SITE HISTORY - Laserfiche WebLink

Home Browse Search

2101 Webster Street 12th Floor Oakland, CA 04612 y (51 O) 663-4100 • FAX (510) 663-4141 Gr=OMATRIX December 21, 2000 Project 6628.000 Mr. Robert D. Mihalovich Chevron Environmental Management Company P.O. Box 6012 San Ramon, California 94583 Subject: Summary of Existing Data and Soil and Groundwater Sampling Work Plan 990 Beechnut Avenue Property Tracy, California Dear Mr. Mihalovich: Geomatrix Consultants, Inc., (Geomatrix), has prepared this Summary of Existing Data and Soil and Groundwater Sampling Work Plan on behalf of Chevron Environmental Management Company(CEMC) for the 990 Beechnut Avenue Property in Tracy, California (the Site; Figure 1). The purpose of this data summary and work plan is to investigate petroleum hydrocarbons that previously have been reported in the subsurface in preparation of the sale of the property. Previous investigations performed at the site indicate the presence of petroleum hydrocarbons in site soil. This work plan includes advancing twelve soil borings to a maximum depth of 25 feet below ground surface (bgs) and collecting soil samples to evaluate the lateral and vertical extent of petroleum hydrocarbon affected soil and assess the potential risk to human health, and collecting three grab groundwater samples to assess water quality within and downgradient of the affected soil. A brief summary of the existing data and the work plan for additional work are described below SITE BACKGROUND The site is bounded by Beechnut Avenue to the north, Forest Hills Drive on the east, and abuts a residential area(Alden Park) to the west and south. The Alden Park area was formerly used for petroleum storage. From the early 1900s to the mid-1960s, a crude-oil storage, pumping, and processing facility was located at the Renown Property, located to the east of the site (Figure 2). Pipelines connecting the Renown Property to facilities on the Alden Park Property may have been present in the southern portion of the site. In March 1985, petroleum hydrocarbons were reportedly observed on the Beechnut Avenue and Renown properties during grading activities for a residential development. Development activities were halted until environmental investigations could be conducted. Geomatrix Consultants, Inc. Engineers, Geologists, and Environmental Scientists