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Subtask 1 Prefield There appears to be no need to perform any conventional prefeld activities because the ? permits will have already been acquired during Activity I, the health and safety plan will have been written,and the utilities will have been cleared. Subtask 2 Field Activities If necessary, the field activities will include drilling and installing a monitoring well that is screened across the present-day static water elevation.The location of the well will be f udeternned after consultation with PHS.The well will be drilled and installed using the same methods described in Activity I. The borehole will be continuously cored to 65 feet bgs. Soil samples will be screened in the field and samples will be submitted to a state certified laboratory as necessary.The borehole will be drilled to 65 feet bgs. The well will be constructed similarly to MW-11 as described in Activity I. Subtask 3 Laboratory Analysis Soil samples will be collected if field monitoring equipment indicate the potential for contamination. Laboratory analysis will consist of TPH as gasoline,BTEX, and MTBE. Subtask 4 Reporting Under this subtask, the findings of Activities II and III will be reported. This report will include field procedures, measurements, and observations,boring logs,and analytical results. Final Corrective Action Plan After the investigations described in this workplan are completed,Del Monte and R Parmaceast plan to update the Problem Assessment Report and Final Remediation Plan (CH2M HILL,April 1995)by issuing a Final Corrective Action Plan. As part of the Final Corrective Action Plan, a comprehensive documented receptor survey surrounding the Disco property will be conducted for the purpose of determining potential human health and ecological risks. This receptor survey will address exposure pathways including dermal, inhalation, and ingestion routes. Based on available information,a well survey will be prepared to include boring logs,screened intervals,current status, and pumping rates (past,present, and projected future rates and seasonal pumping patterns). In addition, hydrogeologic cross sections will be constructed from existing data and newly acquired data to show the lithological units and subsurface distribution of petroleum hydrocarbons in the soil and groundwater.Groundwater contour maps will be constructed to show the groundwater flow direction and gradient I F I f`