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r August 8, 1994- Page 994 Page 2 PROPOSED SCOPE OF WORK Exploratory Test Pits In order to delineate the lateral extent of hydrocarbon-impacted soils, PACIFIC proposes the excavation of approximately twelve exploratory test pits in the locations indicated on Figure 1. If required by field conditions, PACIFIC may excavate additional test pits. Field activities are tentatively scheduled to begin by August 25, 1994. The San Joaquin County Public Health Services Department- Environmental Health Division (SJCHSD) will be notified 48 hours prior to the start of field activities. The work will be accomplished using a backhoe operated by a licensed contractor. (Paradiso Construction Company). The exploratory excavations are anticipated to be approximately 18-inches wide,'5-feet long, apd 7-feet deep (or to the depth of . first-encountered groundwater). Soils exposed in the test pits will be logged by a PACIFIC geologist in accordance with the unified soil classification system; to provide further subsurface characterization. Soil and groundwater samples will be collected from the exploratory excavations and preserved for chemical analysis. Field and laboratory analytical procedures to be used during this investigation are presented as Attachment A. Upon completion of sampling activities, the test pits will be backfilled and compacted with native soils. Proposed Pilot Landfarming Program PACIFIC will stockpile approximately 1 cubic yard of soils from the test pits to evaluate the feasibility of landfarming the hydrocarbon-impacted soils. The soils will be placed within a visqueen-lined treatment cell located on site (Figure 1). For appropriate containment of the soil, the treatment cell will be constructed with berms around the perimeter. The soil samples will be collected for chemical anal- ysis and biological assessment to characterize the excavated soil, and to develop potential treatment and soil disposal strategies. The biological assessment will be performed by Unocal's Environmental Technologies Group, in Brea, California. Once the initial soil parameters have been established, the feasibility for land- farming (i.e., nutrient treatment and soil tilling)will be evaluated. REPORT A brief report documenting the results of the subsurface investigation will be prepared upon completion of the field work. 3100011BJWKPLN