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Former Beacon Station No 12419 March 18,2002 ` Stockton, California Problem Assessment Report/Corrective Action Plan 12.0 PROPOSED CORRECTIVE ACTIONS It is Horizon's professional opinion that the most cost-effective and expeditious approach to site remediation would be concurrent operation of SVE and air sparging systems to reduce source area concentrations to the extent that will enhance plume stability and which will facilitate natural attenuation processes Operation of an SVE system would facilitate extraction of volatile gasoline constituents from the vadose zone and, with concurrent air sparging, dissolved gasoline constituents from groundwater Operation of VES and air sparge systems would also facilitate natural attenuation of fuel constituents by inducing flow of soil gases, including oxygen, into the impacted vadose zone The installation of an additional soil vapor extraction and air sparge wells should be considered after evaluation of the effectiveness of SVE and air sparging with existing installations The option of adding groundwater extraction in a staged approach to the remedial effort should be considered after evaluation of the effectiveness of SVE and air . sparging operations The proposed remediation will result in a mass reduction of petroleum hydrocarbons in the soil and groundwater plumes, increase plume stability, and facilitate natural attenuation processes These resultant conditions should increase protection of current beneficial uses of the groundwater resource and sensitive receptors beyond the current plume boundaries A brief period of post-remediation monitoring would demonstrate plume stability and progression of natural attenuation prior to closure 12 1 Recommended Corrective Action The recommended corrective action would involve operation of soil vapor extraction and air sparging systems Soil vapors would be extracted from vapor wells VW-1, VW-2 and possibly monitoring well MW-9 (screened interval 41 to 66 feet bsg) with cyclic air sparging to air sparge wells AS-1, AS-2 and AS-3 and possibly monitoring wells MW-1, MW-2 and 419PARCAP3-02 doc 26 PrQlect No 1419 23 HORIZON ENVIRONMENTAL INC.