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L Beacon Station No 641 April 22, 1999 Stockton California Work Plan f i SCOPE OF WORK To evaluate the horizontal and vertical extent of gasoline-range hydrocarbons in the soil and groundwater beneath the site, Horizon proposes to perform the following scope of work Task 1 Obtain well permits from the SJC PHS/EHD, obtain an encroachment permit from the SDPW, obtain an offsite access agreement from the property owner(s) to the west of the site, prepare a site-specific safety plan, notify Underground Service Alert (USA), and schedule contractors Task 2 Utilizing a truck-mounted dnlling rig equipped with hollow-stem augers, drill five 8-inch diameter soil bonngs (13-3 and MW-6 through MW-9) at the locations shown on Figure 2 During advancement of the borings, soil samples will be collected with a California modified split-spoon sampler and subjectively analyzed using an organic vapor meter (OVM) at 5-foot intervals or less 2.1 The initial boring to be drilled, B-3, will be to evaluate the lateral definition of gasoline hydrocarbons detected in soil borings B-1 (wells VW-3 and VW-4) and B-2 (well MW-1) Gasoline-impacted soil had previously been delineated to less than 3 ppm (TPHg) in two consecutive 5-foot sample intervals in both borings B-1 and B-2 (Appendix B Table 1, as reported by Horizon on December S, 1997) If subjectively field-screened soil samples indicate possible gasoline hydrocarbon impact at 55 feet bsg, then boring B-3 will be advanced until subjective screening with the OVM indicates no hydrocarbon impact in two consecutive soil samples Upon completion, the boring will be abandoned by placing a bentonite/neat cement grout from the bottom of the boring to surface grade in one continuous operation The grout will be placed utilizing a tremie pipe or through the augers 1641-14 wp 4 HORIZON ENVIRONMENTAL INC