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' Interim Emergency Remedial Action/Monitoring Well Installation Work Plan Page 3 Former Union Facility,-Cutter Lumber Project No 102 2 May 20, 1997 I ' 12 2 Proposed Scope of Work It is proposed in this Work Plan that ' • An emergency remedial excavation be completed with the intent of removing vadose zone hydrocarbon impacted soil interpreted to be a continuing mayor secondary source ' of hydrocarbon contamination of the groundwater, • A free product extraction well be constructed for the removal of liquid phase petroleum hydrocarbons floating on top of the groundwater surface beneath the tank ' pit, • Four additional borings be installed to be converted into 2 inch diameter groundwater monitoring wells, and ' • One year of quarterly groundwater monitoring be conducted including monthly measurements of groundwater depth Included in this on a semi-annual basis, will be the monitoring of the two remaining groundwater monitoring wells associated with ' the 1989 tank release on the southern end of the Property (Western Lift Site) Upon approval of this work plan by the LOP agency a detailed budget will be prepared ' and submitted to the State USTCFP for pre-approval of the expenditures Prior to commencement of field operations, a supplement to this Work Plan will be submitted to the LOP agency which will indicate the drilling and excavation contractors to be used along with more detailed excavation plans ' Note on Proposed Emergency Remedial Action Given the very clay-rich, and sand-poor nature of the soil, it seems very clear that vapor extraction or groundwater pump-and-treat would not be efficient or effective mechanisms ' to remediate the vadose zone secondary contamination in any reasonable length of time or at a reasonable cost Given the necessity of reducing the source as a first step in allowing bacterial degradation of the groundwater plume, the excavation and free product ' skimming were the only remedial options deemed feasible ' 2.0 INTERIM EMERGENCY REMEDIAL ACTION In order to remove the most significant part of the vadose zone source of groundwater ' gasoline contamination (i a gasoline impacted soil) it will be necessary to conduct a limited excavation in the immediate vicinity of the former gasoline tank We propose the following work to accomplish this goal 6I ' 2937 Veneman Ave, #6240 Geo-Phase Environmental Inc Phone (209) 569-0293 Modesto,CA 95356 Fax(209) 569-0295 I