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12 February 2002 <br /> AGE-NC Project No 97-0312 , <br /> Page 9 of=18 <br /> performed to provide data for feasibility analysis of the remediation method and for proper design <br /> of the remediation system The ozone sparge pilot test specifications are presented in Section 4 9 <br /> r <br /> 310 SOIL REMOVAL AND DISPOSAL <br /> rAGE will evaluate the feasibility of excavation as a remediation alternative for site remediation,no <br /> additional field work is anticipated for the evaluation AGE may propose to excavate and dispose <br /> of petroluem hydrocarbon-impacted soil from the site Due to space limitations and the nature of <br /> operations at the site, on-site treatment Is not considered a feasible remediation alternative <br /> The proposed area of excavation is based on the analytical results for soil samples collected from <br /> a number of borings advanced at the site during previous investigations (Tables 1,2, 3 and 4) and is <br /> illustrated in Figures 6 through 12 <br /> Soil removal activities will consist of excavating and stockpiling both potentially uncontaminated <br /> shallow subsurface soil and petroleum-impacted soil at the site The proposed area for soil <br /> excavation is shown on Figures 6 through 12 Based on the findings of the previous investigations, <br /> impacted soil appears to extend to depths as great as 80 feet bsg Due to safety issues and the <br /> practical limits of excavation,onlythe top 20 to 25 feet are proposed to be excavated However,this <br /> should remove approximately 80%of the contaminant mass in soil from the site During excavation <br /> activities, excavated soil will be screened for volatile organic compounds using an OVM equipped <br /> with photo-ionization detector(PID) and an OVM equipped with a flame Ionization detector(FID) <br /> to screen for longer-chain hydrocarbons Excavated soil will be segregated into either "clean" or <br /> r impacted soil stockpiles Excavated soil that appears visibly stained,has a petroleum hydrocarbon <br /> odor, or OVM readings above background readings will be considered impacted <br /> rBased on the distribution of impacted soil, AGE anticipates that approximately 1,500 cubic yards <br /> I <br /> f soil (750 cubic yards of petroleum-impacted soil)would be excavated and stockpiled at the site <br /> Approximatelyl,250 tons of impacted soil would be transported for off-site disposal <br /> ` I <br /> I3 11 REPORT PREPARATION <br /> Upon completion of field work and receipt of final laboratory,analysis, a report will be prepared <br /> Ipresenting the findings of the investigation The report will Include a description,of the work <br /> performed , and the ,,results of the sampling and analysis Conclusions and applicable <br /> recommendations will be included in the report The report will be in a format acceptable to the <br /> IRWQCB and the EHD, and will be reviewed and signed by a California Registered Geologist <br /> • <br /> IAdvanced GeoEnvironmental,Inc <br /> I w � <br />