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saewe��. _ 11 SECTION 1 INTRODUCTION This document is a Site Assessment Report of the Safeway Meat Packing Facility located at 1111 Navy Drive, Stockton, San Joaquin County, California(Figure 1-1). it is submitted by ERM-West, Inc. on behalf of Safeway Inc. (Safeway) to the Envir.nmental Health Division of the San Joaquin County Public Health Services (County). The objective of this assessment was to identify whether hydrocarbons from former USTs on the Safeway property have migrated off site. Site Rackg and The Safeway Meat Packing Facility maintains an on-site electric generator to protect their refrigeration requirements in case of power failure. The generator operates on diesel fuel which was stored in four 12,000-gallon underground tanks (Figure 1-2). The tanks were tied down to a 13-inch thick concrete slab at a depth of 13.5 feet below grade. Following failure of one of the tanks to pass the annual precision testing, an investigation was initiated in April 1987 by Weiss Associates (WA) to determine if diesel fuel had escaped into the surrounding subsoil. A second investigation was performed by Western Geologic Resources, Inc. (WGR) in September and October 1989. Results of these investigations are discussed below. Results of Previous Investigations Weiss Associates. On April 7 and 8, 1987, WA supervised the drilling of nine soil borings (B-1 through B-9) around the four tanks (Figure 1-3). Soil samples were collected from eight of the nine borings. These samples were analyzed for Total Petroleum Hydrocarbons - (TPH) and benzene, toluene, and total xylenes (BTX). One soil sample (B-2), collected from 20.7 feet below grade, contained petroleum hydrocarbons at 1,100 ppm. No other soil samples had any detectable concentrations of TPH and no soil samples contained any detectable concentrations of B7TX. Between June 6 and 10, 1987, the four underground tanks were removed by Precision Instruments of Stockton. Water was 1-1 r3