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i Central Valley Region(Regional Board) in May 1994, as amended to respond to Regional Board review comments and included the following;.those items which were completed are noted: + The installation of four new monitoring wells to.assess the extent of contaminants in the campground area. The collection of grab groundwater samples at two locations on the levee to assess the extent.of contaminants on the levee. • The installation of a free product recovery system (.completed May 1994). • Conducting slug tests. in the wells to estimate the hydraulic conductivity of the water.- bearing zone on the levee (completed June 1994). • Conducting a soil vapor extraction test on the levee.to evaluate the effectiveness of vapor r extraction on.the levee. • Dual phase extraction of soil vapor and.groundwater from the:levee with vapor emission. abatement as required by air regulations,and groundwater treatment via the on-site wastewater treatment plant, if feasible. r The majority of the planned activities discussed in the RAP were.not conducted since it was not possible, to obtain a permit from Reclamation District#548 (District). The levee has been'designated intrinsically unsafe by the Army Corps of Engineers. To resolve this :impasse, on.September 21, 1994, the Regional Board submitted a request for a revised work plan to define the extent of petroleum contamination and to evaluate remedial alternatives which.would not adversely affect the integrity,of the levee. 1.3 WORK PLAN OBJECTIVE The objective of this work plan is.to comply.with the recent Regional Board request and describe the planned activities that will be conducted at the Site to address the subsurface .petroleum hydrocarbon contamination at the Site. GASUSAMTOWERMWKPLAN 50114-001-01 1--2