ARCHIVED REPORTS_XR0004492 - Laserfiche WebLink

Home Browse Search

M ` 171.�1YG�tbtOp�O/IIIO Octobe 4 1995 Pie-4. . approximately 0 5 foot The estimated total volume of hydrocarbon impacted soil at the Di Salvo Lathrop site may be evaluated with the following equation, (1) V = m2H where V = volume of soil (ft) r= radius of estimate cylindrical area of impact (5 ft) H= height of estimate cylindrical area of impact (0 5 ft) The estimated volume of hydrocarbon-impacted soil is approximately 39 cubic feet (1 5 I cubic yards) Laboratory analyses of the soil sample collected at 15 5 feet bgs detected 6 2 pg/kg toluene and 10 0 gg/kg xylene The hydrocarbon-impacted soil consists of dense, poorly sorted, generally medium grained sand The estimated dry density of the hydrocarbon-impacted soil is approximately 45 4 kg/ft3 (Naval Facilities.Engineering Command, Soil Mechanics Manual, dated September, 1986) The estimated mass of hydrocarbon-impacted soil at the Di Salvo ' Lathrop site may be evaluated with the following equation, (2) M = VD where M = mass of estimated soil volume (kg) V = volume of soil (ft') D = dry density of soil (kg/ft) From equation (2), the estimated mass of impacted soil is 1,770 kg Assuming toluene and xylene concentrations detected m the soil sample collected at 15 5 feet bgs are homogeneously distributed throughout the estimated unpacted soil, the mass of toluene left in place is approximately 11 mg The mass of xylene left in place is approximately 18 mg CONCLUSIONS AND RECOMMENDATIONS ' No evidence of hydrocarbon contamination was detected at or above the laboratory reported detection limits m the confirmation groundwater sample collected from N1W1 on ' September 25, 1995 SJCPHS,EHD indicated in their letter dated September 22, 1995, that they will direct Df Salvo Truckmg to decommission MW1 under permit and inspection in the absence of hydrocarbons in the confirmation groundwater sample collected from MW 1 ' $� CONDOR