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f 12 February 1999 AGE-NC Project No. 98-0540 Page 2 of 8 Low concentrations of petroleum hydrocarbons were detected in soil samples collected from P 1 at depths of 35, 40 and 50 feet bsg. Analytical results of soil samples are attached. } 2.3. GROUND WATER DEPTH AND FLOW DIRECTION As stated in the Preliminary Site Assess nt Work Plan prepared by AGE, Groundwater depth in the area of the site is estimated to b 65 to 70•feet below ace grade,based upon the map Lines of Equal Depth to Ground Water in Wel s- pring ,prepared by the San Joaquin County Flood Control and Water Conservation District. Regional flow direction is northerly. I 3.0. SCOPE OF WORK Based upon analytical results of soil samples:collected from probe boring P1, the PHS-EHD will Based determination of the lateral and vertical extent of impacted soil prior to closure consideration AGE proposes to advance soil borings at the site to determine the lateral extent of petroleum hydrocarbon impact and determine if ground water has been affected. In addition to the former UST location, the investigation will include the advancement.of soil borings in the following areas, not sampled during the initial investigation: `. a An in-ground hydraulic lift located inside the garage area. • A two stage separator/clarifier located inside the garage area. The on-site domestic well will also be sampled for petroleum hydrocarbons. The scope of work will include the following tasks: i • Permitting and pre-field work activities; • Soil sample collection and analysis; h i e Grab ground water collection and analysis; • Completion of borings as ground water monitoring wells (if appropriate); and • Report preparation, 3.1. PERMITTING AND PRE-FIELD WORK ACTIVITIES Applicable site assessment permits will be obtained from the PHS-EHD. As required by PHS-EHD .. Advanced GeoEnvironmental,Inc. - i