Laserfiche WebLink
A soil density of 100 lb/ft3 was assumed in calculating the mass estimates to reflect the silt <br /> and clay soil types present on site The calculations assume that residual TPH/BTEX <br />' concentrations in inaccessible (and therefore unremediated) areas are comparable to those <br /> in areas that were excavated This assumption is believed to provide a reasonable <br />' estimate of pre-excavation average concentrations <br /> The results of these calculations are summarized in the table below <br />' Surface Volume Total Mass Total Average <br /> Location Excavation Stage Constituent Area(fP) (ft3) ON Conc (ppm) % Reduction <br /> Site#1 Pre-Excavation TPH 1397 11176 752 6732 <br />' BTEX 1397 11176 507 454 <br /> Post-Excavation TPH 172 333 224 6732 970% <br />' BTEX 178 362 16 454 968% <br /> Site#2 Pre-Excavation TPH 3567 39237 1550 3950 <br />' BTEX 3567 39237 901 230 <br /> Post-Excavation TPH 1124 8402 332 3950 79% <br /> BTEX 1268 10540 242 230 73% <br /> As can be seen in the table, the percent reduction at both Sites #1 and #2 is significant <br /> TPH/BTEX has been almost entirely removed from Site #1, as soil excavation has <br /> removed majority of the impacted soil and negligible levels of residual chemical mass are <br /> present underneath the former warehouse structure The removal of TPH/BTEX from <br /> Site #2 is not as complete because of the remaining chemical mass underneath the former <br /> warehouse structure where excavation was not possible at the time of remediation The <br /> Iconfirmation and post-excavation samples collected from the portion of Site #2 where <br /> excavation was performed were either none detect or at low concentrations <br /> r <br /> C-2 <br />