Laserfiche WebLink
16 environmental mobility The excavation and treatment/disposal option is the most feasible, <br /> 1 easily implemented and cost effective. <br />' 7.4 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 a licensed California contractor, <br />' employing a backhoe tractor or tracked excavator <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 /> During the excavation process, the pit will be dewatered if necessary by pumping groundwater <br /> which flows into the pit to a portable Baker Tank on-site Purged groundwater will be sampled <br />' for BTEX, TPHG, and TPHD and stored on-site pending determination of appropriate disposal <br /> Disposal options may include transportation to a licensed disposal facility or on-site treatment <br /> iby carbon or bioremediation with subsequent disposal to the city sewer system <br /> Following excavation, it is anticipated a total of four verification soil samples will be collected <br /> from the excavation pit One sample will be collected from each sidewall of the excavation at <br /> rthe groundwater interface zone The exact location of samples will be determined in the field <br /> under the regulatory guidance of PHS/EHD <br /> PAR 0593 FNL 6 <br />