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GE®MATRIX
<br /> Mr. Robert D. Mihalovich
<br /> Chevron Environmental Management Company
<br /> December 21, 2000
<br /> Page 2
<br /> SUMMARY OF EXISTING DATA
<br /> The following summary of existing data is based on data presented in the reports and
<br /> memorandums listed below.
<br /> American Environmental Management Corporation, 1986, "Soil Excavation and
<br /> Disposal Plan, Tennis Villa Tract#1766, Renown Enterprises, Inc., Tracy,
<br /> California,"August.
<br /> Dames & Moore, 1987, "Review of Soil Boring and Groundwater Chemical Test
<br /> Data, Renown Enterprises Site, Corner of Tracy Boulevard and Beechnut Avenue,
<br /> Tracy, California," September 10.
<br /> Dames & Moore, 1989, "Phase II, Groundwater Investigation, Renown Enterprises
<br /> Property, Tracy, California,"March 3.
<br /> Dames &Moore, 1997, "Data Summary, Renown Property, Tracy, California,"
<br /> March 25.
<br /> Geomatrix Consultants, Inc., 1997, "Results of Limited Soil Assessment, Chevron
<br /> Property at 990 Beechnut Avenue, Assessors Parcel Number 234-070-02, Tracy,
<br /> California,"February 13.
<br /> Memorandum from Mr. Sheldon N. Nelson to Ms. Miriam Barbonio, "Renown
<br /> Enterprises Property, Tracy, California,"June 5, 2000.
<br /> Investigations conducted by others between September 1979 and August 1996 included 21
<br /> soil borings and three test pits. However, chemical data are only available from five of the
<br /> borings and the three test pits. Historical boring and test pit locations are shown on Figure 2.
<br /> In September 1979, Terrasearch, Inc., advanced two borings on the site (T-10 and T-17); no
<br /> data were available from these borings. Groundwater Technology advanced eight additional
<br /> soil borings (T-1 through T-8) on the site in November 1985, however, according to Dames &
<br /> Moore (1987), no soil samples were submitted for chemical analysis. One of the boring logs
<br /> (T-4) noted oily soil between the interval of about 2 to 11 feet bgs. To further assess the
<br /> extent of affected soil and groundwater at the adjacent Renown Property, Dames and Moore
<br /> advanced three test pits (P-18 through P-20) and three soil borings (B-1 through B-3) on the
<br /> Beechnut property in August 1988 and analyzed soil samples from the test pits and borings
<br /> for total petroleum hydrocarbons (TPH) quantified as oil and grease (TPHog). One sample
<br /> also was analyzed for TPH quantified as gasoline (TPHg), TPH quantified as diesel (TPHd),
<br /> and TPH quantified as kerosene (TPHk). In May 1989, Dames and Moore advanced five
<br /> shallow borings at the site (G-6 through G-9 and G-18). These borings were likely advanced
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