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' Problem Assessment Report <br />for Soil and Groundwater Contamination <br />Comgan Property (Project No W0UI 00) <br />be plumbed to a carbon filter unit to adsorb the contaminants or some other off gas treatment <br />' technology prior to being emitted to the atmosphere Tight soil types such as the silts and clays <br />at this site are not as conducive to venting as sandy soils Additionally, lower volatility <br />' hydrocarbon fractions (TPHD) are generally not amenable to vapor extraction For these <br />reasons soil venting is not considered feasible. <br />In terms of protection of public health and water quality the alternatives are essentially <br />equivalent since the contamination has been demonstrated to be of limited extent and <br />environmental mobility The excavation and treatment/disposal option is the most feasible, <br />' easily implemented and cost effective <br />8.0 SOIL CONTAMINATION WORKPLAN <br />To prevent the remaining impacted soil from acting as potential source of groundwater <br />degradation RESNA proposes the following scope of work. <br />Excavation <br />Suspected hydrocarbon impacted soils will be excavated by licensed California contractor, <br />employing a backhoe tractor to perform the excavation RESNA, California Contractor No. <br />629796 will act as primary contractor <br />Excavated soils will be field screened by employing a photo ionization detection (PID) meter, <br />calibrated to a isobutylene standard. Clean soils will be stockpiled separately from the impacted <br />soils based upon field observations, i e , odor, discoloration, PID readings <br />Hydrocarbon impacted soils will be covered and underlain by 6 mil plastic sheeting pending <br />results of laboratory analysis for the determination of the appropriate remediation/disposal <br />method. <br />PAR -0393 FNL 8 <br />