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1 Preliminary Investigation and Evaluation Report-- California Cedar Products Stockton, California (Figure 1-Location Map) The Site is at an approximate ' elevation of 5 feet above Mean Sea Level (MSL) and has relatively flat topography sloping gently toward the west (USGS, 1980) The Port of Stockton/San Joaquin ' River is the nearest water body located 0 5 mile north of the Site Groundwater flow direction in the upper saturated zone (Quaternary-age alluvium) is generally in the ' south to southeast direction ' On 2 November 1990, Falcon Energy Associates removed two 12,000-gallon diesel tanks from Tank Pit No 1 at the subject Site Figure 2 — Tank Sample Map ' illustrates the former UST location and the findings of the laboratory analysis Sal samples were collected and tested by Water Work Corp IRESNA Industries, and ' reported to Falcon Energy on 26 November 1990 Sequoia Analytical reported the ' soil as non-detect (ND) for high boiling point hydrocarbons (diesel) with the exception of one sample reported at 5,000 mg/Kg collected at a depth of 13 4 feet below ground surface (bgs) from the west end (fill point end) of Tank No 2 According to Water Work Corp IRESNA, "the tank is tar wrapped and has no visible ' holes or pitting The overall condition of the tank is excellent " Groundwater was not encountered during the excavation of the tanks 1.3 Scope of Work Based on the approved work plan dated 3 September 2002, RAB Consulting was ' authorized by the PHS-EHD to perform the subsurface site investigation RAB Consulting performed the following scope of work for this site investigation r * Installed four exploratory probes (B1, B2, B3 and B4), • Installed Hydropunch at B4, • Collected soil and groundwater samples and submitted the samples for ' analytical testing for Total Petroleum Hydrocarbons as diesel (TPH-d), for RAB Consulting