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LM �..I LN CHAPTER 1 INTRODUCTION Le On February 6, 1987, ARCO Petroleum Products Company (ARCO) personnel met with San Joaquin County Local Health District (County) L' representatives. The County directed ARCO to conduct a groundwater investigation at ARCO Service Station 2093, located at 3425 Tracy Boulevard, Tracy, California. The location of ARCO Service L" Station 2093 is shown on Figure 1-1. Also shown on Figure 1-1 is the location of the nearest Tracy municipal well; the only municipal well in the map area. a. Past Investigations On December 5 , 1986 , American Environmental Management Corpora-- v tion (AEMC) removed one 500-gallon waste oil tank and sampled the underlying soil, under the supervision of County personnel. On December 17, 1986, AEMC removed additional soil from the excavation Lo and collected additional samples under County supervision. All soil samples were analyzed at California Department of Health Services (DHS) certified Eureka Laboratories, Inc. , in Sacramento. AEMC' s Lo January 12, 1987 , site investigation report, which includes the analytical results, is contained in Appendix A. On January 21, 1987, Brown and Caldwell (BC) personnel collected additional soil samples from the waste oil tank excavation. These samples were analyzed at BC's DHS--certified Emeryville laboratory. BC' s February 4, 1987, site investigation report, which includes the analytical results, is contained in Appendix A. Current Investigation On March 16, 1987 , the County approved BC' s March 2, 1987, work F plan to conduct investigative work. The work plan is contained in Appendix B. During April 1987 , BC conducted a site investigation at the station. The objectives of the investigation were to determine the L. groundwater gradient, identify product in soil and/or groundwater beneath the site, evaluate the site geology, and obtain information necessary for evaluating potential remedial actions at the site. The fieldwork was conducted as described in BC' s work plan. This report �' presents the methods used in, and the results of, the site + investigation. P Y BROWN AND CALDWELL I(N CONSULTING ENGINEERS 1.