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(bgs) and is sealed from 0 to 100 feet bgs Other available records indicate that most water wells in this area are completed below 125 feet due to seasonal water fluctuations and the lack of sufficient aquifers above that depth Non-impacted monitonng wells (MW-8, MW-9, MW-10, and MW-12) are located between the Compass site and the downgradient domestic water wells 3.0 Determination of Applicable Cleanup Levels Based on the sensitive receptor survey conducted in April 2002, the Former Canteen Facility hes within an area of current beneficial use Cleanup levels for the impacted soil will follow the EPA Region 9 Preliminary Remediation Goals (PRGs) Cleanup levels for groundwater will follow the California Department of Health Services Drinking Water Standard Maximum IContaminant Levels (CAMCL) Remedial alternatives to achieve these numerical objectives are discussed below I4.0 Feasibility Study and Workplan 4.1 Remediation Technologies Evaluation One of the objectives of the CAP is to assess various remediation technologies for applicability to the specific site conditions at the Canteen Facility Based on the site assessment results, fremediation of both soils and groundwater is required Residual soil impacts were identified in the former UST tank pit excavation area The extent of the groundwater impact is generally on- site The groundwater plume extends from the former UST tank pit area (MW-13 well series) to just downgradient of the MW-3 well series The remediation options listed below were evaluated according to their performance, reliability, and applicability to the site-specific conditions Excavation The source of the release was a 10,000-gallon UST, removed in March of 1992 Impacted soils were excavated to a depth of about 19 5 feet bgs and properly transported and disposed of off- site in November 1992 Approximately 36 cubic yards of soil were transported to Forward Inc Landfill The former tank hold was backfilled with clean imported fill Further excavation of the site is not feasible due to the depth of the impacted soils and the lack of space on-site for utilizing heavy equipment during excavation and stockpiling of soils On-Site Soil Aeration On-site soil aeration would require excavation of impacted soils and placement of cells and equipment for soil aeration As discussed under the Excavation Option above, further excavation of the site is not feasible due to the depth of the impacted soils and the lack of space on-site for utilizing heavy equipment during excavation In addition, there is a lack of space on-site for placement of the treatment cells and equipment required for soil aeration IN"• 0 4 4 ® �� �V G�CES~