <br /> The mass of diesel treated was calculated by multiplying the volume of soil excavated by the <br /> average TPH as diesel concentration measured in the excavated soil.. Approximately 330 <br /> cubic yards (8,910 le) of diesel impacted soil was excavated and dispuscd of during the <br /> intim corrective action implemented in May 1985. The average TPH as diesel <br /> concentration in the excavated soil was 2,975 mg/kg, This corresponded to a treated mass of <br /> 2,482 lbs of TPH as diesel. Table 1 provides the detailed calculations performed. <br /> M7JoS-0i-47N13dP19?-d4Qd jll 1 <br />