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Beacon Station No 3641 September 9, 2002 Stockton,California Work Plan ` In the interim prior to completion of the delineation phase and completion of a final • corrective action plan, Horizon proposes to initiate soil vapor extraction for remediation of the impacted vadose zone As indicated by previously completed remedial testing, soil vapor extraction has been shown effective in removing vadose zone hydrocarbons from the site subsurface Interim soil remediation would reduce the threat to off-site sensitive groundwater receptors and would likely reduce the final cost for remediation Additional groundwater delineation and interim soil remediation work phases are also described below Delineation Phase The delineation phase shall utilize cone-penetrometer (CPT) equipment to facilitate collection of soil, groundwater and stratigraphic data Data from this phase shall be used to site additional groundwater monitoring wells Task 1 Attempt to obtain an off-site access agreement from the property owner(s) to the west of the site, select and schedule drilling contractor, obtain well permits from the SJCEHD, prepare a site-specific safety plan, notify Underground Service Alert (USA) Task 2 Advance CPT borings at five locations (CPT-1 through CPT-5) as shown on Figure 3 The borings shall facilitate the evaluation of the vertical and lateral extent of petroleum hydrocarbon impacts to soil and groundwater, and site stratigraphy Boring CPT-1 shall be advanced to a depth of approximately 100 feet below surface grade with the CPT tool to evaluate the vertical succession of soil types and water-bearing zones from approximately 5 feet bsg to the total depth of the CPT boring The boring shall be backfilled with an appropriate material The stratigraphic data collected from boring CPT-1 shall be used to • 641 wp9-02 Project No 1641 15 4 HORIZON ENVIRONMENTAL INC.