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1.0 INTRODUCTION/PREVIOUS WORK a ww 7 This report is being submitted in response to a request by the San Joaquin County Public Health Services, Environmental Health Division for a subsurface investigation of the lateral and vertical extent of soil and/or groundwater contamination at the H. J. Heinz facility, 757 E 11th Street in Tracy. The subject property is currently occupied by a food processing company (Figure 1 ) . On March 31, 1989, an underground diesel tank was removed from the site. Soil contamination was noted in the sidewalls of the excavation. Soil samples were collected from each wall of the pit. The laboratory results for the samples are included in Appendix I . In addition, groundwater was observed at a depth of 10 feet in the excavation. While the excavation was open, 1, 500 gallons of Oily water was removed from the pit by I.T. Corporation. Approximately 99% of the liquid was estimated to be water and 1t ( 15 gallons) was thought to be product. The oily water was transported by 1.T. Corporation to a refinery an Richmond for reprocessing. Due to the elevated concentrations of diesel constituents in the soils, combined with the presence of groundwater in the pit, the San Joaquin Local Health District required further assessment of soil and groundwater contamination at the site. The assessment was conducted in accordance with the workplan presented in our May 8, 1989 Preliminary Report. Background technical data from the Preliminary Report is summarized in the following section. On January 18, 1990, four soil borings (MW1, SB2, SB3 and SB4) were advanced to depths ranging from 7 to 19. 5 feet below grade for the purposes of site characterization and the installation of a groundwater monitoring well. Drilling was conducted by Osterberg and Stewart under C57 license y 446670 using a hollow stem auger drill rig. The well location is shown on Figure 2. Two of the soil borings were destroyed during the excavation in late September 1990. The third soil boring .located south of the excavation by about 10 feet is covered by soil pile 2. Soil boring and well completion data are included on the boring/well logs (Appendix II ) . Soil samples were collected from boreholes (SB-2, SB-3 and SB-4) near the top of the capillary fringe (@ 8 feet below grade) . A sample collected at a depth of 10 feet below grade in MW-1 was saturated and therefore was not submitted for laboratory analysis. The samples were analyzed for benzene, toluene, ethylbenzene, xylenes (BTX) and total petroleum hydrocarbons as diesel (TPH) using EPA 8020 and DOHS methods, respectively. Sample collection was �- handled in accordance with WaterWork' s Soil Sampling Protocol (Appendix III ) . B.C. Laboratories, a State certified facility, performed the analyses. The analytical _.. 1